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Rank: ProTuner  Groups: ProTuner, Registered Users, Subscribers Joined: 5/20/2008 Posts: 24 |
AussieLS1evil wrote:AJ,
Howard is running a marine intake with 42 lb/h injectors......forgot to mention that as well.    I can see what you are talking about a Northstar with 8 Throttle Bodies.  |
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Rank: Administration  Groups: ForumAdmin, ProTuner, Registered Users, Subscribers Joined: 5/20/2008 Posts: 6 |
 Rev it up, Drop the clutch, See what happens..... |
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Rank: Administration Groups: ForumAdmin, ProTuner, Registered Users, Subscribers Joined: 5/20/2008 Posts: 6 |
 I'm not quite sure but it's fun...LOL Rev it up, Drop the clutch, See what happens..... |
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AJ,
Does the caddy ecm have any PE delay in the code?
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Rank: Administration Groups: ForumAdmin, ProTuner, Registered Users, Subscribers Joined: 5/20/2008 Posts: 6 |
Dtuned wrote:AJ,
Does the caddy ecm have any PE delay in the code?
Dtuned, There should be PE delay in the code and you can zero this out for no delay but what you must consider is that PE does'nt activate untill a certain TPS%. When you check out most tunes you will find that this is set OEM to 70% +. You can pull this down to 20% TPS to activate PE but as you can see with the above log the lean spike comes in with only 10% TPS. If you drop it any lower to activate it sooner you will be driving around on PE all the time. IMHO. Rev it up, Drop the clutch, See what happens..... |
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Rank: ProTuner  Groups: Joined: 5/20/2008 Posts: 1 |
Lol! All this talk about me and mine...and I didn't get an invite. Lol! Here's what I'm running...exactly. EFILive COS3 OLSD tune. PLX wideband...sensor is installed right next to the OEM narrow band. 98 K1500 4x4 Suburban 4L80E trany with the 7.4L converter Whipple SC No intercooler...I have one on the way. Trutrac rear Marine intake with Bosch 0 280 150 558 greentop injectors (no one seems to have the specs for these). Walbro 255 fuel pump Ahhh....what else... Restrictor removed from the TB. Elec fans Hydroboost 0411 PCM      Cheers
Howard |
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Oh...and if I give the throttle a quick tap....I can command a 19.6 lean tip in spike...at will. Cheers
Howard |
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Rank: ProTuner Groups: ProTuner, Registered Users, Subscribers Joined: 5/20/2008 Posts: 24 |
Initial Lean spike on a Closed throttle to WOT from a dead stop (17.1) The system goes a little lean on the 1-2 shift (13.6) This is the Lean Spike form the Nitrous jet opening (13.1) This is the Rich peak with the Nitrous on. (10.3) The bottle may have been getting weak It sure does look like my Initial Lean Spike is a shorter duration.
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Rank: ProTuner Groups: ProTuner, Registered Users, Subscribers Joined: 5/20/2008 Posts: 24 |
AussieLS1evil wrote: Ok I think I got it sorted...LoL...Thanks. As you can see from the log just on throttle tip in you can see the difference between commanded and actual AFR. You will be able to see that either side of the lean spike the AFR is quite accurate. How much have you played with the timing at this condition. It really looks like your timing drops. may be change it 2° and see if it has any effect on the Wide band AFR. The factory O2 is not picking up the change. I have had some argument about the PCM stating the AFR is X but it really Y. I am using a Zeitronix Wide Band controller. It has a Narrow Band out put. Maybe you could convert the system to Wide bands and the problem may go away |
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Rank: Administration Groups: ForumAdmin, ProTuner, Registered Users, Subscribers Joined: 5/20/2008 Posts: 6 |
Currently it runs open loop so it doesn't require feed back from o2's. It is being tuned with wideband thats pretty much on the money with commanded. Increasing timing at the lean spike induces real knock. No parameter adjustment so far has even looked like fixing the lean spike. It has been mentioned by a good friend of ours that it would be pcm knock check routine and it is supposed to be there. Then a Aussie calibrator has a different opinion.... It's been a great chat but don't you think! Rev it up, Drop the clutch, See what happens..... |
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Rank: Newbie  Groups: ForumAdmin, ProTuner, Registered Users, Subscribers Joined: 5/20/2008 Posts: 3 |
That still sounds like VE tables off. That is exactly what mine did when I messed with VE to experiment with it. Fatten up VE in that rpm/map range and see if it reduces it. hquick wrote:Oh...and if I give the throttle a quick tap....I can command a 19.6 lean tip in spike...at will. |
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Rank: ProTuner Groups: ProTuner, Registered Users, Subscribers Joined: 5/20/2008 Posts: 24 |
AussieLS1evil wrote:
It's been a great chat but don't you think!
I think Some day I think more than others Two quick things How about moving the MAP sensor closer to the T-Body? Like to the T-Body The other thing is I am under the impression that the LS1 MAF is a far superior to the other sensors used up until 2004. Am I correct? How about an LS1 MAF? Side Note: I think starting in 04 GM started using a "Digital MAF". Well that is what they told me at the training center. Kent Moore had to come out with a new signal generator to aid in diagnostics with it. |
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hello, just checking in, looking good so far
jay
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AJ, is that your foot in the bottom pic? That's really putting "your foot into it" !! LOL
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Aj, Yes I think ls1 MAF's are superior to older ones. The MAF translator for 3.8 GN's changed the industry. Heat killed the maf's quickly not to mention they would randomly just go bad.
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Rank: ProTuner Groups: Joined: 5/20/2008 Posts: 1 |
I was just thinking... I removed the little restrictor/cup thingy from the throttle blade in order to try and improve throttle response. I guess what this would do...or why GM put it there is so as I hit the pedal and the TB opens...the TPS will rise before I get any extra actual airflow. So..normally with the restrictor I would get more fuel via the TPS before getting a burst of air. Maybe I should try installing the spare 'stock' TB I have on the shelf. Cheers
Howard |
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Rank: ProTuner Groups: Joined: 5/20/2008 Posts: 1 |
Any more thoughts on this one guys? I've gone back to running OL MAF. Seems the MAF can compensate ALOT quicker for the sudden change of airflow on a throttle stab. It's made an enormous difference in that now I see 15.5 or so AFR on a throttle stab instead of 19.6+. Cheers
Howard |
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Rank: Administration  Groups: ForumAdmin, ProTuner, Registered Users, Subscribers Joined: 5/17/2008 Posts: 23 |
EMAC²® wrote:Welcome All !! This is test |
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