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Old 08-01-2012, 08:37 PM   #76
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Originally Posted by craz azn View Post
Any reason why you aren't going for a bigger plenum? You have anything at the ends of the stacks ie trumpets?
Because i already have long runners it was recomended to have a smaller plenum.. No trumpets but i put a radius onto the ports leading to the itbs. When i remove the fg from the pattern ill show you.
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Old 08-07-2012, 11:15 PM   #77
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You will need to be filling the cylinders with oxygen not with vacuum.
The highest concentration of oxygen is in the middle inside the plenum, near walls it is mostly vacuum or less oxygen. Hence reason for trumpets, pull the air from the middle section of inside the plenum walls.
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Old 08-07-2012, 11:34 PM   #78
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I would try to keep that radius you added to the runners to a minimum. From what I've read and been told, you want your runners to end abruptly, this will give a stronger pressure wave resonating through the tube, and should add to the ram effect
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Old 08-10-2012, 11:58 AM   #79
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Rudy, illa, diy, you guys all right.. When i replied i forgot about that little detail about the trumpets and the center air volume... Im currently working on another plenum design that is bigger and will have the trumpets as well.

I hope to have it done this weekend along with the tps working
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Old 08-10-2012, 01:23 PM   #80
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Looking forward to it!
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Old 08-16-2012, 08:29 PM   #81
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Ok so i didnt have time on the weekend to get some stuff done... But i did some tonight..

Here is that new plenum design i made at work... Note that they are 2 parts and will fg tomorrow night.













Other bit of news... I ordered the prev gen tps gsxr 750 itbs it came in today, picking it up tomorrow. Im pretty sure i can get it all put together and running by the end if the weekend...

Oh and yes im going to make some trumpets for the plenum


Oh... And my little one will be here in december

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Old 08-17-2012, 06:20 PM   #82
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Started on the fiberglass work... Tomorrow morning ill take the pattern apart and get it ready to install the trumpets that im glassing as well... But i need more resin :s



Sunday will be a bust for me going to the CNE but i should have most things ready by the end of the week.... Just in time for bimmercruise... Fingers crossed X-)
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Old 08-17-2012, 07:27 PM   #83
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Oh... And my little one will be here in december

Congrats!
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Old 08-19-2012, 12:47 AM   #84
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since your in mississauga ( and need resin) hit up composites canada, they got everything you need to do the fiberglass work and a wealth of knoledge... I wouldnt get my stuff anywhere else. Bring 1 of your molds in if you want I'm sure they can offer some tips.. Lookin awesome!
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Old 08-19-2012, 07:33 AM   #85
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Diy... Ill check that place out but i just headed to CT to get more resin... About the pattern... On the ends i used a 2degree draft angle.... I really should have gone with min 5deg... And even though i used 3 coats of silicone on the pattern, mold paste/ wax may have been better around the exposed endgrain areas on the pattern....

Another little wall to climb is for the inner trumpets...i was able to fg them but not that much room in there... I need to fg a bend to get them where i want them in the plenum.

I really hate to say it but i dont think it will be ready for bimmercruise

If by some miracle i do get it all done in time... No time to tune it

But im still going to try...
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Old 08-19-2012, 08:09 AM   #86
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Congrats on the little one, been waiting to see the ultra sound pic, its a life changer but only for the better!!

the round pieces of would your using for the mold, did you make then about a 1/4 inch smaller then they need to be to account for it being an external mold

I hope your coming to bimmercruise even without the car being done, we could use some extra help for the autoX!!
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Old 08-19-2012, 09:14 AM   #87
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^^^ thanks

Yeah ill be there itb's or not.

Here are some pics as of this morning after the second layer of fg







Here is the fg trumpet.. Trim needed of course









Yup.. They fit

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Old 08-19-2012, 10:19 AM   #88
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Hey congrats on the work and the little one comin along!

Lookin good
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Old 08-25-2012, 03:43 PM   #89
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Here is where im at as of now...





Have all the elbows made but not finished... Still have a lot of trimming to do and more fg work... I might try a little during the week. But more than likely next weekend.

I was able to get the bmw tps to work.. But the range in narrow... Does it matter if im tuning via piggyback for afr and timing?
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Old 08-26-2012, 11:04 PM   #90
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Wow, those trumpets look great. I will need 4 of them for my current ITB project.

Sorry for the long post, I did not meant to.

This is where I'm on my ITB project.

I need to figure out throttle linkage , the middle connector for the both ITB pairs
I need trumpets and the piece to mount my BMW throttles to the S14 plenum.














If I only knew how to use my brand new Moomaster arc/tig welder.
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