http://www.ls1tech.com/forums HP Tuners | AutoTap | Diablo | MAF Translator | HPP3 | FAST | Gen7 | Big Stuff 3 Sponsored by Diablo Sport en Sun, 22 Nov 2009 10:38:44 GMT vBulletin 60 http://images.ibsrv.net/ibsrv/res/src:www.ls1tech.com/get/forums//images/misc/rss.jpg http://www.ls1tech.com/forums http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207728-best-tuner-lt1.html Sun, 22 Nov 2009 03:39:12 GMT as you see in my sig I have a 97 Z28. so I need to know what would be the best system to use as a beginner. my understanding is that OBII LT1's are limited in tuning systems available.

What about Jet Dynamic Spectrum Tuner? Is this a good system to learn with? What other options are there? ]]> MadMike 97 Z28 http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207728-best-tuner-lt1.html http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207593-misfire-my-6-0-chevelle.html Sat, 21 Nov 2009 19:43:33 GMT I have been battling a misfire problem on my LY6 Chevelle all summer. The car breaks up slightly under heavy throttle between 2000 and 2600 RPM's. It sometimes backfires throught the exhaust but mostly just sound rough. It cleans up immediately at 2600 RPM's.

My tuner pulled the plugs and we found #2 was slightly fouled. He first thought a weak coil. Installed new coil and plug. Still the same issue. Swapped complete coil packs and wires from left bank to right, no difference. Moved injectors around and thought it followed to the #4 spot. Installed brand new GM injector, still has the same issue.

Performed a leakdown test on 2 and 4. 2 is actually 3% better than #4 which has no issues.

If I drive around under light throttle or high RPM heavy or light throttle, all plugs look good as shown in the pic of all 8 plugs. If I drive in the 2000 to 2600 trying to make it run bad, it starts to foul #2 plug.

All my tuner can see from the datalog is some sort of misfire is causing the engine to pull timing.

Specs-
2007 LY6 with 231/237 Cam
L76 intake
LS2 throttle body
LS7 42lb injectors
E38 ECM
Truck MAF

Any suggestions?

Good plugs, did not try to cause problem

#2 plug


#2 plug after driving around causing the problem often. Its kind of hard to see, but there is soot on the white part and a build up around the rim only after about 3 miles of testing. The other plugs have mostly bare metal around the rim.




Dyno run. You can hear it break up at towards the beginning of the run. It made 415/407 on a Mustang dyno.
http://www.youtube.com/watch?v=FNwj2Qal7Y4 ]]> alocker http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207593-misfire-my-6-0-chevelle.html http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207547-transmission-shift-point-questions.html Sat, 21 Nov 2009 17:03:05 GMT I have hptuners.Still a bit cofused. If you have normal 4l60 car you can punch in your new gear change and tire height and let it auto figure out new shift points part throttle,full throttle, tcc lockup..etc. So going say from 3.23 stock 4l60 to 3.73 gears would not be much of a big deal. But... I have hptuners.Still a bit cofused. If you have normal 4l60 car you can punch in your new gear change and tire height and let it auto figure out new shift points part throttle,full throttle, tcc lockup..etc.

So going say from 3.23 stock 4l60 to 3.73 gears would not be much of a big deal. But now what about if you change redline and wot shift point rpm.So now instead of stock you are say shifting at 6600 rpm versus say 6000 .Not sure my auto scaling takes rpm into account..don't seem to..does it?
I dont' think see any changes in the part throttle or full throttle mph tables when change out shift rpm points.

And what about effect of bigger stall like going from stock to 2800 or 3400 or even 3600 . I am not supposed to lock my stall past 30% throttle so would assume this is going to have an effect on my shift mph points as well due to slippage?

And to make things more confusing I got a 4l80 segment swap ,so that means the given shift points for part and full throttle in mph are based on truck with like 2.73 gears stock. So now if I auto change values which for some reason is not working right for me so having to input this stuff manually including speed correction then still the values calculated are maybe way out to launch as truck rpm limits are like 5000 and mine are like 6500 shift points 7000 redline.And car shift points are based on the 4l60 gear set in trans aren't they..which are like 3.08 first gear compared to my 4l80 2.48 first, 1.48 second. Don't these internal gear ratios affect the desired shift points in part and full throttle?

