Unreal

It is a mechanical fuel pump driven off a cam lobe, so an electronic voltage boost will not work.

jleews6

I have to say,Im impressed. I thought the blower would be all done by 700 at the most. How high are you spinning it? What are the IATs after one pull?

0NORCAL-SS

What cold air intake are you using? Your own model or another brand? What filter?

on the balancer bolt on deal no rings or anything needed like metco right?

How much do you think the crank balancer will be once released?

Im just trying to get my parts before my car gets here.

PRE-Z06

They are on purposely not adding timing as the fuel pressure is dropping and adding it could cause it to run lean meaning potential damage, of course once it can be done safely it should make more power...hope that helps

Thanks for sharing guys!

JG853

Sean -

I think you will need to have a H/C package and all of the other bolt ons of their Reaper Package to get to 750 RWHP.

It would not be just a pulley, intake, headers, tune deal to get that kind of power. The headers will not do much for the car unless you also change the cam and cnc the heads.

JG853

ChucksZ06

JG...When they are able to add timing back in in should add a lot more hp.

Late Model Racecraft

Once the weather gets better down here(rain and very cold every weekend) we will be taking the LMR Z06 to the track to she what she can do. Hopefully by the end of January we should have some impressive 1/4 miles times for a manual car.

Snorman

LMR...are you planning on doing a H/C package to hit 750 rwhp?
Assuming your fuel system fix involves a cam swap?
S.

Late Model Racecraft

It was in the 30s yesterday evening when running the tests. With that being said, the IATs showed the same results on the dyno as they did when making 10.5lbs of boost on the dyno. Of course we were not able to log street runs due to the fuel issue. We stopped immediately because this is a customer vehicle and made no sense in continuing with any other tests or dyno pulls since we know the fix already.

Late Model Racecraft

Correct, in this case, the High pressure side or mechanical fuel pump is the issue. Now this is not to say once we fix the High Pressure side we will not run into the low pressure side(which is the electrical pump) because we have ran out of both in the past with the regular C7 therefore we sell our own custom Electric fuel system with our C7 packages. Only time will tell whether or not the C7Z will need the same thing and at what HP level.

Unreal

Is there any reason to believe the electric pump is different or higher flowing than the base c7 one? Different part number or anything? I was really expecting more out of the z06 injectors/pump. So it looks like a base c7 runs out of fuel ~580 and the z06 got it another 100hp so if a base person put on z06 injectors/pump they should be good for a solid 650ish.

Great job as always LMR. Keep up the good R&D.

petecaballero

Impressive results. Looking forward to availability and pricing info.

ChucksZ06

I think the fuel supply problem is with the mechanical pump as the electric is there to push fuel to the mechanical pump.

Unreal

I know it is, was just asking if it is the same electric pump out in the back or if the z06 had a higher volume one.

OBSSSD

It is near maxed out because through most of the powerband they gained about 20 rwhp/tq even though they increased boost by 4.5 psi and that is with LT headers on the car. When you consider that is on an engine that is running a 10:1 CR the gains are even less impressive. Adding this much boost on a ZR1 yielded over double the hp gains even on stock manifolds and I know because I tuned several of them with just a smaller upper pulley and air filter replacement. When you start to push a PD blower near its limits you start building large amounts of boost without adding a whole lot of power like here. Torque can usually improve a bit more than hp can when reaching these limits which you see here.

A look through C6 ZR1 threads where people tried to find the limits of the blower will demonstrate what I am talking about. The ZR1 can make over 800rwhp on the stock blower, as where the Z06 will pretty much be done at a lower level than that. When you consider the LS9 is running 9:1 CR and doesn't have direct injection that really shows how much difference the bigger blower makes. The Z06 would make 900rwhp with a 2.3L blower assuming the motor could handle it. There will eventually be a big market for a larger blower that fits the car because it just doesn't have the headroom for the serious modder.

T/A KID

These numbers basically look like Vengeance numbers, and I hate comparing dyno numbers anyways due to some many variables. Look forward to track results!

The blower is MAXED, for those not familiar with boost pressures it INCREASES with cool weather which is what we are seeing here. I would rather see much lower PSI at these power levels any day, by them increasing to these levels with very little power increase is another sign the blower is about done.

LMR I tune cars professionally so I know a lot on this subject.... have you tried adjusting the Start of Injection?? Also I have ran increased pressure past the factory C7 15MPA which is 2176psi to 17-18MPA. Of course factory LT4 is 20MPA but the mechanical pump is a larger unit and has a higher flow capacity, with a little testing may be able to squeeze 25MPA out of it no problem which will give you head room and again adjustment of the start of injection is everything. If injecting too late into the cycle there is NO TIME for fuel to be injected when the intake valve opens at high RPM, which on the scanner looks like your just running out of fuel.

Late Model Racecraft

You are correct and thanks for replying. If we ran the timing the engine wanted, we would be making 75-100hp more if we had the fuel to go with it.

Late Model Racecraft

For the few doubting the HP levels of the LT4 platform just sit back and see what happens over the next couple of months or weeks even with more R&D.

We build and tune the worlds most powerful, quickest, and fastest C7s on the planet. We have been on the cutting edge of tuning technology since day one and will continue to provide our clients with the most powerful and reliable C7 combinations.

http://www.superchevy.com/features/1...d-prototyping/

Snorman

So the claim made by the other "tuners" in this thread that the blower is "maxed" and only making "20 rwhp/tq" more through the powerband will be proven false in the coming weeks?
Great info!
S.

AdPock

Very impressive, too impressive not to make the front page!
https://www.corvetteforum.com/articl...hp-c7-z06-yet/