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TR6 How fast can a TR6 go?

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Thanks guy's kind of nice I don't get flamed here.
Why would I want to go that fast in a TR6 ? I don't know if I do. My car has gone 154 in the 1/4 mile and things seem OK, don't know what faster speeds will be like. Years ago I thought going 200 MPH in a car was a good goal, well I am getting older and if I don't do it fairly soon it likely won't happen. Here's a video of my car running about 154MPH looks quick till the low 7 second Vette go's by.
And like I said I am bored and its too cold to do much on the car, is it spring time yet?
https://www.youtube.com/watch?v=rhcwASSg8y8
 
Thats the video I was talking bout!
:banana:
I guess Im an old fart cuz I think these cars are for touring :driving:
 
Interesting but apples/oranges to me.
If I really wanted speed in a straight line I'd get a good old American lump and do it.
Twisties, handling, balance and speed= sportscars to me.
But, each to his own and your car really moves.
 
Now that is a TR-QUICK!!

I used to work with a Pro Stock IHRA team.
Never got to go down the track, just watch and dream.

the love of cars and speed never goes away!

If you get a TR to anywhere close to 200 I want pictures!

Dave :thumbsup:
 
As with most Triumph roadsters, to me, ANY speed in a Triumph is a good one!

10, 40, 100mph: makes no diff to me. It's always a thrill! :yesnod:
 
as long as its on its own power


24-hour-flatbed-towing.jpg
 
On paper mine should top out at 161mph. Real world I hit 153mph on the GPS when it hit the rev limiter in 5th. No aerodynamic mods to my TR6 and it was surprisingly stable. I have taken it down 40mph posted lake roads 90-110 thru the twisties and it was fairly predictable but the loud pedal likes to fight the understeer all too easily. The the way I have built and tuned my M3 engine it really comes alive around 4500rpm. So if you're grabbing a gear and drop to 3500ish you've got to be cognisent of this especially in a corner as it will kick its tail out without a change in the throttle setting (highway on ramps).

My main issue is that I'm turning a hair over 3500rpm at 70mph when just cruising around in 5th. I'd like to drop that by 500-750 and since I've already got the highest gear set for the R200 (3.54) I'm going to have to switch over to a BMW diff or the simple solution, an M3 6-speed tranny. All the ratios stay the same in this but adds a .85 OD in 6th which should net me 200mph flat out if I up the profile one notch on my tires (fun to think about but no way am I intersted in testing the limit if I make the change).
 
Tred,

I built the engine to 8000rpm (7000rpm stock) spec so with the 3.54 diff., 1:1 5th gear and 24" diameter rubber that's all she can go. I wish someone out there (Nismo or the like) had cheep ring and pinion sets for these diffs. Unfortunately, all the drifters want a lower geared set so there's plenty of options north of 4:10 but none the way I want to go. My first gear is pretty worthless as it is and I start in 2nd 75% of the time when just cruising around. Another nice thing about the tranny swap is that it won't change any driveline components as it's direct bolt-in and the same size more or less.
 
I have no interest in going faster, I would just like to drop the r's a little on normal highway cruising. A stock M3 turns about 2750 at 70 and I'd like to get it down around 3000.

You know, trying to keep my carbon footprint a little lower. Actually, there's really not much green about me so that's a lie:smile: I should probably be buying polution credits as a hedge against the future when the gov't decides to crack down on individuals. I burn a lot of gas with my toys (sorry Al Gore).
 
F1 engines turn 19,000 RPMs. More if they aren't restricted.

Once you get past about 14,000 you can't find materials strong enough to open and close the valves fast enough and have to find a different solution. Desmodromic valves are what F1 used initially.
https://en.wikipedia.org/wiki/Desmodromic_valve

Now they use some gas powered pnuematic valve systems. Details are sketchy, but essentially, opening one valve closes another valve (on a different cylinder).

The reason I mention this is because the higher the RPMs the more horsepower you make. (Torque / 5252) * RPMs = HP. If you want to make more power to go faster than the valves are generally the area that holds you back.

Bob Norwood has a great site about a 1 liter MR2 running at Bonneville and reaching 206 MPH... https://www.bobnorwood.com/The Fastest Little Sports Car in Utah.htm.

It's definitely possible to make a small engine (2.5 liters is pretty small) pull huge numbers, especially if you can get the revs up.
 
I forget what the rev numbers were, but back in the 80"s, Honda's
F1 engine produced 650 bhp from 1.5 litres of V6 engine.
They also have produced a motorcycle engine that revs, 17,000 easily.

Honda's forte is engines

Dave :savewave:
 
I think the all time champ of small engines was the 2.3 liter Olds Quad 4. They built one for the salt flats that put out over 1,000 hp. The reason it held together was that the head bolts went all the way through the block and there were no threads in the block. It made less stress in the engine and allowed for stretch instead of breaking.
 
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