Turbo selection
#1
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I contacted VS Racing for recommendations for a turbo to go with, In the email I included all the details of my truck and what the intended use of the truck, They replied with their 80mm T6 1.32 AR 96/88 turbine wheel. I don't know much about turbos, obviously, but that size seemed little bigger then what I thought I should look for, But I bought it anyway haha. So for peace of mind, I'd love to hear some feedback on the sizing.
Vehicle is a RCSB CHEVY, Awd, auto w/ 2800 stall, 80/20 (DD/TRACK), the motor is a built 398, 11-11.50 compression, SS2 cam.
thank you
Vehicle is a RCSB CHEVY, Awd, auto w/ 2800 stall, 80/20 (DD/TRACK), the motor is a built 398, 11-11.50 compression, SS2 cam.
thank you
#2
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That T6 housing is huge, nothing wrong with that of course, but it makes packaging a little tougher. T4 would have been a little easier to cram in there, you didn't mention what year truck? GMT800? 900? That size Turbo is capable of 4 digit HP numbers no problem, so start getting $ for that trans build.
You thought about piston ring gap at all? Also, that CR is pretty darn high for a forced induction engine.
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#3
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I run a T6 S475 in my 90 OBS RCSB. LQ4 with SS2 cam. T56 Trans and 4.88s.
I LOVE the performance of that turbo.
That compression ratio you speak of for your combo is not ideal for boost. Compression makes power. But boost makes more.
I LOVE the performance of that turbo.
That compression ratio you speak of for your combo is not ideal for boost. Compression makes power. But boost makes more.
#4
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That T6 housing is huge, nothing wrong with that of course, but it makes packaging a little tougher. T4 would have been a little easier to cram in there, you didn't mention what year truck? GMT800? 900? That size Turbo is capable of 4 digit HP numbers no problem, so start getting $ for that trans build.
You thought about piston ring gap at all? Also, that CR is pretty darn high for a forced induction engine. ![EEK !!](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_eek2.gif)
![Grin](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_grin.gif)
![EEK !!](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_eek2.gif)
#5
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Last edited by 98Zeric; 05-21-2022 at 03:49 PM.
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spray280 (05-14-2022)
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#8
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No, i made it awd, I used the front axle from a 01 escalade and used NP149 transfer case..also converted to dual piston calipers (unrelated to awd conversion) from the 99-06. There is room, i am thinking behind the AC compressor, the turbo is a bit big, but i think I can make it work
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#10
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No, i made it awd, I used the front axle from a 01 escalade and used NP149 transfer case..also converted to dual piston calipers (unrelated to awd conversion) from the 99-06. There is room, i am thinking behind the AC compressor, the turbo is a bit big, but i think I can make it work
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#11
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I do have some pictures
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theunderlord (05-14-2022)
#13
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that answer comes with the qualifier of how good is your tuner. Ive run 21psi plus on a 12 to 1 engine on e85 but my tune was spot on. The higher your compression ratio the smaller your tuning window but with e85 it's still a fairly large window. whats your hp goal if I might ask.
#15
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that answer comes with the qualifier of how good is your tuner. Ive run 21psi plus on a 12 to 1 engine on e85 but my tune was spot on. The higher your compression ratio the smaller your tuning window but with e85 it's still a fairly large window. whats your hp goal if I might ask.
as i mentioned in the reply above to ddnspider, i don't really have a goal, the most i can get safely and reliably (to the motor). But if i had to put a number around 700hp would be pretty cool
#16
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I'm thinking 10psi would get you 750+ at the flywheel. That is doable for sure on e85. That is figuring 450 on motor alone. That is a low estimate but I figured for worst heads possible. I always try to err on the low side. Under promise and over deliver. The turbo you bought will easily do way more. 4 digit power is possible with a s480. Rwhp I'd rather not even try to guess since it's awd and the drive train loss is going to effect it alot.
#17
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I'm thinking 10psi would get you 750+ at the flywheel. That is doable for sure on e85. That is figuring 450 on motor alone. That is a low estimate but I figured for worst heads possible. I always try to err on the low side. Under promise and over deliver. The turbo you bought will easily do way more. 4 digit power is possible with a s480. Rwhp I'd rather not even try to guess since it's awd and the drive train loss is going to effect it alot.
#18
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OP - Please don't put a baby turbine T4 turbo behind 398CI, even the 88/96 turbine is kinda small for that engine size. If sticking with VSR their 85/102 would be about the smallest thing I would want on a 11:1 398.
Not sure why so many people want a lazy engine with a turbo, compression works great with boost.
#19
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OP - Please don't put a baby turbine T4 turbo behind 398CI, even the 88/96 turbine is kinda small for that engine size. If sticking with VSR their 85/102 would be about the smallest thing I would want on a 11:1 398.
Not sure why so many people want a lazy engine with a turbo, compression works great with boost.
Not sure why so many people want a lazy engine with a turbo, compression works great with boost.
Last edited by 98Zeric; 05-16-2022 at 06:55 PM.
#20
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The turbo i have has the t6 flange,that was my thought for a higher compression, to get away from a lazy motor, however my motor is closer to a compression of 11.55-11.65, I'm beginning to worry my current compression might be to high. i was shooting for up to 11:1... thank you for the recommendation