Im looking at a 2003 evo with a bigger turbo than stock. This will be my first evo so I do not have much experience with the car. THe owner told me he thinks it just needs a tune since it has not been tuned after the upgrades were put on it. I was wondering if anybody had any ideas. I know it has a large turbo, ic, pipes, cams, and I believe headers. All I know is he says it is low boost. Would a tune take care of this issue since it may just not be getting enough fuel for the larger amount of air being forced in?

 

can you get a nice photo of the engine bay, turbo inlet with pipe off?

 

If the car was modded but neglected to get tuned, imagine what other shortcuts might have been made...

 

That doesn't work.


Here's what you will need to do before you attempt to retune anything. Otherwise, like the previous owner, you'll be wasting your time and money.

https://www.evolutionm.net/forums/ev...g-how-why.html

 

Do you have any idea what turbo is on there? Does it have larger injectors and higher volume fuel pump?

 

I do not know what turbo is on it, I know its a larger turbo, I believe I was told hks, it was the one used in the 2014 hyundai genesis commercial, its a decent price which is why im considering it. I am also unable to get pictures of the engine bay. Ill do the boost leakdown test and listen for vacuum leaks. The owner said he got it untuned from the studio, it was bought by universal originally, possibly for the fast and furious movies, so thats kinda a cool bonus. I was thinking a tune could fix based off of a fueling issue since more air would be compressed into the cylinder, leaning it out and causing it not to pull. Is there a way to check boost levels without the gauges in it? thanks for all the replies. Ill let you know if i get the car too.

 

1st of all install a boost gauge.

 

I was planning on t. I just didn't know if there were other ways to check boost of you don't have a gauge

 

You mention that your Evo might have an HKS turbo upgrade. This would probably be the 7460R. If so, it would be relatively simple to corroborate. The 7460 is easy to identify as it has a blue metal plaque on the compressor housing as well as the raised HKS letters cast into the compressor housing.

The earlier versions of this turbo were notorious for losing tension on the wastegate which could be causing your low boost scenario. The problem was due to the cobby looking segmented actuator rod. The problem was supposedly rectified on the later "Kai" versions of this turbo.

 

well I went and looked at the car, its got all sorts of issues. we romped it and pushed 5 lbs of boost, and checked everything else, at idle timing was advanced 30 degrees, so needless to say, it was a dud. thanks for all of your replies though.