View Full Version : Group A carb
MR TURBO
20-03-2009, 20:04
Right what exactly does a group a carb consist of?? or how does it differ from a standard carb??
27mm venturi for one ,jets changed :)
Adam 005
20-03-2009, 20:26
group A carb was never fitted to a gt turbo by renault
MR TURBO
20-03-2009, 20:27
27mm venturi for one ,jets changed :)
Nice thanks for the contribution anything else anyone know??
bye_all_c_ya
20-03-2009, 21:00
not sure of sizes but ive just fitted gp a carb and also have a rejetted one and wondered which would be better and why if you know
also more info on this topic would help me out too:)
well with my past experience i had a lot of trouble fueling it , and it did not make a big difference , i went back to a standard carb and re jetted and set it up to the correct boost .
i think they are pain but thats my thought on them :)
Rob@Backyardracing
20-03-2009, 21:33
We all have our own style group A carbs :)
group A carbs are just over sized off the shelf tuning items for peeps to plug and play with huge jets giving poor AFR readings through out the rpm range to aid the extra boost and cover the tuners arse from failing cars and come backs... In my eyes anyway....
Most members these days have learnt (from RTOC mainly) how to tune there own carbs to MATCH there OWN cars spec perfectly by doing the correct jetting needed as each car and carb seems to change ever so slightly.
fidos got a raider
20-03-2009, 21:55
It's just a 27 ventuire and hard to set up:crap:
MR TURBO
20-03-2009, 22:19
well my so called group a doesn't have this part fitted :scratch:http://old.rtoc.org/articles/i/autofolder/MURYEEGGITOLNCWQXDPE.jpg
Rob@Backyardracing
20-03-2009, 22:46
Thats odd, you will need that..... accel jet...
MR TURBO
20-03-2009, 22:55
Thats odd, you will need that..... accel jet...
Thats what i was thinking :scratch:
Thats what i was thinking :scratch:
Did you ever use the carb?? If not who ever had it last may have used it for donor parts as previously said you need that
MR TURBO
20-03-2009, 23:04
Did you ever use the carb?? If not who ever had it last may have used it for donor parts as previously said you need that
It's on the car now the standard serviced carb did not want to start the car at all
THE MASTER
20-03-2009, 23:05
group A carbs :laugh::laugh::laugh::laugh::laugh::laugh::laugh:
It's on the car now the standard serviced carb did not want to start the car at all
I take it you put the missing part back in?
MR TURBO
20-03-2009, 23:10
I take it you put the missing part back in?
Not yet as i want to use the standard carb so i will be opening it back up to see if there was reason it wasn't starting....Or i'll pop it back in.....would that be the cause of my boost stutter
THE MASTER
20-03-2009, 23:29
try working out how a carb works :cool:
the fuel is not squirted in it is sucked in, the venturie creats the sucktion :rolleyes:
MR TURBO
20-03-2009, 23:33
try working out how a carb works :cool:
the fuel is not squirted in it is sucked in, the venturie creats the sucktion :rolleyes:
is that text chat :laugh::laugh::laugh:
MR TURBO
20-03-2009, 23:52
Thats odd, you will need that..... accel jet...
What should happen without this??
tiff_lee
20-03-2009, 23:58
What should happen without this??
http://bundaberg.qld.gov.au/arts/images/Seth_boom.jpg
Just a guess?
Rob@Backyardracing
21-03-2009, 00:22
What should happen without this??
Ive never ran without one, but flat spots are poss i guess on gear changes :confused:,basicly it sprays a small burst of fuel with operation of accel peddle, once WOT it does jack...
Group A B Y Z or Fecking D......
Yeah mate group A head innit, I actualy hate ALL that tuner bollox.
Fact a certain member on here sold a carb on ebay... listed it as group A.... and got over 200 nicker...
So lets see shall we what things make it better because its group A?? i mean all round, with all parts that are catagorised.
Shall we crack open the fact or fiction box?
tiff_lee
21-03-2009, 00:45
Fact a certain member on here sold a carb on ebay... listed it as group A.... and got over 200 nicker...
Sounds about right for ebay, inflateaprice.com
Group A B Y Z or Fecking D......
Yeah mate group A head innit, I actualy hate ALL that tuner bollox.
Fact a certain member on here sold a carb on ebay... listed it as group A.... and got over 200 nicker...
