Launch RPM?

by **Malakai** » October 17th, 2008, 10:49 am

What RPM do you find is the best to launch at and why?

I generally aim for around 2300 to 2500, that's around about the RPM which I get full boost at full throttle. So once I let the clutch out and it loads up boost is there pretty much straight away. I'm looking to refine my technique though.

Obviously you need to adjust for surface conditions to minimise wheel spin.

But otherwise what have you found works best?

by **BROCKYB8** » October 17th, 2008, 11:53 am

5000 for me
well me being na 6

by **AaronEF8** » October 17th, 2008, 12:14 pm

5000 GRAND for me

You launch at 5 million rpm?

In my EF I would stall it to about 2700 on the brakes and get minimal wheelspin off the line, just enough to keep the engine in it's powerband for that first second.
All the turbo manual BA-BF's I've driven I found 2500-ish to be an ideal take-off rpm with a bit of clutch slip, then flooring it by the time the clutch is all the way out. Any more and it becomes more of a burnout than a launch, and any less it bogs down, although nothing compared to an R32 Skyline.

by **LTDHO** » October 17th, 2008, 12:23 pm

Depends on cam, stall speed and gears.

If your cam and stall start around 3000 for example.
I would hold at 2500 and flash it.
I am a big fan of flashing the convertor (unless you make monster power)
This way torque gets you out of the hole for a best 60ft.

by **BROCKYB8** » October 17th, 2008, 1:01 pm

I suppose most of you are turbos. My na need more revs and doesnt have o worry about the boost .

by **big-fella** » October 17th, 2008, 1:06 pm

I only have a Gtech to go buy, but the best 60ft i get from a near stock AU is from around 2000rpm stall. Anything more is a little wheel spin or bog down. Anything less it slugs off the mark.

by **Bipolar** » October 17th, 2008, 2:23 pm

I found with an auto and average tyres, 2200 was perfect.

by **krisisdog** » October 17th, 2008, 4:00 pm

In my NA 6 in first it'll wheelspin its tits off if your try to launch it above 3 grand, thats just slippin the clutch.
I can dump it at 2-2.5k rpm, and then slowly floor it, or slip it between 2.5-3k. Either way full throttle in first normally equals mass wheelspin lol.

by **67rce** » October 17th, 2008, 9:22 pm

Slo_sprint and I found around 4000-4500rpm for the Wheezer, and i found in my old XR6 slip clutch at 4500rpm

http://video.google.com.au/videoplay?do ... +XR6&hl=en

by **Hybrid34** » October 18th, 2008, 5:49 am

BROCKYB8 wrote:5000 for me
well me being na 6

5grand!! thats huge, Dont' you find you get massive wheel spin before you get traction?

- Ash

by **FairmontXR6** » October 18th, 2008, 6:18 am

With my current set up, 1200rpm seems to work well for me.
Anything higher than 1600-1800rpm and the tyres just bake.

by **OED666** » October 18th, 2008, 8:48 am

depending on how sticky the track is, but anything from 4000-5000rpm. the only thing i could get to complain with those launches was the diff.

krisisdog, you have to lower your tyre pressures, and also do a nice skid to get the tyres sticky.

the track is completely different to the street. for me, 1500rpm soon turn's into 6000rpm and going no where on the street.

by **krisisdog** » October 18th, 2008, 11:33 pm

Yeh, my launches arent at the strip, and im running 35ish psi in 205s 15"s, so I'm sure I could launch at at 4k with decent tread.

by **EL XR8** » October 19th, 2008, 7:50 am

You do realise street tyres, don't exactly 'heat up' very well. Unless you plan on doing some monster burnout, which most places wont let you do. It's really only good to do it, to clean the crap off your tyres.
Slicks on the other hand...

