VS Racing turbo upgrade suggestions for 5.3
11-18-2023, 09:31 PM
#41
OP the VS nex Gen stuff is real nice. I actually went down from the 78/75 to a 70/70 nex gen as I’m all street and want insta boost. The 70/70 nex gen has the same pre turbo BP as the gen 1 billet 78/75. 2.5:1 is a lot for a race car but not terrible for a street car. If you wanted get the next gen 78/75 .96ar and crank up the boost. It will give you an edge over the gen1 u got prob in spool, BP and boost would likely come in harder.
11-19-2023, 03:51 PM
#42
11 Second Club
iTrader: (43)
OP you'll notice that rel3rd is running 3.70s vs your 3.25s roughly 14% more torque at the wheels - something to consider. Rel3rd , been waiting to hear about an 8 all summer , sorry to hear that you hurt it . Can't remember if you are sbe or what fastners/gaskets you were running, Don't want to highjack this thread , are you going to post about the problem? Logging at the time ?
My 6.0 has a lot of good parts inside and has all ARP hardware, with studs on the heads, and GM (or better) gaskets throughout. Failure was 100% my fault, for playing around with 25# of boost without being done dialing the fuel/timing in yet. Rookie mistake, no doubt.
Honestly, after spending the money and time on the 85mm turbo, and Holley Terminator X Max, only to lift a head or two, it kinda took the wind out of my sail, as they say. I quit the local street car shootout series that I have been doing the last 6 or 7 years, and have been pit crewing for my son with his car. I have had the head gaskets all summer long, just waiting for me, but my job (lead mechanic for usps) hogs up 6 days of my week, and only day off don't really have me wanting to do mechanical work, if that makes sense. I may do a thread on it, once it's fixed, but ironically, I took it out Friday, running it as high as 23# of boost, and car never ran hotter than 187 degrees. Musta fixed itself, lol...
I'd stick with the current plan of a nice billet 7875 unit for now.
For a streetcar with a 4L80 that can down shift, it would serve you quite nicely in all areas.
As that turbo gets bigger and bigger, you start getting away from streetcar territory and into turbo lag and top end horsepower territory.
@rel3rd Do you think your merged hotside has something to do with spooling that 85?
I had a merged T4 on my last car with an old school T7875 from Turbonetics which probably wasn't the greatest but still made over 700whp but my current car is a divided T6 with an S484 and it comes online just as fast if not faster.
I really feel like there is some performance to be gained by going to a divided hotside, no real data, just seat of the pants feel.
Just my $.02
For a streetcar with a 4L80 that can down shift, it would serve you quite nicely in all areas.
As that turbo gets bigger and bigger, you start getting away from streetcar territory and into turbo lag and top end horsepower territory.
@rel3rd Do you think your merged hotside has something to do with spooling that 85?
I had a merged T4 on my last car with an old school T7875 from Turbonetics which probably wasn't the greatest but still made over 700whp but my current car is a divided T6 with an S484 and it comes online just as fast if not faster.
I really feel like there is some performance to be gained by going to a divided hotside, no real data, just seat of the pants feel.
Just my $.02
@rel3rd after moving fans around on radiator, it fit. I'll be damned 
The following 2 users liked this post by ScottStaypuff:
rel3rd (11-25-2023), The BallSS (11-27-2023)
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rel3rd (11-25-2023)
11-25-2023, 05:22 PM
#46
06-24-2024, 06:42 PM
#49
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Im building my fox now have question on your sons turbo Sorry for the delay guys. Email and laptop were messed up until today.
I've ran both Option 1 and Option 3 on my car, but started with 78/75 CAST wheel.
All were VSRacing versions FWIW.
My car is 2000 T/A, iron 6.0, 4L80E with 3000 stall triple disc, 3.70 geared 9" rear.
With me in it, car weighs 4160#. Run E85 from local convenience store, dual 450lph Walbros, 210# Bosch and all turbos asked about, I ran stock ECU, tuned with HPTuners, by me. Shifts made with factory ECU. IE; I launch in drive and never tough shifter.
My info below may not be exact, (but it'll be real close) as I am going by memory.
Feel free to search my name for exact details, ET's, etc.
