A day on the flow bench

[DerekEVO]

it looks cool though...

[talondsp]

This is great info. Thanks for all the testing Dave!

[M_Acceleration]

David, Why don't you like ITB's? They can do wonders to make up for the throttle response lost by manifolds with huge plenums...

[David Buschur]

Seems the solution is to not use a manifold with a huge plenum.

[David Buschur]

This thread has gotten pushed back quite a bit.

I had an idea for our last attempt at an intake manifold. It took quite awhile to get things machined, formed etc. Then it was all welded together and it sat on my desk for well over a month.

Spring is here, I took the RS out Sunday, cleaned it and took it home to my garage. On the way home I got on the car before I got to my driveway and when I hit the brakes I learned it had no power brakes and I passed my driveway. The idle also sucked and I was pretty disgusted with the car.

Yesterday I decided that it was time to make the last intake manifold swap on the car and try out the intake we built. This morning we loaded the car on the dyno and made two baseline runs, 694 was the best. The power is flat all the way past 9,000 rpm.

Without taking the car off the dyno we pulled the new DI intake off the car and installed the new BR intake on it. I again made two pulls. The best of which was 699. The curves are identical in shape and the small difference in power isn't worth discussing.

I believe that we have a good grasp on runner length and plenum size at this point and I feel it would be extremely difficult to improve on the new DI intake I had on the car or the new one we built.

I didn't take pictures of ours before installing it, never crossed my mind. I don't know if we will ever produce another one. I may even opt to re-install the DI intake so I can run what we are going to actually be selling/recommending.

A word of warning. I used the Vibrant vacuum block on the car when I put the DI intake on to make installing it easier and swapping intakes faster. IF any of you choose to do this MAKE sure you use a VERY LARGE nipple on the intake, with a VERY LARGE hose running to the vacuum block and another VERY LARGE nippple on the vacuum block. I used about a 1/4" nipple and hose and it was not nearly large enough for all the components running off the block and I had NO power brakes because of it. Just keep it in mind. I'd say a 1/2" single hose would be ideal and no less than 3/8". It may just be the best idea to give each component it's own boost/vacuum source on the intake like the factory does.

This is going to conclude the intake manifold testing. I do not see myself ever visiting this subject/testing again.

Thanks for the interest.