I have found f body gear calculator that can show what you can get in each gear and rpm ,guess it just would be off a bit depending on converter slippage. ]]> MY99TAWS6 http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207547-transmission-shift-point-questions.html http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207546-transmission-shift-point-questions.html Sat, 21 Nov 2009 17:00:16 GMT I have hptuners.Still a bit cofused. If you have normal 4l60 car you can punch in your new gear change and tire height and let it auto figure out new shift points part throttle,full throttle, tcc lockup..etc. So going say from 3.23 stock 4l60 to 3.73 gears would not be much of a big deal. But... I have hptuners.Still a bit cofused. If you have normal 4l60 car you can punch in your new gear change and tire height and let it auto figure out new shift points part throttle,full throttle, tcc lockup..etc.

So going say from 3.23 stock 4l60 to 3.73 gears would not be much of a big deal. But now what about if you change redline and wot shift point rpm.So now instead of stock you are say shifting at 6600 rpm versus say 6000 .Not sure my auto scaling takes rpm into account..don't seem to..does it?
I dont' think see any changes in the part throttle or full throttle mph tables when change out shift rpm points.

And what about effect of bigger stall like going from stock to 2800 or 3400 or even 3600 . I am not supposed to lock my stall past 30% throttle so would assume this is going to have an effect on my shift mph points as well due to slippage?

And to make things more confusing I got a 4l80 segment swap ,so that means the given shift points for part and full throttle in mph are based on truck with like 2.73 gears stock. So now if I auto change values which for some reason is not working right for me so having to input this stuff manually including speed correction then still the values calculated are maybe way out to launch as truck rpm limits are like 5000 and mine are like 6500 shift points 7000 redline.

I have found f body gear calculator that can show what you can get in each gear and rpm ,guess it just would be off a bit depending on converter slippage. ]]> MY99TAWS6 http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207546-transmission-shift-point-questions.html http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207484-dyno-tuning-epp-our-mustang-dyno-efilive-600-00-a.html Sat, 21 Nov 2009 11:21:43 GMT *http://www.exoticperformanceplus.com/services.php?service=28 Here is a link to our dyno tuner. Bob* http://www.exoticperformanceplus.com...php?service=28

Here is a link to our dyno tuner. Bob ]]> Exotic Performance Plus http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207484-dyno-tuning-epp-our-mustang-dyno-efilive-600-00-a.html http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207399-lt1-f-body-vs-y-body-tune.html Sat, 21 Nov 2009 02:33:54 GMT Ok so I did some searching but didn't find much. I have a 95 Formula that has had a tune done by previous owner. Previous owner also said he could tell a decent improvement in before & after performance wise.

I also have a 95 bone stock Corvette. Both are A4, K&N, Magnaflow, stock long block equipped. Only difference is the Fbody has LT headers. I am wondering if I can upload the tune from the Fbody to the Ybody ECM with no side effects?

Has anyone else done this or know someone who has? Thanks in advance. ]]> 954mula http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207399-lt1-f-body-vs-y-body-tune.html http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207295-egr-connector.html Fri, 20 Nov 2009 21:01:20 GMT I plan on wiring my WB through my EGR and I want it to look as nice as possible, I don't want it to look like someone just went in with a bunch of electrical tape and just started wraping wires together. I know it's gonna have to be a 5-way flat connetor. Does this connector look like it would work?

http://www.thewiringproject.co.uk/sh...ils.asp?id=499

I didn't know if I would have to buy the 5-way male and female and wire a new connector into the stock wiring for this set-up to work


If not, does anyone have any experience with this and know where I could get the connector?
Thanks ]]> 99LS6SS http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207295-egr-connector.html http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207111-shift-rpm.html Fri, 20 Nov 2009 05:02:44 GMT Guys I need some help here. I have read that you want to set the shifting to 200 rpm past peak hp but is this always true. I have a heavy(probably 4800lbs) 2003 Silverado and my tq is greater and flatter than my hp. So should I instead go by my tq numbers? Where should I set my shifting at based on... Guys I need some help here. I have read that you want to set the shifting to 200 rpm past peak hp but is this always true. I have a heavy(probably 4800lbs) 2003 Silverado and my tq is greater and flatter than my hp. So should I instead go by my tq numbers? Where should I set my shifting at based on the graph below.

