BooSSted

I've read a few pages on the changes / upgrades to the ZR1 over the Z06. Im curious to if anyone has further information on a few items which may be beneficial to us Z06 owners.
First being the move to port injection, GM seems to skip the Band-Aids given to us in terms of fueling solutions and went with a port set up. Tuning wise will this benefit Z06 owners in terms of a factory ECM being able to do both components, currently members are forced to have a piggyback fuel controller correct?

Secondly I'm curious to the need to replace the crankshaft in the LT4 as I haven't seen any failures beyond 1000+hp. What benefits could this have yielded on the LT5?

Anything else change that could effect or improve things for the Z06? I've only skimmed through the papers as I'm not interested in the ZR1. Thanks

T/A KID

The GM throttle body will help a ton (its 95mm) and should be able to port and I’m sure it’s fairly cheap..

we will have to see to see how the computer works... may be backward compatible

mirage2991

Design engineers use safety factors for everything. They moved to a forged crank could be just that: they use X% of safety factor, and to keep that same number X at 750hp they needed a forged crank. That doesn't mean the LT4 crank is bad or can't hold 1000k, it can, but not at that X safety factor.

fruitsalad

The LT5 crank has a larger keyway to support the additional load from the bigger blower, in addition to any preemptive strength changes that might have been implemented.

BooSSted

I'm very interested in the computer and fueling options! I hope this poses as a viable option to some of these aftermarket solutions.

dmaxx3500

its direct inj and port inj

I brake for nothing

Isnt the port injection that everyone is adding to DI engines just to keep the valves clean ?

BooSSted

Now they're adding it because of the demand in fuel and small timing window allowed through DI. Increasing the injectors, cam, HPFP gets very expensive and still has a relatively low ceiling. Port injection is the optimal fix, funny GM didn't choose any of the other routes and went directly with port.

RJ-92

Because it works, and it's cost effective.

BooSSted

No **** .. But this wasn't the route aftermarket went. It went to highly priced 10% increased flowing injectors and 30% cam lobe increases.

RJ-92

One would have thought the aftermarket could have just as easily added port injection also. I guess there was a higher profit margin in new DI injectors, cam and pump.

mirage2991

yes to an extent it should help, all depends when and how often the port injection is fired. If it is for WOT mostly, then this will bring a a whole new meaning to "Italian tuning" LOL...

Foosh

Yep, port's there primarily for when extra fuel is need for that amount of power at WOT. To keep the fuel economy numbers reasonable, DI will be primary for normal street driving.

Fortunately, there is no evidence yet, that valve coking causes any performance problems on the LT1/4 engine design.