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Old 04-02-2004, 08:35 AM   #1
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Acceleration hole?

Just a quick question for my fellow SPI owners...

When accelerating under heavy throttle, does your SPI pull, then fade out a bit, and then REALLY get into it again?

I'm just wondering if it's a MAF problem, or something else entirely. Cam? Too lean?

Ideas?

If I had my video camera back from my parents, I'd post a quick clip of what it does.

Thanks for your time!


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Old 04-02-2004, 12:27 PM   #2
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I usually mash [full throttle] around after 35mph. The car pulls for a bit [short distance] then changes gear and dies down. I think this isnt necessarily a MAF problem, its just changing gears I guess.
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Old 04-02-2004, 12:58 PM   #3
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No no no... you've got me wrong...

From a dead stop, I give it 2/3rds or more. It accelerates well-enough, seems to back off some (which to me indicates cam, I suppose), and then picks back up and accelerates like mad. Pulls to 60ish KM/H (1-2 shift point), and then pulls for the remainder. It appears to have a nasty hole in the powerband around 3500 if my ears are correct.

Under light to medium throttle, it pulls cleanly through that range without drama.

If I'm in 2nd @ 40 KM/H... and I give it almost WOT... same symptoms... pulls to about 55, bogs, then @ 70 it starts pulling like crazy.

Cam grind? MAF and ECU discrepancies? Any other ideas?
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Old 04-02-2004, 05:01 PM   #4
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Hehe You got a STICK, I got an Auto. Totally different HEHE
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Old 04-02-2004, 06:41 PM   #5
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i dont have the answer for you.... but it does not sound to good. you might want to get it checked out.

i do not have this problem with my MTX 03 lx.
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Old 04-02-2004, 06:46 PM   #6
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Come on, don't you guys know anything!!!...
Its your injector timing, lengthen the pulse another millisecond and tune your NOS timing and you will run nines!
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Old 04-02-2004, 07:03 PM   #7
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I saw a similar post a while back.. dont remember all the details but the end result was a serpentine belt that was slipping and causing some serging. Might want to search some of the older threads and see if your problem is similar.
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Old 04-03-2004, 07:27 PM   #8
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Dude, i almost had you. Almost had me, you never had me, you never had your car. I have an auto and ever since i installed my steeda intake, it has incredible pull and i haven't noticed a hole in acceleration in mine, but first gear is extremely slow and second-on is pretty darn quick in my SOHC. Don't know what to tell you.............................................................
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Old 04-04-2004, 06:20 PM   #9
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I'm going to check the serpentine belt... might just be that very thing.
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Old 04-06-2004, 10:54 AM   #10
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It's not the belt. The belt is BRAND NEW, no slippage or excess play at all. Within specs.

Damn... is it like this by design? I mean it runs fine regardless, it's just feels like it's "coming on-cam", sorta.

Anyone else get this?

*sighs* it's probably meant to run like this, and I'm paranoid.
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