Stillen SC kit recommended upgrades?
 

So everyone knows the Stillen kit has some shortcomings. It is also the only CARB approved kit on the market. I know these things will void the CARD legality, but realistically, if you have a CARB map o pass smog, no one's going to know if you did anything that wasn't originally in the kit if you're pulled over so as long as you have the sticker or plate or whatever, you should be fine.

I believe some of the issues are cooling, some plastic parts and obviously the need for an custom tune. It would be great if those who have experience with the kit or are just knowledgeable in general to supply the community with recommended upgrades to the Stillen kit that aren't too $$$ so people can know what extra costs to expect and plan/decide accordingly if this is a route they want to take.

I'll start with some I have read in other threads and add what others post:

1. Custom tune
2. Upgrade impeller OR pulley
3. Upgrade TurboSmart 25mm BOV
4. upgrade plastic cog pullies
5. Frozenboost heat exchanger
7. Transmission cooler (especially for 7AT)
8, braided steel fuel line

Sub'd

Buy the black series, no updates requires then. LOL

He has a legit question. Leave the trolling for Stillen thread.

Be careful, the impeller and pulley has ended in some blown motors! For me the custom tune was a must but they have changed their tune so it may not be needed. With that said you will most likely get more power with a custom tune. That is the only thing I have done on your list. If you track the car start thinking cooling cooling cooling!

Was just going to say the same thing as JWillis, I wouldn't upgrade both ! either one or the other and then you still in that "Maybe" in pop range. The custom tune you will still pass emissions BTW I did in Mass, The "old" and say old cause still "says" they have addressed their can tune issue, But their old can tune was crap and super rich. The custom tune just leans it out and changes some timing , Nothing that would make you fail emissions. If I go this way again the only thing I'm doing is a tune and the frozen-boost heat exchanger

Great thread with some details and insights: http://www.the370z.com/forced-induct...aded-kits.html

I plan to add these details to the FI info thread so it is all in one location place.

I would suggest upgrading the heat exchanger to the frozenboost front mount which is a very simple install and not only looks awesome but really helps a lot with cooling. I also swapped my spark plugs to GTR ones which are also recommended but don't come with the Stillen kit. I dont feel the need to upgrade injectors either since you will probably want to stay with the 8psi pulley and I wouldn't recommend swapping the impeller unless you plan to upgrade injectors/UPREV GT MAF along with it but at that point comes the higher risk and expense of reliability which will ultimately be based on the tuning. I personally wanted to keep it as safe as possible so I did the following.

1. Stillen SC with 8psi pulley (Had the 9psi but went back to 8)
2. Turbosmart Dual Port BOV (For Sound :) wanted to replace the standard Bosch unit)
3. Frozenboost Heat Exchanger (Added Cooling)
4. Stillen 25 row oil cooler (Cooling)
5. GTR Spark plugs
6. Stock cats per Stillen's recommendation (Had FI RHFC's but went back to stock cats)
7. Custom Uprev tune (Highly recommended)

Since you're auto I would advise to also get a tranny cooler.

There's nothing more to say!
Thanks guys :tup:

If you want more power and information, then wait until next spring.
Then I can report here.....:tiphat:

No we need to know NOW. LOL :rofl2:

Orrrrrrrrrrrrrrrrrrrrrr.... You can buy the GTM stage 1 500hp kit that i have in stock :tup:

http://www.the370z.com/forced-induct...kit-stock.html

The OP seems to value the CARB cert, which GTM never got.

Yes, CARB plus I am a little worried about support from GTM considering their situation. But I also created this thread so people considering the Stillen kit would know and be able to plan for needed support/upgrades for it.

On the GTM side of things, 90% of items can be acquired without needing GTM if a part needs to be replaced.
But on the CARB side, Stillen is the only option currently.

Can you keep the crarshbar when go to the front mount frozen boost inter cooler? Any firmest issues etc when upgrading to this part?

I did have to cut the tow hook off but I was willing to do it for this upgrade which I really feel was worth it. No other fitment issues, it was pretty straigh forward.

You can either cut the tow hock off ( I did this also) or like Swiss and install it upside down lol worked for him ;)

Anyone know how lths and hfcs will affect gains with this kit? My friend was telling me those mods make more gains with boost. Wondering if the stock kit with frozenboost heat exchanger and a good tune added to these breathing mods could give me 425 whp 340 wtrq on a 7at.

Stillen says you will make more power with stock cats. You could get close, mines 418whp 311 tq on a 7AT but I'm also close to sea level. The 7 AT is rated for 300 tq so if you do it know you are playing in the danger zone and be prepared you could kill the 7AT.


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I thought gtm was the one making less power with lths. If I did this, I would be looking into FI's upcoming 7at upgrade.

Level 10 also makes one.

Level 10 PTS Nissan Bulletproof Transmission RE5R05A,RL4F03A,RE4F04A,RE4F04B,RE4R01A,RE4R03A,RE 5F22A

Yeah, but I can drive over to Fast Intentions.

Are they selling it now? Whats the price?

Nope, GTM kit with LTH makes the same power.
Neither kit can really take advantage of LTH/TP because they were designed around stock cats. The SC units just do not push enough air where LTH/TP provide a benefit for performance, now other benefits can be heat removal which is a positive.

So it would make more sense to lose them then. Does the install process of the Stillen kit in anyway save some labor costs on removal of headers? I know the CAI and m370 would come off as part of install.

I don't think it will save any time but they are offering the kit tomorrow on a special starting at $4,999. I'm sure it's the tuner kit at that price but still a good deal.


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They didn't specify the 370 kit starts at that price, just that their SC kits in general do. It could be one for another car. I am interested to see what kind of discount it will actually be. Since their regular everyday website price is already lower than 'msrp' who knows what number they will use at the regular price that this $960 discount is coming off of.

Didn't it have a picture of the 370z one with the price? I deleted it, I don't really need a second one and I have about everything else they had on the car already.


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Anyone have the newer Stillen tune? They are telling me they usually see low 400whp and low 300 wtrq with the new tune which is right in line with what I would expect with a custom tune. Can anyone here say if their newer tune is good enough to not need a custom tune?

I would always use a custom tune over a canned tune. No matter what you are told by a vendor, you will always have a better, safer running car with a custom tune.

I agree with Chuck, there tune may be good now but you are always better off with it dialed in to your car!


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Unless you are near Stillen and take it to them to work out.


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I am not far form Stillen, but I got a better install and tune quote from a very respected Z shop so if tomorrow's deal is amazing, I will go have it done there.

I hope it works out for you, I love mine!

How much power are you making with just the stock kit and a tune on a 7at?

Are there different sizes for the Frozenboost heat exchanger? Can someone link me to the one that work with the Stillen kit?

Hey Sir

There are 2 Versions of the "Frozenboost" Intercooler:

1. The small https://www.frozenboost.com/water-to...c651ef5f111e85

2. The Big-ONE (I think all use it, including me) https://www.frozenboost.com/water-to...c651ef5f111e85

Also, those of you with the kit, any increased maintenance or repairs over the long run or pretty much like stock (other than increased tire wear)

If it's only being used on the street the only thing it really adds is changing the oil in the SC and tires. Mine has been on for over a year and has 17-18K miles on it.

Curious how much power/trq you are making since you also have a 7at? And what kind of MPG also ( not a huge deal, but still good to have as much info as possible)