funkyboogalooo

The air intake tubes on my 1984 are tired and need replacing. Has anyone ever done anything other than original equipment to replace them? Somthing that will do the job a little better and look a little different?
Cheers
Mike

SeanR

Roger has some neat ones in stock. He should be back tomorrow from SITM. I don't have any pictures of them so I'm not really any help.

dr bob

There are some Mercedes tubes that are a popular replacement. IIRC they are very inexpensive compared with the 928 tubes with the inverted megaphones. That may be what Roger has available. If so, they are a good fit both in function and appearance.

funkyboogalooo

Thanks both.
Mike

mi928s

Hi mike i put on mine two red hair tubes from autozone they come in different colors.

hope that help Guillermo

RyanPerrella

last time i checked, the OE tubes arent that expensive. I think it was $47 a side or something 2 years ago.

The GTS tubes are $200 plus per side.

mark kibort

what do these look like? pics???

Im using just straight brake ducting tubing from the racer supply store. 3" tubing with metal ribbing. nice and straight. the attachment is a little hard, as you need to use rubber adapters like the r'cers use to make it look nice.

6mil928

I like the ones with the filters built in that I've seen on the SC cars.

morganabowen

I purchased mine at Sharktoberfest two years ago from some guy that had a few sets. They were $60 IIRC and they seem to be holding up pretty good

Alan

I used some neoprene wrapped fiberglass vacuum tubes fitted with the original GTS ends. Look rather similar to the GTS foams but should hold up better. I also added plastic inserts for the timing belt cover ports. Cost was about $70.

Alan

mark kibort

those both look pretty good. which ones are smoother on the inside of the tubes? Looks like the second set, not the mercedes set.

mk

Ninespub

Alan: Your intake tubes looks really good! Can you give sources for what you bought or at worst, how to find some with specific sizes needed, etc. Thanks in advance for the info!

Paul Barrera '91 $$$$4

RyanPerrella

Alan,

Those tubes look great!

I think the Neoprene is preferred as it should be able to tolerate the heat of the engine bay. Again, very nice setup!

Hilton

I'm curious.. no-one's mentioned the trumpets?

They're venturi's, which makes for no flow restriction, and nice laminar flow on the filter/MAF end of them. Venturis are a standard engineering technique for dealing with turbulence, and for accurately measuring pressure without reducing flow rate, at least if I recall my fluid dynamics classes correctly.

Given the number of posts about turbulence causing MAF and mixture inconsistencies, surely it makes more sense to go with the smoother flow?

928ntslow

LOL..."Venturi's". I remember when there was a BIG discussion over this.

Basically, they are for noise suppression, not flow. The GTS tubes proves that, as they went with the straight open tubes being insulated

There have been several posts on this subject and all you have to do is a search. There are many versions of intake tubes, most being DIY's.

I did mine for less than $20 for each car years ago.