Cam

Collected my Aeromotive fuel reg (A1000-6 Injected Bypass Regulator, P/N 13109) today (Many Thanks Lee).
The return looks incredibly small bore and was a concern to my tuner. Would enlarging the bore of the return damage the reg or make it no longer function correctly?

Cam

Damo V

its -6 all 3 are the same??

I do believe I saw one which was -8 I think??

Cam

The fittings are but the return hole is about 3-4mm and my tuner was concerned it would not flow enough and considered modding reg.

Damo V

Would these be any better?

http://cgi.ebay.com/ebaymotors/AEROM...93599219QQrdZ1

http://cgi.ebay.com/ebaymotors/New-A...94086351QQrdZ1

Stavros

I got the SX performance one, which is exactly the same, and now I check, yep, the hole inside the reg is fucking small, 4mm or so at most, and the hole into the reg isnt much bigger, seems wierd when you got such big actual fittings on the inlet and outlet

Cam

My tuner doesnt rate SX one but hadnt had any dealings with A1000P reg. As two fuck off pumps will be feeding reg I agree with him that hole is too small. But if the hole were enlarged would that bugger the reg? Thats the $64k question..well 100 quid one really.

Stavros

well only way it could was if the valve in it wouldnt seal once hole was enlarged, and seeing as the thing is only held together with 4 allen key bolts, i cant see it being too hard to find out

Cam

Rods going to have a gander at it over weekend as I don't know how they work or if enlarging hole would knacker it. Its rated to 1000 hp or something but I cant see a 4mm hole returning enough fuel.
Why is it the small jobs take the longest??

Damo V

Id be interested in knowing exactly what is inside

Cam

A diaphragm and a spring apparently

Damo V

is there a seal or O ring between the red and silver bit?

Cam

Can I ask the audience?

stevieturbo

I used an A1000 pump and A1000 -6 bypass reg on my old engine That pump was rated at about 800bhp @ 45psi.

We also have 2 Subarus running the same reg, both with dual Walbro GSS342 pumps, each at 255lph.

There are no pressure issues, the reg works fine even with both pumps running flat out, and the engine at idle. ( which is when the most fuel would be flowing out the return. )

Cam

My fuel system is 2 x 310lph pumps but they run at 6v at idle/low revs then kick to 12v as revs/boost rise just like a std GTR pump.
Can you remember what size the return hole was on your reg?

NUTS RuS

iTrader: (35)

Its not a problem modding them if you feel its necessary. Just watch where the swarf goes.

We sometimes also tap into them to take off another outlet for a second fuel pressure gague on some applications.

Fuel isn't under as higher pressure on return so flow isnt as much of a problem.

The bigger ones in the links above will also have a -6 fitting return, but the inlet and feed is -10

Cam

My one has -6 on all inc return but the size of the return hole (not the fitting hole) will need enlarging from what I understand

stevieturbo

I never measured the hole, but it was small. I did have concerns too, but as its rated for 1000bhp, I assumed it would work fine, and it has so far on both Subarus.
One is using an 8mm OD return, the other a 10mm return to tank, although obviously the hole in the reg is the smallest point in the return.

I'll admit though, when i fitted the new engine to my car, I also fitted a different reg, just in case, as I was expecting to have to use some silly american pump, which flowed enough to empty an oilfield.

But alas, I went for 2 x 044's ( but retained the Aeromotive controller ) and a Magnafuel reg. Its rated for about 2000bhp fuel flow. I didnt measure the hole, but its a lot bigger than the Aero's
It doesnt hold pressure when pumps are off, the Aero regs do. Not that it matters.

If you are running 6v at low rpm, I would be 100% sure you wont have any problems. The dual Walbros at 13.5v at idle will be outflowing your pumps at 6v, by quite a margin i think.

My reg, it has -8 ports all round, flow rated for 2000hp ( i can dream lol )
http://gallery112848.fotopic.net/p13537328.html

http://www.magnafuel.com/products/ef.../MP-9940-B.htm
Mines the 9950

Cam

Cheers for that Stevie. My power aim is between 800-850hp and possibly ultimately getting some NOS to break the 1khp barrier.
Love your car, it must be a riot!

stevieturbo

I think the power estimations are a bit misleading for the regs.

