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928sg

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Posts posted by 928sg

  1. can't get running with Thunder

    in G4+

    Posted

    yep the firing order is correct, and I tested all of the coils.   Firing on the correct cylinders.    this is a 6.4 liter 32 valve 90 degree V8, with some really lumpy cams.   It has 8 50mm ITB's and I haven't gotten them sync'd yet, and I haven't had time to get back out in the garage after getting it started.I just adjusted the throttle stops so it would idle without me holding the throttle open.   I'll have to get the idle bleeder screws scync'd and the linkage as well,   I also need to dial back the dwell on the COP.  as it is using the standard table.  Do you have a screen shot or a table I could import for the dwell table?

    I also downloaded a table for the ID725 injectors but my ecu won't let me import it stating it is locked for another ECU.    I think I downloaded it from Injector Dynamics.  any way to get them unlocked?

    ShortPulseWidthAdderID725.lte INJDeadtimesID725300kpa.lte

  3. can't get running with Thunder

    in G4+

    Posted

    I set the priority to trig 1, and set the trigger offset to 302 and it kept dying on start.   I finally bypassed the factory fuel pump relay and she runs~!     runs rough and rich but it starts.   I just have to figure out how to use the factory relays.

     

  6. can't get running with Thunder

    in G4+

    Posted

    Just now, Vaughan said:

    Does the 928 have a cam sync? If it only has the flywheel sensor then it won't have a trigger two.

    The polarity on your trigger 1 sensor is incorrect, the falling edge should be almost vertical and the rising edge should have the gentler slope. Swap your trigger 1 wires around to fix this.

    trigger 2 is a hall sensor on the cam see above post

  11. can't get running with Thunder

    in G4+

    Posted

    I was out setting the base timing.   I don't have a timing  light to set it the correct way.    I've got a pcl file from a running 928, so I think the correct timing is -58  It sounds like it is really trying to catch.   do you mean a trigger scope from the link software?

  12. can't get running with Thunder

    in G4+

    Posted

    I'm running ID725 injectors, and found a couple of tables I wanted to add to my config but found out they were locked.   I also know I need to adjust the dwell settings on the coils, but I don't know what a good table looks like for my VAG coils.   Any info on either would be appreciated even if it is a screen shot of a good table.   I can get it entered in.

  17. LSU 4.9 question

    in G4+

    Posted

    The LSU 4.9 that I have from Ballenger has this bulky connector requiring a rather large hole through the firewall, In talking to BM, I was told this was for ecu's that can't do a free air calibration.    Did I buy the wrong O2 sensors?   Can I de pin and put the smaller standard LSU 4.9 connector on it and use it that way?   I'm not that experienced in the newer wideband sensors.

  18. Question about VW/Audi VAG coils

    in G4+

    Posted

    I've been reading on a lot of forums that the coils have 2 grounds, and here on the link forums I was told to ground both grounds to the cylinder heads, but I've been reading that you are supposed to wire one of the grounds to the sensor grounds.   Which one is correct?

    VAG snipit.JPG

  23. ABS sensors for digital inputs for Porsche 928

    in G4+

    Posted

    I'm adding this here, because I posted on Facebook but that is a horrible place to keep technical info because searching for stuff even a few weeks old is difficult.

    I asked:
    what is the consensus on using the ABS sensors for traction control? ECU is Link Thunder, and it would be preferable to not interfere with the ABS system.

    Adamw: The Thunder differential DI’s 11-16 are specifically designed for tapping into ABS signals without upsetting the ABS. Assuming they are common VR or hall sensors (not magnetoresistive)

    me:  Front ABS sensor is the same as the Porsche 944 and 968. This is for a Porsche 928. They have a metal shell on them which on the below link indicates they are passive. https://www.apecbraking.co.uk/.../Techni.../ABS-Sensors.aspx

    Adamw: The 928 Front sensors will be VR

    Me: rear abs sensors are the same as front just different wire lengths https://www.boschautoparts.com/en/auto/adas/wheel-speed-sensor?partID=0265001118&fbclid=IwAR1GqYZhpppJI2yvq8NACCadDZUX2qlIH90qcQ2H1zIwqv1SDqVoc2vQ_iQ 

    I wanted to post this here so that others can search and find this info.
     

    additional follow up question.  for a VR sensor would we use the DI positive or negative inputs for the Thunder ECU?

  25. VAG (VW/Audi) Bosch Coil 07K905715G & wire size

    in G4+

    Posted

    I'm using the VAG Bosch Coil 07K905715G

    I'm planning on using the following wire sizes

    power positive(12v+) 18AWG TXL 
    power ground 18AWG TXL 
    ecu signal (5v)  20AWG (Link Harness supplied)
    signal ground 20AWG TXL 

    This is for a NA 90 degree V8 with a max RPM of 7500.     For power, I'm planning on running one 14AWG TXL to each bank ( approximately 48 inches from relay) and then split out to four 18AWG TXL (lengths ranging from 12 inches to 20 inches)

    This is my 1st foray into coil on plug so I don't know much about dwell, current & current draw.  I found quite a bit of info about calculating the current draw but I don't have a scope.

     

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