I'm basically just wondering what pill to use for the shut off? I'm going to set the activation at 3000. Just wondering what pill everyone else uses/recommends for the shut off on an LT1 with an A4 and stock shift points? Would a 5,500 pill be cutting it too close? Thanks in advance

 

Any help is appreciated. Thanks.

 

the computer shifts at about 5700 rpm. i would set it for 6k. i never used one on my 94 z28 though. just let it do it's job. went 12.24 @ 113.90 on a dry 125 from NOS. NA was 13.60

 

I think I'll set it at 5500-5600 RPM. Definately don't want to set it at 6000. That would defeat the purpose of having a window switch. I think you might be talking about a Rev limiter setting???

 

nope. i know exactly what a window switch does. you have an on setting and an off setting. my point was don't need one. the tranny is computer shifted. you have all this power going up to the point of just before shifting. then you take it away. so now, the computer gets a little confused about what just happened. then it wants to shift from 1st to 3rd because of it. then when it does, the n2o comes back on. now you go from 3rd to 2nd.

think about it like this. take your car and floor it in first. then just before it shifts, let off the pedal. what does the tranny do? goes to 3rd or even 4th. now punch it again. there's a downshift. or maybe even a time of confusion where you let off then immediately punch it. the tranny now is trying to figure out go to 3rd or 2nd. then it finally decides.

window switches are great for manual guys. they want to shut off about 50-100 rpm before shifting. that way the revs don't shoot up when they press the clutch in to shift.

 

The auto guys want them to relieve the stress on their drivetrain.

 

mrr23 has lost his mind dont listen to him Who would let off and punch it again while using nitrous

Anyways, if you dont want it to spray during the shifts (and u shouldnt) Id set it no more than 5600 on stock shift points.. Anything lower and you should be just fine.

 

and you're a moron . i'll clarify, do that without the n2o and watch what happens during shifts. it's illiustrate what the ECM is going to do. and why shouldn't you spray through the shifts? i have never used a window switch. and never will. i've been using n2o for almost 10 years now. tell you what. go to the track. ask real racers (10 sec and under guys) that use n2o and see if they turn it off before each shift on an auto. there's your answer. again not needed with an auto.

here's my list of cars that i have used it on

79 z28 150 wet 12.58
86 TA 150 wet 12.13 @ 116 www.fl-thirdgen.org/mrr23
94 z28 125 dry 12.24 @ 113.90
99 TA 150 wet 12.096 @ 115.23 www.stealthram.com/1999TransAm.html
00 formula 200 wet 11.976 @ 118.24 www.stealthram.com/2000pontiacformula.html

with my current formula just hitting 11.97 @ 118 with 200 n2o and SLP airlid only.

 

maybe. but i look at it like this. turning it off then back on puts more stress on it. again think like this. without the n2o floor the pedal, let off, hit it again, let off, hit it again. you are putting so much torsional stress on the drivetrain. granted you aren't using as much as i do. but you didn't say how much you are using.

end result of all this, do what makes you feel good. if you have more peace of mind turnin it off before shifts, then by all means do it.

oh and if you want to relieve more stress on initial hit of the n2o, get a progressive controller. that way you can set it for 50% initial when activated and say 1 second later add the other 50%. say you are using 100hp n2o. so you set the initial to 50% (50hp). then set it for 1 second later activate to full 100% (100 hp). i'll sell you mine. it's in my tool box doing nothing. used it for a month.

http://www.fl-thirdgen.org/mrr23/ima...controller.jpg

 

Listen, the PCM is not going to get "confussed" because of sudden power loss, then put back again after shifting. The car doesnt shift based on horespower.

The PCM has a strict WOT table, and while under WOT the car will only shift at what the computer tells it to.. Regardless of how much power is being put to the ground at that time.

Sure I can go out in my car and "illustrate" what you said, by mashin the gas, letting off and mashing it again. But that affects the PCM itself by changing the TPS variables in the WOT tables, causing the computer to what it is programmed to do.

Just listen to what I said. People have been using window switches for years to help save the life of their automatic transmission, use it. As far as torsonial stress, I couldnt really tell yeah, but I'd say alot of torsonial stress would come from spraying on launch not so much spraying at a higher RPM.

Just my 2cents

 

you are most likely right. about the throttle cable changing the line pressure. and the TPS sending info. didn't think on that part of it. but, still can't see how it will save the life of the tranny just because of it turning off during shifts. because the power is there. that's like saying a NA motor would need to find a way to cut some power before shifting. just to save the tranny. as with any way you make power ( NA, n2o, turbo, SC), the stress comes on as you apply it. with n2o usually being the hardest on a converter. becaused of the sudden increase in torque. all the others build up waiting for rpms to spool the turbo and SC. and NA just waiting on rpms to climb.

but i'll quote myself: