VSR 7875: G2.5 vs NextGen?
VSR 7875: G2.5 vs NextGen? It's about time to pull the trigger on a turbo for my 6.0 swapped 2011 Crown Vic. Trans is 4L80E with a 3200 Circle D converter, 3.27 gears. What is the difference between the two following kits?
Package with Billet G2.5 1.25 T4
https://turbo4less.com/product/denma...-g2-5-1-25-t4/
Denmah Package with Next Gen 78mm T4 1.25
https://turbo4less.com/product/denma...-78mm-t4-1-25/
I see both are T4, 1.25 A/R, 4" downpipe outlet, both billet wheels. I am looking for great street driveability with fastest spool time on 93 pump gas with a possible future upgrade to E85/flex fuel. Looking to run 12-14psi approx. Tried contacting VSR directly but looks like they are at an event until next week.
Package with Billet G2.5 1.25 T4
https://turbo4less.com/product/denma...-g2-5-1-25-t4/
Denmah Package with Next Gen 78mm T4 1.25
https://turbo4less.com/product/denma...-78mm-t4-1-25/
I see both are T4, 1.25 A/R, 4" downpipe outlet, both billet wheels. I am looking for great street driveability with fastest spool time on 93 pump gas with a possible future upgrade to E85/flex fuel. Looking to run 12-14psi approx. Tried contacting VSR directly but looks like they are at an event until next week.
I have no issue running the cheaper turbo (in fact I would prefer it as this is a street car tire fryer with no ET goals) but those have a 3" downpipe outlet. If I ever get the itch to run more boost or grow my setup, then Next gen stuff is all 4" and I'd have to remake a portion of the exhaust which I am trying to avoid. I also want to run a boost activated cutout on the downpipe with a stock exhaust, so changing turbos down the road would require a bigger loudvalve, etc.
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There's like a 3-4% different in spool and power between those two turbos. Something that will almost never be noticed because of all of the other variables that go into how a turbo engine performs from one day to the next.
Although the V-band housing option is pretty nice...
Although the V-band housing option is pretty nice...
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I could be wrong but I think the 2.5 is the dual v band style housing , and FWIW a friend just got a cast 7875 kit from viren and it has the 9 blade turbine ( I'm guessing a little less back pressure vs the 10 blade) also has the 3" compressor outlet. OP for your goals the cast 7875 could easily do at 400 ish $. Someone on here went 9s @ 4000 lbs with a gen1 cast 7875 and 3" downpipe
I could be wrong but I think the 2.5 is the dual v band style housing , and FWIW a friend just got a cast 7875 kit from viren and it has the 9 blade turbine ( I'm guessing a little less back pressure vs the 10 blade) also has the 3" compressor outlet. OP for your goals the cast 7875 could easily do at 400 ish $. Someone on here went 9s @ 4000 lbs with a gen1 cast 7875 and 3" downpipe
It can be had with 3 or 4" exhaust, and .96 or (I think) 1.32? A/R
I originally had a CAST 78/75, with 3" exhaust turbine, 2.5" compressor outlet, .96 a/r
Car, a 6.0 liter , 4L80e, 9" rear, 2000 WS6, weighs 4060# with me in it.
On E-85 street tuned by me, 3000rpm transbrake launch, went 9.94@138 with 15# of boost
3" On3 downpipe with electric cutout just past the starter
Swapped to a NextGen Billet 78/75, still with 3" exhaust turbine, slightly bigger 3" compressor outlet, and same .96 a/r.
Same boost level of 15#, same tune, same transbrake launch, went 9.76@141.7
Swapped my 3" On3 intercooler for a 4.5" Treadstone and then wastegate placement wouldn't allow any boost control, so was making 22# and some dead tires, went 10.00@147, and a 9.88@146, footbraking and launching just off idle, lol.
My son has the GEN2.5 Billet 78/75 on his car, but no race or even drive time yet.
His is 4" exhaust, 3" compressor outlet, 4" inlet, NOT V bands (except on exhaust, obviously), but regular slip fit compressor outlet, just like both of mine...
FWIW, Viren told my son that, ALL ELSE BEING EQUAL, the NEXTGEN should make 50 MORE HP than the CAST version, and...
The GEN2.5 should make 50 MORE HP than the NEXTGEN (aka GEN2)...
