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Posted by: Porschef Aug 13 2012, 01:11 PM

If you've got this arrangement, what are you getting for MPG's? Curious to see how you do.

Thanks.

Posted by: 76-914 Aug 13 2012, 01:16 PM

At 52 hours TT on engine with passenger; 80-90 mph hiway and 120 miles city driving. Total miles 996 miles. Got 37 mpg.

Posted by: vw505 Aug 13 2012, 02:44 PM

Is that with carbs or F/I ?

Posted by: Porschef Aug 13 2012, 03:25 PM

Ljet. She ran great this past weekend, 400 miles each way. I'm just not thrilled with my uh, fuel economy....

37 mpg is incredible!

Posted by: hcdmueller Aug 13 2012, 03:31 PM

Last summer I was getting somewhere in the low 30's at 85ish on the autobahn. The Germans put ethanol in their fuel now so it could be better. I am running D-Jet and have the mps adjusted to run pretty close to 14:1 at cruising speeds.

Posted by: The Cabinetmaker Aug 13 2012, 03:34 PM

D-jet. I'm getting 25 in town and around 32 highway. That is, when I can keep my foot out of it.

Posted by: Valy Aug 13 2012, 04:32 PM

Don't expect better fuel economy than stock.
After all, more power=more fuel.

Posted by: euro911 Aug 13 2012, 05:01 PM

I have to fix my ODO and the the A/F dialed in so I can find out ...

Posted by: Porschef Aug 13 2012, 05:30 PM

Well after the 800 mile weekend excursion, I was getting 23 mpg on the highway....kinda low in my estimation. At 4 bucks a pop for a gallon of 93, it adds up.

It's still a blast to drive, although I really need to get an AFM installed.

Posted by: r_towle Aug 13 2012, 06:39 PM

sounds like it running to rich.

Posted by: lotus_65 Aug 13 2012, 07:08 PM

I'm running a 9580/w carbs, and my mpg's suck!

Posted by: euro911 Aug 14 2012, 01:47 AM

Mine has a 9580 as well

Hoping the Carb Clinic on the 25th. helps to get it dialed in. Ordering 32mm venturis and some additional sets of main jets today. I'll report back.

Posted by: rwilner Aug 14 2012, 07:28 AM

Be careful if you lean it out at cruise to watch your head temperatures.

I don't have that combo, but I get my coolest temperatures around 13.5:1 at cruise, which yields around 28-30 mpg highway. I could go leaner and get better fuel economy but it's worth it to me to keep the engine cooler / last longer.

If this was my only car I might experiment with a leaner cruise, but since it's the "fun car," this compromise is ok.

Posted by: wndsrfr Aug 14 2012, 07:09 PM

" At 4 bucks a pop for a gallon of 93, it adds up. "

I'm running my 2316 with Raby 9560 cam, SDS injection & ignition & A/F/KA/S/Z gearing and can't seem to do better than 8mpg at DE's. At over $8.00 per gallon for 100 unleaded you're right it adds up--like a dollar a mile! And averaging about 60 works out to a dollar a minute.....definitely worth it!

Posted by: lotus_65 Aug 15 2012, 06:59 AM

Let me know how it works out. I have a narrow band o2 sensor, but it's useless. I'd invest in a wide-band (I am now) first and maybe a couple cht's (1-per side).
Good luck!

Posted by: euro911 Aug 15 2012, 09:57 AM

I'm not hep to all of Raby's cams. Is the 9550 a carb cam, or an FI [compatible] cam?

Posted by: Valy Aug 15 2012, 10:17 AM

It's the famous Webcam #73 + 5deg on exhaust to help keep heads temp down.
It's good for both stock FI and carbs, although you can use a cam with more overlap with the carbs.