L92/VVT in C4 vette LS/T56 swap
09-15-2012, 06:27 PM
#81
Some more testing with the VSS:
Nothing I did with my 2007 Escalade L92 VVT OS would put my scanner at 158mph, so I can't be of any help with those having that problem.
The VSS output pin of the E38 (X1-57) would give me a 128Kppm, but no settings in HPT would scale that down, only up. I had that wire feeding the 4Kppm signal wire for the C4 (normally comes from the C4 ECM) and it was read correctly, but with no capability to scale it down, it was useless. A Dakota Digital SGI-5 box could be used to scale it down, but that cost $, has additional wiring and PWR/GND connections and adds another point of failure IMHO..
So for my "modern" car having an ECM already connected and piggybacked, I have the T56 (~45,500ppm) sine wave VSS signal feeding the C4 ECM. It outputs a 4Kppm square wave that feeds all of the car's other systems (including Speedo) and I tapped that signal and back fed into the E38 TOS pin. I enabled RepTOS as above and scaled the HPT "VSS Output Pulse per" setting to 45,000. The car now reads a valid (but wrong) MPH on the speedo as well as a valid and correct value on the scanner..
I still need to dig out my old PROM burning equipment and reprogram the C4 ECM for a 45,500ppm VSS to get the speedo scaled correctly, then I can also go back to HPT and should be able to set the "VSS Output Pulse per" parameter to 4000 ppm.
Nothing I did with my 2007 Escalade L92 VVT OS would put my scanner at 158mph, so I can't be of any help with those having that problem.
The VSS output pin of the E38 (X1-57) would give me a 128Kppm, but no settings in HPT would scale that down, only up. I had that wire feeding the 4Kppm signal wire for the C4 (normally comes from the C4 ECM) and it was read correctly, but with no capability to scale it down, it was useless. A Dakota Digital SGI-5 box could be used to scale it down, but that cost $, has additional wiring and PWR/GND connections and adds another point of failure IMHO..
Code:
The HPT Speedo setting for "Vehicle Speed Output" doesn't appear
to an output, but instead is an input setting for the TOS (X1-71) pin. This
can be set to:
- Disabled: The E38 will look for a Discrete Sine Wave VSS signal on
both VSS hi (X1-71) and VSS lo (X1-72). The T56 VSS
drove this setup correct but the VSS wasn't strong enough
to split between both ECMs.
- RepTOS: The E38 will look for a single wire digital VSS signal on just
the TOS (X1-71) pin as if it was coming from a TCM.
- Serial: The ECM will ignore X1-71 and pull a VSS signal from the
CAN bus I still need to dig out my old PROM burning equipment and reprogram the C4 ECM for a 45,500ppm VSS to get the speedo scaled correctly, then I can also go back to HPT and should be able to set the "VSS Output Pulse per" parameter to 4000 ppm.
Last edited by 85MikeTPI; 09-15-2012 at 06:40 PM.
09-16-2012, 12:00 PM
#83
Onward..
09-27-2012, 06:37 PM
#84
Finishing all of the minutia of the swap. All new plug wires, hoses, etc. putting on the covers, panels, etc. Exhaust assembly begins this week.
2007 Escalade L92 PCM wiring diagrams in case anyone looks here instead of searching
2007 Cadillac Escallade ESV 6.2 L92 Vin 8.pdf
DBW Pedal, stock clutch&brake pedals, kick panels, and OBD-II connector
Mounting of B&B axle-back exhaust and Spare Tire carrier
GTO 17" Spare tire
Axle-back, spare tire, carrier
2007 Escalade L92 PCM wiring diagrams in case anyone looks here instead of searching
2007 Cadillac Escallade ESV 6.2 L92 Vin 8.pdf
DBW Pedal, stock clutch&brake pedals, kick panels, and OBD-II connector
Mounting of B&B axle-back exhaust and Spare Tire carrier
GTO 17" Spare tire
Axle-back, spare tire, carrier
10-15-2012, 12:12 PM
#85
Header connections, Random Tech metal matrix bullet cats, and Magnaflow X-pipe
Attached to Billy Boat axle-back full 3inch dual exhaust
Removable exhaust section all fully welded
I have almost 300mi on the build right now after taking it
down to the Ocean City MD Corvette Cruise. Everything survived and tuning and small patch jobs continue to refine it.
Car runs strong in the occasional sub-4000rpm jaunt. I hope to have it at the track for a shake-down run and then the dyno soon after and before Winter sets in.
Attached to Billy Boat axle-back full 3inch dual exhaust
Removable exhaust section all fully welded
I have almost 300mi on the build right now after taking it
down to the Ocean City MD Corvette Cruise. Everything survived and tuning and small patch jobs continue to refine it.
Car runs strong in the occasional sub-4000rpm jaunt. I hope to have it at the track for a shake-down run and then the dyno soon after and before Winter sets in.
