Very low dyno, with tune and AP
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....
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Originally Posted by chancejat
(Post 2499960)
coils....plugs....maybe a clogging cat....
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you never know.....could be clogging and creating back pressure at high rpms.....but my first guess would be the coils....
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Would coils account for upwards of 30 horsepower?
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prob not...if the coils dont change anything go get a compression check
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Originally Posted by Falken
(Post 2499968)
Would coils account for upwards of 30 horsepower?
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:)
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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? :scratchhe
Start with plugs, coils, wires. Probably coils.....but if not, then it may be the cat.....or worse. |
Originally Posted by kennyfrc1
(Post 2500003)
YES,
For optimum performance replace plugs, wires and coils every 10K. |
Originally Posted by Mazurfer
(Post 2500131)
Wait.........you had Ray and Jeff both there and you didn't get their input on this low dyno? :scratchhe
Start with plugs, coils, wires. Probably coils.....but if not, then it may be the cat.....or worse. |
Originally Posted by RufusVonStorm
(Post 2500241)
really? Every 10k miles the whole ignition system should be replaced??
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Originally Posted by Falken
(Post 2500252)
I did, but right now I'm basically scrambling for a reason not to have to replace my engine.
It may not be necessary to replace the plugs and coils every 10K miles, but it would be prudent to check them. |
Originally Posted by alnielsen
(Post 2500296)
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 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. |
2 Attachment(s)
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. :squint:
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Originally Posted by kennyfrc1
(Post 2500320)
I have yet to see someone post a convincing chart from the AP. :squint:
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Originally Posted by kennyfrc1
(Post 2500320)
I have yet to see someone post a convincing chart from the AP. :squint:
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Originally Posted by Falken
(Post 2500309)
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. Your car is an "06" with 15k miles. Everything should be taken care of under warranty. |
Originally Posted by alnielsen
(Post 2500349)
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. |
Compression test, anyways your under warranty so bring it in! It doesn't cost you a dime
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Originally Posted by Charles R. Hill
(Post 2500586)
Your numbers might increase a bit if you remember to pay tdiddy for your dyno time.
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Originally Posted by Charles R. Hill
(Post 2500753)
BTW, I forgot to put a ;) after my last statement. I hope your family emergency all worked out well also.
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Originally Posted by kennyfrc1
(Post 2500003)
YES,
For optimum performance replace plugs, wires and coils every 10K. 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 :beer: |
Originally Posted by swoope
(Post 2500860)
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 :beer: There was nothing on the service report about flooding, but people seem to de-flood their own engines often these days. |
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