Around 8,000rpm is a good rpm to launch at. Slip the clutch a little so the front doesn't come up, lol 8-)

For the EL, around 3 grand and slip the clutch to stop it bogging down.

by **Rollin** » October 19th, 2008, 3:14 pm

The best way to get the most traction at the drags is to start your skid *just* out of the water in the water trough, and get onto the actual track as soon as possible - creep down past all the water that people have dragged onto the track and really back the f*ck out of your tyres on the dry stuff.

The point is not to heat your tyres so much, but to coat them with all the rubber that is already stuck to the track, which gives the best friction co-efficient. OED and I have found that by doing the above, out rear tyres are still noticably sticky to touch, even after we've lined back up in the staging lanes.

by **oneredED** » October 19th, 2008, 4:39 pm

My car wasn't making much power N/A (98rwkw) but I still managed some 2.0XX sec 60' times out of it launching at 4000rpm at Heathcote on my way to a dismal 17.1 second quarter. :oops:

.
I found with stacks of heat in the tyres (235/17 @ 30psi), I could literally dump the clutch in a split second it would just launch like an animal, no slipping required. I ended up with my dash mat on my lap and the fuse cover sitting on the floor at one stage. At Calder Park however, I could only dial in 3000rpm, and I needed to ride the clutch to get it off the line with minimal wheelspin... and got 2.2-2.3 60' times and a 15.6 ET to show for it

by **NUT347** » October 19th, 2008, 8:42 pm

^^ 15.6 aint bad for 98kw!!!!

when mine was n/a auto, with 205s, without doing a skid i got better traction (usually street tires are shitty after they are skidded) i used to stall it up to around 2000, not sure of 60ft, but managed a 14.7 with stock gears and 205rwhp

by **oneredED** » October 19th, 2008, 9:02 pm

NUT347 wrote:^^ 15.6 aint bad for 98kw!!!!

The old T5 gearbox hates me I'll put it that way.

by **Rollin** » October 20th, 2008, 1:05 am

oneredED wrote:I ended up with my dash mat on my lap and the fuse cover sitting on the floor at one stage

Nice work

I've only managed the fuse cover trick once haha. Do you superglue your interior light cover on?

by **BROCKYB8** » October 20th, 2008, 8:43 am

Hybrid34 wrote:
BROCKYB8 wrote:5000 for me
well me being na 6

5grand!! thats huge, Dont' you find you get massive wheel spin before you get traction?

- Ash

Generally a little wheelspin but not to much. ITs howu come off the clutch. I tend not to fully dump the clutch like most people .

by **thebeast.** » October 20th, 2008, 10:08 am

how do you launch it with a auto?
foot on the brake n plant acc??? wouldnnt it just spin
or put it in N rev in out then slam it to first. which wouldnt to good for the gear box

by **BROCKYB8** » October 20th, 2008, 10:18 am

im A MANUAL as is oed and i also believe rollin maybe as well .

by **krisisdog** » October 20th, 2008, 10:35 am

Pretty much everyone one is in this thread is a manual driver BrockyB8.
So you're slipping the clutch at 5k rpm?? How many clutches you go through doing that??

by **Commando** » October 20th, 2008, 10:35 am

Also overdoing it on street rubber will make them slipperier if they've got silicon in the compound. The silicon will make its way to the surface if heated up (and the spinning tyre will assist this in a centrifugal manner), semi-coating the surface with slippery silicon instead of sticky rubber.

As for an auto, NEVER N-bomb it lol. Find how high you can stall it up in gear (with your foot hard on the brake, skid style) without wheelspin & that's where you should launch from (assuming you've got no high-stall and a stock-ish engine).

by **thebeast.** » October 20th, 2008, 10:38 am

yep, no high stall and stock as a rock. and id never "N bomb" it did it once, that was bad enough

by **misk** » October 20th, 2008, 11:35 am

lol
dumping from neutral to D = breaking things

by **thebeast.** » October 20th, 2008, 11:43 am

misk wrote:lol
dumping from neutral to D = breaking things

exactly, mates of mine do it, shifts cleanly, i did it once, biggest clunk even, thought im never doing this again

by **misk** » October 20th, 2008, 11:57 am

i did it in my VH (has a built powerglide and was running a turbo 202 at the time) because it wouldnt idle properly, so dropped it into 1st from neutral at around 2000rpm, broke the bolts on the tailshaft at the dif lol
my car had a sleep over at the local BP that night

by **BROCKYB8** » October 20th, 2008, 12:24 pm

krisisdog wrote:Pretty much everyone one is in this thread is a manual driver BrockyB8.
So you're slipping the clutch at 5k rpm?? How many clutches you go through doing that??

