RJ MFG Supercharger kit Feeler...

NRGz

Thanks for itemizing stillens kit and needed upgrades to make worth the money. I have tried hard to remember everything that people upgrade (or needed to upgrade and/or replace) excluding the a2a.
Just curious, is there more to add to that list?


What youve listed for stillens is just about 10k excluding install (if shop does it).

Im really hoping the whipple will come out to under 10k still-out of the box, to tickle my pickle




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TopgunZ

That is pretty much everything unless you want to upgrade to E85. Then you would need 1000cc injectors and maybe a larger pump. But with all of that you will be around 525 to 550whp.

*Edit*..... BOTH of these kits will require cat removal for test pipes also. Well, unless you just want for the imminent blown cats.

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Jayhovah

A lot of folks holding their breath for this.... not sure I understand? For the "sub-10k" price tag of this kit - couldn't those of you with M6 tranny's (or built 7AT) just go TT? Not bashing, just wondering.

I suppose the installation difficulty and/or labor charges for this kit would be cheaper, but it also will require body work and performance intakes.

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TopgunZ

I didnt want to start turbo talk either but MT guys could get the BP kit and install it in a weekend no doubt. Some could do it in a single day. I advise MT guys that call me asking about 500+whp on the stillen to just give Sasha a call..lol.

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MadSciSnails

The allure of this particular kit to me is its simplicity in design. I drive my z34 more or less daily. I feel the overall design will be more forgiving on a regularly driven car. The price point isn't that big a factor. Simple is reliable. Use your existing intake setup. Minimal plumbing and wiring modifications necessary. That's the way I picture it at least. It's all speculation until we see this thing.


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Chuck33079

Well, power delivery would be completely different. This will be insta-torque. A pd blower usually just feels like a MUCH larger NA engine. Plus, blower whine is awesome.

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bcfromfl

I'm not one to condemn innovation, and I'm interested to see where this project goes...although the potential hood issues (and impracticality of pleasing a variety of different Z owners) may keep this within a narrow niche.

I've pondered why turbos seems to be a more popular performance option for this car than s/c, and I think it's just a raw numbers thing of more hp. If you enjoy competitive drag racing, then that's another reason to go turbo. But if the car is a daily driver, or otherwise just gets used on public roads, s/c is clearly the better choice, with its superior power band, and as was mentioned above, closer in feel to a NA engine. I owned a turbo car years ago, and did not like the power band.

I know there are also enthusiasts who like things LOUD and to announce what's under the hood audibly, but there are also others (me included) who like to remain anonymous, and not annoy the neighbors!

cooltoy

with everything said.

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Chuck33079

The reason you don't see more sc cars around here is that Stillen was the only option other than GTM/Gamma, and until recently the Stillen kit was problematic (to be kind). The A2A setup fixed all that, but it's only a recent product.

Turbo cars from years ago don't really compare to today's setups in terms of driving feel. In your other thread you mentioned your experience was with a 1980's 4-cylinder turbo car. That cannot be compared with what a Z feels like with a turbo setup in any meaningful way. Most of the drawbacks you mention simply do not exist with a properly designed turbo kit. The sc isn't a clearly better choice, it's just a different option.

I'm also not sure what you mean with your last comment. Are you saying that turbos are inherently loud? That's not the case unless you dump everything to atmosphere, and most don't do that. Other than some whooshing and the BOV, they sound a lot like a regular Z with a mild exhaust.

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bcfromfl

You've got a great memory!

What I meant was kind of a general comment with respect to BOVs and including exhaust systems, too, but if I choose a FI option for my car, it would definitely have to have a quiet BOV...that would be a deal-breaker for me. Some of the noise experiences I've read in this forum would be intolerable.

Also, I've compared many dynos between turbo and s/c Z-cars, and even the best TT systems still have at best a 500rpm disadvantage when torque starts to advance.

Chuck33079

If you rode in a car with the BOVs plumbed back into the intake and the wastegates plumbed into the exhaust, you'd be amazed how little additional noise there is. Turbos make great mufflers.

