well since we have many stickies about na builds, turbo builds, h23vtec builds.we haven't really had a heated discussion about launching techniques. by far the most important part of racing.

i myself am having troubles launching. usually varying between 4400-5100rpm clutch drops on kumho ecsta supra 712's. best 60 foot to date is a 2.31 at 22psi in the front tires. lately my local track has been a little hard to launch on and i am dying to get into the 14's with my setup. ( having 10 15.0x timeslips is killing me). i haven't really tried slipping the clutch at all. and i'm just looking for ways to break the 14 second barrier.

what are your idea's?

how do you launch?

what has been your best technique?

 

well honestly i have no idea how to launch, but i bet these guys do.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Honda-Tech.com &raquo;</TD></TR><TR><TD CLASS="quote">Drag Racing
Discussion of modifications, tuning, and driving techniques - drag racing</TD></TR></TABLE>

maybe you missed it or somethin..its just that we actually have a place just for this sort of thing, the drag racing forum.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMlude92 &raquo;</TD></TR><TR><TD CLASS="quote">
i haven't really tried slipping the clutch at all</TD></TR></TABLE>

try slipping the clutch

 

I've got the same tires. You may want to lose your passenger seat, spare tire and tools, and slip the clutch gradually until the tires grab then drop it. Sounds like you were getting a little too much wheel spin. You should be able to get down to around 2.2's on your 60' times with that setup. I would think that combination would get you into the 14.9's or better.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMlude92 &raquo;</TD></TR><TR><TD CLASS="quote">well since we have many stickies about na builds, turbo builds, h23vtec builds.we haven't really had a heated discussion about launching techniques. by far the most important part of racing.

</TD></TR></TABLE>

most important aspect of DRAG racing...

hehe sorry just being an ***.

 

i slip the clutch, at about the same rpms as you. you try launching harder and harder till you see where you lose traction w/your setup.

 

yeah feather the clutch then gun it when you grab
and do some situps, j/k

 

sorry. i know that there is a drag racing forum. but i felt it was more suited for preludes. considering i'm looking for specific advice about launching and a lot of people int he prelude forum have the same setup. i don't think someone with a crx with a b16 would be as much help.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMlude92 &raquo;</TD></TR><TR><TD CLASS="quote">i'm just looking for ways to break the 14 second barrier.
</TD></TR></TABLE>

with a 2.3' and a CAI, and 4th gen VTEC should be into the 14's no problem. whats your trap speed?

 

sig.....

 

i cant seem the bust into the 14's either... then again, i do have a full street car. that is full interior, tools, and 2 - 12" subs and box in the trunk.
i still need to get a few more bolt ons... im confident in being able to run a 14.xxx

 

Yeah the previous owner of my lude ran a 14.7x @ 95.x w/ the USDM H22a1 and CAI/H/E on Dunlop SP5000 High performance "all season" tires.

I unfortunately haven't run it myself as the closest 1/4mi track is like 3 hrs away!!! Oh yeah AND my CRANK PULLEY is wobble-ing it self off and my car is awaiting some serious fixing...

But yeah... w/a better launch you SHOULD break into high 14's (not that I can really talk...YET )

Good Luck

 

What kind of rims are you running?

I pulled a 15.5 in my stock SH (rims and tires included) @ a 3500-4000 rpm clutch drop. I plus sized the rims and got some stickier tires thinking the rims were lighter and tires would help traction.

I went to the track last week and the best I could manage was a 16.0. I couldn't believe those rims added half a second, even with a 5000-5500 rpm drop.

Time for some lighter rims... (me)

EDIT - You might also try putting air in your tires, if you are using reinforced radials. When the air pressure is too low, you will just be making contact with the outside edges of your tires. I ran 44 psi in my tires (205/40/17), and didn't have any problems with grip...just rotating mass.

