What is the best way to launch an automatic off the line? Also, would you suggest manual shifting on the automatic through the first 3 gears?

 

Two schools of thought on this:

1) Flash your TC and floor it
2) Brake torque to 1500-2000rpms

Personally, I'll be going with the first method as I don't think it's as hard on the car.

~THT

 

TC? Brake-torque?

 

TC - Torque converter. You flash it by holding the brake with just enough force to keep the car from moving forward.

Brake torque - Give the car gas until you reach desired RPMs while standing on the brake pedal.

~THT

 

Yeah, I already do that. What would be the best rpm's?

 

Depends on your mods as well as the condition of your tires. Try a variety of RPMs and find what results in the best 60 ft.

~THT

 

Would it be better to manually shift the gears?

 

Personally, I won't because I have a GXE that naturally redlines every gear. If yours is the same way, no sense in interfering with it. Again, try it both ways and find out what's best; that's what tracks are for.

~THT

 

Did I miss something here, since when did GXE's shift at redline?


Epcay Shift at redline otherwise and don't bounce off the limiter, it's hard not to do in 1st. What mods do you have? When are you going to run? What's the elev. of the track? Post results ..

 

Few do, most don't. SE models are the opposite; most do, few don't.

~THT

 

You can see the mods in my sig. Intake, Catback are the main performance ones. I have run a few times. Best I have done so far is 15.09. I keep dropping at least a tenth every time I run so it is just a matter of driving it right. I do have 18's on though. Thinking about putting my stock 17's up front and seeing how it runs.
I don't know the exact elevation but the surrounding area is about 450ft above sea level.

 

Niether of my SE's do.

 

Any more help?

 

When I was A/T I simply stood on the brake and dumped the accelerator. The TC only let me up to about 1800. I did notice there was a way (at times) to feather the accel. up instead of dumping it and getting better 60' but I never had enough time to experiment before I converted to 5spd.

 

Now with my VB mod it shifts closer tor edline, but since the shifts are so crisp, I need to hold the gear longer because being that is shifts quicker the recover rpm in 2nd gear is much lower tnan with the stock unit. So now I have to do it at redline, and a little after (darn Max tachs being odd so much) so that I will be at about 4.1-4.2k. Also, I wanted to ask opnions of what people think about ... ok Do you finish 3 gears in the 1/4, or finish while still in 3rd? Just a though from driving maximas for a while ... basically the lockup tq convertor will rob about 300 rpms if left in 3rd, and if not you gain it if you leave it in 4th/OD, but by leaving it you can't shift past 6k ... but would this be worhtwhile rather than going from 2-3 and leaving it in 3rd, but instead going from 2-4 (the auto will stay in 3rd while WOT if any one doesn;t know) so you will have the extra 300 rpms ... just a thought ...

 

Yeah i just Break-Torque at about 1500 rpms

 

i have to manually shift myn so i can get her to shift at 6600. and yes i brake tq. simply becuase engine is starting at a higher RPM so it has less distance to climb and you have much more power at 1500 RPM than 700 rpm

 

i hate manually shifting. feels so bad for the car, and yea it's hard to time it right in 1st so youre not workin the limiter, happened to me once and oh did i feel the pain, and the smell afterward....

 

how much for the tranny swap thinking about doing that or full tranny rebuild

 

adollartw0ninetyeight.

 

In order to really reach the stock redline, your tachs needs to go to 6700-6800 (depends on the car).

 

Dude, the former member that started this thread is ... Let it die But you make a valid point, just that it's been beat to death..

My A33B tach is compared to my A32... I've said this before though.

E55AMG2 said it best ... Depends if your car was class clown or valedictorian

 

I hadn't noticed he was banned.

 

if you dont want to bounce the limiter you have to shift a while before it. I just went on sunday and i bounced it once when i shifted at 6300. as for the time, with your mods you should be able to pick up about .3 from what you have done. just dont stomp the pedal at start, go slowly into it so the engine doesnt bog...trust me it works. i ran 15.08 with the own the pedal method and 14.7 with the slow pedal method (with 18's). also, youve got to manual shift otherwise you wont get everything that your car has. so back to the question. when i launch i brake torque it to between 1200 and 1500, it actually seems to give me better times when im at the lower rpms, dont know why. i think that revving to 2000 before you launch confuses the computer, just a guess. give a couple methods a try and just remember what you did for each run so you know whats fastest.

 

bah, banned, i didnt notice either.

 

Damian87 brought it back from the dead

 

I hadn't noticed his post.

ARRRRRRRRGGGGGGGGGGHHHHHHHHHH!

 

Epacy - if you're pretty close to stock don't power launch (brake down with 2,000rpm) - you will not go as fast as what THT calls a 'TC' launch.

Try 1,000 with just enough brake pressure to keep still then push the gas down hard when it goes green.

I've only had two 1/4 mile runs but even I can see that there are too many variables involved to be accurate here mate: tyres / pressure (25PSI fronts and 40PSI rear) / mods / ride height - have you lowered your SE?

Best advice is to launch @ 1,000rpm (just above idle) and work from there. That's what I'm doing bro.

 

He's BANNED.

The originator if this thread is BANNED...Stop giving him advice...
or not...

 

Ok, since we had 800 responses on auto launches, how about 5sp? With mine I take it to about 3000 and ride the clutch out, but my 60' stays in the 2.2~3 range. Now this is of course on street tires, but they have almost 100% tread and hook quite well. Any suggestions here?

 

Wrong thread ..... There are threads to be found in this topic.. A page or 2 back ... Many methods...

Look at the best timeslips, and they may have their technique.

 

How bad is it for the tranny if u shift manually on a AUTO 97 maxima? i rather get a tenth of a sec more and leave it in drive than kill the transmision.

 

Don't bother with manual shifting - otherwise buy a manual mate. Autos respond best being launched and driven the way they were intended - automatically self-shifting.

Unless you install a high-stall TC and modify your TB.

Waiting for the hammer from New Mexico to drop......LOL...

 

I meant your 'VB' not your 'TB'...

 

http://forums.maxima.org/showthread.php?t=454539
post no. 10 has your answer

 

thats not even true. most auto will get better times if shifted manualy. unless your auto is going all the way to the fuel shutoff, you can probly manualy shift it to a better time. it doesnt matter, its not like its really any different for the trans to shift it manualy, just holds the shift off longer.

 

The reason I shift manually is because I have a MEVI and 7200 rev limit..