For those of you that think you dont need a retune after a fp install!
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From: Lake Mary,FL
For those of you that think you dont need a retune after a fp install!
My car was tuned last week and the a/f was around 11.5-11.6.. I had a Walboro put in and the car ran like crap.. Came to find out last night when my car was logged that the a/f dipped to 10.3!!!! I got the car retuned last night back to 11.5 across the powerband... Just wanted to share this info with everyone bc it seems alot of ppl here dont think installing a fuel pump will mess your A/F
Scott if you read this, can you please post the a/f reading after the first pull?
Scott if you read this, can you please post the a/f reading after the first pull?
i don't think you read the results from the last post did you.
we came to the conclusion that you NEED a pump BEFORE a tune. you broke the golden rule... you got a tune before a pump. thus you had your car tuned for a maxed out pump when fuel pressures were not sufficient up top... i.e. it was leaning out and you had to increase duty cycles to compensate for a MAXED OUT fuel pump. then when you put in a pump that wasn't maxed out fuel pressures remained consistant, and sense you had already tuned it for a wimpy pump, it ran rich.
its kinda like having a massive boost leak and tuning the car that way. when you fix the boost leak, the car will run lean. therefor, you should check for boost leaks before you tune the car. tuning around a problem just means when you fix the problem your gonna have to do it again.
if only you had logged fuel pressure i could have proven my point... i'll have to hook up a fuel pressure sensor onto my zeitronix system just for kicks, then get a stock pump and run it against a walboro.
we came to the conclusion that you NEED a pump BEFORE a tune. you broke the golden rule... you got a tune before a pump. thus you had your car tuned for a maxed out pump when fuel pressures were not sufficient up top... i.e. it was leaning out and you had to increase duty cycles to compensate for a MAXED OUT fuel pump. then when you put in a pump that wasn't maxed out fuel pressures remained consistant, and sense you had already tuned it for a wimpy pump, it ran rich.
its kinda like having a massive boost leak and tuning the car that way. when you fix the boost leak, the car will run lean. therefor, you should check for boost leaks before you tune the car. tuning around a problem just means when you fix the problem your gonna have to do it again.
if only you had logged fuel pressure i could have proven my point... i'll have to hook up a fuel pressure sensor onto my zeitronix system just for kicks, then get a stock pump and run it against a walboro.
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From: Lake Mary,FL
Originally Posted by KevinD
i don't think you read the results from the last post did you.
we came to the conclusion that you NEED a pump BEFORE a tune. you broke the golden rule... you got a tune before a pump. thus you had your car tuned for a maxed out pump when fuel pressures were not sufficient up top... i.e. it was leaning out and you had to increase duty cycles to compensate for a MAXED OUT fuel pump. then when you put in a pump that wasn't maxed out fuel pressures remained consistant, and sense you had already tuned it for a wimpy pump, it ran rich.
its kinda like having a massive boost leak and tuning the car that way. when you fix the boost leak, the car will run lean. therefor, you should check for boost leaks before you tune the car. tuning around a problem just means when you fix the problem your gonna have to do it again.
if only you had logged fuel pressure i could have proven my point... i'll have to hook up a fuel pressure sensor onto my zeitronix system just for kicks, then get a stock pump and run it against a walboro.
we came to the conclusion that you NEED a pump BEFORE a tune. you broke the golden rule... you got a tune before a pump. thus you had your car tuned for a maxed out pump when fuel pressures were not sufficient up top... i.e. it was leaning out and you had to increase duty cycles to compensate for a MAXED OUT fuel pump. then when you put in a pump that wasn't maxed out fuel pressures remained consistant, and sense you had already tuned it for a wimpy pump, it ran rich.
its kinda like having a massive boost leak and tuning the car that way. when you fix the boost leak, the car will run lean. therefor, you should check for boost leaks before you tune the car. tuning around a problem just means when you fix the problem your gonna have to do it again.
if only you had logged fuel pressure i could have proven my point... i'll have to hook up a fuel pressure sensor onto my zeitronix system just for kicks, then get a stock pump and run it against a walboro.
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From: Lake Mary,FL
Originally Posted by ibanez_926
Did you miss the thousands of threads in the past related to this exact subject?
Originally Posted by EVIL_EVO_VIII
I see your point but i know it was also my mistake not to put the pump in before the tune..I made the thread for those out there that have gotten tuned already but havent installed a Walboro so they can see from my results that they WILL need to get retuned after the new pump install
so lets make the golden rule of fuel pumps like this:
1. get a bigger fuel pump Before you get your first tune
2. if you already had a tune with a stock fuel pump, you will need another tune if you put in a walboro.
3. if you are stock, and add a walboro, you don't need a tune (someone needs to verify if the stock pump runs out of pressure completely stock... i can do this if i can find a car that is stock.)
sound good?
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From: Lake Mary,FL
Originally Posted by KevinD
fair enough.
so lets make the golden rule of fuel pumps like this:
1. get a bigger fuel pump Before you get your first tune
2. if you already had a tune with a stock fuel pump, you will need another tune if you put in a walboro.
3. if you are stock, and add a walboro, you don't need a tune (someone needs to verify if the stock pump runs out of pressure completely stock... i can do this if i can find a car that is stock.)
sound good?
so lets make the golden rule of fuel pumps like this:
1. get a bigger fuel pump Before you get your first tune
2. if you already had a tune with a stock fuel pump, you will need another tune if you put in a walboro.
3. if you are stock, and add a walboro, you don't need a tune (someone needs to verify if the stock pump runs out of pressure completely stock... i can do this if i can find a car that is stock.)
sound good?
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From: Davidson, NC
When someone says you "need" a retune I interpret that as without a tune you are at high risk of damaging the car by driving it. In the case of a fuel pump the car goes rich which is safe and therefore I wouldn't say you "need" a retune. I would say you should retune if you expect to maintain optimum efficiency.
The pump puts you back to stock like AFR's in this particular case.
The need is the "need" to put the pump in before the tune and do it once.
I was unaware the stock pump was in the car still until 85% of the original tune was completed.
The need is the "need" to put the pump in before the tune and do it once.
I was unaware the stock pump was in the car still until 85% of the original tune was completed.
Originally Posted by EVIL_EVO_VIII
Well i made the thread for info purposes for those that DONT know and dont make the same mistake, specially the newbies!!
