I am looking at a 150 shot wet system that hooks up to the fuel rail. My question is will the stock fuel system on my 95 be enough for 150 shot? Thanks.

 

Running a 150hp shot is playing with fire on a stock bottom end car.

It should be ok on a stock engine, fuel wise. Just make sure your fuel pressure cut off sensor with the nitrous kit is working.


The SAFEST bet is to upgrade your fuel pump. Pick up a walbro 255lph pump. It costs about $100 and would take less than an hour to install(don't worry about draining the tank).

Even if you put in the fuel pump you may hurt your pistons on that size shot.

 

The motor isn't stock. I have forged pistons so that shouldn't be an issue. My motor is currently makeing around 400HP. Do you know how much HP the stock pumps can handle?

 

You have your stock pump maxed out. You can buy a walbro 255lph pump (most 255lph aftermarket pumps are made by walbro) and be good to go. All you need to do is open your gas door, remove the bolts you see, and pull the sending unit out. The old pump comes off and new goes on. Check your hose and wiring connections while you are there, but it plugs right in, then put it back together.

As a side note, (and I know you don't have a stock bottom) I've run a 150 shot on my stock bottom end. Only problem is the pcv system can't keep up with the extra blow-by and some oil will spit out the dipstick tube while spraying. I ended up turning my smog pump into a crancase evac pump and tying it into the ehaust. The other valve cover has an open breather. Works like a charm.

 

I'd like to get a better description of this, or maybe some pics. I was under the impression that the plastic fins in the pump couldn't handle the evac temps.

 

Thanks for the side note Dan. I'll keep that in mind. Where would you recomend I get the pump from?

 

Hey guy's! I just got of the phone with a walbro vender. I told them that I needed to support up to 550HP and they told me that the walbro wouldn't do it. They also said something about getting a full 13.5 volts to it to increase it capability. How would I do that?

 

I think this is what you are looking for:

http://www.lingenfelter.com/store/rx-c44-fpwhg-2.html


You're other option is to go with a dual walbro setup. You should be able to use the factory lines with both pumps. The lines will support 700hp, or so I've read. I'm using an extra 6an feed and stock return line and I'm doing just fine.

 

the other way to do it for your application would be to toss a bosch or walbro 255lph HP inline pump on there and run the hot wire kit to it, this allows the stock pump to feed the larger pump fuel at negligible pressures where they flow the most and the larger pump can support well over your 550hp mark with a pusher pump behind it. this is also a fairly easy install and can be used with the fuel pump wire kit and relay supplied by racetronix. you may want to contact Greg Carrol at blower works, he has this system perfected and has tested it to perfection and is a great source of knowledge in the forced induction and nitrous community.

Hope this helps!

Chris

 

Thanks guys for your help!

 

FWIW. I just installed the Racetronix fuel pump & wiring kit. Fuel pump was easy. The wiring kit was easy once I figured out the routing of the wiring. This was one of the few "bolt on" parts I've ever used that didn't need some modification to fit/work.

 

If you don't mine me asking where did you get your pump from and how much was it?

 

Hello Chris, I called blower works today and the more I talked to him the more depressed I got. I didn't get his name but he was telling me to support 550HP I would need to put a walbro in the tank along with the walbro inline and wire kit. He also said that I would need a set of there 40lb injectors. I even mentioned that I just bought a set of 37lb Delfi's but he said that it wouldn't support 550HP. I have some Datalogs that only show just over 60% duty cycle at WOT. I don't think that an extra 150 HP is going to tap them out.
After talking with him I looked this up on there web site. All Carroll C4 kits include a new High Output Walbro GSS-340 in-tank fuel pump that can flow 255 L/Hr @ 43.5 psig. That’s
enough fuel to support over 700 HP @ 60 psig. When required we supply an additional Walbro GSL-392 in-line fuel pump that
mounts behind the license plate that can support 850 HP @ 60 psig !!! Add a voltage booster like the Kenne Bell BAP and these
two pumps in series can support over 1000 HP.
I think this clearly says that the one intank fuel pump will support700HP @ 60psig and I am only at something like 43.5 psi. Im thinking that he might just be trying to sell me parts.

 

well, for starters... 37lb/hr injectors will not support 550hp unless you are jacking your fuel pressure up through the roof, and then that reduces fuel flow capability from the pump. minimum would be 42's or even 50-55lber's. it sounds to me like you should have thought this through before buying other parts like injectors. never fear thats what the for sale forum is for. Greg isn't just trying to sell you parts, he is the kind of guy who knows how to do it correctly and see's half assing something as the WRONG way to do it.. this being said when it comes to fuel systems as I state probably 5 times in this post, it may be the single most important system on a vehicle especially a nitrous car or turbo/blown setup. don't skimp, its that simple.

the stock intank will not be stable above about 425rwhp and is fading at that output. a single intank walbro 255 gss340m on my turbo vette ran out of steam right arounf 500ish rwhp. fuel systems are NOT cheap but a fuel system is the one thing that may keep your motor alive and running well. I ran two of them intank in parallel before switching to the aeromotive A1000 and now I will be adding a second A1000 in parallel. big power takes bif fuel feeding.


If you would like to get a better understanding of fueling requirments, I would try a google search and read a little bit about BSFC (Brake Specific Fuel Consumption) this will help you size your own fuel system and fill your engines needs for now or even down the road (if/when you go bigger) so you aren't buying parts in vain and getting what will handle your power requirements.

hope this helps!

Chris

 

That rating is nominal and assuming your pump gets 13.5V at it's connector on a test bench with little or no restriction.

Factor in voltage loss, line restrictions, heated fuel, a warm pump etc. and you can expect that number to drop considerably. A single in-tank 255LPH pump with upgraded wiring is good for apx. 550RWHP depending on your motor's BSFC and maximum operating fuel pressure. Then you have to have a safety margin of about 20%.

 

[so you aren't buying parts in vain and getting what will handle your power requirements.

hope this helps!

Chris[/QUOTE]

I didn't just buy the 37 pounders on a wim. I bought them because I was running over 80% duty cycle at WOT with the set up I have now. I'm just crying because I need to buy another set. I appreciate you guys steering me in the right direction. Thanks.

 

Chris, What did you have to do to your stock tank to run a a1000 pump? Or aren't you running the stock tank?

 

I sumped my tank to work with the A1000 fuel pump. but I am about to switch and go with a prostreet fuel cell with the foam and the GM sending unit in it, for about 159.00 bucks its hard to go wrong and makes the feed and return much easier to contend with. Just have to figure out what to do with the filler neck when the cell gets here, shouldn't be too tough though. no more then putting a 76mm turbo in the front of the car..lol

CHris

 

Chris, Do you still have your old parallel setup and would you like to get rid of it?