A sc setup will make its own noises. Centrifugal scs have the same BOV issue, and a pd will have a whine. Granted, blower whine sounds awesome to many (myself included), but whatever FI route you go will have some additional noise.

Back on topic though, if what you're looking for is a flat torque curve and great throttle response, a pd blower is what you're looking for.

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Btalont

My interest has been peaked on this since it first came out. I've turbo'd everything from a Pinto(dating myself now) to my Bullitt Mustang (700HP all forged). Have done Mitsubishis and my daily is a turbo Veloster. As MadSciSnails and Chuck 33079 noted, the simplicity of not having to change exhaust manifolds, coolant/oil plumbing and all the other details that come with a turbo install is enticing. Also typically a lot less heat under the hood. I too have noted at the front of this kit announcement my issue with having to change or modify a hood puts me on the fence.

Ape Factory

I think it'll be imperative to have a proper LSD and not the VLSD so budget another $2K on top of everything else. It seems to be so true with this platform, need to pay to play.

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bullitt5897

I understand where you are coming from. But lets break this down... Not to be combative but to critically look at the argument.

Stillen kit = $6500 new *This is the tuner kit and thus only comes as a bare minimum. This isn't an apples to apples comparison. More accurately would be to compare turn key to turn key kits Stillen starting at $7100 on sale from $8200
A2A w/ Tial = $1700
Ecutek and Map sensor = $400 *More like $450 after all said and done just for parts... Now you have to factor in a retune ~$800-$1000 for a decent tuner
Si trim = $400 *For the Si trim now you have to factor in labor... so there is a couple more hundred dollars added.
9psi pulley = $120
Return kit = $750 *now you have to ditch the fuel system from the stillen kit to upgrade to one that will handle 500+whp... That means bigger injectors and return system... More than $1000+

Total = Just under $10k * A realistic total would be well into the $12k+ range... And a hacked up kit to make it do what they promised from the get go!

RJM kit = for sake of argument $9,999.00 MSRP *Turn Key! no changes needed no upgrades needed... simplicity in its finest.

OPTIONAL:
Hood = ~$600 (FRP) Optional yeah you can buy the hood or cut the factory one...
Shipping for hood = ~$180
Paint hood = $400 to $700
Look of hood = I am doing the design so it isn't going to be half assed or ugly. If I wouldn't put it on my car you can be sure I wont send it to molds...


Here are some other things you guys haven't taken into account...
-Cost of manufacturing. (I can tell you the RJM kit costs probably double if not more than the stillen kit to make.)
-Quality components: stillen uses cast parts where as RJM is all billet. Also the water pump alone for the RJM kit costs $500 and has a life of over 3400+ hours!!! It will last longer than the water pump in your motor! think about that... The guys at RJM want the kit to last longer than your car!
-Ease of installation RJM wants the everyday DIY guy to be able to install this in his garage.
-As you mentioned Scalability. Yes they could have built a cheaper kit. but that leaves you in the same situation as GAMMA and STILLEN buying all these parts to make them do what they advertised to do. RJM are a bunch of VQ owners they know what you guys want and I can tell you the difference between stage 1 and stage 2 is not much $$$... They built this kit for you to grow into not have to replace everything...

I know this because I am on their development calls and meetings. I am often the voice of the forums and if you guys bring something up it is most definitely heard in the development meetings. They have them every week... Yes the hood is a concern and they have been 3D printing like mad men to mock everything up. They have talked about adjustable motor mounts or new motor mounts but that goes down the slippery slope of adding more cost overall... Because now the every day guy cant install it in his garage... Honestly from all the input they have taken plus the preliminary flow testing you guys are going to be pleasantly surprised.

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bullitt5897

Their stage 1 kits will come with intakes. Or you can use your stillen or as I prefer the Admin Tuning intakes.

Yes you can go turbo. Honestly the only well designed twin turbo kit is the fast intentions kit. A fast intentions kit is going to run you $15k+ installed and tuned for a base kit... That is significantly more than the RJM kit plus they hit two different markets as brought up by many in here already.

What a lot of people don't understand is that the power delivery is completely different. You have more power under the curve in the PD supercharger setup and that at the end of the day wins races!

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