I went to a meet today in the suburbs of Chicago. MM and CRH were both there tuning cars for one day. I originally hadn't planned to have my car dynoed and tuned, but a spot opened up and I did it anyways.

After tuning it with a new accessport which I bought from MM in person:

159hp.
155hp.
152hp.

Manual 06 with 15k miles, bought used. Pull in 4th gear, engine warm, 85 degrees outside, with a fan blowing at the front of the car. Mustang dyno yes, but other N/As were running 175 average.

Needless to say this is very disappointing.

The horsepower curve on the graph heads straight up until about 6400, where it levels off. It climbs steeply again at 6600, peaks at 7300 or so, drops down at 7700, up again at 8000, down until 8500, and than down until redline.

Torque climbs straight up to 6k, drops down until 7200 because of a valve opening, rises to 7800, and than drops steeply off to redline ending at under 70lb-ft.

The AFR starts at 15 or so until 3500 at which point it stays stable between 13.8 and 14.6 to redline.

I'm getting my coils checked and having a comp test done friday.

What else could it be? Even with an AP I'm running 152, I'd hate to see what I was getting without it.

 

coils....plugs....maybe a clogging cat....

 

Cat at 15k miles?

 

you never know.....could be clogging and creating back pressure at high rpms.....but my first guess would be the coils....

 

Would coils account for upwards of 30 horsepower?

 

prob not...if the coils dont change anything go get a compression check

 

YES,

For optimum performance replace plugs, wires and coils every 10K.

 

I had the same problem..i had major power loss..i took it to a dealer and they told me i needed a cat so they replaced it..styll major power loss so they are putting in a new engine under warranty

 

thats pretty shyttty.. needless to say but with that kinda of power loss it looks like a bit of compression loss.
but the wires and spark plugs should be checked out for sure~ it'll cause major hp loss*

good luck on what the problem is and update!

1-

 

Wait.........you had Ray and Jeff both there and you didn't get their input on this low dyno?
Start with plugs, coils, wires. Probably coils.....but if not, then it may be the cat.....or worse.

 

really? Every 10k miles the whole ignition system should be replaced??

 

I did, but right now I'm basically scrambling for a reason not to have to replace my engine.

 

No. They're just reinforcing that certain aspects of it (plugs, coils) can begin to cause issues (reduction in power) in that short of a time.

 

You didn't stick around to get the compression check as was suggested. Yes, you could have a bad cat at 15K miles. I probably had 2 replaced by that time.
It may not be necessary to replace the plugs and coils every 10K miles, but it would be prudent to check them.

 

I wish I could have. There was a crisis back home. How was the cruise?

I figure I can *carefully* check the coils myself. I'm hoping to god that they are bad, they would be a lot less trouble to replace than the cat and certainly the engine.

 

Here is a baseline from my car with 9600 miles on OE plugs and coils. Notice that it falls flat on its face after the third port opening. The second run is with with new coils, plugs, and wires. It pulls all the way to redline. I am now over 200 using the RB Street Flash. I have yet to see someone post a convincing chart from the AP on an NA car.

 

So.... what do you think the AP lacks that the RB flash has?

 

 

Cat will be replaced under the 8yr/80K mile Emissions warrenty.
Your car is an "06" with 15k miles. Everything should be taken care of under warranty.

 

I'm not worried about expense, I'm worried about getting to work a week from tomorrow. I work 8 until 6:30 and if I don't have a car it means getting up at 6 or so to get there on time. Coils could be replaced on the spot, cat would take a while and engine would take a while while, plus the fighting I might have to do to get it.

 

Compression test, anyways your under warranty so bring it in! It doesn't cost you a dime

 

Absolutely. I'll PM him now.

 

I wish it were so, but it might be a while before everything is straight.

 

how about find the bad component and fix it..

did 75k miles on my first set of coils.. the second new and improved not so much..

plugs are kinda predictable.. 25k if you beat the crap out of them.

but has the op ever flooded.. that would answer the cat question???

beers

 

I personally have never flooded but I bought the car used, and I have no idea if the last owner flooded it.

There was nothing on the service report about flooding, but people seem to de-flood their own engines often these days.