1998Z20what?

iTrader: (4)

Anyone running a performabuilt convertor? if so does it need to be locked in order to achieve or get back your trap speed? I was going 110 then after i put the convertor and tranny in im only getting 105mph in the traps. PCMFORLESS told me that Its possibly because it needs to be locked, so just looking for input or if someone who has ran performabuilt had this problem and what they did to correct it.

performabuilt

iTrader: (25)

What size stalll do you have and what name was it ordered under ?

1998Z20what?

iTrader: (4)

It was ordered under Daniel the stall is a 9.5 inch, 3400 stall convertor. Thanks for the quick reply Frank.

BTW just to clarify, In no way shape or form am I complaining about performabuilt, very proud of the service and product I have received, im just not that educated on convertors thats why im asking these questions.

performabuilt

iTrader: (25)

Ok I see you have a 2.1 str efficency will be a little down but should hit hard in the bottom. You could try locking at the top after the 2-3 shift and see what happens, Do not lock before the shift .

1998Z20what?

iTrader: (4)

Alright I will give that a try. Thanks. What would have been a better solution to avoid this problem? does the STR ruin that??

performabuilt

iTrader: (25)

a lower STR would have has less loss up top but at asacrafice of hit at the bottom.

1998Z20what?

iTrader: (4)

alright Ill give it a shot and see what i can do.

99Hawk262

iTrader: (19)

It's not uncommon at all to lose MPH when adding an aftermarket converter. 5 MPH is a little high IMO, but I wouldn't worry too much about it. Did you gain ET? That's what counts anyway!

1998Z20what?

iTrader: (4)

umm i went from a 12.9 to a 12.8 lol. from a 2.3 60' to a 1.8 60'.

BobDoLe

iTrader: (11)

did you have it tuned for the stall? what rpm is it shifting at? hitting rev limiter?
at the top of 1st or 2nd, just going by hptuner logs and watching converter slip and rpm, it looks like my 3600 2.5str is 93.5-94% efficient.

oh.. and how much are you selling the car for?

1998Z20what?

iTrader: (4)

I was selling the car for 8k if i get that ill let it go, but if not im gonna keep it. I had the car tuned with stock tranny and convertor. only mods it had was full exhaust and lid. Now it just has the addition of a 9.5 inch stall and level 2 tranny. Doesnt bounce rev limiter or nothing like that it was well into the rpm range when it was shifting.

1998Z20what?

iTrader: (4)

i may just go get it retuned, im talking to a few tuners here today and they are thinking it needs a retune for that stall, becuase with a 1.8 60' they said its not a bad stall convertor and since i tuned with a stock stall this may have thrown it off.

MikeG

iTrader: (33)

Hopefully the tuning fixes it, something is definitely amiss.

jay_lt4

iTrader: (4)

something does not sound right, you should have gained more than .1 sec in the 1/4 mile going from a 2.3 60' to a 1.8 60'

GT Griller

iTrader: (8)

I wouldnt say that just right away.....unless he swapped converters in 10 minutes at the track on the same day he ran 12.9 on the stock stall...to many variables....i think u need to make a few more passes and hope for the same weather/track conditions as u had on ur stock stall pass.

BobDoLe

iTrader: (11)

he had a tune before the stall where the tuner probably raised the rev limiter. who knows what his shift points were programmed at that point on the stock stall/tranny.
although he says he wasn't hitting the rev limiter, for sure his auto is shifting way too late.
like he said:that's gotta be worth some sort of loss at the track.

1998Z20what?

iTrader: (4)

ya he did raise the revlimiter. and when i ran the 12.9 it was june here in Florida so humidity and heat were at the max. When i ran the 12.8 it was 50-60 degrees out from a cold front. I think the final solution is getting the whole thing retuned..the car sounds to healthy to be losing 5mph and that is a big loss so something would be noticable even under everyday driving. so Im gonna fiddle with the computer and see what the tuner can find.

DKITCHEN

iTrader: (10)

It's definately the tune. I had mine retuned after a 3000 stall and it made a huge difference. I didn't realize it initially because the bottom end with the stall felt so strong but it was definately way off with the shifting until after the retune. I ended up knocking off 3 tenths in the 60 foot and almost .5 tenths in the quarter mile in similiar weather with the 3000 stall with only an Air lid and drag radials for mods. My trap speeds were only about 1mph faster though.

1998Z20what?

iTrader: (4)

cool man, and i just realized something else and i feel like a dumbass for it, i went from off road x-pipe dumps, to a pacesetter y-pipe, im wondering if that is constricting the top end of the car aswell. But to everyone here thanks for all your support and help.