1/8th to 1/4 conversions????

[eiuskoalman]

can anybody set me up with a link to a 1/8th to 1/4 mi. conversion calculator? TIA, aaron

 

[EightSecV6]

Multiply by 1.557

 

[Taffy]

Originally posted by EightSecV6
Multiply by 1.557

Hey Bill, does that work only for the ET, cause I ran 87mph in the 1/8th, but I can not see running 135mph in the 1/4. Thanks, ERIC.

 

[BoostKillsStres]

You should be looking at about 111 in the 1/4 and something around 12.20 based on that mph and hookin good. And your correct, it only works for et. Most TR's pick up around 24 mph in the last 1/2.

 

[Taffy]

I was running the stock D5 converter and a T-61 at 25 psig boost. The tranny let loose on the run. I thin that if it ran 12.0@115 in the 1/4 that would be cool. It did not get full boost till the middle of 2nd gear.
My friend had a Typhoon. He ran 8.4@81, I was about to pass him in the 1/8. He runs 13.1@103 in the 1/4. I was gaining like a mo fo in the 1/8 though. Too bad I was leaving at vacuum, not boost. Till later, ERIC.

 

[Chris McDade]

I use 1.576 and it's pretty damm close all the time.

Good luck

 

[efi-street]

http://www.pontiacgroup.com/perf_tech_info/calc.html

enjoy

 

[EightSecV6]

1.557 is for the ET only, I am not sure but I think the NHRA uses the same number when figuring indexes from the 1/4 to the 1/8 (divide)