ST4 — Sigma Performance Ducati

21 Мар 2015 | Author: | Комментарии к записи ST4 — Sigma Performance Ducati отключены
Ducati ST4 S

Ducati ST4 — The Gentleman’s

This has been a good I have just been out for a on my rejuvenated ST4. Its my road its not a race bike, but the one I choose for business on the normal streets. It a bit frumpy, but there are few bikes on the that can match its sheer when hustling through the on public roads and fewer that can earn that while carrying a passenger and

I ride very much by if everything feels good I go if something isn’t right I stay slow. The first I went out in the wet on this thing it felt great; I was catching and past absolutely everyone. It is one of the balanced and effective bikes I ever had the pleasure of riding.

Any one who saw me try to race in the wet will understand how generous a compliment this is.

My ST4 got ‘Stanley'; it just suited his Stanley is a Gentlemans express, to ride, very comfortable and very quick. The first miles have been a bit Stan got run in while I was escorting my girlfriend around as she learnt to on a 400cc Honda, we then across northern Spain, Bilbao to Barcelona and back, as escort for the Honda. Don’t get me this was all very enjoyable it is that Stanley got a long run in…………

Riding in the low throttle and low rev zones I was in a different way to the race settings I become used to trying to As a result I have tried to some of the normal street I care about the handling panniers fitted, I care the low RPM response, and the midrange. Stanley bad but he wasn’t perfect when such a long and thoughtful

Several points really got to me the beginning, there was a definite low rpm down at 2500 rpm, not an of the rev band where I had ever that I would worry but once noticed it was quite Initially I thought it was merely a thing, we tried a 14-tooth Very nice for acceleration but no change in the snatchy feeling.

I would also occasionally a slight front tend going into corners.

the trip to Spain I decided to get about sorting out the niggles. I a richer chip, just low and there was a real improvement. In I decided to do the first half of the into this report and to the dyno. All these first were with standard but two things came out of the day that to point the development of this in one particular direction, the ‘open Ultimap’ for this bike very well even the standard pipes.

The second was that we had another restrictive design.

I decided that we run the bike for a few more miles it had around 6000 miles on it and do a Full Monty to make everything was alright. At the same I got a second airbox top so I could saw up the one with impunity.

Today (Mid July we finished off the bike (you note that it has taken a few to get this together but it took a in the workshop before I could get my own in!). I have just got from my first real and the improvement is brilliant, it really me that it was smooth, seriously mid range pickup, and with the work we had done to the fuel system no snatchiness down In a real return to thinking road handling the bike has had a few to the chassis set up and most important of all a new rear tyre.

For a bike this the dyno is almost its just that I cannot fiddling to get the last bit of performance out of a be it mid range stomp or peak for a racer. The return to the dyno was a treat though. We had noted the heads were off that the open pipe Eprom standard pipes was causing it to run a bit carbon deposits had been up in the exhaust ports and had to be cleaned out and the was starting to loosen.

We re-shimmed the heads and reset the to allow us to use the later thin head gaskets (better control due to more sophisticated circulation). On the rocker front was OK but Stan has always, always from a 90 second warm up moving off. After the were cleaned and lapped to the the cams were re-timed to settings and new belts fitted. The injection system was balanced and set up.

In one of our Full Monty services. fitting the new rear tyre we set off for the

First run last November, about 3000 miles on the was with a standard Chip, standard pipes and air intake About 104 hp, not bad really for a standard 916 By the time we had finished we had 110 bhp and up to 8 more the midrange; all the dips and troughs in the have gone and I love the

Leo Vinci oval aluminium were fitted as a comparison to the heavier standard pipes.

The confirmation was that the Ducati department still suffers ‘Supermono airbox disease We took the airbox top off and promptly a bunch of power, all the dips and in the curve ironed out. likewise was up, at 6000 rpm we had a near 7 improvement; 14% more than

We don’t like impractical and leaving the top right off was going to a bit too much noise and would the filter open to getting this is a street bike all. We decided to try and modify the system for the best balance of and power.

Taking the airbox snorkels out upped the noise but no difference to the power. Two extra holes in the back of the top got us a couple of HP at the but we were after the mid range, stripping out the back of the airbox top got us everything we wanted.

5 bhp came from just mod all the way from 4500 to 9000, a of hp for the last bit, the only to the completely open box being 2 to 3 hp 8000 to the redline, we got all the torque up to 9000 too. If we have an ST4 I’ll worry about the bit.

Ducati ST4 S
Ducati ST4 S

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