Fastest spool and 300hp

[LEMHEAD16]

I am looking for the turbo that will provid ethe fastest spool and be efficient at 300 hp. I am running a super 60 right now but I think it pushes alot of heat at that HP.

I am thinking some GT series but, I don't really know how to read compressor maps.

[GlacierFreeze]

GT28R is probably your best bet. IIRC it maxes out a bit over 300whp (haven't seen a chart in a while). Great for low lag setup.

[myRed240]

Not sure of exact numbers, but the GT32 that AMS sells should work for you. You should look into it.

[lrb_2000]

I have a friend that has a gt28 from a GTI-R and a GT28RS for sale.. he lives in lewiston, id.. so pretty close I think.

[hannibal]

I'd say some kinda GT28, maybe 2876

[SR20Essex]

Are you talking 300whp or 300bhp? I have a GT28R (AKA S15 SR20DET turbo) pushing 260whp which translates into about 300bhp (crank hp). Thats at ~13psi boost. I wouldn't push it any more than that, but I know people who do it. Even at that level I've turned it bright orange, racing up the mountain near where I live.

It is very low lag and makes a very broad torque curve.

[WDRacing]

Efficiency is the key here fella's. I wouldn't be putting a T25 exhaust housing on a KA ever. Unless it was a used turbo and I was only going to push 4 psi or so. The smaller the exhaust housing and the smaller the AR of said housing the more back pressure you're going to have. The 2.4 liter KA is a great little stroker for a 4 banger. I find they enjoy larger turbo's, I've run several on mine playing with various combinations.

Hoestly, save your money and don't buy a GT series, unless of course you're getting a smoking deal. A T3/TO4E with a smaller .48 AR exhaust housing will spool very fast and be good for more then 300WHP. Which is really what you want to look for. Personally I used the .63 AR and it spooled fast enough for me. My rule of thumb is this, if it spools really fast, it's to small. Most books on turbo's say the same thing. The slower the turbo spins to make said amount of boost the more efficiently it will make the power.

Just my opinion, but I've seen lots of various combo's on the KAT...the T25 flange is just to small in my book. But I'm a bigger is better fan.

WD

[LEMHEAD16]

Thanks for the input WD. IF I was going for huge power I would go with the larger t3/t04e .57 or .63.I plan on using this car mostly for autocross so instant power is more important to me than max power. I would still like to see 300 at the wheels though.

Do you know where the .48 housing would spool? or where I can get one?

[240 GTR]

i have been wondering this also, but i am looking to get around 350whp. would the t3/t04e .48 be able to get 350 at the wheels?

[WDRacing]

I'd say the .48 AR will be able to push over 300. Fiz had his .63 at 420whp at a mere 20 psi.

All of the road racing I've seen, the motors are never below 3500rpm, which is full boost with the .63 actually I was at full boost before that, but by 3500 definitly. With autocross the smaller turbo will be glowing red hot, so again, bigger will be better and if you're experiencing lag...then you simply suck at driving...lol.

WD

[jmwenick]

If I were you, I'd get a .50 Trim .63/.43 Its gonna spool really quick and push well over 300. I guess these are awesome pump gas turbo's. I ran a .57 trim on my KA and loved it. It hit full boost at about 3600 RPM. Next turbo I get is def gonna be the .50 trim. Full boost at about 3100-3200. Thats my opinion anyway.

[Carkeeper]

The "Disco Potato Turbo". GT28RS from Garrett. I have an SR20 in a 200SX making 315 whp on pump gas with this turbo.[Legal JWT Turbo Kit] Spools great with 2.0L so you should be set unless you have less than a 1.8L motor.

[Jookmasta]

i thought with those gt28's that he would need a t25 flange..................he has a t3 flange currently. i suggest the ams gt32 if ur not happy with ur super 60. what boost level are u at right now?

[GlacierFreeze]

i thought with those gt28's that he would need a t25 flange..................he has a t3 flange currently. i suggest the ams gt32 if ur not happy with ur super 60. what boost level are u at right now?

Oh yeah t3 flange... I'd also suggest the gt32 or even a gt30r (don't think they have non "r" versions, could be wrong though).

Here's a link to a dyno of a KA on a GT32. Power comes on pretty early and doesn't fall off too bad with 240/248 cams in it. Crower v2s would be really nice I bet. I think that turbo is good for around the 20psi area. Dyno was at 11-13psi.

http://www.ka-t.org/forums/viewtopic.php?t=6117

[hannibal]

I think the compressor of a GT28/GT30 is more efficient (than a T3 or T04E) but the turbine side could be too small for a KA. Would a GT30R (with its T3 turbine) be a good option? Ivan or Chris did say AMS can build a GT32 with BB (its not standard). But something Ive never truly understand was matching comp and turbine sizes.

I'm no autoX expert, but arent there tighter courses where you could drop below 3000rpm in 1st gear?