You could only have 100bhp, yet use a pump capable of flowing for 2000bhp. It would be silly, yes. The reg needs to be sized to cope with the pumps flow ability.

The reg will be working hardest at idle, as thats when its flowing the most fuel out the return.
At full power, most of the fuel goes into the engine.

Cam

The reg is going to be running at about its max rating and my concern is not taking any risk of a meltdown thats caused by a cheap (relatively) ancillary item.

stevieturbo

Its such a simple item, I cant see it being a problem.

If you have pumps flowing fuel for 1000bhp, an engine using 800bhp worth of fuel.
Then all the reg needs to cope with is the excess 200bhp worth of fuel when at full throttle. Thats an easy task ?
Its at idle where the problems may arise, and it would only be for running problems. I cant see it causing a danger in anyway.

Aeromotive does have a very good reputation. The only parts that a lot of people dont seem to lie, are their pumps. I ran my A1000 pump for a couple of years, and never had a problem though. I only changed to dual 044's to upgrade, as I didnt think the A1000 would be enough for me.

If it still concerns you, my Magnafuel is a nice reg, and in the overall scheme of things, another $3-400 isnt going to hurt that much.

Cam

I have not found anybody slating Aeromotive pumps just the SX fuel reg. The Magnafuel gear looks gorgeous but I am not really familiar with it but have heard of them before.
I am pretty sure Rod will have dissected the Aeromotive this evening so I'll wait for his verdict.
Again thanks for all the replies chaps.

Stavros

what bad stuff you heard about the SX regs? i never have

externally they identical to the aeromotive jobs, and seen them used on some mega cars

Cam

Rod and Cord tried some and found them unreliable and were not impressed with the internals. I'll ask them specifics of their misgivings when I call in there on Monday.
Wish I had taken my camera today as my motor looks yummy now new turbos/modded HKS manifolds are fitted.

stevieturbo

I prefer the Aero reg, simply as it has a port for a guage. The SX doesnt.
But most of the other guys with Subarus I know of, all use the SX, as thats what their guy supplies. Never heard of any problems with them.
Even the Team Ice RCMS prepared Subaru was using a pair of them.
Which, thinking about it, is a bit odd, as they only had a single feed line for the engine, although it did split to 4 sets of fuel rails, then back to 2 regs... They were also using Dual Bosch pumps.

I use a couple of US forums a lot. Not very people many like the Aeromotive pumps. They claim they are loud, have problems when warm, and have quite a few failures.

The rest of their product range is top notch though.
Most of the big power guys there use Weldon, or go Dual with Bosch/Walbro.

Magnafuel also seems to be good stuff, but not so many using it. Barry Grant also do some big pumps, but I couldnt find much info on fuel injection stuff from them.

The Weldons are expensive, but only thing put me off, is most guys say they are loud. Really loud !!, so for my road car, I wasnt taking a chance. I went for the Dual 044.

Cam

Mine has 2 in tank pumps running 6v initially so there is no fuel pump noise whatsoever but its exhaust volume thats been a pain in the ass to tame and is now delaying the rest of jobs to get my car finished.
Its times like this I think I should have just bought a GT2/3RS Porker.

Stavros

Yay, you know how i feel

Tho my budget isnt that big

Cam

Mid project hiatus blues suck.

Alg1k

iTrader: (2)

The reg not returning enough fuel isnt going to cause a meltdown !
Just try it and see
Watch your fuel pressure If it goes off the scale you have a problem its a bit safer having a bit too much pressure than not enough
At least it wont melt
May bore wash it though
So would need to be sorted straight away

Karl

Cam,

leave the return restrictor std, too many people look at these restrictors and assume that a small size can't flow enough fuel. In fact this is'nt the case as what is actually happening is the restrictor is actually a controlled bleed to control rail fuel pressure and as such needs to be a small orifice to provide accurate metering of the fuel and give stable fuel pressure.

Whilst my car is not at your intended power level my fuel system delivers around 600L/hour the A1000-6 reg has no problems regulating my fuel pressure to 3.5bar @idle when the injectors are obviously at minimum duration and thus return flow is at its maximum.

Hope that helps.

Cam

Alg1k, point taken I mean't damage.

Karl, Cheers for your reply as I now understand why the return hole is the size it is

Cam