951blur

Guy,

Which turbo is going to spool up very quickly and hold 15 lbs of boost? This will be my autocross car and cruiser for the hills. Currently I have the lindsey racing super 61 turbo that comes in the 340 whp kit. It doesn't really make power until 3500 rpm and that is a little high for AX.

I rode in a stock 944 turbo the other day and it spooled up much quicker. I want something similar to that but, with the extra ponies

LUCKY DAVE

You can have one or the other. Choose.....

951blur

I would choose quicker spool over loads of power.

Is it really going to drop the rpm of when the boost hits that much since I have several performance parts on the car? What is the power loss of going to a smaller turbo?

It was my understanding that people can custom build a turbo to spool up quickly and hold 15 lbs of boost. That is not much more than stock psi and I want this fresh motor to last 150k miles

blown 944

Gt2871

lee101315

You should really consider a S2 gearbox, the 951 gears are way too long for AutoX.

Sixline

K27/6? Should spool similar to a stock 26/6 and hold boost longer.

I have never used one though and am only basing that off of what I have read. I will let the more experienced people talk.

jmj951

Theoretically, the Borg Warner EFR with the titanium wheel should give quicker spool and more power than a 26/6 or 27/6. That would involve a lot of fabrication and custom mapping though. It's been talked about on the 944 turbo forums, but I don't think anyone's done it on a 944.

pole position

http://www.irozmotorsport.com/k26-billet/

951blur

When you say gear box are you talking about the transmission or the gearing? I know on pick up trucks if you change the gearing in the in differental it is night and day. IDK on these cars

The Autocrosses that I run for the LSRPCA are a full on 2nd gear course with rpms ranging from 2500-4000 80% of the time and 4000-5000 10% of the time. I think with shorter gears it would hurt my times because I would be shifting more.

Can anyone recommend any turbo shops in the Houston area?

User 52121

Based on my own research and conversations with a couple 951 guru's - Sid is right. A new GT/GTX series Garrett is probably the best setup. I've had lots of conversations with Dave @ CEP and he swears up and down that those turbos work wonders. It's a bit of custom fab to make them work, though.

If you're looking for a straight bolt-on, you'd probably do OK with the smaller Lindsey Super-48, or a K27/6 already mentioned. I have a DBB TO4E on my car (with a replica /8 hotside) and I'd say it spools every bit as fast as my old 26/6 did but with lots more meat.

Also as Lee suggested - S2 gearbox works wonders too. I'd also highly recommend an M-Tune (or at least an A-Tune) setup. Spool up and low/mid power is HUGELY improved.

I'm the Auto-X coordinator for my PCA region, I AX a lot. S2 box, TO4E, and M-Tune makes the car pretty competent for AX. It's no Cayman R on a tight course but I *have* beaten them on faster courses.

I think, for your given setup, I'd go in this order:
M-Tune
S2 gearbox
Different turbo

User 52121

I'm sure he's referring to the entire gearbox out of a 944S2. It's a different R&P and a different 5th gear. Makes a pretty big difference. Car is a lot more 'squirty' and gets off the corners a lot better with it in an AX.

You could just swap in the R&P but then you'd be turning higher RPM on the freeway in 5th.

951blur

I plan on doing the M-tune and turbo at the same time while I am rebuilding my engine. I just want to start fresh so I am Rebuilding it, ripping all the old maf kit crap out from lindsey racing and replacing with everything from Rogue Tuning "M-tune kit", and I am worried that when the piston rings went it messed up my turbo wheel and the turbo is ****. So I figured I would optimize the car for AX

I just paid to have my transmission rebuilt so I won't be swapping it out any time soon unless I could make a profit on it.

What kind of custom fab would have to be done to make the GT/GTX turbos work?

User 52121

Sid (or a search) can probably get you better info on what's needed to make a GT/GTX turbo fit. As far as I understand it, generally you need custom oil and coolant lines, custom (or modified) crossover pipe, custom (or modified) downpipe, and (not sure on this part) custom turbo pedestal.

pole position

A Gt/GTX plus fabwork, custom mount or modded stock, oil lines down/test/ pipe in high quality stainless is going to be at least between 3-4 k depending if you wrench and can tig . Way higher if a shop does it for you.
That is the reason those builds usually are only discussed in words and the deed never follows.

Sixline

Rogue Tuning and Dave Novak are planning to release a VNT turbo kit this summer. Hopefully it becomes a reality as it would be the ultimate setup.

https://rennlist.com/forums/11240415-post44.html - His recent post about it.

https://rennlist.com/forums/944-turb...i-said-it.html