Do you need to get a retune after installing a Walbro 255 on a Evo IX or it wont hurt to run with the old tune?

 

You will need a different tune!

 

Yup, more fuel. It will make your current tune run rich.

 

If your'e staying on the stock turbo, you don't need a Walbro. You're IX pump is fine.

Eric

 

^^yes but I heard it adds like 20 more tq??? Not sure how true that is.

 

A fuel pump doesn't add torque. Who told you that?

A fuel pump just has to be able to flow enough fuel for the amount of air you will be pushing in accordance with what AFR you will be running. Since the stock turbo won't push much more than about 43lb/min, the IX pump is enough.


Eric

 

The Walbro is a safety mod. If you want to make big power, it becomes a necessity. Your injectors, rail, and regulator are still the same, so fuel shouldn't really change after installing a Walbro... ie, you shouldn't all of a sudden run rich.

 

NO , u don't need a tune , because of the pump

 

Yes you need to do a Retune. and this has been discussed alot ! ..