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Old 11-02-2015, 06:47 PM   #1
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Codes/pump?

Okay fellas, mods are in the sig.

MPT tuned the car. It has big injectors and with all the mods I think the pump is way over its limits.

I'm getting a couple codes 1 is EGR, MPT forgot to turn it off. Next is a random misfire at multiple cylinders and also random misfire at start up..

But the catch is the codes only pop up from a brake stand burn out or dumping the clutch and hammering it. If I do that once I left off it sputters like its leaning out, then once I slow back to idle and drive it again it stops missing...

Even if I take of hard from a stop and bang thru the gears it still drives fine and doesn't throw the miss codes..

According to the ole interweb the probable causes for the codes are clogged cat, bad injectors, fuel pump, or o2's are bad..

The fuel pump is factory so I'm assuming it's unable to keep up with the demands of the injectors..

Also before you suggest the engines gone, I checked compression all of that is well..

So is this a good pump? Is it a huge improvement over stock?Click image for larger version

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04 GT: CAI, 3.73, Longtubes, Full exhaust, FR500 locker diff, Comp Cams 270's, Short throw, Pullies, BBK 73mm TB, MSD coils, 47lb injectors, MPT tuned, Steeda lowering springs, Front strut bar, MM caster camber plates and the list goes on.
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Old 11-03-2015, 04:44 AM   #2
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None of your mods necessitate injectors as big as you have.. However I doubt your fuel pump is running out of fuel unless you're bumping it off the rev limiter while its sputtering or misfiring. I'd be more willing to be you are having a spark issue under load than anything else. Ignition coils is where I would start.


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Old 11-03-2015, 07:29 AM   #3
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I have MSD coils that are new I'm gonna check plugs first, ill check the pumps duty cycle and see what she's at


04 GT: CAI, 3.73, Longtubes, Full exhaust, FR500 locker diff, Comp Cams 270's, Short throw, Pullies, BBK 73mm TB, MSD coils, 47lb injectors, MPT tuned, Steeda lowering springs, Front strut bar, MM caster camber plates and the list goes on.
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Old 11-03-2015, 08:21 AM   #4
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TU229HP-2 is the same as the bbk fuel pump and half the price. I'm running this pump. I'm at 400 whp and 47lb injectors... I have a boost a pump installed also but probably not needed


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Old 11-03-2015, 11:24 AM   #5
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That walbro pump does 255lph and the BBK does 300lph? That's not the same lol


04 GT: CAI, 3.73, Longtubes, Full exhaust, FR500 locker diff, Comp Cams 270's, Short throw, Pullies, BBK 73mm TB, MSD coils, 47lb injectors, MPT tuned, Steeda lowering springs, Front strut bar, MM caster camber plates and the list goes on.
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Old 11-03-2015, 03:13 PM   #6
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Quote:
Originally Posted by keeney35 View Post
That walbro pump does 255lph and the BBK does 300lph? That's not the same lol


04 GT: CAI, 3.73, Longtubes, Full exhaust, FR500 locker diff, Comp Cams 270's, Short throw, Pullies, BBK 73mm TB, MSD coils, 47lb injectors, MPT tuned, Steeda lowering springs, Front strut bar, MM caster camber plates and the list goes on.

Who do you think bbk gets their pumps from. From my understanding they buy theirs from walbro. Very few companies make their own parts but buy them from other companies. Either way it's more then enough pump then you need and about double what your stock pump is rated for


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Old 11-03-2015, 03:17 PM   #7
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Click image for larger version

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Also depends on which site you look at for the specs 😘


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Old 11-03-2015, 03:30 PM   #8
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Codes/pump?

What is the stock pump rated at?
I checked all data but couldn't find a definite answer

04 GT: CAI, 3.73, Longtubes, Full exhaust, FR500 locker diff, Comp Cams 270's, Short throw, Pullies, BBK 73mm TB, MSD coils, 47lb injectors, MPT tuned, Steeda lowering springs, Front strut bar, MM caster camber plates and the list goes on.
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Old 11-03-2015, 03:37 PM   #9
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When I was buying everything for my supercharger setup I researched this for awhile although I never found a definitive answer 115 lph is what I seen repeated by several different engine builders. And makes sense because a stock pump with a boost a pump is good for around 400whp give or take and depending on the car


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Old 11-03-2015, 04:09 PM   #10
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I'll test the pump on the peko to see what's going on and more than likely go ahead and get that pump then


04 GT: CAI, 3.73, Longtubes, Full exhaust, FR500 locker diff, Comp Cams 270's, Short throw, Pullies, BBK 73mm TB, MSD coils, 47lb injectors, MPT tuned, Steeda lowering springs, Front strut bar, MM caster camber plates and the list goes on.
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