dicky98z

iTrader: (2)

my car is a bolt on LS2, 6 speed auto with a yank ss 3600 and 3.42s. The car makes 361 on a motor and 414 on the 75 shot and 526 on the 150 shot.

The short version
Yesterday i was running 7.16 @96 with a 1.56 60' on motor, when i sprayed the 150 shot i was only running 6.80 @98 with 1.45. After several tries i dropped down to the 75 shot and was getting 6.92 @98 with a 1.51. Would converter blow through be causing such little gain?

More detail
I been having trouble with the trans shifting so i went out and did some street pulls the other day and got it to shift great (bottle pressure was low for these pulls). When i get to the track and try the 150 shot it hits the limiter again (bottle pressure around 950 to 1000). I had to drop the shift points quite a bit to get it close. I scanned every run and the rpm drop after the 2-3 shift acts odd on the spray. It will flare just a tad right before the shift then after the shift it will drop from 6400 to 5500 like normal but then it jumps up to 6050 right away then drops again to 5450 and rises like normal from there. I had the window switch set to shut off at 6000 on these runs.

On the 75 shot it seems to do almost the something but i don't look like its flaring at all on the shift but it still does that weird rpm jump after the shift but not as bad. On the 2-3 shift it would drop from 6300 to 5250 then jumps to 5730 and drops back down to 5350 and rises like normal.

I'm hoping its as simple as converter blow through because I was already considering changing converters this summer.

Any help is appreciated

dicky98z

iTrader: (2)

Here's a scan of the 150 shot run. Ignore the knock, it's my exhaust hitting on the launch. The 2-3 shift is what looks weird with that jump in rpm right after the shift.

JDMC5

iTrader: (3)

looks like the trans is acting up to me

dicky98z

iTrader: (2)

maybe, i was planning to have the trans, converter, and gears refreshed/swapped this summer so if it is it isn't a big deal. the trans acts fine on motor but maybe after 5 years of beating on it the clutch packs have got worn down and don't like the spray.

JDMC5

iTrader: (3)

if it's fine on motor then I'm gonna have to say it's the tune. Should have it looked at

1970camaroRS

iTrader: (8)

If you were blowing through the converter, you'd see a massive disparity between the RPM curve and the MPH curve in 1st gear. Your 1-2 shift looks normal too. If it was the converter, you'd see an RPM flare after the shift there too. Your 2-3 doesn't look like converter since the RPM drops again after flaring. It looks like you've got a clutch pack that's dying.

QucikSilver

iTrader: (4)

I second that. And remember, that a nitrous shift is always going to be a lot harder on a trans than a N/A shift, so if you have a clutch pack going, you'll be more likely to feel it on spray

dicky98z

iTrader: (2)

That makes sense since it only does it on the 2-3 shift. Guess I'm going to have to hold off on testing it until I get everything looked at this summer.