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nnn nnn is offline
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How do you tell EURO CIS?

Just curios if mine may be Euro..... Previous owner didnt know and I showed someone the other day and he thought it was........







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1988 Factory Slant

Last edited by nnn; 12-11-2009 at 01:07 PM..
Old 12-11-2009, 12:55 PM
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Thats a USA fuel head and injector lines not a rest of world or euro CIS.

You can tell because it is a smooth cast aluminum fuel head, it has a pulse valve for the lambda emissions system, and it has the skinny USA injector lines.

There are a couple other small diferences in the top half of the casting but it's difficult to see them in that pic anyway.

The euro head is always painted black, has a rough finish on the exterior, is made of cast iron so it weighs several pounds more, and does not have fittings for the lambda pulse valve.
Old 12-11-2009, 01:13 PM
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Thanks...... This really is a great forum..... Long time lurker..
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1988 Factory Slant
Old 12-11-2009, 01:17 PM
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JFairman is spot on.... That is definately a US fuel system
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Old 12-11-2009, 01:17 PM
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Another dead give away is the euro fuel heads are painted black

Doh...just noticed Mr Fairman already said that....
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Jonathan.
87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
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Old 12-11-2009, 02:24 PM
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So.....Euro = better??? Or is it just a marketting scheme just like buying French milled soap, German beer or Scotch whiskey. If it was made off-shore in the "old country", it's automatically better. OK, I hate deceptive marketing - can you tell?

I presume Euro fuel heads flow more fuel. Is that the only benefit?
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Old 12-11-2009, 02:44 PM
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The euro one flows more fuel i believe
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87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
Old 540 BMW, XB12S Modified, for being a total hooligan
Old 12-11-2009, 03:01 PM
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The presumption is that: yes, the euro fuel head and system flows more fuel. The injectors have a different part number, the metal fuel lines form the fuel head to the injectors are bigger and the fuel head is different. This is a comparison between a stock "US" system and a "euro or ROW" system.

I would venture to say that doing a fuel head mod to the US fuel head would give you the same results or possibly even more fuel then the stock Euro system. add in an adjustable or digital WUR, and you have the potential for around 400 to 450 hp at the crank ( with cams, twin plug, I/C. turbo, headers, and other mods).

You can get the CIS system to flow a crap load of fuel...but the problem is to get consistant A/F 's as well as drivability
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Old 12-12-2009, 02:34 AM
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I sent my euro fuel head to IA to flow more fuel, he sent me back a modified US fuel head and told me it will flow 20% more fuel than the Euro one. I was led to believe the US ones can be modded to flow more fuel than a modded Euro head, not sure why, or whether that's true?
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Old 540 BMW, XB12S Modified, for being a total hooligan
Old 12-12-2009, 02:52 AM
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Yes it is true that a US head can be modified to flow more fuel than the Euro head.
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Old 12-12-2009, 06:57 AM
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Doing some research but was wondering about the UTCIS-PT unit. Can't you add more fuel with this unit? Thanks
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Old 12-24-2009, 02:44 PM
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Quote:
Originally Posted by Porschepilot79 View Post
Doing some research but was wondering about the UTCIS-PT unit. Can't you add more fuel with this unit? Thanks
You can only lower control pressure so far, which can be done with either the UT unit or with an adjustable WUR. When lowering control pressure further makes no difference you can raise system pressure to add more fuel, but only so far. Then if you are still short of fuel you can have the fuel head modifed for more flow.

If even more fuel is needed then you really want to be looking at EFI as you are getting pretty up there power wise, which will be creating a lot of heat and stress, and you will want better control of everything, not just fuel
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87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
Old 540 BMW, XB12S Modified, for being a total hooligan
Old 12-24-2009, 09:48 PM
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Quote:
Originally Posted by RarlyL8 View Post
Yes it is true that a US head can be modified to flow more fuel than the Euro head.
Brian, the point i was trying to make was that i was told that a modded US fuel head will flow more than a "modded" Euro one. Not sure why that would be the case, if it's even true?
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87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
Old 540 BMW, XB12S Modified, for being a total hooligan
Old 12-25-2009, 02:50 AM
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Anyone have a picture of the Euro CIS to show the difference between euro and US?
Old 12-25-2009, 04:08 AM
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Cast aluminum modified USA fuel head on the left and a cast iron Euro/rest of world fuel head on the right.
the part number tag of the euro head.
the IA/flowtech head is now part #007



Old 12-25-2009, 11:13 AM
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This is a typical Euro fuel head installed:



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Old 12-25-2009, 11:20 AM
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Quote:
Originally Posted by JBL930 View Post
You can only lower control pressure so far, which can be done with either the UT unit or with an adjustable WUR. When lowering control pressure further makes no difference you can raise system pressure to add more fuel, but only so far. Then if you are still short of fuel you can have the fuel head modifed for more flow.

If even more fuel is needed then you really want to be looking at EFI as you are getting pretty up there power wise, which will be creating a lot of heat and stress, and you will want better control of everything, not just fuel
I see so how much horsepower can the Fuel Head Mod support with a UT unit? Do the injectors ever become a bottle neck for fuel? How about the fuel pumps? When do they start hitting there limits? Thanks!
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Old 12-25-2009, 11:44 AM
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A modified USA fuel head can support ~425whp. The most I have heard of is ~450. Anything past 400whp takes a lot of tuning and modification. Adjustable WUR is mandatory.
The fuel pumps and injectors can support much more. The bottleneck is likely the air metering plate. The AFR see-saw of the WUR begins to degrade at the extreme ends of the operating range, off boost and redline. You get one or the other but may not have both.
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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 12-25-2009, 07:28 PM
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Have a US 78' 930, and can see that it has the black euro iron CIS fuel head.
The engine is 930/61

Was the US distributer only installed in US california cars, or has mine been updated with euro fuel head?

Does unfortunately not have much history from seller.

Last edited by totle; 12-27-2009 at 01:26 PM..
Old 12-27-2009, 01:23 PM
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The aluminum fuel head was not introduced to the USA until 1986. All 930's had the black Euro fuel head up until that point.
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'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 12-27-2009, 01:46 PM
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