Ex works Vauxhall Astra BTCC track car
Discussion
VX BlackRat said:
Cheers mate, Helix can reverse engineer me a flywheel, just waiting on a price.
Meanwhile SGS have just opened up the Xtrac, initial look at the internals seem to be in good nick.
Any more pictures or schematics of the transmission? Do you know the maintenance schedule on the gears and bearings?Meanwhile SGS have just opened up the Xtrac, initial look at the internals seem to be in good nick.
Hooked up with the Xtrac lads at the last BTCC meet at Silverstone, they were really helpful. I've got the Xtrac 406 manual with all the exploded views & TSB's - but not sure they will be happy if I post them here.
Table below shows component life in Km's, apparently the components were too good and they didn't sell anywhere near the volume needed from a business POV supporting TOCA. Good news for me though.
Table below shows component life in Km's, apparently the components were too good and they didn't sell anywhere near the volume needed from a business POV supporting TOCA. Good news for me though.
Chuffing cold in the garage ATM so not too much physical activity but I’ve been specifying and getting custom engine parts made. There’s a quite a few tuning company’s in the states that are suppling parts. Luckly I’ve got access to the original engineering drawings for the OEM stuff so it’s been quite easy to customize these for my 2.4 NA race engine. Main spec….
Molnar forged con rods
Wiseco lightweight forged pistons – 12:1CR so should be OK for super unleaded
Bottom end will be balanced
Supertech o/s valves and uprated valve springs
Cylinder head port and polish - I’m going to give this ago myself.
Haven’t decided on the final camshaft profile yet, there are quite a few to choose from e.g. comp cams but could also get a custom grind. The inlet cam also needs to interface with the cam position sensor & drive the power steering pump so it’s not too straight forward.
Custom flywheel has been fabricated by TTV Racing and I’m really impressed by their work, hopefully I’ve measured the timing lobes to TDC correctly!….
Gearbox is having a new 6th gear made to suit the lower rev range. Should be ready later this month.
Clutch is at AP getting a refurb
ECU is going to OBR to get new internal battery and ‘safe’ base map.
All being well I’m targeting June for initial shakedown
Molnar forged con rods
Wiseco lightweight forged pistons – 12:1CR so should be OK for super unleaded
Bottom end will be balanced
Supertech o/s valves and uprated valve springs
Cylinder head port and polish - I’m going to give this ago myself.
Haven’t decided on the final camshaft profile yet, there are quite a few to choose from e.g. comp cams but could also get a custom grind. The inlet cam also needs to interface with the cam position sensor & drive the power steering pump so it’s not too straight forward.
Custom flywheel has been fabricated by TTV Racing and I’m really impressed by their work, hopefully I’ve measured the timing lobes to TDC correctly!….
Gearbox is having a new 6th gear made to suit the lower rev range. Should be ready later this month.
Clutch is at AP getting a refurb
ECU is going to OBR to get new internal battery and ‘safe’ base map.
All being well I’m targeting June for initial shakedown
VX BlackRat said:
Chuffing cold in the garage ATM so not too much physical activity but I’ve been specifying and getting custom engine parts made. There’s a quite a few tuning company’s in the states that are suppling parts. Luckly I’ve got access to the original engineering drawings for the OEM stuff so it’s been quite easy to customize these for my 2.4 NA race engine. Main spec….
Molnar forged con rods
Wiseco lightweight forged pistons – 12:1CR so should be OK for super unleaded
Bottom end will be balanced
Supertech o/s valves and uprated valve springs
Cylinder head port and polish - I’m going to give this ago myself.
Haven’t decided on the final camshaft profile yet, there are quite a few to choose from e.g. comp cams but could also get a custom grind. The inlet cam also needs to interface with the cam position sensor & drive the power steering pump so it’s not too straight forward.
Custom flywheel has been fabricated by TTV Racing and I’m really impressed by their work, hopefully I’ve measured the timing lobes to TDC correctly!….
Gearbox is having a new 6th gear made to suit the lower rev range. Should be ready later this month.
Clutch is at AP getting a refurb
ECU is going to OBR to get new internal battery and ‘safe’ base map.
All being well I’m targeting June for initial shakedown
I'd like to think with some careful mapping and fresh fuel, you'd be alright with 95RON at 12:1 these days.Molnar forged con rods
Wiseco lightweight forged pistons – 12:1CR so should be OK for super unleaded
Bottom end will be balanced
Supertech o/s valves and uprated valve springs
Cylinder head port and polish - I’m going to give this ago myself.
Haven’t decided on the final camshaft profile yet, there are quite a few to choose from e.g. comp cams but could also get a custom grind. The inlet cam also needs to interface with the cam position sensor & drive the power steering pump so it’s not too straight forward.
Custom flywheel has been fabricated by TTV Racing and I’m really impressed by their work, hopefully I’ve measured the timing lobes to TDC correctly!….
Gearbox is having a new 6th gear made to suit the lower rev range. Should be ready later this month.
Clutch is at AP getting a refurb
ECU is going to OBR to get new internal battery and ‘safe’ base map.
All being well I’m targeting June for initial shakedown
Regarding the head, I wouldn't go to mad with the DIY porting. Modern heads will only be a few mm's thick before you break into the water jacket. I'd be looking at just removing casting imperfections, smoothing radius's off, matching to the manifolds, etc
AP have just condemned the clutch, apparently beyond economic repair. It’s a sintered twin plate 140mm unit rather than a carbon / carbon (£5k ouch!) that some of the engines were running.
Full replacement from AP is just shy of £1k. 6-8 weeks lead time, these things may be quick on track but getting parts is anything but....
Full replacement from AP is just shy of £1k. 6-8 weeks lead time, these things may be quick on track but getting parts is anything but....
andy97 said:
Is it a legit BTCC car? Seems to have regular 5 lug wheels rather than centre locks. Whole thing just looks a bit off.
andy97 said:
I believe that to be this car here:http://www.touringcarregister.com/register/200/
and here it is before in happier days:
http://www.touringcarregister.com/register/254/
Simon
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