Pettit Super Charger Owners
07-02-2008, 09:02 PM
#2476
Hey munche, expand the loaded part and take screenshots with the bar at different positions, and then overlay the screenshots if you can. If you can't do that you're better off exporting to excel and taking a screenshot of the spreadsheet.
The graph has no scale marks; it's meant to be navigated through. When he moves that line on the graph the numbers at the top of that line change.
The graph has no scale marks; it's meant to be navigated through. When he moves that line on the graph the numbers at the top of that line change.
07-02-2008, 09:04 PM
#2477
"MuNcH-E"
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07-02-2008, 09:08 PM
#2478
"MuNcH-E"
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07-02-2008, 09:10 PM
#2479
"MuNcH-E"
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Hey munche, expand the loaded part and take screenshots with the bar at different positions, and then overlay the screenshots if you can. If you can't do that you're better off exporting to excel and taking a screenshot of the spreadsheet.
The graph has no scale marks; it's meant to be navigated through. When he moves that line on the graph the numbers at the top of that line change.
The graph has no scale marks; it's meant to be navigated through. When he moves that line on the graph the numbers at the top of that line change.
Jeff has the excel file of this run
07-02-2008, 09:15 PM
#2481
Lets say his AF was 12.3:1 (.83 lambda for gas) without the meth (that is what he said it was in the post just before yours).
Now he turns on the meth/H2O (forget the nitro for a minute) and the AF is 12.8:1 (.87 lambda for gas).
What is his actual lambda?
Well, lets say for shots & goggles that he is flowing 35 pounds of air with that SC.
That means that the 12.3:1 AF is 2.8 pounds of gas per minute.
Now, lets say that the nitro/H2O he is injecting is 15% of his liquid volume (at a 40% mix).
So, on top of the 2.8 pounds of gas, he is now injecting about .2 pounds of meth with a stoich ratio of 6.7:1 (compared to gas at 14.7:1).
Do you see where this is going?
This doesn't even take into account the H2O, which is not combustible.
Then there is the nitro which, besides being immiscible and therefore of a indeterminable ratio, has a stoich ratio of 1.7:1.
The long and short - you can't tune for AF when the spray is on. Its meaningless.
07-03-2008, 11:39 AM
#2494
Pettit fangurl <3
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Phil - im letting the cat outta the bag...i do my roots!! 
i will never have gray showing..its against my religion
for wheels set up, this is what im running....
with stock shocks and tein s techs:
Volks GT-Fs
19x8.5 +33 245/35/19 toyo T1Rs up front
19X9.5 +36 275/30/19 toyo T1Rs in the rear
with no rubbing
i will never have gray showing..its against my religionfor wheels set up, this is what im running....
with stock shocks and tein s techs:
Volks GT-Fs
19x8.5 +33 245/35/19 toyo T1Rs up front
19X9.5 +36 275/30/19 toyo T1Rs in the rear
with no rubbing
07-03-2008, 01:24 PM
#2496
That's only because you don't push the car.
A 9.5" rim with a +36mm offset is sticking WAAAAY out (and you can tell from your pics that's the case).
A +42mm minimum offset (and a 1.2°+ camber) is needed to keep that tire from rubbing in the back under hard cornering.
I run 275/30 on 9.5" 19s with a +42mm offset (with 1.7° of camber) and they just make it under on track days with lightly rolled arches.
There are still places on the plastic where the tire touches.
07-03-2008, 01:48 PM
#2497
I'm running the enkei specials (18x9.5 +45) with 275x35s. I clear in the rear by about a paper's thickness. If my lining pops off the clip at the very corner and sticks out maybe 1/8" where you can push on it and it moves just enough so that you know it's not being pulled back by the clip, it hits the tire and wears through. I'm not sure how much camber I'm running as it was already enough to clear the tires.
On the nitromethane lambda discussion - did you change your tune between mixtures anticipating the added fuel or did you just have varying conditions that produced the different AFRs? I've read threads on other boards of people running a lot of methanol injection as a supplemental fuel source but the AFRs they shoot for are a weighted averaged based on what they run and generally way south of 12. Hmmmm. If you ran out of meth, that 12.8 might get up over 13.
On the nitromethane lambda discussion - did you change your tune between mixtures anticipating the added fuel or did you just have varying conditions that produced the different AFRs? I've read threads on other boards of people running a lot of methanol injection as a supplemental fuel source but the AFRs they shoot for are a weighted averaged based on what they run and generally way south of 12. Hmmmm. If you ran out of meth, that 12.8 might get up over 13.
07-03-2008, 02:00 PM
#2498
"MuNcH-E"
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The last run I did was with out the methanol and it was 12.3 I posted the screen shot. I disconnected the pump made sure the tank was empty and did some runs to make sure no meth was left in the system.
07-03-2008, 02:01 PM
#2499
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???
That's only because you don't push the car.
A 9.5" rim with a +36mm offset is sticking WAAAAY out (and you can tell from your pics that's the case).
A +42mm minimum offset (and a 1.2°+ camber) is needed to keep that tire from rubbing in the back under hard cornering.
I run 275/30 on 9.5" 19s with a +42mm offset (with 1.7° of camber) and they just make it under on track days with lightly rolled arches.
There are still places on the plastic where the tire touches.
That's only because you don't push the car.
A 9.5" rim with a +36mm offset is sticking WAAAAY out (and you can tell from your pics that's the case).
A +42mm minimum offset (and a 1.2°+ camber) is needed to keep that tire from rubbing in the back under hard cornering.
I run 275/30 on 9.5" 19s with a +42mm offset (with 1.7° of camber) and they just make it under on track days with lightly rolled arches.
There are still places on the plastic where the tire touches.
and granted, i dont track my car but i do push it from time to time on twisties etc
havent had a problem yet...
