Increasing the RPM range to over 7k
06-14-2004, 05:44 PM
#41
People need to start blowing up these engines so we know what they can take. 
I don't know of a single busted VQ35 motor (aside from bluefish's with that ... 300 shot?) from forced induction or overrevving. Although I'm sure there must be a few somewhere.
I don't know of a single busted VQ35 motor (aside from bluefish's with that ... 300 shot?) from forced induction or overrevving. Although I'm sure there must be a few somewhere.
Last edited by Traffic; 06-14-2004 at 05:46 PM.
06-14-2004, 06:17 PM
#42
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I thought alll the 5at people w/fi were getting the ts flash so that the tranny shifts right and were achiveing this because of the rev limiter being raied to 7200? I would really like to know the real answer because I just purchased the vortech kit and was planing on this mod and info would definatly hepl!
06-14-2004, 09:18 PM
#43
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reading through this topic makes me wondering if i raise my rpm to 7200, a stronger rod will be a good idea.but how about valv springs?
does it gonna do any goods?
does it gonna do any goods?
06-15-2004, 02:16 PM
#45
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Originally posted by 96sleeper
There are tons of VQ30DE guys that are revving to 7200rpm. I have 140,000 miles on my engine and have been revving to 7000rpm for the last 30,000 miles. No problems yet. I would venture to say that a VQ35DE would have no problems either. I am within 6hp of my peak hp at 7000rpm with a different intake manifold, no cams. I think JWT said that the valves start to float at 7300rpm on a VQ30DE, but we have one guy revving to 8000rpm with no problems yet. (I am sure there will be long term)
There are tons of VQ30DE guys that are revving to 7200rpm. I have 140,000 miles on my engine and have been revving to 7000rpm for the last 30,000 miles. No problems yet. I would venture to say that a VQ35DE would have no problems either. I am within 6hp of my peak hp at 7000rpm with a different intake manifold, no cams. I think JWT said that the valves start to float at 7300rpm on a VQ30DE, but we have one guy revving to 8000rpm with no problems yet. (I am sure there will be long term)
http://forums.maxima.org/showthread.php?t=311222&page=2
I would think that a 350Z from 7000-7200RPM could rev there all day long the valvetrain of the Z is much lighter than the vq 30 but stroke limits it from going much higher.
06-15-2004, 03:37 PM
#46
Originally posted by D'oh
Yeah, I saw you talking about this, so I decided to give it a shot while my computer was crunching on an FEA analysis. Turned out pretty cool if I do say so myself.
One thing, it seems like the speeds in each gear are a bit high, I double checked the gear ratios and they seem fine, so the only thing left is the overall tire diameter. The tire calculators give a diameter of 26.6" for a 245/45-18 tire, but that gives us about 64 MPH in second gear. I was thinking we were closer to 62, which is corresponds to a 26" tire, but whatever, the differences would simply be a scaling of the curves, and they would still look the same with respect to eachother.
Later,
D'oh!
Yeah, I saw you talking about this, so I decided to give it a shot while my computer was crunching on an FEA analysis. Turned out pretty cool if I do say so myself.
One thing, it seems like the speeds in each gear are a bit high, I double checked the gear ratios and they seem fine, so the only thing left is the overall tire diameter. The tire calculators give a diameter of 26.6" for a 245/45-18 tire, but that gives us about 64 MPH in second gear. I was thinking we were closer to 62, which is corresponds to a 26" tire, but whatever, the differences would simply be a scaling of the curves, and they would still look the same with respect to eachother.
Later,
D'oh!
The tire's effective diameter is going to be less because when the wheel is loaded, the radius decreases due to tire deflection. That's probably why you recall 62mph at the top of 2nd gear.
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