bad fuel pump? B1 cam/ hooker header dyno inside...
Thread Starter
Joined: Nov 2001
Posts: 1,794
Likes: 1
From: Slate Hill, NY
bad fuel pump? B1 cam/ hooker header dyno inside... We baselined my car and got 375 hp and 355.5 TQ. TQ curve made over 300 lbs/ft between 2600 and 6000 rpm's. HP peaked at 6300.
after LS1edit, car made 385.6 hp and 364.9 TQ. nice smooth graph.
but alas, all is not rosey....the wideband was showing a lean condition starting at 6000. they hooked up the fuel pressure gauge and made more pulls. the pressure was 60 lbs, but dropped to mid 40's at around 5700 rpm and up. atap showed the injector pulse static (wide open) at 20. they quickly changed out the fuel filter just to make sure.....no dice. julio says the pump isn't keeping up; must be bad. time to go to the dealer to get a new fuel pump. i hope that cures it.
Julio says the injectors are good for up to 400 hp, so that shouldn't be an issue.
i can't find the power cord for my scanner so i'll try to get the graph's on the net as soon as possible.
hoping for low 12's this saturday (drag radials, 17's in front)....even with the low fuel pressure...juilio said i can run it, but not to normal rev limit.
after LS1edit, car made 385.6 hp and 364.9 TQ. nice smooth graph.
but alas, all is not rosey....the wideband was showing a lean condition starting at 6000. they hooked up the fuel pressure gauge and made more pulls. the pressure was 60 lbs, but dropped to mid 40's at around 5700 rpm and up. atap showed the injector pulse static (wide open) at 20. they quickly changed out the fuel filter just to make sure.....no dice. julio says the pump isn't keeping up; must be bad. time to go to the dealer to get a new fuel pump. i hope that cures it.
Julio says the injectors are good for up to 400 hp, so that shouldn't be an issue.
i can't find the power cord for my scanner so i'll try to get the graph's on the net as soon as possible.
hoping for low 12's this saturday (drag radials, 17's in front)....even with the low fuel pressure...juilio said i can run it, but not to normal rev limit.
TECH Senior Member
Joined: Nov 2001
Posts: 10,341
Likes: 1
Re: bad fuel pump? B1 cam/ hooker header dyno inside... Yep sounds like the pump.
Throw in a new one and your laughing <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Cheers,
Chris
ps- Good numbers BTW <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Throw in a new one and your laughing <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Cheers,
Chris
ps- Good numbers BTW <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Re: bad fuel pump? B1 cam/ hooker header dyno inside... My stock fuel pump was going below 40psi at WOT... I replaced it.
I would not bother racing with a dying fuel pump personally, you can just go lean and heck it might even conk out on ya.
I would not bother racing with a dying fuel pump personally, you can just go lean and heck it might even conk out on ya.
Thread Starter
Joined: Nov 2001
Posts: 1,794
Likes: 1
From: Slate Hill, NY
Re: bad fuel pump? B1 cam/ hooker header dyno inside... thanx guys!
john, what do you mean it may konk out on me? are you referring to the pump or to the motor? i don't really care is the pump konks out on me, but i don't even want to risk losing the motor? can a bad pump hurt the motor?
john, what do you mean it may konk out on me? are you referring to the pump or to the motor? i don't really care is the pump konks out on me, but i don't even want to risk losing the motor? can a bad pump hurt the motor?
Re: bad fuel pump? B1 cam/ hooker header dyno inside... I would say yeah, a bad pump will more than likely do some damage, considering your A/F ratio will more than likely go Good, rich, REAL rich, then no fuel, and motors don't usually run good on air alone! Not being a smart ***, just demonstrating what will more than likely happen.
But, what I actually wanted to know is what heads are you running? Stock, ported? Running an LS6 intake? The reason I ask is because so far you've listed two of the mods I'm planning on doing (B1, Hookers, Ported Heads, Holley intake) and you're making real good power, so I was just curious about what to expect.
Thanks man,
Taco
But, what I actually wanted to know is what heads are you running? Stock, ported? Running an LS6 intake? The reason I ask is because so far you've listed two of the mods I'm planning on doing (B1, Hookers, Ported Heads, Holley intake) and you're making real good power, so I was just curious about what to expect.
Thanks man,
Taco
Re: bad fuel pump? B1 cam/ hooker header dyno inside... Fuel pump might conk out.
My car ran really lean with the bad pump in higher rpms, so I was afraid to get on it.
My car ran really lean with the bad pump in higher rpms, so I was afraid to get on it.
Thread Starter
Joined: Nov 2001
Posts: 1,794
Likes: 1
From: Slate Hill, NY
Re: bad fuel pump? B1 cam/ hooker header dyno inside... taco, i can't believe i forgot to include my sig. all mods are in there. stock heads by the way. let me know if you want more info...
FYI...the tuning made sure that my car won't go real RICH.
thanx!!
FYI...the tuning made sure that my car won't go real RICH.
thanx!!
Trending Topics
Re: bad fuel pump? B1 cam/ hooker header dyno inside... Nice numbers. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" /> <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Re: bad fuel pump? B1 cam/ hooker header dyno inside... You can also get a 255 lph pump direct from Summit Racing. Mine for my '98 T/A was labeled as a BBK for a 5.0 Mustang. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> I used a large screw clamp to hold the 255 pump in place since it won't fit perfectly in the stock pump location. It's much easier to see what I mean once the pump is out of the tank. Just be sure that the float can move freely away from the sock filter before it goes back in the tank. Mine got stuck after we had it all back together, and we had to pull it back out. <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" /> You'll also need a small piece (buy 6" to be safe and then trim as necessary) of fuel injection hose to connect the pump. I used two screw clamps to hold the hose in place, one on each end.
My FP was dropping to 47-48 at WOT prior to the swap. With the 255 lph pump in place, my pressure never dropped below 56 psi at WOT.
My FP was dropping to 47-48 at WOT prior to the swap. With the 255 lph pump in place, my pressure never dropped below 56 psi at WOT.
__________________
Thread Starter
Joined: Nov 2001
Posts: 1,794
Likes: 1
From: Slate Hill, NY
Re: bad fuel pump? B1 cam/ hooker header dyno inside... thanx trevor. what hp level were you at when you had the low fuel pressure? i am going to put a stock pump back in (warranty), but i want to make sure that a new stock pump will be able to handle my power level.
by the way, here are my dyno graphs.
this shows the fuel pressure falling:
http://www.ponycars.net/images/dyno11.jpg
this shows before vs. after LS1edit:
http://www.ponycars.net/images/dyno12.jpg
by the way, here are my dyno graphs.
this shows the fuel pressure falling:
http://www.ponycars.net/images/dyno11.jpg
this shows before vs. after LS1edit:
http://www.ponycars.net/images/dyno12.jpg