R33 Fueling/knock Issues

[Checkbuzz]

I understand what your saying but my tuner didn't install anything on the car...

He did ask about the pump and how it was wired up and clearly the engine wasn't leaning out on the dyno or during road tests.

There also appears to be plenty of high HP cars out there running OK on Walbro's... weren't you running a Walbro with a GT3037?

Just saying... it ain't a perfect world mate

Back on topic; do you have any experience with or opinions about the DW301?

I still don't understand why you'd tune a car right on the edge of the fuel pumps capacity.

Anyone in the industry knows the walboro is shit beyond 60psi, or much beyond stock power.

It's basic maths.

[The Mafia]

weren't you running a Walbro with a GT3037?

ummm and didn't I say that it ran out of flow, at about 280rwkw?

So completely maxed at 280rwkw means the pump is only good for about 250rwkw...

I hear all about these "High horsepower cars" running walboros, but I don't see any models or horsepower figures being mentioned............

[Dose Pipe Sutututu]

I know I don't need a surge tank for the amount of power I'm running - it's the track work that is the concern with surge

a fuel pump sits right at the bottom of the tank, provided there's a decent amount of fuel covering the entire fuel pump at all times, track or stationary there won't not be a difference.

[SargeRX8]

The 040 seems really good in my car. My AFR's stick to what they should and I run close to 20psi high boost. With my Nismo 740cc injectors, I hit about 55% injector duty cycle. I don't even have the 14v direct feed mod or the ground mod. I dropped it in and I run it.

[Checkbuzz]

Your missing my point which was; like me and my tuner (who you were having a go at) you still tried and you were shooting for 280rwkw+ whereas I was only shooting for 250rwkw

How many "high horse power" cars running Walbros do you want? http://www.skylinesaustralia.com/forums/index.php?app=core&module=search&do=search&fromMainBar=1

I'm not going to argue the point with you because I agree the Walbro is not up to the task...

However you're saying that it's common knowledge and that my tuner f^cked up and I'm saying that it isn't and he didn't.

Let's move on!

ummm and didn't I say that it ran out of flow, at about 280rwkw?

So completely maxed at 280rwkw means the pump is only good for about 250rwkw...

I hear all about these "High horsepower cars" running walboros, but I don't see any models or horsepower figures being mentioned............

[Checkbuzz]

Yes I've decided not to go down the surge tank path... but will be keeping my tank topped up all day at the track

a fuel pump sits right at the bottom of the tank, provided there's a decent amount of fuel covering the entire fuel pump at all times, track or stationary there won't not be a difference.

[Checkbuzz]

I can't argue with that mate... It just that it is very difficult to any find flow charts for the 040 and the info from Bosch is not inspiring.

After this experience I just don't want to take any chances

The 040 seems really good in my car. My AFR's stick to what they should and I run close to 20psi high boost. With my Nismo 740cc injectors, I hit about 55% injector duty cycle. I don't even have the 14v direct feed mod or the ground mod. I dropped it in and I run it.

[zebra]

ummm and didn't I say that it ran out of flow, at about 280rwkw?

So completely maxed at 280rwkw means the pump is only good for about 250rwkw...

I hear all about these "High horsepower cars" running walboros, but I don't see any models or horsepower figures being mentioned............

I pulled the return line off a mates car at 260rwkws with a walbro, not even a whiff of fuel was going back to the tank.

But I also know of a few cars with 300+ running them ok, one is even at 290 on E85.

Seems like most things that are made in the US only 1 in 3 works as it should.

[SimonR32]

Attached is a picture of the Walboro dying in the ass.

I'm sorry what are you looking at? The blue line? Which is the pump that is designed for N/A motors? If you have a GS340/341/342 (which unless you are retarded you would have purchased) then look at the pink line...

Also why are you posting a 12V graph?

Here you go, a 13.5V test (which is a tad under the voltage a Skyline pump should be running)

70psi on a GS341 = 210L/hr which on the graph clearly shows you can outflow the 550cc injectors he is running.

They are not bad pumps, they are actually very good.

Edited December 15, 2011 by SimonR32

[The Mafia]

actually, besides actually SEEING with my own eyes how shit the flow of the walboro pumps are, I've done about 3 other cars that have had the exact same issue.

I didn't tune around it, I told them to get a new fuel pump.

But hey, I'm talking shit....

[SimonR32]

http://forums.evolutionm.net/automotosports-illinois/566110-bosch-044-aeromotive-stealth-340-deatschwerks-dw300-walbro-255lph-fuel-pump-test.html

[gotRICE?]

I use one of those walbro pumps in my R33. Stock wiring. GT30 running 17psi making 300rwkw and track the car regularly.

No issues whatsoever. Have maxxed out 555cc Nismo injectors without a problem when the wideband on the dyno shit itself.

[scotty nm35]

We all know the Walbro's drop off up high in the pressure charts so they would work fine on NA cars and low pressure turbos. Thats the reason I lowered the base pressure to 35psi on my setup, that way they are only hitting 70psi max. Much over that pressure (around 80psi+) they will stop flowing, make some awful noises and lean out your engine.

[Checkbuzz]

Thanks for the input guys... as always much appreciated

There are enough negative comments and experiences here combined with the symptoms my car is experiencing to make me very suspicious about the Walbro.

I am ordering a Deatschwerks DW301which flows about the same as a 044 at 65psi (see link above) and is a drop in replacement.

$200 is cheap insurance in my books after the funds that my Skyline has sucked up so far...

I also have a wide band coming for Xmas (PLX DM6+Wideband) so i can keep a closer eye on AFRs

Hopefully the fix is that simple

I will update this thread with my findings and results on the fix and the DW301

[NoFigJamHere]

I'd be looking at air intake temperature myself.... The thing i will say regarding your "tuner" is he is obviously new to the tuning world, how on earth can you diagnose/advise/tune without reading lambda?

[Checkbuzz]

I'd say don't comment on things that you clearly know nothing about.

My tuner is one of the most experienced in the biz (Robert @ Sabbadin) and I am very happy with his work.

He came down to Sandown at short notice and spent an hour helping me out at no charge!

That kind of customer service is farking hard to come by these days!

Most tuners don't even answer the phone/email/sms and are proper a-holes to deal with.

This is the second time that he has looked at this issue free of charge for me assuming it was his tune that was the problem.

We both assumed the problem was too much timing in a couple of cells but that was not the answer.

There were no problems with the pump during the original tune or second check-up where of course he used a wide band.

The issue was almost impossible to recreate until the track day where it just got worse as the day went on

P.S if you read through the symptoms it doesn't make any sense that it would intake temperature related

I'd be looking at air intake temperature myself.... The thing i will say regarding your "tuner" is he is obviously new to the tuning world, how on earth can you diagnose/advise/tune without reading lambda?

[SimonR32]

My tuner is one of the most experienced in the biz (Robert @ Sabbadin)

assuming it was his tune that was the problem.

Lolwut

[Checkbuzz]

Bell end

I didn't think school holidays started until next week?

Lolwut