MustangExhaust.com has just finished dyno testing a 2005 Mustang GT with a Magnaflow cat-back. Please visit our site to see the results of the dyno test. The test car belongs to a member of The Mustang Source named Joe L. who was among the first members of this board to take delivery of a 2005 Mustang!

2005 Mustang GT Magnaflow cat-back dyno test

-Nino

 

Ford hit the 300bhp on the dot. I don't think so. Something doesn't make sense? That's dynoing too low for even the auto baseline?

 

also depends on the kind of dyno they used...
if they used a mustang dyno, the numbers will be lower than if they used a dynojet.

 

I can't recall, but there was an 05 dynoed on a mustang dyno (it was an auto too) and I thing it put up better numbers than that. Anyone have that data?

 

Didn't someone dyno their 5 - speed auto mustang and got like 260 RWHP and like 280 RWTQ? The dyno for this car seems kind of on the low side.

When I read the installation instructions on the ninosport link on the post above, they do mention something about throwing out the artificially high power numbers?, but I have no idea what that means?

 

The full article with pics, sound clip, and dyno sheet has been posted. We were also expecting higher dyno numbers, but that is what it measured on the Dynojet dyno. To be fair the engine has only 700 miles on it so it is not broken in.

2005 Mustang GT dyno test with Magnaflow cat-back

-Nino

 

Yeah but only 240hp? That really does seem low. What were you saying about the automatic downshifting? Do you not just "put the pedal to the medal" on the dyno?

 

300 advertised hp minus 20% drivetrain loss from the auto tranny is 240 rwhp. It is dynoing what Ford advertises.

The tranny kept downshifting a gear when they floored the gas below 4000 rpm so it was not staying in the gear that we needed it to (4th). This made it tough for the tech to dyno the car at wide open throttle and made the low rpm numbers look very low.

-Nino

 

How come you didn't dyno a 5-speed?

 

Joe is the only person in Houston at this time that I know that has an 05 Mustang and it just happened to be an auto.

Not to be a smartass, but the auto transmission is also a 5-speed now.

 

[/QUOTE]Scott noted that running the engine after completely removing the factory mufflers did not produce a much louder exhaust note, which seems to imply that the converters are potentially big restrictions.[QUOTE]

That doesn't sound good...I guess those who want a really loud car have to start lookin at catalytic converters now :bang:

 

I can't recall, but there was an 05 dynoed on a mustang dyno (it was an auto too) and I thing it put up better numbers than that. Anyone have that data? [/b][/quote]
Motortrend November 04 267 rwhp on an auto

 

Joe is the only person in Houston at this time that I know that has an 05 Mustang and it just happened to be an auto.

Not to be a smartass, but the auto transmission is also a 5-speed now. [/b][/quote]
Smartarse. Yah, I know. I think the days of using manual and 5-speed interchangeably are long gone. Gotta get rid of that habit.

You guys should get your hands on a 5-sp.....manual next time.

 

I heard SOMEWHERE (and not, I can't remember were) that the engine computer will not allow full power performance until it has 3200 to 5000 miles on it and is broken in.

I KNOW that has been done with other makes/models before and I would not be surprised it it was done with the 05 either. Does anyone have any info that can confirm/deny this rumor?

I'm not trying to hijack this thread. They mentioned that their test engine only had 700 miles on it...

 

every dyno will show different readings so you can only truely compair stuff on the same dyno same day (for differences in weather)

 

not true at all for any car ever made. They get faster after 3k-5k miles becase the rings are finnaly all set in right and the motor has been broken in as much as it will be

 

Your words
I KNOW cars that have had engine computer blocks that have not allowed full power until
3200-5000 miles. OK show me the proof. No B/S just the truth!

 

Your words
I KNOW cars that have had engine computer blocks that have not allowed full power until
3200-5000 miles. OK show me the proof. No B/S just the truth! [/b][/quote]
My 2003 Hemi Ram 1500 had to be driven 1500 miles(wonder how they came up with that number) before the TRANSMISSION would allow full power to be realized. My truck would shift around 4500rpms at WOT before the 1500 mile mark. Now it shifts hard at 6000rpms+. I was advised of this through the Mopar tech. when I complained that my truck wasn't shifting right. I didn't believe it until I saw it....but don't know how I can prove it

 

Doug Thanks for the facts. I am now a little smarter than before. There are loads of info here that can not be backed up. I will talk to my hemi truck buddy and see if his did the same thing.