Another stoopid question...rod chattering?

835 Views 8 Replies 7 Participants Last post by fishingjts, Jan 28, 2006

zregime

Discussion Starter · Jan 25, 2006

Yeah, I'm a newb to performance car stuff...spank my bottom with a big stick...but here's my latest stoopid question:

I first noticed this at the drag strip last fall, and am now noticing it again when I'm first in line at a certain local stoplight where the speed limit is 55 and I can get on The Dix a little.

When I floor the accelerator quickly, like when the engine's still down around 2-3K RPM and I just ram the pedal to the metal, the engine compartment sounds like the rods are chattering, or just basically not a comforting noise, and I also seem to lose a little pull/forward momentum with the car -- whereas if I give it a slower (not talking 5-10 seconds here, just not punching it) steadier acceleration, I don't hear the noise even when I'm up past 5500 RPM. I have a stick, BTW...

So, like, why is that?

Maybe I need some dyno data to prove or disprove this too, but thought I would ask the local (free) experts first.:eyepoppin

Thanks y'all...

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hogpowr

· #2 · Jan 25, 2006

No rods to clatter, we have overhead cams. I heard some noises when i had my 05 v-6 manual shift. I associated it to clutch, and tranny noises. Any chance that is what ur noise is?

Good Luck:thumbsup

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MachOne

· #3 · Jan 25, 2006

the engine compartment sounds like the rods are chattering

Sounds like you have some predetonation going on. I would get some higher octane or better quality gasoline.

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PTLM4LIFE

· #4 · Jan 25, 2006

I Thought Part Of Fords Push With These Engines Was Great Performance On 87 Octane??

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pcfrisch

· #5 · Jan 25, 2006

PTLM4LIFE said:
I Thought Part Of Fords Push With These Engines Was Great Performance On 87 Octane??

Well it is, but crummy gas is crummy gas.

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Kohaku

· #6 · Jan 27, 2006

Maybe it's a reluctant lifter(s). There's not a lot of oil pressure happening around 2k RPM. Then you stomp it? You're putting a huge load on an engine that's not ready for it. The VVT is also trying to keep up with your right foot(by wire).

At any rate, have your revs up before WOT.

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fishingjts

· #7 · Jan 27, 2006

Kohaku said:
Maybe it's a reluctant lifter(s). There's not a lot of oil pressure happening around 2k RPM. Then you stomp it? You're putting a huge load on an engine that's not ready for it. The VVT is also trying to keep up with your right foot(by wire).

At any rate, have your revs up before WOT.

The V6 doesn't have VVT (AFAIK)...

He does have an C&L and X-Cal2... could be a bad tune... Sure does sound like he's detonating.... Z, try running some higher octane gas and see if that helps... Also if you have a laptop you can try monitoring the spark knock sensor using your X-cal2...

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zregime

Discussion Starter · #8 · Jan 27, 2006

fishingjts said:
The V6 doesn't have VVT (AFAIK)...

He does have an C&L and X-Cal2... could be a bad tune... Sure does sound like he's detonating.... Z, try running some higher octane gas and see if that helps... Also if you have a laptop you can try monitoring the spark knock sensor using your X-cal2...

Hey John, thanks for the response...you are Da Man as always...

Your post brings up a really good point, one that I thought was a "Thou Shalt Not" as far as the XCal goes -- or maybe even beyond the XCal -- which is: If the tune you're running is for 87 Octane (mine is), will you be doing harm by upping to 89 or 93? (I could certainly understand the inverse, not putting 87 in a 93 tune for instance.) And, if you run a couple of 93 tanks on an 87 tune and then find out the "chattering" condition still exists, will there be any negative repercussions if you go back to 87?

My mech guy (who is an XCal authorized dealer, although he still hasn't figured out how to send me the file of the tune!?) said that the HP gains from the 93 tune wouldn't be worth the extra money per tank of gas.

Also, am planning on getting the Snow Performance water/meth Stage 2 MAF next month with my bonus :eyepoppin so maybe will spring for a dyno run then and get all of this figured out...don't have a laptop at this time.:sosad:

Thanks again for any and all info...

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fishingjts

· #9 · Jan 28, 2006

zregime said:
Hey John, thanks for the response...you are Da Man as always...

Your post brings up a really good point, one that I thought was a "Thou Shalt Not" as far as the XCal goes -- or maybe even beyond the XCal -- which is: If the tune you're running is for 87 Octane (mine is), will you be doing harm by upping to 89 or 93? (I could certainly understand the inverse, not putting 87 in a 93 tune for instance.) And, if you run a couple of 93 tanks on an 87 tune and then find out the "chattering" condition still exists, will there be any negative repercussions if you go back to 87?

My mech guy (who is an XCal authorized dealer, although he still hasn't figured out how to send me the file of the tune!?) said that the HP gains from the 93 tune wouldn't be worth the extra money per tank of gas.

Also, am planning on getting the Snow Performance water/meth Stage 2 MAF next month with my bonus :eyepoppin so maybe will spring for a dyno run then and get all of this figured out...don't have a laptop at this time.:sosad:

Thanks again for any and all info...

You may need to have your tune tweeked... either add more fuel or pull a couple of degrees of timing.. I would try to get this straightened out ASAP...

Your tuner is pretty right about the 93... we found on my car that we just can add much timing over the 89 tune without getting denotation even though I was running 93...

You might want to spring for a dyno session (with A/F) sooner rather than later...

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