I find fully-tuned
FC RX-7's, race-modded if allowed, about the right balance of manageability and challenge for the enduroes and
Hard-Tuned Series. Another pleasant but not too overpowering car is the
Nissan 180SX'94. I'm not sure I ever tried a race-mod version.
I realized I have a summary
GT1 Enduro log here...
http://www.geocities.com/gt2toxs/gt/logs/gt1enduro.txt
I think the following was one of my proudest
GT1 accomplishments:
Game: main
Day: 5413
Date: October 28, 2000
Race: Grand Valley 300KM Endurance Race
Car: tuned green Cerbera (S/S, no race-mod)
Qualified: 6th(+2.053) 1:46.833not
Result: 1st
Money: Cr300,000
Prize-Car: black/green Castrol Supra GT
1st:* Cerbera 1-40:46.0<--
2nd: [R]NSX-R LM GT2 +81.643 (1-42:07.6)
3rd: [R]GTO twinturbo +90.042 (1-42:16.0)
4th: [R]CASTROL Supra GT +90.381 (1-42:16.4)
5th: [R]R32GT-R'91 +98.923 (1-42:24.9)
6th: [R]Impreza Rally Ed +166.316 (1-43:32.3) 1 lap
Pits: 15,30,45
fl(3): 1:36.888
And, hey, that was officially in my "first game". (Code name "main").