![]() ![]() Testing has shown an average 30 horsepower gain between 5,000 and 7,500 RPM over competitor tunnel ram intake manifolds. It's polymer construction is not only lightweight and high strength but also virtually eliminates power-robbing heat soak that occurs with commonly available aluminium intake manifolds. This allows interchanging of the various runner lengths so racers can experiment with finding which combination makes the most power in their application. The LSXHR 103mm rectangular port LS3 intake manifold has a set of "tall" removable velocity stacks, however "medium" and "short" stack options can be purchased separately. I have some dyno graphs that illustrate this if you'd like to see them.FAST has developed the industry's first polymer tunnel ram-style intake manifold, ideal for generating maximum power in boosted and naturally aspirated engines. The IR stuff in many cases will make more HP without an airbox and being exposed to outside air with no box. I have some dyno graphs that illustrate this if you'd like to see them.Īnyhow, many times a box is used to filter and direct air, along with holding a restrictor for some class racing. They also like cubic inches in a lot of their racing and RWD but that's finally coming back to the USA too as people here have had their fill of the FWD crap.Īnyhow, many times a box is used to filter and direct air, along with hold a restrictor for some class racing. In fact some people need a progressive linkage or it's too jerky for them! Also just realize that Australians ARE crazy and they all drive cars with blowers and NOS and have mohawks. You will sometimes, with really big cams in these systems see the exhaust and regular reversion in the form of standoff above the runners with some of them at lower engine speeds.Īlso when you crack the throttle instead of an entire manifold plenum having to pressurize up slowly instead, now the port sees full atmosheric pressure and density basically almost instantaneously so the throttle response is WAY better. With enough overlap the IR systems will also lope too and turn black under those cute little throttle bodies from idling with all the same vacuum under them when they are closed and idling but they have less of the total runner to become as contaminated since the higher pressure is close at hand right above them and in the rest of the runner. The exhaust reversion can and does fill up the whole plenum behind the central TB or carb and the whole runner of each cylinder with exhaust diluted air that causes the repeated and erratic misfiring that we hear as the cool loping sound some people love so much. The independent runner stuff with the small independent throttles before each port with the constantly pressurized near 100 kpa "mega plenum of the world" above those same little throttle bodies are just less affected by the exhaust reversion that affects a plenum car worse since the whole intake system on these setups is at very low pressure and the exhaust is at such a higher pressure. ![]() Ok, htere might be some if you have enough camshaft duration (but it would take alot). Each throttle had a vacuum port to adjust the balance between TB's.Very true, but keep in mind on an ITB intake, that the "world" is your plenum, so there is never a loss of pressure in your intake (unless you suddenly get jetisoned into space). 3.5 litre I-6, 6 individual TB's attached to a plenum box. The older M5's (~1990) had a very similar intake. But the hurricane intake kind of fit the best of both worlds since there is a "box" that becomes the plenum. Without a decent plenum volume you lose velocity in the runner at lower rpms due to a lack of "momentum." That's why tunnel rams or sheet metal intakes will lose low end power. the LT1's short runner design which lost some down low relatively, but picked up more up top. The TPI's long runners built torque quick but fell on its face early vs. Plenum volume and runner length play such a dramatic role in power production that you need to pick a design based on how you'll be driving i.e. It's like the old days when we used to pick dual/single plane over tunnel ram. Please register or login to enable Dark Mode.Hot Rod Power Tour/ Pump Gas Drags/ Drag Week.Gen 5 Camaro Tuning, Diagnostics, Dyno results. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |