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Does anyone have a spare Turbo throttle cable they could measure the length of for me to check against the NA cable? Looking for the total cable length and the sheath length. Thanks in advance if you've got one!
what is the latest on this? I need a kit as well haha
Progress is definitely slower than I'd like. I'm currently working on an alternative throttle layout to simplify things a bit and reduce the number of pieces. I'll have to post some images of the potential new direction over the weekend.
Groovy. Out of curiosity, how many folks are interested in the 8V design? Seems I've received more feedback on a potential 16V design up to this point.
Thought I'd share a bit of what I've been (slowly) working on...
So I'm considering changing the original plenum design shown on page one from a center inlet to an angled inlet similar to the stock 951 manifold. This allows for more plenum volume in a similar space and will likely make plumbing easier. I'm not 100% sold on it, as I do like the look of the center inlet (a la BMW M50/52/54 engines) but it might just work out better, especially for 951 cars.
I also started playing around with a way to collect the vacuum signal from each throttle body to keep it from looking like an afterthought. My first idea was to simply use another piece of extruded fuel rail and connect it to each intake runner via a short hose under the flange. Turned out all right I'd say and looks pretty clean.
Then I got to thinking a bit more on vacuum collection. I thought, "what if I can integrate the collector into the machined throttle bodies versus adding an additional component." That led me to exploring a different throttle body design with vertical throttle shafts and a conn-rod linkage. While not allowing for the same modularity as the original design, I think it might suit the 944 better and be more of a purposeful design. It also uses fewer components since the main throttle body block is all one piece. Having the ability to mount the TPS on the top of the assembly is another nice advantage.
Just thought I'd share the progress thus far. Enjoy the weekend everyone!
I think that the vertical arrangement is much cleaner than the previous one. Would this require a TPS on each Throttle body working independently to provide most accurate position of the throttle blade? TIA
Groovy. Out of curiosity, how many folks are interested in the 8V design?
I'm still here for it. I'm very interested in an ITB kit, but I am financially concious about it. No blank checks from this guy. I don't have the slightest idea what your completed system will cost, but I'm sure you understand the concept of pricing yourself out of the market.
Would this require a TPS on each Throttle body working independently to provide most accurate position of the throttle blade? TIA
Nope, just requires a single TPS. Each throttle is connected via a threaded turnbuckle allowing for adjustment of airflow between the throttles. The idle is then set in one location at the adjuster on the throttle pulley.
I'm still here for it. I'm very interested in an ITB kit, but I am financially conscious about it. No blank checks from this guy. I don't have the slightest idea what your completed system will cost, but I'm sure you understand the concept of pricing yourself out of the market.
Target sales price for the completed system is $3500. This would include the inlet manifold that connects the throttles to the cylinder head, the throttle assemblies with linkage, and the intake plenum. Designed to require minimal additional work from the end user for installation.
Hi JRP,
I have experience with Weber Carburetors 48 IDA 's on small block Chevy V8. The race car braking system required a vacuum booster for proper brake bias (vintage Formula 1 braking system in late 1960's.
The first design of the vacuum system was similar to yours
The discovery was the tubing id was too large so each cylinder could "cross-talk" with another affecting throttle response.
Inglese Induction (now Jim Inglese) had in 2002 a vacuum system with miniature copper tubing and fittings, a common connection block with an outlet larger diameter for the vacuum hose to the booster tank. The restricted miniature id prevented cylinder "cross-talk" but provided sufficient diameter to replenish the vacuum on each brake application. Might need a booster tank in series with brake vacuum cylinder for your application.
Can contact Jim at https://jiminglese.com/
Tom
Last edited by T&T Racing; 06-30-2023 at 10:27 AM.
05-11-2023, 11:22 AM
