Dyno Reads Dangerously Lean

[SKYRYAN]

Hey guys I got a dyno run on saturday and my AFR is dangerously lean.. I'll try scan the graph and post it up.

But to fix this I will need a new fuel pump correct? I was recommended the the bosch 044 by Hyperdrive but then I've had someone tell me that its the wrong one for the R33 and I need the 040? I'm sure Hyperdrive know what they're talkin about though..

So any advice would be sweet as!

[N I B]

Sard ETC is better as they fit back ok,044 and 040 is a lot thicker pump and tends to sit a bit higher.

[WhiteHot_R33]

Hey man, I was in this position about a year ago, pretty stock R33, Leaning out. . .

Ended up getting an 044 through HyperdriveMS. . . They fit with a bit of modding and will pump right down to the bottom of the tank no probs. . . Just sounds like your boot is full of bees.

Be sure to check your AFM is not dirty, especially if you run an oiled pod. as this will stop the AFM from reading all the airflow and the ECU will be leaning out.

if you get one through the traders on here they are pretty cheap now i think!

good luck

[Kaido_RR]

buy a nismo or tomie pump direct bolt in

[Hotrod]

Hey guys I got a dyno run on saturday and my AFR is dangerously lean.. I'll try scan the graph and post it up.

But to fix this I will need a new fuel pump correct? I was recommended the the bosch 044 by Hyperdrive but then I've had someone tell me that its the wrong one for the R33 and I need the 040? I'm sure Hyperdrive know what they're talkin about though..

So any advice would be sweet as!

I had the same as you when I had my 100K service done and was told that I needed a new fuel pump. I got a quote of about $1000 for a stock and $1200 for a NISMO version.

If you don't mind getting it online you can go to Greenline http://www.greenline.jp/ and get a NISMO from Japan.

Cost me $430 delivered to my door ex Japan and took less than a week to get here.

Edited July 9, 2007 by Hotrod

[TurboX]

The Bosch 040 is an intank (044 External) and I fitted one in my GTS4 because of similar problem but turned out to be the std small Fuel Filter was clogged so bad I could not even blow thru it when taken out.

Replaced it with a much larger and highflow unit from a volvo truck or something.. it was much better just harder to mount but used a 3' clamp around it and bolted to std location OK.

[teejay]

1200 bucks for a pump!!!

Haha what the!!

Go the bosch, used them with great success, as have many others

[bubba]

I got an 044 for $214.50 delivered off ebay, pretty sure there is a trader on here that does them for about the same price. Was going to just install the 044 for peace of mind but am holding off till I get a surge tank and a Bosch 910 (910 to draw through the intank pump and feed the surge tank then the 044 to the engine).

[ix9]

Bosch here too - 040, less than 200bux, oh and DIY install. You'll just need a few hose clams and pliers

You can make a day of it, getting high in your boot with the fumes. I recommend it to anyone.

Oh, and run down the fuel till the light comes on before you start fishing around in there - soaking your arm in petrol will guarantee to cause "interesting dreams" when you fall asleep next to it.

[SKYRYAN]

Ok well I'm certainly not spending a grand on a fuel pump... should have checked the AFM and stuff when I was at Hyperdrive

Well I'll book it in for an 040 or something and while that's taken out we'll check the 'fuel filter' and see if it's not clogged up or something. Is there anything else that might cause the problem?

And will the car be running rich after a bigger fuel pump is installed?

[teejay]

get it changed anyhow - its 10 plus years old and your pushing the car harder then stock.

[ashleyr33]

I'd recomend a NISMO pump, fits perfectly, comes with new o rings etc (genuine) and matches the loom, no stuffing around with wiring etc.

Ash.

[Pal]

what power did you make on your dyno run Ryan

[sam5709]

i agree with going for the nismo pump, includes everything for a direct swap, not just that pump that needs moding like bosch pumps,

autoworx do them for $450 less 5% for members and they dont sound as noisy as the bosch pumps

but that just my opinion

sam

[SKYRYAN]

241rwhp but only went up to about 5800rpm

[dodgsun]

?? i got my RB20det done at hyper on sat too with the same probs!!! wtf?? but they said the 040 would suit me!? well at least i now know what to look for!

was also told (by others) the Walbro is just as good as the bosch but not as noisy or costly....... ta guys!

(what time were you there??)

Edited July 9, 2007 by dodgsun

[SKYRYAN]

?? i got my RB20det done at hyper on sat too with the same probs!!! wtf?? but they said the 040 would suit me!? well at least i now know what to look for!

was also told (by others) the Walbro is just as good as the bosch but not as noisy or costly....... ta guys!

(what time were you there??)

Lol true... I'm going to just take it easy and stay off the boost untill I can get a 2nd dyno somewhere else to compare.

I was there around 11am btw.

[ahh 33 s2]

i got a walbro done was cheaper smaller and less noisy, and pumped just as much as the 044 i think or 040, one or the other

[dodgsun]

..and where did you get it!?????

[WhiteHot_R33]

Hey guys Im certainly no expert on this stuff but just to add a bit more:

dodgsun - The reason they said 040 suits you is the style of inlets on the pumps, r32s have a conventional flat bottom fuel tank and have no worries with the mesh bottom on the 040, whereas the R33 tank bottom is not flat and they need a threaded bottom to accept the standard pickup tube and filter sock. Hence 044. . .

The Walbro pumps have been tested and shown to be no good at higher power because they lack the flow at high pressure needed for rising rate regulators and high boost.

Bosch are noisy but you can only hear it at idle with the stereo off or outside the car, no big deal IMHO. If you rubber mounted it it would be quiter Im sure.

SKY RYAN - changing pumps will not effect the mixture because the FPR sets the pressure not the pump, so it will keep the same pressure with more flow available. . .

Why don't you change your fuel filter as well anyways just to eliminate the possiblilty?

What a novel!!

Later