What RPM to launch?
11-08-2007, 02:35 AM
#1
10 Second Club
Thread Starter
iTrader: (38)
Join Date: Oct 2006
Location: Phoenix, Az
Posts: 1,259
Likes: 0
Received 0 Likes
on
0 Posts
What RPM to launch? Where are you H/C M6 guys launching at? I've got a Spec 3+ that grabs like a **** and want to know what RPM I should launch at. I've got a 10 bolt with Moser axles, TrueTrac and 3.73's. I would like to keep it at 3,000 or lower, would that be enough? Please post at what RPM you launch at and your clutch setup. Would be great to hear from 3+ people.
11-08-2007, 04:54 AM
#2
11 Second Club
iTrader: (10)
Join Date: Feb 2006
Location: Sterling Heights, MI
Posts: 2,215
Likes: 0
Received 2 Likes
on
2 Posts
i odubt 3 grand is enough
i on stock motor with 3.73s and bfg KDW and i bog from 3500 so i doubt youll be looking at under 4K
o im on a clutchmasters FX300 which is supposed to be comperable to the spec 3...
i on stock motor with 3.73s and bfg KDW and i bog from 3500 so i doubt youll be looking at under 4K
o im on a clutchmasters FX300 which is supposed to be comperable to the spec 3...
11-08-2007, 08:44 AM
#4
Yup, Save your pennies for a lil more axle because with a sticky track and even a hard Nitto drag radial, your 10 bolt wont live long. I leave off the two step at 5800-6200 depending on track conditions. Run a hard street tire and leave at a lower RPM to help your 10 bolt live, put a good M/T ET Street on there if you want to kill the 10 bolt post haste.
Good luck, Tom
Good luck, Tom
11-08-2007, 09:36 AM
#6
CARTEK Racing
iTrader: (13)
Join Date: Nov 2001
Location: East Brunswick, NJ
Posts: 2,182
Likes: 0
Received 0 Likes
on
0 Posts
I launch as high as the track/tire will hold. There have been times where I have come up on the clutch at 7200rpm [rev-limiter] I have a 12-bolt, and even that guys brakes every year with that kind of a launch.
Some years back with H/C and 396hp I was able to launch at 4700 on a BFG DR with 3.73 gears. The 10-bolt lasted about 20 passes doing that until it committed suicide.
Some years back with H/C and 396hp I was able to launch at 4700 on a BFG DR with 3.73 gears. The 10-bolt lasted about 20 passes doing that until it committed suicide.
11-08-2007, 12:27 PM
#7
My best 60' was launching at about 4500. Any less would bog, any more would blow the tires off because I have Nittos and wasn't doing decent burnouts. I got a 1.78 60' by slipping the clutch a little bit, but not much. That was with a Spec 3 and when I was making like 386/344, I believe. I also had a 12-bolt w/ 4.10s.
You'll definitely need higher than 3000 to get any sort of respectable time. But it's also going to kill your 10-bolt. Start saving and if you're close to the track, race it until it goes! Might as well make the most of it!
You'll definitely need higher than 3000 to get any sort of respectable time. But it's also going to kill your 10-bolt. Start saving and if you're close to the track, race it until it goes! Might as well make the most of it!
