BigSteele

iTrader: (17)

Ive seen most people say to shut off about 200 rpm before the limiter. I have a F14 cam with the limiter set at 6800. heres my dyno graph
http://darmer.com/dyno%20graph.htm
I have stock bottom end so I was thinking maybe when Im spraying shift a little sooner to be on the safe side.
When I shift at the track I release the gas pedal when I do the clutch and then hit the gas back down when I shift, so the WOT switch should cut off when I shift, but Im not sure if this affects any thing.

I was just wondering where I should try to cut the spray off at and where to shift. I wasnt sure how long after it cuts off the nitrous stays in the engine. Is the goal to time it so you shut it off, and just as the remaining nitrous goes in you should shift? and for max performance this should be right before the rev limiter?

Nitro Dave's Nitrous Outlet

iTrader: (25)

According to your graph yuor HP starts falling off at 6400-6500. So that is where you need to shift at. Set your window switch at 6500 This will put it 300 RPMs before revlimiter and keep you shifting where you should.
Dave

WickEdSix98

iTrader: (4)

To run his quickest ET's, he needs to shift 200-500RPM past his peak HP numbers that way it falls back into the power band when it shifts. I'd set the window switch at 6600 and shift at 6600-6700. You could probably benefit from a higher rev limiter and higher shift points but if you're on a stock bottom end thats probably enough.

BigSteele

iTrader: (17)

thanks for the info!
so should I try to shift right when the spray is set to cut off? (according to window switch)

I would assume its slow if it runs though the engine and the engine looses power before you shift, but I was thinking its also bad to get off WOT when I shift if its still putting nitrous in the engine (cause it takes a small amount of time for the remaining in the intake to travel though right?). So I was thinking there is some small interval of time you should maybe wait after it cuts off to release WOT when shifting
Or is this not really an issue and dont worry about it?

Im sure I wont be able to actually do this perfectly anyway, it would depend on my reaction time consisancy when i see the shift light, and that changes for every gear, but I was just wondering about the theory behind it

Thanks again Dave for my nitrous stuff

XTrooper

Actually, you should shutoff the spray 200 rpm before your shift point (not your rev limiter setting) so you don't spray through your shifts (unless you want to or have a tranny built to take it).

BigSteele

iTrader: (17)

I know its best to shift like that but since Im getting all this extra power with the nitrous I was thinking I dont really mind loosing a couple 100 rpms to be a little bit safer on the engine. Im not really sure what kind of danger it is to rev up to almost 6800 every time but Id rather keep it just a little lower when Im spraying to be on the safe side

BigSteele

iTrader: (17)

so maybe
set shift light to come on at 6000??
set window switch off at 6400
try to react consistantly and shift at 6600

I forgot how many rpms it takes me time-wise to react (usual reaction is .5 sec right?)

XTrooper

Sounds like a plan to me.

Robert56

iTrader: (2)

I have my ws set to turn off at 6400rpm, shift at 6500rpm and moved limiter to 6800rpm. I also am trying to minimize the torque hit on tranny for longevity sake. Seems to work fine for me. I also shift pretty hard and fast, with a chirp into 4th often.
Robert

BigSteele

iTrader: (17)

cool, I was thinking if its hitting real hard after I shift and spinning I could not press the gas all the was until after the clutch has engaged and then get on it all the way. This way the WOT switch would make the system wait until the shock of shifting is done, then hit the extra power.

I guess Im going to just have to experiement at the track to see what works with me. Man I cant wait to feel my car pull with it!!

Turo

iTrader: (23)

Go out and test your reaction time with the light. Mine comes on at 6400 and I shift at 6600. Window switch shuts off at 6400 also.

BigSteele

iTrader: (17)

yeah I guess I will just have to do that. Its hard because first gear goes so fast if I dont want to hit the limiter I need to set it farther down, but then I actually have to pause an instant when shifting for later gears. So its hard to do it consistantly. I could just shift early in 1st but please, thats where the acceleration is at!

Turo

iTrader: (23)

Yea you're right, first gear on the spray does go by REALLY fast . In my case, I spray from 2nd gear and on so I never really considered that (don't want to spray 1st gear until I upgrade to a 9").