4 bolt turbo for 235ci

[broke1]

Whats the best 4 bolt turbo for an all out effort car w/ 235ci?Combo is as follows:

stock displacement .030 over,235ci
sheetmetal intake
small hyd roller in the 210/215 range
heads that flow in the 225int/215 exh
trans w/tbrake and whatever stall it takes(what stall?)
AMS 1000 bstc
3200# w/ driver

Streetability and cost are not concerns at this time.....GT42R????

 

[boostingbuick]

Call Jack at Cottons Performance. He will sell the right turbo and the price can't be beat. I just purchased mine.

 

[broke1]

Jack is the man but Turbonetics burnt there bridge with some of us long ago....

 

[86brick]

Jack is the man but Turbonetics burnt there bridge with some of us long ago....

I could be wrong, but I believe Jack also deals with Precision/Garrett type turbos as he has some listed on his website and I know in the past he has mentioned a few of his customers using the GT42 turbos.

FWIW, On my bro's new motor (249" iron headed 109) he is considering the standard journal GT42/76 turbo. Should make peak power between 24-28lbs and considering he will also have a trans-brake and is not too concerned with streetability he will probably get a nice tight converter from Dusty/PTC.

 

[broke1]

I could be wrong, but I believe Jack also deals with Precision/Garrett type turbos as he has some listed on his website and I know in the past he has mentioned a few of his customers using the GT42 turbos.

FWIW, On my bro's new motor (249" iron headed 109) he is considering standard journal GT42/76 turbo. Should make peak power between 24-28lbs and considering he will also have a trans-brake and is not too concerned with streetability he will probably get a nice tight converter from Dusty/PTC.

The GT42's are supposed to make alot more power at LOWER boost,not higher.Id think 24-28# would prob break a 109 in 2!!!!

 

[86brick]

The GT42's are supposed to make alot more power at LOWER boost,not higher.Id think 24-28# would prob break a 109 in 2!!!!

I'm sure we will find out. Speaking to a guy down here that has built several 109's with 4bolt turbos (that have put down 750+ to the rear wheels) he seems to think this turbo will definitely make a lot of power at low boost 24-28lbs being the max. As far as the breaking a 109 in 2, again we will find out hopefully you're wrong about that

 

[boostingbuick]

Well I don' know the story, and I am sorry for the post. But I would like to know, you can pm me if you don't want to post it. Thanks.

 

[broke1]

Years ago,te62 from Tnetic's were dying like flies,I had 2 of them go....And not to mention its the biggest bunch of incompetents when u call them to ask somthing.I will not support fools....

And I think that Louie and Chris Lyons were talking about running low 9's with 15-16# so I highly doubt your brother will see near 24 unless hes got a crappy set of heads!

 

[86brick]

And I think that Louie and Chris Lyons were talking about running low 9's with 15-16# so I highly doubt your brother will see near 24 unless hes got a crappy set of heads!

I seem to remember Louie saying he ran some high 9's with the GT42/76 at 16#'s on his 260" Stage motor that had some ported GN1 alums?? Maybe he will chime in. My bro's heads flow better than a set of Champion cnc ported irons that have gone 9.50's on a 109 so I wouldn't say they are crappy however I'm sure they won't flow near the #'s a set of ported Alums will. Hopefully the turbo does make make all the power on really low boost as that was part of his intention of going the 4-bolt route (that and you have a LOT more turbo options obviously).

 

[bison]

Whats the best 4 bolt turbo for an all out effort car w/ 235ci?Combo is as follows:


small hyd roller in the 210/215 range
heads that flow in the 225int/215 exh


Streetability and cost are not concerns at this time.....GT42R????

You need to build the engine to make all the power by 6400 rpm. You will be limited to about .550 lift. I assume you will be using 885 lifters. The cam and liters will limit the turbo that could be used. That is a weird flow number for the exhaust with an intake flow of 225. Any 67 to 76 with a GTQ exhaust will get it done. The more compressor you run the more you will need to turn the boost up to be in the sweet spot. If you only plan on 24-25 psi id keep it around a 70 GTQ. It should easily go 140mph with a 4 bolt setup if dialed in correctly. Id consider a 50-75 shot of N2O to spool it with the small engine. Hopefully your over 9.0:1. If not id seriously consider the N2O. Id also consider a solid cam build if you are not concerned about streetablility.

