Lets talk carbs

3xpendable · Post by **3xpendable** » Mon Sep 17, 2012 12:35 pm

For the 3.9 Rover V8 I plan to fit in my engine bay whats best? I had intended to use a Holley 390 4 barrel but i've heard the Weber 500 is much better for mild and fast road use.

Arguments for each below please...

ChrisJC · Post by **ChrisJC** » Mon Sep 17, 2012 7:21 pm

SU's pretty good too!

Chris.

kev_the_mole · Post by **kev_the_mole** » Tue Sep 18, 2012 9:12 am

IMHO quad Webers. One choke per cylinder seemples

Webcon now do my setup for the RV8

Flying Phil · Post by **Flying Phil** » Wed Sep 19, 2012 7:42 am

Or go quad IDFs but you need a bigger scoop!

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kiwicar · Post by **kiwicar** » Wed Sep 19, 2012 9:43 am

If it has to be carbs then either Phil's or Ian's carb porn is going to be best by far, the webber carbs are vastly more tunable than the 4 barrels and far better made, trouble is that is reflected in the price. For anything below a genuine 210 bhp on a 3.9 then SUs on a prepped and correctly matched standard manifold will give the best results for a given price (provided the SUs are in good condition). Otherwise a standard injection manifold and an aftermarket ECU will beat any 4 barrel hands down on performance fuel economy and price.
Best regards
Mike

Flying Phil · Post by **Flying Phil** » Wed Sep 19, 2012 7:54 pm

I actually will be selling the 4 X 36 IDFs as I now have 4 x 40 IDFs...... You could also try a twin 38 DGAS set up on an aluminium Hi- Rise manifold

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