Well, here she is, Lorelei. 1987 951 with the following bolt ons:

*APE Stage II chips
*3bar FPR (wanted to make sure it didn't get too lean up top)
*AccuBoost MBC at 16psi
*3mm wastegate shim... not even close to enough
*Heat-wrapped headers
*Cat-converter cores removed
*Hot Air Conical Intake, haha (previous owner, don't blame me)

174,000 miles old, has it's qualms, but generally still runs like a champ for what she is, a 19 year old C5/996 killer with a HORRIBLE tune. Check it out... 16psi down to 11 by 6000rpm; under 10:1 from 2500-4500rpm. I love my car... 2 years from now, this baseline will be blown apart with a WELL-TUNED TO4E setup sporting lots of goodies, a good bit of boost, and a goal of 400whp.

For reference sake, the dyno was a DynoDynamics load-type dyno from Australia. Mind the scales on either side of each graph.

GOD BLESS THE 951

 

O sweet, this is just about the exact same set up have, same year car too. WIth a better tune, and Tial you should be seeing more. Good luck man!

 

Pretty good numbers given the a/f curve...
Is your O2 sensor working OK? 11:1 at 2k rpm isn't normal/correct/good...even with the 3 bar FPR.

Going back to the 2.5bar FPR? Might bring you to 13:1 at redline (edumacated guess)....but if you shift a little early at 5500...you should be good.

See ya in michigan Lets hope the proving grounds dont suck too hard logistically.

 

Wow, that looks incredibly rich! Maybe those APE chips didn't want the 3bar FPR adding extra fuel?

 

is that brent hughes in the drivers seat? i go to DTP too. nice guys, did you see his 460whp vette or his 420+whp rx7? I should be down there tomorrow to see my gains after installing the LR 3" exhaust.

 

Looks familiar to my dyno chart when I had APE chips and a stock turbo (k26/8). I'll have to see if I can find the old dyno sheet. I do know that my air:fuel mixtures looked very much the same.

 

BTW, I basically had the same results power-wise with my car. But my car peaked @15.4 psi and dropped off to 11. my numbers are in my sig.

 

JG, yeah, that's him. He spoke of you, actually. I think I know what your plates are (though I won't say it for security purposes on here), haha.

I'm headed over there tomorrow, actually to talk to him... where is Ft. Monroe?

Adrial... hey buddy, I don't think I'll be up in Michigan this year, unfortunately. Summer plans are slightly overriding the comp. My O2 could be bad, though it could just be slightly fooled by being incredibly rich and having no cat in the mix anymore. There are many factors... I'm not too worried about it now, but it'll be checked out before too long

Matt P., correct, it wasn't meant for the 3bar FPR, but because the last plugs I had on there were white tipped, I popped on the 3bar in place of the 2.5 for a safety measure. As you can see, the a/fs were on the rise at the end of the pull (though it doesn't really matter, the power dropoff was ending it anyways). I'm going to shim the wastegate some more later on and keep the 3bar on there. That way I can turn it up to 18psi, maybe bleed off to 14 or so by 5800 and just shift there for the time being.

 

ft monroe is in hampton...... i should be at DTP tomorrow between 3-4pm.

 

In that case, I'll see if I can work a schedule out to be over there around 3-4 so we can chat for a bit

 

You should get a tial. Your boost curve is about 500-1000 rpms to the right too far. You should be seeing atleast 11 psi at 2800 and 15 psi around 3000. Also with a Tial or aftermarket wastegate you will bring your afr up in the higher rpms. You might also have exhaust cracks, but you should be seeing boost sooner than that.

 

Ian, yes... the funny part is, after a 17psi run, I cranked the MBC down about 2 turns to let 'er rip. Not only did the peak boost drop to 17psi, it lagged about 400rpm. Go figure, haha.

 

Gotta love APE2 chips and their valley of riches! I'd turn down the fuel pressure and get a nice wastegate.

 

Stock FPR is probably better. I wonder what my car will do with its K26. I have a maf on the way, so setup will be maf, built head (.5 raise in compression, radiused valves, full D port and match IM etc) and 2.5 test pipe, 3.0 cat back... I'll probably turn boost down to 16 from 18... you think 260rwhp?

 

good numbers kevin. Glad to see you posting again.

We really need to catch up soon brother.