MAte im still on a standard clutch which ive had on the car since day one mate. And thats prob been down the trach atleast 100 odd time .
And I dont know all you guys so im sorry if i didnt know that u guys weremanual .

by **BROCKYB8** » October 20th, 2008, 12:27 pm

Krisdog i have been invovlved in circuit racing since i was 16 so i have had experience before getting a e series.

by **krisisdog** » October 20th, 2008, 1:52 pm

Its okay mate you dont need to prove yourself to me, I was just asking how you can slip a clutch from 5k rpm without frying the **** out of it. Not calling you a liar or anything, but I find it farken hard to believe a stock standard clutch could withstand 100+ runs down the strip, especially if any of them were 5k launches.

by **BROCKYB8** » October 20th, 2008, 2:27 pm

Well to be honest prop about 20 or 25 of them wouldnd be at 5 grand. but most of them are.
Paul from CVE on here would also prob done about 20 to 2 5 of them as well.

Im not trying to prove myself mate im just stating that this is what hi have done and been doing .
Well i prob thinking that i may need a new clutch soon but yeah thats after alot of years of driving .

To be honest i know nothing about drag racing and tend to go on what my mechanic tells me .
Now that we have gone to some mt radial s i think that a new clutch would be needed and most likely that will change my situation on revs.

by **FairmontXR6** » October 20th, 2008, 8:47 pm

thebeast. wrote:how do you launch it with a auto?
foot on the brake n plant acc??? wouldnnt it just spin
or put it in N rev in out then slam it to first. which wouldnt to good for the gear box

krisisdog wrote:Pretty much everyone one is in this thread is a manual driver BrockyB8.
So you're slipping the clutch at 5k rpm?? How many clutches you go through doing that??

FairmontXR6 wrote:With my current set up, 1200rpm seems to work well for me.
Anything higher than 1600-1800rpm and the tyres just bake.

My car is Automatic.

by **krisisdog** » October 20th, 2008, 8:54 pm

FairmontXR6 wrote:My car is Automatic.

Sooooooft.

by **FairmontXR6** » October 20th, 2008, 8:55 pm

krisisdog wrote:
FairmontXR6 wrote:My car is Automatic.

Sooooooft.

Yup, its also a Ghia

by **krisisdog** » October 20th, 2008, 9:02 pm

Softest of them all!!!!

Having said that...... I want a Ghia, but in 5spd. 8-)

by **FairmontXR6** » October 20th, 2008, 9:04 pm

krisisdog wrote:Softest of them all!!!!

Having said that...... I want a Ghia, but in 5spd.

Pfft manual.

4.11LSD and shift kit FTMFW

by **krisisdog** » October 20th, 2008, 9:10 pm

Manual > auto anyday.

With your 4.11s where does 1st n 2nd max out?

by **FairmontXR6** » October 20th, 2008, 9:18 pm

krisisdog wrote:Manual > auto anyday.

With your 4.11s where does 1st n 2nd max out?

60km/hr and 95km/hr

See video http://au.youtube.com/watch?v=QqJD-CrB1LA

by **krisisdog** » October 20th, 2008, 9:35 pm

Bah, I need something other than stock 3.08 gearing then lol. 2nd does just over a hundred atm, but it does get there pretty quick

.
Was thinking of 3.7s rather than 4.11s as I do a bit of hwy driving, and I dont have a 6spd

, otherwise I probably would get 4.11s, and also getting a locka rather than an LSD. $$$ either way.

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