Boost a pump/fuel question
Thread Starter
Race Director
Joined: Mar 2001
Posts: 10,030
Likes: 10
From: Prescott AZ
St. Jude Donor '04
Boost a pump/fuel question
Picked up another C5 today. It has a A&A p1sc kit on it and whenever you get into boost the car starts popping from the exhaust. The guy I bought it from says it needs a new fuel pump and filter. The car runs fine when it's not in boost but as soon you even get to 1 psi you can here the popping.
I am thinking the car needs a boost a pump setup.
Any ideas?
I am thinking the car needs a boost a pump setup.
Any ideas?
Former Vendor
Joined: Dec 2006
Posts: 2,239
Likes: 1
Picked up another C5 today. It has a A&A p1sc kit on it and whenever you get into boost the car starts popping from the exhaust. The guy I bought it from says it needs a new fuel pump and filter. The car runs fine when it's not in boost but as soon you even get to 1 psi you can here the popping.
I am thinking the car needs a boost a pump setup.
Any ideas?
I am thinking the car needs a boost a pump setup.
Any ideas?
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Sounds to me like a tunning issue! Almost as if the timing is to far advanced at the low end or under "BOOST".
I'd take a day and take her over to a GOOD tuner and have it checked out and perhaps retunned as needed!
This will be your best investment on your new Vette right away!
If you were running out of fuel you will be running lean and very hot to the point that it could and will DETONATE! Under load!
Have you checked the plugs to see if the grounding strap or arm is there? or how the plugs look - Lean or Rich?
A BAP will increase the fuel pressure under load but it needs to Boost for it to work!
Let us know!
Thanks,Matt
I'd take a day and take her over to a GOOD tuner and have it checked out and perhaps retunned as needed!
This will be your best investment on your new Vette right away!
If you were running out of fuel you will be running lean and very hot to the point that it could and will DETONATE! Under load!
Have you checked the plugs to see if the grounding strap or arm is there? or how the plugs look - Lean or Rich?
A BAP will increase the fuel pressure under load but it needs to Boost for it to work!
Let us know!
Thanks,Matt
Thread Starter
Race Director
Joined: Mar 2001
Posts: 10,030
Likes: 10
From: Prescott AZ
St. Jude Donor '04
According to the guy I bought it off of he had a tuner relook at it. This car was running fine up until this starting happening and they say it is a fuel pump issue. Could it be just a fuel filter?
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Can you take it back to the so called tuner who has worked on it?
Well it wouldn't hurt to replace the fuel filter! Should only take a few minutes to do!
Mine too is done as a speed density or 2 Bar set-up!
Does it have a fuel pressure guage in it? so you can see if it is dropping down when under B@@ST?
Does it have a Air Fuel Ratio Gauge? This will help in seeing if it is going lean!
If it does not have a BAP with this set-up then it should have one and I'd pick up a MAGNAVOLT BAP, it is what I'm running too plus it's easy to hook up and it'll go right into the battery box area!
It is also a simple job to replace the fuel pump, it's right behind the drivers rear tire. Just pull the rim and the cover panel over the tank and remove the pump but make sure you remove the float first so it'll come out! Once your there doing it you'll know what I mean!
How far are you from the San Fernando Valley?
Thanks,Matt
Well it wouldn't hurt to replace the fuel filter! Should only take a few minutes to do!
Mine too is done as a speed density or 2 Bar set-up!
Does it have a fuel pressure guage in it? so you can see if it is dropping down when under B@@ST?
Does it have a Air Fuel Ratio Gauge? This will help in seeing if it is going lean!
If it does not have a BAP with this set-up then it should have one and I'd pick up a MAGNAVOLT BAP, it is what I'm running too plus it's easy to hook up and it'll go right into the battery box area!
It is also a simple job to replace the fuel pump, it's right behind the drivers rear tire. Just pull the rim and the cover panel over the tank and remove the pump but make sure you remove the float first so it'll come out! Once your there doing it you'll know what I mean!
How far are you from the San Fernando Valley?
Thanks,Matt
Thread Starter
Race Director
Joined: Mar 2001
Posts: 10,030
Likes: 10
From: Prescott AZ
St. Jude Donor '04
Can you take it back to the so called tuner who has worked on it?
Well it wouldn't hurt to replace the fuel filter! Should only take a few minutes to do!
Mine too is done as a speed density or 2 Bar set-up!
Does it have a fuel pressure guage in it? so you can see if it is dropping down when under B@@ST?
Does it have a Air Fuel Ratio Gauge? This will help in seeing if it is going lean!
If it does not have a BAP with this set-up then it should have one and I'd pick up a MAGNAVOLT BAP, it is what I'm running too plus it's easy to hook up and it'll go right into the battery box area!
It is also a simple job to replace the fuel pump, it's right behind the drivers rear tire. Just pull the rim and the cover panel over the tank and remove the pump but make sure you remove the float first so it'll come out! Once your there doing it you'll know what I mean!
How far are you from the San Fernando Valley?
Thanks,Matt
Well it wouldn't hurt to replace the fuel filter! Should only take a few minutes to do!
Mine too is done as a speed density or 2 Bar set-up!
