Grantura top speed
Discussion
Nigel
I don't think mine would pull 7500 in top.
I reckon about 125mph at the 'ring, maybe a little more given the length of the straight. Mine pulls about 115mph at Spa with a 4.1. However if my Midget is anything to go by I'm quicker at the 'ring with a 3.9 than a 3.7 as you gain more on 12 miles of twists than you lose on 4 miles of straights thats 10.53 v 11.04 for Nordschleife and short GP.
HTH
R
I don't think mine would pull 7500 in top.
I reckon about 125mph at the 'ring, maybe a little more given the length of the straight. Mine pulls about 115mph at Spa with a 4.1. However if my Midget is anything to go by I'm quicker at the 'ring with a 3.9 than a 3.7 as you gain more on 12 miles of twists than you lose on 4 miles of straights thats 10.53 v 11.04 for Nordschleife and short GP.
HTH
R
Gearbox is an MGB 3 syncro box from Brown and Gammons - straight cut close ratio
Hi Richard,
Funnily enough I think the car would actually pull 7,500rpm on the slightly downhill main straight on the ring, but it is such a long straight that I would expect it to blow up at some point in a 3 hour race.
I am not unfamiliar with this, as in my Marcos (Essex V6 engine) I have twice blown an engine on the main straight at the ring, which tends to increase one's heart rate at 140mhp plus, in a car made from wood and glass fibre.
In the race we tend to impose a limit of about 6,500 - 6,800 on the TVR which equates to about 120 ish. When we looked at the video the main straight was not the fastest point for us, as the car did a bit more on the run downhill from Flugplatz, as I guess we were not looking too closely at the rev counter and just hanging on and trying not to clip a kerb...
Really looking forward to driving the car again and we have entered the HSCC race at Thruxton at Easter, so not too long to wait
Hi Richard,
Funnily enough I think the car would actually pull 7,500rpm on the slightly downhill main straight on the ring, but it is such a long straight that I would expect it to blow up at some point in a 3 hour race.
I am not unfamiliar with this, as in my Marcos (Essex V6 engine) I have twice blown an engine on the main straight at the ring, which tends to increase one's heart rate at 140mhp plus, in a car made from wood and glass fibre.
In the race we tend to impose a limit of about 6,500 - 6,800 on the TVR which equates to about 120 ish. When we looked at the video the main straight was not the fastest point for us, as the car did a bit more on the run downhill from Flugplatz, as I guess we were not looking too closely at the rev counter and just hanging on and trying not to clip a kerb...
Really looking forward to driving the car again and we have entered the HSCC race at Thruxton at Easter, so not too long to wait
Hansoplast said:
Well, this is man's talk and not for boys (me)
But I learn from the data that for quick street use a 3.9 is best?
And max rev 6000 is enough for my ears. (and engine)
Hans
Ear plugs optional but not that loud if you take the engine to GT Spec with higher compression etc mine red lines at 7000 and a 5 speed Sierra Box can recomend that set up for you hans if you have not had the engine and box done yetBut I learn from the data that for quick street use a 3.9 is best?
And max rev 6000 is enough for my ears. (and engine)
Hans
I dont have the spec for the engine here at the flat but can always get it for you if you need it.
A
Nigel
In the Midget I hit the rev limiter in several places at the Nordschleife - down the hill at Schwedekreuz, at the bottom of Fuchsrohre, up the hill after Klostertal and at the bottom of Flantzgarten just before the mini Karussell as well as bouncing off the limiter from about a quarter of the way along the straight. That's about 127mph on 155/70 ordinary road tyres.
A blow up at 130mph isng good whatever you are in. Unfortunately the Essex wont rev or hold together like a well sorted A series - BTW I pull more revs in my Marcos with bombproof volvo B18 than anything else - 130mph at Dijon. Are you planning on doing the Oldtimer GP Marathon this year? We are contemplating it although if I get an invite to the Goodwood Revival that will take precedence.
Hans I'd recommend a 4.1 for road use unless you are going to be driving a lot at high speed. They are expensive as the 3.9 is standard MGB and the 4.1 was only fitted to the MGA Twin cam and some 1600 mkII de luxe models. A 4.1 in my FIA MGB with overdrive is brilliant for road use.
In the Midget I hit the rev limiter in several places at the Nordschleife - down the hill at Schwedekreuz, at the bottom of Fuchsrohre, up the hill after Klostertal and at the bottom of Flantzgarten just before the mini Karussell as well as bouncing off the limiter from about a quarter of the way along the straight. That's about 127mph on 155/70 ordinary road tyres.
A blow up at 130mph isng good whatever you are in. Unfortunately the Essex wont rev or hold together like a well sorted A series - BTW I pull more revs in my Marcos with bombproof volvo B18 than anything else - 130mph at Dijon. Are you planning on doing the Oldtimer GP Marathon this year? We are contemplating it although if I get an invite to the Goodwood Revival that will take precedence.
Hans I'd recommend a 4.1 for road use unless you are going to be driving a lot at high speed. They are expensive as the 3.9 is standard MGB and the 4.1 was only fitted to the MGA Twin cam and some 1600 mkII de luxe models. A 4.1 in my FIA MGB with overdrive is brilliant for road use.
Hi Richard
Planning to do both the Eifelrennen and the Marathon this year in the TVR.
One of the many impressive things about the Marcos is how slippery they are, from memory they are quicker than both an Alfa GTA and Mustang on the main straight. Having eventually got a Ric Wood engine for our 3 litre wooden Marcos with 280 bhp it is a monster on the main straight.
If this link works at about 6:30 you can see the 3 litre do it's thing - happy days
http://m.youtube.com/index?hl=en-GB&gl=GB&...
Good luck with your Goodwood entry
Planning to do both the Eifelrennen and the Marathon this year in the TVR.
One of the many impressive things about the Marcos is how slippery they are, from memory they are quicker than both an Alfa GTA and Mustang on the main straight. Having eventually got a Ric Wood engine for our 3 litre wooden Marcos with 280 bhp it is a monster on the main straight.
If this link works at about 6:30 you can see the 3 litre do it's thing - happy days
http://m.youtube.com/index?hl=en-GB&gl=GB&...
Good luck with your Goodwood entry
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