LSx swap question...
Thread Starter
Safety Car
Joined: Feb 2000
Posts: 4,564
Likes: 110
From: Austin Texas
LSx swap question...
Did any of you consider changing the dash cluster over to a C5/C6 cluster when you did your swap?
It's just a thought I had while driving today...wouldn't that be a lot easier to get the C5/C6 instrument cluster working rather than piggy-back onto the stock ECM to run the C4 cluster?
It's just a thought I had while driving today...wouldn't that be a lot easier to get the C5/C6 instrument cluster working rather than piggy-back onto the stock ECM to run the C4 cluster?
Last edited by 1991Z07; Jan 4, 2013 at 04:29 PM.
Melting Slicks
Joined: Feb 2011
Posts: 2,322
Likes: 6
From: Los Altos CA
Thread Starter
Safety Car
Joined: Feb 2000
Posts: 4,564
Likes: 110
From: Austin Texas
All I'm interested in is the drivers cluster...if it is the same general size as the C4 cluster it should be an easy swap.
Thread Starter
Safety Car
Joined: Feb 2000
Posts: 4,564
Likes: 110
From: Austin Texas
Also...has anyone figured out a fix for ABS?
Although I "technically" don't need it in a race car, I LIKE it and use it to the maximum when I'm on track.
And I don't flat spot race tires...which is a HUGE plus.
Although I "technically" don't need it in a race car, I LIKE it and use it to the maximum when I'm on track.
And I don't flat spot race tires...which is a HUGE plus.
Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
My dash works fine running off a combination of the LS1 PCM feeds and the stock sensors. The Speedo tach was off with the L98 but its right on the money with my LS... The ABS I'm not sure of just yet.
There was a write up about fixing the late tachs with a resistor. I think if this resistor is taken out or replaced with a different value the tach could be "dialed" in. My oil is pegged but I believe that to be a wiring mistake on my part. I am running all the same old wiring and the oil sender from My L98 with an adapter it should work just as it used to. The Temp reads a little high but again I think this has always been an issue, I can now see because I have a "smart" PCM.
There was a write up about fixing the late tachs with a resistor. I think if this resistor is taken out or replaced with a different value the tach could be "dialed" in. My oil is pegged but I believe that to be a wiring mistake on my part. I am running all the same old wiring and the oil sender from My L98 with an adapter it should work just as it used to. The Temp reads a little high but again I think this has always been an issue, I can now see because I have a "smart" PCM.
Last edited by ch@0s; Jan 5, 2013 at 02:02 PM.
Racer
Joined: Sep 2006
Posts: 289
Likes: 0
From: Newark DE
As simple as a reistor, or jumper to fool the EBCM into thinking the ASR setup is still installed. Since ABS and ASR are so intimately linked, it would be ashame to lose ABS just because the crap ASR system is removed. There are some threads here about removing the ASR, I just need to find time to go through the EBCM schematic in the FSM and also pull the codes to see if I can get the ABS light off..
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Thread Starter
Safety Car
Joined: Feb 2000
Posts: 4,564
Likes: 110
From: Austin Texas
I haven't attacked ABS yet, I'm hoping it's
As simple as a reistor, or jumper to fool the EBCM into thinking the ASR setup is still installed. Since ABS and ASR are so intimately linked, it would be ashame to lose ABS just because the crap ASR system is removed. There are some threads here about removing the ASR, I just need to find time to go through the EBCM schematic in the FSM and also pull the codes to see if I can get the ABS light off..
As simple as a reistor, or jumper to fool the EBCM into thinking the ASR setup is still installed. Since ABS and ASR are so intimately linked, it would be ashame to lose ABS just because the crap ASR system is removed. There are some threads here about removing the ASR, I just need to find time to go through the EBCM schematic in the FSM and also pull the codes to see if I can get the ABS light off..
Turner Motorsports has one they use from an M3...http://www.turnermotorsport.com/p-37...g-harness.aspx
I like that it is a true 4-channel ABS system, not 3-channel like most OEM's are set up with (2-channels front, 1-channel rear).
Could get a bit pricey...but I have some BMW connections and might be able to seriously undercut their prices. That, and I think sourcing the pump and other components besides the brain from a wrecked car could save a bunch as well. The entire system from them (harness, controller, pump, sensors) with new parts is close to $12k...I think I could cut that in half easy.
