I believe I have a converter slip problem. I keep calculating between 22-26% slip. Is this right? What am I leaving on the table?

26" hoosier QTP
7.53 et 1/8th mile
going through the traps at 5800 rpm @92 mph

Any help would be appreciated!

Thanks,
Austin

 

What does the RPM drop between gears?

 

The rpm hardly drops and then shoots right back up to 5k or so. When it drops it makes an odd tone (kinda like a VTEC would lol) and picks up rpm it sounds like it almost down shifts but it doesnt.

 

Use this calculator to determine % converter slip...
http://www.tciauto.com/Pages/418/calculators.aspx#4

 

What is a normal percentage range for converter slip?

 

Is this for 8th mile? Most ive seen are for 1/4

 

From what I have seen elsewhere on the board, around 4% slip unlocked is good.

Although you have to take into acount various converter slip and tire growth, the formula to tell what rpm you should be at for a given mph is. . . . . .

Mph x 1056 x trannsmission gear ratio x rear axle ratio ÷ tire height ÷ 3.14159 = rpm

(if the tire height was constant and there was no drivetrain slip)

 

Using the formula on TCI's website mine comes out to being around 11%. I thought that I may have had a slippage problem lately.

 

They say that 7-12% is normal in the 1/4. Mines sitting around 10-12% after I finally went to a 1/4 mile track.

Slip isnt always a bad thing. To much slip is. I spent a lot of time talking to ATI and Circle D on this thing. Im sitting alright. But when I spray it will be a different story im sure.

 

I have found that 9-10% slip performs best for me. Tighter effects short times and looser effects top end... I've pulled many converters over the years to get what I want out of them. I've moved to the bolt together converters now to make the necessary changes myself...