Here's what WALLACE RACING Calculator says for a 9.94 (Cast 78/75 turbo)
Now, I'm not putting a whole lot of faith into the accuracy of their calculator, as far as it's HP numbers, but there is indeed a 40-70hp gain/difference from CAST to BILLET NextGen, depending on what numbers you go by and use to compare...
And here's what WALLACE RACING Calculator says for a 9.76 (Gen 2 aka NextGen Billet 78/75 turbo)
CAST 78/75
NEXTGEN BILLET 78/75
GEN2.5 78/75
Last edited by rel3rd; Jan 21, 2021 at 11:08 AM.
Thanks all for the input. Definitely a lot to chew on. No doubt that the billet versions of the turbo make great gains, but I am wondering if I will able to make the most of those gains since I don't plan to run past 12ish lbs to start with (93 pump only). That being said I bought the cast version since it's hard to argue with the cost, and fitment with the 3" downpipe. Down the road when I get hungry for more, I can try to convert to a flex fuel setup for E85 and maybe bump up the turbo size.
Thanks all for the input. Definitely a lot to chew on. No doubt that the billet versions of the turbo make great gains, but I am wondering if I will able to make the most of those gains since I don't plan to run past 12ish lbs to start with (93 pump only). That being said I bought the cast version since it's hard to argue with the cost, and fitment with the 3" downpipe. Down the road when I get hungry for more, I can try to convert to a flex fuel setup for E85 and maybe bump up the turbo size.
p.s. You 100% WILL get hungry for more, no matter turbo you have, or had, LOL.
When I did mine, an On3 kit, I "thought" I'd be happy with (& only wanted) a 500rwhp setup, so I stupidly chose their standard turbo option, a cast 70/65 that On3 claimed to be good to 600+ RWHP, instead of the (less than $200) optional 78/75. It made INSTANT Boost, but was out of breath by 5000 rpms or so. That cast 78/75 will happily run 12# of boost for as long as you want it to.
Good Luck!
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Joined: Mar 2013
Posts: 503
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Thanks all for the input. Definitely a lot to chew on. No doubt that the billet versions of the turbo make great gains, but I am wondering if I will able to make the most of those gains since I don't plan to run past 12ish lbs to start with (93 pump only). That being said I bought the cast version since it's hard to argue with the cost, and fitment with the 3" downpipe. Down the road when I get hungry for more, I can try to convert to a flex fuel setup for E85 and maybe bump up the turbo size.
https://ls1tech.com/forums/conversio...tor-build.html
I got sidelined with some trans issues but those are hopefully all set, so onto the fun stuff
TECH Enthusiast
Joined: Mar 2013
Posts: 503
Likes: 39
Ask and ye shall receive
https://ls1tech.com/forums/conversio...tor-build.html
I got sidelined with some trans issues but those are hopefully all set, so onto the fun stuff
https://ls1tech.com/forums/conversio...tor-build.html
I got sidelined with some trans issues but those are hopefully all set, so onto the fun stuff
Teching In
Joined: Aug 2019
Posts: 39
Likes: 18
From: Montana
I see VS has this turbo on sale for a few more days. It's normally $749 for $509.
https://turbo4less.com/product/vsr-7875-g2-5-series/
VSR Next Gen2.5 Series 7875 Aero
T4 Open .96
3″ outlet vband
I wonder is this wouldn't be a great first option for my V3 A/c Huron kit? I am shooting for 600 rwhp with my 5.7 ls1.
https://turbo4less.com/product/vsr-7875-g2-5-series/
VSR Next Gen2.5 Series 7875 Aero
T4 Open .96
3″ outlet vband
I wonder is this wouldn't be a great first option for my V3 A/c Huron kit? I am shooting for 600 rwhp with my 5.7 ls1.
I see VS has this turbo on sale for a few more days. It's normally $749 for $509.
https://turbo4less.com/product/vsr-7875-g2-5-series/
VSR Next Gen2.5 Series 7875 Aero
T4 Open .96
3″ outlet vband
I wonder is this wouldn't be a great first option for my V3 A/c Huron kit? I am shooting for 600 rwhp with my 5.7 ls1.
https://turbo4less.com/product/vsr-7875-g2-5-series/
VSR Next Gen2.5 Series 7875 Aero
T4 Open .96
3″ outlet vband
I wonder is this wouldn't be a great first option for my V3 A/c Huron kit? I am shooting for 600 rwhp with my 5.7 ls1.
$509 is a great price for that turbo