how much can a torque converter thats to tight effect you et at track

[bttwracing86T]

got my converter back and car seems awesome just wondering what kinda et changes my come. I still pulled a 1.6 sixty ft at track but took 10 seconds to get it to build 8 psi launch before it was loosened up. just hoping someone knows or has idea I do know I held 13 psi on street before spinning so my launch should be amazing

 

[Dusty Bradford]

There's no set number that you can go by. Too tight IMO means its keeping the motor pulled down to far in its power range. There is a difference in tight and to tight. With one that is way to tight I'd expect a couple tenths gain from the proper stall.


Posted from the TurboBuick.Com mobile app

 

[bttwracing86T]

ok cool thanks dusty

 

[ijames]

If the converter is too tight your et will suffer but the mph will still be pretty accurate for your hp. The average regal runs an et of 1356/mph, within about 2 mph or .2 sec, so if you run a 12.4 at 101 mph, 1356/101 = 13.43 and you ran an amazing et for the mph . I know you had trans problems, just wanted to show the math. Compare the calculated et with your actual et and if they are close the converter can't be much too tight.

 

[bttwracing86T]

bottom line I need to get back to track I went to a very crappy track as soon as trans was done but converter was to tight car went 7.9 at 93 mph then fixed brakes and all went back and ran 7.4 at 88 makes no sense to me may have had a bad sensor or something at the track my buddy has a 3-4tenth slower car at that specific trac compared to others. very weird but I need to run it again I need a 6.8 pass

 

[Turbo Negro]

My car went quicker with less mph, too when I switched converters. The quicker your short times the less mile per hour you will see at a given horsepower in a given distance. The mile per hour will go back up when you start adding more power. The fact that it went down doesn't mean you're making less power, or that the converter is too tight. It just means that the car didn't have enough time to get to the same mph because you got to the 1/8 mi mark sooner.

Edit: I forgot to add that your average RPMs were probably higher as well.

Edit 2: Maybe the cam has something more to do with it spooling up slowly on the brake? I'd like to hear some more thoughts on this idea...

 

[bttwracing86T]

well as soon as I get it to the track ill let you know aaron. I can surely tell a difference in spool time since dave loosened it

 

[we4Mateo]

You def lose mph when the sixties start coming down just like turbo negro stated. That's when you know you're maximizing the combo.

 

[3.8L V-8 eater]

I get confused with this!!
I went to the track last night and went 11.00 at 125.97 MPH with a 1.744 60ft...Next pass was 10.8 at 126.14 MPH the 60ft was 1.587 I gained slightly in MPH with the 60ft coming down 2 tenths...
My buddy was at the track last night and went 10.9 with an almost identical 60ft and trapped at 121MPH his previous passes were in the 11's worse 60ft and lower MPH same scenario as me???

 

[bttwracing86T]

new log what yall think

 

[ijames]

I get confused with this!!
I went to the track last night and went 11.00 at 125.97 MPH with a 1.744 60ft...Next pass was 10.8 at 126.14 MPH the 60ft was 1.587 I gained slightly in MPH with the 60ft coming down 2 tenths...
My buddy was at the track last night and went 10.9 with an almost identical 60ft and trapped at 121MPH his previous passes were in the 11's worse 60ft and lower MPH same scenario as me???

Ok, the average tr will et at 1356/mph so 1356/126 mph = 10.76 seconds. That means your 11.00 was off some, and the 10.8 was about what the average tr would run with that mph. As for your buddy, 121 mph would be 1356/121 = 11.2 so his 10.9 was way better than average for his hp and the low 11's more in line with what he should expect. Now if he can just figure out what went right on that 10.9 pass ...

This formula is good to within about 2 mph and 0.2 sec, so it is a guide, not gospel. The aerodynamics go into that number so for the same hp and et an f body will pull 2-4 more mph, and a pickup truck will be way down on mph - that 1356 is for g bodies and seems to work ok for a bodies.