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Old 04-06-2009, 07:22 PM   #1
Weiss
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Default BC 280 cams

I hear you need a 1K plus idle, and a pain to drive on normal. Anyone have first hand experience? Im stuck between 272 and 280 cams.
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Old 04-06-2009, 08:40 PM   #2
moorebl
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i wonder this too as the BC's are too cheap to pass up compared to others
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Old 04-06-2009, 10:17 PM   #3
godforbid67
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ive got some 280's goin in my car. waiting to get the tranny back from andrewtech though. knuck up how bad can it be? if youve got the power to go along with it youve already got a hard stiff clutch which will probably be the hardest part.
i dont really see why it would be a pain? yeah its going to be a rough idle but thats about it. personally i cant wait for the shaky lopey idle, its what im looking foward to most.
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Old 04-07-2009, 03:05 PM   #4
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Anyone with them in there car with drivine experiance?
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Old 04-07-2009, 06:21 PM   #5
kellygnsd
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I don't have BC 280's but I have Cosworth 275's in my car and can tell you big cams don't like it down low in the RPM band. Its not really that bad and may be exaggerated by my light weight flywheel but if I were to add a unsprung clutch and a huge laggy turbo it would definitely suck. On stock ECU cars the return to idle is somewhat shaky and you don't get the blip-able throttle response you expect at 800-1000 rpm. Its a whole different ball game 4K - 8K though.
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Old 04-07-2009, 10:13 PM   #6
nuppy
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I have BC 280's and my car idles fine at normal rpm. It doesnt have a lope to the idle either.
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Old 04-07-2009, 10:34 PM   #7
CKxx
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Quote:
Originally Posted by nuppy View Post
I have BC 280's and my car idles fine at normal rpm. It doesnt have a lope to the idle either.
That is rather unfortunate.



Slightly Off-Topic, but if you search youtube for "STi 280 cams" (or something like that) there is a sweet video of a Silver STi idling. It sounds absolutely amazing.

EDIT: http://www.youtube.com/watch?v=aNyIAmsX3QU

Last edited by CKxx; 04-08-2009 at 12:54 AM.
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Old 04-07-2009, 11:43 PM   #8
ERICS02WRX
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I have the BC 272 with BC springs, built 2.5, cp pistons, Bc rods, GT30 .82, TGV deletes, 6mt, ACT HD 6 puck and lightweight flywheel, etc.... I have no problems at all with the cams, they idle like the stockers after the car is warm and have great off boost drive ability.
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Old 04-08-2009, 01:45 AM   #9
kellygnsd
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Are you non-STi cam guys with 272 or greater cams idling at the stock 750 rpm or higher?
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Old 04-08-2009, 11:44 AM   #10
godforbid67
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i dont think any aftermarket cams idle at 750 anymore.
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Old 04-08-2009, 01:21 PM   #11
godforbid67
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Quote:
Originally Posted by nuppy View Post
I have BC 280's and my car idles fine at normal rpm. It doesnt have a lope to the idle either.
are you sure?? i dont see how that can be possible. those are pretty big cams and its hard to get them to idle smooth have any videos? what else is done to your motor?
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Old 04-08-2009, 01:34 PM   #12
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STI (avcs) cam gears = smooth idle
WRX (non-avcs) cam gears = lumpy idle
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Old 04-08-2009, 01:44 PM   #13
godforbid67
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yeah but how smooth jay?? i just dont see any cams over 272 idling like stock or too close to stock
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Old 04-08-2009, 02:26 PM   #14
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Well I have the cosworth 278/274 cams, and while my idle is not perfect it's nothing like a cammed motor with WRX cam gears.

Wanting big cams and good idle is like asking for a really big turbo with good spoolup.
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Old 04-08-2009, 09:03 PM   #15
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Quote:
Originally Posted by godforbid67 View Post
are you sure?? i dont see how that can be possible. those are pretty big cams and its hard to get them to idle smooth have any videos? what else is done to your motor?
stock pistons and rods, ap fuel rails, tgv deletes, 280 cams, 20g with 3in inlet and 8cm exhaust, 850 injectors, 12mm oil pump, header/up, catless tbe
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Old 04-08-2009, 10:55 PM   #16
godforbid67
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Quote:
Originally Posted by nuppy View Post
stock pistons and rods, ap fuel rails, tgv deletes, 280 cams, 20g with 3in inlet and 8cm exhaust, 850 injectors, 12mm oil pump, header/up, catless tbe
true, but thats an odd set up. why no pistons or anything??
why a 12mm oil pump and big cams for a turbo thats not so big on the top end? i mean why even do headwork when you have a stock block?? sorry to be off topic just curious.
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Old 04-09-2009, 12:18 AM   #17
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Quote:
Originally Posted by godforbid67 View Post
true, but thats an odd set up. why no pistons or anything??
why a 12mm oil pump and big cams for a turbo thats not so big on the top end? i mean why even do headwork when you have a stock block?? sorry to be off topic just curious.
It's always a good idea to plan for the worst with stock internals, hence the oil pump
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Old 04-09-2009, 01:11 AM   #18
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This is my second 20g. The first one i had i beleive went out from oil starvation so i tapped into one of the blocks oil galleys and stepped the pump up since i had one laying around. stuck with stock interals mostly because of price, but then again people are running some power on stock internals so im not too worried about hurting it. people always complain about their 20g's falling way off but for some reason i havnt really had this problem too much.
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Old 04-09-2009, 01:27 AM   #19
ERICS02WRX
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Quote:
Originally Posted by jays05 View Post
STI (avcs) cam gears = smooth idle
WRX (non-avcs) cam gears = lumpy idle
I am running a 2.5 sti built long block in a wrx with no avcs and BC 272, and it idles just like stock but 100 rpm higher.
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Old 04-09-2009, 01:47 AM   #20
motoryder
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I daily drove my wrx with the BC 280 cams. It was definately lopey and I idled around 1k rpm. If you weren't careful coming to a stop the car would stall every once in a while. That might have had something to do with the tune though.
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Old 04-12-2009, 01:04 AM   #21
godforbid67
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why would it stall when coming to a stop???
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Old 04-12-2009, 02:07 AM   #22
kellygnsd
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The return to idle control is a little flaky with bigasscams on the stock ECU. RPMs have to drop below the set point before idle control begins. Sometimes it picks up too late.
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Old 04-12-2009, 02:33 AM   #23
jigga
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Quote:
Originally Posted by kellygnsd View Post
The return to idle control is a little flaky with bigasscams on the stock ECU. RPMs have to drop below the set point before idle control begins. Sometimes it picks up too late.
not just on stock ECU's, but on standalones also.. Price of fame really..
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Old 04-12-2009, 01:06 PM   #24
godforbid67
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hmmm interesting i didnt know that, ill have to get used to it.
so basically make the drop to idle as short as possible huh?
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Old 04-12-2009, 02:42 PM   #25
berdugo
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Quote:
Originally Posted by kellygnsd View Post
The return to idle control is a little flaky with bigasscams on the stock ECU. RPMs have to drop below the set point before idle control begins. Sometimes it picks up too late.
how big of a cam before it becomes a problem? I heard lots of good things with GSC S2
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