I just got back from this mornings dyno runs. I took the GT for a baseling run before I start modifying it and ran the Mach1 to see how it was running. I hadn't dyno'd the mach since Sep last year.

For the GT w/ K&N filter:

222 rwhp / 222 rwtq

I was really happy with those numbers. I was expecting it to be a little less, around 210-215 range since its an automatic.

For the Mach1 w/ SLP shorty headers, magnaflow catted x-pipe and CB, and C&L CAI:

302 rwhp / 322 rwtq

I've got mixed feelings about the Mach1 runs. The first run was done without the Diablopredator and I was really happy with the numbers, the bad part was that it ran way too lean. The A/F was like 13.8 - 14.3, which I kind expected it to do, but not that high. We did 3 more runs with the Diablo and just kept dumping fuel into it, finally got the A/F curve down to 12.5 - 13.4 ish range, but its not a nice flat even tracing. It looked like a Fn rollercoaster. Next week I'm going to go back to the shop and rent the Dyno room and bang on the mach for a while and tweak it a bit better. I'm also going to switch to Bassani Mid-length headers, x-pipe and CB and put the Magnaflow x and cb on the GT (I'm kicking myself for going with Shorty headers).

Final numbers on the Mach1 w/ diablo:

300 rwhp / 320 rwtq (after 4 runs with around 10 mins inbetween pulls).

I'll probably get a wideband 02 sensor for the mach as well, for peace of mind. The shop emailed me the Dyno sheets, but not in a format that I can use or open. So, hopefully he'll send them to me again soon in a format that I can use.

 

Nice numbers! I had the same issue with the Predator and ditched it and got a custom tune loaded into my ECU...When they first loaded it to my car it went way lean and once they got the A/F fixed the predator wasn't allowing my car to produce any power after 5,800rpms...the power was dropping off a cliff.

How is the low end power in your car? Mine does not exist before 3,500rpms. I guess that's a common problem when adding catback and mid pipe, but I'm getting ready to install Pauls High Performance Intake Spacer to maybe get a little low end torque back....LOTS of people on the registry have done this mod and say it may only give you 4 rwhp & rwtq peak numbers, but it will give you added power throughout the RPM range.

You will for see some gains from the mid-length headers vs shorty's....that will be bad azz.

 

Damn, those numbers sound soooo horrible to me from a GT. I remember back in the day when i had no power... lol. Good numbers for tha mach though

 

screw the mid lengths..if ur gonna go under ur car...do it right the first time and get long tube headers....trust me...ive heard people regret not getting longtubes...im regreting my xpipe..cause the header im geting isnt gonna allow me to use my mid pipe...

 

How is the low end power in your car? Mine does not exist before 3,500rpms. I guess that's a common problem when adding catback and mid pipe, but I'm getting ready to install Pauls High Performance Intake Spacer to maybe get a little low end torque back....LOTS of people on the registry have done this mod and say it may only give you 4 rwhp & rwtq peak numbers, but it will give you added power throughout the RPM range.

Actually, I'm not sure atm on the low end power band. When we were making the dyno runs, I was focused on peak power/torque and A/F ratio. The A/F was so bad that the runs we made after the initial were to bring it down to a safer driving range. Unfortunately, the dyno shop emailed me the results in a format I couldn't use/read, so now I have to go back tomorrow and get them to print out the sheets. I was wanting to study and post the results lastnight, just wasn't able to. I'll have to check into the intake spacer, I don't doubt it'll be a huge help.

Joe