Howdy hey

Over the weekend, a friend and I decided to run our cars on the dyno. He's running a supercharged E46 328Ci and I have an '07 GT 5spd with a C&L street CAI and Kooks LT headers with a catted X-pipe.

We went to Carb Connection in Kirkland, WA - this is by far the best shop I've ever been to. Alex, the owner, founder, and resident ECU tuning guru (the shop handles everything from Mustangs to Ferrari's to UW's Formula SAE car) is an awesome guy with a huge wealth of knowledge. When we got to the shop, my friend's BMW went on the dyno first. His S/C (a Rotrex centri unit) is supposed to make 8 psi but we only saw 2.3 peak on his first run - after which his car died idling. Upon start up, a huge plume of black smoke filled the garage and the car wouldn't idle. We pulled the plugs and they were caked with fresh carbon - the injectors were running wide open. Turns out the inlet pipe separated from the throttle body under full load so we basically had to reinstall his entire supercharger to reconnect the piping.

Here's the part where Alex is a really cool guy - he gave my friend and I a lift to work on and let us borrow tools (my friend had his tool kit with him as we were doing other things to his car the night before - lucky break). We ended up working past closing time for the shop, but Alex stayed and hung out with us while he worked on his chain saw. We cracked a few beers, bull****ted, worked on cars, and he even showed us a few of his projects. All in all, a badass day.


Now for my run. Once we had my friend settled and working on his car, we strapped the Mustang down and ran it twice. I'm currently running a Brenspeed 91 oct email tune for only the CAI, so I wanted to make sure everything was still safe with the headers. Turns out SCT released an update for their editing software and it is now incompatible with certain engine codes - mine included. But here are the results from the dyno run:



295rwhp with a CAI, LT headers, and an old canned tune is not bad at all. Alex took a look at the AF ratios and deemed the tune safe - saving me time and money.

For any owners in the Pacific Northwest, Carb Connection is a great shop with great people - I would recommend them to anyone in a heart beat.

 

Your MAF Transer Function Table needs to be adjusted from 3500rpm to about 4800rpm and 4800rpm on out to end. Your running pretty lean from 4800 out to end. (not good at wot)

Once that is done you can add timing in at about 2* per pull until torque starts to drop or no gains in hp are realized.

I would verture to say that 300rwhp + could be possible.

I'm pretty critical when it comes to tuning the MAF since it is the key to top performance.

 

I believe he is running a bit lean too but hard to tell from the pic..

 

295 with a CAI & tune with LT's and an X is reasonable and comforting to see, despite the likelihood of breaking 300 with a few tweaks. Nice.

 

They set the ideal for the N/A engine at 13.2, and yes, it does lean out a bit towards the top end, but unless I'm hunting for MAXIMUM PEAK HORSEPOWER YEAH, its safe.

 

Hmmm, I've read comments from other top tuners who stated these engines(N/A) make max power with an A/F in the mid-upper 12's.

 

and the OP's is in the low 13's....so what is correct gents for a N/A stang? (A/F ratio)

 

I have a C&L Racer with 93 VMP tune and offroad x-pipe with mid muffs, no headers. I got dynoed at 295 with 14 A/F and for the second run, 4% fuel was added and i got 303rwhp with 13 A/F. I think I read somwhere that you want the A/F for NA to be in the high 12's to very low 13's. the OP's run does look a bit lean after 4900 rpm's. heres a link to my run compare.

http://www.vmptuning.com/forum/showthread.php?t=915

 

The correct a/f for an n/a stock gt is 12.8 - 13.2

The red dashed line going across the dyno pull is 13.2. Its better to be a little rich (below the red dashed line) than it is to be above it.

 

While the numbers are pretty good, I guess I expected you to be over 300rwhp with the addition of the LT headers...

I wonder how much more HP you'd get if you were running the 93 octane tune?