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#31 | |
Registered User
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Quote:
With regards to seeking a log.. is there something i can plug in to read it? |
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#32 |
Registered User
Join Date: Dec 2017
Location: Derbyshire
Car: Evo V GSR
Posts: 30
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With the wastegate duty at 0% it should effectively run Actuator Base Boost Pressure and certainly not be spiking.
This would suggest a Problem with the Actuator or Actuator Plumbing. Is it a stock actuator? Last edited by Evo-Paul; 14-08-2018 at 16:44.. |
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#33 |
Registered User
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it is a stock Evo 8 actuator. They pressure tested it to see that it was moving freely. Yesterday I had a mate look over the car, he noticed the vac lines off solonoid were ever so slightly pinched. A quick re route enabled them to be free and it became ever so slightly better..
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#34 | |
Registered User
Join Date: Dec 2017
Location: Derbyshire
Car: Evo V GSR
Posts: 30
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Quote:
I'm wondering if the Diaphragm in the Actuator is leaking, and at high load the Actuator isn't strong enough to open the wastegate fully/at all, causing boost to climb, boost would then taper off at higher RPM. Try connecting the nipple on the turbo outlet pipe directly to the actuator with a short piece of Vac hose, and see what sort of boost pressures you get. It should boost to what ever the actuator spring is (I'm not sure on an 8 actuator). If it works ok like that, then try a different boost solenoid. Last edited by Evo-Paul; 14-08-2018 at 17:07.. |
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#35 | |
Registered User
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Quote:
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#36 | |
Registered User
Join Date: Dec 2017
Location: Derbyshire
Car: Evo V GSR
Posts: 30
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Quote:
The only way the revs can increase and then drop without lifting off the throttle is clutch slip or wheelspin. Your boost pressure 'spike' is perfectly acceptable too. Last edited by Evo-Paul; 14-08-2018 at 17:39.. |
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#37 | |
Registered User
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Quote:
The engine speed increase as does my road speed. Surely if it was slipping the road speed would not increase?! |
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#38 |
Senior User
![]() Join Date: Apr 2006
Location: Behind a Momo wheel
Car: Red E5
Posts: 3,659
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Haven’t read all the posts. All I will suggest is get a second opinion from another trusted tuner!
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#39 | |
Senior User
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Quote:
I would double check the wg solenoid install and even remove it and run the car with wg plumbed directly to boost source. Sounds like bad 3 port install really.. as for the log you need the specail cable and evoscan to log the ecu parameters..
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#40 |
Moderator
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I'll give everyone a little more info.
The car was run without any wastegate duties, and still spiked, not as bad but the spike was still there. The more boost the more it would do it. The 3 port was then looped so it was not in the system and it still did it. Rom file was changed to eliminate that as well. On looking back over the logs the engine will slur between 3800 rpm and 4100rpm, when put under load it will raise to 4100rpm then fall back/grip to 3850rpm and this can be seen in the logs. I know how the correction works in the ecu and it's impossible for it to cause the engine to slur, it will hold the rpm, not make it go backwards, plus all the corrections where removed.
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#41 |
Senior User
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in that case it is clutch slip... as this is more clear description now than the original post.. maybe logging engine speed/vehicle speed as a calculated channel can identify slip easier..
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#42 | |
Moderator
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Quote:
It is as if the turbo is running mega boost as it comes on then its like it over powers the drivetrain and it's not like it's a long slip, it lasts for 0.5 second, this is why we said could it be a turbo issue as well. The problem is people look for answers, anyone can give advice on the net and say it's clutch, it's turbo this or that, the customer goes and spends 1k on a new clutch and the car still does it, does the net care, I don't think they would as they are not face to face.
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#43 |
Senior User
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what does the log look like.... as in ecu load-boost, etc? Do you see the overboost situation in the log?
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#44 | |
Registered User
Join Date: Dec 2017
Location: Derbyshire
Car: Evo V GSR
Posts: 30
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Quote:
Also never had any clutch smell. Last edited by Evo-Paul; 14-08-2018 at 21:19.. |
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#45 |
Senior User
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Try it in fifth gear from 3000rpm see if it slips when the boost comes in uphill would be good, if it doesn’t slip then by the time it’s at full boost it’s not the clutch.
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