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Old 05-10-2002, 10:17 PM
Registered User
Join Date: Jun 2000
Location: Near Williamsburg, Virginia
Posts: 358

Now I know why you are really retiring!
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Old 05-13-2002, 11:16 AM
Registered User
Join Date: Jun 2001
Posts: 24
turbo carb help!

Well ,I still cant tune my weber carb. The turbo functions right.
The fuel bowl is under turbo pressure as reccomended...(it was like this from the begining).
Trying to configure the carb I was testing different -dont know what you call it, I ll try to describe it- little screws on the floor of the fuel bowl which fuel goes through ..
The first part of the double carb has 165 sized fuel screw...the second 185
meanwhile the mechanik was testing the gases from the exhaust pipe and said there was atrofia in the engine,so I
tried every step up until ! 300 sized fuel screw which was made of course by us with a press drill.
The engine behaves always the same.AS SOON AS I OPEN THE 2nd CARB THE ENGINE DIES.
Any idea of what could be the cause of this *@#(--)*@ problem?
Please help with ideas and suggestions.

P.S I was experimenting with air-going through screws of the carb-tried many different sizes- with no result.
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Old 05-13-2002, 07:12 PM
Registered User
Join Date: Jun 2000
Location: Near Williamsburg, Virginia
Posts: 358
Talk to Dave Coleman at DC Enterprises, Summit Point, West Virginia, USA. 304.725.8333. He is an accomplished engineer, has written many articles about turbocharging, is a proficient race car driver, and builds custom turbocharged engines.

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Old 05-14-2002, 06:19 PM
They call me Darth Speed
Join Date: Apr 2002
Location: Hawaii
Posts: 327
Post some pictures

You should post some pictures of your project so we can see if we see anything wrong.

When you say you open the secondary side the engine falls flat?

on the DGV you may have to drill out the accelerator pump to
.55 mm standard is usually .35mm The Main Jets should be about
1.55mm Primary and 1.65mm Secondary make sure you use accurate drill bits. Air correction Jets 170 and 190 should work fine.

What is your fuel pressure? your fuel pressure also has to rise with the boost.

Idle= 3.5 psi Fuel Pressure
1 psi Boost = 4.5 psi Fuel Pressure
4 psi Boost = 7.5 psi Fuel Pressure

If you try to run 4 psi fuel pressure and get 4 psi boost your fuel pressure will be ZERO and no fuel will get in the bowl.

Lotus used a rising rate regulator and it cost about $45.00
let me know if you need to know where to get it from.
WARNING: Bastard Mercedes Builder/Tuner
Sorry if I don't answer your email or questions
I don't check here too often.
I am normally on the board.
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