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So I did a lot of datalogging on the dyno today and noticed something interesting. I was doing this with my Xcal2 so that I can get my tunes finalized. Brenspeed gave me 3 conservative tunes first, then with my datalogging they are going to get it nailed down. The most agressive of the 3 tunes added almost 5 degrees of timing. I dont how much the other tunes added, but they werent as much.
Anyway, I started with the most agressive one because that was the one that was on my car when I got there. Everything looked OK, but I switched to the middle tune. Then the dyno operator noticed some choppiness in the powerband and said the knock sensor might be acting up. I decided to start logging the knock sensor advance, and noticed it was pulling up to 3 degrees in the middle of the powerband.
I then switched back to the more extreme tune, and the knock sensor didnt pull anything.
This doesnt make sense to me. Adding a little timing made the knock sensor retard 3* but adding more timing it didnt retard at all. Wouldnt you expect it to retard more?
Me confused 
Im off to work, but if you need more info just ask. I can send my excel files to anyone that wants to take a look at what Im talking about.
On a side note my TQ curve is flat as hell 
EDIT: My bad. The more aggressive tune retarded timing as well, just not as long or as frequently. Makes a bit more sense I guess.
Last edited by KingpinSVT; 12/02/05 07:29 PM.
#4559 of 6535 born on Feb 17, 1998
Black 1998.5 CSVT
FOR SALE [cleaning house]: SVT rear swaybar. Reasonable offer and its yours!
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Maybe the knock sensor is disable in the most aggressive tune?
Ryan
Trollin!
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We want base #'s! Mark
2000 Black CSVT
3.0L Hybrid - 206fwhp & 195fwtq
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could also be that with the bit more aggressive tune / timing, they may have added a bit more fuel to compensate for knock.
Just a thought.
I'll put holes in him!!
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Originally posted by Y2KSVT:
We want base #'s!
Mark
Should have them from SZ....i too wonder what kind of numbers the x-cal put out.
99 SE V6\5spd - 156 HP\157 TQ 15.166-90.84
Totaled 02/12/06
99 SVT # 1571 - 175 HP\153 TQ 14.999-91.88
Born 3/24/99 Reborn 3/18/06
Pietenpol Racing Technologies project vehicle
90 Festiva L 5spd, Blue(not for long), 103k
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Well the numbers are kind of sad, actually. I was on a Dyno Dynamics dyno, which reads incredibly low. The shop that owns it calls it the heart breaker. However, that dyno brand is amazing in what you can do on it and with it. I didnt go in there today to get numbers, I was there for data collection. FWIW, last time I dyno'd on the Dyno Dynamics I pulled 161whp. 2 months later (0 changes to the car), I pulled 175whp on a Dyno Jet. Today I dyno'd 163whp. It shows me being fairly lean, same as the first time I pulled up here with no tuning. In Ft. Wayne I was really fat with no tuning. Now Im not at all rich, pretty much at 14-14.5 the whole time. I guess the car isnt compensating as much as it should be for altitude? We have made 0 changes to AFR so far, only timing. The reason I didnt get on a Dyno Jet is because its a hour drive. This one is 10 min away, plus I know the operator and he gives me discounts on pulls. I was there for an hour and a half and they only lightened my wallet by $56. When I get my "real" tuning done Im going to a Dyno Jet for final numbers so I dont have to wipe away the tears when I leave.  Unfortunately, we have some work ahead of us with my car. And after all of that, Ill be returning to sea level in 5 months and have to do this all over again. Oh well, gotta pay to play!
#4559 of 6535 born on Feb 17, 1998
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Originally posted by RTStabler51:
Maybe the knock sensor is disable in the most aggressive tune?
Sounds like a good guess, but here's another:
The aggressive tune just adds a little more fuel than the others and keeps the combustion temps down to resist knock.
Or both possibly. Hell, he aggessive one works just use it.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
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Quote:
Now Im not at all rich, pretty much at 14-14.5 the whole time
That right there is most of your problem.
2001 Lincoln LS8
1994 Lexus GS300
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Originally posted by Keyser:
Quote:
Now Im not at all rich, pretty much at 14-14.5 the whole time
That right there is most of your problem.
shouldnt he be closer to 12.5?
"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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Originally posted by Keyser:
Quote:
Now Im not at all rich, pretty much at 14-14.5 the whole time
That right there is most of your problem.
And like he said, NO changes were made to AFR. He was wanting to make some changes to timing to see how the car would react at high altitude with some timing thrown at it. Talking with Brent @ Brenspeed, they wanted to be conservative, and have room to play. I'm sure Brent will be sending him some new files for adjusted AFR with possibly some more timing.
But yes, he will be able to move up to the 13.0 range(give or take a couple of tenths) and be safe, and also gain some power.
Sorry to answer that for you Chris, but I don't know if everyone understands your circumstances with altitude change every 6 months 
Mark
2000 Black CSVT
3.0L Hybrid - 206fwhp & 195fwtq
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