1. You'd be physically limited to lower WHP potential, which may help you preserve your car, especially if it is a 7AT the A2W system isn't capable of making 7AT destroying power consistently.

2. You'd have the actual potential to make way more power than the A2W kit (with supporting mods) and then you'd be tempted into spending more money. But, the A2A kit is the best way to SC your car safely.

3. For the Stillen A2W kit? Yeah, people have done it.

I too have contemplated using just the Stillen A2W kit. But there are too many technical shortcomings with that kit (like very little thermal capacity in the A2W system which makes it difficult for the tune to keep up with the ever changing thermal limits of the A2W kit).
I don't need 500+ whp, which the A2A kit can do, but the kit more "easily" makes 400-ish WHP than the Stillen A2W kit which allows the tune to work with more consistent engine conditions.

 

Thank you for the honest response @ takemorepills.

Follow up question, with reference to the answer to question 2, what are the supporting modifications? Price on those mods?

With regards to the answer to question 3, as a follow up, is there a kit I should google for or what should I google. I tried searching the forum quickly and even did a google search but I did not see a thread with the answer yet.

 

Thank you for the honest response @ takemorepills.

Follow up question, with reference to the answer to question 2, what are the supporting modifications? Price on those mods?

With regards to the answer to question 3, as a follow up, is there a kit I should google for or what should I google. I tried searching the forum quickly and even did a google search but I did not see a thread with the answer yet.

Also, when answering the above questions please keep in mind that I mostly want to be able to do all of this on pump gas, 91 octane to be exact as good 93 is hard to come by.

I would like to eventually consider exploring E85 but at this time it is also very difficult to come by.

 

@ take more pills or @ rickbobby

Please let me know if you can give me some insight on these questions.

 

Here’s the thread you want. Where you can see the kit/order it, and also heaps of technical information.
Topgunz - air to air upgrade - Nissan 370Z Forum

 

I been on that one. Didn't see what I was looking for, specifically with regards to keeping the air to water temporarily and just relocating the MAF sensor.

In the thread it seems that they are basically "advertising" for the air to air kit.

I was hoping for say a $300 solution of just moving the MAF sensor to a better location. I think I have the upgraded heat exchanger. (keep in mind I am not sure because I bought the car already done as is with the supercharger kit)

 

You mean you have a frozenboost? You can just relocate your MAF sensor but not sure what help people can give you when you have to find a welder/fabricator locally to you.

 

#2 The Stillen Kit with A2W or the Topgunz A2A kit, in a low tune state (low-mid 400's max) Only needs some simple supporting mods. For example, you can run a Walbro 255 fuel pump without needing to upgrade the fuel pump wiring and you can maintain a returnless fuel system. This approach has proven relatively trouble-free for many people running boost (turbo included) and making moderate power levels.

The A2W kit gets very difficult to extract much power out of because the IAT gets to be all over the place at higher boost levels, the water HX system becomes hopelessly over-taxed and the ECU won't be able to correct any of that nor compensate for any of it. It's too much to ask for the ECU to deal with a heat-soaked A2W system.

However, the A2A and turbo kits have the potential for far more power. I'll just cover the A2A side of things, but regarding the fuel pump once you get into the higher HP potential of the A2A you need to seriously consider converting over to a return style fuel delivery system so fuel pressure can remain stable at higher flows. And of course even bigger injectors. In researching supercharger systems on 370z.com I have found those who have converted to return style fuel systems have occasionally experienced starting issues related to the upgraded fuel pump and return system. It can take a while to figure these things out. The Walbro 255 and stock fuel pump wiring seems to be the least likely to give issues, as long as you don't need huge HP from your boost.

And, obviously, other "supporting mods" such as coolers and transmissions come into play. Adding coolers, rear end gearing or needing to add LSD, addressing strength in the 6MT clutch or rebuilding the 7AT can add many thousands of dollars to your budget.

I would suggest you spend a few days reading around the 370z forums, not the G37 forums, to absorb the info you need to make the right decision.

Basically, to safely get to low-400WHP on the VQ37 with A2A is going to cost $8-10k depending on how much of the work you do yourself. Getting to 500whp will add many thousand more dollars to your build.

BTW, Topgunz recommends return-style fuel pump upgrades and 1050 injectors minimum because many of his customers jump right to E85. But you can certainly use his A2A kit with a 255 fuel pump and 650 injectors to keep things simple

 

The water HX in the Stillen manifold has several issues, and this is why people want to "move on" to the A2A kit.
The water HX is a restriction in the manifold.
The water HX can only move a certain amount of heat.
The water hoses can only move so much heat.

Just look at the size of the heat radiators: the A2A intercooler present lots surface area to ambient. The A2W system offers much lower surface area, therefore it will always heat soak.

If someone really wanted to do a A2W-type setup, I'd start looking at using the AC system to super-cool the heat exchangers.

 

If anyone needs 1050x injectors at some point reach out to me. I think for the power levels I’m about to go for I might be getting into twin pump territory and 1300 injectors so i could sell my 1050s. Maybe I could even sell my fuel pump/basket so you can avoid the work whenI go to the twin pump

 

How’s the build holding up?

 

Good. I’m messing with my clutch the most. Then I want to start running no filter/blower guard since the car isn’t a daily

 

Great to hear! I’ve posted a new thread in the FI forum. Would you mind checking it out and giving me some pointers? If not, thank you anyway I’ve enjoyed reading your thread!

 

Glad to hear Ricky!

The air to air was the right move?

Shop I am going to is recommending to stay air to water but to use a different sensor and use ecutek

 

so are you happy with supercharger and tune? i have 2009 g37xs sedan thinking about getting same got quote for 9500 plus 1500 for install. No tune...