Evo's been remapped, but...

ChrisD.

ChrisD.

ChrisD.

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Joined
20 Sep 2006
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What's this all about then? Feels great WOT in low gears and coming through them, but WOT in high gears at 3k rpm my intake makes odd noises - almost like it's over boosting then being cut back? I'm no expert though.


Waiting on the tuner getting back to me.
 
It's basically requesting too much boost and the engine isn't able to take all of the air making the compressor stall as the air doesn't have anywhere to go. This normally happens when it's a generic map and you have an aftermarket intake. Or has in my experience.
 
Sounds like compressor surge, the boost request from the controller on your car is placing the compressor pressure ratio beyond the surge line at that mass flow. Basically the compressor blade are chopping at the air as the engine isn't consuming it fast enough and your getting compressed pockets of air that are slowing the compressor as its got no where to go and there is is sufficient turbine shaft torque to maintain its speed.

Need a less aggressive boost target at low rpm.
 
gigeorge said:
Who did it? Not powerstation?
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Indigo GT. It was fine on the rollers, and on the road test after. I didn't notice this till on the way home and unfortunately they'd closed by then. I expect Ant will want the car back to remap it. I don't want to point any fingers etc, just want to understand what the problem is. :)
 
MilanoChris said:
Indigo GT. It was fine on the rollers, and on the road test after. I didn't notice this till on the way home and unfortunately they'd closed by then. I expect Ant will want the car back to remap it. I don't want to point any fingers etc, just want to understand what the problem is. :)
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Indigo are well regarded, am sure Ant will sort you, when I had my EVO X everyone said go to theRacingLine or Indigo, plus Powerstation too. Mine was a 360 though so I did not want to mess with the map when the car was making 400+ anyway on stock map and drove great, plus the guys at racingline said they could map it but gains would be minimal and poor value for money.

Am sure you'll get it sorted, just take it easy.
 
Cheers Gibbo. Unfortunately I have to go to London tomorrow morning. :( Hopefully Ant can fit me in soon.

Could it be a failing actuator or something else?
 
MilanoChris said:
Cheers Gibbo. Unfortunately I have to go to London tomorrow morning. :( Hopefully Ant can fit me in soon.

Could it be a failing actuator or something else?
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Would seem today is the day for cars to break. :(

At the the meet and drive back on motorway I heard a note change in my engine between 3000-4000rpm, but just thought maybe it was induction noise.

Just finished changing my wheels to the ones with legal tyres and giving the wheel wells a good clean and getting rid of any pebbles, went out for a drive and noticed noise seemed a little louder, wound passenger side window down and instantly knew it was the baffle in the left side exhaust, gone AGAIN. Sound like dried peas rattling in a tin, bloody awful, oh well have to get it sorted again...... :(
 
The meet today or at PS a few months ago? Bad luck, I need to replace my power steering pump and I could do with a new backbox.

****ing cars. :D
 
I guess rolling road didn't cover that load site under steady state else it would have done it on that aswell as on the road as you're finding.
 
MilanoChris said:
The meet today or at PS a few months ago? Bad luck, I need to replace my power steering pump and I could do with a new backbox.

****ing cars. :D
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One today.
Shall use the Jaaaag until I can get booked in, doubt it would cause any harm, but not worth taking chances.
 
As said. Compressor surge. Seems odd to get it on a standard turbo, even with running more boost.

My old car used to do it uphills at 2.5k in 5th but that had a different turbo to standard. It's not good for the turbo so don't do it too much, you can always try a less binary throttle to drive around it.
 
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