97 M6 formula
New Coil, Wires, Plugs, Opti. The car ran great after this but.....

New clutch install... Loss 4ths and 3 Mph??

Scanned the car and hear is what found.

O2s at WOT- 820/840 at all rpms and gears

2-4* of KR in all RPMS and gears

28-34* of Spark advance depending on the run.

19 for IPW average untill 5,000 RPMs and then its 20.XX or so.

Coolent temp was arround 190*

IAT were arround 84*

STFT and LTFT seems OK but Im not sure. What should they be??

Also let me say this.. 2 months ago I logged the car and it was noting like the above.. 890ish O2s....0* KR......36* SPA.....

Please HELP....Mods below

MODS.....CAI, CAT BACK, AIR FOIL, VORTEC ELBOW, DE SCREENED MAF, Mc Cleod single disc, 160* stat and Plugs a Auto lites 104 gapped @ .040 for Nitrous but car has never been sprayed!!

 

Your scan data looks good. Your O2S don't look like they are going lean, KR isn't terrible since your advance is still high. Your IPW doesn't seem low but I don't know what normal would be, you would need to compare to another car or a similar previous run. If it were a problem your O2S would read lower. ST and LT should read 128 if you are OBD1 and 0 if you are OBD2. I think you are OBD2 so it should be 0 or w/in 5-8, especially if you go to open loop under WOT. Are your block learn or fuel trim cells increasing? Did you notice a decrease in 60 ft times? Are you recording any misfires? Were your previous runs consistent and were these runs consistent? More heat or humidity can affect the performance.

 

Just pull your floor mat out from under you accelerator pedel.

Seriously though......I hope you work out your problem.

 

ttt for ya j, please anyone who can help, what can make a 10 hp and 20 ft pound of torque at the rear wheel difference, with nothing changing but a new clutch and a new driveshaft. Any help is greatly appreciated here, than guys.

 

Umm...... hello....820 is lean, 34 * advance & 820 means SLOW! you want to keep the o2 above 900, perferably 920's range on both sides, at WOT you don't want to see almost any KR, max at WOT you wanna see is 1* or so MAX, otherwise I'd look into bad gas perhaps. 20XX IPW is very high & is a sign of small injectors with o2 readings of 820.

Again all this can be caused by bad gas. If gas is good get:

+New injectors (bigger) seeing your IPW
+If injectors are big look at your fuel pressure, if lower then 41psi at WOT, I mean like low 30s its a bad fuel pump/filter
+KR would mean either bad KS or its really bad gas & you have a tune that limits the KR to 4* tops


But all this can be caused by bad gas so get that first I'm willing to bet its one of these problems.

Ps. I hope that IAT readings is in Ferenghiet(spelling).

 

Well I dynoed the car and I loss 11hp and 18tq @ the rear.... I did not just lose it at peak power but it lost it all from 2,200rpms and up untill redline.

Im gonna go back to the gas I was running (sunoco 94) instead of the 93 from Citco. (close to home) Im allmost of a gas now so Ill run to sunoco today and reset the PCM and rescan the car this weekend after some abuse.

I installed a LT4 KM yesterday just for giggles before my dyno run and It did make for smoother lines but still a loss of power.

New gas first then Im stepping the plugs back up to 106s @ .050 instead of the 104s @ .040 (nitrous plugs) but never sprayed yet.