Jump to content


Photo

Su Idle And Tuning Problems


  • Please log in to reply
6 replies to this topic

#1 scott

scott

    Advanced Member

  • Members
  • PipPipPip
  • 199 posts
  • Location:Qld

Posted 14 October 2015 - 08:38 PM

Hey guys. Got some Su idle problems. As u can hear the front one picks revs up and sounds cleaner when sync is held up to it but rear dies down and as u can see kills it.

Also if i attempt to rev it, it just dies instantly.

 

72 3 screw su's (i think its correct)

2.5 turns out on mixture

Atf oil in Su's

idle's around 800 rpm

 

Things i havent checked is fuel float bowl level

 

vid here 

 



#2 neRok

neRok

    Advanced Member

  • Members
  • PipPipPip
  • 230 posts
  • Location:Perth NOR

Posted 15 October 2015 - 09:48 AM

2.5 turns is not a tune, it's a ballpark starting point. I found this video a good help:


  • scott likes this

#3 1600dave

1600dave

    Senior Member

  • Members
  • PipPipPipPipPip
  • 607 posts
  • Location:Newcastle,NSW

Posted 15 October 2015 - 10:54 AM

 

 

Things i havent checked is fuel float bowl level

 

 

Check this before you go any further - it is important in SU's



#4 scott

scott

    Advanced Member

  • Members
  • PipPipPip
  • 199 posts
  • Location:Qld

Posted 15 October 2015 - 08:32 PM

front 

20151015_163018_resized_zpsxskgpvw7.jpg

rear

20151015_163602_resized_zpsaoxbyzen.jpg

20151015_170947_resized_zpsjer4vseq.jpg



#5 scott

scott

    Advanced Member

  • Members
  • PipPipPip
  • 199 posts
  • Location:Qld

Posted 15 October 2015 - 08:58 PM

also should this have tension so it doesn't open and close so easly? The front had has tension and the rear doesn't 


Edited by scott, 15 October 2015 - 08:58 PM.


#6 Clockwork

Clockwork

    Advanced Member

  • Members
  • PipPipPip
  • 63 posts
  • Location:Hobart, TAS
  • Tagline:Joel

Posted 16 October 2015 - 01:09 PM

It looks like u may be having similar issues to me. If the car is dieing when you put the unisyn on the rear carb, then it is too rich (less air flow more fuel, flooding). Looking at your float levels, the rear is quite a bit higher than the front, also indicating flooding (fuel sitting in the jet too high). Try unscrewing the rear richness a bit.

That last clip of the float thingy (very correct term...) could be the issue too though.

From what I understand, fuel pump should regulate to give consistency between carbs, so one shouldn't get more fuel than the other, but if the pump is putting too much PSI through then it CAN just affect one carb (I'm not sure if a blockage can do the same thing? Maybe blocking off the front forcing more fuel to the rear?)

#7 scott

scott

    Advanced Member

  • Members
  • PipPipPip
  • 199 posts
  • Location:Qld

Posted 17 October 2015 - 07:36 PM

Turns out i was a tooth out on my oil drive to dizzy. runs perfect now :)


  • gav240z likes this




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users