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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 04-02-2008, 07:43 PM   #1
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air fuel ratios?

Does anybody know what effect the N/A intake manifold has on a/f ratios when running on stock software for a turbo? I would think that it would run lean in lowish to mid RPM's and then rich in high RPM's but I am still curious because I am getting one though the post for postage costs plus a parts trade.
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Old 04-02-2008, 07:45 PM   #2
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If there's a change at all, it should be taken care of by adaption.
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Old 04-02-2008, 07:52 PM   #3
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I hope you are correct but I think the change in VE may very well be too much for trionic to deal with. I think maybe a 3.5 bar fuel pressure regulater may keep me from running lean, but at the same time it could very well make the car too rich to get any added bennifit. Plus added fuel consuption.
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Old 04-02-2008, 08:20 PM   #4
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T5 can adapt 25 percent in both directions, not to mention 25% from that when the o2 sensor kicks in.
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Old 04-03-2008, 08:39 AM   #5
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It is not gonna add that much more air to make a difference.
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Old 04-03-2008, 02:17 PM   #6
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If it isn't going to fuck stuff up then why don't more people do it? It is worth a good midrange torque boost. Nick got like 20% more torque on his NIRA car, of coarse he tuned for it so I know my increase won't be as dramatic.
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Old 04-04-2008, 06:58 PM   #7
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Bueler? I kind of would like an answer to that question.
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Old 04-04-2008, 07:03 PM   #8
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Because unless you've got a lot of hardware changes and you do a custom tune to make it work with it there isn't any valid gain to make it worthwhile for the trouble to make it fit.

For the money and time spent you could get a better performance gain through bushings and arb to handle stock power even better.



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Old 04-04-2008, 09:02 PM   #9
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Quote:
Originally Posted by NahumCC View Post
Because unless you've got a lot of hardware changes and you do a custom tune to make it work with it there isn't any valid gain to make it worthwhile for the trouble to make it fit.

For the money and time spent you could get a better performance gain through bushings and arb to handle stock power even better.

I love it when people TALK OUT THEIR ASS. HINT HINT have you run one?
The gains are freakin' INSANE down low, but it is a compromise. Your numbers get peaky, 3K revs on an MBC'd car becomes insane, but high end tapers.

Have you noted the volume differences of the two, in hand? Or noticed the different length runners to different cylinders?

Corn, on a stocker with an MBC, I'd want to say you are safe. I ran mine for 3 weeks before going staged tune. One thing I want to note is the fact that you MUST make sure the gasket seals correctly, or you will go my route of housing a valve or two. Gets unfun, quickly.

Mine is also for sale, btw, if yours falls through. (cheap, too, perhaps we can trade). I took mine off because stage 4 software + mbc on an automatic was kinda nuts and I had another intake manifold leak so I wanted to try the turbo manifold on. It drives nicer once you get software.

Buy a new gasket and prepare to spend TIME switching it. Getting to the lower 3 bolts on n/a install is a bitch because the large volume space blocking access..

ALso note, you'll have to drain 1/2 the coolant, and 4-5 ground wires (starter, alternator, fuel rail, manifold itself, and ... I think there is another). The wires for the starter and alternator go down through the runners,so you have no choice but to do this. It's really not a fun job, but not 'hard', either. Just did it again the other day...

Also note gasket orientation when reinstalling; It's close to symetrical but not quite... So, watch that shit CLOSELY or you'll have to do it all over again as you piss coolant everywhere... =)

best luck,
bny
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Old 04-05-2008, 12:23 PM   #10
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Did you ever get it on a dyno? Why did it start leaking again?
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