blocc monster

Hey guys wit to track today car ran 11.733 at 115.65 1.753 60'. the problem im havin is two months ago the car ran 11.61 at 117.98 1.83 60'. I did go from ss3600 to ss4000 because people have said i would be faster. Weather was better and all today y am i slower wit a better 60'??? And y did i lose 2 mph???

blk/slvr02ss

iTrader: (21)

Looks like u should have stuck w/ the SS3600 !

blocc monster

but y the slower time????????????

SCott5

iTrader: (40)

how did your 1/8th mile time and mph compare?

BigB02Z28

There are probably 100 different factors that could contribute to that. One could even say that the better 60' led to a lower MPH, but I haven't a clue about your E.T.

Wish I could help, Goodluck.

blocc monster

My 1/8 et the same but lost 1.4 mph Wat else could it be? I starting to think the stall is slipping to much I dnt no how somebody's got an answer

BAIN

iTrader: (5)

Shift points may have changed with the looser converter?

blocc monster

Is that possible??

BAIN

iTrader: (5)

Did you notice it tapping the rev limiter any during shifts?

blocc monster

No not at all

Minshall

Did you re-tune the car for the larger converter? Post up the 2 times slips for comparison. Like others have said, could be a number a different variables playing a role. What was the DA on the day of the 11.61 pass compared to your 11.73 pass? Just because it might have been cooler, there might of been a larger amount of moisture in the air. Lots to take into consideration.

blocc monster

I'm on a cell phone so a lil hard to post slips. No the car was not retuned, but everybody was running pbs da was -600.

NHRAFORMULA00

iTrader: (2)

You really need to LOG runs with a laptop, to be able compare times and possible slipage. You def have a problem somewhere,bad fuel,Pulling timing, converter slip,ect.

blocc monster

How do I log runs?

NHRAFORMULA00

iTrader: (2)

Laptop with HPtuners software.See exactly where it is shifting at, and how much it drops after the shift.700-800 rpm is good( tight ), 1000 or more is loose depending on rear gear ratio. I see your are full weight, 200-250 lbs,less will really wake your car up.

blocc monster

That's alot to take out the car, Wats the best way to loose 200 lbs?

1Bad97WS-6

iTrader: (3)

even though you didn't retune I would get it tuned again.

redtan

iTrader: (5)

Why? What would need to be changed in the tune given the change from a 3600 to a 4000 stall with everything else staying the same?

A simple stall change (aftermarket to aftermarket and close speeds) does not require a new tune. You're not putting in more air that would require more fuel/different timing. Your max RPM is not going to change, so the shiftpoints don't need to be altered.

A tune is not going to get you squat if the car was tuned perfectly with the 3600 stall.

Like others have mentioned, something else is at fault here. My guess it something up top causing you to lose power. The fact that your 60' went down goes to show that the stall is doing its job correctly, but something else outside that domain is losing you power such as knock or bad fuel.