Discussion in 'Turbo's and turbo related parts' started by Alky V6, Aug 23, 2007.
Check your PMs please!!!
So an 80mm S400 variant with a T4 housing would be more than capable of 1100 HP @ 28 -30 psi efficiently?
Id bet it would take more than 30 psi on a 275ci to hit 1100hp.
How about 224 ci?
Mine ran 9.20 at 151.99 at 30#s of boost and it spooled awesome
I ran 35#s nut it showed no gain over 30 on my setup
The EX a/r was a 1.10 if i remember correctly
Also the car weighed 3580#s on that run.
It also took a real good convertor to get it there
It ran a best of 9.46 at 147.11 with my Art Carr
I installed a PTC convertor Dusty and Chris brought with them(Billy T's convertor)Thanks Billy!) and it went right out to run
the 9.20 at 151.99,This was with a 60 foot of only 1.49
IMO turbo works great,The GT4276 will probably run just as good
Im not sure of anyone running their car at the weight I did that has the 4276
Go with the biggest exhaust a/r you can get and spray the hell out of it on the line. Id bet that would give you a few mph.
Thanks for the feedback Otto. What was/is your CID?
You may be on to something there.
Yes we could build one on a T4 chassis that would spool quick and make those #'s.
How would a GT42 76 or 76GTS compare? I'm thinking about switching from my current 72R. Thanks in advance.
JZ, What would your recommendation be for the turbine housing as far as A/R goes for a person who is injecting a large amount of nitrous to assist spooling (turned off at 16 psi) compared to a setup that is not?
Also, would there also be another A/R choice for a person deciding to use the nitrous injection for the complete 1/4 mile run?
Have you had any past experience doing setups where nitrous injection was used? Stories to share?
Thanks for your input. It is greatly appreciated.
It will make less power then a BW hyrbid......
LS1TECH - ST80 vs 76GTS some tad bit of info....more will be coming
A/R wouldn't really change in relation to the N2O for spooling. We have had supra customers running spray with our units for quite sometime.....no big deal. As for A/R's I would probably suggest a 1.1A/R for big power with spray being used to lite the turbo off. For complete runs, then I would suggest moving up to the larger 1.19 or 1.22A/R.
The 72r will support ~900HP, you should be ok with your current motor combination. If anything I would put a smaller turbine wheel on it to spool with your 231ci motor. If you swapped that out with a ptrim wheel it would be a lot more fun to drive and race. I have driven the car, specified out the motor, tunned on the fast and that is my opinion. :biggrin:
Thanks Jose and John.
John, I thought you may know a thing or two about the car.
Peter, I want a ride next time you are in town! =)
I hope you and Jen are having fun.
If you are not having any issues with the turbo I would just
get the smaller wheel put on it. For right now I would just consider it
ghetto traction control!
I have a Borg Warner S474 T6 1.10 A/R waiting to go on my blow through 69 GTO next spring. There was an RX7 that laid down over 1k at the wheels with this very turbo ( really high psi though ) so an 80 would make killer power even in the T4.
I have read many times how guys make the exhaust housing really big if you are going to spray it off the line, more juice = bigger ex housing.
I don't see BW or anyone wanting to tool up a 3 bolt housing. What might work is convincing that new SS header manufacturer getting into the market at $300 and have them make it a 4 bolt with a bolt on 3.5" DP. Then welcome to the world of cheap turbos that make mad power.
I will email them as next summer I plan on stepping up my program and a 70BB T4 would make a killer street combo.
That 62 & 66 wheel look very interesting to me. From what I have seen, these wheel will flow hugh amounts of air even on low boost. If you have enough head + intake flow I have seen them max out with flow of 15lb but making big power. I am wandering if the ETT wheels will have problems with compressor surge on a smaller low RPM engine. I know the imports have some of the big wheels in use but they can rev big RPM.
If no problems come up with surge, I think a hybrid with these wheels would kick.
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