Section : Carburettors

SU carb tuning

Posted By : Paul Jenkins, 28-May-2003, 04:37pm

Hi Everyone,

Does anyone know of a good website for SU tuning. I just can't seem to get the fast idle set correctly, and the slow idle seems very eratic (i.e. some times its 800rpm, other times it's 1100rpm!!!).

Many thanks.

Paul.

Followups :

SU carb tuning

Posted By : Nigel Gibbins, 28-May-2003, 04:51pm

Try this one:

http://www.vtr.org/maintain/carbs.html

Quite clearly explained...
NiG
http://www.niginthecar.net
- SU carb tuning
  
  Posted By : Daniel James, 29-May-2003, 11:02am
  
  Correct me if I'm wrong but...
  
  You can expect some difference in idle depending on what electrical items you have on, temperature of the engine etc...
  
  I have set my idel to be 900rpm when warm with the stereo on, and if it's raining with heater/lights wipers on it'll go down to 650ish, and it can go above 1000 (if the car is cold) I'm *hoping* this is normal...
  - SU carb tuning
    
    Posted By : Nigel Gibbins, 29-May-2003, 12:04pm
    
    I an ideal world the revs wouldn't fluctuate that much. But as long as the battery is still getting it's charge I can't see why you should meddle too much.
    
    If you aren't getting a proper charge at 650rpm (with all that gear on) then you may want to consider an alternator upgrade/change. Or as an atlernative you could fit a smaller front pulley to the alternator so it spins quicker.
    
    NiG
    http://www.niginthecar.net
    - SU carb tuning
      
      Posted By : Daniel James, 30-May-2003, 08:24am
      
      oh... hmm... well I don't think I'll worry, I've never had any problems with the battery going flat or anything, there's more important things to worry about first!