12-05-2012, 10:30 PM
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#40 (permalink)
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Base Member
Join Date: Oct 2010
Location: Billings, Montana
Posts: 164
Drives: 370Z Touring 6MT
Rep Power: 15
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Quote:
Originally Posted by 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.
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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.
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