Kristoffer Karlssons Volvo 142
Genboard setup page: MembersPage/MattiasSandgren/VolvoBtwenty/Genboard
The engine in this car is based on a Volvo B20A but has been upgraded and rebuilt.
- Custom crank trigger with Honeywell GT1 Hall sensor
- Stock single coil and distributor ignition system
- Sequential fuel injection with no cam sensor and high-Z 300 cc/min injectors
- Custom intake manifold adapted from Volvo B20E/F engine
- Camshaft has 105° lobe separation, 312° duration and 12.54 valve lift
Approximate crank power is 170-180 hp, compared to the stock 85 hp.
The intake manifold has been ported out and the throttle replaced by a flange for a removeable 65 mm BMW throttlebody. Note that there is no throttle linkage in the pictures, it was fixed later. Fittings for a fuel rail and regular Bosch injectors has been welded to the runners. The runners have been ported out and smoothed. Here are some pictures of the manifold as it is mounted.
Here are two pictures of the custom trigger wheel we made for this and a few other VEMS installs on this type of engine, it's simply a disc welded on to the stock wheel that drives the generator.
Update 2005-10-07
This car has been started up with VEMS as of today, ignition only. Trigger is through a Honeywell GT1 at the crank with a custom trigger disc. Spark is through the stock distributor, the car is already running much better due to not having to rely on worn points in the distributor.
Fuel is for next weekend, everything but the fuel plumbing is done. Stay tuned.
Update 2005-10-15
Today the carburator was removed and the fuel injection manifold was mounted to the head. Started right up after increasing cranking pulsewidth and thereafter req_fuel to get it idleing.
You can download a short movie from the moment we got it to idle well, right [here] (15.4 MB).
Update 2006-05-24
Firmware 1.0.36 was installed and we remapped the engine. This coming weekend the old engine is coming out and within a week we hope to have the newly rebuilt engine in place.
Update 2006-12-09
Firmware 1.0.53 was installed with hopes that we could tune the engine with Alpha-N but stumbled upon a problem right away. There could be a quick and short answer if I simply describe the so I will post the config and tables later, if it turns out to be more complex.
Basically we ran out of VE values. With a req_fuel value of 25.5 ms (the most you can have) we maxed out the VE table values at low and idle load at 255%. With Speed-Density we had 25% VE with a req fuel of 14 ms at idle.
Tomorrown we will try to set the TPS reading so that 5% is closed throttle, because we believe the pulsewidth calculation doesn't work when TPS reads 0%.
The injectors are wired to fire sequentially, but we have no cam sync - it is only a simple trigger setup. We can just run it with Speed-Density as it was tuned previously, but due to the cam shaft profile there is very little vacuum so we would really like to use Alpha-N instead to get better quality.
One thing on the wishlist:
- Ignition table based upon MAP and rpm