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OK. Stupid question time....
What is the 7A exhaust cam, why is it better than the ABY one, and how easy is it to fit? Also is it an essential upgrade for my ABY if replacing the turbo to an RS2 stage 3, RS2 injectors and RS2 e/m?
Cheers guys
Karl
Oct 93 build MY 94 ABY Kingfisher Blue Audi S2 with MD147 turbo :mischeif:u SOLD
Audi 90 Quattro 20V 1989 7A
Audi TTRS 2010 APR stage 2 +
Triumph 675 Street Triple R
It has higher lift than the stock s2 cam, so opens the valve for longer, i think its pretty much the same as the RS2 ex cam, but a lot cheaper,
It helps with top end power, i have one fitted, along with RS2 bits, but fitted everything at the same time so didnt notice what differenct a cam alone will make.
You can fit the inlet cam from the 7a also.
It has higher lift than the stock s2 cam, so opens the valve for longer, i think its pretty much the same as the RS2 ex cam, but a lot cheaper,
It helps with top end power, i have one fitted, along with RS2 bits, but fitted everything at the same time so didnt notice what differenct a cam alone will make.
You can fit the inlet cam from the 7a also.
martin
Thanks for the reply Martin....Anyone know how much they cost????
Can we get them through VAGPARTS??
Cheers
Oct 93 build MY 94 ABY Kingfisher Blue Audi S2 with MD147 turbo :mischeif:u SOLD
Audi 90 Quattro 20V 1989 7A
Audi TTRS 2010 APR stage 2 +
Triumph 675 Street Triple R
Compare the to over laps between the cams- not good on a turbo car you loose loads of torque, unless you are going for a all out comp car you will destory the driveabilty and fuel econ.
I don't think there is any overlap on any of these cams.
Is that right?
There is always overlap on all engines, single or twin cam, its when both valve are open at the same time between the exhaust stroke and the inlet stoke.
Also NA cams have to much duration this to to promote scavenging of the cyl and is more important on NA than turbos.
Don't worry. I had a moment then.
Got my ATDC mixed with my BTDC!
D!ckhead!
OK! So for Mr Thicky here, can you repeat the correct ones please
Oct 93 build MY 94 ABY Kingfisher Blue Audi S2 with MD147 turbo :mischeif:u SOLD
Audi 90 Quattro 20V 1989 7A
Audi TTRS 2010 APR stage 2 +
Triumph 675 Street Triple R
Actually, the figures i have for the 3B cams show the exhaust closes at 9° BTDC and the inlet opens at 3° BTDC. Can anyone confirm this? 6° with both sets of valves shut. That would be a small compression just before the intake stroke.
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