So lets see shall we what things make it better because its group A?? i mean all round, with all parts that are catagorised.
Shall we crack open the fact or fiction box?
Basicly one persons perception of "group A" may be different from anothers.
MR TURBO
21-03-2009, 00:57
well by the sounds of it group a or not the accel jet removal does not seem to be right
well by the sounds of it group a or not the accel jet removal does not seem to be right
Getting somewhere:rolleyes:
MR TURBO
21-03-2009, 01:01
Getting somewhere:rolleyes:
Your a funny one :laugh::laugh: kinda unhelpful too maybe betting should stay your fortay instead ;)
....:sad::sad::sad::sad: the Grouping drives me nuts
MR TURBO
21-03-2009, 01:05
....:sad::sad::sad::sad: the Grouping drives me nuts
Well me and that car are going to have serious words come day break :laugh::laugh:
Your a funny one :laugh::laugh: kinda unhelpful too maybe betting should stay your fortay instead ;)
Im actualy very helpful when asked to be, Also very subtle i HINT to the answers. The strong will learn the weak wil perish and sell up... question is how does a standard carb become a magical Group A carb, And what are the different ways to achive Group A status
And actualy MR TURBO aka smart arse, i was getting involved in your question and expanding on it, so people could give you a better answer.... but i see im unhelpful...... wasting my warrior talents on you
MR TURBO
21-03-2009, 01:10
Im actualy very helpful when asked to be, Also very subtle i HINT to the answers. The strong will learn the weak wil perish and sell up... question is how does a standard carb become a magical Group A carb, And what are the different ways to achive Group A status
Feck knows but I want shot of it and standard shizzle back on and working tomorrow....I must be strong then cause i aint ever selling :D:D
MR TURBO
21-03-2009, 01:13
And actualy MR TURBO aka smart arse, i was getting involved in your question and expanding on it, so people could give you a better answer.... but i see im unhelpful...... wasting my warrior talents on you
Easy soldier!!! Don't make me have to reach for my sabre :laugh: Don't worry bro thats why there was a wink on the end
Never under estimate the power of the force.... :cool:
MR TURBO
21-03-2009, 01:24
http://homepage.ntlworld.com/neil_james.bruce/STORMTROOPER.jpg
:laugh::laugh::laugh::laugh::laugh:
rs250nut
21-03-2009, 09:33
Were there not genuine group a carbs fitted to the R11 rally cars. I think they had a longer venturi to compensate for the extra width.
You need to refit that accelerator pump jet for sure. Without it you'll be flooding fuel into the venturi as there's no seal (fibre seal that the jet sits onto the body) to stop the fuel 'leaking' along where the nozzle arm sits, and dumping into the venturi thus so - This'll happen everytime you pump the gas pedal, and hence will be a nightmare to fire up the engine (due to said flooded carb).
If you do magically manage to get the engine to fire, you'll probably find it'll die as soon as you pump the gas pedal - Again, this is because you'll be flooding the venturi with all the excess fuel coming up from where the jet should be.
In short, and to save me waffling further ;) just re-fit it! :D And don't forget the fibre/rubber seal either :agree:
Were there not genuine group a carbs fitted to the R11 rally cars. I think they had a longer venturi to compensate for the extra width.
Yep, that's true, but you'll never find a tuner off the shelf 'grp A' carb looking/modified like that.
MR TURBO
21-03-2009, 09:54
You need to refit that accelerator pump jet for sure. Without it you'll be flooding fuel into the venturi as there's no seal (fibre seal that the jet sits onto the body) to stop the fuel 'leaking' along where the nozzle arm sits, and dumping into the venturi thus so - This'll happen everytime you pump the gas pedal, and hence will be a nightmare to fire up the engine (due to said flooded carb).
If you do magically manage to get the engine to fire, you'll probably find it'll die as soon as you pump the gas pedal - Again, this is because you'll be flooding the venturi with all the excess fuel coming up from where the jet should be.
In short, and to save me waffling further ;) just re-fit it! :D And don't forget the fibre/rubber seal either :agree:
Fibre/rubber seal does that come with the carb service kit??
MR TURBO
21-03-2009, 19:24
Fitted the accel jet back with rubber/fibre seal sounds ok still....Also had a little fiddle and sorted my accel pedal stiffness too :D still need to road test it tho
Just to throw my usual into the mix. I thought grp A carbs were 28.5 mm with a large brass auxillary venturi and choke flap removed.
