Mikkel

Good advice there from a real domestic engineer. Come on own up, that must be what you are right?

pslewis

Those who know, know

pslewis

Does the Impreza use a 'return' system in the fuel line? Or is the pump duty cycle controlled by the ECU? ie. 'returnless'?

I think the the Impreza 'returns' unused fuel to the tank ... but I could be wrong?

fatbeerboy

Hi bit of a newbie here, i've been reading this thread and i'm afraid that i have to slightly agree with mr ps lewis. I havn't owned my scooby for that long, but if you understand turbo'd engines then the same rule applies to all. Basically an "uprated pump" i.e a pump which is capable of flowing more fuel than a standard one, is only needed depending on your level of tune. So (i might be wrong) if you get a standard wrx ppp'd then you will get about a 40hp increase to do this they just change the exhaust, turn the boost up via the ecu and then increase the fuel delivery via the ecu. So the more you increase the boost the more fuel you need, so because on a standard wrx you're only increasing the boost slightly to achieve 240hp - you will not need and uprated pump - HOWEVER, if you were to turn the boost up so that you could acheive over 300hp then at this point it would be my guess that to accompany such a rise in boost then you would need to flow alot more fuel (to avoid leaning out)- so in this circumstance you would probably need an uprated pump, this is probably why prodrive install an uprated pump on ppp'd sti's as they are taking them to over 300hp.

trails

iTrader: (41)

you are correct Pete, there are three feeds from the bulkhead; fuel is delivered via the bottom line through the fuel filter and (in an OE set up), runs through each injector in series (and the FPR), then exits the system via the top bulkhead feed back to the tank. The middle one is the breather for the fuel tank which is connected to the carbon cannister

pslewis

So, I can assume that if fuel is being returned, unused, to the tank, that the standard pump is delivery more than the engine requires?

It's the margin of that 'over-supply' which would dictate whether an uprated pump is needed for a given mod.

My Engineering intuition tells me that uprated pumps are being sold to people who don't need them - and, someone, somewhere, should make people ask the question before parting with their hard-earned cash ............. oh, I am!

340BHP-WRX

iTrader: (6)

I have an 'Engineering' background and can therefore see the need to uprate the pump to a pump which is capable of flowing more fuel per hour IF that amount of fuel is required.

I also understand what pete is saying(don't tell him I said that!)the standard pump can flow enough fuel from what i'm told for around 320bhp-but that would be on it's limit-fit an uprated pump and that limit is then higher and therefore reducing the chance of running lean.

It would be nice to see facts/figures to prove what the standard pump is capable of.

I don't see that money is wasted 'just in-case',if someone says to me that you 'may' require an uprated pump or your engine 'may' go pop then i'd rather spend the £100 or whatever the pump costs than wait for my engine to go pop and realise that I did need one all along

pslewis

Fair, honest post ....

I have here, in my grubby little hands, a Rally Xtra Power Anti-Lean Device - you fit it on the bulkhead by the Turbo, it produces a magnetic field which 'balances' the Turbo Blades so they run true in the bearings. By fitting this you will ensure that your Turbo runs faster, smoother and will make your engine last much longer as it also magnetises the fuel particles to prevent detonation. It comes with a dashboard mounted set of LEDs which will flash randomly to inform you of the fuel particles state of charge.

£199 to you ... and anyone else for that matter! It's better to be safe than sorry!! £19:99 p&p .... it's cheaper than a £2000 rebuild!!!

Designed and Built by one of the worlds leading Engineers...........

Interested??

Alan MaC

Got to be a wind up right, Mr Lewis??

You made the product up, to show how easily people part with their £££, if it sounds good & marketing speel.

The point you made about measuring standard fuel pump flow rate V's Uprated Pump was a good one.

Stil no advice on this yet??

Apart from that, you have hijacked my original thread, please look at the 2 questions I have asked advice on and, help me please.

Thanks.

regards


Alan MaC

340BHP-WRX

iTrader: (6)

You just can't help yourself can you

scoobystiv8

Sorry to burst your bubble but prodrive do supply uprated pumps as part of the ppp on some cars
http://195.212.11.58/IMGGB/WWW/Subaru_Accessories.nsf/NULL/6B0125769554919D80256DDD003AF2C9/$FILE/03MY%20STi%20PPP.pdf
Maybe they are required sometimes?

340BHP-WRX

iTrader: (6)

That's what pslewis is best at-ruining peoples genuine requests for advice and hijacking their posts !

Alan MaC

Your spot on.

Mikkel

Yes agreed and apologies for fueling his patter... he's just so arrogant and smug you can't help but get drawn in.

haroldhettaturbo

iTrader: (2)

If you say his post is fair and honest. why post all that **** below it.

Perhaps it proves your wrong.

