— Ducati 4V Desmoquattro Non Linear TPS Baseline Adjustment…

21 Мар 2015 | Author: | Комментарии к записи — Ducati 4V Desmoquattro Non Linear TPS Baseline Adjustment… отключены
Ducati ST3 S ABS

4V Desmoquattro Non Linear TPS Baseline (plus ST3) — 06/08

Summary: How to set up 4V throttle with the Non Linear TPS.

of idle mixture setting for ECUS: P7 and P8, 1.6M and 5.9M.

for ’04 and ’05 model

Extra photos that I have provided by Jan Krohn, “Jasper” Bower, “Duc Troy and Mike Currie the 851/888 Yahoo list.

TPS across all 4V models

Non Linear: 851, 888, 916, S4, 996, S4R (Desmoquattro), ST4S.

749, 848, 999, S4R 1098. Unlike the 2V models have a bolt on Linear most of the 4V models have it (peened over, etc) the throttle bodies themselves, and are not as such.

Two different sets of bodies have been on the Desmoquattro 4V engine bikes the release of the 851 in ’88. Both been available in either or dual injector configuration.

All 851 and 851/888 SP models up to the release of the 888 in used the first style. The below show the features of throttle bodies.

In the photos notice I’ve numbered all the we need to know about in across all the photos. That if I give a number, you know part I mean. Some are denoted by letters — are used so as to not confuse the TPS setting which is laid out for both of throttle bodies.

Items from the LH side.

1. TPS

2. TPS adjustment

3. Injectors — “green end IW031

A. Manifold vacuum off tubes for fuel pressure

B. Unused casting mounts for injector

C. Fuel pressure

The TPS (1) is the usual Non Linear part on all 4V Desmoquattro engines, although the 851 models have red bodies As far as I know, they are functionally to the black bodied part You can also see, in the above that the TPS connector is at the top of the TPS (1). is how all the P7 ECU TPS are fitted, for some reason. ones have the connector at the

The flat section on the throttle the TPS (1) locates on defines the orientation.

The pressure regulator (C) between the bodies has a tube from it into a T piece and then to of the throttle bodies under the for manifold vacuum (A). The manifold vacuum is fed to the fuel regulator is to keep the pressure across the injectors constant. means at idle the fuel may be 2.5 bar instead of the nominal 3 bar as the manifold is 14” of mercury, being the of 0.5 bar in vacuum terms.

In real terms it doesn’t that much difference tried it on later models) and it was from all bikes running the / Magnetti Marelli systems the introduction of the P8 ECU onwards (888 # 501 or so, All the later fuel pressure still have the little for it, as I believe most car systems use this feature, but it’s not to be hooked up to anything.

The fuel regulator on some or all of these bodies is also adjustable via a hex screw under a plastic cap in the end of the regulator. The photo above, by Jan Krohn, shows how to access the The hole the hex T-handle is going is not std.

You have to drill that

Items viewed from the RH

Throttle cab le wheel

Ducati ST3 S ABS
Ducati ST3 S ABS

Throttle mount

Throttle linkage rod

cylinder idle stop

Vertical cylinder id le stop

This photo was supplied by Currie on the 851 Yahoo list. You can see the old red TPS (1) these throttle bodies And, as you can see, no air bleeds. The linkage rod on these is adjusted the nuts at either end (one end is LH and rotating the rod and then tightening the

It’s as annoying as it sounds, and can be frustrating when it just want to work, trying to get hands up under the fuel etc.

The second style throttle have been used on all from 888 onward, finishing in with the last of the Desmoquattro S4R Monsters. These also in single or dual injector and feature injectors that fit the throttle bodies, with the connector protruding. 888, S4, ST3, ST4 and ST4S models a fast idle mechanism. S4 and S4R models have a fuel regulator mounted on the cross

All other models have the in the fuel pump plate in the bottom of the fuel tank.

The or synchronisation adjustment mechanism from two different types of throttle wheel screw on 888 and the large white nut on 916 and later

In the following photos you’ll I’ve numbered all the parts in the series as the 851 throttle body above. That way, if I a number, you know which I mean.

Items viewed from the LH

TPS — throttle position

TPS adjustment screws

Injector side flow” IW724

Ducati ST3 S ABS
Ducati ST3 S ABS
Ducati ST3 S ABS


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