Weber Carburettor Tuning

Own a DCOE, IDF or IDA Weber? Speak to us about tuning.

RPW stocks the complete range of jets to tune the DCOE and IDF range of Webers. This includes all idle, main and air bleed jets. We also stock the standard range of emulsion tubes and accelerator pump jets. For those using the IDF model carburettors, these use a hybrid of DCOE and DGV jets, and as such, we can sometimes run into issues with jetting. The main variations are the idle and accelerator pump jets.

We do stock a small range of DGV / DFV Weber jets but usually order these in as necessary once some baseline is sorted out.

The most popular setup is usually twin or triple 40 or 45 DCOE Weber, depending upon being a four or six cylinder engine.

We have tuned many vehicles from Historic MGB’s, Alfa Romeo, Nissan 240Z and 260Z, to Ex Formula one vehicles with the renowned Ford BDA engines. We are one of the few firms in Perth who have any actual experience in tuning these carburettors.

We treat each vehicle as a one on one situations and work closely with the owner, in many cases tune the vehicle with the customer at the same time. Our goal is to produce the safest and best tune available to suit the desired use of the vehicle, be it street or race.

We have recently upgraded our service to now include the Dellorto range of carburettors. They produce same results as the more commen DCOE Weber, but generally are harder to source a constant supply of jetting.

RPW when tuning, goes through the following order to ensure that we are able to tune your vehicle to its maximum capability

  • The vehicle is fitted to the dyno with all appropriate sensors including knock sensor, and if possible, depending upon current state of tune, a baseline power run is performed
  • The idle and main jets are removed and recorded for baseline data
  • Ignition timing is also checked for baseline reading at both idle and checked with free revving to record maximum timing being provided
  • Carburettors are then checked for balance and adjusted if necessary.
  • The vehicle is run up on the dyno again and checked at light and medium throttle to ascertain balance of existing tune
  • Idle circuits are adjusted to provide correct idle mixtures (Usually around 14.0 : 1).
  • Idle air bleeds are adjusted to fine tune air fuel ratios at light throttle (Usually around 14 – 15 : 1)
  • From here multiple power runs are performed with adjusting of main jets / air bleeds and if necessary emulsion tubes to provide best balance of mid to heavy throttle loads and wide open power runs. Our aim is to produce a flat 12.8 – 13.2 : 1 air fuel ratio where possible. This is achieved by changing one item at a time, and recording each change for accurate results
  • Once the desired air/fuel ratio curve has been obtained, ignition timing is adjusted to produce maximum power and torque figures.
  • Vehicle is then test drive on the road to check functioning of accelerator pumps and adjust if necessary to avoid flat spots.

Final note – all power runs are done with bonnets closed and air cleaners fitted to simulate racing situations as much as possible.

Prices for tuning vary but are usually as follows

  • Workshop labour rates ($100.00 per hour) for all work done during tuning
  • Dyno charge rate of minimum $100.00 to maximum of $180.00 depending upon time spent running on dyno.
  • All new jets are charged out to customer at retail pricing.
  • Jets removed can either be credited for 50% of retail value or retained by customer.

Final note- we do not recondition or overhaul Weber carburettors. It is assumed that prior to bringing the vehicle in for tuning, that it is in good mechanical condition and that the Weber carburettors are also in good condition.

Webber DCOE 40
Racing Performance Works Dyno Tuning Specialist
5.0L DOHC "Cammer" V8 Crate Engine
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