Problem with UTEC: Unable to rev past stock limiter on dyno. But works on street.
#1
Problem with UTEC: Unable to rev past stock limiter on dyno. But works on street.
I am out of town right now getting my 92 Maxima VQ35 Automatic tuned on a DynoJet. I am running a UTEC. I have Open Loop Fuel activated and have my rev limiter set to 7200 rpm at the moment. It works great on the street in 1st and 2nd gear. I have never topped out 3rd gear on the street or the track before.
But on the dyno, the stock rev limiter keeps engaging. We have done 15 or so runs in 3rd gear and we can't get it to rev any higher than 6600 rpm.
I found out I am making a ton of power at 6600rpm (271whp) and still climbing strong! I will definitely need to rev this engine out to probably at least 7500 rpm.
Does anybody have ANY ideas? TurboXS is closed on the weekends and we can't get a hold of anybody. I am hoping to be able to solve this problem by Sunday.
Thanks in advance.
But on the dyno, the stock rev limiter keeps engaging. We have done 15 or so runs in 3rd gear and we can't get it to rev any higher than 6600 rpm.
I found out I am making a ton of power at 6600rpm (271whp) and still climbing strong! I will definitely need to rev this engine out to probably at least 7500 rpm.
Does anybody have ANY ideas? TurboXS is closed on the weekends and we can't get a hold of anybody. I am hoping to be able to solve this problem by Sunday.
Thanks in advance.
#4
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It's your fuel map... it's got a nasty hole. That's why you're unloading in third. Unlengthen the injector pulse another millisecond, just tune the NOS timing, you'll run 9's
Last edited by sparks03max; 02-06-2010 at 02:15 PM.
#5
Nice power Aaron, even though I'm sure there's more in it when you get it to rev higher in 3rd. You could try calling some shops that are familiar with tuning the utec on a vq35 or try asking people on my350z. Good luck!
#10
AHH i KNEW IT
i just dont know how to fix it HAHAHa dam
#12
I am being limited at 125 mph according to my dyno sheets, which is basically the same thing considering the speedometer is showing 128mph exactly.
I have a 6spd ECU already in order to get my cruise control working. I just have to install it. That should allow a much higher speed limiter.
The UTEC doesn't allow you to change the speed limiter.
Last edited by Aaron92SE; 02-08-2010 at 10:44 AM. Reason: Edited numbers for better accuracy
#13
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Location: Middleboro/Carver, Ma
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Damn I wish you could have gotten ahold of me, moms I35 rode (re: shifted, drove, etc) fine with no vss for several months, only the lack of speedo, & of course a cel, was noticed.
WOW, congrats, and as to be expected you def. owe me a steak + beer, though I didn't see it happening @ 6.5k!!!!!!
WOW, congrats, and as to be expected you def. owe me a steak + beer, though I didn't see it happening @ 6.5k!!!!!!
#14
Damn I wish you could have gotten ahold of me, moms I35 rode (re: shifted, drove, etc) fine with no vss for several months, only the lack of speedo, & of course a cel, was noticed.
WOW, congrats, and as to be expected you def. owe me a steak + beer, though I didn't see it happening @ 6.5k!!!!!!
WOW, congrats, and as to be expected you def. owe me a steak + beer, though I didn't see it happening @ 6.5k!!!!!!
I did 271whp with SAE. Uncorrected, I made 277. STD, I made 278.
#15
the limit on the 5.5 auto ECU is about 135... however as deckdout said, the UTEC should be able to get rid of such limiter... should look something like dandy's graph where it has a major dip for probebly 100rpm then back to regular pass the stock limiter... i hear 7500rpm, any HR equipments with this motor, it would be nice to see a motor with HR upgrades and dyno #
#17
the limit on the 5.5 auto ECU is about 135... however as deckdout said, the UTEC should be able to get rid of such limiter... should look something like dandy's graph where it has a major dip for probebly 100rpm then back to regular pass the stock limiter... i hear 7500rpm, any HR equipments with this motor, it would be nice to see a motor with HR upgrades and dyno #
My speed limiter is at exactly 128mph according to my speedometer. Every speedometer is different though. 128-135mph, same difference.
I have already swapped in a 6spd ECU and it's working great now.
#19
I now have a 6spd ECM install, which either doesn't have a speed limiter at all or has a 149mph speed limiter. Either are fine for the type of racing I'm doing, 1/4 mile.
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