V12V Bamford Rose upgrade - cat is out of the bag!!
Discussion
knell said:
A while ago I upgraded a 4.3 and it was said (had before and after dyno) at the time I got over 40bhp extra power, but after a while I realised that it wasn't really faster, it just sounded better.
I suspect you bought your upgrades from the wrong people then. 
We had lightened flywheel, 200 cell cats, ECU changes and manifolds last year.
The driving experience is night and day. If it's only 40bhp different I'd be amazed... just shows that bare numbers tell you nothing.
The biggest difference is the improvement in torque which means where I'd be grabbing 2nd previously it'll pull in 3rd (or 4th).
I know Bincenzo is similarly enamoured with his conversion too.
That's not to say it doesn't stop me hankering after a 5.0 litre though.
peterr96 said:
I suspect you bought your upgrades from the wrong people then.
We had lightened flywheel, 200 cell cats, ECU changes and manifolds last year.
The driving experience is night and day. If it's only 40bhp different I'd be amazed... just shows that bare numbers tell you nothing.
The biggest difference is the improvement in torque which means where I'd be grabbing 2nd previously it'll pull in 3rd (or 4th).
I know Bincenzo is similarly enamoured with his conversion too.
I've had the same. It's amazing.We had lightened flywheel, 200 cell cats, ECU changes and manifolds last year.
The driving experience is night and day. If it's only 40bhp different I'd be amazed... just shows that bare numbers tell you nothing.
The biggest difference is the improvement in torque which means where I'd be grabbing 2nd previously it'll pull in 3rd (or 4th).
I know Bincenzo is similarly enamoured with his conversion too.
Hi Speculatore, many thanks for the reply. My dyno also showed an improvement too, but it wasn't real. In your case I can believe its possible to get from 450 to over 500 as Aston have already shown it can be done on this engine. The question for me is can you get to 570 without new RCU, knock senators and variable cam timing.
Many thanks
Many thanks
Hi Peterr96, thanks for the feedback glad you are happy. I was too originally with my 4.3 upgrade and when I look at what I said at the time (http://www.amoc.org/forum/index.php?topic=10226.130) I now think it's obviously you can convince you have had an improvement very easily when you have spent a lot of money. The sound also helped. By the way Paramount did the work.
Many thanks
Many thanks
knell said:
Hi BravoV8V thanks for the reply, how long ago did you have it done is it recent, or have you had it done for a while. Took me six months to arrive at the blindingly obvious conclusion 
I had the work done a few months ago.But there is a significant difference between what you changed and what I(/we) changed. You changed everything from the 'cats back'. But you left the single greatest source of restrictive airflow in the exhaust system - the heavy OEM AM manifolds. So I'm not surprised that your improvements were primarily aural.
If you had changed the manifolds as well, then you would have also seen significant actual performance improvements.
Hi BravoV8V, the cats on my V8 were changed too, at the time as they were said to be too restrictive so would yield the power increase. But glad you are still happy with yours, when I changed from 4.3 to 4.7 there was a real and sustained difference, not the same as the change to V12 but still worth it.
I wonder why Aston for the V12S went the route of variable valve timing, new ECU and knock sensors if they just needed to change the manifolds to get +55 BHP?
I wonder why Aston for the V12S went the route of variable valve timing, new ECU and knock sensors if they just needed to change the manifolds to get +55 BHP?
Gassing Station | Aston Martin | Top of Page | What's New | My Stuff