Gain extra benefits by becoming a Supporting Member Click here find out how!
Classic Performance Products Classic Parts
Ciadella InteriorsAmerican Auto Wire Classic Industries
Chevs of the 40sDanchuk Catalog
Hellwig Products IncPerformance Rod & CustomEcklers AutoMotive
Octane LightingNu-Relics Power Windows
Impala Bob's Bob's Chevy Trucks Bob's Chevelle Parts Bob's Classic Chevy

Username Post: Some interesting C4 performance figures        (Topic#343483)
tlake 
Member
Posts: 58
tlake
Age: 49
Loc: WA
Reg: 11-12-04
03-22-17 10:28 AM - Post#2682747    


I came across these UK magazine test times. I think they are interesting in terms of what a showroom car can do, given that Corvettes and other fast cars tested by Car and Driver, Road & Track etc. are often prepared, even though magazines request normal cars. I recall Car and Driver's 30,000 mile 1985 Corvette automatic report, where they discovered as they were just about to give the car back a bunch of GM repair orders stashed in the storage compartment showing that the car had been through a few transmissions, and had the odometer tampered with before C&D got the car.

In any case with the cars tested below they were obtained from the Belgium agent, so I would say there's less chance they were improved prior to testing. I have thrown in early and late C3s for comparison.

'82 TBI 350

1968 L68 427 4 speed 0-60 6.1 seconds top speed 145 mph (Motor)
1984 TBI Automatic 0-60 7 seconds top speed 139 mph (Motor)
1984 TBI Automatic 0-60 7.2 seconds top speed 138 mph (Fast Lane)
1984 TBI Automatic 0-60 6.6 seconds top speed 142 mph (Autocar)
1986 TPI Stick 0-60 6 seconds top speed 151 mph (Autocar)
1989 ZR-1 (380 hp) 0-60 5.6 seconds (Autocar)
1992 LT1 Automatic 0-60 5.8 seconds top speed 162 mph (Performance Car)

The LT1 car did a 14.1 second 1/4 mile at 100 mph.

Around the same time Autocar tested the 1986 Corvette, they also tested a BMW M635CSi (M6) and got 0-60 in 6 seconds and 150 mph top speed.

I have long thought the TPI cars to be great value for money, and recalling when the LT1 350 came out many thought it wasn't much slower than the ZR-1, so I have always had doubts over the ZR-1's power rating.




 




TAT_2 
"16th Year" Silver Supporting Member, and Official CT Grim Reaper
Posts: 34663
TAT_2
Loc: "UNDER THE BOARDWALK"
Reg: 10-29-00
03-22-17 02:37 PM - Post#2682791    
    In response to tlake



09 PONTIAC- VIBE
08 PONTIAC- G6
96 FURD SUPER CAB XLT 4X4
93 VETTE - 40TH ANIV RUBY RED LT1/6SPD/RAG TOP
NEXT ?


********
PREVIOUS VETTE'S 58,68,70,76,78,85,90
********


Blessed are the cross-eyed, for they will see God twice


 
tlake 
Member
Posts: 58
tlake
Age: 49
Loc: WA
Reg: 11-12-04
03-23-17 05:44 AM - Post#2682895    
    In response to TAT_2


Correction: LT1 time was 14.3 seconds in wintery conditions.



 
1983G20Van 
Super Senior Member
Posts: 3620

Loc: Bedford, Texas, USA
Reg: 11-13-02
05-03-17 07:50 PM - Post#2689515    
    In response to tlake

Seems like that LT5 needed a driver mod to me or perhaps good air and a well prep'd track. I have seen them run 12.5 bone stock at around 112 mph. The DOHC likes to rev and the higher you rev it the better it performs. Then again I have also seen a bone stock LB9 G92 5-spd 1991 Camaro run a 13.7 at about 100 mph. Come to think of it we were all HAULING butt that night. I ran 13.9s in a Nissan Titan. I cut a 1.99s 60' with an open differential in a 5,300 lbs truck.

