My evo v what should it boost to standard

[mk2 mat]

Hi, just bought an evo v, don't really know much about it, but it has got a few little extras, ie hks intake, exhuast etc, my peak boost, on boost gauge is only 0.6, what would be the standard boost for this car as it doesn't feel as quick as I thought it should be, thanks Matthew

[AJI]

about 0.9

Look for splits in your pipework. Or loose connections.


Or it could be that your boost control is set for 0.6max.

Edited by AJI on Thursday 21st January 13:29

[mk2 mat]

Thanks, this may sound silly but how would I adjust the boost, as I have checked all pipe work and fitted a new intercooler!
Regards mat

[AJI]

Well this would depend on which boost controller you have.

Just type your model of boost controller into google along with the words 'instructions' or 'adjusting boost level' and you should come across some helpful info.



If not pipe-work or boost controller then maybe a leak in your intercooler.

[mk2 mat]

Uuum! Another silly question where would I find the boost controler, or may i might not have one?
Thanks mat

[mrmr96]

The standard car uses the ECU to control the boost, so there won't be anything to find.
If you have an aftermarket boost controller then there are basically 2 types:
- Mechanical/Dawes device. This will be fitting into the vacuum hose from the inlet manifold to the wastegate actuator.
- Electronic. This will be a display with buttons fitted somewhere in the cabin. Usually mounted on the dash, or near the stereo, or the ash tray, of the coin tray, or the glove box.

The boost can therefore be controlled by the ECU, or a mechanical boost controller (in combination with the ECU) or with a standalone aftermarket controller. Any of these could cause low boost if set incorrectly. However there may also be a leak in the pipework.

If you've fitted a new intercooler I'd check and recheck the hoses for leaks. It is possible to perform a leak test by blocking off the hoses to the turbo and inlet manifold and then pressurising the pipework.

[mrmr96]

PS - get over to the MLR at www.lancerregister.com (the home of Evo's in the UK) or www.geekmapped.com (a website dedicated to home tuning/mechanics focussed on Evo's - setup by MLR members.)

[mk2 mat]

Thank you very much for your help, if there was a leak in the pipe work would the car make some sort of whistling noise whilst on boost, but I've checked every where this mornin, and it ain't looking like i have a boost controler, so I suppose it can only be the pipework that I have allready spent endless hours checking over. Haha
thanks mat

[mk2 mat]

Another question could this be anything to do with the actuator, as on inspection it seems to have a new turbo and forge actuator could this be miss adjusted or is it not adjustable?
Thanks mat

[AJI]

mk2 mat said:

Thank you very much for your help, if there was a leak in the pipe work would the car make some sort of whistling noise whilst on boost, but I've checked every where this mornin, and it ain't looking like i have a boost controler, so I suppose it can only be the pipework that I have allready spent endless hours checking over. Haha
thanks mat

if you're sure its not pipework then next check is your intercooler.
A small crack in the casing or the internals would mean air is leaking out of the system.

A pressure check on the intercooler would find any leaks.
One method is to buy a cheap motorcycle innertube and then cut it somewhere in the middle.
Attach each end of the innertube to each side of the intercooler and then simply use a bike pump to create the pressure.
You should be able to hear the air leaking out, or if not then most bike pumps have a pressure guage on them....leave the connected innertube for about 10mins and come back later to see if any significant pressure drop.

[mrmr96]

I doubt you could hear the air leak whilst driving. Remember it will only leak while on boost, and when that's happening there's so many other sucky/whoosy/blowy noises I think you'd be hard pressed to pick up the leak.

Yes, it could be related to the actuator or turbo too.

There's a LOT of things which could potentially be causing low boost. You'll get more expert opinion on the two websites I linked to earlier.