Is it safe to rev a stock block VQ35DE to 7500 rpm? Is there any durability issues I should be aware of? AFAIK, I have heard a few cases of the rod bolts stretching when the VQ is spun that high. Is there anyone doing this? I am currently waiting for a set of stiffer valve springs & retainers so I know my head & valvetrain can handle it. BTW I have a non-revup motor. Thanks.

 

If its not revup I dont suggest doing that. I have the revup motor and I usually shift at 7200 so im quite sure it'll handle 7500.

 

how are you shifting at 7200 without a reflash. What about the rev limiter

 

What constitutes a "revup" motor? What is all involved with that mod? What is the stock rev limiter set at? What is the rev limiter set at with a "revup" motor? Sorry, Z-newbie here...

 

Revup motor is a 300hp motor that came in 35th anniversay 05' Z's and 05' track models. All 06' have the revups. They redline at 7000rpm. Regular 287hp motors redline at 6600rpm. Revups have different cams, lower plenum, pistons, have exhaust cam timing. They do better mod for mod than 287hp motors NA-cuz of the exhaust timing. Over the next few months I hope their owners will start to show this at the track, Ive seen it on the dyno just need to see it happen.

 

+1

 

don't think you can do that unless you go for dual springs... and possibly you will bend your valves even with stronger valve springs. Also your rods might not be strong enough (at least rod bolts) to go that high and it might result in blown engine.. your power starts to drop off from 6200rpm already, there is not too much point for you to rev to 7500rpm though unless you put a set of cams in or use 2005 lower intake plenum to shift the max power up.

Check out my thread... accident happened from page 2, bent valves going 7500/7600rpm or so even with stronger nismo valve springs... and with ferrea valvetrain sets and pistons + rods, I am doing 8000rpm anytime any day now.

Good luck with your project!

https://my350z.com/forum/na-builds/159519-photos-on-engine-rebuild-n-a-2.html

cheers,

richie

 

FWIW=-Mike @AAM revs to 7500rpm's on stock block/valvetrain on a regular motor. He also pushes 450+rwhp....

 

Honestly I have raced and tried this as an experiment. I have shifted below redline around 6700, at redline 7000, and above redline 7200. Even though I dont have peak power at 7200, I shift at that rpm to have enough momentum and hit the "sweet spot" for the next gear. Thank you alberto for explaining what the "Revup" motor consisted of, made my job easier.

 

I'm sure its possible to do it, but its not too safe on a 287 motor. Does he actually shift at 7500 or the rev limiter has been raised to 7500? Most times they raise the rev limiter but they dont shift at that rpm because of the increased cylinder pressures and revolutions.

 

how are you shifting at 7200 when the rev limiter is set at 7000? that was the question

 

Reving a stock 03-04 VQ motor to 7500 rpms, is a bad idea IMHO. You can and will cause problems with the valve train as well as the stock rods...Besides, the power falls of after 6200 rpms anyway on the VQ...

 

Redline starts at 7k not rev limiter. I havent hit revlimiter yet but i'm sure its around 7300 or 7400. Does that answer your question?

 

97supratt,

I might be wrong here, but I was told and heard many people saying that the revup motor's redline and rev limiter are the same which is 7000rpm... and the reson you can shift at higher rpm is most likely because the analog is not as accurate as the digital readings... so when you see 7200 or 7300 on the clock, most likely it is just around 7000rpm...

cheers,

richie

 

It definitely takes a reflash to get to 7500. I shifted constantly at 7300-7500 and subsequently threw a rod out the side of the block. My entire head was blue, due to high levels of heat. I was pushing 440rwhp during the cold temps of winter on stock block. Unless you are willing to punish your wallet, I would not recommend this on stock block and heads.

 

Maybe. But i'm going by what i'm seeing. I'm sure its not actual rpm because what I see is not what is actually occuring.

 

makes sense

 

i know personally and for a fact that 7000rpm on a 03 motor is perfectly safe for abuse with no side effects. 7500rpm however, i am not sure i would try. theres is no power up there anyway unless you have cams?

 

to go up to 7500 and get abused at that sector of the powerband what would need to be replaced?

 

Judging by the responses I'll keep the revlimit @ 7100-7200 (I'm not be spinning the VQ that high frequently......... well maybe if I have to get somewhere fast). I just installed the Nismo R-tune cams on my car and the motor want to rev beyond the 6600 rpm redline. One more question, will the 5AT be able to handle 7100-7200 WOT shifts w/o slipping? Thanks again!