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Billet 7875 Results thread I've done a ton of searching on here and haven't really found too many people posting their results with the VSR 7875. Was looking for people to chime in with their track results/Dyno/street encounters From mild 500rwhp set ups to maxing this thing out Let's see them Just got mine today to replace the 7668 https://cimg1.ibsrv.net/gimg/ls1tech...08d83a4a1a.jpg |
https://cimg7.ibsrv.net/gimg/ls1tech...593876c80f.jpg First pass ever with the combo in Colorado, 5500 d/a. Blew the map apart about 10' before the 1/8 stripe. 12# 12* |
So your results are only valid up til the 8th mile? What kind of horsepower are you putting down. My old na build ran high 7's in the mid 90's. |
Originally Posted by silvea
(Post 19709891)
So your results are only valid up til the 8th mile? What kind of horsepower are you putting down. My old na build ran high 7's in the mid 90's. |
Sucks you couldn't get more info on it |
I am interested in results also, as I was looking at that turbo for my present project-sort of a budget build (we know how that goes, lol) |
vs billit 78/75 ran 10.80 at 125 mph on 5.3 with ls9 cam in 4300 lb Silverado. 20 psi boost. |
I know it's not billet but I have an on3 7875 ran 10.70 @ 130 on 9 psi 3400lb camaro 6.0 blowthrough |
We're gonna try our damn hardest to go 150 at 2900 |
I'm planning on running mid 9s at 3300 pounds with a 5.3 and 4l80e. We will see if I reach my goal. |
Yeah with the glide and being light I don't see why we can't hit our goals Space was the limiting factor and I haven't seen any VSR 7875s go 150 yet, It may take a built 5.3 but were gonna try on the stock style parts first we got 10mph to make up |
I made 705/746 through a cammed 5.3 at 16lbs and 19* but with T7575. This was also through a 6 speed. Would think the two turbos are very similar in flow numbers. Ran 10.6 @ 133 with a slipping clutch. |
Looks like you had some room to grow there too if you wanted to turn it up! |
I was hoping this was going to be your results thread to get me to pull the trigger on swapping. |
Still waiting on a carb man as soon as we have some data we will update |
i'm really interested. based on the weight difference we are probably making similar power on a maxed out 7668 and 93 octane. mine has gone 6.5 @ 111 with the 4l80 and should go around 10.0 @ 138 @ 3600# (previous best with the manual was 6.7 @ 107 and 10.3 @ 136) I dont see me doing much quarter mile but i'd like to approach a 6.0 @ 115 and break 145 mph if i ran it all the way out. it would be nice to get this turbo vs the huron speed one and save $150 |
Honestly if you're trapping 111 at 3600 you're make a ton more than me that's about a 800 pound difference with only 1 mph That On 93?? |
be carefull pushing those turbos on 93 at the levels you are pushing they are pumping a ton of heat. my buddys Camaro has ran 6.05 at 114 and 9.44 at 141 mph on a cast on3 78/75 @3550 lbs E85 . engine is a 5.3 with isky triple 12 cam 400th and 3.73 gear with 31 by 13 slicks. we were noticing it getting iat pretty high at 20 psi boost around 175* so we swapped to his billit borg 80/83 t4 and no track runs yet but street testing has seen the iats under 150* and that's heat soaked without a cool down. I think the .96 housing is the limiting factor with all the 78/75 turbos. but for the money they cant be beat. good luck. |
Car is coming off 93 after this swap |
Originally Posted by Lawhead
(Post 19710736)
Honestly if you're trapping 111 at 3600 you're make a ton more than me that's about a 800 pound difference with only 1 mph That On 93?? |
Originally Posted by Tally TransAm
(Post 19710843)
yeah, however, on that pass i lost a fuel pump on the launch and was running lean enough to melt a cylinder head on the big end. car was probably making a little more power than my normal tune Solid run too for a heavy car LawHead in for some Great Results and your 150+ mph pass! |
We will see! Car gets a cage this week and Carb should be the following week Then we make some hits |
Originally Posted by Rudy72
(Post 19711520)
What brand and type of fuel pump, intank units? How many mile on that pump? Solid run too for a heavy car LawHead in for some Great Results and your 150+ mph pass! twin intank walbro 255's. no idea on miles, my car sits A LOT. pump was actually fine, a wire pulled out of a shitty fuse terminal on the launch. |
