Sub 2.0 60 feet times
11-07-07, 09:18 AM
#31
^^^ I do the heater thing as well. It won't reduce coolant temp below the "normal" operating temp, but it will help keep it from going above it. I also try to keep the coolant flowing well by keeping the engine RPMs above 2K while sitting, and I manually select 1st or 2nd gear while driving back to grid. Otherwise the coolant temp can quickly climb 30+ degrees.
11-07-07, 10:32 AM
#32
11-07-07, 10:37 AM
#34
11-07-07, 10:49 AM
#35
If the coolant is cool, then the engine is also cool. When the engine is shut off, the coolant quits flowing, so everything gets heat soaked. The ECU uses the temperature of the coolant as one of the factors in determining fuel mixture and ignition timing. The hotter the coolant is, the less agressive the ECU will be.
11-07-07, 10:53 AM
#37
If the coolant is cool, then the engine is also cool. When the engine is shut off, the coolant quits flowing, so everything gets heat soaked. The ECU uses the temperature of the coolant as one of the factors in determining fuel mixture and ignition timing. The hotter the coolant is, the less agressive the ECU will be.
11-07-07, 11:05 AM
#38
I do leave the engine idle while waiting in the staging lanes because I still find it troublesome disabling the traction control. I do however crank the heat up, prop the engine hood and stand outside the car until our lane starts moving. If I had an 07 model I'd just leave the hood up and the engine off with the A/C fans blowing if possible.
11-07-07, 11:12 AM
#39
I have seen people put ice down all kinds of stuff at autocrosses, and I've heard of people icing down their fuel jugs at drag strips. I think that is just too over the top though. I just do whatever I can to NOT idle. I'll either shut it off if I think it's going to be more than 10 minutes, or keep the revs up with the heater on.
11-07-07, 11:47 AM
#40
11 Second Club
Thread Starter
Oh yeah, you may have addressed this, but do you run your street tires through the water and brake torque them before you run to heat them up and get the dirt off? I typically avoid the water, but do spin them a bit. Not sure how much of a difference the heat makes on regular street tires???
At any rate, thanks a bunch for the info!
At any rate, thanks a bunch for the info!
With regards to the heater and other accessories. I've got them all off the whole time. Like I said, I used to make a big deal about keeping the engine cool and opening the hood and turning the engine off, but being an 06, VDIM disable is a pain so I'd just rather leave it on. Last Sunday, the car didn't have much of a chance to idle at all. I'd run, cruise 30 mph back to the start and wait 1 minute stage and run again and again.
Maybe our IS350's aren't as sensitive as the old big block muscle cars/drag cars? Honestly, I'm just a toothdoc - I'm not a mechanic or drag racer specialist.
However, if it doesn't rain this Sunday, I'll do the same thing but for the 2nd half of my runs, I'll try 28 PSI just out of curiosity.
11-09-07, 10:19 AM
#41
Any idea how many tenths a full tank of gas may add? I just filed up before the prices went up, now I learn the density altitude is supposed to be at like zero Saturday!? 
11-09-07, 10:40 AM
#42
I think it would be less than a tenth. I'm basing this on the fact that my times only improved by .157 seconds when I removed my front seat and used R compound tires. I'm sure the R compound tires easily account for half of that difference. The front seat weighs about as much as 9 gallons of gas.
11-09-07, 10:50 AM
#43
I think it would be less than a tenth. I'm basing this on the fact that my times only improved by .157 seconds when I removed my front seat and used R compound tires. I'm sure the R compound tires easily account for half of that difference. The front seat weighs about as much as 9 gallons of gas.
11-10-07, 06:11 PM
#45
11 Second Club
Thread Starter
I finally got around to measuring the pressure today - the fronts were 34 and rears were 36 (cold air pressure). I think I lost a PSI or two due to the colder weather these days (it was 50 degrees today). So, I can now safely say my runs were probably around 38-39 psi because they run a couple of psi higher when warm. I'm praying that the 60% chance of rain doesn't happen tomorrow morning... My next available day to go racing isn't until Turkey day weekend. Come December, my track closes... and I'll probably have to switch to winter tires by then too.