LT5 engine upgrade question

[Fully Vetted]

I put 430 down to the wheels before I put on the Corsa. I haven't redynoed but if I lost 12hp I'm ok with that. I was damn near deaf on my first trip to BG with my old exhaust and I couldn't even use the radio because of the drone. Everything is peachy with my Corsa and I can still keep up with most things on the road so it works. For me, anyway.

[Paul Workman]

Originally Posted by 1995BLACKZR1

Lol. Yeah the car is legit. It's got what looks like an LT5 engine, engine valet key, ride control switch and the tail is wider than the standard C4. Obviously more horsepower and rumble than my standard 95. Maybe the exhaust place told him that.

I had the Borla cat-back on my otherwise stock 90 ZR-1. Comparing my dyno results to other stock LT5s, I'd have to contest that HP claim, on that (dyno) basis alone.

I didn't loose any performance vs. stock numbers compared to results others have posted. But, I sure as hell didn't gain any 50-60 hp performance boost as result of the Borla!

[SAM/CH ZR-1]

Originally Posted by Pete

Here's food for thought c6 ZO6 (430-450rwhp),C6 ZR1 (530-550rwhp) they come with 3" exhaust. If GM can make the same power with 2" or 2 1/2" why would they spend extra money on 3" and save some weight.

Enjoy
Pete

Because the C6 Z06 has a 427 displacement and the C6 ZR1 a compressor. That requires a bigger exhaust system.

I did the experience that 350 cui engines loose some low end torque with headers and a open 3 Inch exhausts.

Sam

[Bob Eyres]

Originally Posted by Paul Workman

I had the Borla cat-back on my otherwise stock 90 ZR-1. Comparing my dyno results to other stock LT5s, I'd have to contest that HP claim, on that (dyno) basis alone.

I didn't loose any performance vs. stock numbers compared to results others have posted. But, I sure as hell didn't gain any 50-60 hp performance boost as result of the Borla!

Borla, although one of the sweetest sounding aftermarket exhausts for the LT5, is one of the worst if you're looking for performance improvement.
I installed the Borla "so called" 2 3/4" system in 1995. Sounded great, but no real improvement.
It wasn't until I went with the B&B, with headers and no cats that the car really woke up.


Light, single mass flywheel, and 3" inch exhaust. They sure do help the stock LT5,.....but the Fing PAIN..

[XfireZ51]

Originally Posted by SAM/CH ZR-1

Because the C6 Z06 has a 427 displacement and the C6 ZR1 a compressor. That requires a bigger exhaust system.

I did the experience that 350 cui engines loose some low end torque with headers and a open 3 Inch exhausts.

Sam

Sam,

Did you update the tune to optimize for the difference in backpressure?