JRCivic1

Unfortunately, it is NOT CARB legal.

Autoworks

Yes, the kit bracketry will physically fit the B20B just like it will fit the B18A/B.
It certainly would not fit a 2.0 Prelude motor.

It isn't carb legal.

Mike457

Of course.

Balor_Gr

Mate the title claims " unbelieveable gains " .So no im not hijacking.
You posted a dyno and im commenting on the result.

b20bswapej8

you mentioned you did a b series an are gonna do another b series with the kraftwerks sc kit. have you dont a b20b low compression with the vtec p72 gsr head with the kraftwerks sc an if so whats the potiental power it could make with a mild build from top to bottom with a good tune an running 93 octane? im curious because im actually getting ready to start building my b20b low comp with my p72 gsr head an was just wanting some inside on the numbers i could possibly produce thank you for your input its greatly appreciated

JRCivic1

Motorvations Motorsports is well versed with the Kraftwerks/Rotrex Supercharger system, and has built and tuned LOTS of "B" series VTEC applications including some B20VTEC combinations. They commonly produce 170-175 WHP MORE than what the engine makes naturally aspirated. Since you want to use pump gas, I suggest you keep the compression moderate... flat top or mild dome (like PR3 or ITR style) would make the most power safely. They can really help you... give them a call. If you are in Louisiana... they aren't far away from you.

b20bswapej8

what the best efficent compression ratio with the best hp gain

JRCivic1

Something between 10 and 11 to 1 will be what you need for pump gas. Again, I suggest you consult with an engine builder and supercharging specialist.

sikefcrx89

iTrader: (1)

I know the old ERL website doesn't work,and there facebook page hasn't had anything since 2017. Is the number still the same?

JRCivic1

Unfortunately not. ERL closed last year. Motorvations bought their remaining inventory. Not sure what they have left in stock, but you can give them a ring and check.

Bseries95

I am about to buy a kraftwerks b series supercharger kit was wondering if I needed to stick with the b18c1 crank pulley or could I run a ATI street crank pulley (918476) its basically a b20 crank pulley what benefits or issues would I come across ?

Darell Randolph

Not sure if it's cool to post here but this is my self built B series kit using a Rotrex C38-81 that retains ac. This was a used blower that was thought to be damaged beyond repair by the previous owner, I replaced the internal bearings and have had no issues with it since. Most of the accessories are eBay junk as I had no clue how well the system would work considering I threw it together in my garage. Made 330/218 on a conservative 10psi on 91. I road race it and beat the hell out of it on the weekends, never had a failure. Shares a 4 rib belt with my AC compressor and has a 110mm drive pulley. Motor is a %100 stock '96 JDM B18C type r, plm today rep header and Tanabe Touring Medallion header back. Just upgraded the s300 to a V3 and will be returning on e85 later this year.

JRCivic1

Belt choices are super thin... increasing your crank pulley diameter that much may put you out of reach for a belt. I would try to stay closer to the size of a GSR crank pulley so that you can get a belt that fits. This system is still very uncommon compared to the older JRSC kits or turbocharging... so answers by individuals like me who own a kit are going to be scarce. I recommend, as I have above, to contact a shop that SPECIALIZES in this system. They can help... and answer all of your questions.

Chance EG

Nice Darrel. Are those the Procharged mounting plates?

JRCivic1

Very cool Darrel. It is a shame you had to cut up the front corner of the car so much to make it fit... but I really dig that you kept A/C (and P/S if you wanted to).

Darell Randolph

No, not a procharger mount. There is a company that sells sheets of aluminum predrilled for various Rotrex blowers on eBay. They were a Porsche specialist iirc. They sell the sheet and you have to figure the rest out yourself.

Yeah, hacking up the frame rail was painful. But I spent about $1300 total to build the kit including tuning so it was cheap and I roadrace it much more than street drive. Also, after removing the washer fluid bottle I had plenty of room for the blower. The oem fender liner is still in the car but it was a chore to remount it and it required some cutting and snipping. Most people have no idea it's supercharged unless they hear it or spot the front couplers for the intercooler.

JRCivic1

$1300 total ??? How much did you pay for the supercharger itself ???

Darell Randolph

The previous owner thought it was beyond repair so he traded it to me for an S2000 trans with a bad synchro I had lying around. Worked out great for us both. I used an eBay intercooler and piping, purchased a walbro 255 and some rc1000's, added a cheap 1" bypass valve, and put a transmission cooler the size of my Mishimoto radiator to keep temps down on the supercharger oil. It's a hodge podge of really cheap parts as I honestly didn't think it would work. But it has been in the car for 6 months or so and not a single hiccup. The only real drawback I have is that the supercharger itself sits nearly flush with the oil pan, I wouldn't suggest it for bad roads but I haven't had any trouble. When I tuned it there was a snow storm, I drove it to and from the Dyno.

JRCivic1

That was a fortunate score on your part. The supercharger itself is pricey... like a high-end brand name turbocharger. Getting one for pennies helps keep the budget small.

I am about to up the power on mine. Check out my build thread to see more. https://honda-tech.com/forums/forced...hread-3285501/

Balor_Gr

Its almost crazy that the setup did 500hp on a 5-rib ( is that rght ) belt.

wunfstgsr

That's awesome! its mounted in the same location as my Procharger kit, I have a extra mounting bracket I was toying with the idea of doing the same if I ever found a CCW blower to use.

JRCivic1

I am using a 6-rib belt.

Balor_Gr

But the honda crank is 4 or 5 rib if i remember correct. You changed the pulley on the crank to a wider one?

2001GSRSC

"Shares a 4 rib belt with my AC compressor and has a 110mm drive pulley" Quote, Darell this is driven off the A/c snout? I might have misunderstood that.

That is awesome. The JRSC is driven off the Alt., but you are doing it from the AC compressor. Those centrifugal blowers are the hot ticket, better ADB efficiency, more compact. Kind of a hybrid best of both worlds forced induction, goes without saying. I never even thought to try that, with a Kraftwerk type. So it can be turned 'OFF' to save fuel with the A/C clutch for cruising? How does that work out, any A/C clutch failures from the load?

JRCivic1

The factory crank pulleys have a 4-rib groove for the A/C location that would normally be used to drive the Rotrex supercharger in the Kraftwerks "B" series kit... however, Motorvations offers an exclusive "big power" Rotrex race kit which includes a custom replacement crank pulley with a 7-rib groove for the A/C location... and that is enough belt to turn the big supercharger.

Nope. The supercharger goes in place of the A/C compressor in the Kraftwerks race kit... and in Darell's case above, his custom kit would place the supercharger pulley between the A/C compressor and the crank pulley and is driven by the same A/C belt.