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Discussion Starter · #1 ·
I just installed the F2 intake the other day. Despite the recommendation in the instructions not to reset the ECU (deemed unecessary by SCI), I did after the install.

The car pulls great, but without a quick blip of the throttle from a start there is considerable lag. There is also a noticable lag if I wind out 1st to 6K RPM or higher and shift to second. Reve matching helps on downshifts, but there is still some lag.

I guess my question is for the F2, is this normal behavior? I didn't have this type of response (or lack there of) from my AEM CAI. I am hoping that the ECU is still in a way learning things even though I have logged close to 70 miles over the course of several driving cycles... Thoughts?
 

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The F2 has a larger diameter which means you might lose some low end torque.

But I don't know if that explains the lag.

I'd re-tighten and check coupling connections at the throttle body because those can loosen up. Then I would have used MAF cleaner on the mass air flow sensor when installing the new intake.

Every time I reset the ECU it feels a little tame, but I don't think it should after 70 miles.
 

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Discussion Starter · #3 ·
My first impulse was that something was loose. I have checked all of the couplings and they are quite snug. When removing the MAF sensor from my AEM it looked pretty clean, so I am not sure if it is that or not. If the lag is inherent of this intake, I may go back to the AEM since in autocross, the last thing I want is a loss of my low end grunt.
 

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i was in on the first g.b. on this intake almost a year ago now and everyone experienced the loss in low end...i learned over time to keep the rpm's above 3000 for the best results.
 

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Discussion Starter · #5 ·
[quote author=hutch3535 link=topic=73859.msg1312753#msg1312753 date=1175731106]
i was in on the first g.b. on this intake almost a year ago now and everyone experienced the loss in low end...i learned over time to keep the rpm's above 3000 for the best results.
[/quote]

That is fine for launching but what about the lag from 1-2? I mean I am shifting at 6k or higher RPMs. "Normal" shifiting in the 4.5-5k range seems fine. Shifting from 2-3 at 6k+ is fine as well, it is really just that 1-2 shift that irks me...
 

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Discussion Starter · #7 ·
[quote author=MZ3FRS link=topic=73859.msg1312763#msg1312763 date=1175731402]
*Hoping this isn't typical*
[/quote]

Yeah it will be interesting to see if others have a similar issue or not. I still think that the ECU is in learn mode. I haven't even had 10 driving cycles yet.
 

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You're also probably experiencing the lack of throttle response your AEM CAI had. If Rubyred3 catches this thread he probably has more input on this. He never had the F2 (IIRC) but I think he had a short ram and the AEM. short ram > AEM > stock in terms of throttle response.

+1 on the low end torque. Bean did a dyno comparison and there was a definite difference in low end torque.
 

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[quote author=ag bullet link=topic=73859.msg1312770#msg1312770 date=1175731512]
[quote author=MZ3FRS link=topic=73859.msg1312763#msg1312763 date=1175731402]
*Hoping this isn't typical*
[/quote]

Yeah it will be interesting to see if others have a similar issue or not. I still think that the ECU is in learn mode. I haven't even had 10 driving cycles yet.
[/quote]

Sounds likely. I would expect some loss of low-end but your use of the word 'lag' frightens me haha
 

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[quote author=MZ3FRS link=topic=73859.msg1312763#msg1312763 date=1175731402]
*Hoping this isn't typical*
[/quote]

sorry but it is...really has nothing to do with reseting the puter or not...i've got about 16,000 miles on this intake now and what you loss on the low end makes up for it on the mid and top end...guess it just depends on where you need the extra muscle...i dont stay in 1st or 2nd very long.
 

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sorry guess i misunderstood you, no i dont experience any lag if i am on it to that extreme
 

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[quote author=ag bullet link=topic=73859.msg1312814#msg1312814 date=1175732527]
hutch, let's say you wind 1st out to about the redline and shift to 2nd. Is there a lag or a bog of power?
[/quote]
a very little one.
even with the stocker there was one.
but i dont think i have it.
 

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Discussion Starter · #14 ·
[quote author=hutch3535 link=topic=73859.msg1312834#msg1312834 date=1175732978]
sorry guess i misunderstood you, no i dont experience any lag if i am on it to that extreme
[/quote]

Ok so that is giving me hope that something else is going on and that it will maybe work itself out.
 

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[quote author=eurotuner link=topic=73859.msg1312892#msg1312892 date=1175734278]
ps: why do u shift only at 6k?
[/quote]

[quote author=ag bullet link=topic=73859.msg1312757#msg1312757 date=1175731289]
I mean I am shifting at 6k or higher RPMs. "Normal" shifiting in the 4.5-5k range seems fine..
[/quote]


Read...
 

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I had the F2, and from my experience, the car would stumble a bit if you do a quick on-off-on throttle, as in a quick shift. I had the best results with that high rpm 1-2 shift, if I'd lay off the gas for a hair longer than normal and let the revs fall just a bit, instead of clutching out right away.

I kind of thought maybe it had something to do with how the airflow through the MAFS section of the tubing would be disrupted as the throttle plate closes suddenly.... but who knows.
 

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[quote author=boardumb link=topic=73859.msg1312924#msg1312924 date=1175734718]
[quote author=eurotuner link=topic=73859.msg1312892#msg1312892 date=1175734278]
ps: why do u shift only at 6k?
[/quote]

[quote author=ag bullet link=topic=73859.msg1312757#msg1312757 date=1175731289]
I mean I am shifting at 6k or higher RPMs. "Normal" shifiting in the 4.5-5k range seems fine..
[/quote]


Read...
[/quote]
if u shift that high, u are racing? so that s why i asked.

DD shifting for me is 3500/3300/3900 but our taco is so innacurate.
 
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