Thanks for any advise.

]]> SRT10KLLR http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1207111-shift-rpm.html http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1206980-max-timing-ls1.html Thu, 19 Nov 2009 23:48:54 GMT What is the maximum timing allowable for a stock LS1 with LS6 intake and headers, everything else bone stock.... T, What is the maximum timing allowable for a stock LS1 with LS6 intake and headers, everything else bone stock....

T, ]]> TomM http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1206980-max-timing-ls1.html http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1206909-pcm.html Thu, 19 Nov 2009 19:58:53 GMT i just bought an ls1 from a 98 z28 are the pcms different on the 99 00 and up i just bought an ls1 from a 98 z28 are the pcms different on the 99 00 and up ]]> SScamaro4 http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1206909-pcm.html http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1206849-converting-a4-m6-tune.html Thu, 19 Nov 2009 16:42:19 GMT I've done a complete motor and tranny swap, using a 99 pcm which turned out to be for an A4 and I also installed the 1 bar OS in it. Is there a way to use one of the tunes in the HP tuners repository and change the VIN so that I have a full M6 tune? ]]> sssalah http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1206849-converting-a4-m6-tune.html http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1206776-p1221-reduced-eng-pwr-lights.html Thu, 19 Nov 2009 07:09:34 GMT I have a 2000 camaro 3.8L. So I start my car up and it throws an engine light (p1221) and reduced eng pwr light code. I can only drive my car up to 15-20mph and my tach will not rise above 2500rpm. After several hours later, both lights turned off and my car drove like normal. Any steps you guys... I have a 2000 camaro 3.8L. So I start my car up and it throws an engine light (p1221) and reduced eng pwr light code. I can only drive my car up to 15-20mph and my tach will not rise above 2500rpm. After several hours later, both lights turned off and my car drove like normal. Any steps you guys can suggest to troubleshoot/solve problem? Thanks ]]> Camaro2iDie http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1206776-p1221-reduced-eng-pwr-lights.html http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1206750-how-adjust-transmission-shift-firmness.html Thu, 19 Nov 2009 05:45:33 GMT i have hp tuners the pro version and was wondering if someone could give me some advice on how to adjust how the tranny shifts my 2-3 upshift has a weird delay in the shift and so does the 3-2 downshift if anyone can help me out it would be highly appreciated thanks i have hp tuners the pro version and was wondering if someone could give me some advice on how to adjust how the tranny shifts my 2-3 upshift has a weird delay in the shift and so does the 3-2 downshift if anyone can help me out it would be highly appreciated

thanks ]]> chevyforlife http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1206750-how-adjust-transmission-shift-firmness.html http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1206723-01-zo6-odd-idle-problem.html Thu, 19 Nov 2009 04:00:20 GMT A friend of mine has an 01 ZO6 and its stock except for exhaust and intake. We tweaked a few things on it for gas mileage but nothing major. The car suddenly decided when you press the clutch and are coasting to a stop, the car idles down to 500 rpms and sits there. Then, once you've come to a complete stop, raises up to where it's supposed to be idling. I know I've read about this before but I'll be damned if I can find it now. TIA. ]]> WS6 GreeN http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1206723-01-zo6-odd-idle-problem.html http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1206678-adjustable-fuel-regulator-tuning.html Thu, 19 Nov 2009 02:25:35 GMT Would an adjustable fuel preasure regulator make tuning a FI car easier? Especially with a 98? Thinking of installing STS on a 98 SS. THANKS!!! Would an adjustable fuel preasure regulator make tuning a FI car easier? Especially with a 98? Thinking of installing STS on a 98 SS. THANKS!!! ]]> zapp168 http://www.ls1tech.com/forums/pcm-diagnostics-tuning/1206678-adjustable-fuel-regulator-tuning.html