LML Twins and Opinions

FROGMAN524 · Sep 9, 2019

So without raising my idle to fix the slight vibration I’ve been having I have a question about a different way to go.

When I’m driving in town and let off the throttle under about 55MPH and coast, like coasting to a stop light, the RPMs drop and stay at about 750 until I’m at a complete stop and then they drop to 640 which is normal idle speed. Is there a way to make them drop to 640 while coasting? 750 is the vibration sweet spot so it’s quite annoying.

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Chevy1925 · Sep 9, 2019

There might be but im doubtful.

N2BRK · Sep 9, 2019

there is on the LMM, so it seems reasonable that there might be.

FROGMAN524 · Sep 9, 2019

I’m sure it’s a tuning thing if it can be done. Is there a reason the LML does this?

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JoshH · Sep 9, 2019

I haven't found anything to prevent them from randomly doing an 800-850 RPM high idle sometimes. I doubt there is anything in EFILive to do what you want, but I'm sure there is something in there if someone had the time and patience to dig through the hex code to find it. That is something way outside my payscale though.

FROGMAN524 · Sep 9, 2019

Unless you’re at a complete stop it stays at 750 or so when coasting with the converter unlocked.

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PureHybrid · Sep 9, 2019

I'm sure it will never truly get back down to idle speed, the driveline will push the engine a little unless the converter is really loose.

kidturbo · Sep 10, 2019

Haven't looked in an LML file for a bit, but as stated above, the LMM has a table where idle speed can be adjusted based off VSS reading zero or not. Sounds like that's the one ya need to change.

Other option, a push button momentary open switch stuck in the output shaft speed sensor signal wire on trans would accomplish the same. It's PWM so, no pulses, it thinks your stopped... I'd check option 1 first.. :thumb:

FROGMAN524 · Sep 10, 2019

kidturbo said:
Haven't looked in an LML file for a bit, but as stated above, the LMM has a table where idle speed can be adjusted based off VSS reading zero or not. Sounds like that's the one ya need to change.

Other option, a push button momentary open switch stuck in the output shaft speed sensor signal wire on trans would accomplish the same. It's PWM so, no pulses, it thinks your stopped... I'd check option 1 first.. :thumb:

Thanks I’ll ask Blake about it

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S Phinney · Sep 14, 2019

You have compounds in it right? If so the vibration is probably coming from the atmosphere bracket. There is some harmonics in some people systems. Do you have a bracket bolting it to the accessories cover?

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FROGMAN524 · Sep 16, 2019

Yes the 490 is bolted to the side of the block and that’s probably causing the harmonics. Not sure how to solve it besides changing idle to 800+

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Bdsankey · Sep 16, 2019

FROGMAN524 said:
Yes the 490 is bolted to the side of the block and that’s probably causing the harmonics. Not sure how to solve it besides changing idle to 800+

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Is changing the idle a no-go? It will likely fix your problem.

S Phinney · Sep 17, 2019

FROGMAN524 said:
Yes the 490 is bolted to the side of the block and that’s probably causing the harmonics. Not sure how to solve it besides changing idle to 800+

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Does the arm that’s holds the atmosphere have a bracket up top that bolts to the accessories cover? If not you can make one fairly easy and that will stop the harmonica you are experiencing.

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NC-smokinlmm · Sep 17, 2019

Take it to the track already...

FROGMAN524 · Sep 18, 2019

S Phinney said:
Does the arm that’s holds the atmosphere have a bracket up top that bolts to the accessories cover? If not you can make one fairly easy and that will stop the harmonica you are experiencing.

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What’s the accessories cover? It bolts directly to the block and that’s it.

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FROGMAN524 · Sep 18, 2019

NC-smokinlmm said:
Take it to the track already...

Too hot still. Waiting for winter.

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S Phinney · Sep 18, 2019

FROGMAN524 said:
What’s the accessories cover? It bolts directly to the block and that’s it.

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I will get you a picture. It’s the piece the alternator is bolted in.

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FROGMAN524 · Sep 18, 2019

S Phinney said:
I will get you a picture. It’s the price the alternator is bolted in.

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Thank you.

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FROGMAN524 · Sep 22, 2019

S Phinney said:
I will get you a picture. It’s the piece the alternator is bolted in.

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Do you have a pic? I suspect I’d have to fabricate myself

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S Phinney · Sep 22, 2019

FROGMAN524 said:
Do you have a pic? I suspect I’d have to fabricate myself

These came in the HSP kit. Did you use their stuff or others? It wouldn’t be too hard to fabricate but if it’s HSP I could get you the items.
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