^^my Ati crank pulley is up for sale. It is ready to ship. I am unable to create a fs thread because my home pc has kaspersky and is blocking this site due to a potential trojan. If u are interested, pm me.

 

Meth without a tune? I guess if u just wanted to take advantage of lowered air intake temps, but not advance timing it would be possible.

 

^ I wouldn't tune around a meth setup on track car but that's just me.

Thanks for the info jonnylaw. I based my opinion on the GTM unit off of the dyno numbers posted in this thread, and their build threads. I still think it is the GTM pulley that makes the additional power not the unit. Either way it looks as if 400 is the cap on this kit no matter what stage it is. I'm not bashing this kit at all, I love HKS.

That list I had mentioned above was hypothetical.

 

I thought GTM supplied a stage 0 kit which included the modified blower but I've just checked & they dont.

What I have found with the HKS kit is that there is no consistency on the figures, I searched for ages to figure out what sort of figures I would be making but in the end gave up because of the differences between them.

The stage 1 kit with the above mods "should" get you to the figures you want but every car will respond differently to the kit

 

what do you guys think about upgrading the IC?

 

Its something I've been looking at since before I got the kit. It can be done, just takes a bit of custom work to do it.

Theres a HKS demo car knocking around somewhere with a full length FMIC

 

^^Why are you guys thinking of changing intercoolers? Are you seeing high IAT's? The intercooler supplied with the kit, albeit on the small size, is stated as having minimal pressure drop.

 

Mainly for the looks tbh

 

^+1 lol and I was also told that in japan there is a track prepared 350z pushing ~500hp to the flywheel with our s/c system, but with an upgraded HKS blower and upgraded IC(stock block). Hopefully I'll be able to get them once I go JP by December

 

The bigger blowers are available, but the problem is they will not bolt up to our kit's bracket and piping (as far as I know). You will need new bracket (hardest to obtain imho), new piping, likely new pulleys, intercooler, etc. (i.e. a whole new kit)

So that car in Japan is not running our system. They are using a GT-SC but it is likely a GTS8550 or GTS8555. Thus they must be using all new piping, new bracket, etc. The only part that is likely the same as in our kits is the air filter.

But let us know, it would be awesome to get one of the bigger blowers and make it work instead of trying to squeeze any more power out of the gts7040 by overspinning it.

I very much doubt that anyone can surpass 400/400 at the wheels (SAE) on a dynojet with the GTS7040 (our kits) without overspinning it. It is only rated to 400ps (~394hp): http://www.hksusa.com/info/?id=3767 I have not seen anyone make more power than what I put down and this was only achieved by overspinning the blower.

I wish HKS would have given us a bigger blower, but their argument was that our stock blocks cannot handle more power long term...

 

You can special order the larger blower as a universal kit and custom pulleys from HKS Japan now:

http://www.hks-power.co.jp/products/...univarsal.html

I am assuming the dimensions are different and the 8555 would not be compatible with our bracket and piping, but I would love to be wrong.

With the yen/dollar conversion, the GTS8550 is about $3,200 and the pulleys are about $150.

I will try to contact a japanese vendor I trust and see if they can ask HKS japan about compatibility.

 

How do you know if the cats are gone? What are the tell tale signs?

 

You would have to perform an inspection? To know for sure?

 

But what would make you suspect the cats are done?

Reason i ask, is because after my service the car feels like its lost power in the lower rev range (sub 4000rpm) Doesn't feel as strong as it used to.

 

See this post

https://my350z.com/forum/8528064-post359.html

https://my350z.com/forum/8529189-post365.html

 

I am having a trusted japanese vendor contact HKS Japan's secretary of inquiry to ask if the larger GTS8550 will fit the bracket and piping made for the GTS7040 (what came with our kits).

I will post the answer once received, although may take a few days given translation and time zones.

If it is compatible, I may consider upgrading, although for ~3,200, I might just sell my kit and buy a turbo/twin turbo kit.

 

Ok, according to tech support at HKSUSA, the larger superchargers will "bolt up" to the piping (close enough but not exact given the larger size).

However, the main problem is the bracket on the complete kit is designed to "surround" the blower. So the larger blowers will not fit in this bracket due to the larger size.

So, you would have to shave down/machine the bracket to make it fit. But in doing so, you would likely lessen the strength of the bracket and there will be the possibility of flex.

So, it's not a matter of just buying a larger blower and swapping it out.

I'd be interested in seeing how this car in Japan achieved the setup--if the bracket was shaved/machined down or if whole new bracket/piping was fabricated.

 

Good info Johnny.

 

Keep up the good investigative work Jonny, this is very interesting.

 

I'm still waiting from HKS Japan. But the more I think about it and the more research I do on my own, I think the problem would not be in the bracket, but the piping and or room needed for the larger compressor section.

I believe all the GT SC's use a universal body where the pulley attaches and there are 3 bolts when it attaches to a bracket.

But the compressor sections are much larger on the GTS8550. I'm not sure how that would play out with piping and space available.

Pic of the GTS7040 and GTS8550: