Sr20gemini

Hi all

I have been lurking on here since my brother bought a hymee supercharger for his rx8.
We bought one of the last kits he had, we were told the reason he wasn't making kits any more was he was having too much trouble with customers.

After receiving an almost complete kit Performance Design stopped returning our calls and stopped trading.
Luckily I have access to the machinery needed to make the missing parts.

The supercharger was supplied to us with a pinched seal on the lay shaft, I had to pull it all apart to fix this.
While apart I realised how poorly machined and designed the kit is, I'm hoping that because our kit was one of the last that it's been made up from the odds and ends he had left. Some of the work was so bad you'd never put it into a production kit.

I have remachined the kit to a point where I think and hope it will work reliably and am hoping to have it running in the next few weeks.

I can start a thread with the mods I have done if people are interested?

Cheers,
Dan

wcs

iTrader: (2)

Wow
Welcome aboard.

Crazy story.

You need to wait ummmmm 30 days and have 10 posts I think before you can start a new thread in other sections.

You might get an exception for you post if you request it from one of the admins.

Try RIWWP or Alneilson

Sr20gemini

It's been interesting, thought I could have the kit running in a few days. Been quite a few months now. It's almost ready to turn the key.

kevinande

If what you purchased is any indication as to the rest of the products they were selling, it is no wonder they were receiving complaints. I hope you did not pay to much for it.

Have you and your brother made any engine modifications to the engine to handle FI?

ShellDude

iTrader: (12)

Oh yeah, his paying customers definitely did him in. I still have a 25' OBD2 to RS232 cable for his never delivered / even remotely functional tuning software.

9krpmrx8

iTrader: (46)

Welcome. The kit has a number of problems and they are not customer related. He had a lot of personal BS going on but that is no excuse for burning people.

Read all of this:

RX-8 Hymee Supercharger Install

hoss -05

iTrader: (4)

Welcome aboard. Look forward to seeing things shape up for you. We should be starting a Hymee build in SARX land very soon.

Sr20gemini

Cheers guys. I read as much info on here as I could find once we got the kit.
It was a lot cheaper, that's why I'm fixing it.

I have taken quite a few pics of the changes I have made. I'll start a new thread when I get a chance to upload all the pics.

Sr20gemini

At this stage it's a standard motor, racing beat headers, apex exhaust and I made my own mid pipe. Also trying to design a good air intake.

I just want to get the supercharger running reliably before we start leaning on it.

Sr20gemini

I can't get the page to open, does it work for everyone else?

9krpmrx8

iTrader: (46)

Yep, works fine.

http://rx8supercharger.webhop.net/pc...e/overview.htm

houstonrx8er

iTrader: (8)

should be interesting

Good luck man and post up some pics

Brettus

iTrader: (2)

You didn't say how you would be tuning it ?
Don't even think about using Protuner .
A piggyback is not a good idea because idle will be a nightmare .... search SKCs thread .
Mazdaedit will work ..................

ShellDude

iTrader: (12)

Andy has a new trick for idle, Bret… you takeover the VFAD ADC signal and the select can do it's thing. I've heard of it really helping settle down idle on ported setups.

But I agree.. if you can stomach MAF tuning, MEP is the way to go.

Sr20gemini

We have adaptronic to try and use the protuner to adjust the idle.
Adaptronic have used an extra idle solenoid to bypass the standard idle control if needed.
I am also changing the supercharger bypass valve, won't know how well it works till we have it running.

Sr20gemini

I still can't get it to work. Managed to find a cached version. Had no pics though.

9krpmrx8

iTrader: (46)

Weird, the links work fine for me.

Sr20gemini

Hi all, It's been a while since my last post. My brothers rx8 is finally running and driving.
It took a lot longer than I expected with all the mods needed to the supercharger. I also used a Bosch blow off valve as a bypass valve. It seems to be ok so far.
Then the exhaust ended up being too loud so that's been redone too.
There's still a few things to fix, there's a small oil leak under the supercharger somewhere and under boost the oil returning down the fill pipe gets pushed up the fill pipe instead of into the sump.
I'll have to relocate the oil drain, to somewhere lower down.
The car runs and drives great with the adaptronic. Still hunts a bit at idle so will have a look at bumping it up a bit with the protuner.
I have a heap of pics on my phone. I'll post them up soon.

