Revision Corvette ZR-1 model year 1990 #125

[Ccmano]

Originally Posted by Thomas ZR-1

After the test drive it was time for the official technical check at the German T?V. The ZR-1 passed the required tests including the special check for getting registered as a classic vehicle in Germany.

Based on the porting of the injector housings and the plenum the engine seemed to be really powerful. So I checked the engine power on a car dyno in Cologne with 406.5 PS (401 HP) as result. This was over 25 PS (24.7 HP) more than stock. It?s justified on the better air flow into the engine by the ported intake.

All I can say is WOW! 🤩 Your level of detail work is amazing. I'm curious, did you upgrade your "tune" on the EPROM chip or are your running stock? If you did upgrade the chip, who did the tune? If your running a stock chip there are a few more hp (~10-15) available given your top end porting.
H

[Thomas ZR-1]

Yes Hans it`s not a stock EPROM. I installed a chip from Marc Haibeck for the standard engines: AYBKG5 calibration. The more HP are probably a result of the top end porting with the not reduced flow diameter in the first muffler (70mm from end to end).

[Thomas ZR-1]

Hi Marty you are right...there might be many reports such as mine but are these really so detailed and extensive...? Can`t remember such a report in the last years so in fact: I?m not sure.

Does it make sense to restore a ZR-1 in Germany in that way: the answer is: YES! If you purchase a Z in the US and bring it to Germany you have to count: car`s price + shipping costs + 10% toll + 19% taxes + the costs (hardware and checks). That`s the reason why prices for used (and rare) ZR-1s in Germany are double compared to the US.

[Thomas ZR-1]

BTW Charlie you should hurry up with visiting Germany for driving on the Autobahn. The f**king green party in Germany grows up more and more and all the "Greta Tumbergs" wants to have a permanent 130 km/h (80 mls/h) Autobahn speed limit...40 hp would be enough per car...?!?

[Thomas ZR-1]

Ok guys here are some pics before and after the restoration but first: the one and only picture from the Z when it came from the factory / dealer. It was taken from the previous owner Dennis Richard Lape, Itasca, LA.

At the beginnig of the restoration I was in contact with him. I sent pics from what I was doing with his former Z but after 3 month his email answers stopped. I didn`t here anything more from him but he really seemed to be very interested in what I dwas doing with the car.

Dennis was a member of this forum until 2016 or 2017. I hope he is ok in this Covid19 time...maybe some of you could know him.

[Thomas ZR-1]

Body before:

[Thomas ZR-1]

Body after:

[Thomas ZR-1]

Engine before:

[Thomas ZR-1]

Engine after:

[Thomas ZR-1]

Exhaust system before: