VQ35 3700 rpm Power Drop
#1
VQ35 3700 rpm Power Drop
I don't know if this is the correct section for these questions, but I figured it was a good place to start.
My 5.5 6MT exhibits a power drop/dip between 3500 and 4000 rpm as shown by the dyno below. The engine is completely stock, was dyno'd in 3rd gear (may be wrong, don't have the raw data) and the car had aftermarket wheels & 6th gen brakes.
I originally believed this power loss was due to a MAF issue which caused hesitation upon throttle applications greater than 50% at this engine speed (originally posetd: http://forums.maxima.org/7342248-post48.html). Although I no longer believe this is the case as the new MAF has corrected the hesitation, but not the power dip (as felt by my butt dyno, recently calibrated).
Therefore, my questions are:
-Is this normal (other stock/baselines seem to corroborate, noted below)?
-What causes this, and how can it be corrected (VIAS activation at 3600rpm, bad knock sensor)?
What say the all motor gurus?
http://www.nissanclub.com/forums/eng...-vs-stock.html
http://forums.maxima.org/dyno-discus...-6mt-dyno.html
http://forums.maxima.org/dyno-discus...6mt-stock.html
If you ignore the performance post 5000 rpm:
http://forums.maxima.org/dyno-discus...irst-dyno.html
My 5.5 6MT exhibits a power drop/dip between 3500 and 4000 rpm as shown by the dyno below. The engine is completely stock, was dyno'd in 3rd gear (may be wrong, don't have the raw data) and the car had aftermarket wheels & 6th gen brakes.
I originally believed this power loss was due to a MAF issue which caused hesitation upon throttle applications greater than 50% at this engine speed (originally posetd: http://forums.maxima.org/7342248-post48.html). Although I no longer believe this is the case as the new MAF has corrected the hesitation, but not the power dip (as felt by my butt dyno, recently calibrated).
Therefore, my questions are:
-Is this normal (other stock/baselines seem to corroborate, noted below)?
-What causes this, and how can it be corrected (VIAS activation at 3600rpm, bad knock sensor)?
What say the all motor gurus?
http://www.nissanclub.com/forums/eng...-vs-stock.html
http://forums.maxima.org/dyno-discus...-6mt-dyno.html
http://forums.maxima.org/dyno-discus...6mt-stock.html
If you ignore the performance post 5000 rpm:
http://forums.maxima.org/dyno-discus...irst-dyno.html
Last edited by 2slow; 01-01-2010 at 03:11 PM.
#4
#6
To he best of my knowledge I do not have an ignition issue. The aforementioned hesitation has not reoccurred after the 2k1 MAF installation.
#9
Aside from removing the VIAS system, is there any way to improve the system?
I seem to recall from a prior thread, which I cannot locate, the VIAS generally closes (unintentionally) at higher engine speeds which also hurts outpput. Is this correct?
I seem to recall from a prior thread, which I cannot locate, the VIAS generally closes (unintentionally) at higher engine speeds which also hurts outpput. Is this correct?
#10
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I don't see that being VIAS related at all. I would first take the knock sensor out of the equation, I wouldn't be suprised if it's tripping right there and pulling timing out the ***.
Silly question but what Octane was that dyno done with?
Silly question but what Octane was that dyno done with?
#11
The runs were made with 93 octane E10 and an ambient temperature of ~55 degrees Fahrenheit.
How would you recommend testing the knock sensor, or dyno'ing without one? Perhaps remove the sensor from the engine and use a jumper to ground it.
#12
#13
I guess the opposite argument can be tested (VIAS versus other causes). This may need wait a few days until it's either not snowing or stupid cold.
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