lmm timing table

jwrkansas

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Mar 3, 2012
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Been messing around with my lmm timing tables. Thought I would post this and see if I could drum up any criticism. Thanks for looking
 

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slipclutchms

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May 24, 2010
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what else is done to the truck? at fist glance I would say thats a touch to much timing in the max effort area 3200 rpm 100 to 120 mm3
 

whytry

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Oct 11, 2010
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To much timing in top rpms and why does it jump up so quick? Whats your limiters set at?
Lmms dont need crazy timing you will see better results at 28 deg
 

jwrkansas

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Mar 3, 2012
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trucks a stock turbo/fuel truck. 3250 pulse. rev limit is 3400 iirc. Dont know why it jumps up so quick, used the timing calculator.any suggestions other than 28 degrees?
 

slipclutchms

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May 24, 2010
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3250 is a ton of pulse.......I highly doubt youll hold rail pressure with that kinda pulse.....turn pulse down to max like 2950. 28 to 29 degrees max is fine....The timing calc figured those timing numbers based on your other tables so my guess would be that your pulse table has some huge jump in it. Whats your rail pressure table look like?
 

JoshH

Daggum farm truck
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Feb 14, 2007
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Texas!!!
To much timing in top rpms and why does it jump up so quick? Whats your limiters set at?
Lmms dont need crazy timing you will see better results at 28 deg
If you're talking about the large jump in the last column, it is because the RPM goes from 3400 to 4800.

3250 is a ton of pulse.......I highly doubt youll hold rail pressure with that kinda pulse.....turn pulse down to max like 2950. 28 to 29 degrees max is fine....The timing calc figured those timing numbers based on your other tables so my guess would be that your pulse table has some huge jump in it. Whats your rail pressure table look like?

I've seen a few LMMs that can hold 26k PSI with that much pulse width. Their injectors flow quite a bit less than than the LB7, LLY, or LBZ.
 

slipclutchms

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May 24, 2010
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If it holds rail pressure at that high of a pulse.....it is still a ton of pulse! For engine longevity sake I would reduce the pulse a ways.....;)
 

slipclutchms

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May 24, 2010
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How much smaller are Lmm injectors when compared to Lbz injectors? Just curious.....what are the actual flow numbers?
 

bluessmax

Tabasco Injected!
Nov 4, 2010
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To inject the fuel at the big rpms it takes some timing otherwise your just throwing out the exhaust. Harsh yet Conservative uS and big pressure have served us well. As many know, LMM doesn't follow commanded rail so ya gotta play the tricks.