Walbro 255 remap needed?

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01-02-2015, 02:39 PM

Horton

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Walbro 255 remap needed?

My car has the standard fuel pump on it at 120,000 miles I'm thinking I might swap in the walbro 255 I have sitting in my garage just to be safe.

If I do this will I need to get my map adjusted?

Car is a 1.8 turbo with megasquirt and 550cc injectors.

01-02-2015, 02:45 PM

Braineack

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possibly. the base pressure on your fuel rail will increase so you may just need to lower your req_fuel ever so slightly.

01-02-2015, 03:31 PM

Horton

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Ok I'll see if I can get hold of my mapper and ask him.

01-02-2015, 05:32 PM

Savington

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Quote:

Originally Posted by Braineack

possibly. the base pressure on your fuel rail will increase so you may just need to lower your req_fuel ever so slightly.

I'd expect the base pressure to increase at idle, but not at higher RPM. A retune may be required, IMO.

01-03-2015, 11:20 AM

Leafy

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If you can run a proper regulator and set it for the stock base pressure you wont need a re-tune at all. I wouldnt run the wally 255 on the stock regulator. Too many people complain of fluctuating fuel pressure at idle.