Is the C4 ZR-1 the Fastest ?

[MarkSS]

Fastest American production car of the 20th century would go to the ZR1s cousin... the 1991 Callaway B2K areobody was clocked at 192... Vipers of that era were 185. Fastest test time I was able to find for a stock ZR1 was 185. However... to be really accurate it would have to be same track same day... so who knows... the ZR1 is definitely in the conversation and has the distinction of averaging over 175 for 24 hours which no other car of the 20th century can say.

[edram454]

world record 1990 car with 3.08 or 2.73 gears went 195 on straight away in fort Stockton. 100% stock motor. This was to keep it at 5800 rpm for 24 hours.

I like the viper but not much of a fan of that truck v10 engine. I heard one at Aaron Scotts house that he recammed and that thing sounded like it should, radical. stock vipers sound like chriscrart motor boats.

ed ramos #3028

[spork2367]

Originally Posted by mike100

If you remove the qualifier 'American car', the Jag XJ220 and F40 come to mind as being the fastest production cars of that era.

Remove that qualifier and assume factory gearing and there are probably 30+ cars from the late 70's to 90's that best the ZR1 in top speed. Although admittedly most wouldn't keep up in acceleration at all.

Originally Posted by edram454

stock vipers sound like chriscrart motor boats.

I chuckled at that comparison.

[Paul Workman]

Originally Posted by spork2367

Remove that qualifier and assume factory gearing and there are probably 30+ cars from the late 70's to 90's that best the ZR1 in top speed. Although admittedly most wouldn't keep up in acceleration at all.



I chuckled at that comparison.

Remember too, the FIA (Stockton) ZR-1 also had the accelerator "blocked" to limit the throttle to the pre-determined setting necessary to break the record w/o over stressing the motor needlessly (ref: Heart of the BEast by Young)

[XfireZ51]

BTW, the motor used for the 24hrs. was a spare that set aside because it was deemed to have a slight vibration.

[Paul Workman]

Originally Posted by edram454

world record 1990 car with 3.08 or 2.73 gears went 195 on straight away in fort Stockton. 100% stock motor. This was to keep it at 5800 rpm for 24 hours.

I like the viper but not much of a fan of that truck v10 engine. I heard one at Aaron Scotts house that he recammed and that thing sounded like it should, radical. stock vipers sound like chriscrart motor boats.

ed ramos #3028

Yes! That or UPS delivery trucks...

[Enginerd101]

Originally Posted by edram454

world record 1990 car with 3.08 or 2.73 gears went 195 on straight away in fort Stockton. 100% stock motor. This was to keep it at 5800 rpm for 24 hours.

I like the viper but not much of a fan of that truck v10 engine. I heard one at Aaron Scotts house that he recammed and that thing sounded like it should, radical. stock vipers sound like chriscrart motor boats.

ed ramos #3028

The Viper V10 is a truck engine in the way that the LT5 is a SBC.

[KILLSHOTS]

Originally Posted by Enginerd101

The Viper V10 is a truck engine in the way that the LT5 is a SBC.

Yep. And to follow up on your point, in the late 80s, my father had a "Chris Craft motor boat" with twin factory 370HP 454s and virtually un-muffled through-hull exhaust. In my experience, they can sound completely amazing.

[ZRXMAX]

Based on roadside markers counted off a number of times in different places and timed with a stop watch my stock 91 Z with headers, a tune, forced air, and 3.07 gears barely exceeded 180mph in 5th gear. This was also at altitude between 5400 ft and 3000 ft.

[tccrab]

If anyone asks how fast, show 'em these pics:
Probably on a dyno, but heck, they look impressive as he11.