bobandc

I have a 2007 Z06 with a CAI, Am. racing 1-7/8 headers, cats and billy boat exhaust. I had the car dyno tuned a little over a year ago here in Denver. (about a mile high so HP loss due to altitude). The top dyno shown is the first dyno result. A few weeks ago I had the heads replaced with ported heads and added a mild cam. The 2nd dyno result shown is post heads/cam changes. Same dyno, same tuner. As you can see the results were virtually the same. Additionally the car drives about the same.

These are not the results I expected. I figured I'd end up with HP/Torque gains but got nothing. The tuner noted that the car was "starved for timing". I'd generally ignore the dyno results but the car drives the same and the dyno seems to agree with my driving experience. Does anyone have any comments on this? Is there a problems and if so, what might it be? Whats my next step to get some results from the cam/heads upgrade?


2017

2019 after heads and cam
w

LOURDESBELLE

Need some info on the heads and cam.

Racingswh

Based on when it makes power it looks like the cam has nearly stock/stock profile characteristics.

Who's cam is it and which one meaning do you have any specifications at all? Who did the heads?

bobandc

American Heritage street ported heads with their 116 cam.

freddyvette

That AFR is at 13? You're leaned out and risking your engine. You need a new tuner. Don't take it back there.

zblackz06

I have a similar set up, same heads/cam,halltech,headers and Corsa and put down 532rwhp.I have heard that that setup is good for about 550 but dynos and cars vary.I would have your tune checked.

Racingswh

If it were mine I would do two things. First I would ask AHP their thoughts. The 116 makes more power than that on the dyno sheets I have seen but AHP may have more information and insight into possibilities of why you are seeing what you are. Second I would have the tune checked and adjusted to a more reasonable AFR.

Good luck to you.

bobandc

I've talked with them, sent them the dyno's and I am waiting to hear back from them. I hope to hear from them next week.

Unreal

How old are the AHP heads? The new CNC ones or the old hand port stuff?

Those numbers are sad to say the least. Add in the 20% correction factor and the car is barely making 370rwhp. If car can't take timing and is making that little power, sounds like a mechanical issue.

Josh B.

The low results would disappoint me as well. Even by AHP standards thats a low result.

bobandc

These were received from AHP early April.

freddyvette

Why don't you stop for a second and take a look at your dyno's AFR. Even your own tuner said it was "starved for timing" which is a dumb way of saying "it should be taking more timing but I don't know what I'm doing wrong."

If you weren't running so lean you would be able to run more advanced spark timing without detonation. I'd be willing to bet your WOT log has knock retard all over the place.

American Heritage

Is the Camshaft installed Correctly (IE Dot to Dot)?
Lash caps installed?
As mentioned above by another poster your tuner has you at 13.0 AFR. No reason to be that lean. I would find another tuner as that may be your issue!

Our 116 Cam with our Ported Heads is a proven combo that puts down anywhere from 525-555rwhp depending on you combo/mods and tuner. We literally have 75-100 of these combos out there most all putting down between the 525-555rwp range!!!

For example here is a dyno graph provided to us by one of our customers from another local shop that did the install and tuning and uses a DynoJet.... He has our Ported Heads with out 116 cam, Cold air Intake, I believe a ported stock TB with Stock Manifolds/cats and BB Mufflers.....535rwhp/483rwtq....



https://www.americanheritageperformance.com/

bobandc

Anyone here know a tuner in Denver area or front range of Colorado that I can contact?

Racingswh

What's interesting to me is that's the way it left the shop in December of 2017. Higher than 13 to 1 for the past year and a half.

Hopefully less air and more timing finds the power that's missing but a mechanical issue as Unreal mentioned wouldn't surprise me.

freddyvette

If you look at the red line, the stock tune / baseline has the AFR dropping from 12.2 to 11.5, which is a little rich, but not dangerously lean. Then the new "tune" leaned it out to almost 13.2 (blue line)

bobandc

The BCM was replaced when I purchased the car used a little over two years ago. Could that be contributing to the problem?

freddyvette

Not likely. The tuner doesnt seem to know some basic parameters of fuel combustion

atomic 505hp

I have those heads on my car and a little bigger cam and only making a little more hp then you. I don't think those heads flow as good as they say. A good tuner will tell you everything you need to know. Good luck, hope its just the tune.

Indepth

They don't. I've spent 2 years chasing why my car was low on power, only to discover the heads port work was so sub par I was choking my entire setup. Stock throats, stock cc'd chambers, etc the list goes on... Have your heads pulled and look at the port work, it might be the root of your problems.