Sr20gemini

This is all I have on my ipad, will post more soon

skc

Good to see a Hymee supercharger kit running. My kit has been in operation for the last 4 years and it seems to run well apart from the bypass idle issue and the leak at the back of the supercharger.

Danny, of Automotive Plus in Brisbane thinks there is a lack of bolts in the lower portion to allow sufficient clamping force to prevent it from leaking. The case may need to be redesigned to stop the leak.

Interesting bypass valve set up you have there. Has that stopped the idle from dying when coming to a stop from a high RPM.

I have learnt to give it a slight tap to the throttle or press the clutch very late when coming to a slow stop.

Keep us posted on your results. My car produced 200kw at the wheels at 8psi.

I also had to experiment a lot with exhausts to get it quiet and I had to drive my car with ear plugs on. The exhaust heat is immense and the average exhaust will collapse in no time. My first exhaust died after spending a day at the track, the stainless steel had turned purple and the welds had split.

Sr20gemini

I finally got the kit sorted, no oil leaks. I put extra bolts in the back of the case. Do you know where yours is leaking? I have pics of all the changes I have made.

This one was unbelievably noisy once the supercharger was put on. We ended up putting two rotaflow mufflers under the back of the car.

The idle is good with the Bosch bypass valve, every now and then it hunts a little but doesn't stall.
The adaptronic works well with the protuner bumping the idle up.

The car drove great, awesome low down torque. However the kit was supplied with the high boost pulley, 12psi and a standard rx8 engine don't mix.
So the engine is out of the car as the front plate cracked. Getting a rebuild with studs and some porting now.

Hopefully it will be back on the road in a couple of months

Brettus

iTrader: (2)

very true. 8-9 psi seems to be the majic limit for a stock block. The tune is important but any little oops that happens will mean.................. BOOM !


Yep ........ the casting around the front dowel is VERY thin .

skc

Sorry about your engine problem, hope you can get it back on the road soon.

Good to hear that you have resolved the oil leak. I get all my major mechanical work done by Automotive Plus so I have not seen the actual weak spot that causes the oil leak. Glad to hear that you have resolved the leak by adding extra bolts.

Also good to hear that the bypass mod works please provide more details if possible.

My current exhaust is similar to the stock in size and it is has a perforated pipe and steel wool packed. I also asked the exhaust manufacturer to add perforated baffles to stop the perforated pipe from collapsing. I also have a header, gutted cat and twin 2"pipes post cat with an resonator on each. The sound is ok however, it gets noisy under boost so the next mod will be J pipes.

Based on my current power I expect that once I go to a 12PSI pulley I would get around 230 to 240kw at the wheels. However, that will only happen after a rebuild and I am hoping my 12 year old car will last another 2 to 3 years before I get to the eventual rebuild.

Sr20gemini

It was the first full power run on the dyno, the car still ran fine. Just developed a pretty major oil leak as the dowel and crack is the main oil gallery.
No issues with the tune, the motor simply twisted too much.

Sr20gemini

The exhaust on this car is an apex cat back system. I cut the two back mufflers out and replaced them with 2.5" rotaflow mufflers. Racing beat headers and 100 cell cat with modified mid pipe. Sounds good, not too loud but can hear it.

I have pics on my phone of all the mods to the system, will transfer them to photobucket and post here.

For the bypass I machined up a fitting that blocks the air going along the supercharger plate and directs it all through the Bosch valve then simply welded fitting to the intake pipe to plumb back the valve.

I'll be changing the intake pipe though as the o rings blow out when running high boost.

I also had to move the oil drain to the sump, under boost the oil draining into the fill tube was being pushed back up the fill tube and going into the inlet and blowing the fill plug out.
I welded on a screw in plug and made up an oil air separator to keep the oil out of the intake. Also increased the size of the breather fittings.

So many mods, to something I was hoping would be a bolt on kit.
Nearly light at the end of the tunnel.