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Old 12-28-2005, 11:53 PM   #1
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Default pre series intake or early tunned port intake best for turbo

Ok I'm switching my fiero conversion over from SC to a turbo set up and i'm woundering wich intake you guys think would be better suited to a turbo set up. The early 88-90 na intake or the early 90'* aluminum tuned port intake. My thinking is that the tuned port intake makes better lower end wich i won't really need in the fiero. The earlier intake has a large plennum and short runners wich should make it perfect for a turbo set up, but i duno a whole lot about either intake hense this post. also will my SC TB bolt onto either of these and if not wich would be the best to use Thanks in advance.
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Old 12-29-2005, 01:08 AM   #2
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Why not just gut the */c and use that as the manifold? IMHO it will be a better choice than either of the others. From air flow testing I am doing on a '90 3800 LN3 (turbocharged), the flow is not very well balanced inside a normal n/a manifold due to the air entry on the end, which piles up on the opposite end, and leans the cylinders opposite the inlet end. Force feeding exagerates this effect. I am actually considering looking for a junk */c, or at least the lower section and fuel rail, to make a custom upper plenum. Just my $.02
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Old 12-29-2005, 02:53 AM   #3
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You might want to check out the latest issue of GM High Tech Performance, theres an article in there about a turbo kitf or the 3.8 (04-05 GP in the article). For their kit, they used a gutted M90 for the intake.
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Old 12-29-2005, 12:35 PM   #4
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well 2 to zip for the gutted SC wich wasn't even an option i thought of.
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Old 12-29-2005, 05:37 PM   #5
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With the Cartuning L67 turbo kit they use a block off plate and take off the snout and rotors. I think that will be your best bet other then a complete custom intake so you can take advantage of the larger '94-'95 L67 TB.
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Old 12-29-2005, 11:45 PM   #6
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Thats was one of my other questions. Just from looking around at the yard im thinkin my SC TB will bolt to the 88-90 intake although i haven't compared them side by side.
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Old 12-30-2005, 11:25 AM   #7
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Quote:
Originally Posted by 2seater
..... From air flow testing I am doing on a '90 3800 LN3 (turbocharged), the flow is not very well balanced inside a normal n/a manifold due to the air entry on the end, which piles up on the opposite end, and leans the cylinders opposite the inlet end. Force feeding exagerates this effect. I am actually considering looking for a junk */c, or at least the lower section and fuel rail, to make a custom upper plenum. Just my $.02
you have me Intrigued!
flow test'* with the intake bolted to the heads?
I wish to know more about your test numbers/conditions,
and any other info on this topic i can use it in some of my modeling work
Got a link?

[/end thread hijack]

Regards, James
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Old 12-30-2005, 01:48 PM   #8
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Quote:
Originally Posted by markviiisvt4
Thats was one of my other questions. Just from looking around at the yard im thinkin my SC TB will bolt to the 88-90 intake although i haven't compared them side by side.
What year is the TB coming from? A '92-'93 TB will bolt to it and a '94-'95 will be too big.
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Old 12-31-2005, 12:54 PM   #9
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The TB is off a 94 and i have decided to use the TP intake to help my bottom end and help the boost transition. Since it'* going in a fiero i dont' waht the boost to be on and off so to speak.
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Old 12-31-2005, 05:23 PM   #10
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Then you will have to use the '92-'93 L27/L67 TB or a '94-'95 L27 TB. It is a smaller bore but that is not that important on a turbo setup.
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