EVO IV Boost cut fuel cut???
Dec 8, 2010, 08:20 AM
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EVO IV Boost cut fuel cut???
almost ever time mostly in 3rd 4th and 5th it get boost cut fuel cut. Changed plugs with bpr7es .70mm gap tighten piping but i do have small leak on the wastegate, wastegate on order as well, attached video.
http://www.youtube.com/watch?v=RzFy8L-rIxs
http://www.youtube.com/watch?v=RzFy8L-rIxs
Last edited by erik.bouse; Dec 8, 2010 at 08:34 AM. Reason: update
Dec 8, 2010, 02:36 PM
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Stock evo4 ecu's cannot be tuned.....And are you running a separate boost controller?
What kind of wastegate? internal? external?
That's 1.3 bar!!=19psi!.
Standard boost for 4's = 0.9 bar(13~14 psi)
Anything past that you'll need to enhance the fueling(I went with E6 ecu, 560cc injectors and High Press. 225L fuelpump and reflash).
It's the general consensus on the forums that the stock e4 engine shouldn't be fed over 1.3bar(due to the weak ringlands of the E4 piston design.....rectified in E5 onward).
Honestly i can't make out if that's a missfire....boost/fuel cut feels as if you ran into a wall, as if the engine just dropped out from underneath the car and became an anchor....(at the vids end, though?)
As per the forums the plug gaps are set anywhere between 0.5mm to 0.8mm.
hope this helps a little.....
What kind of wastegate? internal? external?
That's 1.3 bar!!=19psi!.
Standard boost for 4's = 0.9 bar(13~14 psi)
Anything past that you'll need to enhance the fueling(I went with E6 ecu, 560cc injectors and High Press. 225L fuelpump and reflash).
It's the general consensus on the forums that the stock e4 engine shouldn't be fed over 1.3bar(due to the weak ringlands of the E4 piston design.....rectified in E5 onward).
Honestly i can't make out if that's a missfire....boost/fuel cut feels as if you ran into a wall, as if the engine just dropped out from underneath the car and became an anchor....(at the vids end, though?)
As per the forums the plug gaps are set anywhere between 0.5mm to 0.8mm.
hope this helps a little.....
Last edited by raulthode; Dec 8, 2010 at 02:39 PM.
Dec 9, 2010, 01:29 AM
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Running evo VI injectors with evo VI ecu 255 fuel pump not yet installed 3" exhaust. camed not sure what kind 255's I believe tho the guy I bought it from didnt know much about what was done to the car. Like I said I did find a leak on the stock wastegate order new OEM wastegate hoping this stops once I put the fuel pump and wastegate in...
Dec 9, 2010, 01:57 AM
#6
cutting at that boost level is 100% normal.
You can move the cut with Ecuflash and a 2.0 cable for the evo6 ecu. I did this on my car.
but obviously you'll want to get a full retune.
Leaning out the fuel mixtures with a near stock car will get you 40-50whp.
Increase the boost for more power. Max on stock injectors and 255lph pump is approx 250kwatw (340whp)
Cheers, Mike
You can move the cut with Ecuflash and a 2.0 cable for the evo6 ecu. I did this on my car.
but obviously you'll want to get a full retune.
Leaning out the fuel mixtures with a near stock car will get you 40-50whp.
Increase the boost for more power. Max on stock injectors and 255lph pump is approx 250kwatw (340whp)
Cheers, Mike
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Dec 9, 2010, 10:59 AM
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it could be I'm pretty sure i got an exhaust leak as well... but like I said before have no clue why.. putting the 255 in this weekend so will see how that goes with it hopefully it fixes it.
Dec 11, 2010, 02:28 PM
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By wastegate do you mean actuator or the turbine housing itself ?
Also correct me if I'm wrong but I think Evo 4's were the first of the reversed twin scroll 4G63T engines and I think they had the smallest 9cm turbine housing size std .
If thats the case I'd be getting hold of any of the 10.5cm turbine housings and preferably the later single flat valve version from the 8MR or any of the 9's .
Turbine inlet pressure and heat will make life hard on your pistons and along with combustion temps is the most likely thing that will kill them .
A .
Also correct me if I'm wrong but I think Evo 4's were the first of the reversed twin scroll 4G63T engines and I think they had the smallest 9cm turbine housing size std .
If thats the case I'd be getting hold of any of the 10.5cm turbine housings and preferably the later single flat valve version from the 8MR or any of the 9's .
Turbine inlet pressure and heat will make life hard on your pistons and along with combustion temps is the most likely thing that will kill them .
A .
Dec 12, 2010, 02:39 AM
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By wastegate do you mean actuator or the turbine housing itself ?
Also correct me if I'm wrong but I think Evo 4's were the first of the reversed twin scroll 4G63T engines and I think they had the smallest 9cm turbine housing size std .
If thats the case I'd be getting hold of any of the 10.5cm turbine housings and preferably the later single flat valve version from the 8MR or any of the 9's .
Turbine inlet pressure and heat will make life hard on your pistons and along with combustion temps is the most likely thing that will kill them .
A .
Also correct me if I'm wrong but I think Evo 4's were the first of the reversed twin scroll 4G63T engines and I think they had the smallest 9cm turbine housing size std .
If thats the case I'd be getting hold of any of the 10.5cm turbine housings and preferably the later single flat valve version from the 8MR or any of the 9's .
Turbine inlet pressure and heat will make life hard on your pistons and along with combustion temps is the most likely thing that will kill them .
A .
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