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Thread: Interesting info on B3702 Injection timing

  1. #21
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    Quote Originally Posted by LS1_Dragster View Post
    Sorry, here's the specs:

    TSP XS Series Camshaft:
    Magic Stick V.3 237/242 .603/.609" 112 lobe sep. Camshaft.

    The Magic Stick V3 camshaft is Texas Speed's premier LS1 camshaft! This camshaft has gone as fast as 10.50s n/a with stock heads in our 98 Z28 test car.
    This camshaft features Comp Cams XER lobes! The XER lobes have been proven to make big horsepower & torque thanks to their aggressive ramp rates & healthy lift.

    2300-6800 RPM Power Band with a peak around 6400rpm; This is an excellent performance camshaft with a rough idle! Custom tuning required
    That is pretty much the Cam I have on my Pops z06. I chose it for the stretch in power. I will be experimenting with this on my dyno.
    "All that is needed for the triumph of evil is that good men do nothing..."

  2. #22
    Lifetime Member mvvette97's Avatar
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    I would like to hear more about this also.

  3. #23
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    I will do some dyno testing as well, thanks for posting your results.

  4. #24
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    After reading this thread I was curious so I decided to increase the values as described here. Increasing the injector timing by 20% caused the entire tune (idle, part throttle, and WOT) to go way lean. So then I decreased the injector timing values for a net increase of 5% over stock values and the tune was still lean though not as bad as before. Oddly enough the injector duty cycle went up across the board with the increased timing values. In each case I adjusted both the VE and MAF values help compensate but in the end I went back to my existing tune.

  5. #25
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    Is your cam and heads stock?

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

  6. #26
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    DrkPhx, do you have the logs? this is seriously interesting what you've observed.

  7. #27
    Lifetime Member 5.7ute's Avatar
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    Quote Originally Posted by redhardsupra View Post
    DrkPhx, do you have the logs? this is seriously interesting what you've observed.
    x2
    Is there any chance your fuel trims were trying to compensate for the lean condition & increasing the commanded pulsewidth?
    The Tremor at AIR

  8. #28
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    Is your cam and heads stock?
    I'm far from stock. It's an auto car with a large stall and a highly modified, high compression 402 with a fairly large cam. I run 42-lb Delphi injectors with the fuel pressure set at 61 psi (at the rail measured with a mechanical test gauge). I confirmed the lean condition with both the LTFT's and a LM-1 WB which is used for all logs.

    DrkPhx, do you have the logs? this is seriously interesting what you've observed
    I'm still looking for the logs (one was quite long) but I use the BBL function and never renamed the logs when I uploaded them to my laptop. I can't search by date either because the time and date isn't real time when using the BBL.. I will keep searching and post it up when I find it.

  9. #29
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    I found one of the logs. It's not as big as I thought, but there's enough data there to see what happened. As you can see in the log, the car seemed to get progessively leaner towards the end of the log.
    Attached Files Attached Files

  10. #30
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    School me, I must be looking at your log incorrectly, I dont see the "way lean" condition. If I take your entire log over 190 degree, I show the average stft to be .06 and .08

    Lee

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

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