timing and iat

[Supercharged SS]

Originally Posted by dan0617

Ooh I'm not saying you are making anything up. By saying hard to believe I mean it seems either some sensor or something isn't reading right, or IAT's on top mounts aren't as bad as everyone makes them out to be.

One other thing with my IAT's is that I haven't made it to a track yet, so all my readings are on a wot pass immediately after decelerating on the street. The more reading I do I'm finding that decelerating seriously increases IAT's and heat soak.

Not sure yet if the OP and I need to change anything yet, or not.

At 8 psi the Maggie isn't that bad. Double that psi and you can start boiling water on it!

[2SSCAMARO]

For sure...even on the street if you are logging you will see an instantaneous increase in IAT when you lift even slightly on the accelerator pedal. You can see on both logs at the beginning of the launch when the intake air velocity increases and the car starts to move in first gear, the iat starts to drop until the heat from the compressed blower air overcomes the initial effect of increased ambient air flow. Following the lift at the traps, the iats will continue to climb but only for a second or two and then the iat immediately starts dropping again as seen in the logs.

[2SSCAMARO]

Originally Posted by Supercharged SS

At 8 psi the Maggie isn't that bad. Double that psi and you can start boiling water on it!

That's why I stay where I'm at. I don't drink instant coffee and I don't have a roll bar.

[Supercharged SS]

Originally Posted by 2SSCAMARO

That's why I stay where I'm at. I don't drink instant coffee and I don't have a roll bar.

Roll bars make it more fun!!

[dan0617]

Originally Posted by 2SSCAMARO

For sure...even on the street if you are logging you will see an instantaneous increase in IAT when you lift even slightly on the accelerator pedal. You can see on both logs at the beginning of the launch when the intake air velocity increases and the car starts to move in first gear, the iat starts to drop until the heat from the compressed blower air overcomes the initial effect of increased ambient air flow. Following the lift at the traps, the iats will continue to climb but only for a second or two and then the iat immediately starts dropping again as seen in the logs.

All my logging has been on the street immediately after driving around. I drive down the highway 2 miles, quickly slow down to about 15 mph, then roll it to the floor and hold it there till about 125 mph.


I also am running 12psi with only 1 Vortech race bypass. I ordered another one and a flange today. Ted suggested running 2 of them over 8 psi. Might help some with the heat soak from high IAT decel. Ill also try a run starting without a drive around and hard decel first.

I don't think want meth as I already spray a 100 shot wet. That cools the IAT I'm sure, but I want them to be pretty low off the spray.

[Supercharged SS]

Originally Posted by dan0617

All my logging has been on the street immediately after driving around. I drive down the highway 2 miles, quickly slow down to about 15 mph, then roll it to the floor and hold it there till about 125 mph.


I also am running 12psi with only 1 Vortech race bypass. I ordered another one and a flange today. Ted suggested running 2 of them over 8 psi. Might help some with the heat soak from high IAT decel. Ill also try a run starting without a drive around and hard decel first.

I don't think want meth as I already spray a 100 shot wet. That cools the IAT I'm sure, but I want them to be pretty low off the spray.

My little 55 dry shot had absolutely no effect on cooling the intake temps. Now, I'm not sure where my log reading is being taken from. I spray post maf so if the maf is giving the reading its obviously not picking up the nitrous.

[2SSCAMARO]

In wanting to not be misleading in what I've said and posted, I also want to say the following. I very seldom race in the Florida heat. I usually only race in the cooler temps in our winter months... usually ambients in the 60's degrees. I did race a couple of weeks ago at the Modern Muscle Car event when the temps were in the low eightys and long staging lines. I was trapping about 133* iats that day. Another influencing factor, and I'll say upfront that I am not going to get into any pissing contest regarding whether this is a good or bad thing, but I do run a 160* stat. My ECT at launch are usually about 190*. Those two factors do of course have an affect on the IAT's.

[2SSCAMARO]

I hear that the EPA has changed their theory on the polar ice caps melting. They have recently discovered that the glaciers have not been melting per se, someone has been taking the ice and putting it in a huge ice chest and doing something to cause it to rapidly melt, then disposes the water.

[Supercharged SS]

Originally Posted by 2SSCAMARO

I hear that the EPA has changed their theory on the polar ice caps melting. They have recently discovered that the glaciers have not been melting per se, someone has been taking the ice and putting it in a huge ice chest and doing something to cause it to rapidly melt, then disposes the water.

Yeah but those 60 degree starting temps are just to hard to give up. No heat soak for this guy!!

But on a full day Ill use 200 lbs of ice. I've never actually thought about that. Quite a bit.

If anyone in the tri state area needs the cheapest place to buy ice Ill be able to point them in the right direction!!

[dan0617]

Everyone in the stands at your track prolly have to drink warm beer since you use up all the ice in the county.

[2SSCAMARO]

Originally Posted by dan0617

Ooh I'm not saying you are making anything up. By saying hard to believe I mean it seems either some sensor or something isn't reading right, or IAT's on top mounts aren't as bad as everyone makes them out to be.

One other thing with my IAT's is that I haven't made it to a track yet, so all my readings are on a wot pass immediately after decelerating on the street. The more reading I do I'm finding that decelerating seriously increases IAT's and heat soak.

Not sure yet if the OP and I need to change anything yet, or not.

For the purpose of discussion, let's say the iat sensor isn't reading right BUT what about the other data? The spark advance is steady as a rock at 17.5 degrees advance throughout the run except obviously at the shift points and with ZERO KR. This was May 5th when the outside air was 83* and was fueled with 93 octane E90, no meth, no nitrous, no chiller. My knock sensors are not desensitized either.

[dan0617]

Awesome! Rules out that.

[Supercharged SS]

Ill have to check my logs tomorrow and see what the iats look like. I delete all the old ones so currently I have no data to enter into the ring.

[realcanuk]

Originally Posted by 2SSCAMARO

For the purpose of discussion, let's say the iat sensor isn't reading right BUT what about the other data? The spark advance is steady as a rock at 17.5 degrees advance throughout the run except obviously at the shift points and with ZERO KR. This was May 5th when the outside air was 83* and was fueled with 93 octane E90, no meth, no nitrous, no chiller. My knock sensors are not desensitized either.

Whats interesting here is that you are pulling no timing out at 140 degrees. I dont know the details of your build but most tuners do pull at least a little by that temp.