~ T-4 Cast 78/75, .96a/r, 3" downpipe to open cutout by starter, 2-3# launch, 15# max
9.92@138, 3rd pass ever on combo
~ T-4 Billet NextGen 78/75, .96 a/r, 3" dp open cutout, 2-3# launch, 19# max
9.32@147 (5.9x@119 1/8th) using transbrake, 9.60's all day footbraking it.
~ T-4 Billet 80/82, 1.10 a/r, 4" into 3" downpipe w/open cutout, 2# launch (I never tried dialing in launch boost before track day)
9.35@149 with like a 1.6x sixty foot, lol.
On MY car, I had near zero lag with either 78/75, and using Turbosmart EBoost Street boost controller, could make 7-8# in less than 2 seconds.
Fast forward to early 2023, I swapped on a billet 85/88, and a Terminator X Max, and promptly threw 25# at it and lifted a head...still haven't fixed it.
It did go a 7.0 (1/8th) on the street with a 2# launch and 8# max though, so it still runs very well...even hurt.
Anyway...As said above, I'd also say turn it up, if fueling and tune is good enough to allow it. It'll make boost quicker all around.
BTW, I tried an OPEN, short 4" downpipe and car ran exactly the same as the 3" open cutout....
P.S.
My son (Bmore Fox) on YouTube has a Foxbody Mustang we converted to a 4.8 LS, Turbo 400, and an 80/82 VS turbo. He has zero issue making boost on that little engine. I can't share his numbers, as he does local no prep stuff, but he runs quite a bit better than my bests...
Skip to 11:00 for boost building on launch and a pretty sweet 1/8th mile run on the street
https://youtu.be/KOKuWne67-8?si=sm3lh4Jn2WzButJB
Hope this helps...
.
I've ran both Option 1 and Option 3 on my car, but started with 78/75 CAST wheel.
All were VSRacing versions FWIW.
My car is 2000 T/A, iron 6.0, 4L80E with 3000 stall triple disc, 3.70 geared 9" rear.
With me in it, car weighs 4160#. Run E85 from local convenience store, dual 450lph Walbros, 210# Bosch and all turbos asked about, I ran stock ECU, tuned with HPTuners, by me. Shifts made with factory ECU. IE; I launch in drive and never tough shifter.
My info below may not be exact, (but it'll be real close) as I am going by memory.
Feel free to search my name for exact details, ET's, etc.
~ T-4 Cast 78/75, .96a/r, 3" downpipe to open cutout by starter, 2-3# launch, 15# max
9.92@138, 3rd pass ever on combo
~ T-4 Billet NextGen 78/75, .96 a/r, 3" dp open cutout, 2-3# launch, 19# max
9.32@147 (5.9x@119 1/8th) using transbrake, 9.60's all day footbraking it.
~ T-4 Billet 80/82, 1.10 a/r, 4" into 3" downpipe w/open cutout, 2# launch (I never tried dialing in launch boost before track day)
9.35@149 with like a 1.6x sixty foot, lol.
On MY car, I had near zero lag with either 78/75, and using Turbosmart EBoost Street boost controller, could make 7-8# in less than 2 seconds.
Fast forward to early 2023, I swapped on a billet 85/88, and a Terminator X Max, and promptly threw 25# at it and lifted a head...still haven't fixed it.
It did go a 7.0 (1/8th) on the street with a 2# launch and 8# max though, so it still runs very well...even hurt.
Anyway...As said above, I'd also say turn it up, if fueling and tune is good enough to allow it. It'll make boost quicker all around.
BTW, I tried an OPEN, short 4" downpipe and car ran exactly the same as the 3" open cutout....
P.S.
My son (Bmore Fox) on YouTube has a Foxbody Mustang we converted to a 4.8 LS, Turbo 400, and an 80/82 VS turbo. He has zero issue making boost on that little engine. I can't share his numbers, as he does local no prep stuff, but he runs quite a bit better than my bests...
Skip to 11:00 for boost building on launch and a pretty sweet 1/8th mile run on the street
https://youtu.be/KOKuWne67-8?si=sm3lh4Jn2WzButJB
Hope this helps...
.
Last edited by Natedogfoxbody; 06-24-2024 at 06:48 PM.
06-25-2024, 01:44 PM
#51
https://turbo4less.com/product/vsr-8...ons-available/