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Discussion Starter #1
I ran @ California Speedway this evening.
Car is bone stock + stereo + full 15lb bottle of n2o, except for 1 heat range colder plugs for the nitrous that's being installed.

Temp was about 68, and it was overcast.
Tires were at full pressure, no burnout, traction control on.
California Speedway is 1121.27 ft above sea level.

60 ft 2.151

1/8 8.860 @ 82.40
1/4 13.637 @ 104.11

I'm very happy with these times considering I ran 14.1 @ 98 @ LACR when the car was lighter.

:banana: :banana: :banana:
 

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But so I'm guessing that the nitrous isn't yet active, right? Have you tried with traction control off? I ask because it seems like it's possible in those temps to get 2 flat on the 60ft based on other slips.
 

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Discussion Starter #3
marlinspike said:
But so I'm guessing that the nitrous isn't yet active, right? Have you tried with traction control off? I ask because it seems like it's possible in those temps to get 2 flat on the 60ft based on other slips.
Nitrous is not active yet. I only had 1 run tonight so I figured that I'd just run it with t/c on. At another track I ran with fuse 17 pulled, lower tire pressure and a burnout but it didn't seem to make much of a difference.

I really believe that the t/c is pretty damn smart. I think it will do a better job of peddling than I will!?!?
 

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I dunno, I haven't done any timed runs, but just from feeling it seemed like the ESP on on this thing is just wayyyyy too invasive. Perhaps ESP "off" (the regular off, not holding for 7 seconds off) is a good compromise?
 

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These are good times. Have you read through the two posts I've made on the 12 second runs this week and last yet?

High 13's are the times I saw with close to the same temps as you now have in CA. Now at 56 - 60 degrees, I am seeing times in the low 12.9's. I am from CA and you will need something like this or a Water/Alcohol setup to get rid of the Heat Soaked effect. I will be going this route over the winter, getting ready for next year.
http://www.designengineering.com/products.asp?m=sp&pid=4
 

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Do you guys have 93 octane out in L.A.? I was under the impression that California had 91 octane. If this is true that could make a difference on performance and your ET's.
 

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temp related

just another opinion...

if you let the car cool down by pushing it up to the line, keep the hood up a little, etc., you may avoid the heat soak condition that will cut your times drastically. the engine mangement is way conservative and kicks you down the spark curve if the engine is hot. Fuel quality is a factor. Use ONLY Top Tier fuels.

We got our best time with ESP disengaged. I ran the engine enough to get the oil temp up and then pushed it right up to the start. Tricky to get in enough driving to warm everything up to safe levels and yet avoid the dreaded "heat Soak"! I would never run the car from a true cold start!

Just wait until we get some true software developed for these engines. Someone somewhere will figure them out, I've heard there is a lot more horsepower available.


Steve
06 CSRT8
all stock, all original
 

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Discussion Starter #8
GAS - Nope. 91 Octane at the pump. Every once in a while you come across a station that has 100 octane, but that's overkill. I could try a mix and see if mph improves.

TEMP - The car's oil temp @ the time of the run was 140. It had been sitting for 2-3 hours and I just drove through staging.

INTAKE TEMPS - That thing (CRY02) is pretty cool but I'll have nitrous soon, that should take care of my intake temps.
 

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IGOTTASRT8 said:
GAS - Nope. 91 Octane at the pump. Every once in a while you come across a station that has 100 octane, but that's overkill. I could try a mix and see if mph improves.

TEMP - The car's oil temp @ the time of the run was 140. It had been sitting for 2-3 hours and I just drove through staging.

INTAKE TEMPS - That thing (CRY02) is pretty cool but I'll have nitrous soon, that should take care of my intake temps.
Is it 100 or 110? I know 110 is racing (really aviation) gas and not to be used in cars with cats (I've only seen the 110 at a gas station for cars in Detroit, and it had warning labels). Isn't 140 kinda cool for the oil? Hotter oil is thinner oil is more power, no?
 

