Forced Induction Supercharger/Turbocharger

Passed smog again!

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Old Jun 2, 2006 | 08:53 PM
  #1  
EDS Z28's Avatar
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From: Southern CA
Passed smog again!

Hey guys, just FYI, since this is the blower forum. The parts used are in my signature. I cleaned the t-body and MAF before I went in. It seemed to run smoother than ever. I had to go to 3 places to smog it, the first 2 guys didn't want to touch it.

Here are the numbers:
@15 mph: HC = 27 (max=83)
CO% = .03 (max = .48)
NO = 236 (max = 689)

@25 mph: HC = 27 (max=48)
CO% = .03 (max =.46)
NO = 243 (max = 706)

Oh yeah, I forgot to mention, it's basically a stock tune except for the increased idle speed, fans come on earlier (around 190 deg), and modified injector constant to compensate for the bigger injectors. So if anybody doubts this cam to pass, I've laid that to rest.
Old Jun 3, 2006 | 09:06 AM
  #2  
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Re: Passed smog again!

Are those HC numbers a percentage or PPM? I typically score lower HC with the fans at stock temp, fuel burns off in headers.
Old Jun 3, 2006 | 10:23 AM
  #3  
EDS Z28's Avatar
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Re: Passed smog again!

The HC's are ppm. Those numbers could possibly be a little lower if the fans were set to the stock temperature settings.
Old Jun 3, 2006 | 11:09 AM
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Re: Passed smog again!

Ed, Is that your everyday tune you passed with? My cam is a 228/236 and I had to try about 8 different tunes and finally lock my blm's to pass also here in CA, As soon as I passed I switched back to my daily driver tune. My car also runs great normally but maybe a little on the rich side.
Old Jun 3, 2006 | 06:24 PM
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Re: Passed smog again!

What size injectors do you have?
Old Jun 3, 2006 | 09:13 PM
  #6  
EDS Z28's Avatar
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From: Southern CA
Re: Passed smog again!

Yes, it's my everyday tune I've been running for about 4 years now. I haven't had much time to tinker around with the car lately, more of my time has been put towards my house...

Does your 228/236 cam have a 112 or 114 lsa? If it is 112, that would probably explain the difficulty you had in passing it. Another factor is valve overlap. I picked my cam not only because it matches well with the supercharger, but has very little overlap (I think 2 degrees). The grind is spec'd from Combination Motorsports, it's the popular Comp cams XE 224/236 at 114 lsa, standard lift version. You know, your extra 4 degrees on the intake is significant. That may have put you over the edge.

I've been using 42 lb svo injectors for years now, they run great.
Old Jun 3, 2006 | 11:12 PM
  #7  
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Re: Passed smog again!

I have gotten as low as 59 on the HC, man those are some great numbers. We have the idle only test and we set the idle around 875-900
Old Jun 4, 2006 | 01:28 PM
  #8  
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Re: Passed smog again!

Originally Posted by EDS Z28
Yes, it's my everyday tune I've been running for about 4 years now. I haven't had much time to tinker around with the car lately, more of my time has been put towards my house...

Does your 228/236 cam have a 112 or 114 lsa? If it is 112, that would probably explain the difficulty you had in passing it. Another factor is valve overlap. I picked my cam not only because it matches well with the supercharger, but has very little overlap (I think 2 degrees). The grind is spec'd from Combination Motorsports, it's the popular Comp cams XE 224/236 at 114 lsa, standard lift version. You know, your extra 4 degrees on the intake is significant. That may have put you over the edge.

I've been using 42 lb svo injectors for years now, they run great.
I had mine custom ground from Bullet for my motor, It's a 113 lsa. My not passing smog had more to do with running rich do to my tune than anything else I think. Now that I have my smog tune I shouldn't have any more trouble getting past the smog ****'s
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