engine blown @ 5000 miles
#1
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engine blown @ 5000 miles
well as mentioned above car is brand new and done only 5000 miles. The car was running fine for months, but few weeks back was doing 150mph and engine blown in a matter of seconds. The only mods on the car were RalliArt sports ECU (my car is an Evo 7) and 76mm exhaust system starting from downpipe.
after inspection the dealer said that one of the cylinders showed huge increase in temprature, and apparently the conrod bolts got bent and broke loose which made the piston drill a hole like a bullet in the crankcase.
dealer said after inspection that it was factory defect and engine needs to be changed, i say something fishy about the ECU as i bought it second hand (maybe flashed in a wrong way or something similar).
The reason could also be coz of the fuel we use. The RalliArt ECU needs 99+ octane, while we are using here octane much less than that. Not sure how much, but its around the 90. But I dont think it would be a problem as many of my friends own M3s and M5s and all of them require 99+ octane as well but they same fuel i am using without problems. so probably something there caused a problem (not a good technical person, sorry)
well ur opinions are greatly appreciated, let me know what you all think!
Thanks
after inspection the dealer said that one of the cylinders showed huge increase in temprature, and apparently the conrod bolts got bent and broke loose which made the piston drill a hole like a bullet in the crankcase.
dealer said after inspection that it was factory defect and engine needs to be changed, i say something fishy about the ECU as i bought it second hand (maybe flashed in a wrong way or something similar).
The reason could also be coz of the fuel we use. The RalliArt ECU needs 99+ octane, while we are using here octane much less than that. Not sure how much, but its around the 90. But I dont think it would be a problem as many of my friends own M3s and M5s and all of them require 99+ octane as well but they same fuel i am using without problems. so probably something there caused a problem (not a good technical person, sorry)
well ur opinions are greatly appreciated, let me know what you all think!
Thanks
#2
I think it's definetly the fuel problem, your engine was running too lean(therefore detonation occured), if you run high octane gas that's not a problem, but cheaper gas requires the A/F to be tuned richer
Last edited by evo542; Feb 24, 2004 at 12:45 AM.
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I am not located in the US
Yes it 99+ RON (according to japanese instructions manual)
if the problem is with fuel, then how come all the M5s and M3s over here work fine without engine problems?
How can i solve this problem? I need the ECU to avoid fuel cuts
Yes it 99+ RON (according to japanese instructions manual)
if the problem is with fuel, then how come all the M5s and M3s over here work fine without engine problems?
How can i solve this problem? I need the ECU to avoid fuel cuts
#5
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Originally posted by Blue car
I am not located in the US
if the problem is with fuel, then how come all the M5s and M3s over here work fine without engine problems?
I am not located in the US
if the problem is with fuel, then how come all the M5s and M3s over here work fine without engine problems?
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Originally posted by Blue car
I am not located in the US
Yes it 99+ RON (according to japanese instructions manual)
if the problem is with fuel, then how come all the M5s and M3s over here work fine without engine problems?
How can i solve this problem? I need the ECU to avoid fuel cuts
I am not located in the US
Yes it 99+ RON (according to japanese instructions manual)
if the problem is with fuel, then how come all the M5s and M3s over here work fine without engine problems?
How can i solve this problem? I need the ECU to avoid fuel cuts
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Yep. RalliART ECU is for sports set-up (hi octane fuel needed, probably has more boost). I think it even says it on the RalliART site that you need higher octane than usual pump gas.
Street gas + higher boost than stock = detonation = blown engine.
Street gas + higher boost than stock = detonation = blown engine.