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Accelerating in 6th?

CraigJ

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Just a question for owners with boosted manual cars.

The few that have been high speeds, does the car pull once into 6th?

I have a 640whp manual with 3.55 rear end 8k rpm. It hit the limiter at 182mph in 5th over a standing mile (wet) Didn't get to accelerate much in 1/2/3rd gears due to spin so only got on the power after 80mph.
I plan to do the event again next year when the weather is dry and i now know i will hit the limiter before the end of the mile and will have to go up to 6th.

Has anyone got experience of getting into 6th at those speeds? does the car continue to pull or am I best of looking at changing the gearing?

Thanks
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Interceptor

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I'll respond since I doubt few will be able, but...not a 5.0
I took my 2003 tuned SVT Cobra to the top one day. It too was a 6 speed 3/55 gear car but only 477 to the wheels.
5th gear pulled good, but 6th gear got lazy so at 170 I let up worring about heating up Eaton and burning pistons, plus running out of straight road. Speed was read from cars odometer by passenger. Passenger forgot to check RPMs at that speed
 

Rebirth_18

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Just a question for owners with boosted manual cars.

The few that have been high speeds, does the car pull once into 6th?

I have a 640whp manual with 3.55 rear end 8k rpm. It hit the limiter at 182mph in 5th over a standing mile (wet) Didn't get to accelerate much in 1/2/3rd gears due to spin so only got on the power after 80mph.
I plan to do the event again next year when the weather is dry and i now know i will hit the limiter before the end of the mile and will have to go up to 6th.

Has anyone got experience of getting into 6th at those speeds? does the car continue to pull or am I best of looking at changing the gearing?

Thanks
I'd just swap rear end gears and add more power rather than pull in 6th.
 

F1scamp

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Yeah, with 3.31's and a 28in tire it will go 199mph in 5th at 8k rpm.
 

Bluelightning

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Just a question for owners with boosted manual cars.

The few that have been high speeds, does the car pull once into 6th?

I have a 640whp manual with 3.55 rear end 8k rpm. It hit the limiter at 182mph in 5th over a standing mile (wet) Didn't get to accelerate much in 1/2/3rd gears due to spin so only got on the power after 80mph.
I plan to do the event again next year when the weather is dry and i now know i will hit the limiter before the end of the mile and will have to go up to 6th.

Has anyone got experience of getting into 6th at those speeds? does the car continue to pull or am I best of looking at changing the gearing?

Thanks
183 is the hard coded speed limiter. Even if you are shifting into 6th you won't go faster unless you unhook the wheel speed sensors to get around the limiter.
 

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aleccolin

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6th is pretty useless except for highway fuel economy. A re-gear to 3.31 would help run out 5th, but will neuter your around-town game. I don't know what aftermarket gearsets are offered for the MT-82, but for a boosted application the Magnum XL is a good choice since 1st - 3rd are a little taller and more useable, 4th is your 1:1 and 5th is either a 0.80 or 0.74 vs the MT82's 6th of 0.65. Then you have a double OD 6th either 0.63 or 0.50 depending on what gearset you choose. I borrowed this graph from the thread linked below, this is with a 3.73 rear. He's also using a custom 2.66 gearset with the OD gears from the 2.97 gearset.

img_2692-png.png


https://www.mustang6g.com/forums/threads/installed-a-tremec-magnum-xl-in-my-s550.115797/
 
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CraigJ

CraigJ

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183 is the hard coded speed limiter. Even if you are shifting into 6th you won't go faster unless you unhook the wheel speed sensors to get around the limiter.
I have spoke to Rob at PBD about this and he has just sent an updated tune to remove the 186mph limiter so that should be sorted now.

I have spent the last few hours doing to reading and it looks like a 3.15 rear gears will give a top speed in 5th of 209 at 8k rpm so this should do me.
I will just build up a 3.15 diff and fit for the event to see if i can make it over 190 in the mile.
 
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CraigJ

CraigJ

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Wasn’t soaking on the 182 run just very damp but it rained on the last run at 180.

 

Barrel

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Don't pull in 6th. Gears, tires, trans, whatever to get the speed you want - but 6th in the MT82 is too steep to pull in. You're very likely to hurt your motor that way.
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