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Old 03-30-2011, 02:15 PM   #1
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Default 99 intake manifold setup questions

99 head and manifold going on a 94 block in a 90 chassis running ms.

I am thinking the best source for ms and boost meter signal is off the outlet for egr adapted down. I was going to source my vac for the diverter rite after the tb (one of the ones off the neck into the intake mani). I am going to leave the vics disconnected and plug the rest of the ports (vics will be set up after I get the initial bugs out). Does this plan sound like an adequate one or is there a better source for any of these?

I am also swapping my grounding plate over from my 94 head so I have less things to solder.

Any input is greatly appreciated!

Pic of im:
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Old 03-30-2011, 02:26 PM   #2
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fixed: Use 1 for Megasquirt MAP sensor and boost gauge. Use 2 for bov/diverter or w/e else.

Seemed that was the best way to go from my own searching, and also what FM recommends for the 99-00 IM. I'm using mine this way and it's working just fine.

I think the reasoning is, at the back of the manifold, 1 is going to get some turbulence, etc.

Last edited by aaronc7; 03-31-2011 at 01:39 PM.
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Old 03-30-2011, 02:54 PM   #3
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I was thinking two would have turbulence also seeing how it is going through the tb and changing direction at that point. The one that I have capped is rite in the middle of the manifold so I was thinking (like my 94 mani) it would be cleaner air.
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Old 03-30-2011, 02:56 PM   #4
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2 is the worst place for a map line. You want the MAP line on the back of the manifold, not on the front.

Also be careful about what nipple you use - some of them don't actually protrude into the plenum.
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Old 03-30-2011, 03:27 PM   #5
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idk, its working fine for me- heres my reference:

http://flyinmiata.com/support/instru...all_turbos.pdf

page 38, 39. in that file they use 1.) as a MAP line and 2.) as bov line
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Old 03-30-2011, 03:41 PM   #6
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Quote:
Originally Posted by Savington View Post
2 is the worst place for a map line. You want the MAP line on the back of the manifold, not on the front.

Also be careful about what nipple you use - some of them don't actually protrude into the plenum.
So what you are eluding to is the one on the back of the manifold in the plenum would be superior to the one I was thinking about using?


Quote:
Originally Posted by aaronc7 View Post
idk, its working fine for me- heres my reference:

http://flyinmiata.com/support/instru...all_turbos.pdf

page 38, 39. in that file they use 1.) as a MAP line and 2.) as bov line
Looking at pg 39ish it looks like all of the numbers are correct except for the 99-00 manifold which has the bov signal coming from the back and the map coming from the front (it is exactly opposite to every other manifold diagram they list).
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Old 03-30-2011, 03:52 PM   #7
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Originally Posted by Savington View Post
2 is the worst place for a map line. You want the MAP line on the back of the manifold, not on the front.

Also be careful about what nipple you use - some of them don't actually protrude into the plenum.
What's the logic? FM manual says the opposite....
Quote:
"For the MAP sensor, it’s very important to get the cleanest signal possible. Only sealed items with very little fluctuation (e.g, boost gauge, MSD timing box, etc) should share the line with the MAP sensor. Also, it is preferable to have it come into the manifold in the middle. If this is not possible, the front of the manifold is the next best thing. ‘99 - ‘05 cars have a nipple in between two of the runners that looks ideal for sourcing a signal, however, this nipple does not go through to the manifold. Don’t use this to source the signal for anything."
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Old 03-31-2011, 11:08 AM   #8
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Quote:
Originally Posted by Savington View Post
Also be careful about what nipple you use - some of them don't actually protrude into the plenum.
The center nipple (the one with the cover and ziptie in my pic) goes into the plenum. Some of the others don't but it looked like the ones that don't are all in individual runners vs in the plenum.

*Edit: Just got off the phone with FM and they said that I should be taking the signal off the back of the manifold and that the labeling on pg 39 was a misprint...I don't know about the blurb djp posted though. Maybe somebody was high, but I asked about that also and they stated the nipple off the neck that transitions from tb to plenum would not be optimal source for the ecu/boost meter.

Last edited by astroboy; 03-31-2011 at 11:41 AM.
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Old 03-31-2011, 12:47 PM   #9
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Their pictures/description/what they just said on the phone don't all coincide.. ahhh im so confused haha. FWIW I've had no issues with tuning using the front port... I should probably try the other one and see if its any better/worse, but feeling kinda lazy right now
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Old 03-31-2011, 12:56 PM   #10
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Quote:
Originally Posted by aaronc7 View Post
Their pictures/description/what they just said on the phone don't all coincide.. ahhh im so confused haha. FWIW I've had no issues with tuning using the front port... I should probably try the other one and see if its any better/worse, but feeling kinda lazy right now
Well, what did they just say on the phone?
FWIW I source mine from the back of the manifold. The dyno operator sourced it from the front. There was a 1psi difference in boost readings.
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Old 03-31-2011, 12:57 PM   #11
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I am assuming he was referring to this:

Quote:
Originally Posted by astroboy View Post
*Edit: Just got off the phone with FM and they said that I should be taking the signal off the back of the manifold and that the labeling on pg 39 was a misprint...I don't know about the blurb djp posted though. Maybe somebody was high, but I asked about that also and they stated the nipple off the neck that transitions from tb to plenum would not be optimal source for the ecu/boost meter.
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Old 03-31-2011, 12:59 PM   #12
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see astroboy's last post/edit... basically they said that pg 39 was wrong for the 99 IM, and that the rear is actually better (like they show in the pics for the other years). But it still doesn't match the text prior to all the pics (which you quoted). It's starting to seem like the rear would be the way to go since it's that way for all other years, but I guess we won't know for sure unless someone tests it out.
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Old 03-31-2011, 01:05 PM   #13
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You know what's funny.. FM updated their PDF hahahhah. It now has the rear port as the MAP line and one off the TB as bov line. I edited my previous post with pic so theres no confusion for later

I just changed the source for mine, I'll see if I can tell a difference or not.
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Old 03-31-2011, 01:15 PM   #14
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Quote:
Originally Posted by astroboy View Post
I am assuming he was referring to this:
yes sorry, I was all mixed up
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Old 04-01-2011, 12:04 AM   #15
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Thanks for the input guys. I think this caper is solved
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Old 04-01-2011, 12:16 AM   #16
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I swapped ports and I really can't tell a difference, but I'll be leaving it on the rear one.
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Old 04-01-2011, 02:01 PM   #17
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Quote:
Originally Posted by aaronc7 View Post
You know what's funny.. FM updated their PDF hahahhah. It now has the rear port as the MAP line and one off the TB as bov line. I edited my previous post with pic so theres no confusion for later

I just changed the source for mine, I'll see if I can tell a difference or not.
Guess I'll be changing my source too.
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