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View Full Version : What RPM is BEST to launch at?



KevinT707
03-21-2007, 03:58 PM
I'm looking to receive opinions and insight on this area because I've heard so many different things from different people and I would like to hear from fellow Drag Strip enthusiasts. This is more focused on the Honda/Acura people but whatever's clever!

My setup is an LS/VTEC making 174 WHP N/A weighing in at 2205 w/out me; VTEC engaging at 4700. Currently my lauch control is set at 4K and on my daily street tires (not DRs) they don't seem to spin too much IMO at this RPM. I'm yielding a best of 2.3-60' but it ranges from 2.3-2.5.

My question: How can I cut better 60', by launching at lower RPM or higher RPM (in VTEC; where there's a stronger powerband for Hondas), at what RPM and what clutch engage technique works best?
Same question for STREET, SLICKS and DRAG RADIALS.

Please share what has worked for you on your setup, Thanks! :goodjob:

2.3 Evo 8
03-21-2007, 05:03 PM
You can't figure it out by asking other people. You need to do a trial and error to find the optimum rpm and technique FOR YOUR CAR.

There are too many variables.(track prep/condition, suspension, tire pressure, rpms, etc...)

Silly roadrunner.

KevinT707
03-21-2007, 05:40 PM
You can't figure it out by asking other people. You need to do a trial and error to find the optimum rpm and technique FOR YOUR CAR.

There are too many variables.(track prep/condition, suspension, tire pressure, rpms, etc...)

Silly roadrunner.
:) Just figuring out what works best for cars with my similar setup so that I can get a ballpark figure and make adjustments accordingly.

Oh yeah, its hard to "figure out" which RPM is best also because on the ECU program that I'm using (Crome), unless you have the program on your computer + E-Prom Burner then you're out of luck till you meet your tuner & get them to edit your launch control RPMs .. :no:

Maniaç
03-21-2007, 06:13 PM
i launch at 4 or 5K... start from 2 and keep going higher until you find your sweet spot. :)

mike's02ls1
03-21-2007, 06:14 PM
Well front wheel drive is harder to get a good 60ft unless you have sticky tire's. Try starting at what you are use too and work your way down in RPM's. Like 2.3 EVO 8 said their are alot of variables that can play affect on how your car launch's. If all else fairs get a sticky tire like a DR of Slick, or trade the car in for a AWD or RWD vehicle.

green91
03-21-2007, 07:27 PM
Its not just about RPMs, other things come into play like how quickly/harsh you engage or slip the clutch, power, tires, track conditions etc. Personally id slip the clutch some close to your power band (near vtec engagement) and go from there. But sitting it on your 2-step limiter and dumping the clutch probably isnt the best launching technique.

Z0_o6
03-21-2007, 08:15 PM
when i raced you at SDR i had my 2-step set at 3k, which for street tires was doing pretty good. i would try going a hair lower than 4k because you would rather do a low rpm launch and stick than just burn out at the line, because all its going to do is blow the tires off halfway into 2nd, meaning when it catches you bog the shit out of it and actually slow down. i would try an aggressive street start and go from there.

KevinT707
03-21-2007, 11:35 PM
i would try going a hair lower than 4k because you would rather do a low rpm launch and stick than just burn out at the line, because all its going to do is blow the tires off halfway into 2nd, meaning when it catches you bog the shit out of it and actually slow down. i would try an aggressive street start and go from there.
I guess with the technique that I use it doesn't spin that much launching at 4, I slip the clutch, and feather it until I feel it grips in 1st then I smash it before shifting into 2nd.

I'll be trying some small slicks this Friday also so I'm thinking I might need to raise my RPMs for that .. ?

2.3 Evo 8
03-21-2007, 11:50 PM
I'll be trying some small slicks this Friday also so I'm thinking I might need to raise my RPMs for that .. ?

Or adjust tire pressure accordingly. Thats what I am trying to explain, there are so many variables to dial in a car. It's not just "throw on a set of slicks and go".

What about your suspension? Is it setup for drag racing?

KevinT707
03-21-2007, 11:53 PM
Or adjust tire pressure accordingly. Thats what I am trying to explain, there are so many variables to dial in a car. It's not just "throw on a set of slicks and go".

What about your suspension? Is it setup for drag racing?
Yeah you're right, they're are TOO many variables to take into consideration & no my suspension is not setup for drag racing. :no:

It sucks cause you can't get as many runs in as you want at Commerce nah mean? So it leaves minimal time to figure things out..

2.3 Evo 8
03-21-2007, 11:58 PM
So it leaves minimal time to figure things out..

Only a little time in an empty parking lot in a far off place in never never land. :D

KevinT707
03-22-2007, 12:00 AM
Only a little time in an empty parking lot in a far off place in never never land. :D
You know what though, every blue moon I try launching on the streets and it seems to grip more for some reason than at the track?

TIGERJC
03-22-2007, 12:08 AM
dont you want a little bit of spin of the tires in fwd cars

Init2winit
03-22-2007, 12:33 AM
Put it on the rev limiter.

Vteckidd
03-22-2007, 11:43 AM
10,000 rpms

Vteckidd
03-22-2007, 11:43 AM
You can't figure it out by asking other people. You need to do a trial and error to find the optimum rpm and technique FOR YOUR CAR.

There are too many variables.(track prep/condition, suspension, tire pressure, rpms, etc...)

