418whp/311tq Once you change the injectors the mpg doesn't read right any more. It's not much different if you drive it calmly but that is very hard to do! If you jump on it you can watch the miles to empty drop by 10-20 almost instantly.

Another good reason for you to use a custom tune is so you can tune the 7AT. You can make it shift much harder and faster at high rpms. This will make it feel stock when just normal driving but when you are on it the car will shift much faster.

I was only considering the Stillen one because I thought it might be cheaper for them to install/tune it if I bought it from them, but that's not the case so if I do it, I will def do a custom tune.

I am a noob so bare with me. When you guy say blown or popped, why would this happen? I understand the 7at not holding up with the higher power, but turbos make way more than the SC kit even with the impeller so what is it that is breaking?

I'm curious since I thought an impeller could be an upgrade for the future with some 7at fortification. Is there somehting else I should be worried about with this kit and high power numbers?

Guys that have done both the 9 lb pulley and impeller have had trouble with blown motors but seem to be fine with one or the other. Mine is the stock Stillen kit but I'm upgrading it if Stillen releases A higher output kit. My 7At is bone stock (besides UpRev tuning) and I have beat on it for over a year with no signs of problems yet.

There are a lot of us that would love to know what exactly caused the problems! I would love more power but I don't want to be on that list!

JWillis is right if you stay on the 8PSI pulley you should be, SHOULD be fine, I made 412 WHP and 320 WTRQ on their "stock" kit custom tune of course. I then went for 500WHP and the motor quit at 457 WHP and 330 WHTQ @ 12 PSI. I was seeing 9 PSI on the stock set up, An I only did the impeller upgrade but had all the fueling upgraded and UPREV mafs. You'll need only the heat exchanger if you plan on staying at 8-9 PSI.

If I could do it all over again I would have stayed t 412 WHP and be still driving it and not looking to buy another one :(

Same boat as you, my kit was just fine at 430WHP and then when i upgraded the kit, motor gave out at 510WHP (ran meth as well), leave the kit alone and enjoy the car, the extra 50-60hp not worth it for the amount of the long term headache you will go through TRUST ME!

Thank you both! I'm sorry for your troubles but you guys posting your trouble kept me away from getting hung up on the numbers!


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I appreciate the info too. My SC kit gets installed next week.

I see you live in AZ, start thinking about cooling! Good luck with the car!

I already have the 34 row oil cooler and the transmission cooler is getting installed with the SC. I planned ahead. :) When the temp is under 70 right now it has trouble reaching proper temp. I am sure FI will change that.

That should work as long as you don't drive in a lot of stop and go traffic and don't plan to track it.

Are you saying a 34 row oil cooler won't be enough for stop and go traffic or tracking?

It's been more than enough in 117 degree weather and stop and go. But maybe I am just lucky.

I currently only have a 25 row cooler, wonder if that would be enough

It won't if you track the car.

With a 34 row in the summer on track n/a the car can easily hit oil temps of 240-260 deg at places like Sebring or Roebling.

Hey man its an awesome kit mine has 40k miles on it and I still make 440whp. 315trq. I have all the same upgrades. These guys are right you gotta go custom tune! I had uprev tune mine and it runs like a champ. Good luck man!

Mine is at the shop right now. I pick it up Monday after we tune it. (I like watching the dyno runs lol) I upgraded the bypass valve too. Of course getting it custom tuned. I am hoping for a safe 420 to 440 hp.

What upgrades do you have?

9 lb pulley 800 cc injectors turbosmart blov AEM methanol frozen boost front mount uprev tune and mafs. 3 " AAM cat back with test pipes. But I'm going back to hfc. I feel like this kit needs cats to perform right. Don't use the small injectors that come with the kit or the tune. You won't make power!

With the Stillen Supercharger is the performance boost from low to top end really, really noticeable? Like, should I get a raging hard on when I floor it? I understand there are some shortcomings with the current Stillen kit that can be upgraded. I own a 2014 sport/touring and from what I have read on the forums, I plan to buy a SC kit, UpRev MAF GT, HKS Spark Plugs, 775cc injectors (in case I ever rebuild the motor and go for more power), FI Exhaust, Z1 clutch and flywheel combo, Z1Oil Cooler, and the Frozenboost Heat Exchanger. I can do all this over the next 6 months working as a contractor in Afghaniland.

Alright, now with the stock block I know that running 93 octane I should be wary of trying to go over 450whp. Would it still be cheaper if I upgraded my engine and pushed the Stillen harder with more boost instead of going the TT route to achieve the same power? Even with a TT at some point you will have to upgrade the engine. Hypothetically, with an impeller upgrade and pushing 12 psi with a built engine what would be some results that you think I could achieve? Would it even get close to competing with any twin turbo builds out there?

