Koenig Specials Testarossa Values

would b good if you could fill out your profile so we know where are you from and what is your technical experience

a car with modified engine never will get a classiche certification

 

hello kelly,
thank you for updating your profile.

koenig did several steps of modification for the TR-family. please have a look here:
https://www.koenig-specials.com/ferrari/Ferrari neu.htm

the main idea from koenig at that time has been great. but the processing of those ideas always done in a hurry. he commissioned to many other garages/mechanics ( I know meanwhile some ) with his ideas and set them under time pressure. but also hired own technicians, payed them very well. but there has been always the time pressure to finish a car. no one was the same as the one built before. and not all has been documented. unfortunately willi koenig died and short time later also walter keonig and now only his second son, oliver, is doing some business with koenig specials, but not produicing anymore, only selling what there is still in stock. also not developing anymore. and it is very hard to get some info about cars they modified.
the engine modification has been done ( so turbocharger ) also by several different companies, by koenig itself or in the near of him and nearby workshops and also form albrecht in austria, also working with novitech. but all 3 are totally different.

I remember the time about 1985 to 1990 when I have been at several ferrari meetings at race tracks. mostly willi koenig has been there with his son walter with there 365 BB race car and with at TR with 2 turbo chargers. this car has always been the fastest on the track on a straight. it seems the other have been parking. but the first corner the others have been near him, sometimes thay passed him. but koenig both cars he bring in a truck, not driving to the event on own axle.

if such a KS car is done right later by the owner ( weakest part is the gearbox, clutch, the electric wires for the upgrade - no documentation ), then of course as all original TR´s have the fusebox, the AC then it will be a reliable car. but until then the owner has to spend much money for the stronger parts and may be also for the labor if he can not do by himself.

I think if once such a KS car is done as it has to be then it should be much more worth than a normal TR with a lot of miles. I would say a good and well done KS car is worth the same as a very low mileage TR. even it is put much more money in. but also if such a KS car is done right and one would like to have a reliable KS car ( the original never have been reliable ) and all is documented right it is a question of how much the buyer would like to pay and also for how much the seller would like to sale.
for example: I would not sell my competition as it is just now ( still working on the mapping for the ignition and injection ) below 280.000 €. included a complete overhauled gearbox with all the expensive stronger parts, a 3rd gearbox dismanteled but also with the stronger parts and a second to rebuilt engine.

hope this will help you a little?

if original I agree, but if done all then the value is much higher

 

exactly, that is it
the only one koenig made with narrow body and max horsepower/torque
it was once koenigs test car

 

the wider body had also wider intercoolers left and right

 

I go until now up to 1,3 bar and have no problem with too warm air. never tested a wide body with so much boost so can not compare. but I think with larger intercoolers you may need a little less boost for the same power.