Cosworth 2.5L STi camshafts...

dsupermansti · 01-19-2006, 05:12 PM

Anyone here had any experience with these or have heard anything about them?
Found them here and thought they seemed interesting. Haven't really heard of any cams for the STi's EJ25
http://www.vividracing.com/catalog/p...ducts_id/19133

***Neanderthal Racing*** · 01-19-2006, 05:47 PM

theyre not ready yet as i understand it. also, those are not acvs cams as far as i can tell. the only acvs cams currently available that i know about are crower and dpr. i have a dpr stage 3 coming.

dsupermansti · 01-19-2006, 05:53 PM

Sorry for sounding like a total noob , but what is an acvs cam? Stock idle/rough idle maybe?

***Neanderthal Racing*** · 01-19-2006, 06:04 PM

sorry. i meant avcs.

avcs = active valve control system.

the stock sti cams are hydraulically actuated to change the cams' position above a certain rpm, i believe 4,000 rpm. this lets the car breathe better higher in the rpm band without sacrificing low and mid range power. you give that up by not going to an avcs cam. it also requires some other modifications in order to make a non avcs cam compatible with our motor.

**evilSTi7** · 01-19-2006, 06:04 PM

avcs is subaru's form of vtec (or close to it). the sti cams come stock with it, so i would think if you got new cams you would want to keep it.

dsupermansti · 01-19-2006, 07:32 PM

So what cams operate like the stocks with the advantage of more power? Any?

***Neanderthal Racing*** · 01-19-2006, 07:38 PM

i answered that question a few posts up; crower and dpr. a search on nasioc will give you a number of threads on the subject.

you'll find dpr cams here. usdm sti avcs cams are mid page.
http://store.dprracing.com/cams/subaru/dprbillet.htm

STI5150 · 01-19-2006, 08:02 PM

I think JUN makes cams for the sti aswell...pricey as hell.

***Neanderthal Racing*** · 01-19-2006, 08:04 PM

the juns are not avcs unless they released one recently.

Illusive · 01-19-2006, 09:41 PM

Quote:

Originally Posted by evilSTi7

avcs is subaru's form of vtec (or close to it). the sti cams come stock with it, so i would think if you got new cams you would want to keep it.

avcs is nothing like vtec.

the old versions of vtec only had variable lift duration cams.

subaru's avcs is more simmilar to I-vtec system, just without variable lift. and identical to toyotas vvt (variable valve timing) found on most of the newer model toyotas.

how do i know its the same as toyotas vvt? they use the exact same denso parts, the vvt actuator on the end of the cam sprokets are the same design, and the oil control valve for avcs is the same unit in the toyota. hell we even use the same maf.....

zedman86 · 01-20-2006, 06:05 AM

i dont know anything about cams but i do know this, you should probably stay away from vivid racing.

**evilSTi7** · 01-20-2006, 06:59 AM

Quote:

Originally Posted by Illusive

avcs is nothing like vtec.

the old versions of vtec only had variable lift duration cams.

subaru's avcs is more simmilar to I-vtec system, just without variable lift. and identical to toyotas vvt (variable valve timing) found on most of the newer model toyotas.

how do i know its the same as toyotas vvt? they use the exact same denso parts, the vvt actuator on the end of the cam sprokets are the same design, and the oil control valve for avcs is the same unit in the toyota. hell we even use the same maf.....

so if i add the I will you be happy?

sebtarta · 01-20-2006, 07:55 AM

Quote:

Originally Posted by evilSTi7

so if i add the I will you be happy?

But yeah Toyota and Subaru share their parts....its a big family

***Neanderthal Racing*** · 01-20-2006, 08:01 AM

i don't know about two guys "swordfighting" (if you get my drift).

2FastCars · 01-20-2006, 09:42 AM

The Cosworth stage 1 cams have avcs and are available for the USDM STi. The reason I know is because I will be running the cosworth stage 1 cams in my STi. I ordered these about 1 week ago, and they will be arriving sometime next week (pictures will be in my journal on this forum). The stage 1 cams are perfect for the street and will make more power throughout the power band, as well as help with spool up time. These do not cause a lumpy idle, and the car will drive like stock...except with more power. If you give me a couple of weeks, to install them (and break in the motor) and have the car tuned, I will give you my impressions of them on my car.

If your looking for a good place to purchase the cams, or need to know more information about them go to:

http://www.automasterofwestchester.com/pistrodcams.htm

01-19-2006, 05:12 PM	#1
dsupermansti Grassroots STI Racer Car: 06 AW STI Fav Mod: WRX trunk Location: In my house Posts: 530 Join Date: Nov 2005 Trader Rating: (1)	Cosworth 2.5L STi camshafts... Anyone here had any experience with these or have heard anything about them? Found them here and thought they seemed interesting. Haven't really heard of any cams for the STi's EJ25 http://www.vividracing.com/catalog/p...ducts_id/19133 This ad is not endorsed by this member. Please register or login to hide this ad.

