Anyone ever done this? Having examined Vauxhall's hydro-mechanical (or whatever it is) system and declared it useless, I'm toying with either a Ford system from an Escort Cosworth or a late model Torsen 40:60 diff from an Audi UR quattro. My car has around 230bhp and has a much lightened shell. Am I better off with one of these Quaife ATB LSD's, given that I plan to increase power to 300bhp+ over time?
Originally posted by turboFish Having examined Vauxhall's hydro-mechanical (or whatever it is) system and declared it useless
All depends on the owner does that one.
The GM stuff is upto handling 300BHP+. There is a MK1 Astra running 300BHP+ and Vauxhalls own 4WD system that has been modified to give a permanent 60/40 split and its just behind a MODIFIED Audi RS4 in the sprint times.
If you are serious about extracting power and turning your car into a 4WD setup then have a look at this site who have done it all plus more - Carls Motorsport Team
Gavin at Wallace Performance should be able to help with them as well as he deals with them direct for the C20LET Phase kits
Ste_sa, the rear diff is normal Vauxhall stock, its the rear diff assembly thats from the Holden Commodore 4.0 V8.
Whatever you choose its not going to be easy, more so the chassis modification to take the rear diff and driveshaft.
Yes... it's just a MK1 Astra, started life as a GTE. Nothing special about the floorpan on it, just stock.
I like the Carl's Motorsport Team site, a pity there aren't more pictures of the car itself, but what an odd place for an oil cooler!! Never thought of putting one there... not much good for rallying though, one rock is all it would take to K.O. that baby.
Also, I wasn't aware the Vauxhall 4WD system could be modified to permenant 60:40 split, who can do this in the North West, and at what cost? It sounds way too ambitious for me to attempt!
And Ste, I think I'd probably leave the engine mounted transversely. And I'd prefer not to use Ford parts if I can help it, although RS bits are okay at a push.
Yes, that's the one. It's got what Courtenay call a "stage one" tune - two head gaskets, adjusted actuator and a remapped ECU - I originally ordered a Quaife diff from them but after 4 months it still hadn't arrived so they said this conversion was the same price and would I like that instead. They told me the boost would come in a little earlier and a bit harder, and I should expect 10-15% more go. I'd rather have had the LSD but I didn't have much choice at the time!
Are these Quaife ATB's as good as everyone says? Given that I don't actually drive my car in the wet very often, a 4WD system might be a little extreme.
Of you are serious about reaching 300BHP+ then you will have to forget both Courtney and Regal I am afraid. They just aint up to it without spending LOTS.
Carls Motorsport can get you above the magic 300BHP but you might find it more difficult with the lack of space in the Astra for the intercooler. Why not try a custom cooler, they aint as expensive as ppl think
The oil cooler they have there is a prototype for an uprated T/X box to keep it all cool.
The only ppl that do the conversions for the Vauxhall 4WD system as in Switzerland. Take a look at their site - Dorfbrunnen Garage
They have taken over all the equipment from Steyr-Daimler-Puch (ppl that designed/made the orginal t/x box) and have a seriously good rep for repairs/overhauls/conversions.
TBH tho, if you want a serious machine in the form of a MK1 Astra Turbo then speak to Dave Fraczak. he is on this board under the name NotNormal and runs a MK1 Astra Turbo running serious power thru the Quaife LSD.
Do a FAO: post on General or in here to get his attention
Didn't think it would be such a problem to get over 300bhp? I'm assuming I'd need to change the pistons for lower compression forged items, then (correct me if I'm wrong, I'm no expert, just going off what I've heard) a chargecooler should give an extra 30bhp at least. Then a good old fashioned port n' polish should get the flow rates up, and an MBE management system would allow an accurate map. I'm also aware that the turbocharger itself has limitations and would also benefit from being swapped for one of these hybrid things to allow more boost.
Would this not net me over 300bhp?
What sort of numbers would I get minus the MBE system?
Can the MBE system be used on an engine above, but retaining the standard turbocharger, or is it not worth it?
I've spoken to Dave Franczak before he got his turbo conversion, but wasn't aware he had a Quaife ATB in there. I saw his car at Trax last weekend but couldn't find the southern bugger.
I used to have "Flash International" (German Opel Car Mag) shipped to me. In one of the issues there is a Astra mk1 with most of a calibra turbo shelled inside it!. Its got all the 4x4, turbo engine, ABS, leather trim etc etc after trying to translate it, its says he's welded in the whole caibra floor pan with pics of him cutting the mk1 out and welding in the calibra one! if you want me to scan in the article let me know. I think he's running 300BHP.
Fantastic! Yes please Rob, I'd love to see that article. I used to buy Flash myself (lived in Germany for a year) but never saw that issue. If you could mail it to me at email@example.com I would be most grateful! Many thx