SilverSFR

I have seen the carbureted 350 conversion, but i looks to be a porsche v8 under the hood. Anyone seen this before?

Porsche V8



SilverSFR

Kevin in Atlanta

Probably 4 throttle bodies, not carborated. Nice setup. Weisach limited edition 928S with the gold anodized wheels to match.

Drewster67

They're carbs. Awhile back, this set up was advertised on Ebay. The owner claims better performance with this set up vrs stock FI.?

I would like to run it on a track car just to see the difference.

Drewster67

Pretty Cool

Gregg K

What a trip. Huh. Wow. I sit here scratching my head. Don't know what to think.

Kevin in Atlanta

I remain unconvinced, but I've been wrong before. Where are the bowls? That setup seems too narrow to be carborated. Sure would like to see it without the air filter assembly.

Mark

They are DEFINITELY carbs....most likely some downdraft Weber's. Save the pic and open it in a photo pgm and zoom....VERY interesting linkage setup.

Rufus Sanders

Throttle bodies would make sense since "our intakes are restrictive" but what would be the advantage of removing EFI and putting on carbs? - Ruf

Lizard928

Agreed definatly carb setup, and if you look at the carb closest to the driver (if US car) you can see the bowl sitting on the inside, also if they were individual throttle bodies where are the injectors, there are none, also normally if they are throttle bodies they are strickly for track use and only have velocity stacks coming out of them, and per the benifit of carbs a tiny bit more power but less effiective meaning more fuel consumption, also it means more contamination in the oil and out the tail pipe.

and it is either webers or PTO(???) and I do like that throttle linkage setup it is very well done, overall a good track setup

only thing i would have done is put a filter over the timing beltcover holes

Dennis Wilson

Those are Del Toro's (carbs). They are sold quite often to replace the CIS FI on older German cars. There are problems created when installing them due to vacuum/cam systems. As the picture shows a new ignition system with mapped advance is required. Another problem is vacuum for the power brakes etc. If you pull all of the vacuum off of one plenum, those two cylinders will be down on power, so lots of plumbing and check valves will be required. The last problem is the cams. Since they were designed for a particular FI system the power gains will be mimimal until they are changed (both duration and lift). European Car Magazine did a step by step modification/dyno on a 924 a few years back. There was no real gains with this set up until changing to Euroraces X1 carb cams. Don't think I have heard of anyone making this type cam for the 928.

IMO switching to carbs is a step back in engine fuel management.

Dennis

atb

That is Steve Tuckey's 84. He has submitted a full write up to 928 Forum Magazine on his Weber replacement for the stock L-jet F/I complete with before and after dynographs. He is marketing a kit which will be introduced in the article. There was a gain in HP with the install.

2V4V

I would have to agree with Dennis, though I think the phrase "step backward" is a bit generous.

EFI is the only way to go, short of a top fuel type dragster where your just kinda spraying fuel in at a ridiculous rate with a constant flow system.

Carbs are stone age technology. A properly set-up injection system will always out-do any carb system, bar none. Carbs were a stepping stone, much like points and condenser ignition - if you like 'em for your retro-ride, hey that's cool, but you leave a lot of HP and TQ on the table, let alone driveability, fuel economy and emissions.

Individual throttle body control and throttle-less intake management (by varying the intake valve opening) is the present/near term future for intake tech on performance cars.

Common rail, high pressure direct-injection is the future. Now that we have the electronics and manufacturing processes to make it viable in the mass-market, it's only a matter of time before all new cars will be direct injected.

The future is coming...

Greg

Drewster67

Do you have a release date for the issue/article?. Or a link?.

TIA

GlenL

Dual quad tunnel ram stickin' through the hood!

That's the ticket!

IIRC he claimed like 12hp increase in the eBay ad.

Vilhuer

Wasn't first test version of 928 engine 5 liter with 4 barrel carb? Think there's picture of it in Project 928.

Regards,

Erkka

1992 928 GTS 5-speed brown oil-water mix injected
Oak Green Metallic 22L
Classic Gray MX