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changing carbies
https://www.ausmini.com/forums/viewtopic.php?f=2&t=8093		 Page 1 of 2
Author:  meeni [ Tue Jun 14, 2005 10:01 pm ]
Post subject:  changing carbies
hey guys, im sick of tuning my twin s.u's so im going to put a single 1.5 ich on, will this defect my power in any way? i dont think it will do much cos the engine is stock but what do you think?
Author:  Harley [ Tue Jun 14, 2005 10:46 pm ]
Post subject: 
Look, I know you still get that warm fuzzy feeling inside (or somewhere else 8) )
whenever you grab the mower, weed wacker or any other device with a carb on it,
but there are other things in the world besides working out how to make a car you can't
use go faster. You're only 14, we can forgive you.

That being said, I prefer reliablility over a 3% power gain, since I don't want to be tuning my car more than driving it. That is something you will have to play with later on down the track yourself and decide what is for you.

And don't get too excited, but a single carb can be just as powerful (or more) than twins, in the right set up.
Author:  meeni [ Tue Jun 14, 2005 10:50 pm ]
Post subject: 
meeni will be at some hillclimbs soon so im using it for that, not many though, dont wanna screw it in!
Author:  mini_van_1970 [ Tue Jun 14, 2005 11:04 pm ]
Post subject: 
SEAN I think that you are missing the point here big fella but you can't drive legally at the moment so there is no point worring about the power of you mini if you can't use it so if you only want to use a HS2 then so be it but the remaining factor is , that your car aint going nowhere till you have got your license so don't worry about it.

Pat

My 200 cents worth any way
Author:  gafmo [ Tue Jun 14, 2005 11:18 pm ]
Post subject: 
You are all missing the point...Meeni can run at CAM's even't if he get his Lience with Hill climb;s and Karna's

going by the info I rember 1 1/2 will look after youi but get it dyno'd for the correct needle and mixture :wink:
Author:  meeni [ Tue Jun 14, 2005 11:23 pm ]
Post subject: 
cheers gafmo!! yes im gunna give meeni a bit of a run around in some hill climbs only club ones nothing special cos i dont wanna dent him, next year i will start racing properly with a second mini!
Author:  simon k [ Wed Jun 15, 2005 11:49 am ]
Post subject:  Re: changing carbies
meeni wrote:
hey guys, im sick of tuning my twin s.u's so im going to put a single 1.5 ich on, will this defect my power in any way? i dont think it will do much cos the engine is stock but what do you think?


you'll make better power with an 1 3/4 over twin 1 1/4's, 1 1/2 [edit from 1 1/5 - that'd be way small!] will be about the same, maybe a bit less - proper tuning is always the key. How did you go tuning them after the last topic you posted (stalling)
Author:  Harley [ Wed Jun 15, 2005 11:52 am ]
Post subject: 
Obviously it didn't work if he's now considering a change.
Author:  h0nk [ Wed Jun 15, 2005 11:55 am ]
Post subject: 
Would twin 1 3/4 SUs be too big for a 1100?
Author:  simon k [ Wed Jun 15, 2005 11:57 am ]
Post subject: 
h0nk wrote:
Would twin 1 3/4 SUs be too big for a 1100?


yeah, you couldn't get them lean enough for it I reckon.... and just not enough vacuum to get any decent airspeed unless it's a full race motor
Author:  czerial [ Wed Jun 15, 2005 12:38 pm ]
Post subject: 
im no expert,but i was speaking with Graham Russell the other day
and he reckons the 1 3/4 would be fine, if not great for an 1100....

but depends on lots i guess. id put one on if i was you
Author:  Mini Mad [ Wed Jun 15, 2005 12:45 pm ]
Post subject: 
I assume your talking about a single 1 3/4 there chris?

Twins would be way too big...

I used to run a 1 1/2 SU...it was OK, wouldn't go much past 5k easily, but it'd do it..going by that, a 1 3/4 single would be about perfect ;)

As with anything good tuning is a must, it just makes such a big difference..
Author:  Spaceboy [ Wed Jun 15, 2005 12:53 pm ]
Post subject: 
yeah, i'm running a 1 1/2" Su too, and its too small for my engine..
But it is more than enough for a standard 1100, even with a stage 1 upgrade.

i'd say take your mini to a mini specialist to get it tuned, you'll find that there'll be just as much screwing around to get the single su installed and tuned as there is just tuning whats on there.

It takes 30 mins to tune my car.. so maybe 45-60mins to tune twins.. we're talking somewhat less than a hundred quid here.. And no headache.
Author:  Mini Mad [ Wed Jun 15, 2005 1:18 pm ]
Post subject: 
I would spend the money on the twins you have and get them rekitted and tuned properly by someone who knows what they are doing and preferably on a dyno with a/f ratio.
Author:  71_mini_k [ Wed Jun 15, 2005 1:26 pm ]
Post subject: 
Hey Meeni,

If you already have twin 1 1/4 SU's I would stick with them. Once they are properly setup they should not need to be fiddled with all the time.

I have had my on for just over a year and I have not had to re-tune them since I fitted them, and they still run exellently. I would, however, like to point out that I fully reconned mine before installing them.

What method are you using to tune them? and what condition are they in?
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