How does the ATI setup change the stock PCV system? The fresh air intake gets capped?

What about the PCV itself? It remains, correct?

 

TB fresh feed gets capped and valve cover fresh feed gets routed to pre blower.

Problem here is that since ATI leaves the MAF in the stock location, now you have fresh UNMETERED air that makes it's way into the intake manifold through the PCV. Side effect, a nice nasty idle surge if you are using a 112lsa cam. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> (among others)

 

well I am on a 112 and I don't have a problem. All I did is put a check valve inline with my pcv system. So I don't have to worry about the compressor blowing air into my pcv system.
-Jasen

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by SuperSport2000:
<strong>well I am on a 112 and I don't have a problem. All I did is put a check valve inline with my pcv system. So I don't have to worry about the compressor blowing air into my pcv system.
-Jasen</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Forgot to mention the check valve.

Jasen, what do your idle ltrims and cruise ltrims look like? Can you email me a log?

 

Well Jas my Ltrims are all F'ed up. At idle they are around 17% and when driving around they get down to 9%. Before my MAFT my ltrims would stay around 25% =(. i don't have a log with me at this point sorry. When I get my car running again I will send you a log. I am putting on a F1 blower, 12bolt, and dual intank 355 walbro pumps. So when i get all my parts back(next week) I will send you a log. BTW I am think of changing my cam to a 224/232 570/580 113lsa. What do you think about that spec with stock heads?

 

SuperSport2000 - Try relocating your MAF to the inlet side of the blower. Your Ltrims will be right on. They are screwed right now becuase of the unmetered air that JAS talked about.

I went through every scenario I could think of to try and figure out why my Ltrims were so high when I first put my ATI on. They were high enough to set the lean codes in the computer. I switched my MAF to the inlet side of the blower and they went to 0. I just extended the wires on my MAFT to reach down to the fenderwell so I didn't have to cut any factory wires.

It really is the way they should have come from ATI. IMO

John

 

Mellow - You'll get it one of these days. <img border="0" title="" alt="[Razz]" src="gr_tounge.gif" /> <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

<small>[ June 14, 2002, 04:51 PM: Message edited by: XLR8NSS ]</small>

 

Haha... almost $4k for the Fikse's, am on 2nd engine, 2nd tranny, 4th clutch.. Hell...

Gonna pin the crank next week. Walbro too. Just burnt some damn wires, so getting some Taylors and Sleeves.

Gettin' there!

 

XLR I was thinking about putting my MAF to the inlet side of the blower (pullthrough) but then unmetered air would be passing after the compressor. If the MAF is reading the air before the blower it seems I would get false reading after the air is compressed. Hope this makes sense. Wouldn't that cause my fuel mixture to be inproper? Talked to Ed Wright and he also told me to do this. But GWP didn't agree.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by SuperSport2000:
<strong>XLR I was thinking about putting my MAF to the inlet side of the blower (pullthrough) but then unmetered air would be passing after the compressor. If the MAF is reading the air before the blower it seems I would get false reading after the air is compressed. Hope this makes sense. Wouldn't that cause my fuel mixture to be inproper? Talked to Ed Wright and he also told me to do this. But GWP didn't agree.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">There is no unmetered air going into the motor with the pull through method. The blower doesn't "create" extra air on the outlet side.

Example - Pull thru

Say the blower is pulling 50lb/min of air thru the MAF. It is still 50lb/min of air on the outlet side. The thing is the motor cannot flow that much air normally so it creates pressure in the intake. Thats what the blower does. It doesn't make extra air in the intake it just creates pressure in the intake so the motor will flow more air. The MAF will see the same amount of air on either side of the blower.

I hope that made sense. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

BTW, I have talked with Ed and he said the same thing about the pull-thru method. I know Jason doesn't agree with the pull thru method. I've never really talked with him about it though so I'm not sure of his reasons. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

With the pull thru method there is no unmetered air since the fresh air tube for the PCV will now draw in air that has already went thru the MAF.

John <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

 

Cool John thanks for spending the time to explain that to me. After reading that it makes complete sense. I think I am going to move the MAF. Once again thanks for your help.
-Jasen