Carp
Newbie
- Joined
- Dec 10, 2006
- Messages
- 8
Boondockers turbos use both the stock pump and a secondary MSD fuel pump in series. I have read this isn't a very good way of doing things. Is there a way to use only the MSD fuel pump? How can you use the stock pump as a pickup only, is there a way to gut it so it just pulls through the filter sock? Any ideas? Some stated they just use the MSD pump, which is what I want to do, but don't know what to do for a pickup in the tank.
SPEED
TY 4 Stroke Junkie
Apex Man
Pro
MSD pump
Just make sure you mount the MSD pump low. It must be a gravity feed. I mounted mine up high on top of the steering gate frame and it was bucking and surging big time from fuel starvation. Was told by MSD that it was designed to push not pull. I made my fuel tank plate from 1/4" aluminum and I adapted a Yamaha Rhino tank outlet flange along with a ski-doo screened pickup. You will need a fuel injection filter after the pump. I am mounting my MSD pump inside the left foot well. MSD says to keep the fuel supply hose as low as possible. I will post pictures as I progress if any one is interested in seeing them. When I switched back to the stock pump, from where I had the MSD mounted high, the surging dissapered but I have a lean condition at 10 pounds of boost which to me indicates I need more fuel so back in the MSD pump will go. I would not use the pumps in series as you will still be limited by the stock pump's limited flow rate. Using the MSD in series with the stock in tank pump would only boost the available fuel pressure not the available fuel flow rate.
Just make sure you mount the MSD pump low. It must be a gravity feed. I mounted mine up high on top of the steering gate frame and it was bucking and surging big time from fuel starvation. Was told by MSD that it was designed to push not pull. I made my fuel tank plate from 1/4" aluminum and I adapted a Yamaha Rhino tank outlet flange along with a ski-doo screened pickup. You will need a fuel injection filter after the pump. I am mounting my MSD pump inside the left foot well. MSD says to keep the fuel supply hose as low as possible. I will post pictures as I progress if any one is interested in seeing them. When I switched back to the stock pump, from where I had the MSD mounted high, the surging dissapered but I have a lean condition at 10 pounds of boost which to me indicates I need more fuel so back in the MSD pump will go. I would not use the pumps in series as you will still be limited by the stock pump's limited flow rate. Using the MSD in series with the stock in tank pump would only boost the available fuel pressure not the available fuel flow rate.
rxrider
Jan-Ove Pedersen
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On the MCX turbo kits for RX-1 only run with a external fuelpump placed in front of the battery. It's positioned below the bottom of the tank and is a gravity feed fuel pump. It uses the original fuel picup and the two lines coming from the tank is T-ed together to a 1/2" line going to the pump.
Running the MSD pump as the only pump should work equally well as long as it is kept below bottom of tank to ensure gravity feed at all fuel levels.
Running the MSD pump as the only pump should work equally well as long as it is kept below bottom of tank to ensure gravity feed at all fuel levels.
Need for Speed 2
TY 4 Stroke Junkie
Apex man I disagree with you on the pump set-up. I dont think fuel volume is the problem at highere boost levels but more of a pressure problem or lack of. As the intake pressure rises the need for more fuel pressure also At 1-1 rising rate of the stock pressure reggulator and the fact the stock pump just plain cant handle the pressure requirements as boost climbs. boost pressure up 10lbs so does fuel pressure up 10lbs to offset the intake pressure. Beyond 14 lbs we need a higher rising rate say 2-1 would be better. At 1-1 you still only main tain the same fuel pressure you started with based on the intake pressureforcing fuel back at the injector. Stock pump pressure is in question here at higher levels not volume.
Apex Man
Pro
I respect your comments and I am not offended what so ever. I base my comments by what I read on Dyno Tech where a supercharged Apex with 10 pounds of boost showed it was needing more fuel at high RPM. They monitored fuel pressure and they said that was not a problem. I agree, a rising rate regulator is one way of increasing fuel flow or by the PWM of the injectors via the control modules. As we know the resistance to flow creates pressure and increased pressure across a fixed orifice size also increses fuel flow so they work hand-in-hand. Anyway the MSD supplies enough fuel to satisfy flow requirements. As you know the stock regulator is preset and not to mention that the stock injectors have a maximim operating pressure. I don't disagree with what you said about pressure. This is just my way of solving my problem while still using the stock fuel regulator and not complicating things more than they are already. So in essence, as you said, more pressure creates more flow. We will say available pressure because the stock regulater I believe is preset around 36 PSI.
pelo'n
Newbie
- Joined
- Jan 3, 2008
- Messages
- 8
MSD pump
I was talking with a sled shop here in Colorado and they are removing the MSD from their apex's. At these elevations (10,000 and better) our fuel requirements are much less, so our turbos can utilize just the stock pump up to 15 lbs. After that well you need the fuel boost.
I'll be doing this shortly and I'll fill you in.
I was talking with a sled shop here in Colorado and they are removing the MSD from their apex's. At these elevations (10,000 and better) our fuel requirements are much less, so our turbos can utilize just the stock pump up to 15 lbs. After that well you need the fuel boost.
I'll be doing this shortly and I'll fill you in.
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