In the last week alone i have had two cossies in with nice shiney ebay purchased fuel pressure regulators fitted,

interestingly both cars also had seriously dangerous afr on boost.

the answer.The fuel pressure regs do not correctly increase pressure when boost is applied to them!

this is becomming more and more common with the spurt of cheap regs being sold for peanuts on ebay, so i thought i would give you a heads up which may save at least one of you an engine

they dont work guys, buy the real deal, they are cheap for good reason!

 

I remember a spate of these a few years ago when I had my last Cossie James - a few melted engines later and people stopped using them for a while

 

it seems they are back!

 

fse power boost valves?

 

not that brand,

one was a copy aeromotive,

 

Yea the FSE FPR seemed to get a poor write up a while back... a couple Subarus up here went tits up due to these.


Cheers,
Grant

 

No, they are very similar to the Aeromotive items. Red anodised and polished aluminium finish. They don't have the aeromotive logo on them and having tested one myself with a 2 bar reference pressure into the vacuum nipple, we only saw a 0.5 bar increase in fuel pressure.

The standard weber item increases fuel in a 1:1 ratio, so for every 1psi of boost pressure in the inlet manifold, the regulator increases the base fuel pressure by 1psi.

The reason for this is to overcome the differential pressure caused by the positive pressure in the inlet manifold resisting the fuel exiting the injectors.

The two cars we've seen have both been lean enough to melt!!!

 

pikeymotive

 

is the problem because they do not rise at the same level as your chips expect it to ??

or they are just not rising at all when on boost

 

Is it one of these:
http://cgi.ebay.co.uk/AEROMOTIVE-STY...item1c0d311ef8
Rich

 

Barely rising AT ALL.

As said, when i went from atmospheric pressure to 30psi in 2psi intervals while testing one, the increments in pressure were minimal. I saw a 7psi increase with 30psi fed into the reference nipple. That 7psi should have been 30...

 

the one i had in today did raise rate, but the rate was not fixed, it was all over the place

the one will is talking about didnt raise 1-1 which is whats needed on a yb it was way under pressure on boost

 

It would be unprofessional of me to say that it is that exact one, however, it did look very similar and the fact the advert states it is an aeromotive COPY would concern me.

I'd avoid taking chances and melting my engine and buy the genuine thing. Might be Ł100 more, but its a whole lot cheaper than an engine rebuild!

 

the other thing to think about is the people that have fitted these, but they are working in some fashion at the moment...i have no doubt lots of people are using them,

the next time you come on boost will it work? or will you melt your engine? its a risky game having them on any turbocharged/supercharged engine imo, the next squeeze onto boost may be the last

 

i think thats a good Passion Ford TopTip

 

Can you buy the genuine ones though at the moment ? I seem to recall people having difficulty getting hold of them a few weeks back?

 

a genuine aeromotive, sard or the like will be fine if the ford ones are hard to get...

 

how do you test them?

i have an xs-power one that looks identical to that, its a few years old tho.

fit a bicycle pump to the brass nipple and pump it up?

i have a guage fitted to mine and it does get 1 bar when cranking, but the engine doesnt run to find out any more.

 

James , which type do i have hun.

Steve

 

you have the real one, the one the pikeys are trying to copy...badly lol

i would never buy shite!

 

the one i had in today also had a gauge....which was juat as inaccuate as the reg

to test it simply run it at a set base pressure, ie 3.5bar, pipe off,

then apply a caliberated amount of pressure to the reference nipple,ie 1 bar

the fuel pressure should raise 1:1, so in this example it would be 4.5 bar

make sure you use a caliberated fuel pressure gauge... not the one supplied on the reg!

 

the engine doesnt run yet

is there a way of testing without it running?

 

Steve

 

im sure you could find a way lol

if you can run your pump then you can base test it

 

yes i can run the pump, but then i cant get an accurate measure of the extra bar of air to put in. i have an old bicycle pump but fook knows how accurate that is

 

do u sale the proper one james?

 

bike pump, i can just see you pumping away

you need an accurate air supply of some type, otherwise the test is pointless,

 

the std ford fitment one?

 

ill try and set the compressor to a bar then, dont know if it will go that low tho.

cheers for the help james

 

good info james ,cheers



cheers james

 

no probs,

its a good test if you can increase the boost pressure from 0 through to 2 or even 3 bar, then you can see just how accuratly the reg raises rate...or not lol

you can imagen our reaction when we tested one through to 2 bar boost and it only raised rate by 0.3 or so

 

It wasn't particularly repeatable on a family forum James...

 

heres a real aeromotive reg with no fitting included

, you can hardly tell the difference but the price says something being Ł90 cheaper with fittings and braided fuel hoses . mine cost around Ł170 from webster race engines

 

Webster Race Engineering only sell genuine Aeromotive. It's where all of my Aeromotive fuel system came from!

 

how about one of these cheapies on a n/a engine though? what is the fuel pressure supposed to do on a n/a engine throughout the rev range?

 

Reference vaccum and atmospheric pressure.

I didn't test it's vacuum properties - the rising rate under boost was the concerning factor!

 

Fucking scary ... Good bit of info

 

Its scarey the things people try and save money on sometimes.

Secondhand 2wd reg for 30 quid or whatever is the way to go if you must save money on such an important thing.

How anyone can think a cheap copy regulator is an "upgrade" from the standard one just cause its more shiney is beyond me, lol

 

The differential is meant to stay the same, so effectively when the pressure doesnt rise the differential drops.

It WOULD be possible to map round it, but you'd need fecking massive injectors and the spray pattern would be compromised.
Then if it changes, which lets face it on something so poorly made its likely to, its then game over anyway of course!

 

because people are stupid and think "aeromotive style" will mean it actually works rather than looks shiney.

does seem pretty dumb to cut back on something so engine safety critical!!