so now we have the results, can the design of the manifolds be assesed based on their performance? Seems the manifolds with round elliptical profile bellmouths out performed the rectangular runner manifolds. Would it be true to assume the HKS and Hypertune also have a smaller plenum volume than the AMS and DI?

 

Yeah, as soon as you start dealing with competing vendors/manufacturers, the crying starts. But for something like an intake manifold ... quite frankly what are they gonna do? Not sell them through you? OOooooo no!

I found your IC testing very informative and ditto for the intake testing. Of course now you're going to be stuck with the customer(s) that end up buying the HKS from you and then call back bishing about how they couldn't make an extra 40+whp on their stock turbo.

Heck, maybe in the future just do what you did for the IC data. Just post the raw data and let ppl draw their own conclusions. Saves you a lot of time in test setup and allows the bench racers to draw creative conclusions.

l8r)

 

IMO that's a really loaded question. To truly answer it, you'd have to test each manifold on a myriad of additional setups ... i.e. different sized turbos and TB's. The data points Dave gave us only hold true for setups very similar to what was tested.

l8r)

 

If I re-test the HKS with a 3" throttle body (which isn't possible because it won't bolt on, you have to run the Q45 TB) then I'd have to test them all. The HKS intake is back on our black car now anyway. So no, I am not doing anymore testing.

 

Dave how do you feel about the benefits of running throttle bodies larger than your intercooler piping? Me not having any idea about the physics of such things, but to me it seems having a small straw that opens up in the end to be larger doesn't make sense. But I guess there is more to it. Your thoughts appreciated.

 

The HKS I'd guess has one of the smallest plenums. The HKS and Hypertune both use round velocity stacks that are then shaped to fit the cylinder head port.

It is MY belief after talking to two other engineers and from my own experience that the intake manifold's performance is not based on the turbo size but on the engine size and RPM range of the engine. I am fairly confident that a well set up EVO with a small turbo will have very close to the same gains as a well set up EVO with a large turbo. I'd like to test my theory and will sooner or later. For now I am confident enough to type it.

There are mixed feelings on this, seems some of the intake manifold builders feel the intake manifold is effected by the turbo size. I do not agree. I don't know **** and am a flannel shirt wearing redneck idiot though

 

crcain, I am little confused by the question. It think you are asking me, "What do you think of running a throttle body that his larger than your i/c pipes?" If that is correct then I'd say it is a good idea judging from the Hypertune results.

My car is going to see more testing. We just built a new intercooler for it this morning. I am going to experiment with this new design (same race core) and then I am going to experiment with some I/C pipe diameter changes. I just have to get un buried from this last two weeks. My desk looks like a bomb went off.

 

^^you can bolt one on to my stock turbo car before installing the 35R in a couple weeks.


Wait....maybe you shouldn't....I might end up buying one!

 

Thanks again for all the testing Dave. I would love to see what some of these Intake Manifold do for a smaller size turbo. Keep up the great work!!

Jason

 

Hi Dave... yeah I was just asking, let's say you have 2.5" IC piping... which internal diameter is even less. Would you see gains going from a 2.5" TB to a 3"?

 

Dave, Are you going to give the hypertune a run down the track in your car?

 

Very nice Dave... I can't wait to see these results! Everyone always is saying that bigger is always better when it comes to IC piping, but I'm wondering if lagg or any draw backs will come from having to fill up the bigger pipes.

 

First off the tb on the hks unit is 3.5in ( 90mm).


What he is asking is with a std. ic core has 2.5 outlets. When used with the hks unit the pipeing would be 3.5in is there any downfall from the measurement difference.

 

crcain, yes, I believe that using a 3" throttle body will make gains even if you only have 2.5" i/c pipes. That is how I ran my RS during these tests, 2.5" upper i/c pipe. The HKS intake was run with the stock throttle body and 2.5" upper i/c pipe.

I am going to conduct a test of just the upper i/c pipe being changed from 2.5" to 3" and then maybe another with the outlet of the i/c going from 2.5" to 3".


The Hypertune is on my car now and staying on it. Yes, it will get run down the track.