Luckily for me I'm in Florida so I don't have to deal with the issues Lee does so getting to my 370-380whp/330-340ft tq will be easier.

You have a PM.

 

+1

 

Ok I have questions about my particular kit... it has a Rotrex unit rather than a HKS spec'd one. What size is the damned Rotrex? I want to do a pulley upgrade but was told they're not the same(or at least I've been told), according to the Wiki page the recommended pulley is a 100mm but if you click on the link provided... it's dead. In the link you can also see a 110mm number so I'm thinking the kit comes with a 110mm pulley and the upgrade is a 100mm. The Wiki also referred to another intercooler for the 100mm pulley(msrp is 950.00) so I'm not completely sure WTF is going on now.

C38-61
http://www.rotrex.com/Home/Superchar...4-9229e3f6e922

C30-94

http://www.*********.com/wiki/index....percharger_Kit

Pics of kit purchased:

https://my350z.com/forum/turbos-nitr...injection.html

Theirs a shop in Miami that specializes in BMW performance that uses Rotrex kits and they having similar engine displacement and performance use C38's, HKS GTS8550's, and HKS 7040's. So for some reason I'm not buying the C30-94 as the unit and thinking it's the C38. I also referred to the HKS demo car kit that uses a GTS8550 modified unit.

 

< kind of confused.

So this is the pre-hks, HKS kit? I think Intense still has a link to this and the product info on their website. Unless they decided to update the site over the last few days.

 

They used the C30-94 blower on the first HKS sc version.

Side note, there was a recall on their main pulley for that specific kit. Make sure the previous owner had HKS retrofited the main pulley. I remember it had to do something with the pulley braking or it would tend to brake. I can't exactly remember.

 

Yeah you have the first gen HKS kit that used the c30 series like you mentioned. You can double check your dimensions against the spec on rotrex's site. HKS promised a few years ago that they will be releasing a new kit with the GTS8550 but it never happened. Not entirely sure why since the prototype model was on the market a few weeks ago. I highly doubt you will be able to fit a c38 in there as the physical size is way too different. Even the bracket on that prototype 8550 is also different then then one that comes with the 7040. I think you know but c38-91 is comparable to 8550 and c30-94 is comparable to 7040.

ActiveAutowerke has been making a lot of kits using the c3x rotrex for the e4x and e3x but they switched over to the hks ones for the e9x and some e4x, not entirely sure why but from browsing the bmw forums it seems that there has been a few instances of failure on the compressor. Anyways, there are some guys running the c30-94 with 85mm making around 10psi. Looking at the BMW platform is a great way to compare different blower since there are so many supercharger kits for it. I also highly doubt that you will find many guys with the same SC kit as yours. ESStuning also makes ones using the vortec which is great for a point of reference given the dominance of vortec sc on the VQ. I've done a bit of research on this because I've also decided to SC my car and went ahead with a c38-91. HTH.

 

I didn't know about the Rotrex(C30/C8) vs HKS(7040/8550) differences so thanks for that info. I saw the dyno numbers from the kit I bought and it's in the 360whp arena... does that sound like HP numbers from the C30? Pretty much everything I've read has put it around 315-320whp for a standard kit(which mine is). In that wiki thing I posted... there was mention of an upgraded intercooler for the 8550 kit, does anyone have any insight on that?

 

So i just bought the hks demo SC and yes the mounting bracket for the SC has to be modified to fit the larger 8550 unit. I can send you a pic if you want.. Does anyone know what traction oil is compatible with the HKS kits? HKS Sells their traction oil for 300ish..will the rotorex traction oil work?

BTW, I heard from a shop that HKS parts can still be purchased by US vendors, they will just have to be ordered from Japan..

gabe3d
how much are you boosting on your c38-91? The demo kit is suppose to be boosting 10psi. and they got 460whp. I think their bottom end was built. Sorry didn't mean to hijack..

 

I think that 320whp is from putting the kit on a stock car. The car that had your SC was running meth and I'm sure more mods that can augment the final results. So I don't think 360hp at the hub is unreasonable and too far off for a c30-94 to accomplish. However 5.5psi does seem a little low. By looking at the 8550 kit that crtan77 bought it doesn't seem like it was an IC really made for it since it had 3 openings. There are a lot of air to air intercooler out there so it shouldn't be hard for you to find one. How much boost do you plan to run anyways?

Congrats on the purchase, that was an awesome deal. The torque delivery on it is very awesome. Be sure to post your results on here when you are done. What do you have on your car now? Not sure on the oil but the HKS specs are a little more spinny then the rotrex. The drive ratio is 1:9.368 vs 1:7.5 and the max impeller speed is 100k vs 90k. I don't think the oil needs to be changed that often, so IMO better to play it safe with the HKS lube!

Boost level is undecided at this momment since my car is a little different given that it is a 4.1L with 11CR, my final setup though will be using water injection so I might have room for more boost. I'll make a thread or something when I get some results. I am very curious on the results of your setup, even if that car has a built bottom end the power will not vary much so your car should be faily stout. When do you plan to get it done?

 

Cool, I dont want to hijack flo-rida's thread so i'll create another thread when i get it installed.. mods are basic trying to get under 400 whp. for now till i build my bottom end.. currently HKS said it was boosting at 10.psi..but I'm trying to get a 7-8 psi pulley.. mods list headers, exhaust, hfc, plenum spacer, uprev, intake made 270whp..I have their 1000cc injectors but still deciding on keeping them or not..

Flo-ridaZ33
let us know how the install goes..and how much whp it makes.. thanks..

 

Just read this whole thread and don't get half of it. I have to up my research skillz yo

 

^LOL


Flo-ridaZ33, if the numbers are a bit high, it might be because of the dynapack too.

 

samsies

 

No worries broskie... this is good info for everyone. I may just get a 90mm pulley from Rotrex and see where I am in terms of boost. I'd like a couple detailed pics of your bracket.


The numbers posted weren't with the meth though... he added that after that dyno run. Does anyone happen to know what GTM's pulley kit bring the up to? According to their site 85mm,90mm, and 95mm pulley sizes are available. If 85mm is giving the BMW guys about 10psi, I'm thinking the 90mm pulley should be around 7psi? The wiki link had a part number for the intercooler which is 17300-272287 and when I looked it up, it's an air to air Type S core.

Your set up is going to be beastly man... are you using a GT kit as a base or all new brackets? I have the tech sheets for the C38 and C30... they're similar in size but the C38 is obviously larger

 

That is true too... I just don't want to overspin the blower or worse blow up my VQ.

 

Got to risk it to get the biscuit...uh yeah that.

 

LOL well if I do blow it up... It'll give me an excuse to rebuild the bottom end and get a bigger blower. After the INGS kit and HKS BBK, I'm starting to reach my budget for this build..

 

whats a budget

 

touche' Dan...

 

as long as you boost not higher than 10psi, you should be on the safe zone

Best of Luck man!