Fun times at the track last night...

[The_Jerbel]

Here's a vid of a pass I made last night. I was running a very conservative base map for software because I just barely threw the water/meth kit in the car yesterday afternoon, so I didn't have time to tune it at all and I didn't want to do any damage to the car. Track is at 4000ft elevation, for more details check out the caption...
12.7 @ 109

[RolledMySTi]

You need a better camera man. I look forward to seeing what a tune will due to the times.

[ThirdStrike]

109 for a stage 3 car is not too fast eh?

[Daft]

109 for a stage 3 car is not too fast eh?

He's at 4000 Ft. above sea level. Ambient air pressure drops .5Psi for every 1000Ft. above sea level. Less dense air equals less actual oxygen to burn and thus less HP. Yada, yada, yada.

[The_Jerbel]

^^Thank you

The track has the reputation of being the 2nd slowest track in North America for 2 reasons mainly: It's the 2nd highest (the only one higher is in Colorado), and the prep work is horrible. As you can tell, I had a hard time getting traction, and kept tweaking my launching technique because there was so much rubber at the start line that I kept spinning my wheels. My 60' were 1.8-1.9. This was the opening night for the season, we'll see how I do after a good tune and some modification to the launch.
My highest trap was 113.

For reference, an '07 Carrera 4S ran a 15.0, a modded 300ZX fairlady z ran a 14.5, a SC Cobra ran a 13.7, and a sprayed busa ran 11.1.

[jasonsowers]

Bandemere is in Colorado. Good time dude!

[Matt@JHM]

Nice times considering the elevation and track conditions, keep it up.

[sCeRaXn]

Congrats on the times. I guess some people dont understand how much elevation can hurt you...and 4000ft is like nosebleed high lol. Consdering the elevation and the fact that you were on a conservative basemap, id say this was a really respectable time.

[ThirdStrike]

my bad.
what did the s/c z06 trap?

[ThirdStrike]

He's at 4000 Ft. above sea level. Ambient air pressure drops .5Psi for every 1000Ft. above sea level. Less dense air equals less actual oxygen to burn and thus less HP. Yada, yada, yada.

op; were you seeing less than normal boost levels?
im pretty sure you get the same boost at elevation as you would at sealevel...

[BastardS4]

sigh....

[bob12312357]

^^Thank you
and a sprayed busa ran 11.1.

Holy Bejusus batman. Altitude or not,11.1 better have been a messed up launch, then the bike stalled out from running outta gas so he had to run grab a gas can,top up and continue his run with no pause on the timer for all the complications and not averages for a stretched and sprayed BUS.

[///M3 TO S4]

109 for a stage 3 car is not too fast eh?

op; were you seeing less than normal boost levels?
im pretty sure you get the same boost at elevation as you would at sealevel...

you always say the smartest things in all your threads....


Great runs jerbel for such a shitty track/conditions.....a stock s4 would be in the high 15's there I bet....

[ThirdStrike]

you always say the smartest things in all your threads....

wasnt a statement it was a question..
being that i trapped 107 on a stage 2 tune with k03's id say 109 is not that fast for a vast stage3... but im wrong a lot.
requested boost = actual boost at any elevation if your car is running right... but you guys are right less dense air = less hp.
im /done

[jibberjive]

^^Thank you

The track has the reputation of being the 2nd slowest track in North America for 2 reasons mainly: It's the 2nd highest (the only one higher is in Colorado), and the prep work is horrible. As you can tell, I had a hard time getting traction, and kept tweaking my launching technique because there was so much rubber at the start line that I kept spinning my wheels. My 60' were 1.8-1.9. This was the opening night for the season, we'll see how I do after a good tune and some modification to the launch.
My highest trap was 113.

For reference, an '07 Carrera 4S ran a 15.0, a modded 300ZX fairlady z ran a 14.5, a SC Cobra ran a 13.7, and a sprayed busa ran 11.1.

What's the elevation? We've got Rockymountain Raceway here that is like 4300ft. IIRC. On friday a viper ran like consistient 13.5's

[Daft]

op; were you seeing less than normal boost levels?
im pretty sure you get the same boost at elevation as you would at sealevel...

Psia = ambient air pressure.
Psig = gauge pressure.

Lower ambient air pressure (Psia) means less O2 concentration. Boost (Psig) should be the same since the ECU is requesting whatever the program says. Therefore Psig would not go lower than the program asks for. If it were very cold (like winter), then you could possibly see less boost since O2 concentrations are higher. However this is assuming that the N75 is controlling boost. A MBC cannot compensate for air density changes. The N75 can be regulated based on the MAF readings.

My explination about ambient air pressure is only to relate to O2 in the ambient air and thus the lower amount of O2 to mix with fuel entering the combustion chamber.

O2 is the oxidizer for the fuel to ignite. Less oxidizer results in less powerful combustion. Less powerful combustion results in less force against the pistons.

[ThirdStrike]

Psia = ambient air pressure.
Psig = gauge pressure.

Lower ambient air pressure (Psia) means less O2 concentration. Boost (Psig) should be the same since the ECU is requesting whatever the program says. Therefore Psig would not go lower than the program asks for. If it were very cold (like winter), then you could possibly see less boost since O2 concentrations are higher. However this is assuming that the N75 is controlling boost. A MBC cannot compensate for air density changes. The N75 can be regulated based on the MAF readings.

My explination about ambient air pressure is only to relate to O2 in the ambient air and thus the lower amount of O2 to mix with fuel entering the combustion chamber.

