This started about 2 days ago... I have a 2004 r53 JCW with 100k miles.. 440 injectors, 17% SC pulley, RMW headers, RMW exhaust, RMW tune... the other day I started having issues with RPM's... when I'm in 3rd 4th 5th or 6th gear under 3000 RPM as soon as I punch it and it hits 3000 RPM it will "flare" to 4000 RPM... and "hover" at 4000 RPM for about 1-1.5 seconds.. after it "catches" back up with itself it pulls again like normal... it is always between 3-4000 RPM. I figured a slipping clutch... however no matter how many times I do this I can't smell ANY clutch.. any other ideas? RMW says check the TMAP sensor.. I will do that. I have no codes being thrown and the boost pressure is constant through the "flare". Could it possibly be fuel related? I am going to replace the fuel filter tonight and see if that makes a difference. I am stumped and looking for any help PLEASE!

 

First thing that jumps to my mind is Crank Pulley... check for shredded rubber bits around the crank pulley when you look up under...

Hoping it is something simple...

Motor on!

 

Jan is usually pretty good at what too look at...
Remember you have 2 sensors...
the cold side t-map is a r50 tmap but only uses the MAP function....it is NEXT to the motor, on the side near the air filter... (you will notice it only has 3 wires, but 4 pins on the plug)
and the "hot side" t-MAP, both functions are used, and it is screwed into the front of the manifold..peek behind the radiator trim/molding on the upper right side...
Both are held in by 2 Torix (may hex) screws.....
Warning here...THEY LOOK the same, but are DIFFERENT...different part numbers, with different sensor limits, so are NOT interchangeable.

 

update on this...
checked fuel pressure last night and everything is where it should be...
put a new "hot side" TMAP sensor in and it did not fix the problem...
Jan wants me to check BPV tonight and see how that is looking... I'm only making 10-11 pounds he says I need to be at 14 pounds, so I have some major leaks somewhere. Going to also put on a new pair of Alta intercooler boots and see if maybe that's where the leak is starting...

oh and check crank pulley and it's fine!

 

Was it your clutch because my car does the same thing and I thought its the clutch

 

update on this... took the whole front end apart last night... bypass valve looks good, HOWEVER the throttle housing to the supercharger was broken off where it connects with the supercharger. Will have a new one on the way today! If this does not solve the problem it's back to the drawing board!

 

On my 2005 Mini with CVT tranny, the flare is caused by the CVT shift programming.


Strange but true. There is a sequence of reprogramming it, but apparently, you can also shift to manual mode and drive aggressively and the brainbox will relearn how to be normal. I kid you not.


Peter