Joe Anstett

Forgive me, this is a repost from the main 924/944/968 forum, I haven't posted on Rennlist for about a year and forgot about the 951 sub-forum.
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Over the holidays (and routine maintenance) I had my 1986 951 dyno-tuned and I'm very pleased with the results - up 20 horsepower and 40 lb-ft, and both curves moved left 500-1000 RPM sooner (meaning the power comes sooner/lower down). I'll post the graph as soon as my scanner cooperates.

Power mods are:
- B&B Tri-Flow headers
- FabSpeed exhaust w/o cat
- Lindsey Boost Enhancer
- Old stock-mapping chips

Coming in, the car made:
251 whp @ 5500 RPM
237 lb-ft @ 5000 RPM

After tuning:
269 whp @ 5400 RPM
277 lb-ft @ 4400 RPM

which, assuming a 16% transmission loss (M5 tranny) should put it roughly at 320 bhp and 330 ft-lb at the flywheel.

Apparently the car used to be running rich (it runs great now, much smoother under acceleration), and it also had a very weird harmonic balance issue on the dyno that would cause it to shudder at certain rpms (yet it is fine on the road).

I'm pleased with the results, especially the big gain in torque. The added volume under the torque curve is impressive, as you'll see when I post the chart.

So, what do you think? Good results? I'm curious to know other people's results, both in stock form and modded to roughly the same degree as mine.

Thanks to the crew at PowerTech in Rockaway, NJ.



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1986 Porsche 944 Turbo
2000 Pontiac Trans Am
2002 Jeep Liberty Sport

Weedo

Looks good! I recently had my '86 Turbo on the dyno as well. With the AutoThority Chips and a Catless pipe, it put down 253rwhp & 290rwtq. When the boost hits, it HITS!

pozican

Interesting. I had mine dyno'ed a couple weeks ago when it had:
LR Boost enhancer
WG Shims
951MAX chips
3" exhaust (no cat)

And I got something like 227 hp and 249 ft/lbs tq

I find it wierd that I got more tq and you got more hp

schadenfreude

Interesting - this is with a K26/6? How much boost?

I had my car dyno'ed recently at a conservative boost setting to see how my AFR was going; see sig for mods. I got 202.9 kW at the wheels (which is around 270 HP) at around 5200 RPM.

Weedo

I still haven't figured out why mine makes so much power (relatively speaking, only a chip and cat-less pipe). I've dyno'd about 5 cars at this shop too so I know it's accurate.

http://members.***.net/andywheaton/9...est%20Pipe.JPG

JE_951

Joe: how much boost?


Weedo, what boost was that at? I got 313rwtq at about 3800rpms-ish? and then it tappered down to 11.5psi at redline so i only got 251RWHP. my turbo has 174k miles on it w/o a rebuild also so i didnt expect it to have any larger of numbers. (26/6 btw).

Joe Anstett

Yes, the stock turbo (K26/6), IIRC running between 1.1-1.2 bar (16-ish PSI?).

My crappy HP scanner has died (looks like the motor is jammed), so I'll have to buy a new one before I get that graph up.

Weedo

Good question, I'm not sure. It's the AutoThority Stage II chip. On the gage it appears to peak at around 1.7bar maybe? It's a 77k car that has had every maintenance and part replaced which I'm told will increase the power quite a bit from a higher mileage car...

Joe Anstett

Added dyno graph

WesM951

Dang, My 87 made 240whp and 257wtq with 115k miles. Then again i was running super rich. I'd say its on par for low miles.

2bridges

hey Joe

WOW! I would say great numbers.
you running boost controller to get 16lbs? or shimmed /upgraded wastegate? That seems too much without somthing else going on

edit:
My bet is you got chips and just don't know it yet