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Old 13-08-2018, 13:51   #16
Evo8.Rob
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According to mapper, Evo turbos are fairly known to have the central vein crack and become distorted?!
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Old 13-08-2018, 13:59   #17
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I don’t know , I’m not an expert. But it doesn’t sound right to me. Who’s the mapper? Are they on here? Be nice to have some opinions . If it’s distorted and cracked I can’t imagine it’s going to work very well, and it’s going to come to pieces pretty easily.
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Old 13-08-2018, 14:17   #18
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Quote:
Originally Posted by Evo8.Rob View Post
According to mapper, Evo turbos are fairly known to have the central vein crack and become distorted?!
yes, very common... but your problems do not sound like a faulty turbo to me...
it would be great if we could see some logs of the problem..

it sounds like overboost condition and the ecu pulling the timing and boost
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Old 13-08-2018, 14:29   #19
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Quote:
Originally Posted by Mita View Post
I donít know , Iím not an expert. But it doesnít sound right to me. Whoís the mapper? Are they on here? Be nice to have some opinions . If itís distorted and cracked I canít imagine itís going to work very well, and itís going to come to pieces pretty easily.
The mapper is very reputable, i believe they are on here. I'm trying to source graphs now, will then load on to here.
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Old 13-08-2018, 14:36   #20
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Itís an interesting problem, im looking forward to hearing what it is

I hope that itís an reasonably easy fix mate


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The mapper is very reputable, i believe they are on here. I'm trying to source graphs now, will then load on to here.
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Old 13-08-2018, 14:40   #21
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Itís an interesting problem, im looking forward to hearing what it is

I hope that itís an reasonably easy fix mate
I shall keep you posted-

checking ignition side of things tonight (just incase a dodgy plug etc)
Also checking air filter side of turbo for misshaped fins and what not!
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Old 13-08-2018, 14:41   #22
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Nice one and best of luck
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Old 14-08-2018, 10:43   #23
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Took it to a mate yesterday who knows his way round the evo engine. First port of call he thought it was wastegate, That was fine so follwed the vac lines to the 3 port solonoid they were slightly pinched so removed airbox and re directed them.

also took one of the nipples out the solonoid as he thought the sudden rush of escaping air coming out the solonoid hole say 8mm or something down to 2.5mm it may have thrown a wobbly..

Removed that - it has improved. It doesn't feel as viscous now but it's still there! he also wrote off saying it's 100% not clutch after driving it.
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Old 14-08-2018, 10:52   #24
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your car is overboosting.. it is a mapping issue..
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Old 14-08-2018, 10:54   #25
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just guessing, I would say your base WGDC is too high..
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Old 14-08-2018, 10:57   #26
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Did he check turbo?

Quote:
Originally Posted by Evo8.Rob View Post
Took it to a mate yesterday who knows his way round the evo engine. First port of call he thought it was wastegate, That was fine so follwed the vac lines to the 3 port solonoid they were slightly pinched so removed airbox and re directed them.

also took one of the nipples out the solonoid as he thought the sudden rush of escaping air coming out the solonoid hole say 8mm or something down to 2.5mm it may have thrown a wobbly..

Removed that - it has improved. It doesn't feel as viscous now but it's still there! he also wrote off saying it's 100% not clutch after driving it.
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Old 14-08-2018, 11:00   #27
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took off the inlet side to the turbo, little bit oily but he didn't physically check the fins that's what i plan to do this eve. He was on limited time so done pre checks as such.
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Old 14-08-2018, 11:03   #28
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I think Kiki is talking sense TBH , he knows his stuff
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Old 14-08-2018, 12:00   #29
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Quote:
Originally Posted by kikiturbo View Post
just guessing, I would say your base WGDC is too high..
I am awaiting images of the dyno graphs. Is there anyone in particular you would want? They showed me numerous ones to do with fueling torque etc etc.

Or could you not tell from the graphs?
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Old 14-08-2018, 16:03   #30
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boost plot at a minimum, but you really want a log from the ecu... like ecu load, WDGC, WDGC error,

basically, evo's will usually overshoot their boost target. What happens is that when you load up the car at low rpm the boost will shoot up, and the base waste gate duty cycle (WDGC) will be too high, esp with 3 port solenoid. When the boost readches the desired level the ecu will start lowering the duty cycle, but depending on the settings in the map iit will not pull it fast enough. Also, evo ecu looks at ecu load, which is measured at MAF and not boost directly (depending on model)... so ecu will sometimes be too slow to react. As a result you will overshoot the target boost. Now, in the ecu you have some load limits in the map, and if you overshoot those you will have a pretty hard limit that you will hit and will sense it, like a hard RPM limit..
if you do not hit that limit, and overshoot boost, you can have knock, and then the ecu will pull timing and add fuel. As a result you can feel the engine boost up hard, then loose power for a while....

if you look at your boost you will probably see boost go up, spike and then drop down.. that is what is sounds to me... In any way you will need a good log of it happening to see what is going on.. maybe a look in the map too..
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