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: I'll take some heat on this one I know, but I am not so sure I'd spend the $ on the HKS 2530's. I say this for a variety of reasons. I did see Bernie's post of his dyno charts the other day and it showed that at 17 psi they put down 415 rwhp and 402 rwtq - on a motor with heads and cams. Pretty similar numbers as the T25/T28's on a stock motor. I think that the built motor actually may decrease the power potential at 17psi. Changing the cam profiles and enlarging the air passages means that you lose low and mid range power to gain top end power. Essentially "17psi" is mid range power for these turbos, even though typically when you say "x-range" power, you refer to rpm. Anyways, there are other dynos where 457rwhp have been reached on GT2530's on stock motors... here's one: 
Still though, 457rwhp is just a bit more than 420rwhp. So, another thing you have to look at is at what point do the T25/T28's make that power? If the curves look similar, then if all you're going to do is run them on the street, the T25/T28's would be the ones to get. But, if the GT2530's curve is shifted to the left, there'd be more usable hp even though the peak hp is similar. : As for the TD05 kit, it is a bit expensive. I will say that the headers do a nice job of reducing lag. Comparing the HKS 2530's to the TD05's on similar motors, the TD05's catch the 2530's at 4,500 rpm. I agree... if money is no issue, the TD05's are very nice turbos. If money is somewhat of an issue, the GT2530's are good. If you're not eating so that you can have money to buy turbos, the T25/T28's would be the way to go. : The separation on the T25/T28's comes here: If you plan on running race fuel, then the 2530's will give you much more power as boost levels rise. My guess would be that at 23 psi, you could expect probably 50 more hp from the HKS 2530's. The difference being that the 2530's are larger and more efficient at the higher boost levels. I've never seen T25/T28's maxed out before. But, assuming that they max out at 550 crank hp (I'm just getting this from the "Sport550" name), then the GT2530's would have almost 75-100hp more on race gas at 24 psi. I pulled 531rwhp which is about 625-660 crank hp assuming a 15-20% drivetrain loss.
Bernie
Authorized sales rep for...
Datalogs every run... launches with boost in your 5-speed...
keeps turbos spooled between shifts... enables controlled power slides...
valet mode prevents abuse of your Z... unlike most factory systems, maximizes acceleration! For more information, pricing, or to purchase a system,
feel free to e-mail me: bhsiao@newssun.med.miami.edu
or visit the website
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21:02:45 03/25/01
you make a lot of good points... - 
