TCW

iTrader: (3)

*Pictures at bottom*

1999 NBM TransAm M6, Torquer V3 231/234 .643/.598 111lsa, LS6 Intake, Ported TB, PS LT, PS ORY, Cutout, SLP Lid, 127k miles

Went to the track the evening of the dyno/tune. Long story short 2.2 60' 13.6 @ 106. This was with TCS, didn't realize it cut itself back on and didn't catch it until I was about to leave(1st non TCS run I had a 2.0 60ft[with traction issues] but missed 3rd)

366.8@6200 HP DYNOJET
353.5@4700 TQ

Right now I am trying to figure out why I had low numbers...

The night after the drag/dyno I decided to check if the plug wires where arcing. The front passenger plug wire was arcing to the header. Not only that, it was popped off of the plug, backed off about an inch. SES light wasnt flashing. ---- Only problem is I think the tuner would have noticed this while tuning and on dyno.

Think any damage to the rings might of been had from gas washing the rings clean.

Should my injectors be at 105% duty cycle with this power level(26lb)?





I did a compression check on the front four cylinders. Depending on how long I cranked it I would get 150-180psi. 2-3 seconds and 3-4 respectively. Also all the cylinders plugs have <400 miles on them and are white. Although some look greenish white w/e green means. I attached pictures of the plugs in order. Are you suppose to crank until max psi or a certain time?

It was running rich before the tune(smell) so could the A/F been tuned with one cylinder pouring gas causing the lean condition? Then again I was at 105% duty cycle so there is a lot of fuel. Maybe it was just misfiring? Or is it too consistent on the graph and the wire probaly popped off at the track?

Could it have ran lean because I need bigger injectors?

Thanks

cyl1-185
cyl2-180
cyl3-180
cyl4-175

300bhp/ton

Don't know what altitude you are at, but that trap speed seems low for the mods. As does the dyno. I think the graph is STD so if it was poor atmospheric conditions and high altitude that might explain the dyno a bit. SAE correction would give you something more comparable.

That aside the mph still seems low even compared to the rwhp you are putting out and I don't think the TCS is the cause of it.

I'd sort out all the bugs and go and get it re-tuned, but if that shop didn't pick up on somethings it might be better to go somewhere else.

I don't have loads of experience here, but I don't personally think running the injectors at 105% duty is a good thing.

This is a total guess - but Dynojets are inertia dyno's, these means they have a big static weight that the car turns via the rollers. This means it can't properly load the engine compared to a Mustang Dyno (or any Eddy currecnt dyno) or even simply driving the car. It might be that in reality your fuel system is not up to the task at higher rpms, espcially in the higher gears. So going down the 1320 is causing it to falter but sadly its not truly being represented on the dyno.

I've had something similar happen with one of my vehicles. It would dyno ok'ish, but take it out on the road and it ran like crap.

HaulinHawk

You need a bigger inj and a retune.No way you should be runnin those #'s.

TCW

iTrader: (3)

Hmm, my ls6 intake came from an '02 Z28 and came with the fuel rail and I believe injectors. If I recall correctly those are 28lbs on 98/01/02 years.

Imma get it dyno with those and check the fuel pressure.

Also I am pretty much sea level and the graph is SAE corrected.

Imma check th one plug I did replaced that wasnt getting spark at the track and see if its lean.

HaulinHawk

My stockers were maxed out even before the 90/90 went on,and im cam only,you have heads also.You will need a bigger inj!!!!!

TCW

iTrader: (3)

Nah no heads, but I am looking at replacing them.

I checked the one plug I replaced and it is lean as well now in 50 miles, I also threw a P0121(TPS) and am going to look into that and see if it could cause me to run lean.

HaulinHawk

Ooops ,sorry i thought u had heads too!!!!Still need inj though.