Info on 408 turbo sizing
#1
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
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.
#3
#4
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
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.
#7
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
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.
Trending Topics
The following users liked this post:
hispeedbinder (09-26-2019)
#9
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
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.
The following users liked this post:
hispeedbinder (09-28-2019)
#11
TECH Veteran
iTrader: (1)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
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.