CJM Billet Intake Manifold

Jinxx

any idea how much performance over a ported upper and lower intake this would make ? ...those was seeing 30 ish hp/tq with a boosted car ...to convert over would be intake and new intercooler which would be 4.5kish ...granted it by far looks the best

jwick

Is there a price listed for this manifold yet?

Cuz if your $4.5k doesn’t include the manifold, there’s no way it costs that must just to buy a new intercooler and intake piping over the radiator.

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

Jinxx

In this thread he said the intake was 3k ...and if you replace the intercooler to match it I would assume 1200 ish .....then retuning etc ....this would be a pricy upgrade over a ported upper and lower if the performance gains are similar

jwick

I didn’t catch that. Then, yeah that’s probably about right.

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

Spooler

This manifold is so you can run over 20 psi of boost without blowing the plastic manifold to pieces. If you have a properly built motor, right fueling mods (injectors and fuel pump volume), and the proper turbo's, then this upgrade is for you.

phunk

To be entirely frank, this manifold and intercooler arrangement would most likely be a practice in futility if the intentions were to find significant power gains in applications under 1000hp. Our DE manifolds picked up HUGE power gains, but that is cause the stock DE manifold sucks. So far, the VHR manifold is very comfortable at power higher than almost anyone is running a VHR.

At least, that is my GUESS. Perhaps I am wrong, and perhaps we will be pleasantly surprised to see dramatic effects come into play much sooner. There is just one way to find out.

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phunk

We took the stock intake, no porting, to 818whp at ~17-18psi, which felt like we still had a fairly efficient and well matched combination. Perhaps it could have made another 30-40hp at the same boost with porting? That would be pretty wild... though I am skeptical; our turbo system still had plenty of headroom. Without knowing the test circumstances, I am guessing that if someone genuinely found 30HP in porting, they were possibly asking their turbo system for all its got. I dont believe we would have seen those results.

On the 818whp pull, the stock intake was showing no clear signs of becoming a restriction. This makes it difficult to estimate potential gains from changing to our intake. So far, it appears there would be virtually no gains at this point, even if our manifold had the potential to facilitate more airflow. When the existing resistence to airflow is so minimal, the potential reduction in that resistence is equally minimal. The boost levels were not choking us, so I dont imagine we would have found any worthwhile gains in swapping to our intake on that day.

I think we will need to increase the airflow volume a bit further first to find the point where the stock manifold has become a bottleneck. Until we find that point, there is no easy way to estimate when the potential of another manifold will come into play. I currently feel that up to the 800-900hp level, with a turbosystem ideally configured for that task, there will be little gain to find over the stock manifold.

In conclusion, we have no expectations of gains over a stock or ported manifold under the conditions we tested the stock manifold up to. We are crossing our fingers to merely do as well up to that point, and then continue to do well as we take things further than was possible with the stock engine and manifold.

Currently, It is my belief that (in turbocharged applications where the turbosystem is operating well within its efficiency) there is nothing to gain in changing the stock intake manifold out in an application that would not have burst it open. I think you would do that before you found it to be a bottleneck worth addressing, thus I question if it is even possible to demonstrate the potential gains if we will have to exceed the physical limitations of the stock manifold before we could find them.

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Jinxx

Good info .. I was using SOHO dyno charts that he advertises for his ported upper and lower intakes

phunk

If it works it works! Up until then all were able to do is speculate. It will be great if we see some meaningful gains early on that could imply serious gains further up.

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Elmo370z

Ahh Charles Allen Poe