sorry I am having trouble attaching my file...

 

will email file to someone with knowledge because I do not have excel on this computer and It will not let me attach.

 

If the supercharger engages and disengages properly under normal driving conditions, but does not do so under extreme heat scenarios (as it should), then wouldn't that suggest that there is an error in programming somewhere? Not necessarily from a tune but even from a stock ECU programming unless the ECU is receiving incorrect values or your datalogging equipment is not accurate. This is very strange....

 

Latest Log, temp 40 F%@#*ing degrees on May 6, that's just not right.

Added gear to last column just for giggles, While only logging IAT, RPM and Timing I was able to get down to .5 second sample rate.

Upgraded Heat Exchanger and Johnson pump, think I might have a bubble in the system.

Thoughts?

 

What mods do you have other than the HE and Pump?

 

I don't think you have an air bubble, the IAT's came down real fast when you got off the boost. You car has a lot more timing than I see on mine. I suppose it's the heat where I live more than anything else.

Les

 

Your IATs stayed under 150 for the most part and did not go up as quickly as it went down relative to you rpm increase/decrease.... I doubt you have a bubble.

 

Here is his file:

 

Thanks Jason

 

172 Pulley and tune

 

Yeah I am concerned about the timing also, seems fairly high.

Sweet, thanks - fun doing 135 plus

 

Marcus and Mo,

I can tell you that when I punched mine twice the IAT would go over 200 but the SC wouldn't disengage immediately. It did however disengage when I punched it a few seconds later. No power was my evidence for this. Point is I'm not so sure that it instantly disengages when the IAT go from 199 to 200. I think there is more involved then just the IAT parameter. I've noticed that when it does go out it's always when I get back on the throttle, not during WOT. I'm betting that if you just kept your foot in it to get the IAT's as sky high as you could it would give out but again I don't think it's the instant it hits 200. From a little experience. I could be wrong however as my data logging and experience is limited.

Marcus,

I'm not sure how you're datalogging your IAT's, through the OBD-II or directly, but I'm going to do both just so I can get a "second opinion" on an important number and also so the sampling rate is nice and fast by doing it directly. If you aren't doing it directly but can I would suggest that.

Another thing to consider if you have sepearted your HE from the engine cooling is that you may have an obstruction somewhere either in the HE itself or a pinched hose. It may not show the pinch unless there is pressure in the system so just consider that. But having the fluid backing up and getting "stuck" in the intercooler could possibly show the symptoms you are having.

The other thought I had was that you didn't have enough volume which could cause problems. After reading all this I am going to do my best to double up on the HE's and add a good amount of volume. Eventually I'm going to do a resevoir but my 1/4 mile access is limited and what is available is in the mountains so I'm not looking for record breaking ET's so an ice box isn't a big deal for me personally aside from an easy way to add volume. Also give me a good excuse to put a HE in the rear bumper.

 

Thanks Luke,

What you suggested was actually another possibility that I was thinking about.... that maybe a minor leak or internal obstruction in the HE or even one of the hoses is causing this, but I get the feeling that Marcus have already checked that Do you know what temp IAT temp is guaranteed to shut off the supercharger?

 

I don't know what temp is guaranteed to shut it off. I've just always heard 200 was the limit but I can see that it's not an on/off switch at 200. It could be that it will disengage next time you left off the throttle so it's not so abrupt or maybe another combination or perhaps a certain amount of time over 200. When it has shut off before like I said it always pulled ok, then when I got back on the throttle there was nothing.

Wrapping the IC is interesting. I wouldn't mind doing that if I had access to it say during a throttle body install or something. I wonder how much of an affect this had? Maybe it would cut down on heatsoak some? I still think you're kinda screwed with the stock IC but I know water/meth could help. I still can't wait to get the bumper off and try to fit a second HE in there some where. I just have this radiator sitting begging me to make it work lol.