Performance Test Report - Critical Performance Data

[BBB]

I came across Road and Track's offical performance review on the GT and thought I'd share the performance report. It's a nice break down on all the critical performance data.

 

[NobleCrow]

thats pretty cool.

 

[eflyguy]

Dyno chart is a bit awful, tho! lol..

 

[Paul32]

I came across Road and Track's offical performance review on the GT and thought I'd share the performance report. It's a nice break down on all the critical performance data.
View attachment 10557

Did anyone notice that top speed was obtained in 6th gear. Looks like there is not enough power to pull greater speeds from 7th and 8th unless they are governed.

 

[Kamauxx]

Did anyone notice that top speed was obtained in 6th gear. Looks like there is not enough power to pull greater speeds from 7th and 8th unless they are governed.

7th and 8th are probably overdrive.

 

[Grayt 8]

Did anyone notice that top speed was obtained in 6th gear. Looks like there is not enough power to pull greater speeds from 7th and 8th unless they are governed.

Road and Track is guessing that is what will happen. I wonder if anyone has tried.

 

[Paul32]

7th and 8th are probably overdrive.

All three are overdrive ratios.

 

[Grishbok]

It always makes me go 'hmmm' when I see a dyno with the exact hp and tq numbers as manufacturer has advertised. Usually there is at least a little deviation in one or the other. I suspect the engine is capable of greater performance, but the ecu is programmed such that it specifically adjusts to produce those numbers. That is probably the case with this engine.

 

[Kamauxx]

I think that's because most of the information on that data sheet was taken directly from Kia and written up on a pretty little all-in-one sheet with R&Ts name on it.

 

[Grishbok]

I think that's because most of the information on that data sheet was taken directly from Kia and written up on a pretty little all-in-one sheet with R&Ts name on it.

I thought about that too but wanted to give them the benefit of the doubt, lol.

 

[eflyguy]

The very definition of "overdrive" is gears that will not allow a vehicle to reach top speed. They're there to allow cruising at lower RPM.

 

[Paul32]

The very definition of "overdrive" is gears that will not allow a vehicle to reach top speed. They're there to allow cruising at lower RPM.

I'll agree with the last part of your statement but back in the 50's, 60's overdrive meant a gear ratio that was higher than 1 to 1. Had nothing to due with top speed. 5th gear is 1 to 1 in the Stinger and 6,7,8 is higher than 1 to 1. I believe it's no longer called overdrive because with all the gears in the current trans, there's more that 1 gear higher than 1 to 1.

 

[eflyguy]

True that - I had a killer headache and didn't feel like expanding my post and say that it's originally from when the drive shaft was being driven faster than engine RPM - "an automotive transmission gear that transmits to the drive shaft a speed greater than engine speed"..

With the early development of cars and the almost universal rear-wheel drive layout, the final drive (i.e. rear axle) ratio for fast cars was chosen to give the ratio for maximum speed. The gearbox was designed so that, for efficiency, the fastest ratio would be a "direct-drive" or "straight-through" 1:1 ratio, avoiding frictional losses in the gears. Achieving an overdriven ratio for cruising thus required a gearbox ratio even higher than this, i.e. the gearbox output shaft rotating faster than the engine. The propeller shaft linking gearbox and rear axle is thus overdriven, and a transmission capable of doing this became termed an "overdrive" transmission.

wiki referencing Setright, L. J. K. (1976). "Overdrive". In Ian Ward. Anatomy of the Motor Car. Orbis. pp. 93–95. ISBN 0 85613 230 6.

 

[NobleCrow]

I had a 1967 Volvo 122S 4 Speed that had overdrive. It made all the difference.

 

[Paul32]

I had a 1967 Volvo 122S 4 Speed that had overdrive. It made all the difference.

I don't understand your comment, all the difference? In what?

 

[NobleCrow]

I don't understand your comment, all the difference? In what?

Sorry..It was a bit off topic. The overdrive on my old car made all the difference in speed. In 4th gear, you couldn't get to 60 MPH without the engine sounding like it was going to explode. The overdrive allowed me to cruise well beyond 60.

 

[MerlintheMad]

Did anyone notice that top speed was obtained in 6th gear. Looks like there is not enough power to pull greater speeds from 7th and 8th unless they are governed.

I hit 155 MPH in 7th gear; and backed off; it was still pulling strongly. In fact I did all my accelerating from c. 75 to 155 in that one gear. I wasn't in any hurry to get there! But it was floored the whole time. The road was, of course, perfectly straight and only had small rises and dips in it (Hwy 95, heading out of Oregon).

 

[Tonkabob]

Their 60 foot time of 2.1 is really bad. 2.0 is pretty easy to do in the stinger. So they could have hit 12.9 or below which would look way cooler than a 13.0 1/4 mile.

 

[BBB]

I'm assuming these tests were done on a new car that hasn't been through the break-in period or maybe a pre-produciton tester? This is true for gas mileage. I'm starting to see better mileage than when I first purchased my Stinger. Does the same hold true for 0-60 times etc...?

 

[Paul32]

I hit 155 MPH in 7th gear; and backed off; it was still pulling strongly. In fact I did all my accelerating from c. 75 to 155 in that one gear. I wasn't in any hurry to get there! But it was floored the whole time. The road was, of course, perfectly straight and only had small rises and dips in it (Hwy 95, heading out of Oregon).

Did you read about the tire that gave way at 70 mph?