lmm timing table

[jwrkansas]

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

 

[slipclutchms]

whats your rev limit?

 

[slipclutchms]

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]

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]

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]

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]

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.

 

[Harbin_22]

Mine held good RP with 3200. It was extremely low mileage motor (5,000ish)but did fine.

 

[whytry]

Duh guess i needed a reminder that's how lmm tables are...

 

[slipclutchms]

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.....

 

[Harbin_22]

3200 made 505hp on dunbars dyno. Stock turbo/injector

 

[gmduramax]

My LMM liked 3000 pulse and 32* of timing. Ran 12.56 full weight.

 

[slipclutchms]

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

 

[Bobo]

Are your data logs following your timing table?

 

[jwrkansas]

Seems like they are, I need to run it again and check. Why do you ask?

 

[bluessmax]

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.