how to get the most power out of a gt-2

For all Carb and Injection engines, standard or modified plus non-standard engine transplants. Heads; Blocks; Cooling (including heater issues related to the cooling system); Mounts etc
Forum rules
Hints, tips and guides for repair and modification - the FAQ section on the main website is worth checking first for information relating to common faults and technical help. Useful posts and guides will be added to the FAQ http://www.sciroccoregister.co.uk/scirocco-faq
User avatar
bengould
Posts: 805
Joined: Fri Jul 09, 2010 1:25 pm
fill in the right answer: 10
Location: Renfrew.

Re: how to get the most power out of a gt-2

Post by bengould »

A correctly set up pierburg will provide more power as it is a larger diameter than a weber. A weber produces better throttle response because you directly control the second stage whereas the pierburg second stage relies on the vacuum to open it. This has been argued many times but the facts remain the same, more air/fuel in = more power out. Most people use a weber carb because it is simpler to set up and a badly set up carb will produce less power. Just because you don't know how to use it doesn't mean it's worse. And just for the record I use a weber carb on mine.


Image
donjon
Posts: 12
Joined: Tue Jul 05, 2011 6:04 pm

Re: how to get the most power out of a gt-2

Post by donjon »

I accept all your points about the pierburg being fine when I is new and set up correctly, but with a view to performance new vs new the weber would still come out tops. The weber has bigger butterfly's than the pierburg even though the physical size of the carb is smaller so it will provide a performance increase if correctly installed.


Nate
Posts: 4045
Joined: Thu Apr 02, 2009 10:37 pm
fill in the right answer: 10
Location: Cirencester / Swindon

Re: how to get the most power out of a gt-2

Post by Nate »

Pierburg has 2x34mm chokes, weber has a 32 and a 34. Granted 2mm sing gonna make much difference, but size matters


Image

Check out my photostream on Flickr
'69 bay, '79 bay, '74 bug, '78 GLS, '91 GT2, '10 SAAB 9-3
User avatar
Mr Funk
Posts: 2131
Joined: Wed Apr 01, 2009 6:39 pm

Re: how to get the most power out of a gt-2

Post by Mr Funk »

Image

Honestly? Having run both (knackered and properly set up) I can honestly say that the differences are negligible. The Weber has slightly better pickup in my experience but that's it. It MAY have bumped the BHP but you have to keep in mind that they normally replace 30 year old kit and even then it was barely noticeable, to its credit I did find it easier to maintain and smoother, again this was probably due to the old kit being very old. We're talking about 90bhp cars here, not Bugattis.
Injection cams, four branch sand a decent weber would see you through, failing that buy an injection.


Head of Complaints - Big Pie Cartel
If it sounds like it's naughty, it probably is.
Post Reply