wondering about this tune???

[MSiska]

Coming back from the Fest, I had to fill up four times. Normally, I can make it on two tanks coming from BG. My dic was showing 23.4mpg Avg. Down by 7-8mpg.

I had the tune checked by EFI-Live. Found out my timing is now 40 degrees from idle up to 4,000rpm. Anyway here is what the tables were:
Cell# Bank 1 Bank 2
0 21.09% 20.51%
1 21.09% 20.51%
2 21.09% 20.51%
3 21.09% 20.51%
4 21.09% 20.51%
5 21.09% 20.51%
6 21.09% 20.51%
7 21.09% 20.51%
8 21.09% 20.51%
9 21.09% 20.51%
10 21.09% 20.51%
11 21.09% 20.51%
12 21.09% 20.51%
13 21.09% 20.51%
14 21.09% 20.51%
15 21.09% 20.51%
16 12.70% 10.74%
17 12.70% 10.74%
18 12.70% 10.74%
19 12.70% 10.74%
20 12.70% 10.74%
21 25.00% 25.00%
22 21.09% 20.51%

I do have 30# injectors and I believe the HP Tuner program installed was set up for this.
Does anybody have any thoughts on this fuel cell tune? I really am a layman when it comes to this.
The other thing is the car runs like a bat out of hell from idle to 6800rpms.
I'm just confused I guess.

[wvphoto]

i'm not sure of the tune....



can you hum a few bars.. ?



i think you kept waking me up on the way home.. stopping for gas..

thanks

[Gman2002Z06]

Fuel Cell Tune??? I have HP Tuners and have nothing in my programming that resembles those numbers...

Not sure what the data is that you posted...What are the cell #'s and what are the %'s you listed for each bank for the cells...

If those are your cruise Ltrims...You need to make big changes to your MAF table...Those should be near zero to slightly negative...

Once you get the cruise Ltrims dialed in, then you can adjust your PE table for your WOT A/F mix...

Peace...Gman

[case2307]

I think timing should be somewhere between 18 and 21 advanced.

[Gman2002Z06]

Timing with stock programming should be 22 deg. at WOT...

AT part throttle it is very possible to see 40 deg. of advance...

Depends on where in the timing table his MAF readings are sending him...

I think whatever tuning he has is way off...

Need to hear from wvphoto to get more info. on what is going on data wise with his programming...

Peace...Gman

[WayneE]

Do you have before/after ET/MPH or dyno/AF #s? You say it runs like a bat out of hell, is that just a butt-dyno reading?

[MSiska]

Originally Posted by WayneE

Do you have before/after ET/MPH or dyno/AF #s? You say it runs like a bat out of hell, is that just a butt-dyno reading?

Wayne...at Beech Bend I ran a best of 12.41@115, about 90 degrees with a DA of about +2000. At ETown in June under similiar conditions before the tune, my best was a 12.70@111. I'm thinking of replacing the injectors with stock.

[WayneE]

Same short times between those runs?

[ZO6/Les]

Well here is my .02, other opinions will vary.

1. If you have SVO 30# injectors they are too long for these motors and rub against the fuel rail, restricting flow and causing the injector to overheat. I grenaded a piston with them, will never do it again. This would likely only show itself if you road race the car though.

2. I DO NOT believe in hand held tuning devices. I recall you said in a post a few weeks back that this car was falling over in the 1/4 mile since the tune, now your mileage stinks - there is a connection. Likely the hand held is using the same pulse rate as if it had stock injectors - which would make you run pig rich. If that is not the case and you go back to stock injectors and change nothing else you risk running lean which can make bigger problems.

So what would I do if I were you? Take the car to a good tuner that will dyno tune it with LS1Edit. Taking a shotgun approach by swapping injectors etc. is asking for trouble.

Good Luck.

Les

Originally Posted by MSiska

Coming back from the Fest, I had to fill up four times. Normally, I can make it on two tanks coming from BG. My dic was showing 23.4mpg Avg. Down by 7-8mpg.

I had the tune checked by EFI-Live. Found out my timing is now 40 degrees from idle up to 4,000rpm. Anyway here is what the tables were:
Cell# Bank 1 Bank 2
0 21.09% 20.51%
1 21.09% 20.51%
2 21.09% 20.51%
3 21.09% 20.51%
4 21.09% 20.51%
5 21.09% 20.51%
6 21.09% 20.51%
7 21.09% 20.51%
8 21.09% 20.51%
9 21.09% 20.51%
10 21.09% 20.51%
11 21.09% 20.51%
12 21.09% 20.51%
13 21.09% 20.51%
14 21.09% 20.51%
15 21.09% 20.51%
16 12.70% 10.74%
17 12.70% 10.74%
18 12.70% 10.74%
19 12.70% 10.74%
20 12.70% 10.74%
21 25.00% 25.00%
22 21.09% 20.51%

I do have 30# injectors and I believe the HP Tuner program installed was set up for this.
Does anybody have any thoughts on this fuel cell tune? I really am a layman when it comes to this.
The other thing is the car runs like a bat out of hell from idle to 6800rpms.
I'm just confused I guess.

[MSiska]

Originally Posted by ZO6/Les

Well here is my .02, other opinions will vary.


2. I DO NOT believe in hand held tuning devices. I recall you said in a post a few weeks back that this car was falling over in the 1/4 mile since the tune, now your mileage stinks - there is a connection. Likely the hand held is using the same pulse rate as if it had stock injectors - which would make you run pig rich. If that is not the case and you go back to stock injectors and change nothing else you risk running lean which can make bigger problems.

So what would I do if I were you? Take the car to a good tuner that will dyno tune it with LS1Edit. Taking a shotgun approach by swapping injectors etc. is asking for trouble.

Good Luck.

Les

Actually, before the tune it was falling on it's face about 4800rpm's with drag radials. With my BFG Kd's, it accelerates normally in all gears.
And I probably will do your last suggestion. Thanks Les!

[MSiska]

Originally Posted by WayneE

Same short times between those runs?

Same short times-1.90/2.0

[FRC Tom]

I'm sure your LTs are on the positive side in closed loop, in turn when you go in to open loop (WOT) the pcm looks at these and dumps more fuel.
I went from 10.6 mpg with a previous tune to 17.5 after tuning my car.
I would first get the injector flow rate set then step into the maf tables.
I just fixed a '01 Z06, a '99 H&C FRC, and a T/A that was having the same problem and he also has a reverse split 111 LSA cam.
If your injector flow rates have not been changed from stock the pcm will dump more fuel. The lower the IFR table is set the pcm thinks the inj. are larger and will increase the flow.

[dmtnt]

Originally Posted by ZO6/Les

Well here is my .02, other opinions will vary.

1. If you have SVO 30# injectors they are too long for these motors and rub against the fuel rail, restricting flow and causing the injector to overheat. I grenaded a piston with them, will never do it again. This would likely only show itself if you road race the car though.

Les,

Before installing my SVO's I researched this extensively based on your experiences. You are the only person to ever report this problem that I could find. Is it possible you got an improperly made set?? If the height impeded flow, wouldn't this show up immediately, especially under hard runs and/or WOT?? Not doubting you, but strange how so many are running these injectors with no problems. I'm concerned because I track the car as well (road race), however what about road racing conditions would differ from WOT/dyno/quarter mile runs as far as the injectors were concerned?

[S-TEE]

Mike,

Is this with the tune done at the Fest? If so, maybe you should give Greg a call... ...I think he had several tunes pre-written and stored on that laptop of his, possible you have an incorrect one?

Scott

[FRC Tom]