tekk

I saw on the nismo site what appeared to be a head and other parts designed to raise the comrpession of the VQ35. Correct me if I'm wrong, but so far, 280-290whp has been achieved and confirmed doable on the Z (not counting the one guy in pr)... and in these cases, the compression ratio was unchanged. If the compression were raised from 10.3:1 to 12:1, wouldn't 300whp n/a be more easily attained?

Also, it looks like there are VTC parts that are designed to give more aggressive variable timing at higher revs. These parts should improve the top end performance of the VQ (without sacraficing idle), no? Especially combined with the nismo cams and ecu.

With all of these parts, I would think that the 280/287hp VQs should be able to do 300whp without getting too exotic. Any thoughts? Or am I not understanding things correctly?

If this is right, hopefully Nismo will come through on the new VQ35 too... and maybe that engine will be able to pass 300whp...?

here are some links:
nismo: http://www.nismo.co.jp/
nismo head: http://www.nismo.co.jp/products/engine/parts03.html
other products: http://www.nismo.co.jp/products/index.html

you can translate pages here: http://babelfish.altavista.com/

tekk

wow. 90+ enthusiests read this and no one has anything to say? not even that im crazy? it seems to me like nissan/nismo is sitting on an bmw/m3 killer, and they just dont do anything. maybe the interest in this thread is why

pimp1911

The Nismo heads have been talked on for the past 2 years. And they are little extreme for the car. Going from 10.3 to 12.1 will put you in race gas land. Follow this link.

https://my350z.com/forum/showthread....threadid=57168

tekk

thanks!

Kolia

iTrader: (2)

I sit in one every morning !

Fletch69z

iTrader: (50)

I wish I could get 300 NA whp. Too bad that would cost a ton of money, haha.

Jason@Performance

iTrader: (11)

to get the NISMO 46cc heads to work you have to get a few other parts to make them work... also you have to modify the heads in a way which actually lowers the compression to someting more like low 11...

They were working on getting the super taiku heads to the states which used the stock valves but were a higher compression... havent heard much about it since...

Wired 24/7

iTrader: (2)

I don't know if I'd want a CR that high when the best gas available to me is 91....

DanielW

iTrader: (27)

so how would this setup run on 93 octane?

ke0ki2k

iTrader: (2)

well...if you're hardcore...go to briancrower.com...he makes a stroker kit...5 grand or so...goes from 3.5 to up to 4.15 liters...and he makes cams that you'll have to get with it cause it raises the displacement by lengthening the stroke so the timing will be radically different..but...330+ rwhp N/A is possible with his stroker kit & cams & tune and stuff :/

ke0ki2k

iTrader: (2)

or you could just get some 11.1:1 compression CP forged pistons...those would help

Sean

Once you hit 10.25:1 you can't get full potential even out of 94 octane gas. 99.5 octane that you get from a local marina will do the trick easily. There is a mathmatical formula for compression and octane, but I don't have the engine building book it was listed in anymore, maybe someone else has it?

Sean

I was paying 3.10 a gallon back in the early 90's (Maybe it was only 2.10) They can't legal put it in your car as there is not road tax paid , but they can put it in gas cans.

you can make your own 99.5 by mixing Cam2 (the 114 or so) and super unleaded. If you mix it to 96 octane you are good to 13 to 1 compression.

Z1 Performance

iTrader: (564)

??

there are factory cars with 11.0:1 and higher than run on 91 octane

whatever book you are reading, use it to line the birdcage or something...it sounds ancient

Q45tech

Switch Totally to E85 and accept the cold start problems and 30% higher fuel consumption per mile.

rocks

iTrader: (1)

Custom ground high lift cams, im talking like .550" lift and huge duration. Your car would idle about 1500+ rpms though and probably not make anypower untill 4k rpms but then it would pull like crazy. A friend of mine built a 3.8l gm engine in his firbird with a cam that big. He also had ported heads with big valves. One thing though is even his ported heads didnt flow as good as stock vq heads. He ran a 12.9 in it and a firebird is a heavy *** car. His 3.8 had 9.1:1 compression and made that much power. Its doable but people are going about it the wrong way.

Get the nismo cam blanks i think they can be ground to .550" lift. You would probably have to notch the pistons for valve clearance though. A good machine shop can do that.

So in this order i think you would need.
Cams around .550" lift
3.9 final drive.
Larger plenum
Mild ported heads to just clean up the flow.
Full exhaust with headers and no cats.
A ecu that will control the cams so you can have a stable idle.
Stronger valve train. Ferrea stuff.
Leave your compression the same it wont hurt anything.

Z1 Performance

iTrader: (564)

a 5% gain is nothing to sneeze at. On a typical bolt on car, making in the 260-270range at the wheels, that's a 13-15 whp gain. Surely the guy upping compression, is also going to do cams, etc etc at the same time, making the motor not only make more power, but more torque, and operate with a great range of overall efficiency

And you don't need cams with anywhere near that lift...though it would scream!!!!

rocks

iTrader: (1)

With the variable cam timing i think it would be highly possible to have a normal idle with crazy huge cams. The car would be a beast with cams like that. If you had less overlap in huge lift cams with fi it would be easy as hell to make huge horsepower numbers on pump gas. I just wonder how much custom cams would cost. i need a engine to experiment with heh.

Z1 Performance

iTrader: (564)

I wouldn't say normal idle, but certainly more normal

The issue is the VTC - only a couple options exist to manipulate it right now...hopefully in the future that changes

rocks

iTrader: (1)

Myabe 1200 rpms or so lol. That should be bearable for a daily driver. I wonder if it would lope.