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Old 08-29-2003, 12:09 AM   #1
Soyo
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turbo difference

difference in these two exhausts, I mean is the second one worth an extra $300 or does it not really matter? would either be good for a KA24DE? is internal wastegate better than external? is a T3 flange a good size if I'm looking for 225-250hp, and yes I plan on rebuilding the engine first, and it will be a daily driver, hopefully put away for the winter though. thanks for away info

http://www.hksusa.com/products/?id=1670

http://www.hksusa.com/products/?id=1671


do you still need a BOV if you have an internal wastegate?
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Old 08-29-2003, 10:35 AM   #2
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the compressor wheel is bigger on the gt 3037. i think the a ka24det will take a while to spool the 3037, the 2835 i think spools up a little quicker.. if im correct the hks s-15 silvia uses the gt30 on its drift silvia..

now wastegates and bov are two different things.. the bov protect against compressor surge.. so it vent the gasses into the atmosphere.. a internal wastegate dumps out the excess exhaust gass when the throttle plate is closed i believe.. so you cannot have one or the other get both!



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Old 08-29-2003, 04:58 PM   #3
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sweet, that helps a ton! thanks
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1989 RX-7 TII --- Just got rebuilt and street ported
RB 3" dual exhaust, BNR stage 1 modified factory turbo, FCD, S-AFC II,
720cc secondaries, Aftermarket Turbo inlet duct w/K&N, Hawk HP+ pads
HKS Blow-Off Valve, Stainless brake and clutch lines
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Old 08-29-2003, 10:05 PM   #4
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Re: turbo difference

Quote:
Originally Posted by Soyo
difference in these two exhausts, I mean is the second one worth an extra $300 or does it not really matter?
you mean difference in those 2 turbo's? IMO, HKS turbo's are way overpriced. you can use a garrett turbo which is the same thing, but hundred's or even thousands less. look at this garrett GT30 and then look at the HKS 3037. compare the specs of the 2 turbo's. they look almost identical don't they? IMO, save yourself $1500 and get the garrett.

Quote:
Originally Posted by Soyo
would either be good for a KA24DE?
yep, they would both be pretty good for the KA. they aren't too small and they aren't so big that you will be waiting til redline to get power. they would both be good, but like i said before... get the garrett

Quote:
Originally Posted by Soyo
is internal wastegate better than external?
nope. internal wastegates can dump waste gases behind the turbine and cause high turbulence which will end up reducing the overall flow...not a good thing

Quote:
Originally Posted by Soyo
is a T3 flange a good size if I'm looking for 225-250hp
yeah. a t3 turbine wheel/housing will be perfect for your power range. no need to use a t4 wheel for the power levels you want.

Quote:
Originally Posted by Soyo
do you still need a BOV if you have an internal wastegate?
yeah, like turbo2nr said... they are 2 different things. he's right about the BOV's function and pretty close to the wastegates function. The wastegate is what limits the boost to your desired level. The pressure signal is sent from the wastegate to the boost controller. Say that the wastegate is set at 14 psi.... The wastegate will stay closed and let the exhaust gases spin the turbine up to 14 psi to create the desired boost. When the wastegate senses 14 psi, it will open which causes any more exhaust gases that come through the turbine to be let out into the atmosphere to keep the turbine from spinning any faster and creating more boost than the 14 psi.

have fun and good luck on your project
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