Where has my boost gone?

The car has stopped producing huge amounts of boost. It boosts smoothly to the broken yellow/red section of the gauge and that’s it. All hoses have been checked and were fine. The car had no problems on Wednesday when I last drove it hard. What could have gone wrong this time ? *sigh*

Crankcase breather one-way valve

I now know the function of the one-way valve that was replaced yesterday, so shall share the information here. Nasty gasses build up in the crankcase. Instead of venting to the atmosphere these are fed into the inlet manifold where they can be burnt. I guess this is more environmentally friendly. In a normally aspirated … Read more

New DI Cassette

I have just returned from WMSS and my car sports a shiny new DI cassette. Upon arrival a number of tests were performed on various bits of the vacuum system. The one-way walve on the crankcase breather hose was found to be faulty. Apparently this is bad although and they explained why but I am … Read more

More Dyno Analysis

Having spoken to one of the guys who tested my car I have more information to add. It seems that analysing these plots is more complex than I had thought. 1) The Dyno The performance figures were definitely measured at the wheels – they didn’t do a deceleration run. Their rolling road is one of … Read more

Fixing problem

The car is now booked in at WMSS towards the end of January. Hopefully they will be able to diagnose the problem and fix it. I have recieved a suggestion of removing the DI casette, stretching the springs and giving it a clean before reassembling with some silicon grease around the boots and springs. Might … Read more

Dyno analysis

Following debate on Saabscene, it seems likely that my car isn’t producing as much power as I thought it was. The thread here contains more info. It looks like the dyno figures may well have been adjusted to flywheel rather than being wheel measurements. This matches my peak torque at 1.4 bar boost to similar … Read more

Rolling Road Results

The Aero had its first outing on a rolling road yesterday. It performed well, although apparently there is a misfire at the top-end of the rev range. I don’t really want to splash out on a new DI cassette now so that may wait a few months. It was recommended that I try the BCR8 … Read more

Rolling Road

The car is now booked for a rolling road session next week. This should let me know the power, torque, boost and air-fuel ratio throughout the rev-range. This will all be done at Chip Tuning, in Bromsgrove, www.dyno-tuning.com. Results will be posted next week.

Headlamp problems

Whilst driving home last night I found my headlamps didn’t work properly. The driving lights (which are always on) were fine, and these are close to dipped-beam brightness so it is possible to drive on them. The next switch setting is sidelights, and this worked fine. The final setting is dipped-beam and this didn’t work … Read more