selecting a turbo 500WHP

[chrislockhart]

i made the huge mistake of buying a cxracing bolt on t61 turbo and it seized up by grinding it self into the compressor housing after 800 miles of 4-10 psi and only seeing 15psi max on the night it died on a BRAND new engine of the same mileage.
(i got it because i needed a turbo that could pass smog and look stock and i figured id get this big ass turbo for the same price as buying a stock one haha my bad)

im looking for a very GOOD, very quick spooling ball bearing turbo that will max out at 450-500whp on 91 pump gas. or maybe 450 on pump and 550 on race gas? and im planning on getting an hks t4 cast manifold depending on what people think of it.

so buying everything i need to go t4 and staying under the price of buying a bolt on Boss Sr. turbo means id have about $1200 to buy a turbo.

any input on this would be great, thanks

 

[CajunKenny]

www.notrice.com has a few bolt on turbos...

450 on pump isn't easy to do.

 

[enjoi.this]

could always join the holset mafia with an hx40

local guy here made 478 whp on a 1jz with one of those turbos at 25 psi

 

[hvyman]

precision 6262. The non bb one is only 900 and has a billet compressor wheel.

 

[Nick M]

I would ensure the engine is built properly, and not just new or rebuilt. It will make the power goal much easier to achieve.

 

[chrislockhart]

precision 6262. The non bb one is only 900 and has a billet compressor wheel.

thanks ill call them up and look into that for sure. but the one your talking about is a 62mm wheel, and i thought that i needed more like a 67mm wheel to get 500hp on 91 pump gas. but the turbo with the 67mm wheel (precision 6765) is rated at 900hp(i know that is not on pump gas) but is that actually the one i should be looking into?

could always join the holset mafia with an hx40
local guy here made 478 whp on a 1jz with one of those turbos at 25 psi

thats the first thing i thought of... but i think i want something more perfectly matched to what i need and i would like the billet wheel and ball bearings for the fastest spool i can get since ill be running a huge turbo to make up for 91 pump gas

I would ensure the engine is built properly, and not just new or rebuilt. It will make the power goal much easier to achieve.

iv completely rebuilt the engine from top to bottom all bored, decked, ground, and definitely done right with the only limit being the stock NPR pistons i put in. looking back now i wish i would have gone with forged but all well, ill save that for next time... which will probably be soon...


sorry for my turbo ignorance. but i did just order the book (Maximum Boost) that everyone seems to recommend. so ill be learned yet

 

[hvyman]

What are you going to tune with? Ems?

 

[Moy]

could always join the holset mafia with an hx40

local guy here made 478 whp on a 1jz with one of those turbos at 25 psi

with the HX40 you'd need to get a smaller hotside. They come 17cm^2 on most I've seen, which is around 1.29A/R (IIRC). It would take forever to spool haha. One member on here has one and hits ~12psi at about 4000 with the stock exhaust housing.

 

[chrislockhart]

What are you going to tune with? Ems?

im not sure yet. for now i just have the lexus afm, walbro, afpr, and wideband. i want to go stand alone but i need to look at all the options. the only one iv really seen is the AEM. any others out there i should know about let me know

 

[2543arvin]

I have the Precision 6262 and mine just dynoed 440 whp at 20 psi on a dyno dynamics. If you curious about the numbers, it compares to roughly 506 whp on a dynojet. This was all tuned with the Haltech PS2000. I love this setup!!

 

[92nsx]

http://www.supramania.com/forums/showthread.php?66742-***SM-Member-Horsepower-List***

This will tell you

 

[chrislockhart]

thanks 92nsx... so i think iv pretty much narrowed it down to the pte6262 or the HTA3586

 

[Nick M]

iv completely rebuilt the engine from top to bottom all bored, decked, ground, and definitely done right with the only limit being the stock NPR pistons i put in. looking back now i wish i would have gone with forged but all well, ill save that for next time... which will probably be soon...

That is good, but I was refering to head work. Specificaly bowl work and maybe oversized valves. You are past that point though. Don't sweat it, I haven't done it either.

