Twin Bosch or Walbro In tank?
#1
Rotary Enthusiast
Thread Starter
Twin Bosch or Walbro In tank?
I am looking to run a twin in tank setup on my FD3 debating between a bosch 044 but a (310lhp version) and the walbro 440lph ones. I read somewhere that twin bosch is a complete pain to fit? Is this true? I will have much more fuel than I need either way. Cost wise bosch might be a touch cheaper.. but with the extra fitting needed for it maybe not much in it?
I will probably make up my own mount using the standard cover and bits.
next question is best way to plumb it but I will see what comes back from this.
Any advice please chaps?
Cheers
Lee
I will probably make up my own mount using the standard cover and bits.
next question is best way to plumb it but I will see what comes back from this.
Any advice please chaps?
Cheers
Lee
#5
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I also say a single Walbro 450. I've moved away from dual pumps because it is just another failure point. If one pump dies, you will lean out and the motor can blow. If a single pump setup dies, the car will likely just shut off.
Upgrading your fuel pump wiring is essential with any aftermarket pump. The stock wiring is way undersized. Its approximately 10 gauge at the connector, then the Mazda geniuses decided to drop down to something like 14 or 16 gauge in the tank. The wiring overheats and melts the connector. I put a jumper in the fuel pump speed relay up front to bypass the fuel pump resistor. Then I depin the stock connector and insert larger pins with 10 gauge wiring. Each car is different and if I still see voltage drop at the pump, I wire in a relay.
Upgrading your fuel pump wiring is essential with any aftermarket pump. The stock wiring is way undersized. Its approximately 10 gauge at the connector, then the Mazda geniuses decided to drop down to something like 14 or 16 gauge in the tank. The wiring overheats and melts the connector. I put a jumper in the fuel pump speed relay up front to bypass the fuel pump resistor. Then I depin the stock connector and insert larger pins with 10 gauge wiring. Each car is different and if I still see voltage drop at the pump, I wire in a relay.
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#9
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Thread Starter
Just to give a bit more reasoning behind my twin pump. I am running a 20b conversion. Power goal will be around 600bhp at the wheels. Nothing crazy. But good to have scope for a little more. 650max. I think that is a bit marginal on the single Walbro 440? That would be my preferred option if it could work. I also hear the point about failures of one pump causing leaning out which does concern me and is something I have been pondering. Just not sure if I have a single pump option?
Cheers
Lee
Cheers
Lee
#13
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Thread Starter
Reading around some more there is a E85 version of the Walbro I was looking at called the GST450K. this is rated at 455lph and supposed to be good to over 700bhp. up to around 800bhp apparently.
Sounds like it could be the ticket on it's own which would make life easier!? And possibly consider running a large fuel line form the tank to the engine bay to help a bit more? Not sure what kind of a mission that is?!
Any thoughts or any other options?
Cheers
Lee
Sounds like it could be the ticket on it's own which would make life easier!? And possibly consider running a large fuel line form the tank to the engine bay to help a bit more? Not sure what kind of a mission that is?!
Any thoughts or any other options?
Cheers
Lee
#15
Rotary Enthusiast
the pins on the wiring pig tale that come with the walbro fit into the stock connector (but the "key" on the walbro connector is the wrong way around so does not plug into the stock connector)
So I removed the pins / wires from the connector that came with the walbro, and they clip straight into the stock connector plug. Pins are the same.
if that's what your asking?
So I removed the pins / wires from the connector that came with the walbro, and they clip straight into the stock connector plug. Pins are the same.
if that's what your asking?
#17
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iTrader: (41)
Reading around some more there is a E85 version of the Walbro I was looking at called the GST450K. this is rated at 455lph and supposed to be good to over 700bhp. up to around 800bhp apparently.
Sounds like it could be the ticket on it's own which would make life easier!? And possibly consider running a large fuel line form the tank to the engine bay to help a bit more? Not sure what kind of a mission that is?!
Any thoughts or any other options?
Cheers
Lee
Sounds like it could be the ticket on it's own which would make life easier!? And possibly consider running a large fuel line form the tank to the engine bay to help a bit more? Not sure what kind of a mission that is?!
Any thoughts or any other options?
Cheers
Lee
http://walbrofuelpumps.com/walbro-f9...-fuel-pump-e85 the stock hard lines under the car don't start to become a restriction until after 500 whp. After that you want to run at least a -8 feed.
#18
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Thread Starter
Cheers guys.. Yeah that is the pump I am talking about! Cool. I will go with that.
So I might want to consider a new line as well then as I hope to be around that figure. Would you retain the factory outlet on the oem tank cover or replace that with a fitting too? As I recall the pump outlet is the same size as the oem piping anyway?
Thanks for all the replies guys.
Lee
So I might want to consider a new line as well then as I hope to be around that figure. Would you retain the factory outlet on the oem tank cover or replace that with a fitting too? As I recall the pump outlet is the same size as the oem piping anyway?
Thanks for all the replies guys.
Lee
#20
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Thread Starter
Hopefully just over 600bhp flywheel.. Not going to wild for a 20b! But would like some safety margin. Order the F90000267 pump and fitting kit now! Just debating on running a bigger line or not. Sounds like I should be okay on the stock hardline? Might stick with that for now and if I run in to trouble put a separate line in? Hhmm is the dash 8 a straight fit into the stock hardline OD? Not sure on my bore size for an fittings. If so maybe I should just get a line a do it now. Is it essential to run a larger line back as well? Under WOT surely less fuel is going back to the tank anyway?
#24
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Thread Starter
Cheers good to know. My new Walbro arrived the other day. Just in time for Christmas! Hoping I can find time to fit it up in the next couple of weeks!