I'm about to purchase two RB928 engine's for my LST. From doing some searching and reading topic's on this engine, the best pipe option's are; 2045 for best all round performance and economy. 9886 for best top end performance. I will be getting both pipes. From reading the topic's, it seems that the LST manifold causes some issues with getting the tune 100% right.
My question is; would it be possible to run the inline .21 on-road manifolds instead of the LST manifold? The fitting up of the manifolds will not be a problem as I have sat my on-road system on the LST and there is no clearance problems as per photo's.
Standard LST Header with RD Logics Pipe
RB On-Road System
As you can see from the photo the RB manifold is considerably shorter.
RB V's LST systems
Do you think that this would work, running the .21 manifolds or are they only suited to the .21 engines? If you think that this option is a good idea for the LST which manifold would you suggest? Do you do a combo pack that includes all three manifold options?
I only ask as I want to have the best set up for my engine.
Thanks
-------------------- Tassie-Devil n. carnivorous marsupial, coloured black with white markings, mainly carrion-eating and of fierce appearance, and occurring only in Tasmania. Posts: 8 | From: Tasmania Australia | Registered: Apr 2006
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I don't own a TM 928 (I guess you'll already get the RT) but until now I have tried the 192P, 04P (which I was told has the same lengh as the 2018 combo manifold) and 05P with the 2045P, 2018P and 2006P on my C6-BB (buggy and onroad car) and would like to say that every combo works but when using an onroad setup the exhaust port area should be a bigger one (compared to the C6-BB's displacement/exhaust area design). Otherwise the performance window will be very small ending (due to the engine) already before the pipe really comes 'alive' with an onroad manifold. But on a S7 these onroad setups are working great mainly due to the bigger exhaust area! And the RT seems to have a big enough one for trying the onroad setup. So the first point is to make sure that the pipe/manifold characteristics fit the engine characteristics. If this is given then the weight of the car can be countered by a certain gear ratio up to a certain level.
How will you start the engine with the onroad manifold? Bumpstart? Rubber wheel on a big electric engine 775+?
[ 07. April 2008, 16:50: Message edited by: Stefan ]
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The problem is that the on-road pipe system we have developped is made for on-road cars which are way lighter then a truggy and also the rpm range used in on-road cars is very high compared to the truggy engines.
It could be that if you use this system with the longest manifold(01351-06P) on a .28 engine that this could work in combination with a higher gear-ration, but since we have never tested this I cannot guarentee you this.
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Tassie! Whats happnin! See you at the 2d's site. For what it's worth, I am using a **** pipe with my TM728 and it is working well. I am going to get an 086 pipe too but I have not had tuning issues with the LST header so far. I have to admit I am using an OS Vspec carb on mine for about 1/2 gallon and really do like it. The heat shield on the carb really helps too!
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Well I got round to getting this done and it made a big difference over the standard LST manifold. I used a long conical on-road manifold.
-------------------- Tassie-Devil n. carnivorous marsupial, coloured black with white markings, mainly carrion-eating and of fierce appearance, and occurring only in Tasmania. Posts: 8 | From: Tasmania Australia | Registered: Apr 2006
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