walbro 255 problem

[toyotagt1]

ok before anyone asks iv check all over the forums and haven't found a answer so heres my question. i just got done installing a walbro 255 with a fpr set at 38psi with a rewire kit but when i dive it it has power until the boost kicks in and then it starts acting like its hitting fuel cut so i raised the psi to 45 and still same thing so im lost what is causing this to happen i have a 1g 1990 awd talon

 

[agentorange313]

I think stock 1g fuel should be at 43.5 psi

Are your running stock injectors?

Do you have any logging software? Watching you AFR would be your best bet right now, to see what is happening in your car.

If you are getting fuel cut, your ecu is see too much air.

 

[white92talontsi]

Pressure should be 38 psi.
What boost level? What other mods?
Drop the fuel pressure back to 38.
Is it studdering under boost or what?

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[toyotagt1]

I think stock 1g fuel should be at 43.5 psi

Are your running stock injectors?

Do you have any logging software? Watching you AFR would be your best bet right now, to see what is happening in your car.

If you are getting fuel cut, your ecu is see too much air.

yes im running stock injectors 450 and no i dont have logging software

Pressure should be 38 psi.
What boost level? What other mods?
Drop the fuel pressure back to 38.
Is it studdering under boost or what?

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my boost level is 12psi and i have a full 3in exhasut and a fmic thats about it and yes its studdering under boost

 

[white92talontsi]

yes im running stock injectors 450 and no i dont have logging software



my boost level is 12psi and i have a full 3in exhasut and a fmic thats about it and yes its studdering under boost

Is this 12 Psi possibly creeping since you have a 3" exhaust?


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[toyotagt1]

Is this 12 Psi possibly creeping since you have a 3" exhaust?


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yes it is but its not the exhaust its my internal wastegate the flapper is bad im going to replace it soon with a new mhi evo3 b16g

 

[white92talontsi]

yes it is but its not the exhaust its my internal wastegate the flapper is bad im going to replace it soon with a new mhi evo3 b16g

How is the flapper bad?
Do you have a aftermarket boost gauge?
Manual boost controller?

If your on the stock 14b, running your wastegate off the j-pipe that 12psi can creep on up to almost 20psi by redline. The stock 90 MAF with a 14b will hit fuel cut around 18-19psi.


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[toyotagt1]

How is the flapper bad?
Do you have a aftermarket boost gauge?
Manual boost controller?

If your on the stock 14b, running your wastegate off the j-pipe that 12psi can creep on up to almost 20psi by redline. The stock 90 MAF with a 14b will hit fuel cut around 18-19psi.


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i have a aftermarket boost gauge, a 14b, yes i am running my wastegate off the j-pipe and no it only creeps to 15psi at wot i wont even hit 10psi before my car starts studdering idk whats wrong all i did was install a walbro 255 with rewire with a fpr that i set back to 38psi and still right around 3200rpms it starts studdering like its hitting fuelcut but its not

 

[white92talontsi]

Its either a boost leak then or its too rich.

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[toyotagt1]

Its either a boost leak then or its too rich.

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i did a boost leak everything checks out and im only running 38psi which is stock right so why would it be rich?

 

[MY1GDSM]

The stock fuel maps are extremely rich to begin with... with out a wide-band to know how rich your really are it's hard to say but you'd be surprised what it will do running very rich...

Also, try to only start one thread of your problem you can get confused real quick by doing so an it's generally frowned a pone

 

[toyotagt1]

The stock fuel maps are extremely rich to begin with... with out a wide-band to know how rich your really are it's hard to say but you'd be surprised what it will do running very rich...

Also, try to only start one thread of your problem you can get confused real quick by doing so an it's generally frowned a pone

ok will do and thanks

 

[91darkdsm]

yea man it sounds like your way rich, when it starts to stutter can u ease into it and run it to redline? and u never had this prob before the pump install? i had a very similar prob and ended up being a bad mas, swapped a 2g mas on and it fixed it,may not be ## prob but hope it helps

 

[toyotagt1]

yea man it sounds like your way rich, when it starts to stutter can u ease into it and run it to redline? and u never had this prob before the pump install? i had a very similar prob and ended up being a bad mas, swapped a 2g mas on and it fixed it,may not be ## prob but hope it helps

no i cant even dare get close to redline the whole car starts bucking badly and yes it only started to happen after the install. the next thing i will check will be the mas thanks

 

[1997_GSX]

Do you have an adjustable fuel pressure regulator?