Launnching with a boosted car. Techniques?
02-16-2006, 07:52 AM
#1
Launnching with a boosted car. Techniques?
Hey you guys that are boosted and that have been to the track and pulled good 60' times how do you launch your car? Need some help to improve my horrid 60' (changed motor mounts that was one big problem) but ill take any advice on how to launch a boosted max turbo specific because i would think launching a supercharged one is a bit different.
02-16-2006, 09:22 AM
#2
You have to be on slicks or at least DRs, there is no other option. 60' doesn't tell the whole story with this much power. I can pull a 2.2 (average) 60' time and then floor it when I hit second gear and spin past half track.
02-16-2006, 09:56 AM
#4
Originally Posted by I30tMikeD
It only took a few times at the track to realize there is absolutely no point in running street tires
02-16-2006, 10:19 AM
#5
but see your supercharged i think tis a little diff to launch turboed ones, and i need to get some dr or slicks, from what i remember when mardi got his 11.5 he lauched at 7k rpm i believe.
02-16-2006, 10:48 AM
#7
Originally Posted by MaxInProgress
Hey you guys that are boosted and that have been to the track and pulled good 60' times how do you launch your car? Need some help to improve my horrid 60' (changed motor mounts that was one big problem) but ill take any advice on how to launch a boosted max turbo specific because i would think launching a supercharged one is a bit different.
02-16-2006, 10:49 AM
#8
Originally Posted by MaxInProgress
but see your supercharged i think tis a little diff to launch turboed ones, and i need to get some dr or slicks, from what i remember when mardi got his 11.5 he lauched at 7k rpm i believe.
02-16-2006, 11:02 AM
#10
Here is the part of the article.
In the Spring of 2004 Mardigras felt that he had exhausted the potential of the Supercharger and wanted more power, a faster car and better quarter mile times. At the time, turbo-charging the Maxima showed the potential of doing just what he had in mind. Over the summer and winter months the Supercharger install was dismantled and the car was retrofitted with a T4, 61-trim Turbo. On March 6th Mardisgras was able to put the new install to the test and try to break his previous record. He threw the M&H slicks on the car, turned the boost up to 16.5lbs, armed his 35 shot of nitrous, revved the car close to 7000 rpm and when the light turned green he let-er rip!! Not only did he beat his previous record, he shattered it! He crossed the finish line in 11.5 seconds at 121mph!!! What makes this even more special is that all of this is done with a bone stock Nissan VQ30 engine!!!.
02-16-2006, 11:09 AM
#11
If you can get traction and if your drivetrain can handle it wouldn't you want to lauch higher so you're in the best part of your power band (ie -already into full boost)?
That's the nice thing about a 2-step limiter, you can sit there at the line and build boost before you launch (well that and being more consistent, less pedal finesse required).
That's the nice thing about a 2-step limiter, you can sit there at the line and build boost before you launch (well that and being more consistent, less pedal finesse required).
02-16-2006, 12:01 PM
#12
Originally Posted by MaxInProgress
i dont know but he had slick so im assuming he could grip, but in the article it said he launched at 7k
02-16-2006, 09:57 PM
#13
Ideally I want it right at the border of traction. For me, this meant launching (doesn't mean dumping the clutch!) around 5000-6500rpm. A quick feather holding power@wheels vs traction balanced, ending with full engagement around 5000rpm. *Remember turbos spool accordingly to load -- simply being at 6000rpm does not mean you are making any boost or significant power
If I had to choose - I would always rather spin more than launching at 2000rpm and bogging. Spinning is controllable, but once you are bogged/lagged you can't help that (other than clutching again etc, which turns into a mess)
I'm sure you get the idea now about tires, you need slicks if you are trying to plant serious power.
If I had to choose - I would always rather spin more than launching at 2000rpm and bogging. Spinning is controllable, but once you are bogged/lagged you can't help that (other than clutching again etc, which turns into a mess)
I'm sure you get the idea now about tires, you need slicks if you are trying to plant serious power.
02-16-2006, 10:03 PM
#14
One other thing to consider when launching a manual... drivetrain shock.
If you have lined out traction to the point that you can come off the line hard, you may want to start slipping the clutch a little at the tree while on the brake to load the drivetrain. This way when you launch you are just finishing the motion, rather than delivering a shock/blow to the transmission+axles
If you have lined out traction to the point that you can come off the line hard, you may want to start slipping the clutch a little at the tree while on the brake to load the drivetrain. This way when you launch you are just finishing the motion, rather than delivering a shock/blow to the transmission+axles
02-17-2006, 02:21 AM
#15
This may sound like a noobish question but I have no experience with slicks or DR's. I know with slicks you would do a burn out in the burn out box to heat them up but does that need to be done also with DR's?
02-17-2006, 04:46 AM
#16
Originally Posted by jcy98maxse
This may sound like a noobish question but I have no experience with slicks or DR's. I know with slicks you would do a burn out in the burn out box to heat them up but does that need to be done also with DR's?
02-20-2006, 07:03 AM
#18
I actually do a burn out with my street tires. I've only recently started doing that, and have been able to get better traction after heating them. I have Kumho MX's by the way.
02-20-2006, 07:57 AM
#19
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Doing a burnout on street tires goes against common sense because it makes them slicker and actually should make them more prone to spinning, but I have to admit that I am at a loss on how to explain that my best 60' on street tires with no burnout is 2.12, and the best 60' on the same tires with a burnout is 2.02.
02-22-2006, 09:56 AM
#22
Slicks at ~12.5psi. Pull into the water box lock the e-brake and spin for just a second to get the slicks clean and wet. Pull forward a foot, lock the e-brake and spin up first, shift into second and hold at revlimit until I see smoke start comming up for a few seconds. Release the e-brake and shoot forward as im letting off the gas perhaps 10 feet or so to see how they feel and grip. Begin to pull up to the line. Talk to myself telling myself to calm down and drive my race! Stage first light. Purge the juice, arm the system. Stage the second light. Press my helmet back against the headrest. Rev to 7k and hold. Wait for the last yellow or the three yellow on a pro tree and quicky pull my foot up off the clutch and I floor the gas. Normal fast shift into second at 7k...
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