Cars Dyno'd at Summit

#21

Interesting…

Thanks for posting this.

Carter

#22

Carter wrote:

[quote]Interesting…

Thanks for posting this.

Carter[/quote]

Even more interesting: with the Turner/Conforti chip I made 2 fewer HP (157 vs. 159)!! Uh, is it too late to eat my own "why can’t we use chips" posts? Also interesting is that my AFM was significantly higher at high rpm’s with the Conforti chip vs. the stock chip (~14.6 vs ~ 13.6). Anyone have thoughts on this?

I was honestly shocked when I got the dyno results. I bought the car last fall, and have no reason to think that it was anything but stock. The only mods that I’ve done would be a cone intake, removed the cat, and put on a Magnaflow muffler. I think I need to get a second opinion at another dyno!

#23

Steve:

I appreciate your honesty. I bought a Dinan chip for my eta and lost two hp, while the literature claimed a 21 hp increase.

Just speculating…I’m thinking that the chip helps when the engine is flowing alot more air, from extensive mods, and the fuel and/or ignition timing are holding the engine back. With a stock engine, airflow is the real restriction so a chip doesn’t do much, if anything. I guess that’s how they can make the claims.

I also chuckle when someone says something like, "I put a chip in (a stock engine) my E30 and it feels so much faster."

I went to a recent LS1 GTO tuner day and some of the guys were paying $350.00 for a custom tune. They were getting something like 7 hp at the end, up from about 300 hp stock at the rear wheels. I left mine stock because I don’t think I’ll ever notice 7 more hp.

Carter

#24

I think you’re right, Carter, regarding situations where a chip might help. I’d also be curious to try out an adjustable fuel pressure regulator to see if raising the pressure to lower the air/fuel ratio might result in an improvement with the aftermarket chip. Pure specuation, of course…

I’ve heard from a couple of people out here that the dyno shop I went to tends to give rather optimistic results. I’ll try to get that second opinion I mentioned in an earlier post & see what it comes in at.

#25

My BS analysis of chips:

-As long as your torque doesn’t take a nose-dive as you wind the engine out, if you can spin faster, you generate more HP. If chips up the rev limiter to spin faster, you have more HP.

-I just don’t believe any claims about torque increases. I believe the torque is basically constrained by your compression ratio and the length of the piston connecting arm. The chip doesn’t change the engine geometry, so it cannot change torque.

But, I’m an architect…what do I know. :huh:

#26

Steve:

Keep us up-to-date on your engine and dyno experiences.

I’m hoping you guys can dyno cars at the track, one after the other.

Carter