Epic Motorsports also sell a similar harness http://store.bimmerworld.com/epic-mo...tem-p1691.aspx for WAY less money...over $1200 less than Turner's.
Last edited by 1991Z07; Jan 6, 2013 at 12:54 PM.
Racer
Joined: Sep 2006
Posts: 289
Likes: 0
From: Newark DE
The 3 codes were a bad Right Front Sensor, TPS failure, and Data Link failure. I cleared them all and only the RF sensor returned but since I didn't hook up the LS TPS to the C4, I expect it will return once the car moves. (The RF sensor is checked at key-on, the TPS checked at drive time)
If the Data Link error doesn't reoccur (I don't expect it to since I'm still running both LT1 ECM and CCM) I believe all that needs done is to get a TPS signal into the EBCM. This may be more of a issue for me since I retained the DBW LS3/L99 throttle-body and I've failed in most every other digital sensor connection to both the LS3 ECM and the C4. A standard DBC TPS might be easier by I can't comment.
But if you're not running the stock ECM/CCM, there may be additional issues (like the Data Link) that will keep the stock ABS system from functioning.
Thread Starter
Safety Car
Joined: Feb 2000
Posts: 4,564
Likes: 110
From: Austin Texas
I did pull/check the ABS codes from my swap car yesterday. (Since I bought my car non-functioning, I never know what pre-existing conditions were there and what I caused by the LS swap)
The 3 codes were a bad Right Front Sensor, TPS failure, and Data Link failure. I cleared them all and only the RF sensor returned but since I didn't hook up the LS TPS to the C4, I expect it will return once the car moves. (The RF sensor is checked at key-on, the TPS checked at drive time)
If the Data Link error doesn't reoccur (I don't expect it to since I'm still running both LT1 ECM and CCM) I believe all that needs done is to get a TPS signal into the EBCM. This may be more of a issue for me since I retained the DBW LS3/L99 throttle-body and I've failed in most every other digital sensor connection to both the LS3 ECM and the C4. A standard DBC TPS might be easier by I can't comment.
But if you're not running the stock ECM/CCM, there may be additional issues (like the Data Link) that will keep the stock ABS system from functioning.
The 3 codes were a bad Right Front Sensor, TPS failure, and Data Link failure. I cleared them all and only the RF sensor returned but since I didn't hook up the LS TPS to the C4, I expect it will return once the car moves. (The RF sensor is checked at key-on, the TPS checked at drive time)
If the Data Link error doesn't reoccur (I don't expect it to since I'm still running both LT1 ECM and CCM) I believe all that needs done is to get a TPS signal into the EBCM. This may be more of a issue for me since I retained the DBW LS3/L99 throttle-body and I've failed in most every other digital sensor connection to both the LS3 ECM and the C4. A standard DBC TPS might be easier by I can't comment.
But if you're not running the stock ECM/CCM, there may be additional issues (like the Data Link) that will keep the stock ABS system from functioning.
With a ZR1 harness in the car, and using an LT1 ECM trying to drive the dash & other systems...I might be asking for many nights of frustration.
And I plan to go drive by cable...it is a race car, so the less electronics I throw at it the better reliability I'll have.
I was talking to a Corvette shop owner who is a good friend...his suggestion was to scrap the LS computer all together and get a F.A.S.T. system.
I hadn't considered that until now, but think I might at least investigate it. They have a VSS output option available...might be a better solution in the long run for me.
I need to dig into the manuals...I ordered the '92 Shop Service Manuals for the ZR1. Waiting for them to ship now...this car had ASR on it as well. For all the hassle of getting the OEM systems to talk to each other again...it might be easier to get an ECM that is a little more flexible.
Since I haven't really started yet...all options are open.
Last edited by 1991Z07; Jan 6, 2013 at 02:00 PM.
Racer
Joined: Oct 2010
Posts: 414
Likes: 0
From: Phoenix Arizona
I wish I could be of more help to you guys, but I'm IT challenged. I can tell you that the computer interface that was built for the installation of my LS3 Hot Cam apparently solved some of the problems you are dealing with. My ABS works fine, the problem with the tach was solved, the digital functions of the C4 dash were saved, etc. The only two functions that we did not try and save are cruise control and traction control. I don't miss the cruise control but wish I had traction control from time to time. If any of you would like more details on the computer interface that I have, send me a PM and I'll give you the contact info for its builder in Fla.