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Author Top Hat
MikeH
Member
Registered: 3rd Apr 03
User status: Offline
8th Mar 04 at 21:10   View User's Profile U2U Member Reply With Quote
1.2 16v

I'm toying with the idea of replacing the air intake from the throttle body back to the induction kit.

Would replace the whole 'top hat' plastic thing (with the 3 bolts in it) with a staright bit of pipe, would just have to connect it to the air mass meter.

The tricky bit is making a connection to screw down onto the throttle body.

Thoughts?
miles
Member
Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
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8th Mar 04 at 21:16   View User's Profile U2U Member Reply With Quote
Got a pic of the design of it? If its the same as the spi ones then the design is fairly simple and probably effective.

Do you want to do it for performance gains or looks?
MikeH
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Registered: 3rd Apr 03
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8th Mar 04 at 21:23   View User's Profile U2U Member Reply With Quote
It looks a bit like the spi one, slightly different.

Was thinking of doing it for cheep performance. (a bit anyway)
miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
User status: Offline
8th Mar 04 at 21:24   View User's Profile U2U Member Reply With Quote
The volume of the top hat will play a part in the performance. Whether modifying that or the pipe will gain performance who knows.
MikeH
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Registered: 3rd Apr 03
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8th Mar 04 at 21:28   View User's Profile U2U Member Reply With Quote
Will probably move the power band and change the resonant frequency of the inlet.
miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
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8th Mar 04 at 21:39   View User's Profile U2U Member Reply With Quote
I would have thought it would play more of a part with the torque.
MikeH
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Registered: 3rd Apr 03
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8th Mar 04 at 21:43   View User's Profile U2U Member Reply With Quote
I have a problem with the car to fix first, loosing power when you try and pull off...

But if i manage to fix that i'll then feel more entheusiastic and i might have a go at this.

Need to make some sort of flange with 3 holes in it that will then connect to the new pipe.

I should do some calculations about the induction length and decide on the best length....

(I'm a mechanical engineering uni student, i *should* know how to do it, but i don;t )
miles
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Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
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8th Mar 04 at 22:04   View User's Profile U2U Member Reply With Quote
I 'think' about 350mm was right for mine.
MikeH
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Registered: 3rd Apr 03
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8th Mar 04 at 22:07   View User's Profile U2U Member Reply With Quote
Oh you've done this before then?

How did you connect it to the body?
miles
Member
Registered: 25th Mar 02
Location: plymouth Drives: Astra Sport
User status: Offline
8th Mar 04 at 22:33   View User's Profile U2U Member Reply With Quote
I worked it out for the length of my trumpets, but bulk head clearance got in the way.....

 
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