"6cyl" (6cyl)
08/29/2013 at 16:42 • Filed to: itb, e30, m20, bmw, itb thursday
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"6cyl" (6cyl)
08/29/2013 at 16:42 • Filed to: itb, e30, m20, bmw, itb thursday | 0
| 4 |
M20b25 stroked (and possibly bored) to 3L, ignition coils, throttle bodies, cam, and god knows what else.
ohmysti
> 6cyl
08/29/2013 at 18:04 |
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hows your setup going?
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6cyl
> ohmysti
08/29/2013 at 18:14 |
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Not too bad. Not too much progress since my last post. I just took gasket measurements for an old m30 intake manifold (fuel injection manifold pre-'81, IIRC) and I think I will be able to use components from it for velocity stacks. Unfortunately this month has been filled with fixing other things on the car and preventative maintenance and drained my project account so there has not much progress. In the next few weeks I will order one of those manifolds and be able to see how everything might fit together. At that time I should be able to do a proper update.
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ohmysti
> 6cyl
08/29/2013 at 18:29 |
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have you seen the jenveys site? its got some stuff that maybe useful as well as pdf drawings of their itbs. roland manifold+jenvey dcoe itb conversion = winning? at least you wont need to machine in the injector ports to the manifold
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6cyl
> ohmysti
08/29/2013 at 20:17 |
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Jenvey ITB's are very nice but also very expensive, especially when you need to buy 3 dcoe or 6 individual. For example 6 throttles times £152.00 = £912.00 = $1,413 usd. If I used their DCOE throttles it comes out to $1,060 usd. For reference I paid $80 total for the RB26 throttles (which was a really good deal). On an average day you can purchase a full set of RB26 throttles for around $300.00.
Jenvey velocity stacks are £26.00/each = $40/each. The velocity stacks I got were $10/each.
The idea I am working on is creating a budget option to the people that don't want to spend ~$2,000 or more.
As for the rowland manifold. I looked into it and read some mixed reviews about it. Some said it was pretty great others complained about how it was just a raw casting and needed further machining others questioned the quality. I questions about how far they extended from the head. The reason I went with the dbilas was: (1) injectors holes AND fuel rail mounts (2) they can be purchased any day from dbilas and appear to be a higher quality/lighter casting (3) they appear to be shorter which puts the throttle valve closer to the head.
My idea is that if I can come up with the basic "inexpensive" set up. I can post the CAD files for the adapters and people can buy the various bits they need to put it all together and bring the CAD files to their local machine shops to have the adapters made. This would "democratize" the set up and allow for people to find new ways to improve on it and in turn share that back with everyone else.
I think the reason so few people have put ITB's on e30's is that the cost of the bolt on set ups are in motor swap/turbo/supercharger territory. This means nearly everyone that ventures down this path has either a custom made set which makes it hard to compare gains and find room for improvement. Or the few that have a full 2-4k set don't want to modify it for fear of damaging it or making it worse and needing a new set.
In a fully modular system like I am working on this would not be as much of a problem because:
Lower cost of entry
A sense of "build it youself" from the start
Everyone starts on from the same components
In expensive modular components can easily be replaced if modified or damaged