Raising The Redline On The Z

Originally Posted by 1slow370

Motor never blew, it's just going to a new home as the car has been converted to awd so it needs turbos now lol

It does have a dry sump and an ati damper which do go a long way to keeping the crank alive.

Originally Posted by THE BULL

It's a hit or miss and this is a topic you don't want any misses.

Raising a the redline and tuning for it will move your power band and leave your low/mid range a bit bland.



Then ask yourself where in that rev-range will you see yourself and you can come up with a better answer. Tons of things at play here.



A balanced crank/rods with an ATI and great oil pump clearances should last quite a bit but it's all determined on driver/abuse/tune.



Whoever plans on this should have coolers, damper, tune and should open their filters.



Rev should be determined on Rod/stroke ratio + mods + tune. Even then it's not a guarantee.



It appears the VHR has a 1.72 ratio (if math is right)

For better comparision:

Honda K24s have a 1.54 ratio and with a type S pump they are usually revved to 8k

While it's younger brother the K20 has a 1.62 ratio and these are take to 9k every day.

The odd child would be the F20c with a ratio of 1.81 and these are production engines with a standard 9k rev limit.



I understand that how some may feel about Hondas however these high revvers can provide great info at that ratio as long as everything else holds 8k should be feasible.

Originally Posted by SteveVQ

Definitely have you confused with someone else then. My bad. On another note, you converted a 370 to AWD? That's sick! Link to build please?

Originally Posted by 1slow370

its not in a build thread yet. i tend to finish a car first then spend a couple days making a massive build post then drop it and you guys go nuts.

Originally Posted by 1slow370

honestly in my experience the best reason not to raise the rev limit on the z is that the trans is garbage at high rev's it shifts like crap past 7000 and the synchros cant handle it. once liberty actually releases their cd009 faceplates that wont be a problem anymore but they are already a year behind on it. other reasons to not rev out a z is there is little to no support for the induction system to actually work up there. you fight the vvel and ecu, cams are expensive, you have to deal with the oil pump which requires tearing the whole motor apart, and all the manifolds on the market don't make appreciable power past 7800. torque starts dropping like a rock. if you look at the dynos from my car vs the dynos from soho's stroker you can see we made roughly the same hp but the curves are massively different.

Originally Posted by Zingston

You're correct. I'm already planning to go nuts!

Originally Posted by 1slow370

honestly in my experience the best reason not to raise the rev limit on the z is that the trans is garbage at high rev's it shifts like crap past 7000 and the synchros cant handle it. once liberty actually releases their cd009 faceplates that wont be a problem anymore but they are already a year behind on it. other reasons to not rev out a z is there is little to no support for the induction system to actually work up there. you fight the vvel and ecu, cams are expensive, you have to deal with the oil pump which requires tearing the whole motor apart, and all the manifolds on the market don't make appreciable power past 7800. torque starts dropping like a rock. if you look at the dynos from my car vs the dynos from soho's stroker you can see we made roughly the same hp but the curves are massively different.