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Euro fuel head + Leask WUR good for 400whp?

I am curious to know if a Euro fuel head combined with a B. Leask modified WUR and RPM switch will provide enough fuel for 400whp. Has anyone tried this combo on the dyno or with a wideband? The taget would be 400whp in the 11.5-12 A/F range. Lots of discussion but very few facts.

Last edited by Ringmaster; 01-27-2009 at 07:35 PM.. Reason: .
Old 06-22-2008, 08:07 PM
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Crotchety Old Bastard
 
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The stock Euro fuel head is good to about 375HP from what I have seen. You need mods go further and stay below 12.2:1 AFR on boost.
The downside to a modded fuel head (after establishing that you actually need one) is a slight reduction in fuel mileage. If you don't need one the draw backs are many ...
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'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
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Old 06-22-2008, 08:33 PM
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Originally Posted by RarlyL8 View Post
The stock Euro fuel head is good to about 375HP from what I have seen. You need mods go further and stay below 12.2:1 AFR on boost.
I assume you mean 375whp? I would like to be no higher than 12:1 @ WOT under full boost (K27HFS, 0.9Bar, big IC, headers, etc).

Last edited by Ringmaster; 01-27-2009 at 07:35 PM.. Reason: .
Old 06-22-2008, 08:40 PM
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Yes, 375WHP.
There are a few companies that rebuild and modify fuel heads.
The Euro head is different than the US and flows a bit more stock.
Don't know what it costs, I do my own stuff.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 06-22-2008, 08:46 PM
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Originally Posted by RarlyL8 View Post
Yes, 375WHP.
There are a few companies that rebuild and modify fuel heads.
The Euro head is different than the US and flows a bit more stock.
Thank you. Who other than IA does the fuel head mods? Nothing against IA, just researching options.

Last edited by Ringmaster; 01-27-2009 at 07:35 PM.. Reason: .
Old 06-22-2008, 09:35 PM
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The stock pumps will support more than the typically modded CIS. Generally the top for CIS is somewhere between 425 and 450WHP with conventional mods.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 06-23-2008, 05:03 AM
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Stephen said that the modded USA heads will flow more than a modded euro head.
I bought a modded USA head and still have my euro head.
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Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
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Old 06-23-2008, 12:26 PM
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Stephen said that the modded USA heads will flow more than a modded euro head.
Interesting. I wonder how much more and why?
Old 06-25-2008, 06:04 AM
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I have collected a number of extra parts over the last couple years for possible future needs...and I have several fuel heads...one is silver, and the other is black...like it's cast iron. Which is which? Is one the Euro and the other the US? Which one flows more fuel?
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Old 06-26-2008, 11:46 AM
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Here's the website to the guy who's been doing it a long time : http://www.specialtauto.com/index.html

He specializes in Deloreans, but I think they used the Bosch fuel system. In any event, this is where I had mine done long before IA started.

My CIS Euro system provided enough fuel for 415rwhp, but you need a lot of other mods to reach those numbers on a CIS car.

Brian is right about determining if you really need a mod fuel head. Check out your AFRs on a dyno before you spend big money on this mod.
Old 06-26-2008, 04:58 PM
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Chuck,
Mine has a black fuel head, and was determined to be a Euro model... but not all black fuel heads are Euro. I was told to do the magnet test. If it is not magnetic, I think it is Euro - is that right guys, or do I have it flipped? Can't remember. It was a while ago.

Euro flows more fuel than US model.

Rob
Old 06-27-2008, 10:35 PM
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Since I have both sitting in the garage I just went out there and did the magnetic test...the black one is ferrous....the silver one was not magnetic....so what does that mean...which is Euro and which is not? FWIW....I have the stock CIS system in my 87 and it has the silver fuel head on it. It's a factory slant but it has a US VIN so I am making the assumption that the silver fuel head is a US version and not the Euro.....right/wrong????

Actually, I was told sometime back that the silver was the Euro...can someone who knows the real story help out here? I think Kevin at IA would be the guy to ask.
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Old 06-27-2008, 10:44 PM
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AFAIK the black is euro and the silver is USA.

My euro 930 has a black one and the IA modded USA head I have is silver.

The silver looks much better IMO.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 06-28-2008, 04:04 AM
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Black = Euro
Silver = US

Silver/US fuel heads were produced for the 3.3L 930 from 1986-1989, for the 3.3L 965 1990-1993.
All 1978/9 3.3L fuel heads are Black/Euro for all 930s made those years, US included.
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'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
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Old 06-29-2008, 07:08 PM
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Quote:
Originally Posted by Ringmaster View Post
Thank you. Who other than IA does the fuel head mods? Nothing against IA, just researching options.

Does anyone know how much power the stock fuel pump will support?
I too wonder as it seems like if you knew were to get the parts this would be a good gig ! but aside from that I personally don't know hom to send my customers to
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Old 06-30-2008, 05:09 AM
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The stock fuel pumps will support more HP than conventional CIS mods of 425-450WHP.
In my dealings with modded CIS they have never had to updrade the pumps.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 06-30-2008, 06:44 AM
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Quote:
Originally Posted by Ringmaster View Post
I assume you mean 375whp? I would like to be no higher than 12:1 @ WOT under full boost (K27HFS, 0.9Bar, big IC, headers, etc).

Is IA the only supplier for a modified head? Is modifying a Euro head any different to a U.S. head? Any idea of the cost involved?

Thanks
I don't think with the mods listed here that you are close to that 375whp....crank hp maybe..... but that may be a stretch too. I was thinking closer to 360 at the crank with those mods on an otherwise stock 3.3 block.
Did you verify on a dyno, reason I ask is that I have almost identical mods, except running 1.0 bar and I did not expect I made that much power. Would be nice to know.

fredmeister
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Old 06-30-2008, 10:31 AM
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