Typical answer from you ps lewis, soon as you get proved you are wrong you start posting even more b0ll0x than normal.

340BHP-WRX

iTrader: (6)

He IS the worst thing about scoobynet-it was nice while he was banned. He should be banned permanently for ruining peoples genuine questions for help/advice.

pslewis

I was never ACTUALLY banned you numptie .... can't you get ANYTHING correct

I take it you don't want to buy my Super-Duper Device then? It may save your Engine - better to be safe than sorry!?

I have decided to run a Special Offer on it - £220 Including P&P ..... interested now?

J_sca001

You are a f00ker Pete!!

Joke and apart, no pisstake intended but what year and model scooby do you drive??

340BHP-WRX

iTrader: (6)

I am obviously nowhere near as intelligent as you am I

Alan MaC

My original post for genuine help & advice on uprated FP'S still remains a mystery to me.

Any one help?

I am looking to get over 300 BHP and just want to make sure, I get everything prepapared before hand and, is there anything I have missed before hopefully, the final remap?

Advice from GENUINE ENTHUSIASTS please.

Regards.


Alan MaC

J_sca001

Hi Alan,

i can only give you my experience of Scooby's.
I owned a 94 WRX full decat and induction kit.
The engine blew. I was told the fuel leaned out and melted a piston, (Who Knows?)

I the bought a 2001 import bugeye STI and done the same again. Again it melted a piston.(Yes i know, what a dick!! )

I had the car repaired and took it to Powerstation, (Very well known and respected company who know a huge amount about Subaru's)

I took it to Richard (Powerstation) to have a re-map, (Ecutek).

I watched him monitoring the detonation and he stopped the mapping within 10 minutes and told me it was detonating badly.

He measured the fuel pressure and it was fine, however, the fuel flow was not enough to push the required 300 plus BHP.

They are not cheap but i was there and paid £125 for a Walbra 255 and £25.00 to have it fitted, (Have to say they did do a deal for me though )

The cars final output was 332 BHP.

It's all about peace of mind,you have to trust someone. I have to be honest and say i sold the car a few months later but had so much more confidence in it after the map.

You can pick-up a genuine Walbra 255 delivered for £75.00 from Ebay and they are easy to fit, but if your not up to it any garage shouldn't take any longer than 30 mins labour to fit.

And as a few others have said, Risking a wasted £100 ish saves paying around £2500 for a total rebuild!!

No doubt others will disagree, but thats my experience.

superstar1

This thread is class, never laughed so much in a long time. Dont no much about fuel pumps, Just drive a Scooby, but keep this one going lads and when you've exhausted this topic start on the dump valves, gold alloys, turbo timers and knock links-can't wait

Alan MaC

Nice one J sca 001,

II've been to Powerstation also, Rich is top man.

If he is saying Walbro, then that's good enough for me.

Thank you for that constructive, real life bit of advice.
Regards.

Alan MaC

pslewis

Well, my REAL LIFE experience is this .....

Don't pi55 about with the car with Induction Kits and Re-Maps and De-cats - or, the car WILL bite you back!!

Subaru build it to last, their designers have spent years in Design Reviews and Modellled everthing on the very latest CAD Machines, they have Rapid Prototyped parts and they have tested to destruction many items. They have looked at the Oils available and run engines with different types for millions of miles, they have designed and selected components to last if used withing spec.

Then along comes a muppet and changes it ... then is shocked and disappointed when the thing says, "ENOUGH NUMPTIE" and goes BANG

Enthusiasts, my 4rse, genuine Subaru Enthusiasts cherish their cars and keep them within the specifications which Subaru recommend ..... they do not create abortions!

By this simple measure, it would seem that I am the True Enthusiast .... could the others please sign up to www.Chavvie.Cars.com

MaDaSS

LOL, but you know, its very true!

340BHP-WRX

iTrader: (6)

Think what you want

Personally I think YOU are the REAL muppet !

pslewis

You can have your opinion - but, it cannot be in dispute that I am the Genuine Real Life Subaru Enthisiast here about

You seem to be creating an abortion out of a perfectly good car .... isn't that right?

340BHP-WRX

iTrader: (6)

Why am I 'Creating an abortion out of a perfectly good car' ?

Trout

iTrader: (1)

Your engineering intuition might be telling you something - however your engineering expertise is clearly lacking.

Even in a return based system with a regulator there may be plenty of fuel being returned but if the pump ain't up to it then there will be a pressure drop across the fuel line. Given the injector duty cycle is based on the correct pressure then less fuel is injected than required, or the IDC needs to be remapped.

This will happen if the car is modified for higher power. If your concern is your hatred of modified cars then please stick to that rather than pretending you actually know anything about car engineering.

pslewis

Oh, Sorry, I didn't realise that yours remained standard?

No, I was talking about those who fooook about with them ....... Tee Hee!!