L92 early rev limit, trouble with VSS....
#1
Staging Lane
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L92 early rev limit, trouble with VSS....
I have a 2007 L92 engine. My rev limit is 3800 rpm. I obviously have problems with the VSS.
I use an inductive speed sensor with two wires. What kind of speed sensor works with the ECM? Any suggestions?
I use an inductive speed sensor with two wires. What kind of speed sensor works with the ECM? Any suggestions?
#2
Have seen auto tunes limit at around 4000rpm no matter what you do to the rpm limits
Post tune and we can look at it for you
#3
Staging Lane
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I don't have the ecuipment to post the tune:/
The company that made the setup (harness package) said that if I don't connect the VVS I will have problems with higher revs. See quote below;
"I did notice that without a VSS input there is a 3800-4000 rpm rev limiter that I don't have a way of shutting off. You will need to make sure the VSS sensor is hooked up and working properly for the engine to rev higher."
I have the VSS connected but I still have problems with the rev cut at 3800rpm. No matter how I twist and turn the cabels, since my speedometer works the ECM gets a signal...
The company that made the setup (harness package) said that if I don't connect the VVS I will have problems with higher revs. See quote below;
"I did notice that without a VSS input there is a 3800-4000 rpm rev limiter that I don't have a way of shutting off. You will need to make sure the VSS sensor is hooked up and working properly for the engine to rev higher."
I have the VSS connected but I still have problems with the rev cut at 3800rpm. No matter how I twist and turn the cabels, since my speedometer works the ECM gets a signal...
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#9
TECH Junkie
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Im pretty sure its VSS related. For some reason the PCM does not accept signal from my t56. I know the signal is fine as my autometer speedo is working fine but when I scan and drive it the scanner speedo stays at zero. I tried setting the fuel cut offs in park/neutral to 6900 as I have read some boat guys run these engines fine without VSS input so I figured what the heck? But still nada. I have the VSS wired to pins 71+72 x1 conn.
Unnfortunately I cannot attach my tune file here I tried but its too big. Can you PM me your email address and I'll send it to you?
Unnfortunately I cannot attach my tune file here I tried but its too big. Can you PM me your email address and I'll send it to you?
#10
Most calibrations have a Bad-Vss fuel cutoff, which may be much lower than normal limiter. On these calibrations you rise that value to match your normal limiter and you're set.
In the 2007 L92 file I have I see no Bad-Vss limiter, only a Park-Neutral limiter of 4000 RPM, this may be it.
In the 2007 L92 file I have I see no Bad-Vss limiter, only a Park-Neutral limiter of 4000 RPM, this may be it.
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Tyrone424 (04-05-2022)
#12
Open the Cutoff RPM vs. Gear table (normal)
It is a table from 1st to 6th gear plus Park, neutral and Reverse. Each has a cutoff RPM limiter. In the stock calibration I have, both neutral and park are set to 4000
#13
Staging Lane
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i sent my computer to speartech and they fixed it. I dont know what they did. I run my car on bench dyno last month and i had 463ps with a stock L92 . Still got an issue with error codes both fuel bank lean though.
#17
Launching!
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I'm having the same problem on a (2) 2007 5.3(E38) and a (1)2008 6.0(E38) all 3 vehicles have TH350 transmission's and I set the rev limiter everywhere I could see a rev limiter function to 8,000RPM's but they all still rev limit at 5,500RPM....
I used EFI Live on these conversion's
I used EFI Live on these conversion's
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Tyrone424 (04-05-2022)