Tuning a 4L60E for nitrous
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Tuning a 4L60E for nitrous I have a 98 Camaro, 3600 stall, 75 shot of juice. At the track with the nitrous spraying from 3000-6400 controlled by a window switch it is touching the limiter. Not very noticeable on the 1-2 shift, but on the 2-3 shift it hit for a significant amount. The software I will be using to tune the car is LS1Edit. What would be a recommended way of fixing this problem? The options I'm aware of are lowering the shift point, increasing shift pressure, lowering the window so that it's not spraying into the shift, and raising the rev limiter. The motor is stock from intake to oilpan, though it has a cold air intake and full exhaust with a cutout for the track. I was thinking that I could just lower the nitrous window to 6000 so that it is not spraying through the shift, but then in 3rd gear near the top of the track I think I'll be revving at or above 6000, and I would want it spraying and it wouldn't be. So maybe either increasing the shift pressure or lowering the shift point? Obviously lowering the shift point probably wouldn't be ideal, so I guess raising the shift pressure is best, unless it's already maxed out? Maybe a B&M shift kit to increase pressure? Any suggestions on what would be the best way to resolve this problem? Thanks
I would say lower the shift point, You have to remember the trans is doing the same thing with or without the NOS. The difference is the engine RPM are rising faster, So while it takes the same amount of time for the trans to complete the shift in either case more rpm will pass in that same time taking you to the rev limiter.
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ya that's kinda what i figured. i'd rather make sure that the window switch isn't shutting off the nitrous at the end of the track. originally i had it shutting off the bottle at 6200 and i heard it tap the rev limiter once, then i raised it to 6400 using some reverse logic thinking that might help. it ended up hitting the rev limiter 4 or 5 times. i could lower it to 6000 and see what happens, but then I believe I might be losing some power. I guess i'll have to take a look at it. i don't know what the shift points are set at right now, but if i set the shift point at 5800, is there any need to have the bottle on above 5800?
without converter slippage, based on the trans ratios and the 342 gears i have it should be turning around 5400rpms through the traps at 113. it's the converter slippage that I think might be putting me up around 6000, I'll have to see
without converter slippage, based on the trans ratios and the 342 gears i have it should be turning around 5400rpms through the traps at 113. it's the converter slippage that I think might be putting me up around 6000, I'll have to see
A good built 4L60E is a good option. Mine shifts at 6300 on motor and 6400 on the bottle. I spray through the shifts and go through the lights at 5700 rpm with 3.23 gears in 3rd gear.
Thread Starter
11 Second Club
Joined: Mar 2008
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Thread Starter
11 Second Club
Joined: Mar 2008
Posts: 185
Likes: 0
hey what are you running for times/mph? what rpm are you trapping at? i'm thinking of switching from 342s to 373s, just curious to what I could expect. i figure maybe a tenth or two
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Thread Starter
11 Second Club
Joined: Mar 2008
Posts: 185
Likes: 0
I would say lower the shift point, You have to remember the trans is doing the same thing with or without the NOS. The difference is the engine RPM are rising faster, So while it takes the same amount of time for the trans to complete the shift in either case more rpm will pass in that same time taking you to the rev limiter.
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