VVC BHP differential
Discussion
I think the later VVC unit had the larger 52mm throttle body and allegedly a tweaked ECU. Maybe other changes too, I'm not sure.
I had an early VVC engine in my 7 and ended up tweaking it with the big TB, reprofiled exhaust cam, more fuel pressure all on top of a 4-2-1 exhaust. If I had to do it again I'd get the exhaust and leave it alone until I'd saved up for the 200bhp package of Emerald, fixed cams, individual TBs.
Edit to add: When I got the 4-2-1 exhaust the car made 164bhp on the rollers and felt fantastic, noticably more urgent than before. Recommended without reservation. The other work I did later, added just 8bhp and made the engine horribly peaky.
I had an early VVC engine in my 7 and ended up tweaking it with the big TB, reprofiled exhaust cam, more fuel pressure all on top of a 4-2-1 exhaust. If I had to do it again I'd get the exhaust and leave it alone until I'd saved up for the 200bhp package of Emerald, fixed cams, individual TBs.
Edit to add: When I got the 4-2-1 exhaust the car made 164bhp on the rollers and felt fantastic, noticably more urgent than before. Recommended without reservation. The other work I did later, added just 8bhp and made the engine horribly peaky.
Edited by lukeb on Saturday 14th April 21:04
4:2:1 around £800 from CC.
Once you have a decent exhaust, you need to get the car mapped, and probably get verniers fitted so the car cams are timed correctly. The standar cam timing is nearly always out.
When you have the car mapped, you will get true bhp, bhp claims of standard cars are sometimes off. My R300 engine made 162bhp after it had been mapped, it wasn't 160 before the mapping session. The fuel consumption and response was also greatly improved.
Once you have a decent exhaust, you need to get the car mapped, and probably get verniers fitted so the car cams are timed correctly. The standar cam timing is nearly always out.
When you have the car mapped, you will get true bhp, bhp claims of standard cars are sometimes off. My R300 engine made 162bhp after it had been mapped, it wasn't 160 before the mapping session. The fuel consumption and response was also greatly improved.
As above, or you could go to someone like Powerspeed, Exhausts by design, Hayward & Scott for a bespoke system. I went for EBD as I had a Raceco silencer and wanted a manifold to mate it with.
I'm not sure casbar has grasped the implication of it being a VVC engine. You won't need to time the cams in because the timing is variable, and as long as you're running the standard Rover ECU there is unfortunately no mapping that can be done.
I'm not sure casbar has grasped the implication of it being a VVC engine. You won't need to time the cams in because the timing is variable, and as long as you're running the standard Rover ECU there is unfortunately no mapping that can be done.
I guess YMMV to an extent, the difference in numbers is probably small but I was well impressed with mine. I'd registered & run around in my 7 for a few months using the standard short 4-1 and catalytic exhaust. When I upgraded to the 4-2-1 it felt like another step up in performance despite still being wowed by the zip of a 7. Bang for buck I couldn't fault it.
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