I bet if proper timing is pulled to stave off detonation, I bet it will last a while at 6psi.

 

Great work what is this car going to be used for drag or the track? love to see a vid.

 

I am not speaking about any one brand or line of engines in particular. You are correct in stating that upgrading the valvetrain will alleviate upper end failures.
Are you saying that engine failures in the VQ engies are occuring at high rpm's? The VQ35 is a big bore short stroke engine 95.5mm x 81.4mm which is another reason I find it odd that the bottom end failures are being attributed to excessive rpm.
The mustang 4.6L which has a bore and stroke of 90.2mm x 90.0mm is being spun to 7000rpm at 10-12psi of boost on crappy powder metal rods without failure for the most part. In the mustangs the engines that are failing are typically doing it at or below normal redline which is why fuel and timing are most often to blame. The advantage we have with the mustngs is the amount of data we are able to datalog directly from th PCM. I have been searching for the last 2 days to find as much data as possible on engine failures in the VQ35 but I've been coming up empty on specifics.
I doubt that 6 psi on the Z06 engine will be an issue on a conservative tune.
At an increase of 6.8% per pound of boost a 6psi of boost should give the car something in the area of 710fwhp


This is what a broken rod on a mustang looks like

 

We have the same project in here and the car got 552 whp c6 STS turbos but he lost his stick gear on the dyno poor thing couldn't make it.

 

While titanium is strong for it's weight it is also more brittle than steel and has other issues that come with it that can cause issues.

For example, if the rod bolts are not properly coated or of the right material you could get galling with could be an issue if you ever take them out.

I also do not believe that the statement of hp/L is necessarily an accurate measurment for stress analysis. I think that you are going to mislead people by saying such. Effeciency in the entire system could make up for that amount of extra HP.

It could easily be turned around to say that maybe the LSx is less effecient than the VQ.

To everyone else look at the above statement as more so debate rather than fact as I have no clue as to efeciency ratings of each engine and would bet that the LS engine is more effecient.

 

Thank you sir!







I believe the owner will keep this vehicle off the track as I think he likes street driving the car. I will try to get a video of the car up from the dyno here in a few days as I am about to go out of town to the PRI Show.


thanks guys
Chris Macellaro

 

I have yet to see a LS7 rod, but my guess is that it's not super heavy duty to withstand huge amounts of boost. Titanium is expensive. Surely GM gave the rods just a little more strength than what was needed, but then again, all you need is a few PSI to spin out in the first 3 gears

 

Very cool project. We've done about 7 of the APS C6 kits around florida now so this guy will have some company rollin' around the streets.

 

i'd say the regular C6 is more ideal for boost than the Z07. For sure the engine is cheaper at least if it did blow up

 

i dont think the APS kit holds a candle to this one,

 

This custom kit in question has wastegate dumps...FTL. I don't see any reason to think that the APS kit isn't as good as this custom setup...not to mention cheaper.

 

better parts all around, bigger/better turbos more efficient for this motor, better intercoolers, better components ie tial vs aps, not to mention the aps external setup sucks hind tit. 321 ss equal length headers, vs cast log headers. better craftsmanship, etc, etc. you can hear the pulses in the headers, pure sex. i just remembered that on the c6 kit, aps uses internal wastegates, not the best choice.

wastegate dumps---FTL, hahahaha, have you looked at the aps external setup by chance? coming off the turbine housing at a 90 degree angle, right at the turbine wheel, and put back into the exhaust at a 90 degree angle---FTL! i dont know what APS infactuation with exhaust backpressure is.

why do you say wastegate dumps FTL. its the best option, if youre talking about the sound, uh, believe me, you can barely hear them over the motor. this isnt a honda.

and of course its cheaper, its a one off kit, now that he has jigs, im sure it wouldnt be so much for the next one. he doesnt have 100 duplicates sitting on the shelf.

 

I hate external dumps...simple as that. Loud and annoying.

 

trust me on this car you hardly notice, altho, its only at 6psi, and the motor is way loud already.

the wastegates have the 5.7psi springs, and just sitting in neutral free revving it opens the dumps, pretty impressive making 6psi with zero engine load.

 

The owner of the car agrees with you. He has decided he wants them back in the exhaust. I just figured I'd give him some options. Some like it some don't. I don't care for the noise but it almost always makes more power. On my own personal car I have the wastegate open, but with a tiny suppertrapp on it to quiet down all the racket
The APS kit is really nice and is putting out some great numbers for less money, but this guy wanted a custom set up which always costs more, plus I don't think the APS kit would just "bolt up" to a ZO6 due to the large oil cooler up front and the dry sump plumbing. I would have no quandries with using there kit if a customer wanted it.

 

Would the APS manifolds even bolt up to the LS7? I'd assume the heads are different.

 

thump rrr, as far as excessive rpms with boost in a Z is concerned, I would have to tell you to refer to Alberto on that one. There was a discussion on a thread about how after 6k the amount of stress on the bottom end goes up some 45% or something like that. This is why many Z's with a custom tune and a raised redline were blowing up as apposed to those people using their kits with supplied engine management and utilizing the stock redline. For more information with that though, like I said, Alberto mentioned to us in a thread, and thats what Im going with.

 

i agree the 03-04 cobra motor tops my list of factory motors!
my boy will be pulling his out in the spring with 1000+ rwhp
and once he gets bored with the power he'll be able to do a direct-port 200 shot!

 

thats just to much......i mean wtf can you really do with all that.

but hey who gives flying nut thats gonna fing sick

 

You do realize that this thread is speaking about a twin turbo C6 Z06 right? I know if I had a 1000hp Mustang who I would be looking for! lol!

Also in a time where there are twin turbo GT40's and Vipers, a 900+ hp cars are just not that uncommon!