ur no SR20...hope u got upgraded internals....

 

Stock SR20s lay down 476.9hp/501.0tq or 428.1hp/379.3tq on stock rods?

 

Just like i've seen , the Vq mysteriously was made for super high revs. Im sure it could take 9000rpm

 

FYI, the VQ has a shorter stroke than the SR20DE by 12.7 MM and has a higher rod to stroke ratio...So if an SR can do it, the VQ can do it for damn sure...

 

SOunds like I have to say something like

One small step for one maxima owner,
One Giant leap for Maxima owners

 

Dave, actually you nailed that on the head, the NSX's redline IS 8000rpms... maybe that's why they're so damn expensive.. And my VQ has already gone well beyond 8000rpms... 9,000 or so to be exact... missing 4th and hitting 2nd at the track does wonders... and now my valves tick a little, but she still runs strong!

 

Can you just use the VI from the newer maxima's or is it better to use the mevi? Whats the best route and what are you looking at for prices here.

 

some people seem to think it won't work due to hood clearance issues and how they would get it to activate. I guess we'll just have to wait and see if anyone can get it to fit.

 

9,000 rpms? WTF on stock cams and valve springs and retainers? You must be crazy?

 

its called a mis-shift. not like he purposely revved the car to 9 grand.

 

What does the fact that he has stock cams have to do with it??

 

Can't cams break?

 

I've never heard of cams breaking from an over-rev. EVER!! As a matter of fact, the only time if heard of cams snapping is improper installation(aftermarket of course). And besides, aren't the JWT cams made using OE blanks?? Same material...

 

The only thing I can think of is aren't Honda engines undersquare and the Vq30 is oversquare?

 

4-6 weeks to get the ECU......it was over 10 weeks for me

 

The NSX C32A is oversquare too, but the VQ still has a shorter stroke. 73.3 MM compared to the NSX's 78 MM.

 

I did it worse than that and no probs, i went to redline in 2nd and shifted back down to first then floored it i still didnt let up till the car slowed down. I had a stupid moment and didnt know i put it in first. It probably went close to 11000 rpm

 

Isn't it's duration? The valves don't have time to close before ingnition takes place and won't that cause crazy valve knock? I might be wrong but I never heard of anybody increasing their revs alot without changing cams along with valve train?

I miss read it seemed to me that he said that his car revs at 9,000 rpm normally. I didn't read it was a miss shift.

 

Why wouldn't the valves have time to close?? The valve timing is the same no matter what the RPM is since it is mechanical and has no variable valve timing. So if the valves are closed in time for ignition at 3000 RPM, they will close in time at 9000 RPM. You might be referring to valve float, but the cam has nothing to do with that.

That happens when the spring doesn't have enough tension to keep the shim pressed up against the cam lobe.

The reason ppl swap out their cams with upgraded valvetrains is because without the increased breathing capabilities of the upgraded cams, the extra revs would be useless since the engine would be running out of breath.

 

IIRC...there is a point at which you overcome the valve springs ability to close the valve before the next opening called 'valve float'.

I've heard it before on Hondas.

 

I just edited my message to include that possibility. But he said it as if it was because of the cams, when it happens because of insufficient valve spring tension...

 

I said both. But I still think there is something to do with a cam duration. I know that you need stronger valve springs to stop valve float, but I think cams help with that too.

 

This should be very very interesting to see. Awesome that someone is taking the next step in N/A performance.


As for the video of my car, that was stock ECU in that video. There are no videos of my car on the net with 7200rpm limiter. I have some, but none are uploaded.

 

Well cams determine how long the valve is open, so it too would need to allow enough time for the spring to close the valve at sky high rpm.

I think that's referred too as duration?

 

Isn't duration how long the valve stays open? Either way, you match the valve springs to the cam, not the other way around.

And allow enough time?? It's all mechanical, so everything happens in sync with each other. It's not like the cams says "hmm, let me wait for that damn valve to close so i can continue" Since the cam can't wait, that spring better have the tension to keep up.

 

That's what I'm saying. The longer the valve is open due to duration of the cam lobe, the LESS time there is for the spring to close the valve.

The higher the rpm, the faster the springs must react before the next cycle. If the duration of the cam is long, that leaves less time for the spring to close the valve before the next cycle.

 

I agree with everything you're saying. My point is the valve springs have everything to do with valve float, not the cams(in response to ABK)

The valve is to a larger lobe what the piston is to a longer stroke. They have to cover a greater distance in the same amount of time, thus they have to travel faster.*Enter the more resistant valve spring*

Or in the context of stock cams, the spring cannot expand quickly enough at high RPM to allow the shim to follow the lobe...

 

Ok...I see your point now.

 

thanks guys, I never knew exactly what valve float was, but you certainly cleared it up

 

Good talk.... I guess.

 

This reminds me of a cartoon I saw a long time ago in a car salesman's office. The cartoon showed a teenager with some hot looking car in the background. The kid says to a shocked looking salesman in a nonchalant way: "Yeah, it drove okay, but the valves float at 9000 rpm."

 

thats funny i should go test drive an old car without a rev limmiter and come back and tell the salesman that

 

LOL that reminds me about me testdriving cars from a pc of **** dealerships. All of them had rev limiters and I was bouncing off them like crazy, but the fun part is that they let you take the car by yourself. I always picked the one with the most power from the lot and made sure it was stickshift. It's some great fun!!!

 

I wonder if the "You break it, you buy it" saying applies.

S