Racing TVR's - Cosworth Turbo S
Discussion
In the new for 2004 TVRCC CHallenge cup
We will be allowing ANY yes ANY TVR to take part.
So long as the engine 'Block' was fitted at some point by the factory!
Therefore
Cosworth powered Ss would be eligible.
So would Cosworth Tasmins!!
Watch out for 2004!
If you're interested
Call me
Steve Lewis
steve@b-chip.com
07785 773341
We will be allowing ANY yes ANY TVR to take part.
So long as the engine 'Block' was fitted at some point by the factory!
Therefore
Cosworth powered Ss would be eligible.
So would Cosworth Tasmins!!
Watch out for 2004!
If you're interested
Call me
Steve Lewis
steve@b-chip.com
07785 773341
Not sure if you could tempt graham (gbgaffer) in on this I know he was considering sprint this season just gone but the car wasn't quoiet finnished in time. Whilst not a turbo he has a S4C with a rather 'special' cossie V6 under the bonnet that is pretty much a 500 slayer from what I've seen 
.
Harry
. Harry
The engine, to quote Steve Heaths 'S' bible, was a "Ford FS500 Evolution Cosworth turbo charged engine, as used in the Touring car Sierra Cosworth saloon .... It was prepared to full Group A specification by Terry Hoyle and produced 480-500bhp @6800rpm .... for a car weighing 810kgs it had a HUGE power to weight ratio", if that helps 
.
Harry
. Harry
sevans said:
Does anyone know which Cosworth engine was fitted to the S in the video?
Steve, when you say Cosworth Tasmin's are allowed, which Tasmin had a Cosworth block fitted at the factory. I know there were a couple of Turbo'd cars but didn't think they were Cosworth.
lol just seen this thread again .
there were no tasmins or any other TVR fitted with the cosworth block AFAIK. the cosworth was the 205 block and derivatives, the 2litre tasmin (pinto) was the 200 block i think, therefore arent all the current turbo tasmin race cars illegal? .. should make points totting up at the end of the season interesting
lmao!
shpub said:
Go read the small print . It says any block fitted to any TVR road or race. So if someone hyperthetically fitted a cerbie engine into an S that would be eligable. So would a Triumph Herald engine, a Ford side valve, MGB... What about a Holden V8.... Effectively almost anything!
Don't think it matters how small the print .. can't ever remember the cossie block being fitted ... guess it's just a case of how far you can bend the rules .. it's racing after all .. the nature of the beast is to *do it* and see if anyone picks up on it later
Dumb question: If TVR chassis' are as floppy as has been asserted here (and I don't know either way) doesn't that mean they're, er, not very good? How would they compare, for example, with the original home of the Cosworth turbo engine in the Sierra Cosworth? Cossie Sierras don't seem to suffer unduly from having 600bhp....
zumbruk said:
Dumb question: If TVR chassis' are as floppy as has been asserted here (and I don't know either way) doesn't that mean they're, er, not very good? How would they compare, for example, with the original home of the Cosworth turbo engine in the Sierra Cosworth? Cossie Sierras don't seem to suffer unduly from having 600bhp....
Steel monocoque body with about 200 kg of internal roll cage and bracing tends to help.
shpub said:
The Cossie block was fitted to a Cosworth S race car. That means it can be fitted to any TVR as far as the regs go. Doesn't have to have been fitted to the TVR model that is being raced.
Apparently that is good enough...
>> Edited by shpub on Tuesday 20th July 16:47
this would indeed appear to be the case
zumbruk said:
Cossie Sierras don't seem to suffer unduly from having 600bhp....
shpub said:
Steel monocoque body with about 200 kg of internal roll cage and bracing tends to help.
Yep, plus the shell is supplied as a bare shell at which point it is fully seam welded (as opposed to spot welded). The cages they put in those things are just awesome. They almost become a spaceframe with a body tacked on for extra rigidity, only thing is the engine, transmission and suspension still has to be mounted to the original shell, hence it's effectively a half and half spaceframe/monocoque. Stiff as you like.
Sorry, I (and I think Steve also) thought you meant Gp.A Cossie Sierras, not roadgoing ones. The road cars were stock 3dr. shells.
Plenty of people put the far side of 500bhp through regular roadcars. Just look at the number of modded Skylines and Supras, some of which pull incredible numbers on the dyno. The fact is that a standard roadcar shell (read: pressed sheet metal not TVR style tube) without a cage is less rigid that one with. The car without the mods writhes and twists under power making any suspension and geometry settings a waste of time because the torque simply distorts the whole car. Yes it'll be quick round a circuit, but not as quick as a similar car with a seam welded shell and integral cage, simply because the latter car can make the suspension and geometry work predictably in the manner you require.
It's no surprise TOCA cars are seam welded and feature massive cages - it's not just for safety - if that was the case, they'd just have a cage round the driver like a cocoon and sod everything else. Massive rigidity is to be had from these mods and the result is a better and more predicable handling car.
TVR's with their tubular backbone chassis are a very different approach to that of a regular productions car (eg: a Sierra) and I can't begin to understand the priciples, but as I understand it : Strength comes from box and triangular braced sections. A regular car has the height of the whole shell to make a box section including the roof etc, so you do get an enormous box size. TVR's get an 18" high chassis to do the same thing, so have to have massive strength built into that 18" high tubular chassis to compensate for the fact that the chassis isn't 4 foot high like a pressed steel monocoque. Adding the roll cage onto this raises that box section from about waist level (chassis tubes running down the transmission tunnel are about as high as they get) to right above the driver's head. This created a higher box with greater rigidity. The box is more cube shaped and therefore you have more scope for strength.
This is why many estate cars are actually stiffer than their saloon / coupe counterparts (hence Volvo running the BTCC 850 estate cars - it wan't just a marketing prank)
Plenty of people put the far side of 500bhp through regular roadcars. Just look at the number of modded Skylines and Supras, some of which pull incredible numbers on the dyno. The fact is that a standard roadcar shell (read: pressed sheet metal not TVR style tube) without a cage is less rigid that one with. The car without the mods writhes and twists under power making any suspension and geometry settings a waste of time because the torque simply distorts the whole car. Yes it'll be quick round a circuit, but not as quick as a similar car with a seam welded shell and integral cage, simply because the latter car can make the suspension and geometry work predictably in the manner you require.
It's no surprise TOCA cars are seam welded and feature massive cages - it's not just for safety - if that was the case, they'd just have a cage round the driver like a cocoon and sod everything else. Massive rigidity is to be had from these mods and the result is a better and more predicable handling car.
TVR's with their tubular backbone chassis are a very different approach to that of a regular productions car (eg: a Sierra) and I can't begin to understand the priciples, but as I understand it : Strength comes from box and triangular braced sections. A regular car has the height of the whole shell to make a box section including the roof etc, so you do get an enormous box size. TVR's get an 18" high chassis to do the same thing, so have to have massive strength built into that 18" high tubular chassis to compensate for the fact that the chassis isn't 4 foot high like a pressed steel monocoque. Adding the roll cage onto this raises that box section from about waist level (chassis tubes running down the transmission tunnel are about as high as they get) to right above the driver's head. This created a higher box with greater rigidity. The box is more cube shaped and therefore you have more scope for strength.
This is why many estate cars are actually stiffer than their saloon / coupe counterparts (hence Volvo running the BTCC 850 estate cars - it wan't just a marketing prank)
zumbruk said:
Err, Sierra bodies are nothing special in the strength front, and I've ridden in an uncaged 600bhp Sapphire 4x4 which seems to work well enough - at least all the failures are drivetrain related rather than body.
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