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Old 28-08-2014, 18:45   #1
Optimus8
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Boost Problem and engine light on Evo 7

Well guys, I had a thread up about my Evo 7 boost, it's only boosting to 0.7 0.8 max.. Iv looked at the pipes from turbo to actuator to solenoid etc, they all seem fine. What should I eliminate 1st?

The engine light also, had a computer plugged in and what was showing was
P0170 Fuel trim Bank 1

P0400 EGR 'A' Flow

Any ideas or solution on these, thanks 👍
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Old 28-08-2014, 19:01   #2
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how is the boost controlled? standard, boost controller, remapped standard???

for all of the above, could be a knackered actuator. Or else the restrictor in the pipework missing, or in the wrong place. could also be a faulty actuator. 0.8 bar is standard actuator pressure, so i'd guess the actuator is ok, but still needs checking (search on here how to test)

Also, could be a boost leak, is the car standard? had any work done recently?

Stu
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Old 28-08-2014, 19:13   #3
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If you have just got the car I would say its had some kind of boost control on it before and has been removed to sell the car.

The P0170 is most probably the 02 sensor not working and the egr is normal but this can be turned off in the ECU.
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Old 28-08-2014, 20:27   #4
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Thanks guys.. It's standard boost, as far as I know I don't think there was a controller. The car wasn't driven much, only mods on it is a mani and exhaust. It just boosts up to there and no more, and it's not that quick either boosting up :/?
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Old 28-08-2014, 20:30   #5
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I'd agree with Lee, chances are a boost controller has been removed, and put back to standard, incorrectly

Are you attempting to fix this yourself, or taking it to a specialist?

Stu
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Old 28-08-2014, 21:05   #6
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As an aside , but relevant ...you say it was standard boost ...but yet why a boost controller fitted in its past life .....or am I bit stella full
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Old 28-08-2014, 21:24   #7
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Stock boost on an E7 should be around 1.2-1.4 bar, when you remove the stock pipework you remove the boost pill as well and this will only give you 0.7 bar

You only remove the pipework to fit a controller :-)
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Old 28-08-2014, 21:30   #8
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Stock boost on an E7 should be around 1.2-1.4 bar, when you remove the stock pipework you remove the boost pill as well and this will only give you 0.7 bar

You only remove the pipework to fit a controller :-)
Stock near 1.4 .....peak I assume ....
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Old 28-08-2014, 21:58   #9
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The stockboost solenoid is not that great at controlling boost I found.
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Old 29-08-2014, 13:01   #10
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As an aside , but relevant ...you say it was standard boost ...but yet why a boost controller fitted in its past life .....or am I bit stella full
I mean the standard boost setup it's only running 0.7 when it should be 1.2 etc, all pipe work is on and seems ok, iv switched pipes on solenoid and it still runs the boost.
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Old 29-08-2014, 13:48   #11
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Quote:
Originally Posted by Optimus8 View Post
I mean the standard boost setup it's only running 0.7 when it should be 1.2 etc, all pipe work is on and seems ok, iv switched pipes on solenoid and it still runs the boost.
swopping the pipes on the solenoid wont make any difference

if you are going to get your hands dirty, follow the pipe down from the solenoid to the T which then goes off to the actuator and the boost supply nipple. the 2 short pipes that come off the t, you want to have a look in them, or at least give them a squeeze along their length, you are looking for a small solid brass restrictor which is inside the pipe, and if its there, which of those small pipes is it in?

Stu
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Old 29-08-2014, 20:41   #12
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I mean the standard boost setup it's only running 0.7 when it should be 1.2 etc, all pipe work is on and seems ok, iv switched pipes on solenoid and it still runs the boost.
As mentioned , check if restrictor is still in line that's Teed off to turbo/j pipe as without it its .7/.8 bar ...had this issue recently with a mate changing turbos ...
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Old 01-09-2014, 13:58   #13
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Quote:
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swopping the pipes on the solenoid wont make any difference

if you are going to get your hands dirty, follow the pipe down from the solenoid to the T which then goes off to the actuator and the boost supply nipple. the 2 short pipes that come off the t, you want to have a look in them, or at least give them a squeeze along their length, you are looking for a small solid brass restrictor which is inside the pipe, and if its there, which of those small pipes is it in?

Stu
Hi stu,
Iv checked the boost pipes and there is no restrictor in any of them. The pipes are like aftermarket pipes no oem, how will I solve this issue for the pipe to have a restrictor in it to run the right pressure, cheers?
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Old 01-09-2014, 14:29   #14
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Hi stu,
Iv checked the boost pipes and there is no restrictor in any of them. The pipes are like aftermarket pipes no oem, how will I solve this issue for the pipe to have a restrictor in it to run the right pressure, cheers?
Ok, thats a pretty good indicator the car has had a boost controller on it at some point previously

Either get hold of the standard pipework with restrictor (if you do this, make sure the restrictor goes in the right place)

Or fit an aftermarket boost controller

Your choice, depends what you want for the future really

Stu
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Old 01-09-2014, 14:38   #15
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Ok, thats a pretty good indicator the car has had a boost controller on it at some point previously

Either get hold of the standard pipework with restrictor (if you do this, make sure the restrictor goes in the right place)

Or fit an aftermarket boost controller

Your choice, depends what you want for the future really

Stu
Ok, so will I leave the boost as is for now until I get the oem pipe work?
Which is the right place for the restrictor? Just for reference.
I'd more than likely like to keep it standard for another while, cheers?
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