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Old 03-09-2013, 06:46 PM   #1
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67mm CFM TB, Not what I expected?

So I replaced my TB today with the CFM one, and while yes, the throttle seems heavier without slop and the power seems more "linear" if that makes sense, it seems to have killed some of the spunk that I loved so much from my ST. It's louder, it sounds like it has grunt, and as long as I stay a gear lower than normal and keep it in the 4-6k range it has cahones, but the low-end and being able to roast the tires seems to have left. My wife drove it this evening and came back and said it wasn't fun to drive anymore, that it "drives just like any other car now". Is this just a matter of the ECU needing more time to learn or is what I bought really just a heavier spring with a little extra midrange grunt? Anyone with the CFM care to cime in? I have it taking air through a K&N FIPK if that makes any difference.


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Old 03-09-2013, 06:49 PM   #2
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That sucks dude , thanks for putting that up though , i was going to buy one myself

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Old 03-09-2013, 07:17 PM   #3
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That's interesting. Gasket and tps installed correctly, no vacuum leaks? Did you check to see if the butterfly over rotates? When I put mine on it was an instant improvement. I would contact William at cfm.
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Old 03-24-2013, 02:55 PM   #4
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That's interesting. Gasket and tps installed correctly, no vacuum leaks? Did you check to see if the butterfly over rotates? When I put mine on it was an instant improvement. I would contact William at cfm.
I couldnt agree more. Contact William at CFM. I have the same throttle body on my motor. Even though the motor is completely built i have a little bit of lag in the lower range. Its almost like the ecu cannot add enough fuel in time to keep up with the increased air intake and responsiveness. Another thing I can suggest is getting the ECU tuned to make up for the difference. I have not yet tuned my car yet but I know when I do it will be night and day. Good luck man.
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Old 03-09-2013, 07:38 PM   #5
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Gasket was new and TPS was already on it when I got it. I can try my old TPS and see if it makes a difference. Idle is fine and there are no dead spots in acceleration to make me suspect vacuum issues. Install was pretty straightforward with no issues. Cruise works fine. Will take off and change TPS tomorrow.

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Old 03-09-2013, 07:48 PM   #6
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Thats what I have on mine and it has a lot of pickup for me , did you unhook your battery and then take it out for a drive so it can relearn everything? I wouldn't put my stock tb back on if anyone would pay me too .
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Old 03-09-2013, 07:51 PM   #7
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When I had cfm's tb on, I noticed it was great for the on ramps & thats it. DDing bumper to bumper traffic was no good. It was just to touchy. I didn't check the geomtry or the spring stiffness. I should have messed w/ it more, but I sold it right then & there. My wife said, what the hell is wrong w/ the Foci. That was a few yrs ago.
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Old 03-09-2013, 07:56 PM   #8
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^^I have to agree with this as well. I wasn't too fond on the touchy-ness either. Mind you, mine was on a Zetec, but when I was forced to get an OEM tb due to the tps not being available separately, I actually liked the response from the OEM better.

Sucks to hear though, never fun to find out it wasn't what you thought. Hopefully it either gets better somehow, or you're able to figure something else out.
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Old 03-09-2013, 07:57 PM   #9
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@felix, try a fx300 clutch and lwfw in rush hour, not fun. Hopefully the tb issue gets resolved and sheds some light on this issue. Wonder if the tps that came with was on for a long time without being used.
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Old 03-10-2013, 02:53 PM   #10
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@felix, try a fx300 clutch and lwfw in rush hour, not fun. Hopefully the tb issue gets resolved and sheds some light on this issue. Wonder if the tps that came with was on for a long time without being used.
No thanx, I've had plenty of cammed up v/8 cars in bumper to bumper traffic.
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