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E7 Boost Issues

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Started by mick4g, Jun 03 2011 11:24 AM

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13 replies to this topic

#1
mick4g
Posted 03 June 2011 - 11:24 AM

mick4g

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Just a technical issue I have found with my car. Ive raised the issue on another forum but havent identified the direct cause. In the higher end of 4th gear from roughly 4200rpm and above the boost feels like its coming in the rpm range in waves. Off and on type of thing with the foot flat. Im thinking its time for a boost leak check, get some form of tune into it?

Thoughts and ideas are greatly appreciated

Cheers

#2
DOUGMO
Posted 03 June 2011 - 11:36 AM

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do you have a boost controller fitted, what boost are you running?

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#3
bazeng
Posted 03 June 2011 - 01:57 PM

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Surge? Low revs / high boost.. Sound like a chopper?

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#4
Chaser
Posted 03 June 2011 - 02:02 PM

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my wife's 7 gta does the same thing all the time, i think its just how the stock tune is?
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#5
Dean
Posted 03 June 2011 - 11:09 PM

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Fuel Pump + EBC + Tune will do the trick
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#6
mick4g
Posted 04 June 2011 - 05:51 AM

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Thanks for the replies guys. Its got a boost controller in there but running factory boost atm. Im beginning to think that its the stock tune also. See how it fairs with 18psi put through it when I do the remap

BAZENG: only in the high revs, low revs through the boost curve is beautiful for a stocker, nice and smooth

#7
ONPSI
Posted 04 June 2011 - 07:05 AM

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Do a boost leak check otherwise throw it on a dyno should find the prob straight away
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#8
DOUGMO
Posted 04 June 2011 - 10:19 AM

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if its only in higer gears at higher revs on a stock boost setting its probably the controller trying to
keep the boost under control. if you want to run stock boost for the moment your better to have it switched off.

Maybe try it with the controller off and see if it still does it.(in a controlled legal environment of course)

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#9
mick4g
Posted 05 June 2011 - 01:21 AM

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Thanks mate, Ill give it a go. Might try a lower boost seeting on the controller and see what it does, then try with it off completely

Cheers!

#10
Jonson
Posted 05 June 2011 - 10:07 PM

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Ignition misfire? Does it feel severe or just noticeable?
Jon - Evo VII. Previous cars: Evo VI, Evo VIII, Legnum, E39a VR4, Cordia GSR's. Owner of Driven Motorsport - Adelaide.

#11
mick4g
Posted 06 June 2011 - 07:56 AM

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Ignition misfire? Does it feel severe or just noticeable?



Its not severe as such. Noticable yes but nothing crazy. The engine has iridium tipped after market sparkies also

#12
Jonson
Posted 07 June 2011 - 08:27 AM

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Plug gaps? Heat range?
Jon - Evo VII. Previous cars: Evo VI, Evo VIII, Legnum, E39a VR4, Cordia GSR's. Owner of Driven Motorsport - Adelaide.

#13
mick4g
Posted 08 June 2011 - 04:37 AM

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Plug gaps? Heat range?



Havent checked the gaps, think the old boys got the spark plug gap measuring tool. Might check that out too. What's an ideal gap for the plugs?

#14
mick4g
Posted 12 September 2011 - 11:23 AM

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Ended up being the stock Turbo Actuator was blown and leaking. All good now, replaced with a 1.5 bar actuator complete with the metal cap featured on the VIII MR & 9 actuator asourced from GT pumps
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