 

[ttypewhite]

I would give Billy Anderson a call. I bought both my PTE70GTQ 4 bolt turbos off of him. Great prices and great service. NOS would not be nessesary with a 76GTQ if tunned properly. Look at what Nordy Racer is doing with his 109 block and 76GTQ turbo(can you saymid to low 9's )

 

[bison]

I would give Billy Anderson a call. I bought both my PTE70GTQ 4 bolt turbos off of him. Great prices and great service. NOS would not be nessesary with a 76GTQ if tunned properly. Look at what Nordy Racer is doing with his 109 block and 76GTQ turbo(can you saymid to low 9's )

I agree it could be done without nitrous but it alleviates the problem of getting the converter just right which is much harder with small cubes and big turbos and it allows the use of larger a/r housings for reduced backpressure and more mph.He said all out anyway which means he doesnt have to conform to any class rules. He is undercammed regardless and needs to get it all done below 6400 so the 76 wheel is a little too much imo, that is unless he is planning on running 32-35psi and keeping the engine over 5500 rpm.

 

[broke1]

Undercammed?Nope,cam spec'd by Dan@DLS

Dan said to rev it 7000-7200!!

I think a 76 might be a little big for me....what A/R?

 

[Otto J]

The 76 GTS from precision is a wicked turbo and spools well also.
I went 9.42 at 146 in heat with one with a car weighing 3650

 

[John Wilde]

Whats the best 4 bolt turbo for an all out effort car w/ 235ci?Combo is as follows:

stock displacement .030 over,235ci
sheetmetal intake
small hyd roller in the 210/215 range
heads that flow in the 225int/215 exh
trans w/tbrake and whatever stall it takes(what stall?)
AMS 1000 bstc
3200# w/ driver

Streetability and cost are not concerns at this time.....GT42R????

Drew,

We run twin GT42R units on Chow's car.
They are the 74MM units and they spool very well.
We only have 198ci spooling each.

Since you are doing the 4bolt you could look into the Borg Warner
Extended Tip Stuff as well.

The head flow numbers seem a little strange.
The exhaust numbers are too high in relation to the intake.

Good luck with the car it sounds like fun!

 

[broke1]

Yea,thats what everyone says on the flow #'s...Dan had the cam cut to his specs taking the flow #'s into account.Im also using 1.65 int,1.55 exh rockers to cut down the exh flow even more.....I think it will run very good on a boosted application but well see!!

There are just SO many turbo's out there....that GT42R in 74mm is sounding real good!!!

 

[Red C5]

GT47-88, at least that's one I want to try out in the near future.

 

[XxDarkSidexX]

Look at what Nordy Racer is doing with his 109 block and 76GTQ turbo(can you saymid to low 9's )

Nordy's car is freakin bad ass! mid nine's all day; even in hot vegas weather! But Nordy's car isn't it, Nordy is one of the coolest cat's Ive met on the GN board, or in any club. We are very thankful to have him here in so cal; offsets alot of the "others" around these parts. He's a good friend and very generous, and very honest. Pretty hard to find these days. He sure showed me and everyone who went to pinks vegas a good time! He probably could have gone all the way too if those "other" jerk offs didn't jump so many times.

He can maybe chim in on the spool of his turbo, that monster 76gtq!

The gt47-88 is sweeet

XxDarkSidexX

 

[bison]

Undercammed?Nope,cam spec'd by Dan@DLS

Dan said to rev it 7000-7200!!

I think a 76 might be a little big for me....what A/R?

With what lifters? Ive never heard of anyone going over 6500 regularly with hydraulic roller lifters. They are too heavy and require a lot of spring to keep them on the cam. 853's are ok to about 6200 and the 885's are good for a few hundred more but both will go through springs if worked hard. Imo there is no need to be anywhere near 7000 rpm unless you plan on trapping in the 150 mph range. It would be a lot easier to get it done with more cam/different valvetrain components since streetabilty is not a concern. With a solid valvetrain you can open up a new window as far as engine speed which will allow the use of much larger turbos.

 

[broke1]

Ive had several sets of 853's rev to 6400,no prob,no valve float,now 6500+ with em is a diff story!!I will be using the 885's,I will not rev it to 7k as im iffy pushing a Buick that hard,just what Dan said...

I do not like solids,as it sucks having to adjust them(i know maintenence but im lazy)

With all the $$$$ parts on this thing and no class restrictions with weight and such,I dont see why it couldnt run 150mph....