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Discussion Starter · #1 ·
Hey everyone,

My fiesta st just doesn't feel the same as it used to. The whole "Mad shove into your seat" thing has sorta faded. I have another way of testing the performance of my car and it has sorta lost that as well :/

I had an Autospecialists kit on my car which had a K&N filter and I am worried that it may have caused problems with the MAF possibly??

Any other ideas guys on what could be causing this slight performance loss?

Thanks, Jack
 

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If your in the states, your MAF literally doesnt do anything lol.
You probably have just gotten used to the car. My 437whp speed6 felt slower after I drove it for awhile.



 
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Ahh ya you guys do have MAF tuning I believe.
I doubt a drop in filter messed up your fuel trims. See if your MAF is dirty. Buy some maf cleaner and see if that fixes it (assuming it is dirty)
My money is still on that your just getting used to it.



 

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Discussion Starter · #5 ·
Yeahh im thinking that as well now tbf :/ I think maybe some maf cleaner may be a good cheap buy. And also I heard someone say that his boost pipes weren't exactly tightened up great so that may be worth looking into possibly.
 

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Yep boost leaks are always a possibility, and one that would for sure rob you of power. Check all your vacuum lines too.



 
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Discussion Starter · #9 ·
Just checked boost pipes. I could tighten 4 of the 6 joints i found using a socket and 2 fingers. They were very loose tbf. Sprcially the ones right on the turbo outlet and just after the metal pipe from the turbo outlet.
 

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Just checked boost pipes. I could tighten 4 of the 6 joints i found using a socket and 2 fingers. They were very loose tbf. Sprcially the ones right on the turbo outlet and just after the metal pipe from the turbo outlet.
That's disconcerting. Are they basic worm gear clamps? How many miles on your car? Those would be error-proofed from the factory so they must be working their way loose due to heat cycles and vibration.
My opinion - replace them. If they did it once they'll most likely do it again.
 

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Discussion Starter · #12 ·
It seems weird but yeah I can only think they have gotten a bit looser since it left the factory. I have heard someone else mention his intercooler pipes were a bit loose as well (Couldn't get to them on mine today so will be doing that soon as well) but yeah it has 4600 miles on it now.
 

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Glad you got it figured out dude



 

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this is nuts. the lack of QC on these is unbelievable.
This wouldn't be a QC issue as those fasteners would be electronically error proofed at the assembly plant. And the vehicles obviously cleared pre-start/rolls/squeak and rattle without a charge pipe leak.
I'm concerned it may turn out to be an issue with the clamps they spec'd. Potential for TSB if it becomes wide-spread. Fortunately a relatively easy fix.
 

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Just checked boost pipes. I could tighten 4 of the 6 joints i found using a socket and 2 fingers. They were very loose tbf. Sprcially the ones right on the turbo outlet and just after the metal pipe from the turbo outlet.
This has happened to me! the boost pipe blew off of the turbo outlet while I was haulin ass on the freeway.


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This has happened to me! the boost pipe blew off of the turbo outlet while I was haulin ass on the freeway.


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The first time this happened to me with my SRT4, I about soiled myself. I thought I blew my engine for sure haha.
Loud bang, loss of power, no knowledge of cars at the time = scary



 
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