Fuel Regulators?

[Anquetil]

Hi,

I'm wondering should I be looking for any particular model of fuel regulator, are there different specifications/sizes?

Intended modifcations: HKS 2530/2535 on 25DET, Bosch 910, PowerFC, Z32...

When browsing on the net for regulators, there doesnt seem to be any specs or recommended applications?

How much should I pay? They are around $250-400 on the net.

[franks]

you want the smaller sard fuel regulator with an 8mm nipple. that'd be fine for your application. sard have a larger regulator, but not needed for your level of mods.

no model number sorry, can't read katakana or kanji, but my hyperrev says 14000yen. i bought mine whilst in japan for 9100yen and i believe greenline can supply for about 13000yen.

[Mr GTS4]

i got a malpassi one for $170 + postage if you want it? brand new never used

[Anquetil]

Thanks franks!

Mr GTS4, whats the size/specs on yours, what mods where you intending to use it with?

[Busky2k]

Just wondering, but why do you want a regulator? The stock one would defintely be up to the job.

[Anquetil]

Just wondering, but why do you want a regulator? The stock one would defintely be up to the job.

I'm looking to go as far as I can without getting new injectors.

From what I've read, 190-220?rwkw is about the limit of the stock 33 injectors, however with a rising rate fuel reg I'm hoping to get 220-240rwkw which is my power goal.

Whether or not I'll get there is debatable, but if I can milk that extra bit out of the injectors with a reg then I'll try.

[T0nyGTSt]

I'm looking to go as far as I can without getting new injectors.

From what I've read, 190-220?rwkw is about the limit of the stock 33 injectors, however with a rising rate fuel reg I'm hoping to get 220-240rwkw which is my power goal.

Current 'wisdom' (if you call it that) says that 240/250 on 370cc injectors is ok.

I personally have never seen it and I'm a bit dubious about it but it seems that low 200kW range motors should be ok with a big pump + reg.

T.

[markr34gtr]

nismo do an adjustable reg that fits where your old reg goes and is about 200 to 250bucks...no mods needed..

cheers..

[Busky2k]

I believe you should be able to get away with the stock injectors unless your trying to milk your engine for what its worth.

Maybe try the Malpassi, set the base pressure a bit higher to say, 50psi. Altho I cant confirm it, also its rising rate ratio is 1.7:1, so for every pound of boost, it raises the fuel pressure by 1.7psi. You just gotta make sure you get the PFC retuned, and all should be good!

[yogi000]

I got a question along the same lines and didnt wanna start a new thread.

Basically, i got a r32 with stock pump about to die, so bought a gtr pump, do i now need to change the regulator? I was under the impression that i needed to, but others are tellin me its not needed.

Would like to know what all you guys think???

Cheers!!

[T0nyGTSt]

Basically, i got a r32 with stock pump about to die, so bought a gtr pump, do i now need to change the regulator? I was under the impression that i needed to, but others are tellin me its not needed.

Would like to know what all you guys think???

This should be in a FAQ.

Big pump for stock injectors and stock ecu does not need a regulator.

Except if you want to wind up an adjustable regulator for a bit more flow.

Big pump for 550cc+ injectors and programmable ecu does not need a regulator as you should have enough flow already.

T.

[yogi000]

thanks for the info tony

Cheers

[JimX]

My experience is similar to what Tony has been saying (in fact he may be talking about me in his post )

I put a Bosch 044 pump into my R33 and re-tuned the S-AFC. But before I did (there was a gap of a few weeks) I didn't really notice it running any richer. It probably did run a bit richer, but I didn't seem to lose power or economy.

I was hoping to break 200rwkw with the tune because of the bigger pump, which I did (215), but it still started to run out of fuel at redline. Thus I had reached the maximum flow of the injectors. The options from there are to replace the regulator or the injectors. I went with the latter option, but I've still yet to put them in the car. Because I am now also maxing out the AFM, so I am saving up to get a Z32 AFM.

[T0nyGTSt]

In my case, I have the same Bosch 044 as Jim.

I've added an Apex regulator (it was cheap and I've been told it's identical to the Nismo model which is JECS Unisia anyway).

I'm about to add 550cc drop ins.

I don't need the regulator as I don't think I'll have any requirement to wind up the pressure on the 550cc but I did have a requirement to do it on the stock 370cc.

T.

[SeriesIIGTST]

i have a very similar setup:- 2535 on a 25DET, 910 pump, Z32 AFM, and am using a Nismo FPR which bolted straight into stock position. See sig for power! it works :uh-huh:

[abcent]

im currently running a bigger in tank bosch pump, with malpassi adj. reg., and stock injectors...(microtech LTX-12 computer)...putting out 224kW @ wheels @ 18psi.......on FULL boost this is just maxing out the injectors on 100% duty cycle. It made 238kW on dyno but was leaning out a bit so i'd rather be safe an wound it back a bit for now.

next on list....Injectors....just wish they wern't so damn expensive for RB25's

anyway, hope this is of some help. I believe the reg sits on round 40pound pressure @ idle

[webber]

Hey guys, i have an 040 in my r33 Racecar, i was running one of these in my road car with no drammas, but i am getting a miss from 4500 rmp on, when the throttle is wide open... i have replace the TPS, new splitfires and still i have this problem, i am running std ECU & STD boost while i have this problem, the car is fitted with a front mount and other than that & a 4" exhaust from the turbo, it is dead stock, (splitfire & irrideon plugs). anyway my question is should i be running a fuel pressure reg? is it possible to be supplying too much pressure? i don't tyhink so, but i am buying some new s15 480cc injectors this week, maybe the old injectors are the problem... i don't know as the car only just arrived from japan a few weeks ago

Edited December 2, 2006 by webber