Darud35

I'm looking to upgrade from a K26-6 turbo to something like a T3/T4 hybrid. The car will see a mix of street and track so I'd like to avoid oversized turbos with increased lag. I'll be running a stock 2.5L with cat-delete, M-Tune, 80# injectors, 3bar regulator.

I've read a lot about the T3/T4 hybrid, and it seems like the 50 trim compressor and a stage 3 wheel is a great match for our car. I don't mind some modifications to ensure proper fitment. What do you guys think about this option?

http://www.full-race.com/store/turbo...e-turbo-1.html

Price is certainly attractive. Anyone buy from full-race.com? I spoke to them on the phone and they really recommended the BorgWarner such as this:

http://www.full-race.com/store/turbo...-75-turbo.html

I haven't heard any 944 user reviews on this, and I don't believe the inlet/outlet are a proper match.

Rogue_Ant

The turbine housing inlet and outlet will not bolt-up... You will have to modify your crossover flange, and downpipe in order to work. The BW turbo you linked is very comparable to a GT35, and is a bit big for a street 2.5L 951.
A better sized option would be the S200 series stuff, the 56mm inducer version. This is very comparable to the GT30, which is an excellent turbo.
Additionally, the S200 stuff from full race seems to only be offered in twin-scroll configuration... Again, not ideal, as adapting a proper twin-scroll crossover is an added difficulty.

These guys have a better turbo option for the same S256 BW turbo:

http://www.bullseyepower.com/S200.asp

Selecting one with the 4-bolt turbine outlet has a chance of working with our downpipe, or at least be close... The turbine inlet is still wrong, and you will have to modify your crossover to match.

Darud35

Thanks for the info Joshua!

Am I looking for the 69.5/61.5 Or 74/64 turbine wheel? Do you think it's worth the extra $465 for my use? Basically I'm getting ball bearings for that price...or is the BW a better turbo in other respects?

Rogue_Ant

The smaller turbine wheel is closer to the GT30r, and will spool a little quicker, at the expense of max power potential...

The BW turbos are good units, but how much better is it than a 50trim, ball-bearing unit? Refresh951 went with a 50trim ball bearing unit, and looking at his dyno/logs I do think this is a great option:

http://www.refresh951.com/Dyno.htm

However, the BW has more power potential, so the question is 'what is your end-goal?'

Darud35

My end goal? GO FAST!!

Hah thanks for the info on refresh. We had a long discussion tonight and he had some great advice.

But seriously, I want it to be a fun street car where I don't have to keep it at peak rpm to stay in the power band. I do intend to track it, but not exclusively. At least not at first. My real concern with the first link is that it's only a journal bearing turbo (despite the drop down ball bearing option). That doesn't make it an apples to apples comparison of Shawn's setup. Is his more like he BW you recommend?

Rogue_Ant

The closest version to Shawn's setup is the ball-bearing option'ed:

http://www.lindseyracing.com/LR/Pors...R-SUPER48.html

That turbo should be nearly identical.

Darud35

Hmmm..man I was all excited about a $700 turbo! If BB is THE way to go I don't want to skimp out on it.

Assuming I can get an adapter from Vic to install the Garrett, do the journal type bearings have a notable difference? I've never seen dyno results or heard of someone doing a back to back comparison.

Rogue_Ant

If you are going through all the trouble to fit a GT based turbo, then I definitely go with ball-bearing...

Darud35

I suppose so. You recommend the BW over GT? I have no preference or experience..

Rogue_Ant

Both are good turbos.
My personal preference are Holset turbos...

pole position

Don't get hung up on Ballbearing, the spool between ball/journal bearing is almost /if not the same but you get more reliability when you run high boost with ballbearing turbos. By high boost I mean 24psi and up , not too many 951 owners run that.

The BW are great turbos but you are reinventing the wheel, as Josh mentioned the above T4 50 trim will bolt right up , if you are willing to do fab work then you might get as well a GT3076 or Precision 5858, the first one you need a shim or better , the Tial mount or the latter will bolt right up. Both need new oildrain/supply lines plus crossover/downpipe mods unless you mount a KKK #8 or 10 housing on the Precision and no fab work required. The KKK hot housings are relatively small and produce a lot of backpressure but also spool relatively early at low boost when coupled with a large cold side. The GT3076 or the Precision 5858 with their original hothousings will only shine if you are not afraid of boost due to the larger and more efficient hothousings. If you planning to stay below ~18 psi the restricted KKK housing will produce a better powerband in a street car at the cost of high EGT's, as already mentioned , high backpressure if you decide to up the boost to the 20's.

333pg333

I have a Tial / Garrett dbb GT3076 .63 for sale. It was on my car previously for about 1000 miles. It is in excellent condition, but there are a couple of very small nicks on some of the blades. I have no hesitation in believing that there would be no loss in performance. No shaftplay.
I think this was a great turbo on a stockish 2.5L car. I think this was about $1500 new. I'll entertain offers around $1k.

lol, just to complete the hard sell, here's some incar video where you can see it close on one of the quickest GT3s in our club down the straight. Sorry to bore the rest of you. Excuse some of the Numptiheaded driving. No reflection on the turbo
part ii of the sell. The race suspension off that car is for sale too.

OzJustin

Just out of interest, what are you replacing it with Patrick?

333pg333

I've got a similar but larger version of the same thing Justin. For a street/track car I really loved this turbo.

reno808

I have the same exact turbo