ISF-88

I just recently moved back home and my home city's elevation is at 75ft asl. Where I moved from I was at 3300 ft asl. Alot of friends told me I'd do quicker times here due to closer at sea level but I was skeptical about it. So I tried out my Gtech Pro SS meter and did one quick 0-60 run tonite. I was shocked and pulled a 4.47 0-60 with no launch just stomped and go When I was at 3300 ft asl my quickest 0-60 run was 4.57 with tq brake launch and 4.64 without launch. That's almost 2 tenths quicker being closer to sea level. Also take note I pulled the 4.57 run when it was still cold out at 1 degrees calcius conditions and I pulled a 4.47 run in the summer at 16 degrees calcius conditions. I'm pretty sure I can shave a tenth off and get into the 4.3s with a proper launch. Anyhow now I do believe that being closer to sea level does make a diff in power. I didn't get to try out a 1/4 mile run but I will once I find a safe place to do it. Stay tuned.

ISFer

iTrader: (2)

respectable times whether at 3300 or asl. I'm guessing the denser air asl is what has a positive effect on the times.
C.

06isDriver

Dont worry, it doesnt need you to believe in it for it to have always been true. Of course denser air will pack more punch. What are the ingredients for fire? OXYGEN, heat, and fuel.

Its only controlled fire going on in your engine. More oxygen, more fuel, more fire.

ISF-88

Ya that's what my friends were telling me about the dense air, more fuel etc. I also just checked my tire pressure and I was at 40psi on all four tires. I lowered it down to 34 all around. I'll lower the rears a bit more and try another run again. I think I might be able to get it closer to 4.2 0-60 maybe

ISF-88

Well I finally got to try a 1/4 mile run couple nights ago and this is my comparison at current home city's +75ft amsl vs +3557ft amsl.


This was my quickest run I did last year. Run was done where I use to live and was done with a 1700rpm tq brake launch and on OEM Michellin PS2 tires.

5 degrees C / 41 degrees F clear night
Elevation AMSL +3557 ft
roads were smooth surface and dry

60' 2.158
0-60 4.586
330' 5.652
1/8 mile 8.501@89.01 mph
1000' 10.914
1/4 12.931@112.31 mph


My new results at my current home city. Here I could not get any traction on my new set of rubber...I tried 1500rpm launches but just couldn't hook properly so here I just did it w/o a launch. Also I didn't just mash on the gas as I still spun the tires so I just floored it just before the last click behind the pedal then once I hooked I floored it like I stole the car:P Run was done on Continental Extreme Contact DW tires with only 250km on them.

14 degrees C / 57 degrees F
Elevation AMSL +75 ft
Dry and clean surface roads

60' 2.100
0-60 4.450
330' 5.547
1/8 mile 8.381@88.73mph
1000' 10.808
1/4 mile 12.847@111mph


Both of these runs were done with Sport Mode on, Manual Paddle shift mode, VAC/TRAC fully off. Also had 1/2 tank of gas and tire pressure was not lowered. 36 psi all 4 corners.

I am confident enough to shave 1-2 more tenths off my 1/4 mile once my tires are fully broken in, less gas in the tank, lower tire pressure and get a proper launch off. In the end though I can see that I'm definitely running faster times here at lower elevation

06isDriver

I know that the is350 is MUCH faster in 1/4 mile time with sport mode OFF. We found that sport mode was shifting about 200 rpms too soon and really hampering the 1/4 mile times.

Also, I dont think you will ever be able to shift as consistently as the car can in auto.

In my is350, I do the peddle dance to turn my traction control all the way off (06 model), leave ect in NORMAL mode, spin the tires to get the grit off (no smoke), rev it to about 1800 and let 'er rip.

I'd bet thats what you need to do too.

lobuxracer

iTrader: (2)

No. The 350 and the F are completely different in this regard. The F is quickest and fastest in manual mode with the driver shifting. None of the other modes have been found to be as quick. Turning off the stability controls is unnecessary for quick acceleration unless traction is poor. You just need to kill the traction control. Pedal dance in the F kills everything including the electronic limited slip.

I've owned both cars and launched both cars. They're very different.

caymandive

iTrader: (2)

You are absolutely correct about the IS350, but the IS-F is optimized completely different at the drag strip. If left in auto mode, the IS-F will not have the direct shift that it does in manual mode. When the F is in manual mode, the torque converter locks up from 2nd gear and up allowing very fast shifts giving you that quicker time. The downside to this is you have to manually shift and hitting it just right every time takes practice.

ISF-88

Yup that is correct that using the paddleshifts in the F will be way faster then leaving it in auto mode. How I know cuz I've done a test in auto mode but not on purpose as I left it in auto by accident because I forgot to place it back into manual after reving it in nuetral prepping a tq brake launch. Anyhow when I realized I was still in auto I decided to just let it go and I pulled a 4.8 0-60 and a 13.2 1/4 mile....So compare with my other runs that were in manual paddeshift mode.

06isDriver

I stand corrected, good to know for when I buy my used isf