Our New Cam Kits, Compare The Value!!! (free limited time offer inside)
03-11-2003, 10:32 PM
#46
Registered User
Join Date: Oct 2002
Location: Orange Kounty, Kalifornia
Posts: 2,277
Krause and I were researching the smog issue in months past. Sorry I haven't been around, I finally got my computer back.
The trick to pass smog lies in the amount of overlap in the cam. Hotcams can pass easy. The 224/230 has about 53* of overlap which also can pass with a computer tune. Any cam "should" have a computer tune to bring out it's best.
Also, the heads and the low lift flow will also affect the amount of overlap scavenging that can increase HydroCarbons. Also, add in an CAI and good headers/cat-back, then you will also increase the scavenging and HCs. It is possible in Cali to pass smog, but you should have your computer tuned.
If the twin turbo set-up by Banks or Turbolocity don't pan out by Summer, then I too will be jumping on the N/A set-up. While everything is apart, just get the heads cleaned up and if you can get them ported... do it!
Remember, the cam is just the "brains" of the entire intake, compression, and exhaust flow of the engine and each bolt on will affect the characteristics.
I also read about the stock timing chain, just save and upgrade with the LT4 timing chain or something more durable than stock. You will be increasing the power output and will fatigue the stock set up by pushing it's strength to the threshold. You won't be happy when the chain slips and smacks a valve trashing your heads and pistons.
The trick to pass smog lies in the amount of overlap in the cam. Hotcams can pass easy. The 224/230 has about 53* of overlap which also can pass with a computer tune. Any cam "should" have a computer tune to bring out it's best.
Also, the heads and the low lift flow will also affect the amount of overlap scavenging that can increase HydroCarbons. Also, add in an CAI and good headers/cat-back, then you will also increase the scavenging and HCs. It is possible in Cali to pass smog, but you should have your computer tuned.
If the twin turbo set-up by Banks or Turbolocity don't pan out by Summer, then I too will be jumping on the N/A set-up. While everything is apart, just get the heads cleaned up and if you can get them ported... do it!
Remember, the cam is just the "brains" of the entire intake, compression, and exhaust flow of the engine and each bolt on will affect the characteristics.
I also read about the stock timing chain, just save and upgrade with the LT4 timing chain or something more durable than stock. You will be increasing the power output and will fatigue the stock set up by pushing it's strength to the threshold. You won't be happy when the chain slips and smacks a valve trashing your heads and pistons.
03-11-2003, 11:28 PM
#47
Registered User
Join Date: Jan 2003
Location: Greenville, SC
Posts: 1,217
So with a basic pcmforless tune, the 224/230 with shorty headers, catback and exhaust shoudl pass emissions?? How does the 218/224 compare to the Hotcam, is it bigger, more aggresive?? Sorry for all the questions, but with the cramped Z28 engine bay, I only want to do this once and be emissions hassels free.
03-12-2003, 01:05 AM
#48
Registered User
Join Date: Oct 2002
Location: Orange Kounty, Kalifornia
Posts: 2,277
The 218/224 is very close to the hotcam... at that point the hot cam kit is a better value. You won't get much performance with the extra 4* duration. They usually hang the exhaust open for longer due to restrictive exhausts. Sounds like you're set to go with your set-up.
The 224/230 is about the limit with a good tune in Cali for smog. Technically, only CARB approved products can be permitted. Crane offers one with good lift.
It's good that you are doing research before you jump in. This is something you only want to do once as you said.
Don't forget the timing chain and all of the seals and gaskets.
The 224/230 is about the limit with a good tune in Cali for smog. Technically, only CARB approved products can be permitted. Crane offers one with good lift.
It's good that you are doing research before you jump in. This is something you only want to do once as you said.
Don't forget the timing chain and all of the seals and gaskets.
03-13-2003, 03:15 PM
#53
Registered User
Join Date: Oct 2002
Location: Orange Kounty, Kalifornia
Posts: 2,277
Krause could answer that... but typically, the wider the LSA the smoother the idle. Yes, you may lose 3-8 HP at the top RPM (depends on heads, rocker ratio, CAI, Cat-Back, Headers, etc) but you will get a much smoother idle.
Also, the wider LSA reduces overlap... too much overlap can drop raw fuel down the exhaust registering has high HC on the smog machine.
That's the trade off...
You can offset that a bit with 1.6 RRs on the intake valve and 1.5 RRs on the exhaust. But again, the wider LSA makes the car more "driveable".
The narrow LSA will get you more power and for many can still be driven on the street. It will increase overlap and smog HC will rise.
Again, the cam just helps the engine maximize the other components mentioned above. May want to read David Vizards book on cams... it is pretty good.
Also, the wider LSA reduces overlap... too much overlap can drop raw fuel down the exhaust registering has high HC on the smog machine.
That's the trade off...
You can offset that a bit with 1.6 RRs on the intake valve and 1.5 RRs on the exhaust. But again, the wider LSA makes the car more "driveable".
The narrow LSA will get you more power and for many can still be driven on the street. It will increase overlap and smog HC will rise.
Again, the cam just helps the engine maximize the other components mentioned above. May want to read David Vizards book on cams... it is pretty good.
03-19-2003, 06:26 AM
#55
Registered User
Join Date: Apr 2002
Location: sebewaing, mi
Posts: 1,309
i ordered my kit yesterday and can't wait!!!
i got the 224/236 cam, sooner or later shes gonna see some nitrous or boost so might as well set it up now
seth is awesome!!!! some of the best customer service i've had in a long time!!
you guys are awesome, maybe next year an awesome price on a supercharger kit maybe GP???
worth a shot anyway!
i got the 224/236 cam, sooner or later shes gonna see some nitrous or boost so might as well set it up now
seth is awesome!!!! some of the best customer service i've had in a long time!!
you guys are awesome, maybe next year an awesome price on a supercharger kit maybe GP??? worth a shot anyway!
04-07-2003, 12:45 AM
#59
Registered User
Join Date: Feb 2003
Location: NE philadelphia pa, FOX CHASE
Posts: 236
I want a cam setup in my z28 so please help me in picking one
I know nothing about them
i want to pass my pa em. test smog or whatever
i really don't want cam surge don't know what it is really but i don't want it
i want to get a kit with all parts needed
I know nothing about them
i want to pass my pa em. test smog or whatever
i really don't want cam surge don't know what it is really but i don't want it
i want to get a kit with all parts needed
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