++++Not to Hijack the Thread+++++

I have a set of 42lbs if one of you need them.

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60lbs are that you want. You have to do some splicing to get them on there buy they will work fine.

 

damn! tell us more

 

Oh, don't worry, I plan on sharing my build with you guys. It's my dads truck, but I'm building it for him. The motor and trans out of an 04 are supposed to be hear tomorrow and will start the build shortly.

The truck is a '72 Chevy 3/4 ton longbed 4x4 my dad bought new in 72 . The motor will stay mostly stock, with a Master Power T-70 front mount intercooled turbo. Should be fun! Its also going to be getting 4 links and air bags front and rear. keeping the stock ride height, but getting rid of the tank like ride

Sorry for the Highjack

 

NO! Nothing like that, It drives great. When we had the truck on the dyno we where monitoring the o2's and as soon as we hit 4500rpm (wot) it started to get extremely lean. Not just a little but like if you where to draw a vertical line, thats how it looked From 10.9 to 12.0 in less than a second. I don't know for shure but it seamed like fuel preasure drop. I want to just be able to finish the run and see when the torque and hp start to fall with that intake, It looks like it was still climbing but we had to take our foot out at 4700rpm. I think I am going to do it in stages and see if I can get away without changing the the injectors and tune. I know I am being hard headed. I did talk to julio at alkycontrol and he said to add the 255 intank and the 3 bar for the meth and an extra nosel. What fuel system is parish running? I think I read that he is useing a two 255's intake, one on a presure switch. Thanks for the input, I need lots... I don't mind lossing the motor if it just can't take anymore but I would be mad at my self if I let it go lean and I blow it up. If this does not work the next step will be the 60's. Thanks again.

 

TURBO8,

I believe Parish is running 2 in-tank 255 like you said, but he is also running 96lbs injectors I believe or something like that. In my opinion, a stock fuel pump with a 255 in-line will flow more fuel that a single in-tank 255 (which is what I have now, but would do if dirently if i had to do it again) The reason being it that fuel pumps are flow rated at their operating pressure. So when you have 2 pumps in series like that, they are spliting the pressure duty between them and they will flow MORE then there rated flow at LOWER pressure. So if your stocker can't maintain the flow at 58 psi, then the in-line will pickup the slack for the pressure allowing the stocker to flow the required volume with the in-line maintaining the pressure.

The reason you have been able to get as far as you have with the 43 lbs injectors is because you have a vac refinances fuel pressure reg. As you boost increases, your fuel pressure is also being increases and is squirting more fuel with the same open time. I'm sure if you had a scanner on it when you were on the dyno, it would show your injector where MAX out at over 100% DC. Hell my 43 pounders are at 80% at 7-8lbs of boost on a 4.8. You need bigger injectors to be safe. More meth would only really be a bandaid.

 

That makes sense to me, I never thought of it that way. How close to the engine are you guys mounting the inline pump?

 

This is what it looks like when you have too small injector and to much boost. This is with stock injectors on a 4.8(not mine) and 10 lbs of boost. Anything over 100% DC its not flowing any more fuel. Note the commanded A/F and the actual.

 

Good piont, Thanks man. I'm looking for some 60's! Any idea how much fuel my two pumps are flowing? and how much is needed for forced induction in the 700hp range? (the motor must be seeing 700+)

 

I think a stock intake pump is rated some where around 160lph, and I think you would lose a little off the max flow of the 2. I would conservatory put this type of setup at around 350lph. That should support a 700 hp setup. These number are off the top of my head, would really need to do some more research to get a more exact figure.

 

^^^^^^^hey KBracing what would you do in my situation. im running svo30s which they say are about 36# injectors on a LS1 psi but i run a stock pump. would it be better to upgrade to a 255intank or get an inline pump but if i get inline which should i get?

sorry ot hijack