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can i tune this ???

just wondered if its worth polishing the insides of the inlet plenum ?? and will it make any difference ?? cheers guys
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Originally Posted by icemancube View Post
just wondered if its worth polishing the insides of the inlet plenum ?? and will it make any difference ?? cheers guys
You could probably clear off any of the casting markes but i dont think it will make any difference at all.
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Originally Posted by BADfish10 View Post
You could probably clear off any of the casting markes but i dont think it will make any difference at all.
Polishing won't hurt, but the improvement will not be noticeable. You can round off the ports

The Busso inlet plemun is designed originally for the 2.5 V6 - it's volume is 2.5L. If you want to enhance it - cut the backside (read edge closest to cabin) off and increase the volume by extending the plenum in its width. If you want to be exact - extend it in a slight tapered shape

Last edited by Gertie; 23-08-12 at 06:49.
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Polishing won't hurt, but the improvement will not be noticeable. You can round off the ports

The Busso inlet plemun is designed originally for the 2.5 V6 - it's volume is 2.5L. If you want to enhance it - cut the backside (read edge closest to cabin) off and increase the volume by extending the plenum in its width. If you want to be exact - extend it in a slight tapered shape
is the gta plenum any different then ??
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is the gta plenum any different then ??
No all the same fella, I think the throttle body is bigger though although still arguably undersized.
Check the gta lounge as they are having a carbon fiber one with trumpets made. J
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No all the same fella, I think the throttle body is bigger though although still arguably undersized.
Check the gta lounge as they are having a carbon fiber one with trumpets made. J
No, even TB's is VERY similar
https://www.alfaowner.com/Forum/tunin...-new-post.html
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Yes it is only the script on it that's different.
There are physical changes to the outside between Euro 1, 2 & 3 but the internal is basically the same.
Only the 166 plenum is really different from the rest.

I cleaned up the inside of my GTV's plenum and apart from the satisfaction of doing it i doubt if it really made a change to the performance.





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Yes it is only the script on it that's different.
There are physical changes to the outside between Euro 1, 2 & 3 but the internal is basically the same.
Only the 166 plenum is really different from the rest.

I cleaned up the inside of my GTV's plenum and apart from the satisfaction of doing it i doubt if it really made a change to the performance.





Nice one. Cheers does the plenum get to hot being near the exhaust manifold? Cheers again
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It gets hot but there's not a lot you can do about that.
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It gets hot but there's not a lot you can do about that.
A little bit of NOS cools things down nicely...
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That's true
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yea well nos it is as this is what is being fitted
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could i not deflect any heat away from the plenum ??
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Yes you can add isolation material to the bottom and back of the plenum but i do not really know if it will help a lot.
If you want to start something like that you will end up wrapping the inlet runners as well.
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Yes you can add isolation material to the bottom and back of the plenum but i do not really know if it will help a lot.
If you want to start something like that you will end up wrapping the inlet runners as well.
so will the heat really slow me down that much ?? i just know what my car like is in the summer it is really noticeable .. power decrease .
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No i do not think you will notice the difference.
It will probably be 0.000001hp
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Indeed I think for every 10-11 degrees Fahrenheit in temperture you loose 1% of the total horsepower.
It a rough equation but you can get more information if you google it.
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Indeed I think for every 10-11 degrees Fahrenheit in temperture you loose 1% of the total horsepower.
It a rough equation but you can get more information if you google it.
mate some times i work till like 3 or 4 in morning and when that air is cold a dense v6 goes like stink very noticeable prob get a light weight bonnet and scoop plus wrap the manifold i reckon keep the under hood temp down ..
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Don't ruin the looks though!

It does all help but there's usually better ways to make power than the odd tweaking. But then again it's how far do you want to take something.
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Don't ruin the looks though!

It does all help but there's usually better ways to make power than the odd tweaking. But then again it's how far do you want to take something.
well im strapping nos to her mate having cambelt 3.2 inlet cams and fly wheel and clutch goin in too
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well im strapping nos to her mate having cambelt 3.2 inlet cams and fly wheel and clutch goin in too
You got a Q2 or Quaife diff yet mate?
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You got a Q2 or Quaife diff yet mate?
not yet buddy hoping to square u up for the ecu when i come down hopin my car be complete by weekend my mate had alot work on hes doin alot work dropping engine out and gear box doin all big jobs then fitting my rear powerflexed suspension and last but not least the NOS
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