I ran my all motor LS before with an LS tranny, stock clutch, stock flywheel, and stock cat and ran a 14.55 @ 97mph. Very respectable, and I was able to run mid 14's all day with similar trap speeds.
Since then, I installed an J1 (b16a) tranny, exedy clutch, ITR flywheel, and am now running a testpipe. I also stripped the rear of the car to the bone. I went to the track and could break into 14's. The car feels much faster in every gear, but the best time I could muster up was a 15.03 @ 90mph ...

Obviously I tried playing around with fuel pressure, cam timing, ignition timing, reset ECU.. The thing was is that I'm running a different short shifter than I had before, and my first run I couldn't even get the car into 2nd (first time shifting @ 8k on the new tranny/clutch). So 2nd run I jammed it into 2nd (I couldn't do it nearly as fast as I could with my old setup) and I slowly started improving my times.

The conditions were very similar, and DEFINATELY not big enough of a difference to set me BACK another 7mph @ 1/2 second. I'm figuring the much slower shifting is to blame as opposed to small little tunings here & there. Just wondering what you guys think... TIA

 

Not to be a smart *** or anything but you usually go faster when youre NOT in neutral....

Just my $.02

 

If you changed that since your 14.7 run that could be your problem."Tuning"isn't really "tuning"unless it is done on a dyno.

 

I had richened it up a little to be safe on the streets and advanced the intake cam a little more, but i set everything back to the way it was when I ran the 14.55. I don't think thats my problem.

 

What gear and rpm were you in when you ran the 14.55. If the trans gearing is not the same it can change your times and mph.

 

I was still in 3rd because 8000rpm on my LS was around 97mph. My problem was I couldn't GET to 97mph so I actually JUST shifted into 4th 15 ft before the finish with my new short geared tranny.

 

97 mph is a little high for an all motor ls. If it was in a hatch body, I understand but in a g2? It might be all motor but you are def runnin more compression, cams and ecu since you said you are shifting at 8k. A short shifter should not slow you down half a second, but the tranny could of hurt your mph.
EVIL