 

i have gotten my best 60' of 2.2 on stock bridgestone potenzas by lowering pressure down to 20psi, doing a small burnout before staging to warm up the tires and released any small rocks lodged in the tires and i launch at 3900rpm- when the third amber lights up i dump the clutch but keep the gas pedal in the same place and allow some spin and just as the tires begin to hook up in hit the gas completely and usually this gets the car off to a good fast start.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LowFlyin' &raquo;</TD></TR><TR><TD CLASS="quote">What kind of rims are you running?

I pulled a 15.5 in my stock SH (rims and tires included) @ a 3500-4000 rpm clutch drop. I plus sized the rims and got some stickier tires thinking the rims were lighter and tires would help traction.

I went to the track last week and the best I could manage was a 16.0. I couldn't believe those rims added half a second, even with a 5000-5500 rpm drop.


Time for some lighter rims... (me)

EDIT - You might also try putting air in your tires, if you are using reinforced radials. When the air pressure is too low, you will just be making contact with the outside edges of your tires. I ran 44 psi in my tires (205/40/17), and didn't have any problems with grip...just rotating mass. </TD></TR></TABLE>


Yeah I have recently learned just how much UNSPRUNG WEIGHT OWNZ!!!

4 cylinder Engines typically don't respond well to larger rims and/or heavier Wheel/tire Combos...so I would recommend running the STOCKERS unless you can get super light ones.

I wanted to plus-size w/lightER rims and lower-pros BUT apparently the lower-pro rubber is significantly thicker and or denser and heavier than the stock rubber (even though it SEEMS like there is LESS rubber and SHOULD be Lighter - but its NOT)

So until I get alot of extra HP/TQ I think I will stick with the stock 4th gen sawblades (15x6.5in @ 17lbs?) and maybe have them repainted/finished/powder-coated eventually to combat Maine Winters as well as general wear & tear. OR get some lighter 15's by 6.5 or preferably 7in.

 

JDMLUDE92- if you got a 2.1 60ftr before then
you should hit 14's the next time you go,
have you ran it at the track since you got your vafc

 

Go find a big empty parking lot or long strip of asphalt where nobody is around.

Practice different techniques for coming off the line, and then when you find what you think is best, practice being able to do it perfectly every time.

Myself, I launch at about 4k, but I let about half the clutch out, and then ease it the rest of the way while putting my other foot down at about the same ratio.

When you get real good at that you can sit at a stop sign, and then have your tires chirp only when you hit the paint for a cross walk. Thats how I do it, although the double chirp is tough. :-) Too much gas and you chirp between the lines, too little and you wont chirp on the second line.

Grape

 

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

So until I get alot of extra HP/TQ I think I will stick with the stock 4th gen sawblades (15x6.5in @ 17lbs?) and maybe have them repainted/finished/powder-coated eventually to combat Maine Winters as well as general wear & tear. OR get some lighter 15's by 6.5 or preferably 7in.

</TD></TR></TABLE>

I'm looking at some SSR Competitions 17x8 (14.5lbs), but the tires (225/45/17) are 20lbs, and I don't know if I can fit those under the fenders.

You might check out Kosei Racing (TireRack) they have their K-1 in 17x7.5 (16lbs) for $179/rim. I'm sure the 15x7(.5?) would be lighter.

 

best so far in my car is a 2.19. i did an easy launch but it hauled out of the hole. but i fucked up my 3rd to 4th shift somehow and nailed the brakes and went 15.3@72mph. my trap speeds range from 92.2-94.3. avg 60's are 2.31-2.41.

also i'm running the stock 92 si wheels.

 

i'm sure those 15inch kumho 712s aren't helping either, they are not very sticky.

 

I would say just go with some nice tall slicks for a 15" wheel. That will get your 60' times down a lot as long as you can drive and warm up the tires properly.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ludenutz &raquo;</TD></TR><TR><TD CLASS="quote">I would say just go with some nice tall slicks for a 15" wheel. That will get your 60' times down a lot as long as you can drive and warm up the tires properly.</TD></TR></TABLE>

slicks would be a little overkill for the power he is putting down, some nice sticky tires like fm901s or azenis should provide enough sticky.

 

Yeah,

You're right actually. I was basing him almost on my setup which includes a 55 shot of laughing juice.