Turbo and torque converter for aluminum stroker build

[chris kirk]

Have an aluminum TA stroker motor, TA heads and headers (4 bolt), Champion race intake, roller cam 224/218, 9:1 with xfi, 3 1/2 DP with 66mm (external) wastegate, RJC front mount. Motor was built by Nick Micale. Looking for right combination of turbo and converter. Looking to make 700 plus hp. Thinking about 4 bolt, PTE 7675 CEA bb .81 a/r. Street and track. Not a daily driver, but also, not a track car. Purely a hobby.... Might drive the car 300 miles a year. Other changes I made are; rebuilt tranny, 30 spline axles, driveshaft and u-joints, Ride Tech upper and lower control arms, coilovers, front sway, HR rear sway, rear upper and lower control arms.

 

[GetOwnedVette]

Umm..with that shiny setup your goal will be EASY to achieve with many a turbo!

 

[Pronto]

Did you ask Nick what turbo to use?

 

[turbo nasty]

Honestly you have to pick your turbo for your intended goal. That engine will flow some air and fuel in and out. If you want quick boost response on teh street but not so much track top end pull, etc this all needs to come into plan.

How about pick a ET goal, HP goal, etc and then give or take away from that.

 

[jasjamz]

67 hpq and a small 4 bolt housing
3200-3400 stall converter
plenty for a street strip car.

 

[chris kirk]

I appreciate the input, gentlemen. Thank you... I have spoken with Nick about it as well and he has told me pretty much the same as everyone here has, same with Precision when I've spoken to them. I guess what I want to make sure of is getting it right the first time, for I don't want a garage full of turbos and torque converters. They're not exactly cheap.... Trying to find something right in the middle. I don't want something that is all torque at the starting line and has nothing left at the finish and at the same time I don't want a bunch of lag going from light to light but that's great on the Autobahns. I realize that there are sacrifices one has to make when trying to do both, a street car and a strip car.

 

[bison]

All that engine and turbo to only make 700hp? It's up to you and what you want drivability to be like.

 

[John Wilde]

That turbo can flow enough for 1200 hp so unless you want to make 1000 I would not even consider it.
With the extra air flow and cubes I would do a 68 exhaust wheel.
A billet 6768 or 7168 with a PTC NL 9.5 inch would drive nice and have low 9 second potential.
8 Second potential if you are Jason White. =)

 

[kidglok]

And with those cubes lag would be non-existent


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[chris kirk]

I'm not sure what kind of hp it would make. What are your thoughts? I say the 700 hp range but maybe it will be more. Depends on how much boost, too. If it's more, then great. I'm not knocking it. What converter and stall speed would you recommend. PTC 9 1/2 and what stall? Would you use an .81 a/r or the .96 a/r? Would there be to much lag with a .96 a/r for street driving? I know it wouldn't be great for the track. When I spoke to Precision I asked them about the 7168 cea and the 7275 cea. Said they were nearly identical. They said if you have a 4 bolt aluminum stroker, then use the 7675 cea. I would like to know your thoughts on drive-ability.

 

[Dusty Bradford]

You say it's an aluminum T/A stroker so I assume it's a 274ci? A 274 with that cam would probably like to shift in the 6200-6400 range so for better response I'd look at the 6768. I'd set the converter up so you'd see boost by 3000rpm. Generally a motor that size has more cam in it and turns 6500-7000 rpm in which case you'd want a 71-76mm turbo. Considering the cam size, I'd run the smaller turbo so you'd have little lag and have an easy 9 second combo.

 

[bison]

You say it's an aluminum T/A stroker so I assume it's a 274ci? A 274 with that cam would probably like to shift in the 6200-6400 range so for better response I'd look at the 6768. I'd set the converter up so you'd see boost by 3000rpm. Generally a motor that size has more cam in it and turns 6500-7000 rpm in which case you'd want a 71-76mm turbo. Considering the cam size, I'd run the smaller turbo so you'd have little lag and have an easy 9 second combo.

^^^this

 

[MCH86GN]

Wow, I bought 224/218, great price, for 109 stroker. I guess that cam is overkill for my build. I'm looking to run low 10s, I hope my cam isn't overkill. The guy that sold it to me said it would be great for a stroker.

Sorry, not trying to hijack your thread.

 

[John Wilde]

Wow, I bought 224/218, great price, for 109 stroker. I guess that cam is overkill for my build. I'm looking to run low 10s, I hope my cam isn't overkill. The guy that sold it to me said it would be great for a stroker.

Sorry, not trying to hijack your thread.

That is not a huge cam for a stoker.
I have run much bigger in a 3.8, I wasn't trying to be streetable though... =)

 

[GNDriven]

Dusty and Bison are prob correct, but I do like my 76. If you are like me and this is your first stage II with plenty of potential, then you might follow the path like most and really believe your first goal is the only one, but then prove otherwise. I started out with a goal of having a 9.50 et car without a crazy low sixty foot say 60ft> 1.50. Then after that goal was achieved, I wanted a 9.30 et with a better 60ft, say 60ft< 1.40. This year I am wanting 8s. That I believe how it progresses for most people, that can be lucky enough for their motors to live a couple of seasons. I am not sure if you are truly dead set on a particular goal, but the itch of having the potential there and not scratch it is too great for me. I have a 224/224 cam which sounds about like yours. I run on the street and the track, 76 has plenty of growing room. As far as the fun on the street, I promise I can leave on 2 psi and spin the tires until Mickey Thompson brings me some new ones.

 

[turboclam]

I'll be trying a 226-226 HR with a 4 bolt .81, 71GTQ.

 

[ttypewhite]

IMO I would go with a 71 series turbo. If you go with a 76 series turbo your tranny is going to be on borrowed time (assuming you have a 200R4). 76 turbos will make more torque and power when its loaded up and let go. I was looking at Lonnies best 2004R with all the goodies and he said I would blow it up. A TH400 or 4L80E is your best bet when going with a turbo that big. When building your setup, properly select your parts, because it this level when things go sour.......... it costs a lot to fix it the way it should have been to begin with. So factor a 7k budget for a 76 turbo, proper tranny, converter, driveshaft, injectors and a good tune provided your wrenching on it yourself.