Ok I have a 1st gen CRX with a B16 w factory lsd and Exedy clutch. The car weighs 1980 lbs with me in it. It has a slightly milled head, AEM CAI, 2 1/2" exhaust comes out in front of the passenger side rear tire, stock cat, DC 4-2-1 header, 5-30 synth oil, 750 ground control springs in the rear, corner weighted to RF-620 LF- 720 RR 320 LR 320lbs. 33% of the cars weight is over the rear axle and 67% front. I ran a 15.1 at 90 mph 1/4 with 2.3 60ft time in 75 deg weather and about 4,800 ft elevation the time before last at the strip. This was at 2,040 lbs with me in it and no header, regular oil, crappy 16 yr old rear springs. I should have gained power and I lost 60 lbs vehicle weight. Last Friday at the track the best I could do was 15.2 even though the air temp was about 60 deg outside. The strange thing is I got a better 60ft time. I nailed a 2.2 60ft. Go figure?? How did I get a better 60 ft time but worse et? Oh also both runs were on 5 year old all season stock tires size 185 60 R14. The car feels faster even but I got a big surprise at the track with such a slow time. Here is what I think I am doing wrong....

I have seen some dyno charts of similar setups as mine and the 1st gen B16 runs out of steam at 7,500-7,600 rpms. Actually the power curve just goes flat after that. I have been shifting at 8,100 or so. If I am spending time from 7,500 to 8,100 but not making any more power would I be better off shifting at 7,600. I have a Zdyne ECU which allows me to go up to 8,500 rpm. The power really feels flat above 7,500 in the car as well. Should I shift at 7,600 is my question.

Also FYI I have gone to great pains to make this car light. I have a homade lexan sunroof, all lexan hatch, carbon fiber hood since nobody makes these for a 1st gen CRX and absolutely no interior but radio, two speakers, dash and drivers seat. I also have the rear bumper supprt taken out and some 2" holes in the rear bumber cover. This car should be faster than it is. I know tires would help but please answer my shift point question. Another thing is my tranny is cable and 4.2 final drive which sucks.

 

i have no idea how u lower the 60 and lose time in the end.......makes no sense, u got me...u dident miss or go from 3 to 5 or anything.....stumped over here

 

I think my time should be mid 14's though.

 

were you trapping the same speeds as well?

 

why don't you just try shifting at 7600 or so? You'll probably fall out of VTEC each shift...so it might not even improve much.
oh yeah...get some sticky tires and launch that bad boy

 

oh yeah....

when you say stock cat....is that stock CRX cat, or stock b16 cat?

If it's CRX....that's a HUUUUUGE bottleneck!

 

BTW, dude...

at sea level your 15.1 run would equal a 14.2 @ ~95 or so