O2 is the oxidizer for the fuel to ignite. Less oxidizer results in less powerful combustion. Less powerful combustion results in less force against the pistons.

as the same goes with hot air. i know.
thanks
/done again

[The_Jerbel]

my bad.
what did the s/c z06 trap?

The SC Z06 wasn't there that night, so I don't know.

[The_Jerbel]

op; were you seeing less than normal boost levels?
im pretty sure you get the same boost at elevation as you would at sealevel...

I can only run about 23 psi spike and taper to ~20psi before the IAT's get too hot because the turbos are compressing the air more than normal to get that pressure at such high altitude.

Turbos have to work harder to put out the same pressure at high altitude.

[The_Jerbel]

you always say the smartest things in all your threads....


Great runs jerbel for such a shitty track/conditions.....a stock s4 would be in the high 15's there I bet....

When I was stage 2 I was running a consistent 15.0 on that track.

[The_Jerbel]

Psia = ambient air pressure.
Psig = gauge pressure.

Lower ambient air pressure (Psia) means less O2 concentration. Boost (Psig) should be the same since the ECU is requesting whatever the program says. Therefore Psig would not go lower than the program asks for. If it were very cold (like winter), then you could possibly see less boost since O2 concentrations are higher. However this is assuming that the N75 is controlling boost. A MBC cannot compensate for air density changes. The N75 can be regulated based on the MAF readings.

My explination about ambient air pressure is only to relate to O2 in the ambient air and thus the lower amount of O2 to mix with fuel entering the combustion chamber.

O2 is the oxidizer for the fuel to ignite. Less oxidizer results in less powerful combustion. Less powerful combustion results in less force against the pistons.

Just for reference, in the dead of winter, I see roughly 250g/s of airflow, in the summer heat, I'm running about 230g/s. So the car typically runs more boost in the winter and less in the summer for that reason.

[///M3 TO S4]

wasnt a statement it was a question..
being that i trapped 107 on a stage 2 tune with k03's id say 109 is not that fast for a vast stage3... but im wrong a lot.
requested boost = actual boost at any elevation if your car is running right... but you guys are right less dense air = less hp.
im /done

Did you see the explanation why he only trapped 109? He said it like....3 times.

[m3ands4]

i ran a 12.6 at 108 here in michigan with a stage 2+

[///M3 TO S4]

i ran a 12.6 at 108 here in michigan with a stage 2+

neat-o guy.....why would you post that here?

[BastardS4]

my cats breath smells like cat food.

[The_Jerbel]

i ran a 12.6 at 108 here in michigan with a stage 2+

Piggie and I have been cursing this high altitude and our crappy gas here. If ONLY I was in Michigan. They recently dyno'd a car at VAST in Michigan with a setup similar to mine, except that the car they used had a stock airbox, I've got full RS4 air intake components up to the y-pipe. The car was running a stock tune, only hitting 21 psi and holding that to redline. It dyno'd ~410whp. THIS IS IN MICHIGAN, much much closer to sea level than Calgary. That car might be doing 370 or so here.

[Sniper512]

Bring your stage2+ to Calgary and see how it does. Calgarys track is a heartbreaker for sure STIs stock can bearly break into the 14s lol. Lots run 15s.

[The_Jerbel]

^^2nd. I'll repost this just to remind some people....

For reference, an '07 Carrera 4S ran a 15.0, a modded 300ZX fairlady z ran a 14.5, a SC Cobra ran a 13.7, and a sprayed busa ran 11.1

[JackalS4]

Holy elevation impact, Batman!

[The_Jerbel]

^^that and a crappy, unmaintained track surface...

[///M3 TO S4]

jesus...I just realized that that tool m3ands4 username is WAYYYYY too much much like mine....people are going to think i'm him now


EDIT: HOLY.....FUCKING.....SHIT!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!! IT'S SPOOLINGGT2871!!!!!!!!! BWHAHAHAHAHAHAHAHHAHA THATS WHO THAT IS!!!!!!!!!!!!!!1111!!!1111

[The_Jerbel]

i ran a 12.6 at 108 here in michigan with a stage 2+

Time slip? thanks

[///M3 TO S4]

Time slip? thanks

bro, check out the thread I just made.....lol this is going to get good...

[Audone]

To back Jordan up on this... with my APR stage 3 I ran a 13.1 @ 111 with a 2.2...and a split F-hose on my race program

and my Apr Stage 3+ A4 ran a 13.9 @ 103 w/ 2.0 (yeah, I suck at launching)

[The_Jerbel]

Mark, were those runs done on race gas? You mentioned the race program, what fuel were you running?

[Audone]

The S4 run was on race gas.... A4 was 94 octane.

[BamfiNogaroS4]

Bandemere is in Colorado. Good time dude!

If you get into the 13s here you have a pretty fast car lol I think its a little over 5800ft [O_O]

[The_Jerbel]

The S4 run was on race gas.... A4 was 94 octane.

Oh ok, I was just curious because my car used to walk away from yours pretty hard when you had the torn boot and I was on a slower tune. I did these runs on pump and I would really like to see what I can run on race gas with a good tune.

[Audone]

From what ive read.. 93 plus Meth would be close to a regular race gas program... and that appears to be true with those runs. Be interesting to see how they compare if I had Race and you did Meth, or when my Meth kit arrives!! hint hint...

[The_Jerbel]

I'm working on it! haha

I'd like to run race gas with the meth kit and advance the hell out of the timing...