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On the rollers
by Anders Dinsen ... June 25, 2009, 11:04:10 pm
The scheduled rolling road session in April didn't work out, and then I found out that the rear shocks were gone, so I had to postpone it until they came back from refurbishment, but yesterday the 24th of June, it finally happened: I had the car on the rolling road with F. T. Tuning in Svedala near Malmö: http://www.ft-tuning.se/

We spent about two hours mapping it, trying different jets, both in the idle (low speed) circuit, and the main circuit. It was too rich when we started, much better when we finished, but unfortunately we didn't have a small enough main jet to make it work perfectly, so this is only an intermediate result:

This cam should go far beyond 5000 rpm for max power, so the result of 130 hp on the top is not final at all. The max torque at 3300 is 198 Nm, and that is quite okay and 5% more than an S-cam is spec'ed at.

The jetting we have arrived at so far is

Mains: 140 (too large!)
Airs: 200
Emulsion tube: F9
Idle: 50F9

Ignition was advanced well beyond the 12 degree mark on the clutch housing.

Next step is to buy a set of new jets and do another session.


2 Comments | Write Comment
Re: On the rollers
by Anders Dinsen ... June 28, 2009, 08:43:29 pm
I think it's pretty much standard to set up the car on a rolling road if you're tuning the engine. Exception is for the few carburettor experts who prefer using ears and nose to do it, or if you're building a fuel injected system and fit a wide band lambda sensor in the exhaust.

On the rolling road you can run the engine at any revs under full load. In practice, he floored it at low revs and the let it slowly climb up to the max. The computers the measured the power out... Read More
Re: On the rollers
by Jon Weywadt ... June 28, 2009, 12:48:14 pm
Hi Anders.

That is a pretty serious tuning effort, but it appeals to my perfectionist side. Are you sure you are not a bit of one yourself?  Wink

Tell me how you arrange this, do you just call them up for an appointment, or do you have to "know" someone? Also, is it expensive? It sounds like you test it, change settings test again, etc. until you get it right. that could take all day, or Huh Huh

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