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Discussion Starter #1
Compared to the GT2835 set-up, how would the 2540R and 2535 compare? I'm wondering how much power should be expected out of those turbo's and what the spool characteristics are like.
 

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asdf

I was thinking the same thing...also..get two different a/r for the 2835's..one set for everyday driving and the other set for track when using nos
 

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I agree with the different a/r's but who wants to switch all the time, plus who needs all that top end, just my personal preference I would rather turn up the boost instead of change a/r. Anyhow, anything R is race and has more flow which is more lag but has a higher output then compared to it's sister kit i.e. 2540 - 2540R. So with that said here’s a basic breakdown. HKS2540s will flow 630 with a decent setup at like 20psi I was told. Basically anything smaller then the 2835s is supposed to have almost 0 lag. HKS sells a custom turbo starter kit including everything but the turbos. Then all you do is purchase the two turbos, and boom you have a complete kit. Only thing is, for more money your getting a smaller output twin kit. This board is all performance related mostly so you might get some gruff ;) but it would be a killer setup with minimal if not any lag.. and you'd have twins so go to a show and get some trophies..
 
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Now you see, for some reason I thought the 'R' designated it a ball-bearing turbo. Guess not. Thanks for clearing that up. So you would suggest going with the 2540 over the 2535 and others? I'm looking to break 6-650rwhp with cams and no nitrous. Would I be able to do that with the 2540's?
 

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PinkySwear said:
Now you see, for some reason I thought the 'R' designated it a ball-bearing turbo. Guess not. Thanks for clearing that up. So you would suggest going with the 2540 over the 2535 and others? I'm looking to break 6-650rwhp with cams and no nitrous. Would I be able to do that with the 2540's?
You might be right, I was looking for then otes I took but I couldn't find them.. but I know for a fact the "R" models have more lag so rightn ow your guess is as good as mine.. Yes the 2540s or the 2545s would be ideal. I believe the 2540s are at 600 or 620 modest estimate by HKS on a decently tuned MKIV. No nos, but you could do other things to lower lag and optimize the twin setup. If you choose to go custom twin email me.
 
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Discussion Starter #6
there are many happy Z guys using HKS 2530 turbos.
 

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Called HKS

Ok well I gave my buddy a call and basically here's the breakdown.

Don't want to go smaller then 2535, anything smaller then the 2835 has to have some weldeing/custom work done. The "R' stands for response, and the "R" turbos have larger inlets.

Here are the max power estimates for the turbos. turbo/twin
2535 max power rating 340hp/680hp
2540 can't run on mkiv we need a T3 flange
2540R max power rating 370hp/740hp
2835 max power rating 400hp/800hp
2835R custom work needed not suggested

With looking at the 2835 numbers I make the estamte that the numbers are from well tuned and decently high modified cars. With that said I concur with HKS that the 2540R would make the ideal twin setup to run. Makes enough power with much less lag then the larger 2835 twins.

*Notes
HKS only has a few turbo-less twin kits available in the U.S. so move quick. You can order a custom twin kit from Japan using whatever twins you want but the arivial time is unknown.

The 2540R's comes in two housings .64 and .86

Hope this helped you all as much as it helped me, I might post it as a new thread.
 

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Do you know what kind of flange these starter kits have on them? Since the HKS turbos are expensive, it might be nice to just get the starter kit and pick the turbo's of your choice from someone like Innovative or Presicion Turbo.

-amir
 
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Suprascene: Thanks a TON! That helped me out quite a bit. I don't even have a Supra right now but I'm just trying to plan ahead the route I'm going to take and make sure everything's going to work the way I want it to work, so I don't think I'll be getting one of the last few HKS kits. Damn. I hope they still get some more when I'm ready. Thanks again! Great help!
 

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Suprascene and I have been in a little thread on this before....

All the HKS GT series turbos are built from the Garrett Gt series line which are the ball bearing type.
You're actually looking for the ones with a T25 flange for the HKS twin kits(that's everything up to the 3037s that Paisley used on his 8 second Supra).
The good thing about getting the twin starter kit is you can then get any Garrett T25 variant BB or standard bearing (which is way cheaper) turbo you want to go on it from TEC or any other Garrett dealer. The advantages to buying the Garretts are you cut out the HKS $1000 dollar add on for "their specs".
Garrett is a world wide supplier of turbos with plenty readily available, so for the cost of one HKS BB GT series turbo you could get two Garrett BB GT series turbos. Viola! twin turbo kit to your liking.
Of course nothing is this easy but you get the idea.
 
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