Silly roadrunner.
yup

Vteckidd
03-22-2007, 11:44 AM
Put it on the rev limiter.
i love this guy :goodjob:

Vteckidd
03-22-2007, 11:53 AM
ok all kidding aside:

1) Street Tires (kuhmos, any DOT non drag radial tire)
2.2-2.3 is about the best you will see. I cut a 2.1 ONCE on some 711s but it was an act of god. Not really what you want to be running on at all, ESPECIALLY in a FWD car. my old 190whp GSR i was 2.2-2.3 consistently running 13.8-14.1


2) Drag Radials
Drag radials i would prob try 3500-4000 an slip the clutch. Without an LSD, it will be tough to hook up, maybe cut a 1.9-2.0. with that little whp, you cant cut a 1.6 etc on drag radials, i have never seen it. Turbo cars can do it, so can nitrous car WINK WINK

3) slicks
I have never run with slicks. so my information it limited based on what i have seen, helped others do, and discussions with people running slicks. On your car, i would run 22s, 24.5 is prob too big unless your on the bottle. ALL MOTOR you want to launch near the rev limiter, 7500-8000rpms, sometimes 9000 if you have enough power. But the problem is, you cant just Let the clutch out, you have to slip it or you will destroy axles an transmissions. you also have to learn how to do a burnout :)

If you search on honda-tech, there was a thread in the all motor forum called "what are your 60ft times/quarter mile/launching rpms"

the guys cutting 1.5-1.6 60fts were launching at 8000-9000rpms and had 220-240whp running 11.5-11.8s in a 1800-2200 lb chassis (civic/CRX)

but Phil is right, suspension setup plays a big role. if you have crazy weight transfering in a FWD car cause of your shitty suspension, 15 year old bushings, non lsd, dont expect awesome times. best advice i can say is buy some Skunk2 Drag Launch springs ($80 and 1100lbs) and some spare shocks. when you go to the track, swap those on, remove after the track. if i were you i would learn on drag radials before moving to slicks.

P.S. If you contact scotty he will remove launch control for you. hes here all the time, and sometimes makes housecalls. 678-614-3596

§treet_§peed
03-22-2007, 03:18 PM
You know what though, every blue moon I try launching on the streets and it seems to grip more for some reason than at the track? i do as well i have heard it is beacue of less rubber build up on the road than that that is all on the track.. taht's why if your running street tires at the track you tend to spin and bounce

Vteckidd
03-22-2007, 03:31 PM
READ
http://www.honda-tech.com/zerothread/1928442

§treet_§peed
03-22-2007, 04:04 PM
i'm to lazy.. notes plz..:D lo

KevinT707
03-22-2007, 04:45 PM
READ
http://www.honda-tech.com/zerothread/1928442
Preciate it homie, I'll be practicing all night on some BFG DRs and baby slicks to figure this thing out :goodjob:

93H22ACX
03-23-2007, 12:01 AM
there really isnt a magic number. you just have to keep keep upping the rev until u feel its "right"

but to keep on track...on street tries use a 2-step at 5500rpm and with slicks i stage at 7500rpm.

Nang
03-23-2007, 08:33 AM
try 3-3.5

§treet_§peed
03-23-2007, 04:50 PM
i gotta find my new sweet spot since i have changed alot on my car since the last time i drove it a year ago

fastasscrx
03-23-2007, 05:21 PM
HELL! ,lauch it at the highest rpm's you can get out of it, then play with the rev limiter! then when you shift to 2nd hit the NOS:goodjob: I always launched mine at 8k, BUT it had some 22.5's on it.

KevinT707
03-24-2007, 07:12 PM
HELL! ,lauch it at the highest rpm's you can get out of it, then play with the rev limiter! then when you shift to 2nd hit the NOS:goodjob: I always launched mine at 8k, BUT it had some 22.5's on it.
Preciate the tips but all I can say is BFG DRs @ 10 PSI wouldn't grip till 3rd on the bottle so I was slow for the first half of the track then at the end it'd move! . . 14.8 at 105 MPH :???: :gay:

Black R
03-24-2007, 07:31 PM
best rpm = 8500 and heat up those slicks and preload the clutch! :thumbup:

Extrememustang
03-25-2007, 01:18 PM
My first time at the drag strip with my altima I messed up. I had it reved to luch cause I didnt know. The light turned green and the integra took off and Im smoking tires like a sob and not moving then BAM it lined up and was like a rubber band shooting down the strip, I got beat by 1/10 of a sec. So I just started tweaking after that.

LiveaxleLS1
03-26-2007, 01:56 AM
I'm a big fan of launching off of redline and slicks :)

sirhatch1030
04-14-2007, 09:15 PM
this is gey. u need to let some one else drive ,if u dont know what to leave at.

AnclyT
04-17-2007, 05:31 PM
silly road runner..
the higher the better..

street tires - launch at 12000rpms
drag radials - launch at 15000 rpms
slicks - i'd say about 35000 rpms

you should be able to cut a 1.0 60'... otherwise you SUCK


=x

KevinT707
04-17-2007, 09:40 PM
this is gey. u need to let some one else drive ,if u dont know what to leave at.
You're gay.

It must be just my setup then or something because I never feel the "sweet spot" where it just hooks right out the hole. This is on street tires and BFG DRs, they always seem to spin no matter what RPM .. then I have to feather it till it catches, just the DRs catch sooner

So what now? Perhaps its my stock soft struts or what .. :tongue1: