I believe the exact number was 28 PEAK HP gain over stock (258 RWHP stock and 286 RWHP after tuning IIRC), but that was over 8 years ago and many, many mods ago so I may be off by a HP or two. Either way, it was just under 30 HP gain with the tune and the other bolt ons.


The only number I care about now is 450 RWHP, since that's what my last dyno sheet says I'm making now (well back when I had the SC installed).

 

I was talking to a local builder here about a single turbo set-up....just to be different form the other SC and TT set-ups lol. Still figuring out what the best way to go about it would be to ensure I'm covered on the reliability front. Running that on stock internals?

 

Yup, I have yet to open up this engine, so all stock internals for now. Only the fuel system has really been modified and that's just a set of Denso 600CC injectors and a Walbro 255 lph fuel pump. We did test the car with 11 and 12 psi pulleys to get some dyno figures since my car was the test mule for this system, but I decided against leaving it that way for an everyday driver with stock internals. Plus the additional air would have just about maxed out my fuel system. The set-up as it stands now is very safe and I have almost 50K miles on it. I've recently purchased a set of Deatschwerks 750 cc injectors and 300 lph fuel pump because I got a great deal on them. These would allow me to run 12 psig of boost or more and are also e85 compatible. But I'm still unsure if or when I'm actually going to use them.


My first foray into FI cars was a 1990 Eclipse GSX I had back in the early 1990's. I had several different turbos on that... Including the large 16G and a 20G (monster turbo the size of your head). That car made almost 500 HP out of a 2.0L engine with the 20G turbo at 24 - 25 psi of boost (plus lots of other supporting mods)! And what I can tell you from that experience is that a single turbo that is large enough to support that kind of HP is going to have quite a bit more turbo lag than two relatively smaller turbos. Although, Honeywell Turbo Tech (formerly Garrett) is one of my clients and based on what they are doing with their products the new turbo technology has come a long ways in the past 20+ years. Which is making turbo lag a thing of the past.

 

Oh, and just to draw out the intake conversation even more because I just love talking about this stuff... Back when I installed the K&N typhoon intake on my car (first mod for the car because I didn't know any better) I made some custom cold air boxes for it... just for the hell of it. Although they did turn out nice, looked good, and the filter area actually stayed pretty cool I didn't get any measurable gains from them and the intake pipes still heat soaked terribly.
Here's a pic of the complete air box.. I have many pics of the entire construction of these and there should also be some dyno numbers posted on my K&N intake thread over on G35Driver from way back in 2008. LOL

 

Yup, when all is said and done if people buy an intake for our cars feeling they are getting a true/major performance mod then they are going to be disappointed. But if you go into it looking for better sound (that visceral feeling), nicer looks and just maybe a tiny, if unnoticeable performance gain then you'll be much happier with your purchased.


And, if people are actually looking for true performance gains on the street then they should look at swapping to 3.9 or 4.083 gears... Right, Rochester?!?!


https://www.myg37.com/forums/g37-sed...6mt-sedan.html

 

Pretty sure if you've an aftermarket FI setup, then you want tall gears... not shorties.

But I don't know chit, man. I just drive around my neighborhood and make noise.

Shame about those heat shields. Looks like some nice fab work.

And as much as we mock intake kits as a "performance mod", let's take a realistic step back and appreciate how it's the gateway drug for a LOT of people, as their first foray into modding, because of the inexpensive, DIY nature of these things. In that respect, an intake isn't that much different from a FSTB. They're both genuine performance mods, but just barely.

 

Here you are claiming the engine cannot even handle the amount of air produced by the stock intakes.

Yes, it is a scenario that provides even more air that surprisingly, the engine can handle.

The intakes are part of a kit that greatly increases the amount of power in the car. I'm not trying to justify anything to you. Hell, I cannot even get you to understand that the engine can handle a whole lot more air than what the stock intakes provide so I am done beating this horse.

 

You say you don't know chit, but that was very well put!

Thanks. I spent a lot of time on those heat shields and rocked them for a year or so until Takeda used my car for their intake testing. I've since gave it to Hexotic with the intake, but unfortunately the later model G37's have some sort of relay box that interferes with the heat shield so he wasn't able to fit them with the intake.

And yes, I will have to agree with you about the gears with an FI setup... The car already accelerates fast enough off the line that the traction control thinks the tires are spinning even if they aren't.. But for an N/A car the regear seems like a significant performance mod, especially if you do a lot of city driving.

 

This thing? https://www.myg37.com/forums/g37-sed...-overkill.html

You don't need it.

 

Yup, that's the one. I like your solution for removing it.. I would just make sure it is sealed off from the elements as dust and dirt have a tendency to make relays stick (or not work) if they aren't the hermetically sealed type. Odd that the earlier cars don't have it. From the looks of the cover that's the relay for the alarm horn... Makes me wonder where my alarm horn relay is.

 

I bought my car with K&N filters on it already. I have a 6MT and my dad has a stock 37x. Only difference I notice is it sounds a little deeper around 3k revs. It doesn't seem any different other than that.

 

let me explain this simply - a normally-aspirated car will draw X amount of air. if the stock airbox is restrictive, it will not be able to draw X amount of air.
i am saying the stock intake can provide the X amount of air needed by the engine, and probably more, because it would be stupid to design the stock intake to be restrictive and choke the engine. the stock intake is also designed to be quiet, so the smoother path of a CAI may be where a few extra hp may be had, but the typical CAI tube metal construction isn't as good as the plastic as far as heat, so ... ???


define "greatly".

handle, yes. UNLESS YOU ARE FI, THE STOCK AIRBOXES CAN PROVIDE ALL THE AIR THE ENGINE IS ASKING FOR.

 

The lag was my concern. Think a twin scroll would make the lag minimal? It would be a Precision turbo used. I believe that's what the shop uses on all their builds but a single scroll would be brutal. My only concern is they primarily do Honda and Acura builds but have done a few G35s and they don't have a RWD/AWD dyno so that threw up some red flags in terms of experience. No doubt, if I had a Honda they could make it a monster but the lack of VQ experience leaves me with doubts.

Those DSM platforms were pretty impressive for their time. I was considering getting one as a small project car but everything local is absolutely beat to hell. Especially the Talons (again, because different).

 

Now you are talking about how much air the engine NEEDS and you are still ignoring what you originally said about the stock intakes providing more air than the engine can HANDLE. For the umteenth time, that original statement was wrong so let me explain this as simply as I can. It was wrong because the engine can obviously HANDLE more air via turbo or supercharger.

You also contradict yourself in this paragraph by claiming the stock airbox could not be restrictive because that would be a stupid design. But then in the very next sentence you claim it has restrictions since it is designed to be quiet and a CAI has a smoother path. But I digress. Let's focus once again on your original statement that the oem intakes flow more air than the engine can handle.

Hallelujah! I think you are finally starting to realize you were wrong without admitting it yet.

Nope, I was wrong. Here you go again trying to change what you originally said. Below is your original quote. Just admit the engine can clearly handle more air and lets move on

 

Rule #1 on MyG37.com: never ever get into a p1ssing match with 4DRZ about who is right and who is wrong. You fall victim to one of the classic blunders, the most famous of which is - never get involved in a land war in Asia.

In other words, he's relentless... and usually right.

Of course, by the time it comes to that, it doesn't really matter anymore, LOL.