Also, I know a lot of people have older Stillen kits, but for those who have purchased kits this year; should I still replace the BOV that comes with the kit?

From my understanding even with a build engine you won't have much room to grow in power with the Stillen supercharger even doing all the upgrades to the kit you might end up spending as much or maybe more than a turbo kit and still you won't get anywhere near the power of a turbo kit but thats just my opinion. Read what others have to say, they know a lot more than i do.

Yeah that is the vibe I am getting from all the threads I have read. The turbo kits are a lot more expensive and I would only go twin turbo. I see some people have good numbers with the stock setup. I would have to invest in upgrade to fuel pump and injectors. Depends on how much money I want to put down on this and how long I plan to remain in Afghanistan.

Hi Neil912
I can give in the spring of 2015 clear answers you unfortunately.
How much BOOST can we go to with "STILLEN" and what power comes out.
We/I go to the extrem and check out the Maximum of this Kit........

One thing is clear.
Want to get more power (over 500-XXX WHP),
then I think there is only the turbo option.

And if you want to take such power (safe), then you need to increase the engine.
(Long full throttle rides, extreme stress and racetrack operations).
The price for the engine updress is then equal! Whether Turbo or Supercharger! There are the "same" Options. Forced Pistons, Rods, etc.

This is my experience! (But only with the STILLEN- kit)


I hope I'm not stoned here ?!:ugh2:

Greetings Ivo :tiphat:

^Agreed that twin turbos are expensive but if you decide to go the boosted road you don't necessarily need to build the motor IF you're gonna stay at 500whp or below as long as you have a good installation and tune. Actually there are quite a few guys here that would vote against building the engine since its been proven to be pretty damn strong stock and F.I. and Phunk at CJ Motorsport have push this engine to 600whp stock

You'll never be able to come close to the amount of torque that a turbo puts down. I have the stillen SC with every other supporting mods that stillen makes and I'm at 440whp and 327tq with a custom tune of course. I'm happy with the kit however I'm going TT this winter via AAM's new borgwarner set up. I just want more power! I'll be selling my kit w/the 9lb pulley in about a month or so.

OK im diggin the sound of the TurboSmart 25mm BOV
Where is it installed in the kit and is there a special one i have to order ??

Swiss, I've seen some of your videos and your build and that really got me interested in the Stillen kit. Of course the price as well, but I won't be able to make a decision until around May. I will definitely look forward to your build in the spring and see what numbers and upgrades you put into your Z.

If I go TT then I am looking at Fast Intentions, but I am not sure if I should go stage 1 or 2. I feel like if I go stage 2 then I can put lower boost and use stock engine, but if I want to go higher then that possibility is there.

There's nothing from stopping you from running higher boost on a stage 1. Going with the larger turbos on the stock block will mean a laggier, less responsive setup than the stage 1.

Just call Tony at Fast Intentions.Great guy and the customer service is top notch. He will answer all your questions regarding your own goals. I know you said twin turbo only but you can always look into Boosted Performance single turbo kit also which is another top notch kit with great end results similar to the twin turbo kits, less expensive and much easier to install.

if you are selling your STILLEN, Keep it in the 'burg. I would be willing to make a deal with you.

Im selling a stillen kit ^^^

Plue for what nomodsjk said, the most I made was 457 WHP and 330( 3 days) motor said see YA. I had every mod you could have for the kit, Impeller ( 12 PSI) Injectors, pump, plugs, MAF's, heat exchanger and tune. The kit in the "Stock" form is safe outside that your asking for trouble, Just IMO I was shooting for 500 WHP, The Stillen will never get there. Like Swiss said for 500+WHP you'll need turbos.

With that said the kit is very good I really loved it. Most likely will have it again. Just wont mod it. 412-420WHP is enough LOL, For me anyways

Anyone ???
and how do you install this ?

It goes in place of the unit that comes with the kit

Here is the assembly area

http://www.the370z.com/attachment.ph...1&d=1419789595

http://www.the370z.com/attachment.ph...1&d=1419789672

The oil in the BOV and all, please do not note :eekdance::confused:

Greetings
Ivo

so a lot of people are saying not to do the impeller and 9 lb pulley. Is the general consensus that doing just the impeller is safe? What kinds of gains would the impeller upgrade make over stock SC kit?

We have about 20 hp more power reached only by the 928 impeller.
From 465 hp to 483 (not WHP).

OEM at the beginning was "a Little" over 300 hp.....:ugh2:

I have only the diagram without impeller!

http://www.the370z.com/attachment.ph...1&d=1420592431