[WDRacing]

I've only driven a very few times myself...like 3...lol. I did it in my Miata back in the day, NA so it was a whole different animal. I guess there could be some turns where you dip close to 3000, but 3000 is really low in first. I do know guys prefer to stay in second, maybe thats why they dip close to the no boost threshold. In which case a smaaler turbo will be slightly more competitive. WHen I was in jail, I actually read Maximum Boost for the first time. Corky beel compares two cars from the factory, one uses a very small turbo and a sidemount IC because it has to or the motor will detonatevery badly do to the high heat levels of forced air. I believe it was a Nissan actually he used as an example of a turbo being to small. The other company was Porsche. Thye had no room for a IC at all, so they used what Corky refers to as a properly sized turbo, which was significantly larger then the Nissan unit, but could be run with no IC at all. The public didn't like the wait for boost...cause we are generally greedy and ignorant at the same time. But Porsche builds cars that are engineered to compete in races of all classes, aside from drag. When was the last time you didn't see Porsche in the top 5 of whatever autocross/road race event?

Alot of high HP cars will be racing together, I guarantee they don't all have boost coming out of the tight twisties, but it's a split second away. Those who run a large amount of boost pull away from the pack at the first sign of a fairly straight or long sweeping turn. Those who run low boost and a small turbo...well, they don't.

Sorry for the long reply. I'd say any turbo with a T3 exhaust flange will be better for racing then the T25.

Think about the cost comparison as well. What are your goals as far as money is concerned?

WD

[240sxRAOR]

There was a dude on ebay who was selling a nissan supercharger set up for the KA24de and if I had the money I would have bought it then since it was a promotional sale. If its instant boost I'd go with a supercharger since you only need 300hp at the wheels. But since you probably already set up your car for turbo that might be a pain. Honestly I don't know alot about turbo's but I know with superchargers they are awsome for instant boost and if you get a the clutch type you can drive without it on and save gas.

[WDRacing]

Not really, the clutch engages when the motor goes under a load, just like a turbo. There are 3 basic types of superchargers as well. The most common and easiest to install has the most lag. This is the centrifigul type. It looks like a turbo but is belt driven and boost only increases as rpm increases. The other two types are basically the same, they are roots type. They are considered positive displacement blowers. They don't compress air, they just force more into the motor, think old chevy with a hole through the hood. Kenne Bell has designed a really good roots type without ALOT of parasitic loss, but there will always be some. I've yet to see a 240 with a decent supercharger setup.

Simply put, turbo's ARE more efficient and will make more power. The only reason top fuel dragsters use roots blowers is because they have to, its in the rules.

WD

[WDRacing]

I was just looking at the AMS GT32...I'd put that as my new favorite turbo for the money.

[LEMHEAD16]

I saw that SC set-up. It looked really nice for a roots type setup on the KA. I think that SC will limit the amount of boost you could run though to 8-10 psi. I don't think that boost level would reach my hp goals.

The AMS GT32 has been on my wish list for a long time.

[WDRacing]

You don't have a link to theis SC 240 do ya??? It has my interest perked.

[KATwo40]

Keep in mind, WD, the AMS GT32 (or any GT32 for that matter) is cheaper than a new T3/T04E, and uses much newer technology (i.e. lighter, smaller wheels, which can displace a large amount of air and provide quick spooling, even in a journal bearing unit).

I'd say if your peak goal is 300whp, go for the GT32. It'll come in a little sooner than the T3/T04E .50 trim (which I currently run) and stretch out all the way to redline. I love the T3/T04E and wouldn't trade mine for a GT32 simply because I'm shooting for 400+whp, but that's a horse of a different color, so to speak.

As WD already pointed out, don't even bother with the T2 series turbos on a KA if you're trying for 300whp. It's a waste of money and time and you'll be disappointed when the power starts falling off around 6,000rpm pretty hard.

[WDRacing]

I'm a bigger is better guy, I have a T3/TO4E in 50 trim as well, but am trading it up to a TO4R with a huge .81 AR hotside...ball bearing center though. Its a DIY job I put together with spare parts and a few new ones I scored deals on. You think 3000 is lag...lol, I'll be hitting 5000. It should make a smallish amount of boost after 3000 though, say 8-9, it just won't flash spool till about 5000. I think of it as my way of getting better gas mileage around town

[GlacierFreeze]

I was just looking at the AMS GT32...I'd put that as my new favorite turbo for the money.

Yeah, I totally agree. It seems really balanced for the KA that won't see crazy high power.

[partymonster 975]

GT32 ftw no doubt.

[s14det]

I have ran my GT32 at 18psi and daym it scares me. I can get 15psi by about 3200rpm and 18psi is about 3500 or so. I also have Crower V2 cams also, but man GT32 is a good all a round turbo. AMS says it is good for 400-450hp. It makes for a great turbo pretty much everywhere, unless you are going all out drag I guess.

[GlacierFreeze]

I have ran my GT32 at 18psi and daym it scares me. I can get 15psi by about 3200rpm and 18psi is about 3500 or so. I also have Crower V2 cams also, but man GT32 is a good all a round turbo. AMS says it is good for 400-450hp. It makes for a great turbo pretty much everywhere, unless you are going all out drag I guess.

Nice.

BTW, do either of the dyno charts in your cardomain section include the Crower V2s or are they with stock cams??

[LEMHEAD16]

Is the GT32 a T3 flange?

[SeanC]

yes.

[s14det]

Nice.

BTW, do either of the dyno charts in your cardomain section include the Crower V2s or are they with stock cams??

The dyno is from a stock internal engine plus S13 cams. I have not dyned it yet with the new engine and cams. I can say it pulls some much harder now at 10psi then it did at 12-13 psi on the stock engine. With the GT32 and the V2 cams it makes for a car the is very fun to drive. Now just need to find away to get the power to the ground.