 

[chrislockhart]

well iv come to a decision. comp turbo CT4-6265 billet ball bearing .84a/r T4 divided housing with quick spool valve. i think im gonna be happy.
now im not sure what manifold or waste gate to get...

 

[hvyman]

Seems like a precision copy. Personally i would go with the presicion. Iirc they were the first with the aftermarket billet wheels. Holsets also have billet wheel.

Good lcuk tho. Comp turbos seem to have a good rep.

 

[Blackdawg]

I think you'll want a standalone for 500+ rwhp and NRP pistons. If you dont get your tune right your gonna F@*& up those pistons. I wish you had gone forged man! haha oh well, not that 500 can't be done on those pistons but they aren't going to be forgiving with your tune.

Id check out Driftmotions 67mm turbo too, i got it and am planning on a good 400ish rwhp. They also came out with a huge 72mm turbo if ya wanna go crazy! haha

 

[Beefy_Heafy]

I'm also looking to make 500hp on pump gas. I've got a gt3582r with the .82 t3 rear housing ATM but am making a bunch of changes and want to get a quick spool valve and also i found a t3 divided rear housing with .82ar very cool. My aim is mainly for insane area under curve but hopefully it will get close to 500rwhp.

 

[chrislockhart]

ya i do want to go stand alone, im pretty sure im going to go with the aem. for now im just shooting for like 15-17 psi not quite 500whp prolly more like 400 and ya i am worried about my pistons. i really wish i would have gone forged (i have a bad tendency to blow shit up) and i mean everything lol not just engines.

gt3582r- nice...thats almost the same as mine. i would definitely get a QSV. how soon are you putting yours together? when do you expect to hit full boost? let me know what happens when it gets going

 

[Beefy_Heafy]

bummer about the pistons but if your careful you should be fine. just remember that since you now have a mls head gasket you have made your pistons into the "fuseable link" in the chain and you therefore need to be careful with tuning.
Read my build thread. it will give you some good info on what you can expect. don't be too worried about my output though as the engine is running pretty dud on 1 pot due to busted oil ring and i dont really have the supporting mods that i need. should come apart and go back together in next few months with standalone ecu ffim better turbo fuel and spark etc.
I don't see how the new combo wouldn't be able to reach the 500whp barrier considering what i haven't done and the power im currently making. i think the trick is to be comprehensive with supporting and efficiency increasing mods in order to let everything work to its full potential. and by doing that you will also get wicked power under the curve.
currently boost goes positive at 1200rpm and makes 15psi at 3800.
i make 350rwhp at around 6000rpm on 13psi (high rpm boost drop off) and that's with factory ecu and fuel (turbo a is a bit different with map sensor from factory etc)

with the quickspool valve i would like to make full boost a lot sooner. i really want a super quick spooling area under the curve type car.

but like i said read my build thread as im on the same path as you in terms of power goals and it should help you out.

with turbo selection. im not sure if the .82 ar ratio i want to go with will run out of puff but its rated to 600hp so i reckon as long as the engine ticks all the other mod boxes it should scrape it in.
is this what you are thinking also?

 

[chrislockhart]

ya i totally know my pistons are the weak link... if i would have just spent the $800 i could have had this thing good for like 700-800whp kicking my self kinda... but whatever. its not really a big deal to get it bored and new pistons later. but the next time i take this thing down that far its going to get a lot more than just pistons... id get new 6m crank(using 7m crank now), rods, pistons, bigger valves, cams, have the whole thing balanced and ported, and whatever else i can think of.

well i talked to a guy at comp turbo and first he recommended the 60mm billet with .84a/r divided housing for using the QSV he said he would recommend a smaller a/r if i wasn't using a QSV. then i decided to go a little bigger with 62/65 to have a little more room for whatever... more power later, better top end, easier to get my 500 pump gas goal...
billets flow more and this turbo it is rated for 750hp
i think ill have all the power out of this turbo that my pistons can handle

---------- Post added at 12:32 AM ---------- Previous post was at 12:31 AM ----------

and then some lol