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·Peter-san, can you post links to sound files of IRTBs here?
Keep in mind the motor alone built with all that, assuming you do none of the work, is in the $8-10k neighborhood, and that's assuming you put the thing in yourself...freedomgli said:What goes best with IRTBs: RoadsterJDM.net, for one. Or how about a 2.0L stroker motor made of forged crank, forged connecting rods, forged high-compression (greater than or equal to 11:1) pistons, upgraded main bearing support, better oiling (perhaps better baffle tray, true high volume pump, Accusump, or dry sump), ARP hardware throughout, gasket matched everything, fully built head including larger titanium valves, solid lifters with shim under bucket design, titanium valve keepers, fully radiused valve seats, high performance valve springs, big cams, adjustable cam gears, high-strength timing belt, dual feed fuel rail, bigger primary injectors mounted outside the throttle plates, quality tuned header and exhaust system sans cat (otherwise you'll destroy it during tuning when running rich), thermal and friction reduicing coatings throughout, everything lightened, balanced, and blueprinted, a whole bunch of other secret pro engine builder tricks, killer standalone engine management, 100 hours dyno time with the assistance of a professional tuner, etc.
What you're saying though basically applies. The Miata's BP and B6 engines more or less have fixed capabilities for flow, compression, rev limits (pre-programmed and real limits before things start going to crap), etc. Those limits do not really allow for IRTB's to have great potential with the engine in stock internal form.freedomgli said:Obviously, each year is a little different and so not all advice can be applied equally to all Miata.
It is not uncommon for a well-tuned standalone ECU to add 10-20rwhp to a mostly stock car. Not just the MS.touge miata said:soooo i hear that a stock miata with a MS can make an added 20HP..... (yes, tuned) what do you think the gains would be with IRTBs and a MS with JR header, and no cat and RB exhaust? since i wasn't asking what just bolting on a IRTB setup would make i thought i would elaberate.
Your car might as well be stock since adding just an exhaust and header alone to a '97 BP motor isn't really the type of mod that allows you to utilize the extra breathing capacity of the IRTBs. My educated guess would be that 4 properly tuned throttles might add at most 20-25 whp to a BP with standalone, JR header, test pipe, and RB exhaust, most of which is due to leaning out the fuel mixture with the standalone. To make real hp numbers with 4 throttles you need to rev high, do lots of head work, and the necessary bottom end mods to support it. Like in life, there are no free lunches when it comes to N/A tuning.touge miata said:since i wasn't asking what just bolting on a IRTB setup would make i thought i would elaberate.
yeah i didn't mean to make it sound like just the MS ECU could do it... i guess i was thinking of this post someone made about their MS...Bryan said:It is not uncommon for a well-tuned standalone ECU to add 10-20rwhp to a mostly stock car. Not just the MS.touge miata said:soooo i hear that a stock miata with a MS can make an added 20HP..... (yes, tuned) what do you think the gains would be with IRTBs and a MS with JR header, and no cat and RB exhaust? since i wasn't asking what just bolting on a IRTB setup would make i thought i would elaberate.