Carb should be here next week, as well as the cage should be going in so we should be making some progress next week and hopefully get some numbers Really surprised there isn't people out there pushing this turbo on E85 |
My billet 7875 is on its way from VSracing, will be putting it on my 4.8 fairmont in the coming weeks.... |
My billet 78/75 build thread starts about here..... https://ls1tech.com/forums/multimedi...s-vids-17.html |
I wonder how much more power can be expected from these t4 .96 housings with the 75mm turbine? I know PTE has CEA turbine wheels that would help flow, but I'm hoping to see someone offer a larger turbine wheel and/or housing that keeps these small frame turbos still flowing on larger engines and higher power levels. |
Originally Posted by slowride
(Post 19715782)
I wonder how much more power can be expected from these t4 .96 housings with the 75mm turbine? I know PTE has CEA turbine wheels that would help flow, but I'm hoping to see someone offer a larger turbine wheel and/or housing that keeps these small frame turbos still flowing on larger engines and higher power levels. I thought I saw they had a 7885 or like a 7892 or are those mid-frame turbos? |
Carb shows Thursday so let's hope next weekend we swap turbos and get to tuning |
Should be getting the car back this weekend from the Cage Install Storm down here in Florida put a hold on things Picked up an Aluminum 5.3 as well which will have 243 heads and will be doing all the normal things people do to them to help them live should help make a little more power and take away some weight that was added from the cage |
Should be getting the turbo on the car this weekend if Florida wants to play nice with the rain got the car back from getting a cage and got the E85 carb Also have an Aluminum Gen 4 motor on the way were gonna do all the "tricks" too to make it last and see how far we can push this thing Soon! |
Waiting for results ! |
If this rain wasn't hampering things it would have been on yesterday and would have had the car back together but don't have the luxury of a place inside to actually work on the car so until we get some better weather I'll be back to the waiting game |
Cast 7875 here, 11.05 @137. Full weight f body, makes 745/1042 through a th400. |
10.80 at 130 mph at 4400 lbs l33 with ls9 cam 400th 2003 Silverado. vsr billit 78/75 20 psi |
No hard numbers but I finally got some seat time in mine, holy muther on just the 7lb wg spring this bitch goes sideways at 80. So much fun. Once I get it all dialed in i will report back. |
What wastegate and bov are you guys running with this turbo ? I have the Huron speed truck manifold kit that accepts up to a 44mm wg and 50mm bov. I'm looking for suggestions . I like the numbers you guys are running in those heavier vehicles. |
Originally Posted by Game ova
(Post 19740661)
Cast 7875 here, 11.05 @137. Full weight f body, makes 745/1042 through a th400. I feel like watching that run would be like watching John force line up. 1000+ torque and only an 11 flat? Thing has a lot more potential time wise. |
Originally Posted by The BallSS
(Post 19715896)
Doesn't Comp Turbo have a larger turbine? I thought I saw they had a 7885 or like a 7892 or are those mid-frame turbos? |
Be interesting to see S475 vs 7875 on the same set up |
Originally Posted by cam
(Post 19741342)
Be interesting to see S475 vs 7875 on the same set up |
Originally Posted by silvea
(Post 19741242)
I feel like watching that run would be like watching John force line up. 1000+ torque and only an 11 flat? Thing has a lot more potential time wise. |
Originally Posted by hfthe3rd
(Post 19740789)
What wastegate and bov are you guys running with this turbo ? I have the Huron speed truck manifold kit that accepts up to a 44mm wg and 50mm bov. I'm looking for suggestions . I like the numbers you guys are running in those heavier vehicles. |
I bought a Huron Speed 7875 that I am going to install once i get the engine back together and was also wondering if anyone else had results for the Billet 7875s. |
