questions about s475 before I purchase
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Teching In
Joined: Mar 2015
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questions about s475 before I purchase Planning my lq4 build and my goal is around 800 rwhp with a stock crank, h beam rods, and forged pistons. I am looking at Borg warner s475 to s480. I will be running a 3600-3800 stall with a trans brake and I want something that is capable of making the horsepower I want but I want it to spool up hard when I bring it up on the brake so it launches hard. Originally I was looking at an t6 s475 with 83mm turbine and 1.10 a/r. I picked smaller turbine and a/r so it would spool early. Can I would like to go with is a tick stage 2 and I am gonna run e85 so I am thinking somewhere around 95lb injector. I would appreciate any feedback from people with experience with similar combos. I have done many many hours of research over the last month before posting this and this is the best combo I can come up with for now. Thanks guys.
Last edited by pdm14269; Apr 8, 2015 at 08:45 AM. Reason: text wrong
Staging Lane
Joined: Jul 2012
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From: Detroit, MI
Yep. Would probably work both ways. I was just going to suggest the middle of the S475-S480 range for some room to grow. Maybe add a Race cover if funds allow.
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Thread Starter
Teching In
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Turbos I am looking at are on forcedinductions.com and for price I would like to stay under $1000. Reason why I wanted to go t6 is for better top end flow and I can run 2 1/2" feed tubes from my manifolds to the flange. I figured the big footprint would allow for a nice non restrictive transition into the turbo. I think 480 might be too big and 475 a tad small for future plans. Maybe 476 or 478. Just not sure on turbine size and a/r.
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I ran 2 1/4" piping into my T6 S480 92mm 1.10 a/r on my SBE LQ4 in my old Camaro. It made 727 rwhp on 16-17 lbs. It had no issues spooling except for on the footbrake. A 2-step helped that out though. You will be fine with a t-brake.
I just placed an order for my new turbo which is a T6 S480 96mm 1.32 a/r with a billet wheel. I will again be using a SBE LQ4 in my new car. Will aslo be going with 2 1/4" piping again. My old car had an early year motor so didn't want to push it too hard, but the new one is an 05+ so I will throw more at it. A box stock S480 would do what you want for sure and leave you with room to grow later on down the road.
I just placed an order for my new turbo which is a T6 S480 96mm 1.32 a/r with a billet wheel. I will again be using a SBE LQ4 in my new car. Will aslo be going with 2 1/4" piping again. My old car had an early year motor so didn't want to push it too hard, but the new one is an 05+ so I will throw more at it. A box stock S480 would do what you want for sure and leave you with room to grow later on down the road.
Thread Starter
Teching In
Joined: Mar 2015
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What is your reasoning for going with the larger turbine and a/r. Was it running out on top end? Were you on gas or ethanol? It seems like a lot of people are running 2 1/4" turbo feed tubes. I'm just curios why not 2 1/2".
Because larger tubing size only slows velocity/spool time. 2.5" is too large for an 800hp goal on your setup. 2.25" or even 2" would perform better IMO. And the larger 96mm s475 would be much better suited than the 83mm wheel.
FormerVendor
Joined: Aug 2014
Posts: 473
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Planning my lq4 build and my goal is around 800 rwhp with a stock crank, h beam rods, and forged pistons. I am looking at Borg warner s475 to s480. I will be running a 3600-3800 stall with a trans brake and I want something that is capable of making the horsepower I want but I want it to spool up hard when I bring it up on the brake so it launches hard. Originally I was looking at an t6 s475 with 83mm turbine and 1.10 a/r. I picked smaller turbine and a/r so it would spool early. Can I would like to go with is a tick stage 2 and I am gonna run e85 so I am thinking somewhere around 95lb injector. I would appreciate any feedback from people with experience with similar combos. I have done many many hours of research over the last month before posting this and this is the best combo I can come up with for now. Thanks guys.
plus the 83mm turbine doesnt really have the capacity to support a cast 80mm wheel completely... i Advise against putting that turbo together like that.
Thread Starter
Teching In
Joined: Mar 2015
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OK I like all the input. I was thinking that the smaller turbine would increase velocity therefore increasing spool time. Sounds like your telling me that the small turbine would have more restriction and hurt spool along with top end flow. Is that the case in this situation? I am used to the diesel theory about turbine size and and flow but that is all low rpm.
TECH Fanatic
Joined: Feb 2015
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Might consider 105s or even 120s to give you more opportunity down the road.
Thread Starter
Teching In
Joined: Mar 2015
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Any help is greatly appreciated. My father passed away 5 weeks ago and he was a machanic and drag raced for most of his life. The last couple years he has been pushing me to get my car back together but he was very old school. I am selling of my old small block stuff to fund this build and I just want to do it the right way and make him proud. I put this off long enough and I am motivated with all my heart to make this dream a reality so I greatly appreciate any input or advice that anybody has to offer.