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IGOTTASRT8 said:
INTAKE TEMPS - That thing (CRY02) is pretty cool but I'll have nitrous soon, that should take care of my intake temps.
Nitrous won't take care of Heat Soak. Nitrous will allow for more oxygen and fuel in the combustion chamber. The resultant heat of compression (on the compression stroke of the engine) breaks down the nitrous oxide compound into inert nitrogen and frees oxygen available to support the combustion of extra fuel. This means more fuel can be burned than air alone would support. Burning more fuel releases more heat, which creates more expansion of the working fluid (mostly nitrogen) in the cylinder for more pressure on the piston. The result is more power.

EDITED: And just in case it comes up Purists will hasten to point out that liquid nitrous oxide in its pressurized container will instantly change state to a vapour when it is depressurised into the engine’s intake system, significantly cooling the intake air for increased density, and that equates to more oxygen in the air too. The downside to this relatively simple and inexpensive method of “supercharging” an engine is that nitrous oxide is consumed at a rapid rate in order to make meaningful power increases. Consequently, nitrous oxide is only injected for short spurts at full throttle, usually lasting no more than 10-15 seconds at a time.

The Cyr02 system is designed to dramatically cool the intake air (oxygen) temperature as well and is really designed for drag applications too since a full bottle will only last about 3.5 minutes of continuos flow and will help avoid the Heat Soak condition. Thus the advantages of a Water / Alcohol set up for a misted spray onto an intercooler setup.
 

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Discussion Starter #11 (Edited)
XCITsNU said:
Nitrous won't take care of Heat Soak. Nitrous will allow for more oxygen and fuel in the combustion chamber. The resultant heat of compression (on the compression stroke of the engine) breaks down the nitrous oxide compound into inert nitrogen and frees oxygen available to support the combustion of extra fuel. This means more fuel can be burned than air alone would support. Burning more fuel releases more heat, which creates more expansion of the working fluid (mostly nitrogen) in the cylinder for more pressure on the piston. The result is more power.
The Cyr02 system is designed to dramatically cool the intake air (oxygen) temperature and will help avoid the Heat Soak condition.
You've obviously never had someone crack open a nitrous bottle and spray it on your hand.

http://auto.howstuffworks.com/question259.htm

edit - lol, I just saw your edit.

I guess my point is, the only time I want this cooler intake charge is when I'm racing, which is not very often.
 

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Igotasrt8

all you got was 1 run in because of all of the "others" huh?
ok, that sucks.
Thanks for being the guinea pig on that one...
Irwindale is looking like the only option for 1/4 mile times...
 

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Discussion Starter #14
cbutler32 said:
all you got was 1 run in because of all of the "others" huh?
ok, that sucks.
Thanks for being the guinea pig on that one...
Irwindale is looking like the only option for 1/4 mile times...
Irwindale is an 1/8 mile track. Very sticky, but only 1/8 mile.

The day I went to California Speedway it was a PSCA event......I was the slowest car there. I only signed up for test n tune, which is why I only got the 1 run in.

But, since I was running with 7, 8 & 9 second cars there was plenty of rubber to make the track sticky.

I'm not sure what it's like on a normal night (imports, etc) but I've heard that it's good....just crowded.
 

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ESP off, unscientific, but convincing

marlinspike said:
I dunno, I haven't done any timed runs, but just from feeling it seemed like the ESP on on this thing is just wayyyyy too invasive. Perhaps ESP "off" (the regular off, not holding for 7 seconds off) is a good compromise?

Have not been to the track with my SRT8, but have done some very non scientific trial runs at 0 - 60, timing it with a stop watch. Have had wide range of results, from 4.80 to 6.25 . The lowest, the 4.8, was ESP off, but not the 7 second off. In fact, the higher times including the 6.25 were with the 7 second ESP all off. Have not learned how to launch without major tire spin in this mode. However, with the regular ESP off, it feels like the tranny has more torque and cleaner more powerful shifts without as much wheel spin on launch. This car is very easy to drive, but as with any vehicle, one must learn the subtleties to maximize the SRT8's potential and it will take a bit of practice and experimenting to really know how to get it all out on the road.
 
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