i went 10.99 & 133spinning on 19psi 3800lb truck, 4.8 with a 224/228 mid .5xx lift cam, 4l80e and a 10.5 afr, pump 92. there is a lot more left in it obviously, but traction and power control issues kept me from leaving harder than a 2.xx sixty hopefully next year I can get the sixty down to a respectable 1.60' and run half track passes since I dont have a bar/cage/etc.. |
Im confident the two cars i built in the last 6 months will perform well with the 78/75s. They light off quick and make boatloads of torque on the 5.3 engines. |
What cams are everybody using with the 7875s? |
Originally Posted by SLWRDE
(Post 19811514)
What cams are everybody using with the 7875s? |
Originally Posted by SLWRDE
(Post 19811514)
What cams are everybody using with the 7875s? with the small turbine it think it likes the -6* overlap range |
I am really considering the Triple 12 or the JFR 218/218 for my 5.3 and 7875. I haven't heard any complaints from these two cams with a setup like mine. |
is anybody running the btr stage 3 cam with the 78/75 ? curious how it does |
these are a good turbo but the 75 mm turbine and .96 housing are still a bit restrictive on a 5.3 at higher rpm. so to much cam will not help the top end just make it soggy down low. we did a test on my buddys backhalf Camaro . with a 2005 5.3 with triple 12 cam , 400th, 3.73 gear and 31.5 by 12 slick leaving at 12 psi and running 20.5 psi max it ran 9.40 at 141 mph with a cast on3 78/75. swapped to a borg 80mm with 83 mm turbine 76mm exducer and t4 1.25 housing it ran 9.31 at 142 mph all else being the same. spool was much slower due to borg being bigger heavier parts. but iat did drop about 25 degrees. I'm sure turning them up more we whould have seen a bigger difference but for the money a 78/75 is a good turbo. I'm not sure the bilit helps much as they already spool fast and I think the turbine wheel and housing are the limiting factors. |
Originally Posted by SLWRDE
(Post 19813074)
I am really considering the Triple 12 or the JFR 218/218 for my 5.3 and 7875. I haven't heard any complaints from these two cams with a setup like mine. |
I have the 8475 on my 5.3. I hope it puts out some nut. Im putting it on a dyno this year..we will see. |
Freeky, When I called BTR awhile back and told them my setup/goals which is a 5.3 and a HSP 78/75 with a goal of 600-700hp they said the Stage 1 222/227 .602"/.598" 113+3 would work the best. I would imagine with that BTR Stage 3 cam 230/235 .609"/.610" 114+4 it would depend on your setup and how much power you want. |
Originally Posted by SLWRDE
(Post 19811514)
What cams are everybody using with the 7875s? |
Well I talked to Jarret (Stock48) last night for almost an hour about my setup (5.3, HSP 7875 in a 1965 Cutlass) and what cam he thinks I should use. Wow, what a great guy who is a wealth of knowledge. So we decided on a 218/222 .585 112 LSA. Man I can't wait to get this thing installed. Thanks everyone who recommended him. I will post results once I get everything back together. |
Take it for what its worth, but I have designed a handful of cam lobes as a mechanical engineer and spec cams regularly for customers. For a 243 headed forged 5.3 (~9.5:1 CR) with a turbonetics BB 7875 cast turbo, I ran a lot of numbers as I always do, and what I landed on was 219/226.5 @ 0.050 with 115 LSA and placed my ICL at 110. My lift is right around 0.600 +/- 0.005 for each lobe. The result is an earlier exhaust valve opening (54.5 BBDC) to start the blow down process sooner due to high back pressure from the 75mm 0.96 turbine assembly. This helps reduce pumping losses through the exhaust side and starts spooling the turbo sooner. Additionally, this results in -6 degrees overlap which is needed with high exhaust back pressure setups. And my intake valve close occurs at 38.5 ABDC which gives a nice dynamic CR and good bottom end torque and turbo spool. Hope that helps someone :) -John Roastin Performance |
haha thats some cognitive resonance for me. i took every cam i could find recommended for the 7875 and plugged it into the cam motion cam timer. very little variation on that theme of -6* overlap. most were within a degree or two. |
Has anybody maxed out one of the Huron billet 7875's yet? |
98 Camaro LQ4 6.0 huron speed v1 kit 7875 turbo LJMS stage 2 turbo cam 18 psi and 12* 80# Dekas springs and trunion upgrades stock bottom end on pump gas/meth https://cimg7.ibsrv.net/gimg/ls1tech...df39275099.jpg |
