1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

12a blow thru turbo

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Old 01-26-08, 09:27 AM
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12a blow thru turbo

Im starting a turbo project i have a moded s4 mani and turbo i also have a down pipe and mid pipe waiting for the rest of the exhuast pieces. i got my fmic, bov, and piping, im waiting to get my rising rate fpr and fuel pump. Thinking about making my own carb hat for my dhla 48 can any body help me with that im using rb intake mani and im worried about clearance issues most intakes ive seen from rotary shack are tall mine is alot shorter. i want to know what else im going to need besides a dizzy. and what other work is involved what else should be changed and what not.
Now for the parts.




I also plan on making a strut bar thanks to glazzedhams nice write up. im also making brakets for these
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Old 01-26-08, 10:31 AM
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You ask about the carb and intake and don't post a pick of it? No pic, no help, lol. Pic preferably of carb/intake mounted on engine, in engine bay.
Old 01-26-08, 10:56 AM
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For the carb hat just get ahold of Robert at RotaryShack. They really aren't that expensive to try and mess around with fabbing up your own unless you've done it before.
Old 01-26-08, 01:25 PM
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Originally Posted by trochoid
You ask about the carb and intake and don't post a pick of it? No pic, no help, lol. Pic preferably of carb/intake mounted on engine, in engine bay.
Oops heres an enginebay shot.


I wanted to try bcuz If i can figure out how to make it i can have my uncle do it for me at his job for next to nothing he even offerd to make me a strut bar for free. Also a couple hundred for a aluminum box is damn pricy for me but then again im broke and 16. So ne help is welcome.
Old 01-26-08, 01:36 PM
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Much better. There really isn't any height difference between the RB and the full wrap around intake manis. If you can locate a TII oil fill tube to replace your's with, then simply make a box about the size of your current filter with a cone shaped supply coming out horizontally.

If you don't change out the oil fill tube, then you simply need to route around it.
Old 01-26-08, 01:40 PM
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Originally Posted by trochoid
Much better. There really isn't any height difference between the RB and the full wrap around intake manis. If you can locate a TII oil fill tube to replace your's with, then simply make a box about the size of your current filter with a cone shaped supply coming out horizontally.

If you don't change out the oil fill tube, then you simply need to route around it.
Thanks trochoid that was my main concern getting around that so how would i do this i doubt that **** will just pull off. also what am i gonna have to do with timing since i kno absoluteley nothing about that. And i was wandering what im going to need to tap ie oil line and were id tap it ne body have a good thread for me to read ive searched pleny but haven found to much alos pics would be helpful.
Old 01-26-08, 02:07 PM
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Talk to Robert at Rotary Shack 680rwhp12a , he likely has a carb hit kicking around and can save you a lot of trouble.
Old 01-26-08, 03:51 PM
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The oil fill tube is a friction fit, new one will simply tap in. On the front cover, just below the MOP, there's a round dimple. Tap that spot for a 1/2" NPT and use a threaded brass barb found in the plumbing section of your hardware store.
Old 01-26-08, 07:03 PM
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by cb performance turbo book a well spent 15.00 lots of info on boost preping carbs
Old 01-26-08, 07:28 PM
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Originally Posted by broke7
by cb performance turbo book a well spent 15.00 lots of info on boost preping carbs
Hey thanks i got a book for tunnig dellortos from cb performance
Old 01-26-08, 08:48 PM
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okay any updates?
Old 01-26-08, 11:58 PM
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how are those seats. i was looking at them on ebay? good?
Old 01-27-08, 08:15 AM
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Good luck with the turbo project those are always lots of fun. Im currently on my own turbo project and its a head ache!
Old 01-27-08, 02:03 PM
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Originally Posted by markusj08
how are those seats. i was looking at them on ebay? good?
They look good and are pretty sturdy. once i get the brackets made ill post pics.
Old 01-27-08, 05:52 PM
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i have a carb hat that will fit your dellorto, for cheap!
also you will need to make a jet cover plate for the dellorto since the cover they come with is vented..
also remove the choke assembly and seal up the holes , since its vented too.. use some JB weld
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