|Speed Sixes Model Area Editor; Andy Thomas
Welcome to the Tuscan, Tamora, T350 and Sagaris (or Speed Sixes) page. These are all combined for the moment but will be separated onto their own pages in due course.
Speed Six refers to the TVR designed and manufactured straight six engine fitted to the final TVR model range right up up to the closure of the TVR factory. The Speed Six Engine was announced for the Griffith Speed Six at the 1996 Motor Show. The engine was then shown in a Cerbera* in 1997 as an alternative to the AJP V8 but was the only engine used in the Tuscan, then the Tamora, the T350, Sagaris, T400, T440 and Typhon.
*The Cerbera has its own model page on this website.
TVR have got rather fond of the Tuscan name, first used in the 60's for a V8 and V6 car. It was later used for the Challenge Race Series with both Rover and AJP V8 power. Various road Tuscans were announced but the near final form was shown at the 1998 Motor Show, with deliveries in early 2000. However TVR haven't finished with the name with Red Rose versions and Tuscan S derivatives. A new, larger 2+2 car was labelled Tuscan R in 2002, but later changed name to T400, T440 and Typhon, depending on power output. A race version, the T400R went on to race at Le Mans in 2003 and 2004.
To add to the mix at the 2004 Motorshow TVR introduced a Tuscan Convertible and restyled Tuscan Mk II and Tuscan MkII S.
Next to hit the dealers was the Tamora, this was the cheaper starter TVR, except TVR don't really do starter cars....
The Tamora was first shown at the 2000 Motor Show and was to replace the convertible Chimaera in the line-up. The car returned at the 2001 Show with less chrome styling and was delivered in 2002. The main visual chances during production have been the black styling bits can be body coloured if specified, which in my opinion make the tea tray diffuser at the back much better
T350 (FHC and T)
Next up was the T350C which could be described as the Tamora Coupe, a Hatchback, or the return of the Taimar.
Hot on its heals came the T350T with a Twin sunroof or Targa style arrangement.
The final range was topped out with the radically styled Sagaris. Based on the T350 but with a wider track and the 4 litre version of the engine previously found in the Tuscan S.
The Typhon was effectively a T400 with a supercharger added. Although no cars were ever delivered to customers, rumours of engine outputs went as high as 600 bhp.
|TVR were a long way from their kit car roots, more of each TVR was built in house at Blackpool, than Ford build their cars.
As the engine is bespoke TVR, It is recommended you speak to a known specialist or dealer.
The speed six engines comes in a number of different sizes and power outputs.
Tuscan 4.0 360 bhp
Tuscan 4.0 Red Rose 380 bhp
Tuscan 3.6 350 bhp
Tuscan 4.0 S 390 bhp
Tuscan 4.0 S 400 bhp
Tuscan 4.0 Mk II 365 bhp
Tuscan 4.0 S Mk II 405 bhp (now revised down to 380 bhp)
Tamora 3.6 350 bhp
T350 3.6 350 bhp
Sagaris 4.0 405 bhp (now revised down to 380 bhp)
Diagnostic codes Tuscan Mk I
A - Speedo sensor not activating zero switch or switch broken
B - Speedo sensor not releasing zero switch or switch broken
C - Water level sensor not activating zero switch or switch broken
D - Water level sensor not releasing zero switch or switch broken
E - Fuel level sensor not activating zero switch or switch broken
F - Fuel level sensor not releasing zero switch or switch broken
G - Water level sensor open circuit
H - Air temp sensor open circuit
I - Oil temp sensor open circuit
J - Oil pressure sensor open circuit
K - Fuel level sensor open circuit
L - Erratic road speed sensor input
O - No communications between analogue and control
Optimum tyre pressures will depend on size, make of tyre, and also date of manufacture of the car.
The standard Tuscan Mk I has different size wheels on the front than the back. They either came with 35 or 40 profile tyres. The equivalent sizes are as follows
Front 18/225/35, Rear 18/255/35
Front 18/235/40, Rear 18/245/40
The manual specifies the 16" wheel pressures but not the 18". Here are some examples in psi.
2001 Tuscan 4.0 18/235/40 18/245/40 Bridgestone S02 22/24
2001 Tuscan 4.0 18/235/40 18/245/40 Toyo T1-S 24/26
2005 Tuscan MkII 4.0 S 18/255/35 18/255/35 Eagle F1 GSD3 28/28
Ignition coil fuse
If your car won't start, it will be worth checking the ignition fuse, # 17. On earlier models the fuse rating was updated from 15 to 20 amps.
Speedo pod vibrating
There are a number of causes for the speedo pod to vibrate, all of which can be fixed.
Wheels not balanced (low profile types on the Tuscan, especially on 18 inch wheels are very sensitive to in-balances).
Suspension out of alignment
Wheels buckled. The inside rim of wheels on earlier cars could deform, for example, if crashed into a pothole. Later cars had heavier wheels with this area strengthened.
Speedo reading not correctly
On the Mk I Tuscan there are two speedo readings, the brass needle and the electronic readout.
If the electronic readout is incorrect, this points to the speedo sensor needing cleaning or being replaced. A dealer can do this. If the electronic readout is correct but the brass needle is wrong, this will require the pod being removed and sent back to the factory for fixing.
The oil pressure sensors can start leaking. This can be seen from oil spotting under the car on the offside, nearer the bulkhead than the front. Oil pressure readings at idle, which varies from 700-900rpm, are reported to vary from 18psi to as low as 7 psi. If in doubt check with your dealer. The pressure reading should rise with revs. If the pressure does not rise significantly as the engine speed increases this is likely to be a faulty sensor but you should get it checked out by your dealer asap in case something more serious is wrong.
One cause of poor or none starting is corrosion causing a poor contact between the earth strap and the chassis. To fix, jack the car up and remove the front offside wheel. Reach in to the back of the wheel arch to see the earth strap. Unbolt the ends and clean everything, especially the contact point on the chassis. Refit and cover with grease to protect..
In general if the engine stutters it could just need a service. However there are some specific fixes:
If your engine stutters at constant, modest rpms e.g. 2500 this could be down to worn throttle bodies. There are a number of third party parts which aim to fix this wear on a more permanent basis.
If the stuttering occurs at higher rpm and larger throttle openings e.g. 6000 rpm, this could be down to a broken coil or worn HCT leads. There is a known problem with a vibration of one of the throttles causing the ECU to misfuel causing a stutter at high rpm. There is a modified ECU which can mask the problem satisfactorily.
If one of the engine fans comes on permanently or doesn't come on at all, it could be the temperature sensor located underneath the airbox is not connected well. Water can get trapped in the connector causing the fans to incorrectly function. Note this is also the temperature reading used by the ECU so the engine may not be running correctly. Also note there is a separate sensor which is used for the driver's electronic temperature readout.