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Here you guys go. This is a dyno of one of our motors that was making 255hp / 170ish tq. We then tested the RBC with a 74mm tb. Dynos were performed on the same day within a few hours of each other. Yes a loss of 3whp after 7900 RPM but most of the H guys don't rev that high. How about the 16 whp and 13 ft/lbs tq gained at 6300 rpm.
This manifold obviously is not what our particular car needs since we rev our 99 stroke t900o 8700+ I would like to see how it performs on a stock h22 or an h22 that only revs to 7800-7900. One can't argue the fact that it makes a considerable more power before 7900.
And yes I know someone was going to point out the 5500 sampling.. that was due to the fact that we were testing on our race motor and I was trying to clean up the top end after we made the TB change. This is our race car and it doesn't see below 5500 rpms. Just by the graph you can tell it it is a considerable overall gain. The results are by no means tampered with. We actually did all the testing a few hours before we left to go to a race just to see if we could get more out of the car.
Not to mention our S2 manifold utilizes a 78mm TB as opposed to our 72 mm on our RBC for testing purposes. We actually gained 8 hp with the 72mm TB over the stock rsx TB on the RBC manifold.
In conclusion... Is one better then the other? There is no doubt that we need more on top for our motor, but you cannot deny the fact that the S2 lacks considerable midrange due to its design.
Things you should know about this swap
The following is a list of information you should know before performing this swap. Please visit www.hasport.com for the latest information on this swap.
1. Ground clearance – The K24 engine is a tall engine, it is 2 inches taller than the H22 and as much as 4 inches taller than some of the F-series single cam engines. Although the Hasport engine mounts hold the engine very close to the hood, ground clearance is still less than it would be with an F or H-series engine. If your car is very low, this could result in damage to the oil pan during normal driving.
2. Power Steering – The Prelude power steering hose will not work with the K24 power steering pump. New power steering hoses need to be made and the reservoir will need to be relocated.
3. AC – To retain AC, you will need an RSX or EP3 AC compressor and have custom AC lines made to fit the car. The TSX compressor can be used also, but the air compressor’s thermal protection circuit will need to be converted from 3 wire to 1 wire type found on the RSX and EP3. On top of custom AC lines, you will also need an aftermarket front crossmember. The stock front crossmember won’t allow you to mount the K-series compressor.
4. Shift mechanism – The TSX or 02-07 Accord shift mechanism and cables are needed to operate the TSX and Accord K-series transmissions.
5. Cooling – The Prelude’s stock radiator has the outlets in the wrong location for easy use with the K24. It can be used with custom hoses. You can use the EP3 radiator by relocating the bottom mounts and making new top brackets. If you choose this route, you can also use the Accord condensor fan, it bolts to the EP3 radiator. For the radiator cooling fan take the stock Accord fan and blade and transfer it to an EP3 radiator fan shroud.
6. Clutch Actuation – The Accord clutch master will operate the K-series slave cylinder. You will need some custom lines to make the connection.
7. Fuel Line – The K-series engine’s fuel pressure regulator is located in the fuel tank on the K-series powered cars. You will need to add a fuel pressure regulator along with some custom fuel lines.
8. Exhaust – The K-series swap header from Hasport made by DC Sports will bolt up and clear the crossmember. Modifications to the exhaust need to be made to retain the catalytic converter.
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