alrighty well this might sound like a dumb question but i dont know of any balt owners that have decided to and a fuel pump....i plan to do this after i get my stage 2 kit on...now is this a dumb idea for the balt or should i go with it because my best friend drives an evo 8 and his car is doing unbelievable on wit the 255 warlboro.....

last and here's the dumb part....some dumb **** not sure wether or not to believe im thinking not tho told me that it wont be the same size for the balt and that the balt wont be able to handle a 255 warlboro....

i think it will....any info or help would be great

ps....cams yes no?

 

fuel pump no.
cams perhaps, can you tune?

 

how strong is the stock fuel pump

 

This is something I've been interested in for a while. Does anyone know the lph of our stockers?

 

ive got a modified walbrough 255 withan msd boostapump on my other cAR. BUT IT NEEDS A bit more fuel than these ones do

 

ive always used walbro 255's in my dsm's. but those cars used a return style fuel system, wheres our cars use a returnless style system, so i dont think it would work.

but has anybody used a kenny bell boost a pump on these cars yet?
Does anybody know what the stock fuel pump flows and where it maxes out?

 

Why to spend money on an upgraded fuel pump if your stock pump isn't maxed out ...

 

The stock fuel pump doesn't provide enough flow and pressure for the higher modified cars. I think the Walboro with a return line and a boost referenced regulator is the solution. We shouldn't need 60# (~660cc) injectors for what little power we are putting down.

 

It's also a matter of the differential pressure that goes through the injectors. For example, if there is 55 PSI in the fuel rail, but there is 20 PSI in your intake manifold (20 PSI boost pressure from a very small supercharger pulley), then the differential pressure through the injectors is only 35 PSI.

 

Exactly. That is why we need a pump that can support the extra pressure to compensate for the added manifold pressure and a boost referenced regulator.

 

<ignorant post> you might want to look into the Solstice GXP fuel delivery system. Since it's direct inject they need high pressure pump. Don't know if it would be usable tho... </ignorant post>

 

most direct injection cars have two pumps.one from the gas tank to the engine bay at a normal pressure point then another one in the engine bay to supply major pressure to the injectors. so its a good chance that nothing would work in our systems

 

thanks...you learn something everyday!

 

someone said something about the bigger fuel pump only on somethin with more mods and i wasnt planning on doing the upgraded fuel pump until the stage 2 kit from new era performance was on including the stage 2 kit 50 shot and tuned/dyno'd... so thats when i was planning on it... is this still a bad idea

 

the gm turbo cars run 2100 lbs of pressure.

i don't see this being a good thing on our cars.

 

If you are only using the 42# injectors you should ok. The 60# injectors are really when the problems seem to set in because of the increased flow they provide.

 

it wouldnt hurt to put it on tho but not really necessary til stage 3 or increased pressure

 

Haha, yeah I don't think that would fare to well. The only cars I know of that use this much pressure are direct injection; diesels run even higher pressure levels.

 

I plan on rasing my compression ratio to 9.5 to 1 and running some meth and 50 pound injectors on a ported and polished blower with the 2.79" pulley. would mine be fine?

 

9.5:1 is stock compression. I haven't heard of anyone using the 50# injectors. I heard there is a vendor selling them, but I have yet to see someone using them so I don't know if they would result in a problem like the 60's do.

In all honesty the 42's should handle it if they had the extra pressure to compensate for the added boost.

 

oh, so then how about 10 to 1? And for the injectors is there a slightly bigger set I could get for my meth setup? I will also be running the GM performance cams, ported and polished blower with the 2.79" pulley.... just double checking thanks for the major help.

 

There are problems with running higher compression with more boost. I wouldn't take the compression any higher than stock unless you get a more efficient form of FI that won't heat the air as much as the Eaton does. I'm not sure what you mean by injectors for the Meth kit. As far as GM cams, they will not run properly on the LSJ and also require you to upgrade the valve springs. Here is a quote directly from Crate Engine Depot.
Comp Cams has some off the shelf cams for the LSJ. You might give them a call or send them an email to see if they will work properly in a stock LSJ. You may also have to upgrade the valve springs depending on how high the lift is on the cams you choose. The stock springs aren't rated for too much more than stock lift.

 

Hey man, thanks a bunch. This has helped me out a ton. I will continue to do more research into this subject and post up what new information I can find. You have been such a great help, thank you.

 

but dont diesels run there cams into the injectors for extra pressure

 

the lsj cams from comp do not work with the stock cam sensor.