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  1. #1
    Non-member MR TURBO's Avatar
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    Group A carb

    Right what exactly does a group a carb consist of?? or how does it differ from a standard carb??

  2. #2
    Non-member gtmatt's Avatar
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    Re: Group A carb

    27mm venturi for one ,jets changed

  3. #3
    Non-member Adam 005's Avatar
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    Re: Group A carb

    group A carb was never fitted to a gt turbo by renault

  4. #4
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Quote Originally Posted by gtmatt View Post
    27mm venturi for one ,jets changed
    Nice thanks for the contribution anything else anyone know??

  5. #5
    Non-member bye_all_c_ya's Avatar
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    Re: Group A carb

    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

  6. #6
    Non-member gtmatt's Avatar
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    Re: Group A carb

    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

  7. #7
    Non-member Rob@Backyardracing's Avatar
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    Re: Group A carb

    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.

  8. #8
    Non-member fidos got a raider's Avatar
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    Re: Group A carb

    It's just a 27 ventuire and hard to set up

  9. #9
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    well my so called group a doesn't have this part fitted

  10. #10
    Non-member Rob@Backyardracing's Avatar
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    Re: Group A carb

    Thats odd, you will need that..... accel jet...

  11. #11
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Quote Originally Posted by Rob@Backyardracing View Post
    Thats odd, you will need that..... accel jet...
    Thats what i was thinking

  12. #12
    Committee, South East Regional Rep James5's Avatar
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    Re: Group A carb

    Quote Originally Posted by MR TURBO View Post
    Thats what i was thinking
    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

  13. #13
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Quote Originally Posted by James5 View Post
    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

  14. #14
    Honorary Member THE MASTER's Avatar
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    Re: Group A carb

    group A carbs

  15. #15
    Committee, South East Regional Rep James5's Avatar
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    Re: Group A carb

    Quote Originally Posted by MR TURBO View Post
    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?

  16. #16
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Quote Originally Posted by James5 View Post
    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

  17. #17
    Honorary Member THE MASTER's Avatar
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    Re: Group A carb

    try working out how a carb works
    the fuel is not squirted in it is sucked in, the venturie creats the sucktion

  18. #18
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Quote Originally Posted by THE MASTER View Post
    try working out how a carb works
    the fuel is not squirted in it is sucked in, the venturie creats the sucktion
    is that text chat

  19. #19
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Quote Originally Posted by Rob@Backyardracing View Post
    Thats odd, you will need that..... accel jet...
    What should happen without this??

  20. #20
    Non-member tiff_lee's Avatar
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    Re: Group A carb

    Quote Originally Posted by MR TURBO View Post
    What should happen without this??



    Just a guess?

  21. #21
    Non-member Rob@Backyardracing's Avatar
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    Re: Group A carb

    Quote Originally Posted by MR TURBO View Post
    What should happen without this??
    Ive never ran without one, but flat spots are poss i guess on gear changes ,basicly it sprays a small burst of fuel with operation of accel peddle, once WOT it does jack...

  22. #22
    Non-member JRP's Avatar
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    Re: Group A carb

    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?

  23. #23
    Non-member tiff_lee's Avatar
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    Re: Group A carb

    Quote Originally Posted by JRP View Post
    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

  24. #24
    Non-member JRP's Avatar
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    Re: Group A carb

    Quote Originally Posted by JRP View Post
    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.

  25. #25
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    well by the sounds of it group a or not the accel jet removal does not seem to be right

  26. #26
    Non-member JRP's Avatar
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    Re: Group A carb

    Quote Originally Posted by MR TURBO View Post
    well by the sounds of it group a or not the accel jet removal does not seem to be right
    Getting somewhere

  27. #27
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Quote Originally Posted by JRP View Post
    Getting somewhere
    Your a funny one kinda unhelpful too maybe betting should stay your fortay instead

  28. #28
    Non-member JRP's Avatar
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    Re: Group A carb

    .... the Grouping drives me nuts

  29. #29
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Quote Originally Posted by JRP View Post
    .... the Grouping drives me nuts
    Well me and that car are going to have serious words come day break

  30. #30
    Non-member JRP's Avatar
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    Re: Group A carb

    Quote Originally Posted by MR TURBO View Post
    Your a funny one 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

  31. #31
    Non-member JRP's Avatar
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    Re: Group A carb

    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

  32. #32
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Quote Originally Posted by JRP View Post
    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

  33. #33
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Quote Originally Posted by JRP View Post
    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 Don't worry bro thats why there was a wink on the end

  34. #34
    Non-member JRP's Avatar
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    Re: Group A carb

    Never under estimate the power of the force....

  35. #35
    Non-member MR TURBO's Avatar
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    Re: Group A carb



  36. #36
    Non-member rs250nut's Avatar
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    Re: Group A carb

    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.

  37. #37
    Non-member Mart's Avatar
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    Re: Group A carb

    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! And don't forget the fibre/rubber seal either

  38. #38
    Non-member Mart's Avatar
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    Re: Group A carb

    Quote Originally Posted by rs250nut View Post
    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.

  39. #39
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Quote Originally Posted by Mart View Post
    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! And don't forget the fibre/rubber seal either
    Fibre/rubber seal does that come with the carb service kit??

  40. #40
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Fitted the accel jet back with rubber/fibre seal sounds ok still....Also had a little fiddle and sorted my accel pedal stiffness too still need to road test it tho

  41. #41
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    Re: Group A carb

    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...

  42. #42
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Quote Originally Posted by Big Jim Racing View Post
    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???

  43. #43
    Shifter of old Freezers djinuk's Avatar
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    Re: Group A carb

    Quote Originally Posted by MR TURBO View Post
    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.

  44. #44
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Quote Originally Posted by djinuk View Post
    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

  45. #45
    Non-member Mart's Avatar
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    Re: Group A carb

    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.

  46. #46
    Moderator, Committee Trevhib's Avatar
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    Re: Group A carb

    Quote Originally Posted by MR TURBO View Post
    Now this is what i'm talking about any more differences???
    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'.

  47. #47
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Quote Originally Posted by Trevhib View Post
    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

  48. #48
    Moderator, Committee Trevhib's Avatar
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    Re: Group A carb

    Quote Originally Posted by MR TURBO View Post
    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.....


    Quote Originally Posted by MR TURBO View Post
    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


    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!

  49. #49
    Non-member MR TURBO's Avatar
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    Re: Group A carb

    Quote Originally Posted by Trevhib View Post






    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

  50. #50
    Non-member Brigsy's Avatar
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    Re: Group A carb

    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...

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