borat

Finally got around to heading to the "local" dragstrip (only 75 miles away), and damn did my times suck. Here was my best run:

60 ft - 2.36
1/8 et - 9.69
1/8 mph - 74.09
1/4 et - 14.99
1/4 mph - 92.61

After looking at a few timeslips of other JRSC ludes, my 60 ft isn't too bad, but my top end is just crapping out on me. Datalogs show my IAT going from 140 F at the start, up to 163 F at the finish. Boost is solid 6-7 psi until about 6k, then it slowly drops to about 4.5 psi at redline. AFRs are good. Shifting at 7400 because the top end just isn't pulling any more. I want to blame it on the heat, but I don't think that totally explains why my 1/4 is about a half second slower than it should be. Any ideas?

Eddiebx

yeah ur right, that is pretty damn crappy times. looks like ur running out of steam up top. have you gotten the car dyno tuned, or atlesat some street tune runs to see how the AFR sits?

hamadiscool

ur 60's are bad! Stock 5th gens or little bolt ons have 60s like those.

Maybe u just need practice?

Good luck!

Giant_Bean

belt slipping at higher rpm? I have heard a lot about that with the JRSC

vinuneuro

I'm guessing you're tuned if you're datalogging. ^ is right about the belt slipping at higher rpm, that could very well be it.

borat

Yes, I've street tuned my car fairly extensively with crome. My AFRs are actually pretty aggressive, between 12.8 and 13.2 at WOT. My timing is also fairly aggressive at 25.75 at WOT. Need to get on the dyno to tune the ignition I guess, and find out what's happening up top. Perhaps it's because I just added the charger, and haven't put on an intake or exhaust yet? The midrage is definitely making good power, it's just the top end feels almost like stock... and even if the belt is slipping, it's still at 4.5 psi, which should yeild quite a boost over stock power.

esedulerp5tenin

you could work on your 60'

how hot was it that day? humid?

jeremiah87

get a good i/h/e and see if that doesnt help a bit. i guess i figured that you should have already done that stuff..."bare essentials"

M2B4

yeah ive hit 9.6 1/8 in my lude with a slipping clutch with ebay i/h/e. i know its only 1/8 but thats the only track i got here.

plikit

your problem is whatever is causing you to lose boost.

it should stay 6-7psi the whole time.

sure you could work on your 60'.. but troubleshoot the jrsc first.

98vtec

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by borat &raquo;</TD></TR><TR><TD CLASS="quote">Yes, I've street tuned my car fairly extensively with crome. My AFRs are actually pretty aggressive, between 12.8 and 13.2 at WOT. My timing is also fairly aggressive at 25.75 at WOT. Need to get on the dyno to tune the ignition I guess, and find out what's happening up top. Perhaps it's because I just added the charger, and haven't put on an intake or exhaust yet? The midrage is definitely making good power, it's just the top end feels almost like stock... and even if the belt is slipping, it's still at 4.5 psi, which should yeild quite a boost over stock power.</TD></TR></TABLE>

get on a dyno and do your timing. Just because that is what is on the map, doesnt mean that is what the engine is seeing. Not to mention that i dont trust the ignition in crome to give me an accurate reading. Are you running a boost retard?

i would imagine that your exhaust is hurting you alittle, but not enough for you to be running 4mph slower than my stock internal NA h22a.

I would also imagine that your traction is horrible. Get some slicks or drag radials and go back out after you get it dyno tuned.

IMO there is no point in drag racing with street tires when you are testing the limits of your car.

Wsteun

Something is seriously wrong. I knew someone who ran 13.99@101 on a JRSC Car with I/H/E. Your 60ft time even with the JRSC alone is good enough to get low 14's. Your trap speed is horrible though. I've trapped 92.6X on my car and all it had was an intake.

& I don't think it's heat related.

ralpheezy

what's your suspension and tire set up like?

i got faster 60 foots in my i/h/e h23 and the car was on eibach sportlines, koni yellows, and falken azenis. i only ran 15.5 though.

