Tom
Chats A Bit
Posts: 218 
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Post by Tom on Dec 6, 2016 21:25:02 GMT
Good evening,
I was just perusing ebay when boom!, suddenly out of no where I accidentally purchased some tt600 throttle bodies. Woe is me and my over happy clicking finger. Anyway, as I now sit here printing off some prototype trumpets and mounts for them I have a couple of questions in my mind!
If I fab up my own manifold for them what is the deal re. injectors? I currently have some rx-8 yellows (more on this topic in a moment) which I was initially planning on mounting in their current location via a butchered OE manifold. However after a little thought and looking at others builds, I am thinking a little more upward angle would be nice, and thus the trusty mill and welder may have to come into play.
What is the situation with the mazda injectors fitting the bike TBs? I am taking a wild guess that the fuel rail wont fit, but is the injector length etc. even remotely similar?
My second question, as hinted at above is about injector size. I currently have some rx-8 yellow injectors in the car because it has a whooshy snail on it. Will these work okay going back to NA or is it likely to over fuel? I am sure that the rx-8s have a slightly better spray pattern, and I would quite like to keep them if possible.
Many thanks.
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Post by josho on Dec 7, 2016 14:27:47 GMT
What are they going on?
in my mk1 1.8 as theyre in the head i got away with using them in the standard location, and i havent yet run out of injector duty cycle even with mazdaspeed cams.
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Tom
Chats A Bit
Posts: 218
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Post by Tom on Dec 7, 2016 17:33:39 GMT
What are they going on? in my mk1 1.8 as theyre in the head i got away with using them in the standard location, and i havent yet run out of injector duty cycle even with mazdaspeed cams. 1.6 car, so the injectors sit in the manifold rather than the head which is quite the pain in the rear canoe! I could get a new manifold milled up at work, but I'm not entirely sure I want to start playing with injector angle! I definitely don't fear running out of injector with the yellows, more it being somewhat overkill having 450cc injectors. |
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Post by joeytalent on Dec 7, 2016 22:11:41 GMT
I cut up a 1.6 manifold and used the original injector holes, and just mounted my ITBs straight rather than at an angle. Some angle would've been better to be honest, so there's more room for trumpets.
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Tom
Chats A Bit
Posts: 218
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Post by Tom on Dec 8, 2016 8:36:05 GMT
I cut up a 1.6 manifold and used the original injector holes, and just mounted my ITBs straight rather than at an angle. Some angle would've been better to be honest, so there's more room for trumpets. Thats my plan, I think I am just going to go for it and mill up a manifold with injector ports the same as the OE set up and go from there. Spent a few hours playing with a full custom set up in CAD. Once I actually start pulling my car apart I can see if its likely to actually work! |
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Post by joeytalent on Dec 8, 2016 13:57:45 GMT
If you have the skills and the equipment, sounds like the best route. I see you're using the TT600 ITBs - to make your life much easier, get yourself a set of the rubber boots from the bike that hold them in place, and make up some matching flanges. Pictures are probably more useful, here's mine:   |
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Tom
Chats A Bit
Posts: 218
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Post by Tom on Dec 8, 2016 14:11:35 GMT
I have spotted your build in the ITB thread, its a neat solution! Has that retained the fuel rail mounts as well? I couldn't find any rubber boots anywhere! Currently thinking of going somewhere like this:    Only issue is locating posts to secure the fuel rail and machine time for the manifold itself as it will need to be done in downtime at work, and having the mill out of action for that long isn't ideal! |
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Post by joeytalent on Dec 8, 2016 15:31:16 GMT
Yeah, I used the original posts for mounting the fuel rail, you can kind of see it here:  That's actually a slightly earlier version than what's on there now; I flipped the ITBs over so the throttle cable was at the front of the car, which meant I could just use a stock TT600 throttle cable with a go-kart fitting on the pedal end. There's loads of the TT600 boots here in the US; this auction looks like the cheapest: www.ebay.co.uk/itm/Triumph-TT600-2001-Engine-Motor-Distributor-Intake-Boots-Boot-/271902331509?hash=item3f4ea45275:g:6-gAAOSwgkRVUnFXShips worldwide for free as well. They also give you feeds for the MAP sensor, if you're going that route for management. |
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Tom
Chats A Bit
Posts: 218
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Post by Tom on Dec 8, 2016 15:40:09 GMT
Perhaps I will buy a spare inlet manifold and get that cut back as far as I can, mill up some flanges and then make my own boots from there, as nice as it would be to get the OEM ones I am really keen to get the upwards tilt on there so I can experiment with different trumpet lengths. Going to 3D print a set in incriments from 45mm right through to 110mm and take them with me when I get it mapped on the RR!
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Post by joeytalent on Dec 8, 2016 16:00:45 GMT
Perhaps I will buy a spare inlet manifold and get that cut back as far as I can, mill up some flanges and then make my own boots from there, as nice as it would be to get the OEM ones I am really keen to get the upwards tilt on there so I can experiment with different trumpet lengths. Going to 3D print a set in incriments from 45mm right through to 110mm and take them with me when I get it mapped on the RR! Sounds like a plan! Keep us posted. |
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Post by atlex on Dec 8, 2016 17:33:56 GMT
this is a seriously interesting thread  |
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Post by Dweenimus on Dec 8, 2016 20:54:59 GMT
I'm liking this thread also!
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Tom
Chats A Bit
Posts: 218
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Post by Tom on Dec 8, 2016 23:16:40 GMT
Hurrah! Interest!
I'll keep it updated, most likely thing to take a little time is getting any welding done, that pesky festive season is getting in the way!
DIY tuning FTW
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Post by cardo on Dec 9, 2016 12:49:38 GMT
I'm following this too |
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Post by BikeTuna on Dec 9, 2016 13:49:29 GMT
Not to sound stupid, and also slightly off topic, but is there any gains to be had by going for a throttle body with a bigger internal diameter? Say off a litre bike or a 1300?
Or to put it another way, is there a bhp or flow point where the size of the throttle body is the bottleneck or do they just flow air quicker?
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le sigh