L92 VVT e38 cam swap tune with a t56?
10-24-2011, 07:05 PM
#21
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Congrats! Are you running open headers? I fired mine up a while back and it takes about five seconds for all 8 to kick in but runs fine once they do. It sounds completely different than my LS1, in a very good way! I'm hoping once I get the tune sorted out it'll fire normally but we'll see. I got a mail order tune from Geoff at EPS and he didn't even know about not being able to disable VATS. I had to take it to a local guy with HP Tuners and after a little playing around it fired off.
10-24-2011, 07:10 PM
#22
No through full exhaust. The car is done aside from a couple of minor things now. I still have to fab up my 4" MAF/intake assembly and remove and wrap the harness. Right now I have the stock Escalade MAF clamped right onto the throttle body just for test firing etc.
But yes it does sound quite different than my LS1 did. A lot more THUD is how I would describe it. I havent had time to play with the tune anymore today but maybe tomorrow
But yes it does sound quite different than my LS1 did. A lot more THUD is how I would describe it. I havent had time to play with the tune anymore today but maybe tomorrow
10-24-2011, 07:18 PM
#23
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I agree, it has the same cackle but hits harder. If it were from a stereo I'd say it's like listening to the same music with a 10" sub vs a 15" sub, same notes but more punch! I drove mine around a little bit and even with a crap tune you can tell it has a TON of low end power. I could practically dump the clutch at idle and have it just take off. Glad to hear I'm not the only one with a running L92 swap on the stock ecu.
If you want to go to a different MAF you can run the LS7 "credit card" style if you swap the pins around. I forget where they go off the top of my head but it's pretty simple and lets you run just about any intake setup you want.
If you want to go to a different MAF you can run the LS7 "credit card" style if you swap the pins around. I forget where they go off the top of my head but it's pretty simple and lets you run just about any intake setup you want.
10-24-2011, 07:21 PM
#24
Hahaha Im literally on GM part direct ordering the LS7 card now. Im trying to find the cheapest source for the MAF bung though. I found a spectre MAF housing for the LS7 card for $32 at Summit but its already welded into a pipe. I just want the bung but so far 45 bucks is the best deal ive found and that is insultingly pricey considering the MAF card itself is only 50 bucks.
**EDIT** I found a PN for the bung through GMparts direct
Bung: PN 19166574 and it runs $9.27
LS7 MAF PN: 15865791 and its $55.52
**EDIT** I found a PN for the bung through GMparts direct
Bung: PN 19166574 and it runs $9.27
LS7 MAF PN: 15865791 and its $55.52
Last edited by cam; 10-24-2011 at 07:33 PM. Reason: Found it!
10-24-2011, 08:41 PM
#25
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There ya go, if I'd been quicker I would have told you it's under $10 from GM. Glad you found it! I'm using a 4" pipe for an intake, flows great but expect to have to change your air flow tables a lot, mine needed about 8% more fuel before it would even start.
10-24-2011, 08:47 PM
#26
Yes tuning this biatch is already proving fun. I did discover over at HP's forum that in most swap cases they require the file to modify fo the VATS patch to work successfully. Even though mine runs apparently it will shut down after 3 minutes of driving then need to be flashed off again. I guess thats life when your stuck with a beta platform. Overall these e38 genIV systems are a much bigger PITFA than the LS1 stuff was.
11-17-2011, 11:47 AM
#28
To update this thread for any future searchers. I solved all the gremlins. The alternator issue is still a bit weird in that it takes a minute or three for the PCM to "excite" the alternator but it does work fine and doesnt pull any codes so a small bump to live with. The VATS issue turned out to be my fault as I had the one feed for the ECM power to 12v+BAT when it was supposed to be 12V+IGN. An easy oversight considering the looooong hours and late nights I was putting in to get this thing done so thats all good. The VSS proved to be quite a challenge as did the torque management but long story short the good news is Chris at HP wrote me some new code that fixed up my issues and no more 4000 RPM mystery fuel cut. They will be adding these to future versions of HP so keep your eyes open. I was impressed with the customer service on that truthfully as it had a lot of people scratching their heads over. Ive noticed a lot of L92/LY6 swappers who want to run a non supported oem transmission have their speedo peg at 158 mph but mine does not so hopefully whatever they figured out will also help you guys.
As for the VVT tuning itself? So far it actually seems to be a lot simpler than I had first feared. I havent yet been to a dyno to verify my tweaks but seeing as they are calling for snow tonight? It may just have to wait until spring. Im still waiting on my MAF card and bung anyways so its not completely dyno ready yet so I will update with all that info once Im done.
So far, so good
As for the VVT tuning itself? So far it actually seems to be a lot simpler than I had first feared. I havent yet been to a dyno to verify my tweaks but seeing as they are calling for snow tonight? It may just have to wait until spring. Im still waiting on my MAF card and bung anyways so its not completely dyno ready yet so I will update with all that info once Im done.
So far, so good
11-17-2011, 02:36 PM
#29
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Glad to hear you got it at least mostly sorted out now. I'll have mine on the dyno probably tomorrow and let you know how it goes. No issues yet other than the odd startup on mine but we'll see when I actually start driving it around.
11-17-2011, 03:04 PM
#32
Ahh that'll be a piece of cake to dial in. FWIW mine seems to LOVE ign timing ( compared to stock tables that is ) and the VVT cam phasing curve is way out of whack for power production so make sure the tuner takes a look at those especially down low in the RPM's they are WAY out of place for power. I posted a samle of my timing curve in the thread linked below but ive changed it more since with seat of the pants approval but until I hit the dyno and start real testing its just guesstimation at this stage
https://ls1tech.com/forums/generatio...t-cams-11.html
https://ls1tech.com/forums/generatio...t-cams-11.html
11-17-2011, 06:03 PM
#33
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I would have thought it would be a piece of cake but it won't get over 45% throttle and A/F ratio is all over the place, sometimes rich, sometimes lean without any changes being made. I'm off to do a bunch of research tonight and hope we can make more progress tomorrow.
11-17-2011, 06:16 PM
#35
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I'll check torque management tomorrow and see if that's the culprit. It'll get 90% or so if you just goose it from an idle but as soon as you try to roll on the throttle it shuts down to 45%. I'm going through the other thread right now too so I'll check my timing stuff against yours.
11-18-2011, 06:22 PM
#37
The VSS proved to be quite a challenge as did the torque management but long story short the good news is Chris at HP wrote me some new code that fixed up my issues and no more 4000 RPM mystery fuel cut. They will be adding these to future versions of HP so keep your eyes open. I was impressed with the customer service on that truthfully as it had a lot of people scratching their heads over. Ive noticed a lot of L92/LY6 swappers who want to run a non supported oem transmission have their speedo peg at 158 mph but mine does not so hopefully whatever they figured out will also help you