JBirch_97Prelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by borat &raquo;</TD></TR><TR><TD CLASS="quote">Finally got around to heading to the "local" dragstrip (only 75 miles away), and damn did my times suck. Here was my best run:

60 ft - 2.36
1/8 et - 9.69
1/8 mph - 74.09
1/4 et - 14.99
1/4 mph - 92.61

After looking at a few timeslips of other JRSC ludes, my 60 ft isn't too bad, but my top end is just crapping out on me. Datalogs show my IAT going from 140 F at the start, up to 163 F at the finish. Boost is solid 6-7 psi until about 6k, then it slowly drops to about 4.5 psi at redline. AFRs are good. Shifting at 7400 because the top end just isn't pulling any more. I want to blame it on the heat, but I don't think that totally explains why my 1/4 is about a half second slower than it should be. Any ideas? </TD></TR></TABLE>

What intake are you using? If you are using a Stock 1999 Prelude, the P28 ECU does not allow you to use your Secondary intake runners.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by borat &raquo;</TD></TR><TR><TD CLASS="quote">Perhaps it's because I just added the charger, and haven't put on an intake or exhaust yet?</TD></TR></TABLE>

What do you mean by charger? Super Charger?

98vtec

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JBirch_97Prelude &raquo;</TD></TR><TR><TD CLASS="quote">

What do you mean by charger? Super Charger?
</TD></TR></TABLE>

yes, he has a JRSC as stated.

JBirch_97Prelude

Something is wrong? I hit mid 14's with my set up.

98vtec

lol, we already know something is wrong.

JBirch_97Prelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">lol, we already know something is wrong.</TD></TR></TABLE>
Ofcourse! Maybe it's his driving or the way he is tuning his P28!

98vtec

well its not his driving. Even with a bad ET his mph should still be MUCH higher.

Pullig

thats horrible man .... my 4th gen with h22a with just bolt ons ran 14.5 @ 95 with no traction out the hole.. like 2.2 60 fts

borat

My best 60 ft that night was 2.28, with a 15.00 et. Something's definitely wrong up top, since that 60 ft time is pretty much spot on for this setup. I'm inclined to think that no one has run a JRSC by itself, without any other mods, and that's why I'm running out of steam. I'm aware of the timing issue with crome, and I've been waiting patiently for eCtune, but it seems to still be "coming very soon", even after 4 months of the same talk.

As for running drag radials, I want to see what my car can do with all other factors excluded. That includes drastic weight reduction, removal of AC or PS, or using special tires. Most other JRSC timeslips I've seen have been in the 14.1 - 14.2 range, with no mention of slicks/radials. If I wanted to hit low 14s that badly, I'd have just slapped on the slicks and forgotten about the SC altogether. Thanks to all who've actually read my post/setup so far and contributed useful info... I guess the next step is the dyno and some bolt-ons!

Edit: Also, not to take the easy way out or anything, but it was hot as ***** that night. New Civic SI's were pulling 15.2's, and everyone knows those should do mid-high 14s from the factory

Wsteun

I honestly think the bolt ons would have a minimal effect on your car. There's another, bigger issue. A stock 5th gen traps what you trapped. You should be wayyy higher.

HybridBB6

Wow those are crappy times. About your boost dropping make sure your belts are tight on your JRSC. Next time try to get some slicks or something for the track. I ran a 15.3 with a 2.4 60' time and trapped at 94 mph on bald Kuhmos.

DCxMagus

the IAB would be blown open by the boost but it wouldn't hurt to disconnect them if you haven't already.

are you running with a stock exhaust?

could it possible be that with the stock or whatever header/exhaust you are running you just can't expel the gases fast enough and in the high end and in VTEC you are losing boost pressure because of that?

because if the belt was slipping wouldn't the boost just fall off instead of slowing decreasing?

machine4321

i think your AFR is way to high ,

my na f20b runs best around 12.9-13.1

i tihnk your loosing some power due to runnign to lean,

have you checked your plugs out ?
id say that along with slipping belt