01-19-2006, 06:04 PM	#4
*Neanderthal Racing* GT R US Car: CUTN EDG project Fav Mod: $20. mudflaps from auto zone Location: my cave Posts: 5,827 Join Date: Dec 2003 Trader Rating: (1)	sorry. i meant avcs. avcs = active valve control system. the stock sti cams are hydraulically actuated to change the cams' position above a certain rpm, i believe 4,000 rpm. this lets the car breathe better higher in the rpm band without sacrificing low and mid range power. you give that up by not going to an avcs cam. it also requires some other modifications in order to make a non avcs cam compatible with our motor. Last edited by Neanderthal Racing : 01-19-2006 at 06:16 PM.

01-20-2006, 09:42 AM	#15
2FastCars Professional STI Driver Car: 04 Subaru STi Fav Mod: AMR Pro-Street block, Cosworth Cams, Race heads, BIG turbo!! Location: Danbury, CT Posts: 424 Join Date: May 2004 Trader Rating: (0)	The Cosworth stage 1 cams have avcs and are available for the USDM STi. The reason I know is because I will be running the cosworth stage 1 cams in my STi. I ordered these about 1 week ago, and they will be arriving sometime next week (pictures will be in my journal on this forum). The stage 1 cams are perfect for the street and will make more power throughout the power band, as well as help with spool up time. These do not cause a lumpy idle, and the car will drive like stock...except with more power. If you give me a couple of weeks, to install them (and break in the motor) and have the car tuned, I will give you my impressions of them on my car. If your looking for a good place to purchase the cams, or need to know more information about them go to: http://www.automasterofwestchester.com/pistrodcams.htm This ad is not endorsed by this member. Please register or login to hide this ad.

01-19-2006, 05:47 PM	#2
*Neanderthal Racing* GT R US Car: CUTN EDG project Fav Mod: $20. mudflaps from auto zone Location: my cave Posts: 5,827 Join Date: Dec 2003 Trader Rating: (1)	theyre not ready yet as i understand it. also, those are not acvs cams as far as i can tell. the only acvs cams currently available that i know about are crower and dpr. i have a dpr stage 3 coming.

01-19-2006, 05:53 PM	#3
dsupermansti Grassroots STI Racer Car: 06 AW STI Fav Mod: WRX trunk Location: In my house Posts: 530 Join Date: Nov 2005 Trader Rating: (1)	Sorry for sounding like a total noob , but what is an acvs cam? Stock idle/rough idle maybe?

01-19-2006, 06:04 PM	#5
evilSTi7 The Hoff Fan Club, member #001 Car: 05 WRB/Gold Fav Mod: Hood Scoop Homer Location: Where ever The Hoff is! Posts: 10,259 Join Date: Jul 2004 Trader Rating: (4)	avcs is subaru's form of vtec (or close to it). the sti cams come stock with it, so i would think if you got new cams you would want to keep it.

01-19-2006, 07:32 PM	#6
dsupermansti Grassroots STI Racer Car: 06 AW STI Fav Mod: WRX trunk Location: In my house Posts: 530 Join Date: Nov 2005 Trader Rating: (1)	So what cams operate like the stocks with the advantage of more power? Any?

01-19-2006, 07:38 PM	#7
*Neanderthal Racing* GT R US Car: CUTN EDG project Fav Mod: $20. mudflaps from auto zone Location: my cave Posts: 5,827 Join Date: Dec 2003 Trader Rating: (1)	i answered that question a few posts up; crower and dpr. a search on nasioc will give you a number of threads on the subject. you'll find dpr cams here. usdm sti avcs cams are mid page. http://store.dprracing.com/cams/subaru/dprbillet.htm

01-19-2006, 08:02 PM	#8
STI5150 STI Driver Car: 2005 STI Location: RGV Texas Posts: 215 Join Date: Jun 2005 Trader Rating: (3)	I think JUN makes cams for the sti aswell...pricey as hell.

01-19-2006, 08:04 PM	#9
*Neanderthal Racing* GT R US Car: CUTN EDG project Fav Mod: $20. mudflaps from auto zone Location: my cave Posts: 5,827 Join Date: Dec 2003 Trader Rating: (1)	the juns are not avcs unless they released one recently.

01-20-2006, 06:05 AM	#11
zedman86 Professional STI Racer Car: 07 xterra Location: San Francisco Posts: 700 Join Date: Aug 2005 Trader Rating: (2)	i dont know anything about cams but i do know this, you should probably stay away from vivid racing.

01-20-2006, 08:01 AM	#14
*Neanderthal Racing* GT R US Car: CUTN EDG project Fav Mod: $20. mudflaps from auto zone Location: my cave Posts: 5,827 Join Date: Dec 2003 Trader Rating: (1)	i don't know about two guys "swordfighting" (if you get my drift).