Trending Topics
11-08-2007, 12:37 PM
#8
TECH Addict
iTrader: (19)
Join Date: Mar 2006
Location: Owings, Md
Posts: 2,157
Likes: 0
Received 0 Likes
on
0 Posts
Practice launching on the street assuming youre using street tires and not dr's. just find out at what rpm your tires start to spin at when you launch, and launch from there at the track
using dr's you'll probably want to leave at around 3500ish. but thats just a base point to start from. and if you are using dr's, save for a rear end cause you'll need one soon. some rear ends dont even last one launch on drag radials
using dr's you'll probably want to leave at around 3500ish. but thats just a base point to start from. and if you are using dr's, save for a rear end cause you'll need one soon. some rear ends dont even last one launch on drag radials
11-10-2007, 11:06 AM
#9
10 Second Club
Thread Starter
iTrader: (38)
Join Date: Oct 2006
Location: Phoenix, Az
Posts: 1,259
Likes: 0
Received 0 Likes
on
0 Posts
Practice launching on the street assuming youre using street tires and not dr's. just find out at what rpm your tires start to spin at when you launch, and launch from there at the track
using dr's you'll probably want to leave at around 3500ish. but thats just a base point to start from. and if you are using dr's, save for a rear end cause you'll need one soon. some rear ends dont even last one launch on drag radials
using dr's you'll probably want to leave at around 3500ish. but thats just a base point to start from. and if you are using dr's, save for a rear end cause you'll need one soon. some rear ends dont even last one launch on drag radials
11-10-2007, 11:17 AM
#10
TECH Fanatic
iTrader: (21)
Join Date: Feb 2006
Location: Allen Park, MI
Posts: 1,370
Likes: 0
Received 0 Likes
on
0 Posts
im rolling on stock 10 bolt right now, stock gear and everything, and i just slip the clutch out on my nittos, with the new motor that makes 505whp, i have probably a good 30-40 passes on it and shes still kicking, i think the key to not breaking it is slipping the hell out of the clutch so you dont shock the rear end.
so, to answer your question of launching at 3k, i think its good if you do the right gas/clutch combo to launch it as hard as you can without bogging it
so, to answer your question of launching at 3k, i think its good if you do the right gas/clutch combo to launch it as hard as you can without bogging it
11-10-2007, 11:27 AM
#11
clutch dumps are only good if you've got the tires and rear end to hold (not to mention the driveshaft.
Some of the best 60 ft times I've seen off manual cars without slicks have done some wicked combination of clutch slip and wheel spin. Can't do hot laps on that, but if your clutch can take it, I'd do it like that. It'll be the difference between break or not with the 10 bolt.
Some of the best 60 ft times I've seen off manual cars without slicks have done some wicked combination of clutch slip and wheel spin. Can't do hot laps on that, but if your clutch can take it, I'd do it like that. It'll be the difference between break or not with the 10 bolt.
11-10-2007, 01:44 PM
#12
12 Second Club
Join Date: Nov 2006
Posts: 120
Likes: 0
Received 0 Likes
on
0 Posts
Leave at redline with deep gears and slicks. Don't slip the clutch unless you like replacing them. I leave at 7400 rpm with my 283. I have a 9 inch with moser axles and True Track. 1rst gear X rear gear ratio of 13.5 should be about right. I haven't broken a rear in years. You need to shock the tires hard to get the car out and the gears need to be deep enough so that once your out there, the motor will not be pulled down below 500 rpm from peak torque. If you bog the car, parts will break.
11-11-2007, 04:39 AM
#13
Teching In
Join Date: Nov 2007
Posts: 14
Likes: 0
Received 0 Likes
on
0 Posts
Are you guys launching at those RPMs with M/T ETs and a stock T-56 output shaft. D&D told me I would need the Viper output shaft to run 28" M/T ETs and use a MSD 2 step setup for 3.5 to 4 grand launches. I have a built LT1 383 with 480 HP at the flywheel, McLeod ST, built D&D Borg Warner T-56 (minus the viper output shaft) and a custom 9 with 4:11s. I want to add 28” MT ETs and a two step MSD ignition to lower my 60s below 2.0s. I am also going to 28" rear to eliminate shifting into 5th 500 ft feet before the traps.
Appreciate the information
Eric
Appreciate the information
Eric
11-11-2007, 12:27 PM
#14
Leave at redline with deep gears and slicks. Don't slip the clutch unless you like replacing them. I leave at 7400 rpm with my 283. I have a 9 inch with moser axles and True Track. 1rst gear X rear gear ratio of 13.5 should be about right. I haven't broken a rear in years. You need to shock the tires hard to get the car out and the gears need to be deep enough so that once your out there, the motor will not be pulled down below 500 rpm from peak torque. If you bog the car, parts will break.
Slip the clutch a lil not to much and not alot