What is the advantage of the billet 7875 over the cast wheel 7875? Anyone swapped from one to the other? Is the billet worth the extra money? |
Originally Posted by Kfxguy
(Post 20003189)
What is the advantage of the billet 7875 over the cast wheel 7875? Anyone swapped from one to the other? Is the billet worth the extra money? my buddy had the cast on his heads/ boost cam 5.7l ls1 . He made 570 on 12# . In my opinion . The billet is was more efficient |
Originally Posted by Mavn
(Post 20004259)
I had the billet 7875 . Stock 4.8 no cam nothing . Stoxk 80e . I made 670 rwhp on 19# . my buddy had the cast on his heads/ boost cam 5.7l ls1 . He made 570 on 12# . In my opinion . The billet is was more efficient |
No dyno numbers, but i finally got this one running and tuned. With the Huron speed kit, and a 7lb spring it makes 11.5ish psi. It goes into positive boost at 2500rpms (which i thought was good) Pulls real nice as is, timing is between 17-19 on pump e70, afr is 11.2. |
Originally Posted by 01ssreda4
(Post 20004527)
No dyno numbers, but i finally got this one running and tuned. With the Huron speed kit, and a 7lb spring it makes 11.5ish psi. It goes into positive boost at 2500rpms (which i thought was good) Pulls real nice as is, timing is between 17-19 on pump e70, afr is 11.2. https://www.youtube.com/watch?v=EmnO8pPmXow |
Originally Posted by Mavn
(Post 20004590)
SBE ls1? https://ls1tech.com/forums/forced-in...-75-build.html |
Hope it was the converter, but that high gear sounds very suspect. |
Originally Posted by Game ova
(Post 20004611)
Hope it was the converter, but that high gear sounds very suspect. Let me clarify, the 80e tuning isn't/wasn't done there. I didn't tune the manual tables, I had it in 2nd coming over the hill, because i wasn't 100% throttle the fucker shifted to third before i moved the shifter. It's in a table in the tune I just haven't corrected it yet, if that's what you're referring to. |
Originally Posted by 01ssreda4
(Post 20004614)
do what? you lost me |
Edited my comment, you are correct |
I have a cast on3 78/75 and have gone 9.67@146 im my 3750~ weight Camaro on 20#’s locking my converter. |
4.8, BTR Stage 2, BTR springs, 7875 VS Billet, 4l80e w/HD kit, Circle D single unlocked, 8.8 w/3:73 gears, A2A, E85. 93 Mustang, 3400lbs with driver. Best run to date 10.30 @ 135 with a 1.6 60', 15psi 1rst and 2nd, 10psi 3rd to keep my speed at 135 or less (6pt no cage). Dyno soon to tune to 20psi. https://youtu.be/q7QwN61oFPE |
6.0 LQ4 7875, tick stg1 turbo cam, 317s, 3” down pipe with 3” cutout, t-56 car made 711/779 on 17 psi. 530/570 on 10 psi. It makes peak boost around 5,300 rpm and drops off after that. |
Originally Posted by BlkBird2000
(Post 20012690)
6.0 LQ4 7875, tick stg1 turbo cam, 317s, 3” down pipe with 3” cutout, t-56 car made 711/779 on 17 psi. 530/570 on 10 psi. It makes peak boost around 5,300 rpm and drops off after that. https://youtu.be/QN8B6BRMJ4U Nice numbers, I’m curious if you have it in 4th gear and nail the gas at what rpm does it start making boost? Is that the cast or Billet 7875? |
Originally Posted by 4EyedTurd1
(Post 20013155)
Nice numbers, I’m curious if you have it in 4th gear and nail the gas at what rpm does it start making boost? Is that the cast or Billet 7875? |
I ask BlkBird2000 since he has a 6.0 |
Originally Posted by 4EyedTurd1
(Post 20013292)
I ask BlkBird2000 since he has a 6.0 |
Well....go ahead and post it. |
Originally Posted by 4EyedTurd1
(Post 20013372)
Well....go ahead and post it. |
|
Originally Posted by Drj8787
(Post 20013679)
you better get gas lol 50mile range is only gonna get you a couple blocks like that 😂 |
I went 10.0@135 on a cast wheel 78/75, 6.0l, ss2 cam 3750 lbs,and I just finished up another build had a square port 6.0l, ss2, 4l80e unlocked do 645rwhp on 15lbs with a VS billet 78/75. |
Originally Posted by Turbo D
(Post 20013731)
I went 10.0@135 on a cast wheel 78/75, 6.0l, ss2 cam 3750 lbs,and I just finished up another build had a square port 6.0l, ss2, 4l80e unlocked do 645rwhp on 15lbs with a VS billet 78/75. https://youtu.be/BYNRDDtCnLY Love the "free hat" haha |
Originally Posted by Kfxguy
(Post 20013726)
