wow, that was a little uncalled for...

 

I love EVOM!! i REALLY DO.

 

The 20g worked better going from 6 blade compressor to 5 blade. My guess is he is making 5 blade wheels that can be bolted in with no machine work.

 

As for your downpipe, if I have to use it, will it fit the stock cat, and other high-flow-cats?

My plan is to get this new GT35R kit, use the WORKS ceramic coated downpipe, WORKS "stock cat" modified to three inches, and the Tanabe Medalion Touring cat-back.

The Tanabe cat-back is under 93 decibels at all RPM's and that's a must California. It also has 80mm piping, a really high flowing muffler, and a 100mm tip. The decibel limit in California is 95 decibels.

The reason why I want to run the WORKS cat is to stay legal. I can't even run a aftermarket high-flow-cat, unless my stock one is not working properly anymore, so the WORKS stock modified cat is my only option for higher flow.

As for the cat-back I want it to be quiet and stay legal also. I live in California, so you get the idea why I need an exhaust system like this.

For a great turbo kit!

 

Our downpipe would bolt to a stock cat, but if the inlet/outlets of it aren't 3" it is a waste of your time.

240z, you have the PHD in Engineering, there is nothing I can explain to you that you didn't already learn in college. I'm just some redneck country boy that builds fast cars, barely even finished high school............

 

What would the fun be in reducing our carbon monoxide intake? Thats what fuels us! A double dose of carbon monoxide with a hint of C16.... its the racers version of "Starbucks".



I like to serve him open face sandwiches topped with ground up Ebay parts with a slight hint of lemon pepper. He washes it down with a budlight and a shot of C16. It really gets his insides brewing and makes him strive towards making things better. Its kind of like feeding a Pitbull raw hamburger with gun powder mixed in. It comes out pissed off at the world and ready to attack.

 

240Z, I was actually going to answer your question seriously but didn't want to put up my much to basic version of why there is less back pressure. Here is what I was going to tell you:

"When you make the compressor wheel more efficient it will slow the shaft speed down and make the turbine wheel work less, this reduces back pressure."

I didn't feel that was technical enough for a college man like yourself so I asked Robert at FP to give me his version of what I was thinking just for YOU!

Here is what Robert at FP says:

"Compressor efficiency is one of the big parameters that determine both spool up and the amount of actual power required to pump the air. By improving the compressor efficiency you will decrease lag and also decrease the amount of "pressure head" required to drive the compressor. Changing only a compressor wheel and observing both improved spool AND reduced back pressure ("pressure head" is a good indication of a design that is on the right track.)"

I truly hope that this is going to make you happy and not get me some smart *** comment telling me how dumb I am.

 

Thank you very much David answers like these are very much appreciated.

 

Intuitively, this condition will create the double whammy. If we think of the turbine wheel as a pump, if you were to reduce the shaft speed you effectively reduce the flow. The reduction in shaft speed(flow potential) should cause additional increase in backpressure on top of the fact you are making more power, thus generating additional exhaust flow and increased backpressure.

I would agree that with increased compressor efficiency you can potentially decrease shaft speed and generate additional efficiency/flow. However, without touching the turbine side you have not increased the total efficiency of the turbo.

I know you are just quoting, but as I read this I say to myself, "Am I learning something new or did I just lose 3 IQ points?" I am not familiar with his reference to "pressure head" although I know those words and their meaning individually. I even passed this by my turbo guy and he is at a loss. If you truley observed this occurance then their should be a plausible explanation. I will do some digging and post my findings.

 

how can you be upset with HPF asking a question that would answer a lot of questions lots of us have. doesnt more information help all of us?

maybe you want DB to say this is my turbo kit, it cost 10,000 dollars and it makes lot of HP, but i wont tell you how much HP, at what PSI or any other useful information.

for saying HPF is unprofessional is very idiotic IMO.

 

Thanks for the answer David! As for the cat I intend to run, it's a stock cat that has been modified to three inches. It will have three inch flanges and piping. Can you also please answer this question. Will it be possible to include a four intake kit for a stand-alone application with this new GT35R turbo kit?

Don't let these people get under your skin. You have accomplished a lot in the 4G63 scene with your 18 year history. That means a lot to everyone. You don't always need a college degree to be considered a successful or intelligent person. Experience alone can be just as valuable. Not being able to go to college just means you did not have enough money or time. It does not mean you're stupid!

Keep up the good work!

 

Who cares how "they" did it. If we can buy a part for x amount of money and it is faster and as reliable now then it was in the last build version then great for us! If your so interested in how they did it have your "turbo guy" give you some lessons".

Face it, this is not a scientific community that expects the person making the claim to validate and disclose their methods. To us (the purchaser) the validation is in how much power the turbo produces, not how they made it do it. It's good to have them "prove" and "reproduce" said power but naive at best to think they are going to write up a nice "white paper" for everybody to read and then duplicate the new turbo design.

I need a beer now

 

Actually, HPF was unprofessional. DB was sarcastic, but civilized. Probably bc he caught **** for being too aggressive in the past. All he said was "HPF, if you want the data, get it yourself". HPF chose to interpret it as an attack.

And for the record, DB's turbo kit is $3,000, which is cheaper than just about everyone else's. The new turbo would be a couple hundred more, which he mentioned in the first post.

He also mentioned, in the first post, how much more HP it made when directly compared to his other kit with the only change being the new turbo (same manifold, intake, ecu, injectors, and everything else).

 

I posted dyno graphs of both turbos. Both turbos were tested at the same boost level. Both turbos were run at the same AFR's. I went on after the test to make even more power than I had ever with the car before. I didn't attempt to do that during the testing as that wasn't the point of the test.

The area under the curve shows the turbo spools sooner and makes more power throughout the RPM range.

We do not build 4" inlets for our turbo kits. We use a 3" inlet with a 3"x4" coupling at the compressor housing. We have dyno'd the car with this turbo inlet and with non at all with no change in performance at all.

I didn't not go to college because I didn't have the money. I didn't go becuase I feel it would have been a waste of time (For ME) to go. I took about 1 years worth of college in the Army, taking night classes and such. I got my basic crap out of the way and did much better in college classes than I ever did in high school.

A college degree doesn't make you smart and it sure as hell doesn't give you any fabricating skills or the most important thing in life..........common sense. I know some dumb *** people who went to college, sure they know their profession but so do I.