I hooked up a Carchip E/X tonight and did some runs. I have the JCW intake, a 15% pulley and MTH's latest version. I have IK22's ready to put in tomorrow, and will do nother run.

With the stock plugs in, at WOT from 1st, timing is being pulled to -5 deg. Does this indicate retard for knock, indicating the need for the lower heat range plugs? How much of a rise in timing should I see tomorrow if so?

This should be a good test for the experts as well

 

I also have mth and a scanner. When coasting mine will be between 30-40. Then when at full throttle it drops to 20 and works it way up to 30. Every time I've checked it that has been the pattern. I have a 15% pulley, intake and exhaust and have tried it with stock plugs, stock range autolite and ik22. Also, I have never seen a negative number on my car.

 

I wonder if this carchip is gathering the data correctly then. My ranges are way up there when coasting though. I'll keep playing with it.

 

Cartune E/X?

 

CarTune E/X?

Do you mean CarChip E/X?

 

Yeah - brain fart - edited

 

Okay - I have that product too... really nice. Question: How are you getting it to record the engine "timing"? I didn't know it would do that. You know the instruction book (?what?) or lack of one... didn't tell me enough.

 

The standard Carchip doesn't let you choose parameters to log, the E/X lets you choose up to 4 from a list of 20 or so. Timing is one of them.

 

OK, here's a chart from this morning coming into work, this is still with the stock plugs. What I don't understand is why the timing is being pulled not on accelleration, but on off-throttle. Does this look right? Blue is speed, purple is timing advance/retard.

 

the retarding during decel or off-power-demand periods is some sort of emission function...lower heat to curb nitrogen oxide artifacts...just a WAG.

 

I wonder if that's what's casuing the overrun burble?

 

mainly because I don't have an S and my MC doesn't burble. I guess it could be that, or the exhaust, or both. I wouldn't begin to know how to disable the function to isolat it...probably in the chip profile.

 

and of course, the usual acompanying headache lol...I'm real new to the MINI world and I've reached the age where I don't like to get grease under my fingernails, so I haven't really looked at the car the way I used to. That said, I have a question...is the exhaust system on my MC the same as on your S? I doubt it but if they are, then the burble question doesn't pend on the exhaust (unless of course mine DOES burble and my old ears lost that frequency in the spectrum lol)

 

No, they aren't the saame.

 

I would say this is almost certainly the cause of the burble. That was my guess anyway, before you logged these reults. This just confirms it. When we tune 'big turbo' VW's we have similar burbling results and I believe for the same reason. Obviously the 2005's had this programmed in intentionally.

 

OK, plugs are changed to the IK22's. I'll do another run on the way home. Temps will be about 15 deg hotter and humidity is about 100% today.


Here are the stock plugs after 3000 miles. 1500 stock, 1000 with an intake and pulley, 500 with intake, pulley and MTH:

 

Well, with the plugs switched to the colder IK22's, and the weather about 15 deg hotter (85) and humidity in the upper 90's, there is absolutely no difference from the stock plugs, with a JCW intake, 15% pulley and MTH software. Butt-dyno says identical, logs show the same readings.

At least the plugs were cheap, and I have perfectly good OEMs to put in when these wear out.