Okay, here is a question for any engineering types out there. Kind of like the chicken and the egg thing. On camaroz28.com I have seen several posts regarding using a window switch on an automatic to turn off the nitrous right before the shift point to help save the tranny. Now using it to shut off the N20 so you don't hit the rev limiter is great and I see it's benefit there 100%, but the tranny thing I just don't see it. Maybe I am analyzing it too much. As we are accelerating let's say in 2nd gear and we are coming up on 5800rpm's and we have the switch set for 5600. The nitrous turns off at 5600 we go the next 200rpm's naturally aspirated then the car shifts at 5800. As soon as the car shifts the rpm's are going to start their swing downwards. By my thinking, in the very short time that it takes the rpm's to drop down to the bottom of the curve where the tranny has fully engaged itself into the next gear and begins it's swing upwards again is where the slippage occurs. With the window switch as soon as the rpm's drop to 5600 or below, the nitrous is going to engage again and put the additional torque strain against the tranny as it is in the process of shifting during this transition or slippage window.

So my question is are the Z28 drivers right about this concept of using a window switch to save the tranny or does it not make a difference :confused:

 

Well...Hmmm... I run a window switch on every N2O application I install, whether it's a stick or an auto. I like the extra margin of safety as well as being able to tailor where the N2O comes in. I kind of see the relevance of the tranny feature, but N2O is a huge torque boost either way and if your tranny isn't prepared for it a window switch isn't going to save it! I can certainly see turning it off at a slightly lower rpm than the shift point (I do this on my stick car), but as soon as the shift occurs you are correct in the statement that as soon as the rpm drops back below the cutoff point it will come back on and hit the tranny just as hard. As a tranny saving feature I just don't see the reasoning because it's going to hit as soon as it shifts and drops down anyway and in reality as you've stated; it's going to hit damn hard at drop and probably slip even more!!
-Jeb Burnett

 

Well right now I am only using the bottle on the street, so I just manually turn off the switch right before I shift then turn it back on again after I start pulling in the next gear. I really can't see that I am losing much more than a tenth or two doing it this way and I KNOW this will help with the tranny and torque converter life.

 

I spray 125HP on a 95 auto. Ask a good trans man if you are gonna hurt it. I doubt it. I used to spray 200hp on a little C4 trans in an EFI mustang that would go 10's. You never see window switches on a mustang. I could see it on a stick car incase you miss a shift, but your auto will never miss a shift.

 

I do not have a window at this time just a WOT set at 90 percent.
Automatic trans - do I need a window switch? :confused:

 

It's a good idea but you can get away without one as long as you only juice when you are in D and over 2500rpm. I would go ahead and install one when you get a chance though.

 

Thanks - Will do, I don't want to blow up my baby.. :eek: