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Ok, I didn't see the fuel ratio thing in his post. 14+ is to high. He can take more timing changes once he brings it down into the 13 range. Probably run a lot of timing on 13.0:1 I'm with Chris, I think he shouldn't be playing with the timing until has the fuel down to a safer range.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
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Originally posted by warmonger:
... I think he shouldn't be playing with the timing until has the fuel down to a safer range.
That's like russian roulette with your engine. Get that mixture tightened down, then play with the advance so you have far less risk of damage to the engine.
Does this guy also work on wiring lights in his house with the wires live? Just a matter of time... 
Must be that jumbly-wumbly thing happening again.
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You are datalogging in 3rd or 4th right??? (4th is best by far)
Datalogging in 1st or 2nd is worthless. The results are too erratic and inconsistent because the rpm is climbing so fast.
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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Originally posted by DemonSVT:
You are datalogging in 3rd or 4th right??? (4th is best by far)
Datalogging in 1st or 2nd is worthless. The results are too erratic and inconsistent because the rpm is climbing so fast.
******gets out pen,takes note**********...interesting..i've been doing it in third
"Youth ages, immaturity is outgrown, ignorance can be educated, and drunkenness sobered, but STUPID lasts forever."-Aristophanes.
--93 pgt,headers,intake,borla=14.9 1/4mile
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Best as in you have more time for the fuel deliver system to settle down to a sort of steady state.  If you have a normal or slow car, third is probably fine. Try datalogging in 2nd gear, that's what my third gear feels like. I have to use 4th for detailed tuning.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
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'06 Mazda5 Touring, 5spd,MTX, Black
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Sorry I was in the mountains all weekend.
First, all pulls in 4th, of course. 
Second, the graph from this summer at sealevel shoes me at a solid 12:1 AFR. Very consistently so too. Without making any changes except to my location, my AFR shoots up to about 14:1. We havent made any changes to fuel, AFR, anything like that. The AFR also didnt seem to change with the tunes either. It was almost exactly the same each time.
I dont know why its so lean. I feel like it has to be related to altitude. At lower alt. it was so steady at 12:1. Now its steady at 14:1. Like I said, I havent touched a thing besides timing so its got to be something that the car isnt correcting on its own.
BTW, thanks for the help Mark. Feel free to step in!
I'll try to get some of the graphs scanned in tonight.
Last edited by KingpinSVT; 12/04/05 07:09 PM.
#4559 of 6535 born on Feb 17, 1998
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Here are some graphs: HP and TQ  HP and AFR (this isnt all the runs, just some of the last ones.)  Now here is the key to the next 3 graphs. Its all the same run with TQ and AFR, but its very detailed so its spread out over 3 pages. I have this for all 3 tunes, but this one is of 2 of the runs with my "stage 3" or most agressive tune (almost +5* timing)    Lastly, here is the graph of my SZ dyno, running much richer! 
#4559 of 6535 born on Feb 17, 1998
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Seems like the air at high altitude is lesss dense and the computer is putting in less fuel because of it.
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Right, but it should still equal out. The PCM *should* be doing it proportionally. Seems like it might be over compensating or something? Anyone want to see MAF counts?
#4559 of 6535 born on Feb 17, 1998
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Originally posted by KingpinSVT:
Sorry I was in the mountains all weekend.
First, all pulls in 4th, of course.
Second, the graph from this summer at sealevel shoes me at a solid 12:1 AFR. Very consistently so too. Without making any changes except to my location, my AFR shoots up to about 14:1. We havent made any changes to fuel, AFR, anything like that. The AFR also didnt seem to change with the tunes either. It was almost exactly the same each time.
I dont know why its so lean. I feel like it has to be related to altitude. At lower alt. it was so steady at 12:1. Now its steady at 14:1. Like I said, I havent touched a thing besides timing so its got to be something that the car isnt correcting on its own.
BTW, thanks for the help Mark. Feel free to step in!
I'll try to get some of the graphs scanned in tonight.
Did you recalibrate the sensor in each location before you climbed to altitude? If you mount the O2 sensor in the exhaust and then drive around without recalibration, things like air density will greatly affect it.
It balances the measured O2 against what it picks up in the atmosphere.
If outside pressure goes up and nothing else changes in the fuel ratio, and there is no calibration, then it will read more rich as the ratio of O2/O2 outside/inside is higher.
IF you lower the pressure then the O2/O2 outside to inside will be lower and read leaner.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
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