Back in '98 I made one with a 34mm butterfly and 30mm venturi. It ran, but I never had any feedback on what it was like to jet, or if it really made any difference, for that matter...
MR TURBO
23-03-2009, 10:01
Just to throw my usual into the mix. I thought grp A carbs were 28.5 mm with a large brass auxillary venturi and choke flap removed.
Back in '98 I made one with a 34mm butterfly and 30mm venturi. It ran, but I never had any feedback on what it was like to jet, or if it really made any difference, for that matter...
Now this is what i'm talking about any more differences???
Fibre/rubber seal does that come with the carb service kit??
for some reason this is the one thing that my service kit did not include :(, so i reused the old one.
MR TURBO
23-03-2009, 11:19
for some reason this is the one thing that my service kit did not include :(, so i reused the old one.
I think they do include them just a different colour i only found out this after i had put it back together cause i had left overs then had to pop my accel jet back in and i compared washers and found it so popped in with the jet :D
The works Grp A carb ran a ~25mm venturi. Definitely nowhere near 28.5mm.
You do get a new pump jet seal in the Webcon overhaul kit.
Now this is what i'm talking about any more differences???
:rolleyes: Haven't you realised yet that GrpA doesn't mean anything specific (except for in the works GrpA which are not available). The question you're actually asking is 'what can be modified on the 32dis'.
MR TURBO
23-03-2009, 14:45
:rolleyes: Haven't you realised yet that GrpA doesn't mean anything specific (except for in the works GrpA which are not available). The question you're actually asking is 'what can be modified on the 32dis'.
I think everyone is focusing too much on the title rather than the opening post but in other words yes you are correct with what can be modded.....I also remember years ago there being a recommended jet size for general all roundedness that was good for up to 200bhp i think gt tuning used to sell them as straight replacement
I think everyone is focusing too much on the title rather than the opening post but in other words yes you are correct with what can be modded.....
:agree:
I also remember years ago there being a recommended jet size for general all roundedness that was good for up to 200bhp i think gt tuning used to sell them as straight replacement
:brickwall:
In other words. You've been in the club long enough to know there is no 'general allroundedness' when it comes to fuelling or resultant BHP on the GTT!
MR TURBO
23-03-2009, 15:37
:agree:
:brickwall:
In other words. You've been in the club long enough to know there is no 'general allroundedness' when it comes to fuelling or resultant BHP on the GTT!
Well whatever the jets were they sold me years ago worked a bloody treat would just love to replicate that same carb as i had no issues with it whatsoever
You must have been very lucky if off the shelf carb jets worked for you. Jet it up properly yourself with some means of measuring the afr...
Well whatever the jets were they sold me years ago worked a bloody treat would just love to replicate that same carb as i had no issues with it whatsoever
:laugh:
Go for it.
Now where's that colander. Damn thing keeps falling off my head...
MR TURBO
23-03-2009, 16:44
:laugh:
Go for it.
Now where's that colander. Damn thing keeps falling off my head...
Maybe ya wanna try this instead might fit better :laugh::laugh::laugh:
http://upload.wikimedia.org/wikipedia/commons/0/00/Sieve.jpg
The works Grp A carb ran a ~25mm venturi. Definitely nowhere near 28.5mm.
Are you sure? I did loads of them back then for A&J Tuning and they were all 28.5. I once saw one with the brass (longer) aux venturi and was told that the parts were gen Renault ones.
Alastair
23-03-2009, 18:22
Are you sure? I did loads of them back then for A&J Tuning and they were all 28.5. I once saw one with the brass (longer) aux venturi and was told that the parts were gen Renault ones.
Some more detail on the Works carb would be very helpful in bottoming out this GRP A ****e once and for all...:rolleyes:
So come on - who has one :coffee: Get the verniers and camera out and then auto-cad, time's a wastin...
MR TURBO
23-03-2009, 18:30
Some more detail on the Works carb would be very helpful in bottoming out this GRP A ****e once and for all...:rolleyes:
So come on - who has one :coffee: Get the verniers and camera out and then auto-cad, time's a wastin...
Your right there with group a ****e m8 wish i never bought the bloody thing.....Its all good though i shall be rebuilding to my own specs.....I'm so glad i'm a hoarder and never sold my spares from years ago :D
you still bangin on about the carb...lol
:p
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