420bhp. We knew it was going to be closed to maxed out I wasn't expecting it to fail in that way! Glad it did and not later down the line when I wouldn't have noticed until it was too late

 

The big sytec Stu? My new pump is a hell of a lot bigger than the walbro. If so you got a blinding deal there!

 

Thanks Jura.

 

For Bosch 044 i would contact Mark@Lateral performance or Alyn@AS Performance,these two will sort you out without the doubts.


Jura

 

This post has helped loads cheers folks

 

The existing fuel pump cradle will need modifying to fit a Bosch 044 in the tank and also will need the wiring upgraded.

 

Walbro should be fine, think bosch is a bit overkill for what you are wanting to be honest

 

Ya think daz??

 

I am thinking about getting a Fuel Pressure Gauge with a bleep. Anybody got one on there car?

 

Q: How does the flow of a Bosch 044 fuel pump compare to a Walbro 255HP?

A: Independent test results show the where the popular Walbro 255HP fuel pump flows 256 LPH at 30 psig fuel pressure, then Bosch 044 flows 290 LPH. This isn't really important though because most cars only see this pressure at idle. Now assume a vehicle running 30psi boost on 45 psi base fuel pressure (75 psi net fuel pressure). At this pressure the Walbro 255HP is flowing 208 LPH and the Bosch 044 is flowing 267 LPH (28% more capacity). Finally, at the top end of the chart (90 psi fuel pressure) the Walbro 255HP flows 156 psi and the Bosch 044 flows 253 LPH, which is 62% more!

This graph illustrates how the Walbo 255HP fuel pump has an exponential decline in flow at higher pressures, where as the Bosch 044 is linear. An interesting fact is that the Bosch 044 at 90 psi is flowing about as much the Walbro 255HP at 30 psi.
http://www.jayracing.com/images/Bosc...lbro_255HP.JPG

 

Bosch will flow more than the walbro, no question!!! Just seems overkill on a standard engined sti even running an md321t? What sort of boost will the car be running?

 

Don't know mate? What ever a standard ecu with large maf can take I suppose

 

Still think you will be OK with HRC 340lph,i'll be running this at 500bhp and if you compare just weight of Walbro 255lph against 340lph is there difference,from reports on other sites,people are happy with these pumps...


About the larger MAF,you mean Larger MAF housing not MAF,if is this i would have look at KSTech or Perrin.But if you are running FMIC solution is too Blown through MAF

Jura

 

I would go with the RCM one in your situation. Walbro will be right at its limit, the other options are not made by THE best Subaru tuning company in the world and are not far off the price. The RCM one is basically designed for your specific application
As mentioned the Bosch would do the job and then some but would need wiring upgrades.

I am also going MD321T on a newage and went for a Walbro + Swirl Pot + Bosch 044 + Billet fuel filter + wiring upgrade for the protection from fuel surge when on track.

As always, speak to your mapper, I went for an Apexi AVCR to control the boost

 

About the larger MAF,you mean Larger MAF housing not MAF,if is this i would have look at KSTech or Perrin.But if you are running FMIC solution is too Blown through MAF

What's this then????

 

im sure a blow through MAF is just relocating it to the pressurised side of the turbo, ie, between the turbo outlet and i/c or between ic outlet and throttle body.

i cant remeber details, but im sure it improves something lol - great details there

 

Blow Through MAF is relocating your MAF to FMIC pipework

Something like this






Jura

 

Its not the maf or ecu im on about its the map sensor im thinking, there was a discussion about it on 22b.com one is supposed to only be able to read upto around 1.55bar, not sure which one your car has. I ran just a walbro for a year and a half at 450bhp and 500lbft with no problems what so all, have gone to an aeromotive stealth now but also need a swirl pot and external pump too. Bosch will be fine for you though and much better than the walbro

 

Well now I'm confused!!!
I've just bought japspeed fmic will ghat have the relocating maf hole on it??? As im getting the Perrin induction kit that has the big maf hole on it!!! Will I have to cap one off???
Thanks for advice guys

 

Hi there

Usually people do own Blow Through MAF,its cheaper than buying complete kits.

Perrin selling Big MAF housing,but not sure if selling Big Maf including induction kit.

Jura

 

It's a Perrin short ram induction with large maf hole mate

 

it would be a big help if one or two of the well known mappers would give some input on this walbro "problem". No doubt quite a few have read the thread.so stop sitting on the fence and give us your views or advice on which pump works best when you are mapping.

 

Would be nice if they did mate

 

If is this case,you should be OK with this kit

You mean this




Jura

 

That's it Jura

 

Systec are Walbro. When we first started selling Walbros many years ago we had a number of failures. Not as many failures as we were seeing with Bosch pumps mind. However the failures were short lived and I now can't remember the last time we had a Walbro failure. We buy 50 pumps at a time and have sold thousands over the years.

Talking of 044s, the one in my V8 S14 has just given up. I'm not a fan of Bosch pumps, they don't seen to be very durable in my limited experience of them.

I'm not saying buy Walbro over RCM, no doubt the RCM unit is superb, I'm just pointing out that in my experience the Walbros are extremely reliable.

 

I agree with Bren Walbro pumps are fine loads of folk run them.

I use a HRC pump but the only reason I went for them as they have a 2 year warranty compared to Walbros 1 year, and I got a good deal from http://www.scoobyworx.com/fuel-pumps-38-c.asp and you get a forum discount for here and scottish scoobies.

 

hello any mappers out there?Dont sit on the fence.

 

Never heard of hrc pumps

 

Oh and whilst I'm asking questions!!!!
What the f**k is a swirl pot????