FI with continous high speed driving 130MPH+

LafitteZ

my z can hit 190. with just like it is. Im pretty sure. I can leave it in 6th gear and punch it at 80 and it carries me to 160 and 170 pretty damn fast. yes these guys are completely right. with the right aftermarket stuff you shouldnt see and cooling problems at all.

elperuano

Wow, 6th at 80 to 160-170. I wouldn't do it like that. Car will be under a lot of load and running hard too long..

conmam

In my opinion, since I already owned a GT3-RS MK2, I have a very high expectation of a sports cars. Believe me that I paid $154,752 OTD back in 2009 for that monster and I could drive hard all day long at 130 mph + , taking corners at 1.3+G at 8000 rpm with ease and a piece of mind. By the way, my GT3RS consumed about 1 quart of oil every 800 miles during medium to hard driving. Porsche stated that it was absolutely normal because the engine were meant consume oil ... tremendously just like that.

Now, I am sure this 370Z can achieve at least 90% of that performance if properly and professionally modified , and better yet, it will cost way less than what I paid for the GT3-RS back then. The VQ37 engine bottom end is much better than most people think. I don't believe that there is any problem with the stock bottom end to spin at 8000 rpm. However, the weak link is the VVEL camless ladder assembly. Now, that is the very reason why I do not raise the factory red line to 8000 rpm. I still leave it at the cutoff point at 7600 rpm.

Like I said, the only flaw of this whole design is the excessive heat generated from the engine... and excessive heat does kill engine and other components HARD. If you can liberate the heat as what I have done, this engine can take very good high rpm and load abuse ( up to 7500 rpm only ). The engine may not last as long as my GT3RS MK2, but it will be pretty close...

elperuano

Uhhh huh? I simply said to start low on 6th gear 80 jus puts more load and stress on the motor. It can be done but I wouldn't do it like that. I wouldn't start a full run from 6th gear going 50 all the way to 170. It's simply too low. If I'm running wot I can switch from 5th to 6th at 100 or more.

I know the VQ motor pretty well, this isn't my first boosted VQ. I don't have personal experience with Porsche jus from what I read and a few friends so I can't comment on Porsche at all. VQ motor is nothing like Porsche.

conmam

I personally have built a VQ35DE rev up engine for a friend back in 2011. Stock block with cylinder liner re-enforcement , Mahle 10.1 Forged Pistons with Ceramic coating, Custom Titanium alloy rods. Displacement still at 3.5L. Stock crank nitrited. ARP main bolts and stock head bolts and head gaskets .This engine has been subjected to daily driving plus quite a few weekend tracks. It was operated very very often at 6000+ rpm and pretty often stayed at 8200 rpm. Engine was boosted with Greddy TT at 13 psi, ended up with ~600 whp @ 7800 rpm. Engine has 19000 miles on it. Absolutely no problems at all..... so far , at least.

Now, both the 35HR and 37HR bottom ends are a bit better and more rigid than the 35DE one. I am 100% sure of that. With internal modifications just like the DE motor ( in addition with a chromemoly steel crank and head studs ), these engines are pretty darn close to my H6 3.8L GT3 motor. The only limitation on the rpm is the VQ37, due to the VVEL ladder. Other than that, no problem at all for solid 8000 rpm redline once you built them.

The only thing my Porsche GT3 H6 motor had that the HR engines do not : It has forged aluminum block and head, whereas our Nissan blocks and heads are all cast aluminum. That, can make a difference in engine rigidity, I think.

conmam

Can you let me know your mods since you stated from 80 mph ( in 6th gear ) to 170 mph pretty fast. I am highly interested. Thank you