My daily driver is an Infiniti M56S rated at 420 HP but makes made more like 450 HP STOCK. It ran a 12.9 @ 110 bone stock. It put down about 25-30 HP more than the LT5 I have seen dyno'd stock but is wrapped in a 4,200 lbs Sedan. No doubt with a competent driver the LT5 is an easy mid 12 second car. That 5.8 0-60 was probably run with ALOT of tire spin.

I have seen many videos of the LT5 ZR1 C4 running away from the LS6 ZR1 C5 with the same power rating on the highway. The further the race the farther the LT5 pulls ahead.

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 05-03-17 07:57 PM. Reason for edit: No reason given.

 
1983G20Van 
Super Senior Member
Posts: 3620

Loc: Bedford, Texas, USA
Reg: 11-13-02
05-03-17 08:05 PM - Post#2689516    
    In response to 1983G20Van

Here is further information to support my observation. Corrected to 60°F it ran High 12s on a 70°F day Get it on a 40-50°F day and watch what happens.

http://www.corvetteactioncenter.com/specs/c4/zr1/z...

1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


Edited by 1983G20Van on 05-03-17 08:08 PM. Reason for edit: No reason given.

 
tlake 
Member
Posts: 58
tlake
Age: 49
Loc: WA
Reg: 11-12-04
05-05-17 10:11 AM - Post#2689701    
    In response to 1983G20Van

  • 1983G20Van Said:
Here is further information to support my observation. Corrected to 60°F it ran High 12s on a 70°F day Get it on a 40-50°F day and watch what happens.

http://www.corvetteactioncenter.com/specs/c4/zr1/z...



I have no doubt what you are saying is true. Real life and magazine testing are two different things. My interest was in comparing magazine tests to see the relative performance between versions, given they are generally carried out in the same way.

When Road & Track first got hold of the LS1 powered C5 they were recording 0-60 mph times in the low 5 second bracket. This seems to sit well with the ZR-1's mid 5 second time, in the scheme of general tech progress.

With the ZR-1 in mind, trying to isolate the benefits a DOHC 4 valve engine brings, MotorWeek's comparison of a 1984 BMW 318i and 1990 BMW 318iS is interesting. Both a/c, stick shift cars with the same body, but the latter had a DOHC 4 valve 1.8 liter, the older car a plain SOHC 2 valve 1.8 liter and 30 less hp. 1/4 mile times were 17.5 vs 17.3, favoring the younger car. A very small gain given the extra tech.




 
TAT_2 
"16th Year" Silver Supporting Member, and Official CT Grim Reaper
Posts: 34663
TAT_2
Loc: "UNDER THE BOARDWALK"
Reg: 10-29-00
05-06-17 04:41 AM - Post#2689808    
    In response to tlake

IMPRESSIVE LOOKING MOTOR.NEVER DROVE 1 ALTHO A FEW WERE AVAILABLE. BOWTIE OLLIE HAS A 90,I THINK HE STILL OWNES IT ALONG WITH A 86 PACE CAR BACK UP.

09 PONTIAC- VIBE
08 PONTIAC- G6
96 FURD SUPER CAB XLT 4X4
93 VETTE - 40TH ANIV RUBY RED LT1/6SPD/RAG TOP
NEXT ?


********
PREVIOUS VETTE'S 58,68,70,76,78,85,90
********


Blessed are the cross-eyed, for they will see God twice


 




Icon Legend Permissions Topic Options
Report Post

Quote Post

Quick Reply

Print Topic

Email Topic

1574 Views
FusionBB
FusionBB™ Version 2.1
©2003-2006 InteractivePHP, Inc.
Execution time: 0.587 seconds.   Total Queries: 17   Zlib Compression is on.
All times are (GMT -0800) Pacific. Current time is 07:32 AM
Top