.. I can't wait to get mine finished and be able to drive it. 
10-20-2012, 06:22 AM
#89
Melrose is the only one making C4 LS swap headers AFAIK.
http://www.eecis.udel.edu/~davis/z28...aders-mtrmnts/
11-08-2012, 03:15 PM
#90
E38 L92 ECM and '97 MonteCarlo/Lumina underhood fuse&relay box mount in front nose of vette
Attachment 355359
Attachment 355359
2003 Impala underhood fusebox, modified for L92 engine harness circuits. Engine harness connections extended from the firewall area, to area in front of wheel.
Attachment 367760
Attachment 367764
Attachment 367761
Attachment 367760
Attachment 367764
Attachment 367761
11-08-2012, 03:16 PM
#91
There's some really interesting reading on dampers & timing chains in this thread: https://ls1tech.com/forums/generatio...n-failure.html
Last edited by -TheBandit-; 11-08-2012 at 03:43 PM.
11-08-2012, 04:16 PM
#92
http://www.ebay.com/itm/03-IMPALA-FU...item25776a6c6e
Is the same. I took apart the 2 boxes and made one full box.
But then again I do see them referenced as MC/Lumina too, so GM may have used then in other apps..
http://www.ebay.com/itm/95-96-97-98-...-/290771217548
Had all I needed and I even used one of the extra relays for the 3 relay fan circuit the E38 wanted.
Last edited by 85MikeTPI; 11-08-2012 at 04:47 PM.
11-08-2012, 04:21 PM
#93
What made you go to the ATI damper? Those things are so pricey!
There's some really interesting reading on dampers & timing chains in this thread: https://ls1tech.com/forums/generatio...n-failure.html
There's some really interesting reading on dampers & timing chains in this thread: https://ls1tech.com/forums/generatio...n-failure.html
11-08-2012, 04:25 PM
#94
At the moment I didn't have plans to change mine from stock, but I'll search around for more info. Do you know if the separating stock dampers are more common on manual applications or is there a specific failure cause?
I don't see those things listed anywhere for less than $350. Ouch.
I don't see those things listed anywhere for less than $350. Ouch.
11-08-2012, 04:56 PM
#95
At the moment I didn't have plans to change mine from stock, but I'll search around for more info. Do you know if the separating stock dampers are more common on manual applications or is there a specific failure cause?
I don't see those things listed anywhere for less than $350. Ouch.
I don't see those things listed anywhere for less than $350. Ouch.
. My application is road course and autox, which seems to be harder on the damper/chain also.The ati is expensive, but so is a broken valvetrain... I tend to throw $ at something I'm likely to stress..
11-21-2012, 09:00 PM
#98
Mine just fell to the bottom of the pan where it still is.... and might stay if I cant fish it out. As for the Power Bond Pulley? SFI allll they way its a good'r for the dough imo
I didnt notcie anything different driving it so I cant say when the tensioner failed I just thought to check it while I had the car in the shop and working on it. Costs me nothing but a couple of hours of time as I re-use the gaskets and the crank bolt is an ARP. Of course that was until I inspected the phaser and released the spring *uff* Anyways new phaser supposed to be here tomorrow
I didnt notcie anything different driving it so I cant say when the tensioner failed I just thought to check it while I had the car in the shop and working on it. Costs me nothing but a couple of hours of time as I re-use the gaskets and the crank bolt is an ARP. Of course that was until I inspected the phaser and released the spring *uff* Anyways new phaser supposed to be here tomorrow
11-21-2012, 10:48 PM
#99
Clint was asking about the stock damper failing, but
The tensioner is something else to watch for. I think
It's been noted that the Katech chain is tighter and a
Broken tensioner probably won't affect the motor as long
As the pieces don't like you're hoping.. (and I would hope
Too)
The tensioner is something else to watch for. I think
It's been noted that the Katech chain is tighter and a
Broken tensioner probably won't affect the motor as long
As the pieces don't like you're hoping.. (and I would hope
Too)
Mine just fell to the bottom of the pan where it still is.... and might stay if I cant fish it out. As for the Power Bond Pulley? SFI allll they way its a good'r for the dough imo
I didnt notcie anything different driving it so I cant say when the tensioner failed I just thought to check it while I had the car in the shop and working on it. Costs me nothing but a couple of hours of time as I re-use the gaskets and the crank bolt is an ARP. Of course that was until I inspected the phaser and released the spring *uff* Anyways new phaser supposed to be here tomorrow
I didnt notcie anything different driving it so I cant say when the tensioner failed I just thought to check it while I had the car in the shop and working on it. Costs me nothing but a couple of hours of time as I re-use the gaskets and the crank bolt is an ARP. Of course that was until I inspected the phaser and released the spring *uff* Anyways new phaser supposed to be here tomorrow
