Project Corvette

[Halon]

A lot of that makes sense, kinda like we were texting about. A setup that flows better wil flow the same amount of air, but with less resistance will end up being a lower pressure (psi).

The whole compression ratio thing, that really seems like such a tiny change that I wouldn't have imagined it would have done anything like dropping a whole psi. Doesn't seem like that much "bigger" of a chamber with lower compression pistons. The cam makes a lot of sense I think, but for some reason I was under the impression that your new supercharger cam was less aggressive than your NA one was. Also makes sense your motor is still new and fresh, might take a little bit to break in / wear in. All just speculation as I'm hardly an expert on any of this by any means, lol.

EIther way, as long as you aren't finding anything 'wrong' then hey that's all great news. Who cares if it makes a PSI less, and a few HP less (hell that could just be a difference in the dyno itself). That's a solid number, on a fairly light weight car. Enjoy that beast!!!

[tehehodi]

Don't forget to put in the ducting by the intake to see if that helps direct air to your radiator cause you said it was running a tad warm.

Could just be LS motors run on the hotter side when not moving much air though?

[A//// Guy]

For sure Brandon, well see if i have any boost leak tests, but that compression ratio change is quite large in drop. Stock is around 10.5:1 I think on a stock 6.2 liter. This engine is a 7 liter.

Don't forget to put in the ducting by the intake to see if that helps direct air to your radiator cause you said it was running a tad warm.

Could just be LS motors run on the hotter side when not moving much air though?

Yea I tried putting that in last night but have to redrill the holes since i braced the radiator better and it moved it a little forward.

Also ordering the lower air dam peices that create vacuum under the engine to pulll hot air out. Previous owner must have scraped them off, they are made to be replaceable and scrape. Im also relocating the license plate as it blocks flow to the intercoooler and radiator. Removed that last night, wish I could just leave it off...

New motor probably runs a tad hotter because more friction, plus this oil is break in oil. But after some researching, 226 is fairly normal on a hot day.

[Halon]

Time to bust out the Dawn water wetter :)

[asshanson]

I removed the lower air dam for Eric when he bought the car, his driveway was stupid steep and would have destroyed it within a month. He probably tossed it. That should help lower temps too (in addition to the upper air shield from ECS).

Regarding the boost, if it makes 4psi right away in lower rpm range, it shouldn't taper at all. Normally centrifugal blowers make more and more boost all the way to redline. The restrictor should reduce the boost creep and keep it flat, but I wouldn't imagine the boost actually drops. Boost leak or belt slipping are the two most likely candidates, or possibly the crank pulley slipping on the crank if they didn't pin it again.

Good luck figuring it out and the speedo thing.

Edit: That's a fatass torque curve. How is driveability at slow speeds on city streets with the SC cam? Surge/buck at all with really low throttle?

[A//// Guy]

I removed the lower air dam for Eric when he bought the car, his driveway was stupid steep and would have destroyed it within a month. He probably tossed it. That should help lower temps too (in addition to the upper air shield from ECS).

Regarding the boost, if it makes 4psi right away in lower rpm range, it shouldn't taper at all. Normally centrifugal blowers make more and more boost all the way to redline. The restrictor should reduce the boost creep and keep it flat, but I wouldn't imagine the boost actually drops. Boost leak or belt slipping are the two most likely candidates, or possibly the crank pulley slipping on the crank if they didn't pin it again.

Good luck figuring it out and the speedo thing.

Edit: That's a fatass torque curve. How is driveability at slow speeds on city streets with the SC cam? Surge/buck at all with really low throttle?

Ordering some water wetter now haha, yea that should help a few degrees.

I talked to Chris at ESC and hes going to look over the dyno graph and see what he thinks might be going on. He did say boost of 4psi seems normal with a bigger motor and lower compression. If the belt was slipping or the crank, I wouldnt think the power graph would be so smooth, it would be jumpy and erratic but power just tapers after 6k.

Drives really nicely even at low rpm. Almost stalled it a couple times but it came right back. Clutch feels great, really grabby but smooth engagement. No bucking either, a little hesitation or something when cruising I noticed around 2k rpm. Motor is super noisy compared to what im used to.. lol parts and pushrods be tappin. Also its super rich under 4k rpm just by looking at the dyno graph.

[Halon]

Maybe that's just the free tune, lol. Maybe next year you could head somewhere to get another tune with a little more attention to detail, and you can be present for it?

[A//// Guy]

Yea once I look everything over and make sure all is well, ill take it to CJtunes and have him get things double checked, possibly on the dyno, he does a lot of street tuning.

[Halon]

If nothing is wrong and it's just how it is, would you think about running a smaller pulley?

[DSM MN]

That's a sexy car, looks so much better than the new ones.