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Why no b20 vtec?

red0

The races are typically 8 hours long. In 5 races I have only been able to get a B20 to go the distance twice.

I have been able to get a bone stock B18B to go the distance 5/5 but they are only about 135whp.

I have also been able to get a D16Z6 turbo to go the distance 8/9 times.

The B20 is just not up to the challenge.

Honda Type R

Red0, have you got the swap installed yet? How's it coming along?

red0

No, we are still working on cleaning and performing PMs.

I am replacing all regular wear parts and maintenance items.

red0

So I should be ready for the dyno in about 2 weeks.

I am going to try a very conservative ignition curve, and a D series throttle body.

Does anyone have a restrictor used in World Challenge from 1999 or 2000?

60002nv

What tuneable parameters do you have with your ECU?

If this is a typical road course with a lot of straight away with a few corners in between you would want to pick the engine with the lowest mean piston speed, or one that is historically reliable at sustained high rpm. There is enough data out there to generate some historical data.

If you have a course that has a lot of transient acceleration or low speed manuevers, you would probably want the largest displacement (or highest peak torque) generated engine and you can then use the ECU to de-tune the engine to stay within the bounds of the rulebook.

Since it is most likely a cable actuated throttle body, you will need to de-rate the engine using spark timing. This will require either an upgraded exhaust valve or some temperature acquisition of the exhaust port since the retarded ignition timing will increase the exhaust temperature. you can add fuel while you retard the ignition timing, but there is only so much you can do by adding fuel before you contaminate the oil with fuel. It will also increase your fuel consumption and will likely increase the number of pit stops for fuel

Matt_EH3

You can try with the Type R throttle body and stock exhaust manifold. You'll be in the ballpark that you are looking for hp-wise.

What are the rules for your series to dyno-measure the car? Do you get to pick the place and day of the measurement? You could just play around with that too. Go to a place that is known to have a conservative dyno on a hot day. You'll be under 165whp for sure.