F20C Before-After Dyno with BC2 Cams & PPR Motorsports Headwork
Joined: Apr 2009
Posts: 2,629
Likes: 42
From: Windsor, CA
Originally Posted by thomsbrain' timestamp='1364848184' post='22443898
Way too much weird stuff going on with this car to get any useful data from it. Pulling intake air from two different pressure zones on the car? Car clearly not running properly at low RPM? Unknown headwork? 
About the intake, you may be right. This is what we also thought. So we decided to close one of the bores feeding the intake filter box to see the difference. Will do it soon.
About the headwork, I cannot share the pics unfortunately due to some privacy reasons of PPR Motorsport; however I can give two hints about the headwork
1-) ports are angeled. 2-) inside of the ports are coated 
And I think I have the velocity and cfm before - after graphs of the headwork somewhere. Will post them once I find them.
What I mean in terms of useful data is that your car seems to have some running issues that are not due to the cams and it has headwork that other owners will not have/will not be able to reproduce. So you have confounding variables that make it hard to say what effect the cams have on normal cars. Therefore it would be hard for potential cam shoppers to get anything useful out of your experience with the cams.
My own BC experience isn't a straight A/B test, either, so it is also limited in usefulness for others. When I swapped cams, I also went back from a 70 mm Ti single exhaust to a dented stock exhaust. On my old setup (stock cams and 70mm single exhaust), I made 222 HP tuned. On my new setup (BC cams, stock exhaust), I made 226 HP tuned. Both were with the stock cat and everything else identical. With BC cams and stock exhaust, I made slightly less mid-range power (to be expected because the exhaust had excellent mid-range gains), but the cams more than made up for the loss of the nice exhaust for top-end power. For me, they were a great addition because I make more power than before and no extra noise. What would the cams have made with the original 70mm exhaust? I don't know, so I don't know how much actual potential they have. All I know is they were a worthwhile upgrade for my situation. $ per peak horsepower, they are probably the cheapest power upgrade for our cars, short of forced induction.
Joined: Apr 2009
Posts: 2,629
Likes: 42
From: Windsor, CA
Originally Posted by rus21s' timestamp='1365734713' post='22468538
ok so then i should upgrade the ECU first? They say on the BC website gain 13hp over stock and on the dyno graph it is using the stock ECU.
Considering Haltech for the AP1
Considering Haltech for the AP1
Thread Starter
Registered User
Joined: Apr 2012
Posts: 65
Likes: 0
Registered User
Joined: Mar 2009
Posts: 3,026
Likes: 10
From: Israel
If the engine is running and tuned properly, you should not be having issues at low RPM. I have my BC cams installed and tuned now and the engine idles perfectly and makes decent power in low RPMS. The biggest difference is it simply makes more power up top than it did on stock cams.
already had intake, full exhaust and flashpro tune.
retune made them feel even better.
no noises and no idle problems
Thread
Thread Starter
Forum
Replies
Last Post