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Need your thoughts and/or advice on the new HKS Rotrex supercharger for the 350Z.Thinkling of getting the wife a new mod for her car.
 

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I just saw it in the new superstreet mag. **** looks so **** clean i havn't heard too much about so sorry can't tell u much.
 

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I like it, but im not too keen on the price.. if you are going to spend that much you are better off with the greddy TT.
 

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Originally posted by rev1k@Oct 11 2004, 05:00 PM
Need your thoughts and/or advice on the new HKS Rotrex supercharger for the 350Z.Thinkling of getting the wife a new mod for her car.

You should contact 350zspeedracer at My350Z.com. He had it installed, and performance was dead on with what HKS published. He said there was a good amount of power from 2000-5000. After that it dropped off almost as quickly as it began. It's a great kit for the street, and the price is actually lower than the MSRP. Avalon Racing has it for ~$5400.
 

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There's a good article in DSport magazine. After reading it and if HKS gets CARB approval then I'm sold. They made it a point to caution against getting any kit that makes above 380 whp without replacing the connecting rods.
 

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Another good read in November's Import Tuner Mag. Peaked out at 316.6 hp and 306.8 lb-ft of torque. Listed cost at $7250 which is just a tad less ($250 MSRP) than the APS kit which has much, much higher gains.
 

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According to 350zspeedracer at My350Z.com the kit failed in 4 days.

Jason - Why is it more complete than the other kits?
 

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Originally posted by TrackZ03@Oct 12 2004, 06:07 AM
Another good read in November's Import Tuner Mag. Peaked out at 316.6 hp and 306.8 lb-ft of torque. Listed cost at $7250 which is just a tad less ($250 MSRP) than the APS kit which has much, much  higher gains.

How can this be only peeking at 316hp that would only be a gain on 20 some hp.
 

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Originally posted by pumpedva@Oct 14 2004, 11:01 PM
How can this be only peeking at 316hp that would only be a gain on 20 some hp.

The hp listed is at the wheels. Original dyno on this particular Z was 237.4 whp, so this is about a 79 hp improvement. I'd go w/ the APS for the money spent.
 

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Originally posted by TrackZ03+Oct 14 2004, 09:17 PM-->QUOTE (TrackZ03 @ Oct 14 2004, 09:17 PM)
<!--QuoteBegin-pumpedva
@Oct 14 2004, 11:01 PM
How can this be only peeking at 316hp that would only be a gain on 20 some hp.

The hp listed is at the wheels. Original dyno on this particular Z was 237.4 whp, so this is about a 79 hp improvement. I'd go w/ the APS for the money spent.

sorry I didnt know you were talking about the wheels. I was thinking crank
 

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I'm not sure it was a kit failure per say in that speedracer's description said the screw broke. Now if HKS provided a weak screw shame on them but I would also check w/ the people who installed the kit.
 

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The HKS supercharger and the Vortech supercharger were both written up in this months Turbo magazine. The gains of the HKS kit were substantially less than the Vortech kit, and the Vortech kit has *much* more time in the field. While the install looked really clean, for the money, I don't think it's worth it. I'm sticking to my guns on the Vortech kit.
 

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It would be interesting to see a tuned HKS kit. I would have to assume all the examples we have seen is the pre-tuned kit from HKS where all the Vortech installs have been tuned by a tuner.

From the dynos we have seen of the HKS kit the top end is where it is lacking but is this because of the pre-tune from HKS. We will only know when someone decides to tweek the HKS unit and then we can compare apples with apples.
 

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My Vortech kicks a$$ and its not even tuned yet! R4 coming soon!
 

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Originally posted by [email protected]@Oct 14 2004, 01:46 PM
my favorite and most complete supercharger kit to date!

I'd have to agree somewhat on this one. I just read the latest mag with a tuned HKS kit on the Z. The kit comes with EVERYTHING, including a 35 page instruction manual. I would almost buy one for the discounted price that Avalon is offering and do it myself...if I had the money. Maybe that will be my winter project - saving money for it.
 

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Originally posted by MR RIZK@Oct 20 2004, 07:05 PM
It would be interesting to see a tuned HKS kit. I would have to assume all the examples we have seen is the pre-tuned kit from HKS where all the Vortech installs have been tuned by a tuner.

From the dynos we have seen of the HKS kit the top end is where it is lacking but is this because of the pre-tune from HKS. We will only know when someone decides to tweek the HKS unit and then we can compare apples with apples.


Micheal, I think you will find that the HKS unit will be very limited in it's future power increase capability when compared to the bigger centrifugal superchargers (Vortech and ATI) as the rotrex/HKS unit has very limited mass air flow increase potential.

From what I have seen on the rotrex S/C previously (have used them on holden and Ford V8 engines) I think you will find that the HKS S/C will have superior low rpm power though from there on in the bigger centrifugal superchargers will produce the best power in the mid to high rpm.

Would be very interesting to see the torque and power curves of all of the popular S/C systems on the identical fuel octane and tested on the same day and dyno. :thumbsup:

Peter

APS
 

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Peter,

This is true. I have done some calculations on the Rotrex unit and the amount of improvement available to stay within the rotational impeller limits of the parts. Basically their is not much room. HKS has modified the standard compressor housing with their own trim but IMHO I also think it will never flow enough to match the ATI/APS/Vortech kits if high HP is required. Unfortunately I cannot get my hands on a flow map of the modified unit.


Michael
 
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