The shape and size to be the best compromise between packaging, performanceĪnd acceptable sound level for a general market car. Toyota will have spent thousands of hours perfecting The best all round velocity stacks for the 20V BT are the ones that came with The bellmouths I designed for my build were based as closely as possible off the eliptical design in that study as much as possible given the limited space I had to work with and the fact that my forming tool was hand made. I also agree with the point of that study in that any bellmouth is better than no bellmouth but some designs will be better than others. "Proper Bellmouth" doesn't really mean anything. SQ bells have a good flare and a large radius. T3 stacks have a small radius, which may be comparatively detrimental. Blair in "Best Bell" even a simple radius can be effective. Second, velocity stacks are used to try and increase the discharge coefficient of the interface between the intake and atmosphere.Īccording to research reported by the late Professor Gordon P. Many, many companies make stacks in the 70-80mm range, which may be indicative of something, especially for an otherwise stock blacktop 20v. Unfortunately, most simplified harmonics formulas are based on overall intake length, from the valve seat to the end of the runner, and intake camshaft timing, so what may be good for one engine might not be best for another. First, they are part of determining the overall length of the intake runner and thus affects its natural harmonics. If you're going to state something 'for the record', please cite your sources. Most other design are not a proper bellmouth. The best design I have seen so far is from Tec Art's. You want a proper bellmouth shape in order to improve performance. If the stacks are not designed with the correct shape, they either won't improve performance or may reduce performance. Gotzoom? wrote:Just for the record, the purpose of velocity stacks is to improve performance. T3 will always have it instock so you'll ge it quick but the only thing with T3 is if you're looking for a specific length, Gabriel may not have it. The ones from SQ may take a while to get since it's coming from Australia OR you can check with Battlegarage racing service who sells SQ product and their here in the states. If you're looking for mid range then your choices would start from 70mm and up.Ĭanyon_carvers wrote:Both product by T3 and SQ are superb. T3 sells only 70mm long velocity stacks and SQ will sell from 50mm,70mm,100mm & 110mm. So in general, longer runner length is for lower rpm and shorter runner length is for higher rpm. The short stacks are for high end and the mid to long ones are for mid range power. Or you can go with ITG filters.Ĥage bt bore size are bigger then the silvertop and the length will make a difference and this is where you'll make your decision on how you want your engine to perform. SQ will.Īs for filters, you can go with T3 "UNI" filters and that'll work just fine with SQ.
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