Does it have a fuel pressure guage in it? so you can see if it is dropping down when under B@@ST?
Does it have a Air Fuel Ratio Gauge? This will help in seeing if it is going lean!
If it does not have a BAP with this set-up then it should have one and I'd pick up a MAGNAVOLT BAP, it is what I'm running too plus it's easy to hook up and it'll go right into the battery box area!
It is also a simple job to replace the fuel pump, it's right behind the drivers rear tire. Just pull the rim and the cover panel over the tank and remove the pump but make sure you remove the float first so it'll come out! Once your there doing it you'll know what I mean!
How far are you from the San Fernando Valley?
Thanks,Matt
Nope on the air fuel meter
The main reason I ask is I bought this donor car with intentions of of swapping it out into my 97 coupe but there a few things I wanted to ask about the setup before I uninstalled it. This car is a A4 mine is a M6 not that is matters. I have Efi Live and I was going to drop this tune in but I am now having second thought about doing that. I
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Nope on the fuel pressure gauge
Nope on the air fuel meter
The main reason I ask is I bought this donor car with intentions of of swapping it out into my 97 coupe but there a few things I wanted to ask about the setup before I uninstalled it. This car is a A4 mine is a M6 not that is matters. I have Efi Live and I was going to drop this tune in but I am now having second thought about doing that. I
Nope on the air fuel meter
The main reason I ask is I bought this donor car with intentions of of swapping it out into my 97 coupe but there a few things I wanted to ask about the setup before I uninstalled it. This car is a A4 mine is a M6 not that is matters. I have Efi Live and I was going to drop this tune in but I am now having second thought about doing that. I
Did you check to see if the fuel system has a BAP or not already? It will either be in the Battery compartment area or behind the drivers rear wheel under the wheel well panel! All might be good just need to find out why it is popping under load!
Again it could be timing too!
Thanks,Matt
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Thread Starter
Race Director
Joined: Mar 2001
Posts: 10,030
Likes: 10
From: Prescott AZ
St. Jude Donor '04
What about taking your fuel pump and dropping it in the Doner for now to see if it is the pump or something else?
Did you check to see if the fuel system has a BAP or not already? It will either be in the Battery compartment area or behind the drivers rear wheel under the wheel well panel! All might be good just need to find out why it is popping under load!
Again it could be timing too!
Thanks,Matt
Did you check to see if the fuel system has a BAP or not already? It will either be in the Battery compartment area or behind the drivers rear wheel under the wheel well panel! All might be good just need to find out why it is popping under load!
Again it could be timing too!
Thanks,Matt
Did'nt see a BAP anyware. I wasn't sure on a 97 if you really had to have one or not.
Do you have EFI live if so I could email you the tune file.
Thanks for your help. This donor car I bought is my 8th C5 but I am new to the F/I part
Melting Slicks
Joined: Nov 2004
Posts: 2,715
Likes: 0
From: Tinker till it blows... then back it off a notch, maybe!!
St. Jude Donor '08
One big thing. The car is showing P0103 code. It is set to emission only but the code still shows on the computer. Does that take it out of speed denisity mode?
Did'nt see a BAP anyware. I wasn't sure on a 97 if you really had to have one or not.
Do you have EFI live if so I could email you the tune file.
Thanks for your help. This donor car I bought is my 8th C5 but I am new to the F/I part
Did'nt see a BAP anyware. I wasn't sure on a 97 if you really had to have one or not.
Do you have EFI live if so I could email you the tune file.
Thanks for your help. This donor car I bought is my 8th C5 but I am new to the F/I part
Thread Starter
Race Director
Joined: Mar 2001
Posts: 10,030
Likes: 10
From: Prescott AZ
St. Jude Donor '04
Ok took the blower setup off today. At this point I guess I don't care how it was on the auto. I just hope the auto still runs decent when I put it all back to the N/A. I will probley do some sort of Boostapump setup on my car. Honestly I crappy car out of my garage 
Last edited by Wicked C5; Oct 10, 2007 at 07:56 PM.
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
One big thing. The car is showing P0103 code. It is set to emission only but the code still shows on the computer. Does that take it out of speed denisity mode?
Did'nt see a BAP anyware. I wasn't sure on a 97 if you really had to have one or not.
Do you have EFI live if so I could email you the tune file.
Thanks for your help. This donor car I bought is my 8th C5 but I am new to the F/I part
Did'nt see a BAP anyware. I wasn't sure on a 97 if you really had to have one or not.
Do you have EFI live if so I could email you the tune file.
Thanks for your help. This donor car I bought is my 8th C5 but I am new to the F/I part
A BAP is necessary to your set-up! It should run fine on the A4!
As stated above your P0103 Code is normal! Wont turn anything off with the SD!
Are you changing everything out of the Doner to your current set-up! I still don't have the complete picture yet as to your project!
Thanks,Matt
Thread Starter
Race Director
Joined: Mar 2001
Posts: 10,030
Likes: 10
From: Prescott AZ
St. Jude Donor '04
The Donor has a Fast 90 and ls2 throttle body and 42lbs injectors. I am thinking about selling it and picking up a Ls2 Intake and use the difference for the tune.
Only a couple of other things I need to pull such as the LG long tubes and pipes and the rotors.
