frustrated after returning from the track tonight

[hotairgypsy]

well i took the car to the track to run it with the 4r70 installed. I know it is a new learning curve but i am dumbfounded by what happened tonight. Here is the short version

2000 MSD....PASS 1.........12.082.........1.670 60'......116.27 MPH........6:31PM
2000 MSD....PASS 2.........11.828.........1.678 60'......116.09 MPH........6:35PM
2000 MSD....PASS 3.........11.698.........1.679 60'......113.69 MPH........6:42PM
2000 MSD....PASS 4.........11.741.........1.694 60'......115.44 MPH........7:43PM
3000 MSD....PASS 5.........11.851.........1.706 60'......114.27 MPH........8:01PM
3500 MSD....PASS 6.........11.959.........1.815 60'......114.09 MPH........9:35PM

ALL ARE TRANSBRAKE LAUNCHES


stall is 3200. as i turned up the msd the slower my 60 foot got but the end game was about the same. I have no idea what this means. the last time at the track before the tranny swap i had put down 3 1.58 range 60 ' times trapping 11.6s. I would think the higher the setting the better the 60' time. The car was sticking well.

what do you all interpret these time to mean?????????????

 

[06BBR]

bogging out of the hole?

what cams / final drive ratio do you have?

are you sure you are not getting tire spin?

did you check to see if your tire spun on the rim?


manual has a better 1st gear so you might have to change your gear ratio to make up for it. Just a guess and come out harder. hope the stall speed is matched well with your combo.

 

[PNR Welding]

well i took the car to the track to run it with the 4r70 installed. I know it is a new learning curve but i am dumbfounded by what happened tonight. Here is the short version

msd 2 step setting 60' time trap speed et
==========================================

2000 1.67 115 11.697
3000 1.71 116 11.798
3500 1.80 114 11.956


stall is 3200. as i turned up the msd the slower my 60 foot got but the end game was about the same. I have no idea what this means. the last time at the track before the tranny swap i had put down 3 1.58 range 60 ' times trapping 11.6s. I would think the higher the setting the better the 60' time. The car was sticking well.

what do you all interpret these time to mean?????????????

Hey Frank, sounds like my story when I first switched to the 4R70W.

Did you by any chance switch from a stick to the 4R70W?
If so, you have to have your tuner turn off your transmission sensors totally. No communication to the ECU from the trans.
That worked for me and I picked up 2 tenths on the 60'.

 

[hotairgypsy]

bogging out of the hole?

it seemed to be sticking nicely...i have to review the tape

what cams / final drive ratio do you have?

stock cams but running 4.10s on the backside

are you sure you are not getting tire spin?

it seemed like i got a little at the 3500 setting but i had a friend watching from outside and he said it just planted and went.

did you check to see if your tire spun on the rim?

i did mark them so i will check in a bit and see if i spun them. It will pain me to drill bogarts to lock down the tires

 

[hotairgypsy]

Did you by any chance switch from a stick to the 4R70W?

the car was originally a automatic and i did have the tune modded. i assume all sensors were turned off. the guy that did the mods is the same one tuning GI Joes car and has done several 4r70.

 

[psfracer]

Well the stock 5R55S has alot steeper 1st gear, and one more gear to get down the 1/4--so I don't think its entirely unexpected. Maybe the converter is too tight? Loosen it up.

Also, my best 60' time of 1.412 was done off idle---it just seems the converter flashes better from idle for some reason.

I say the converter is too tight.

How was your mph vs previous runs?

 

[hotairgypsy]

here was my last run...see if ya see anything that stands out

http://www.youtube.com/watch?v=TW-Hb3tjDOM

 

[don_w]

here was my last run...see if ya see anything that stands out

The music sucks...

 

[hotairgypsy]

thanks don!!!!

 

[thump_rrr]

here was my last run...see if ya see anything that stands out

http://www.youtube.com/watch?v=TW-Hb3tjDOM

The music sucks...

You might also want to run a shammy over that dashboard.
It's really dusty.

+1 on the music.

 

[psfracer]

Yes, at the very beginning, you can see, it doesn't hit hard at all. Converter is too tight. When I first got my whipple, with an older converter, my car would do the exact same thing. It would creep out of the hole for the first 20 feet or so, then take off. My 60' times then were in the mid 1.7X's. Yours is looking like it is doing the same thing.

I then went with a PI converter, 3300 stall (actual---not just what its says on the box, as each converter will stall different in each car, depending on the gear and engine torque). My 60' times immediately dropped to low 1.5X's with a best of a 1.49. That was when my car was making 519 rwhp for your reference. Now my best is a 1.412 with 577 rwhp.

I can understand your frustration--as there is no way you should be turning only 1.7-1.8 60' times with a transbrake.

The reason why I asked for your MPH before vs after is to compare any difference in the converter (assuming all you changed was the trans and converter, no engine mods).

Also, when do you have your converter go into lockup?

 

[psfracer]

The music sucks...

You might also want to run a shammy over that dashboard.
It's really dusty.

+1 on the music.

You guys are killing me.........

 

[PNR Welding]

Hey Frank, like Paul was saying about the converter, can you post a pic of the dyno graph so we can see where the stall is?

 

[GI Joe]

Hey Frank, like Paul was saying about the converter, can you post a pic of the dyno graph so we can see where the stall is?

I dont know how you would see it on a dyno graph if the converter is locked as it should be.

That mph is WAY off That blower setup should be putting more power than that nearly 10 mph and was making more mph with the other tranny. I suspect its not locking right...did you get a single disk or multi disk converter.Who made it? how much did you pay for it.
that mph says the car is not putting the power or not making the power. Is it still 12psi boost?

 

[PNR Welding]

I dont know how you would see it on a dyno graph if the converter is locked as it should be.

That mph is WAY off That blower setup should be putting more power than that nearly 10 mph and was making more mph with the other tranny. I suspect its not locking right...did you get a single disk or multi disk converter.Who made it? how much did you pay for it.
that mph says the car is not putting the power or not making the power. Is it still 12psi boost?

He has Chevykillers old trans, and I thought he had a non lockup. I could be wrong but I remember somewhere reading on his trans being a nonlockup.

 

[psfracer]

Well it seems we three are in agreement that something is up with the converter.

I think he should take out the TCS converter and put it a multi disc PI

 

[hotairgypsy]

is there a break in on a TC. it was new when i put it in. do you think it is loosen it self up a little.

 

[hotairgypsy]

He has Chevykillers old trans, and I thought he had a non lockup. I could be wrong but I remember somewhere reading on his trans being a nonlockup.

you are right...i do have his old system and he did tell me it is non lockup. The TC i installed i got from him also.

 

[Dex]

WTF? music FTL

 

[US-1]

Non lockup. You're screwed. Less gear ratio than the 5R55S. You're screwed. That goddamned music. You're screwed.



I see a pattern here.................