Case Study - Stock IX Fuel Pump
Sep 6, 2006, 08:09 PM
#1
Account Disabled
Thread Starter
iTrader: (91)
Join Date: Sep 2003
Location: 2003 Evo VIII - Silver
Posts: 16,850
Likes: 0
Received 0 Likes
on
0 Posts
Case Study - Stock IX Fuel Pump
Recently, I had a customer who posted a dyno sheet from a eflash tune I had made which looked odd to me as it was going lean towards 7,000 rpms
We are taling about a car with a down pipe - intake and evc ebc - 2006 IX.
I decided to offer him a refund on the eflash if he would get a custom tune when I was in LA as I suspected that he had a weak stock fuel pump
Some quick addition of injector duty cycle in the higher rpm zone had no effect on the a/f at 7,000 and beyond
I maxed out the fuel map after 7,000 and the car was still going lean on the high rpm zone
You can see from the attached data log that the fuel is going lean despite the fuel map being maxed out
Obviously the stock fuel pump is over heating and the flow is not able to keep up with damands
We are taling about a car with a down pipe - intake and evc ebc - 2006 IX.
I decided to offer him a refund on the eflash if he would get a custom tune when I was in LA as I suspected that he had a weak stock fuel pump
Some quick addition of injector duty cycle in the higher rpm zone had no effect on the a/f at 7,000 and beyond
I maxed out the fuel map after 7,000 and the car was still going lean on the high rpm zone
You can see from the attached data log that the fuel is going lean despite the fuel map being maxed out
Obviously the stock fuel pump is over heating and the flow is not able to keep up with damands
Last edited by DynoFlash; Sep 6, 2006 at 08:15 PM.
Sep 6, 2006, 08:22 PM
#2
Account Disabled
Thread Starter
iTrader: (91)
Join Date: Sep 2003
Location: 2003 Evo VIII - Silver
Posts: 16,850
Likes: 0
Received 0 Likes
on
0 Posts
Now ALL I did was install the Walbro fuel pump - BTW I discovred that the stock pump was hot as heck when I removed it
Look at what effect the walbro pump has on the a/f - with the same map settings now there is enough fuel to dump the a/f super rich at 7,000 rpms and above
Look at what effect the walbro pump has on the a/f - with the same map settings now there is enough fuel to dump the a/f super rich at 7,000 rpms and above
Last edited by DynoFlash; Sep 6, 2006 at 08:25 PM.
Sep 6, 2006, 08:28 PM
#3
Sounds like a faulty fuel pump or a leaking FPR line.
You should not have trouble at ONLY 19-20psi.
In this case, the pump WOULD be working hard, but the FPR line would not be forcing the pressure through the injectors. If you are logging boost I am assuming you tapped the FPR line. Maybe it was not a good connection?
Al you need to work on your image resizing skills. This is very hard to navigate for members and I have a 17" monitor.
You should not have trouble at ONLY 19-20psi.
In this case, the pump WOULD be working hard, but the FPR line would not be forcing the pressure through the injectors. If you are logging boost I am assuming you tapped the FPR line. Maybe it was not a good connection?
Al you need to work on your image resizing skills. This is very hard to navigate for members and I have a 17" monitor.
Last edited by TTP Engineering; Sep 6, 2006 at 08:32 PM.
Sep 6, 2006, 08:29 PM
#4
Account Disabled
Thread Starter
iTrader: (91)
Join Date: Sep 2003
Location: 2003 Evo VIII - Silver
Posts: 16,850
Likes: 0
Received 0 Likes
on
0 Posts
A few more adjustments later and we have a nice stable 11.1/1 a/f with repeatable and constant fuel delivery pass after pass
This is why no one who is modifying an evo should neglect a fuel pump upgrade as part of the package
Thanks
AL
This is why no one who is modifying an evo should neglect a fuel pump upgrade as part of the package
Thanks
AL
Sep 6, 2006, 08:31 PM
#5
Account Disabled
Thread Starter
iTrader: (91)
Join Date: Sep 2003
Location: 2003 Evo VIII - Silver
Posts: 16,850
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by TTP Engineering
Sounds like a faulty fuel pump or a leaking FPR line.
You should not have trouble at ONLY 19-20psi.
You should not have trouble at ONLY 19-20psi.
I agree - we have seen many stock pumps fail
The problem is that they do not fail by stopping to work 100% - they fail by slowly loosing pressure
From what I have seen - hot climates and low fuel levels are aggrivating factors
Sep 6, 2006, 08:47 PM
#6
Evolving Member
iTrader: (13)
Join Date: Jul 2006
Location: Colorado
Posts: 491
Likes: 0
Received 0 Likes
on
0 Posts
I sure am glad that I called and asked you about the fuel pump then Al! I sent my ECU yesterday so I will be looking forward to getting it tommorow back in Colorado! Hope everything went well!
Trending Topics
Sep 6, 2006, 10:08 PM
#8
Originally Posted by Ion619
This may be a dumb question, but what if your stock and just had a flash.. do you still recommend a fuel pump upgrade?
Sep 6, 2006, 11:16 PM
#11
I guess your talking about me.....Well I only have a catback.intake,hks evc...No downpipe....
I did some A/F logs and they where in the 11.50 11.60 weather temp outside 71!!
And did some evoscan logs and there's Knock...
I did some A/F logs and they where in the 11.50 11.60 weather temp outside 71!!
And did some evoscan logs and there's Knock...
Last edited by ant_turbo; Sep 6, 2006 at 11:20 PM.
Sep 6, 2006, 11:30 PM
#12
Originally Posted by ant_turbo
I guess your talking about me.....Well I only have a catback.intake,hks evc...No downpipe....
I did some A/F logs and they where in the 11.50 11.60 weather temp outside 71!!
And did some evoscan logs and there's Knock...
I did some A/F logs and they where in the 11.50 11.60 weather temp outside 71!!
And did some evoscan logs and there's Knock...
Sep 7, 2006, 07:53 AM
#15
Evolved Member
iTrader: (5)
Join Date: Jan 2006
Location: Dirrrty Jerzey
Posts: 1,150
Likes: 0
Received 0 Likes
on
0 Posts
i hope this is no the case with every IX fuel pump
how much richer did the afr get with just the fuel pump addition?
did it go pig rich as I cant tell with the post
thanks
how much richer did the afr get with just the fuel pump addition?
did it go pig rich as I cant tell with the post
thanks