yea I ended up picking up my grandmother one city over and then made it almost home and stopped and got some Did grandma like the whistling noises? You didn’t give her whiplash did ya, lol? |
LS3 stock bottom end + Ported heads and 235/231 cam + Precision 7675 = 817rwhp/758rwtq @ 16psi on 93 + meth |
Guys I’m swapping my cast 7875 for a billet 7875 right now. I have no Dyno numbers but I’m making only this change and I drive the car almost every day. So I will be able to tell you the difference I feel, if any. I’m really in tune to everything with the car. I feel that my butt dyno is pretty accurate to tell me if there’s a difference or not. I can give you guys my assessment if your interested. |
Ok here’s my take on it. 1) sounds total different. It has less of a whistle sound 2) it appears to spool faster. And it’s only a very little bit. If I had to put a time on it, I’d say it’s about a tenth of a second faster. it is a noticeable less lag. Not that I had much lag before. 3) midrange feels a bit stronger. I’d say about 50-60ftlbs more. 4) checking logs and videos and comparing, it’s .2 quicker from 60-115mph. 5) the blowoff valve is louder for some reason. |
Originally Posted by Kfxguy
(Post 20020361)
Ok here’s my take on it. 1) sounds total different. It has less of a whistle sound 2) it appears to spoil faster. And it’s only a very little bit. If I had to put a time on it, I’d say it’s about a tenth of a second faster. How do I know? Well I it is a noticeable less lag. Not that I had much lag before. 3) midrange feels a bit stronger. I’d say about 50-60ftlbs more. 4) checking logs and videos and comparing, it’s .2 quicker from 60-115mph. 5) the blowoff valve is louder for some reason. |
Originally Posted by Game ova
(Post 20020362)
I can buy the sound, and the spool time you mention. But I seriously doubt you're making that much, if any at all more torque. I went from a billet precision to the cast on3 and it made the same torque, I know this because I put it on the rollers. |
Originally Posted by Kfxguy
(Post 20020364)
i wont argue that, because it does spin the tires from a roll any differently. But the initial hit does feel stronger. Do I feel that it’s a huge difference? No. Im not sure if I think it’s worth the extra money. Im wondering if I should have skipped this unit and went to the on3 BMF 7675. |
Originally Posted by Game ova
(Post 20020365)
I can't cosign this, but I've read that the BMF lights off so fast that it makes rod bending torque. In other words, it spools almost too fast. Again, this is hearsay as I have no experience with the unit. so do you think it would be a bad idea? I do have a good boost controller that should keep it in check. |
Originally Posted by Kfxguy
(Post 20020366)
so do you think it would be a bad idea? I do have a good boost controller that should keep it in check. |
Ah man, I was hoping the spool noise was louder with the Billet lol... love my cast vs 78/75 spool sound. Viren said that the billet would only be worth about 8% increase in airflow at 11-14psi. It’s not till you get much higher 20+psi that you get the full 18% flow increase. |
Originally Posted by customblackbird
(Post 20021344)
Ah man, I was hoping the spool noise was louder with the Billet lol... love my cast vs 78/75 spool sound. Viren said that the billet would only be worth about 8% increase in airflow at 11-14psi. It’s not till you get much higher 20+psi that you get the full 18% flow increase. |
Instead of making you guys try the compare, I took screenshots to illustrate. First one is aboit 60mph. The cast one is on bottom and has the lead (had to time then just right) https://i.postimg.cc/7PGL2r4p/482242...9702-A6154.png the billet one has taken over https://i.postimg.cc/Rq5y3HmV/45-B37...-FA1-F18-B.png |
I understand and appreciate the effort to show the difference, but really, the dyno....or the track would have really been the way to show what each unit has to offer. Screenshots don't really get it done imo. |
Originally Posted by Game ova
(Post 20021363)
I understand and appreciate the effort to show the difference, but really, the dyno....or the track would have really been the way to show what each unit has to offer. Screenshots don't really get it done imo. |
Thanks kfx |
Originally Posted by 007FJ
(Post 20021376)
Thanks kfx welcome. |
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