About 50-60kw difference isn't it mikey? Nice power curve though. Will be very interested to see how the final tune at full boost will be though!
Awesome. So why does it make so much more power than the VG everywhere given the same capacity and 2 Turbo's? Edit: Just read about the bigger valves, etc etc... An epic upgrade for the Z, without bastardising the car. :zlove: Looking forward to seeing how far the lap times come down.
Actually we discovered the dyno was set on shoot out 8 not 6, so the figures are a bit optomistic in both power and response as the ramp rate is different. Sorry about that.
Update Dry sump tank, Oil system now carries 15 litres of oil. Also electric powersteering pump mounted left rear in the car inside this custom box.
New custom billet steel flywheel to suit 7 1/4 inch (184mm)twin plate motorsport clutch. 4.5kg and suits bell housing adapter.
After busting a head gasket at Superlap on the stock motor and finding it's limit, we are now bulding a tuff motor and increasing to 3.5 litre. Using Darton Sleave kit (closed deck) using VQ35HR head gaskets which are much better. This requires modifying the engines coolant flow and does away with the two rear thermostats, yes the VQ30DET runs three thermostats and high temp ones for emissions reasons, not good for racing. We are using a VQ35 crank, forged rods and pistons. Whilst at it we have slightly ported and then polished the ports and domes. We relieved the dome to match the 95.5mm pistons up from 93mm. Also adding ARP main studs.
Wait till you see the ports on a VQ40 John, you will want to find a way to fit those heads ASAP I tried to get my hands on a long block from my project car but didn't quite sweet talk enough I think ha ha! will be an awesome eng option when they become cheaper - except for the hight is a little intimidating.
Hmm could be good although more stroke won't rev as too much stroke. The VQ35HR is the go, 12mm spark plugs, semi polished domes, nice ports, bigger valves I think, girdle and 4 bolt mains part of the block, wasted down cams, twin cam timing, cam senser per cam and crank trigger, lighter parts etc..
Standard VQ30 cast pistons which are hard anodised ring lanzs and tops which is pretty cool. New VQ35 Wiseco forged pistons which are about 10g lighter and much stronger.
only issue is that lately the wisecos for the VQ35s are having an increase in failure rates due to the top ring land being too narrow/thin. They seem to be ok for NA applications but for any build with an atmosphere multiplier (snail) the pistons simply can't withstand the abuse and fail continuously. I didn't read where you are going for a boosted application so I assume you'll be ok but if you are planning to hang a snail(s) I would highly suggest looking into a different piston (CP). Good luck!
it will be boosted thought the wisecos were known for the tallest top ring land or is that just for the VG wisecos?
Boost Thanks for the info, I think. HMmmmm YES I was planning on up to 25psi and should make 500rwkw. I had a look at them and they look ok although have a deep degassing grove. I had them Croygenic trated ( Cryo Tough treatment) along with along with conrods, studs etc might help. We are using E85 fuel to, which runs cool and detonation is not an issue.
More info Hey Tech@EPR I was further concerned after seeing your profile and some of your threads and seeing the engines you work on. You are obviously not the average Joe. Wondering if you know some actual examples or maybe links of failures. Including what boost and more important what fuel, as your pump fuel over there is not as good as ours, plus I am running 85% alcohol fuel. I have had these pistons balanced so can't return them now.
past three VQs that were boost have failed due to ring&ring land failure. Issue is that the ring land itself is not broad enough on the shoulders to accommodate the added stress levels of a compounded atmosphere coupled with ignition. The rings failed as well due to the fact that the ring land is so little. Small ring land/small ring. Its like using a paper plate vs a good dinner plate to pile on the food. paper plate always fails. Wiseco has since been notified of these issues and is working on updating the design que but honestly I would suggest you looking into another piston since you have the outdated versions at your disposal. Cryo treating them may help but from my point of view I dont trust may as much as I do will....if that makes any sense to you. Overall if you plan to run some serious boost and put abuse through the engine it would be in your best interest (my professional suggestion/opinion) to also look into an upgraded ring set. The rings supplied from Wiseco do work but lets face it...if you have access to getting better rings that have better oil control and better sealing abilities by all means invest in them. You're about to spend (if you already haven't or will continue) a lot of money on this assembly and car. The last thing I know you don't want is engine failure and issues early on in the game or at an event where it proves catastrophic. feel free to email me if you'd like. Im here to help if you need anything.
