Supercharger

poopcoupe · 04-06-09, 11:19 AM

Has anybody supercharged a 5 pot? Got a supercharger of a SEC Merc and a man who can... Any advice please?

Emjay · 04-06-09, 12:03 PM

no idea if it can but I'll watch this one with some interest

20vcqdriver · 04-06-09, 12:24 PM

Someone on the quattro forum started this and been at it a long time not sure if it is finished yet or not but has been a bit of a nightmare project by all accounts. Will certainly be different once finished.

BW2309 · 04-06-09, 12:27 PM

Few things to look out for. You need to alter the way the fuel tank vent system works, otherwise your charger will pressurise the fuel tank!
I would replace the metering head with that of an early ur due to changes in the flow rates and way it operates with a presurised system. It will need more fuel and the timing advanced, bigger fuel pump and injector's needed. It's all fairly straight forward if it's a K-Jet to be ho9nest. I was going to supercharge my 90 but plans have changed!!! The A6 may have it now though!!!
You will need to give the brakes some vacuum too. If the car's supercharged then at no point will the manifold be in vacuum so your brakes will get none at all! You can get round this with a suction-jet-pump from a TT 1.8T. Its a simple by pass valve that causes vacuum via a venturi and non return valve.
You may need to make a bypass system for boost pressure too that releases boost when you let the throlttle off or you may get terrible shunting when letting off from high revs as unlike a turbo, the super charger will still be producing big boost that the engine cant use. This makes the engine continue to accelarate as some boost will leak past the throttle valve. This is also a problem at idle and part throittle. You only really want it producing boost at high throttle applications.

I shall now be quiet as this post is getting far too long! SORRY!

90Quattro · 04-06-09, 12:35 PM

like this poop??

poopcoupe · 04-06-09, 12:44 PM

Hi Guys, Thanks for all of this. Couple of Questions.
The fuel tank vent system, how do we alter it?
How easy is it to find a metering head from an old UR?
Would you mind if I got my guy to speak with you for more advice?

Cheers

Dom

BW2309 · 04-06-09, 12:56 PM

Quote:

Originally Posted by poopcoupe

Hi Guys, Thanks for all of this. Couple of Questions.
The fuel tank vent system, how do we alter it?

Cheers

Dom

What you need is the carbon canister system from a later (7A's had it) with the electric shut of valves. You need the valves to shut whilst the throttle open or when there's boost and then open at idle or overrun, depending on how you set the system up. This will allow the tank to vent properly without causing issues.
It's simple enough to wire them up to the throttle switch for operation.

You may find your car alrerady has the system and you just need to alter how it works.

90Quattro · 04-06-09, 01:41 PM

I'm going to be running stand alone on mine, even tho you are right K-Jet can take care of it. Going for stand alone so can map it how i want. Plus for the over boost, i'll be using an after market dump valve set-up. Brakes are something i have not thought about yet as don't know what set up i will be using and smoothing the engine bay at the same time.

When i get home ( which is next week

) i will try get some more pictures for you and let you know how it goes.

BW2309 · 04-06-09, 02:27 PM

Brilliant! I'll look forward to the pics!

Martc · 04-06-09, 10:50 PM

Here you go....

http://www.youtube.com/watch?v=JUw8VjsO-9Y

04-06-09, 12:24 PM	#3
20vcqdriver 4 ring whore! Classic Audi Club Member Join Date: Dec 2007 Location: Wirral Posts: 3,910	Someone on the quattro forum started this and been at it a long time not sure if it is finished yet or not but has been a bit of a nightmare project by all accounts. Will certainly be different once finished. __________________ Coupe quattro 1986:-~450bhp + loooong list of mods! Audi A7 Bi-TDI SLine Black edition 2015 mapped to produce 600lb/ft torque! Audi S4 4.2 V8 cabriolet 2004:-

04-06-09, 12:35 PM	#5
90Quattro 4 ring whore! Classic Audi Club Member Join Date: Oct 2007 Location: Hampshire / Stoke-on-Trent Posts: 2,319	like this poop?? __________________ 90 Quattro Project http://www.classic-audi.co.uk/forum/...read.php?t=235 Passat 130 Sport http://www.classic-audi.co.uk/forum/...5830#post15830SOLD http://www.helpforheroes.org.uk/ www.armedforcesrallyteam.com

04-06-09, 12:44 PM	#6
poopcoupe 21 + 19 = OLD! Classic Audi Club Member Join Date: Sep 2008 Location: Saafend! Posts: 1,738	Hi Guys, Thanks for all of this. Couple of Questions. The fuel tank vent system, how do we alter it? How easy is it to find a metering head from an old UR? Would you mind if I got my guy to speak with you for more advice? Cheers Dom __________________ audiless...........

04-06-09, 01:41 PM	#8
90Quattro 4 ring whore! Classic Audi Club Member Join Date: Oct 2007 Location: Hampshire / Stoke-on-Trent Posts: 2,319	I'm going to be running stand alone on mine, even tho you are right K-Jet can take care of it. Going for stand alone so can map it how i want. Plus for the over boost, i'll be using an after market dump valve set-up. Brakes are something i have not thought about yet as don't know what set up i will be using and smoothing the engine bay at the same time. When i get home ( which is next week ) i will try get some more pictures for you and let you know how it goes. __________________ 90 Quattro Project http://www.classic-audi.co.uk/forum/...read.php?t=235 Passat 130 Sport http://www.classic-audi.co.uk/forum/...5830#post15830SOLD http://www.helpforheroes.org.uk/ www.armedforcesrallyteam.com

04-06-09, 10:50 PM	#10
Martc Black Coupe Collector Classic Audi Club Member Join Date: Feb 2008 Location: Towcestershiresheer Posts: 2,934	Here you go.... http://www.youtube.com/watch?v=JUw8VjsO-9Y __________________ 95 UrS6 87 Coupe Quattro

04-06-09, 12:03 PM	#2
Emjay Man Fettler Extraodinaire Classic Audi Club Member Join Date: Jul 2008 Location: Up my own arse blowing smoke Posts: 7,417	no idea if it can but I'll watch this one with some interest

04-06-09, 12:27 PM	#4
BW2309 Banned Join Date: Sep 2008 Location: Derby Posts: 1,245	Few things to look out for. You need to alter the way the fuel tank vent system works, otherwise your charger will pressurise the fuel tank! I would replace the metering head with that of an early ur due to changes in the flow rates and way it operates with a presurised system. It will need more fuel and the timing advanced, bigger fuel pump and injector's needed. It's all fairly straight forward if it's a K-Jet to be ho9nest. I was going to supercharge my 90 but plans have changed!!! The A6 may have it now though!!! You will need to give the brakes some vacuum too. If the car's supercharged then at no point will the manifold be in vacuum so your brakes will get none at all! You can get round this with a suction-jet-pump from a TT 1.8T. Its a simple by pass valve that causes vacuum via a venturi and non return valve. You may need to make a bypass system for boost pressure too that releases boost when you let the throlttle off or you may get terrible shunting when letting off from high revs as unlike a turbo, the super charger will still be producing big boost that the engine cant use. This makes the engine continue to accelarate as some boost will leak past the throttle valve. This is also a problem at idle and part throittle. You only really want it producing boost at high throttle applications. I shall now be quiet as this post is getting far too long! SORRY!

04-06-09, 02:27 PM	#9
BW2309 Banned Join Date: Sep 2008 Location: Derby Posts: 1,245	Brilliant! I'll look forward to the pics!