Question for those who launch in 4-hi
04-16-2018, 05:12 PM
#11
Not all trucks have 4A...
Are you still using the stock converter? If so that is most likely the reason, mine only does around 2700 (in 4H though, mine doesn't have 4A)...
Interesting, (sorry to ask, but everyone forgets occasionally, I know I have) are you turning off traction control? I've definitely gotten my best 60's by brake torquing to ~2700. If you have any way of logging see what your torque source is doing when you get limited.
I've done 3500 launches in 4hi and she doesnt like them that much especially at the track computer cuts power, but from testing i've had my best 60' and times launching at 1k and just letting converter flash then actually loading her up. If there was anyway to remove watever is limiting or cutting power on hard launches it would be a big difference since it was a pretty violent launch i'm guessing thats why computer killed it.
04-16-2018, 07:02 PM
#15
I always turn it off completely, and I'm sure it reaching a tq limit somewhere due to it hooking at the track since the same launch in the street doesn't get shut down but then again in the street it does spin a little so i'm pretty sure its tuning related.
04-17-2018, 02:29 AM
#16
I wouldn't try 4A because the IWE aren't engaged and trying to get them to engage them under stress might not be a good idea.
I made a few runs a couple weeks ago and anything over 3500rpm and the truck would nosedive after about 10 feet. Not sure if it is traction control or what but my 60' times were 2.5X. Found the sweet spot on mine is 2500-2700 and that gets me 1.9 in the 60'.
I made a few runs a couple weeks ago and anything over 3500rpm and the truck would nosedive after about 10 feet. Not sure if it is traction control or what but my 60' times were 2.5X. Found the sweet spot on mine is 2500-2700 and that gets me 1.9 in the 60'.
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Scott91370 (04-17-2018)
04-17-2018, 09:30 AM
#18
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04-17-2018, 07:09 PM
#19
I wouldn't try 4A because the IWE aren't engaged and trying to get them to engage them under stress might not be a good idea.
I made a few runs a couple weeks ago and anything over 3500rpm and the truck would nosedive after about 10 feet. Not sure if it is traction control or what but my 60' times were 2.5X. Found the sweet spot on mine is 2500-2700 and that gets me 1.9 in the 60'.
I made a few runs a couple weeks ago and anything over 3500rpm and the truck would nosedive after about 10 feet. Not sure if it is traction control or what but my 60' times were 2.5X. Found the sweet spot on mine is 2500-2700 and that gets me 1.9 in the 60'.
I've done 3500 launches in 4hi and she doesnt like them that much especially at the track computer cuts power, but from testing i've had my best 60' and times launching at 1k and just letting converter flash then actually loading her up. If there was anyway to remove watever is limiting or cutting power on hard launches it would be a big difference since it was a pretty violent launch i'm guessing thats why computer killed it.
Yep - Take the TC clutch out of the equation completely, for any number of reasons.
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johnday in BFE (04-17-2018)
04-17-2018, 10:22 PM
#20
I find that sometimes it launches great with a full brake torqued (2500rpm) start, but usually the rpm dips a little (No Nos), fastest NN launch is about 2000rpm, then floor it as I let off the brake, if it flashes to 2600, it launches mint. On Nos, well, it really just doesn't matter lol. I just torque it up to around 2K, and as soon as the pedal is floored, 600ft/lbs hits and it gets out!.