Tuna Tech: Fuel Pressure Regulators
 

I post this for people to read, discuss, criticise and make informed descisions.

Part 1 of more to come. Subject to change without notice.

Top read Stace!

Great work!!!!!

One of the best tech articles I've read.

Top effort Stace. Looks like I am off out to the shed to relocate the feed for the fuel reg to the centre of the manifold.

STACE THE MYTHBUSTER!!!!!!! :)

I can see the workshops around town cursing stace
and shares in the companies that make the regulators are losing $

One of the biggest benefit of fitting a aftermarket fuel rail claimed by the manufacturers is the GD models tend to have the problem of cylinder one running lean compare to other 3 cylinders, and the fuel rail will deliver exact the same amount of fuel to all four cylinders through the injectors thus eliminating the problem.

But it seems this problem with cylinder 1 (or cylinder 3 for GCs) is caused by incorrect readings as pointed out by Stace, so if you relocated the fuel regulator line to the centre of the manifold, you would eliminate this problem and save you alot of dole on buying the fuel rail......... good work Stace ....... I think you have way too much time on your hands :rolleyes:

One question, if the boost gauge hose runs off cylinder one on a GD and the gauge itself is accurate and fast enough to register the fluctuations in the manifold pressure, would it give the impression that your car is not holding boost?

Great article Stace!

[QUOTE=CDR RA]Looks like I am off out to the shed to relocate the feed for the fuel reg to the centre of the manifold.[/QUOTE]

Is it easy enough to do yourself? Is there already a place on the centre manifold to connect to? Or do you need a mechanic to do it?

Glen.

Very interesting read indeed, after reading that article i walked out to the carpark and lifted the bonnet to have a look at how its all wired up..

I think i know what im doing this weekend :)

Any specific size tubing?

glad people found it a good read, hope it does some good, the less blown engines the better :)

standard vacuum hose is going to do it, aslong as you get a good seal on both ends of the hose, at present ive got some blue ricey silicon hose doing mine, replacing it with black stuff as soon as i come accross the right price :)

[QUOTE=Rexilla]One question, if the boost gauge hose runs off cylinder one on a GD and the gauge itself is accurate and fast enough to register the fluctuations in the manifold pressure, would it give the impression that your car is not holding boost?[/QUOTE]

if your boost guage flutters, its usually the wastegate solinoid flapping and your boost controller isnt holding / controlling boost as well as it should.

[QUOTE=tuna]if your boost guage flutters, its usually the wastegate solinoid flapping and your boost controller isnt holding / controlling boost as well as it should.[/QUOTE]

It's a MoTec :confused: :( :eek:

When is Tuna tech part 2 coming out? Pls reserve me a copy :D

[QUOTE=tuna]glad people found it a good read, hope it does some good, the less blown engines the better :)

standard vacuum hose is going to do it, aslong as you get a good seal on both ends of the hose, at present ive got some blue ricey silicon hose doing mine, replacing it with black stuff as soon as i come accross the right price :)[/QUOTE]

i thought u got commission on referrals to JWS? less blown engines mean less mulah for u!

seriously nice work. you should consider writing a book.

baaaah baaah
write a book stace !!
tuna-tech-tip-top-tuning-techniques

with the money made from books he can do it the proper way. :P 2.5! :P

Nice cheap and effective mod that'll save an engine if the theory behind it is correct (sounds logical to me). My car has it now....

Just make sure you plumb it correctly and the pipe doesn't come off under boost - I made sure by clamping each end with the tiniest hose clamp I could find.

shit that's awesome man, and my boost gauge is connected to the stock fpr :( how can i fix this ?

[QUOTE=aDe]shit that's awesome man, and my boost gauge is connected to the stock fpr :( how can i fix this ?[/QUOTE]

take it off.

[QUOTE=aDe]shit that's awesome man, and my boost gauge is connected to the stock fpr :( how can i fix this ?[/QUOTE]

Plumb the boost guage into the vaccum line that feeds the blow off valve instead?

Closeup pics of the mod before and after would be fantastic!

if you need close up pics you shouldn't be playing around with your car!

easiest mod on the planet

So displaying pictures is based on how hard a mod is or not? lol - how did you come that belief?
:)

its described in plain english.

Bump.


Was discussing this with Ross today, figured some of the newbs might like to read it.

Nice! was talking about this last night. Thanks! :-D

Thanks for this bump! Ill try to figure it out and do it to my car.

just found this thread through search... sounds like something worth doing (free bump :D)

just about to look for more of your awesome writeups tuna!!! great info...

EDIT: I couldnt find any more articles?!! what happened :confused: :p

[QUOTE=tuna]Next issue; We cover fuel rails, lines, injectors and fuel pumps[/QUOTE]

lets start a fundraiser so stace can write a book.... :read: :whip2:

i never spawned the other pdf's, i'll dig the word docs up and punch them out one day.

just hope i have the pictures still to complement them...

Sorry for resurrecting an old thread but....actually no I'm not sorry, this is an awesome read and something that all newer members should take notice of and fix where necessary.

Got any more Stace??

on my "to do" list to finish off, still gathering the odd picture here and there

but yeah- i have a few more i started,
"fuel systems and injectors" - the follow up to this article
"bovs and gates" - all about making power, easilly

Dr Tuna FTW

It does make for good reading. :)

Paralleling the fuel system is a very cheap and solid insurance. Even if I did go to an aftermarket reg... :p

Brent.
:)

very good read and glad its still available.

Is there a way of tapping into the stock fuel system to monitor fuel pressure or is an aftermarket reg the only way?

Bump. Link fail?

reattached,

cheers stace, i'm going to do mine tonight after reading that :D

Thanks mate

Thanks Stace! Showed ozfoz the link. Very great read!!

A good investigation and entertaining read :p Would never have thought of this without it being pointed out. Seems so obvious now! Thanks for sharing.

Does any1 hav an opinion of which rising rate fuel reg brand to get?
(if you did want to go down that track...)

Sard... malpassi...

2 in and 1 out setup so u can run parallel setup... and maybe tolerant to race fuel...

Ta
Stona

perhaps not bother? unless your building a 600hp drag car