Quick Question on 255 walbro
Apr 30, 2017, 06:17 AM
#1
Quick Question on 255 walbro
Hey everyone,
Sorry for the noob question, but i'm getting a walbro 255 soon.. I was wondering after I installed it, do I need to have the car's tune re-adjusted / retuned or can I just run it was the tune I'm currently on? I currently have a 93 oct. tune by EFI Logics.
Sorry for the noob question, but i'm getting a walbro 255 soon.. I was wondering after I installed it, do I need to have the car's tune re-adjusted / retuned or can I just run it was the tune I'm currently on? I currently have a 93 oct. tune by EFI Logics.
Apr 30, 2017, 06:41 AM
#2
Should retune after a pump install!!! (AFR's will be affected)
Heres 2 threads w/some experienced opinions:
https://www.evolutionm.net/forums/ev...-tuning-2.html
https://www.evolutionm.net/forums/ev...install-2.html
Heres 2 threads w/some experienced opinions:
https://www.evolutionm.net/forums/ev...-tuning-2.html
https://www.evolutionm.net/forums/ev...install-2.html
Last edited by MinusPrevious; Apr 30, 2017 at 06:47 AM.
Apr 30, 2017, 09:38 AM
#3
Should retune after a pump install!!! (AFR's will be affected)
Heres 2 threads w/some experienced opinions:
https://www.evolutionm.net/forums/ev...-tuning-2.html
https://www.evolutionm.net/forums/ev...install-2.html
Heres 2 threads w/some experienced opinions:
https://www.evolutionm.net/forums/ev...-tuning-2.html
https://www.evolutionm.net/forums/ev...install-2.html
Is that the same thing with cams? Thinking of installing cams aswell, not sure if I can drive my car there or not.. 
Apr 30, 2017, 11:16 PM
#7
Account Disabled
If you do the job properly, the AFRs will remain exactly the same. That's because if you do it properly the pressure doesn't change
If you do the job wrong like most on here, the AFRs change.
What you SHOULD be doing is take fuel pressure measurements BEFORE the pump change.
Then take them again after.
The fuel pressure at idle with the vac line ON
The fuel pressure at lidle with the vac line pulled off.
So long as the pressure doesn't change, you won't need a tune.
But you'll need a better flowing FPR to do it.
Then you won't need to ask and you won't get wrong answers.
If you do the job wrong like most on here, the AFRs change.
What you SHOULD be doing is take fuel pressure measurements BEFORE the pump change.
Then take them again after.
The fuel pressure at idle with the vac line ON
The fuel pressure at lidle with the vac line pulled off.
So long as the pressure doesn't change, you won't need a tune.
But you'll need a better flowing FPR to do it.
Then you won't need to ask and you won't get wrong answers.
Trending Topics
May 1, 2017, 12:18 AM
#8
If you do the job properly, the AFRs will remain exactly the same. That's because if you do it properly the pressure doesn't change
If you do the job wrong like most on here, the AFRs change.
What you SHOULD be doing is take fuel pressure measurements BEFORE the pump change.
Then take them again after.
The fuel pressure at idle with the vac line ON
The fuel pressure at lidle with the vac line pulled off.
So long as the pressure doesn't change, you won't need a tune.
But you'll need a better flowing FPR to do it.
Then you won't need to ask and you won't get wrong answers.
If you do the job wrong like most on here, the AFRs change.
What you SHOULD be doing is take fuel pressure measurements BEFORE the pump change.
Then take them again after.
The fuel pressure at idle with the vac line ON
The fuel pressure at lidle with the vac line pulled off.
So long as the pressure doesn't change, you won't need a tune.
But you'll need a better flowing FPR to do it.
Then you won't need to ask and you won't get wrong answers.
May 1, 2017, 12:27 AM
#9
If you do the job properly, the AFRs will remain exactly the same. That's because if you do it properly the pressure doesn't change
If you do the job wrong like most on here, the AFRs change.
What you SHOULD be doing is take fuel pressure measurements BEFORE the pump change.
Then take them again after.
The fuel pressure at idle with the vac line ON
The fuel pressure at lidle with the vac line pulled off.
So long as the pressure doesn't change, you won't need a tune.
But you'll need a better flowing FPR to do it.
Then you won't need to ask and you won't get wrong answers.
If you do the job wrong like most on here, the AFRs change.
What you SHOULD be doing is take fuel pressure measurements BEFORE the pump change.
Then take them again after.
The fuel pressure at idle with the vac line ON
The fuel pressure at lidle with the vac line pulled off.
So long as the pressure doesn't change, you won't need a tune.
But you'll need a better flowing FPR to do it.
Then you won't need to ask and you won't get wrong answers.
May 1, 2017, 01:14 AM
#10
Account Disabled
The correct way to install a pump is to make sure that the pressure IN SPEC afterwards.
That's making sure that it's IN SPEC before modification.
And you've got no idea.
A fuel system with unregulated pressure can't be tuned properly because the pressure changes with electrical load and changes with the weather.
That's making sure that it's IN SPEC before modification.
And you've got no idea.
A fuel system with unregulated pressure can't be tuned properly because the pressure changes with electrical load and changes with the weather.
May 1, 2017, 03:39 PM
#11
EvoM Guru
iTrader: (1)
Do not listen to Fred. Change the pump and drive. The 255 does not over run the stock regulator. So, unless the car was previously tuned and the current pump was running out of flow, you do not need a retune to install a walbro 255.
May 2, 2017, 12:12 AM
#14
Account Disabled
So what you're implying is that the fuel pressure doesn't matter.
The fuel pressure doesn't affect fuel flow through the injectors.
The fuel pressure doesn't affect AFR.
The fuel pressure doesn't affect knock.
The engine won't blow up if you get it wrong.
No fuel pressure gauge required.
Great advice?
May 2, 2017, 06:36 AM
#15
EvoM Guru
iTrader: (1)
So what you're implying is that the fuel pressure doesn't matter.
The fuel pressure doesn't affect fuel flow through the injectors.
The fuel pressure doesn't affect AFR.
The fuel pressure doesn't affect knock.
The engine won't blow up if you get it wrong.
No fuel pressure gauge required.
Great advice?
The fuel pressure doesn't affect fuel flow through the injectors.
The fuel pressure doesn't affect AFR.
The fuel pressure doesn't affect knock.
The engine won't blow up if you get it wrong.
No fuel pressure gauge required.
Great advice?