Info on 408 turbo sizing
Thread Starter
Teching In
Joined: Sep 2019
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Info on 408 turbo sizing Hello, this is my first post so please bear with me.
I am building a 408 out of an lq4 engine for my 72 Nova. It will have all forged rotating assy, BTR stage 2 or 3 turbo cam and Holley Hi Ram Intake.
Power goals are appx 700 with the option of turning up the boost occasionally. This is primarily a street car with 1 or 2 times a year track use.
Im thinking of possibly a BW S475 or I already have a Forced Inductions GT91 with 1.08AR exhaust housing.
Id like to use the GT91 as I already have it but am afraid it might be to big.
Any input would be greatly appreciated.
I am building a 408 out of an lq4 engine for my 72 Nova. It will have all forged rotating assy, BTR stage 2 or 3 turbo cam and Holley Hi Ram Intake.
Power goals are appx 700 with the option of turning up the boost occasionally. This is primarily a street car with 1 or 2 times a year track use.
Im thinking of possibly a BW S475 or I already have a Forced Inductions GT91 with 1.08AR exhaust housing.
Id like to use the GT91 as I already have it but am afraid it might be to big.
Any input would be greatly appreciated.
Thread Starter
Teching In
Joined: Sep 2019
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TECH Enthusiast
Joined: Dec 2017
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The 91 i think will be better but it depends on what turned up means. Honestly i think it will fairly low boost to hit 700 on a 408 and the s475 would do that but if you go with the 91 it will leave you alot of growing room for later on. It will probably be a little lazier spool but not a ton and getting some of the wee out of the car makes it more enjoyable in my opinion and helps limit the ohh **** moments.
Thread Starter
Teching In
Joined: Sep 2019
Posts: 7
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That would be my guess too. Kicker is, I have the 91 on the shelf. Not that the 475 is very expensive but Im thinking I could try out the 91 and if its too lazy Ill switch it out. I just wanted to be sure It wasn’t going to be too ridiculously large for the application. Could be cranked up to 1000 on occasion.
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Verdad Gallardo Thread Starter
Teching In
Joined: Sep 2019
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Was going to use my 317 heads but found out today they are fatally cracked. Would like to stay below 2000 on heads and was looking at a set of stock LSA heads pretty hard. What is you guys opinion on those? That or stock LS3s. Top end of my spectrum would be cnc ported LS3s but I think my power goals could be achieved for less.
Hello, this is my first post so please bear with me.
I am building a 408 out of an lq4 engine for my 72 Nova. It will have all forged rotating assy, BTR stage 2 or 3 turbo cam and Holley Hi Ram Intake.
Power goals are appx 700 with the option of turning up the boost occasionally. This is primarily a street car with 1 or 2 times a year track use.
Im thinking of possibly a BW S475 or I already have a Forced Inductions GT91 with 1.08AR exhaust housing.
Id like to use the GT91 as I already have it but am afraid it might be to big.
Any input would be greatly appreciated.
I am building a 408 out of an lq4 engine for my 72 Nova. It will have all forged rotating assy, BTR stage 2 or 3 turbo cam and Holley Hi Ram Intake.
Power goals are appx 700 with the option of turning up the boost occasionally. This is primarily a street car with 1 or 2 times a year track use.
Im thinking of possibly a BW S475 or I already have a Forced Inductions GT91 with 1.08AR exhaust housing.
Id like to use the GT91 as I already have it but am afraid it might be to big.
Any input would be greatly appreciated.