Since I don't have anything to datalog and trying to improve the performance on the street, I made this little setup on MS Excel to make thing easier.
Currently, the AFR are lower (more in the 10.6-10.5) @ 20psi in third gear, and getting in the 10.1-10.1 in fourth... This is my first issue... While someone nails it in 3rd ont he hightway, I watch the wideband, boost gauge and RPM. The major problem I have is that the SCT software doesn't work on the laptop we have. So we can't make modification on the fly.. We have to get home, do the modifications and then go back in the car... I'll figure something out...
Fuel: The top grid is the 'value', the bottom grid is the value in AFR.
As for the sprak, we got a base tune on a dyno. Didn't have time to play with that since we don't have a scangauge...
Spark
Tell me what you think. I got the .xls file if you want to do something similar but don't have time.
I don't even know what I'm looking at here. You did not mention a problem with the tune. If it's a lean condition. Use the "power enrichment above stoich" table to add some fuel where you need it.
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Every human being is ignorant, only on different subjects.
First grid on top are the values in the 'power enrichment over stoick'. The grid right under is the equivalent AFR (you know, the little equation they show). I tought it would be easier to work this way since I have an idea of what is an AFR of 11.78, and have totally no idea of what is a value of 0.0154)
the two grid below is a comparaison between the S2 wot sparck and the one we are running.
First grid on top are the values in the 'power enrichment over stoick'. The grid right under is the equivalent AFR (you know, the little equation they show). I tought it would be easier to work this way since I have an idea of what is an AFR of 11.78, and have totally no idea of what is a value of 0.0154)
the two grid below is a comparaison between the S2 wot sparck and the one we are running.
Just learn to read F/A, its not that hard to figure out.
.0154 is what is added to the stioch F/A ratio during WOT. F/A is just the reciprocal of A/F.
A/F of 14.7:1 = a F/A of (1 devided by 14.7) = .0680
If stoich is a F/A .0680, then add .0154 to it and you get a F/A of .0834 which is an A/F of.....1/.0834 = 11.99:1
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Quote: Originally Posted by Bell Intercoolers
Regardless of the [Thermal] efficiency, if too much pressure is lost, then the intercooler is either useless or can actually decrease performance...Corky Bell
Last edited by duster360 : 07-04-2008 at 09:07 PM.
This is exactly what I am doing but using Excel to make it easier to work with.
I am wondering how come there is a difference between the value entered in this table and what the wideband is reading. If I use the 0.0680 stoick value, I get a 12.1 AFR in my table. But my wideband is reading 11.5. Could it be because of the 'exhaust temp' scalar (as talked elsewhere on the forum) ? Also, when shifted in 4th gear, the car goes super rich (10.0). I'll be trying that tomorrow...
(I compared the wideband value with the one the dynoshop had, and they were reading the exact same thing. I'm not ready to say that it is a sensor difference)
I went and looked at a stock Map in Advantage and they have their stoich F/A at .0695.
Doing the math, dusty is right and the F/A should be .0680. If you do the math for .0695 the stoich is actually about 14.38:1 . I only have access to just one Map, the stock 04 that ends with AH, Im not sure if this this like that on other Maps.
Just thought it was a little odd. Im not sure if I should set my stoich to .0680 or leave it at .0695?
I made the changes for the 'exhaust temp' thing. The car still runs the same AFR, but I solved the problem we were having when shifting at WOT in fourth, the car doesn't run 10.0AFR in fourth ! Houray !
Last edited by SRT-What? : 07-07-2008 at 07:27 AM.
Just thought it was a little odd. Im not sure if I should set my stoich to .0680 or leave it at .0695?
Not a big deal imo. 14.7:1 is only the proper stioch at sea level any way. The O2 will run stioch at closed loop and your screwing with PE to get the A/F at WOT so what does the .3 difference really affect?
You can change it but then all the other temp, startup, accel,ect modifiers will be off a bit too.
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Your thought on my tuning setup
Linear Mode
