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Originally Posted by Blackdevil77

Is the cam different in the LT5?

Negative

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Originally Posted by toohighpsi

The LT4 package was designed to meet the European pedestrian impact requirements in the Z06 which necessitated the smaller rotor diameter TVS1740 to maintain acceptable hood clearance. GM does not go to the dyno to see how much power they can get out of an application, that is determined by the vehicle design team and powertrain simply meets the requirement. There are no kudos for extra power, if the engine makes more than expected they will pulley/calibrate it down to the spec.

The 1740 on the LT4 is already tuning the maximum speed allowed by Eaton/GM. While it is possible to spin it a bit harder and make some additional power in the aftermarket, it's already at the end of it's compressor efficiency. This is what necessitated going to the larger SC. In the case of the LT5 the TVS 2300 would have been enough to easily hit the target that they delivered, but they clearly wanted to have a car (ZR1) that makes a statement and will continue to. The TVS 2650 is a serious piece and you can bet in no time there are going to be some crazy fast tuned ZR1s out there!

This is the most accurate and best post I have seen on this form!!

[EDFHOBBIES]

Originally Posted by Stealth7

My ZL1 is new, stock and may or may not stay completely stock. Great car!

Just food for thought and "ease of emissions-friendly mods", especially in CA:

1. ZL1 has 650hp/650trq crank power OEM.

2. ZR1 has 755hp/715trq crank power OEM (so, 105hp and 65trq).

3. Among other changes, the ZR1 adds a larger Supercharger, Larger Intercooling Capacity and More Sophisticated and Additional Fueling for the gains in #2. May also be Intake and CAM changes, not sure.

It is a bit interesting that GM made all of those changes to get those gains, but ZL1 owners and tuners are simply swapping pulleys and tuning for such gains. Makes me wonder about drivability, longevity, safety margins (too lean, etc.), warranty and other matters. If minor mods could have safely increased the power of the ZL1, it seems that GM would have done so.

Thoughts?

The 200lbs or so lighter vette is nice..

They dropped the ball on the 2650 LT5 blower it has 2 small intercoolers.. hopefully it makes up on flow.. Take a look at the redline eforce blower they got one of the 1st 2650s its a huge brick just like the maggi.


watch the stock zr1 hang w a modded Hurracan one of my favorite videos



a video of LT4 vs the 2650

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Lt5 2650 vs edelbrock

[FringBirdAloha]

Originally Posted by Blackdevil77

Is the cam different in the LT5?

Yes it’s different. Not the same as an LT4.