What Turbo Will i need?

[97240sxboost]

Ok i am building a KAT and i am using the 2.6L stoker kit from BC. BC stage3 cams, a full port and polish job on the head, port matching intake and exhaust, the motor will have a 90mm bore. i am using 800cc injectors and a JWT tuned ecu. i will use a AEM F/IC just in case i need to tune farther for my 650Whp goal. i will be running 8.5:1 comp. I will be using 11mm ARP head studs and Main studs as well. with a cometic head gasket. and a 40 mm Wastegate and greddy BOV(to atmosphere). also a Z32 MAF. Fidanza Flywheel, and exedy clutch.



My Question is that i am looking for a turbo......A Greddy turbo actually. can anybody tell me what a nice, quick spooling, turbo would be to meet my goals? Thanx in advance.

[cc4usmc]

So did you figure out yourself what parts you need to build that ka or did you have other people tell you what you need?

[97240sxboost]

I actually put this together myself. i have done low HP turbos on ka's like 250 and below. not much to them really. and they were bolt on kits. this is my first high hp build. i am ASE certified so i am confident in my ability to do this. but i am not very educated on choosing a turbo. i like greddy's products because of there quality. Do u happen to have any suggestions?

[cc4usmc]

Suggestions? No. I just don't understand why people go into builds like yours without knowing how to complete it. And when I say complete it, I'm not talking about not technically knowing how to put it all together, I'm talking about not having everything planned out to put together. Anyways, is there any particular reason why you want a Greddy turbo?

[97240sxboost]

Greddy has proven themselves time and time again. there turbos are quality products. O and personnal preference i guess. to each his own i reckon. and i know that a lot of ppl think the same way u do about not knowing what to use for a build. but i have done a lot of research on different turbos and i could prolly get one that will do the job just fine. but i have put A LOT of time and money into this car and i am just trying to make sure i get the right turbo to fit my needs. Im sorry if u dont approve

[sunnys14]

Greddy uses Mitsu turbos like how HKS uses Garrett.

Why do you want a Greddy turbo? They're kinda dooky.

Just go pick out a turbo that meets your power goals, it's not that hard...

Quick spooling and 650whp don't go together so you can throw that out the window.

[97240sxboost]

Thats why im asking. good input. i have used greddy turbos on two projects and they never did me wrong. but ppl have different opinions. and my projects never topped 15 psi. And by quick im not talkin instant. but i dont want one that takes 5 secs to spool up either. im trying to MINIMIZE NOT ELIMINATE lag.

[cc4usmc]

It's not that I don't approve of your build, I realize you're putting a lot of money and time into it, that's why if it was me I'd have everything figured out before I even started. I just like to be prepared. And, there is more to minimizing lag then the right turbo. Also, most people on this forum don't even get close to the power you're looking for. I'm assuming you're on ka-t.org?

[97240sxboost]

ur right there is more to eliminating lag than just the turbo, but it makes a big difference. But my build is never going to be different. im not changing my power goals or my parts. i know that my parts will do the job very well while still giving me dependable performance. I am mearly asking for opinions on a Dependable turbo. with all the money i have put into it i would like it to last a while.

[cc4usmc]

Well like I said, there are maybe a few members on this site that have the power you're looking to make. But good luck

[97240sxboost]

well i have been looking around and took sunnys advice. what do u guys think about the GT-K 650 from turbonetics? it claims 575-700 HP. this is right in my ball park right?

[umsports]

Borg Warner S366 would be ideal. I have an S362 on my KA-T and it's been a great turbo so far.

[hacknik]

Try KA-T.org.

More answers for your questions.

[S14DB]

LoL at Greddy Quality.

I would go Garrett GT4088R.

[97240sxboost]

Well i got onto a trbonetics forum and the guys there assured me that the GT-K series will spool up faster and reach my HP goals easier but i haven't yet made up my mind. thanks for all the input guys. it is greatly appreciated. Keep it comin. does anybody have any experience with the GT-K's? i would like another opinion.

[drifter_for_life06]

high power and quick spooling kind of counter-act each other. Cams will help with that, but you kind of have to give one to get the other. But as previously stated, fuck a GReddy turbo. Go over to kat.org and search they can probably help a lot better

But for the sake of it, I also vote for a Garrett turbo...like the 4088R...the borgwarner sounds like a damn good idea too. Ive been looking into one of their turbos for my Stroker SR20 build.

[97240sxboost]

Thank u drifter. does anybody know when the 4088R will come into boost? i have heard approx. 3800-4000. is this true?

[S14DB]

You sound like that is a bad thing?

[drifter_for_life06]

probably gonna be a little higher than that....but its not a bad thing. Seeing as how once you hit boost you can pull HARD for another 3-4k rpm depending

[NI_YON_Zenki]

T3/ to4e .70 a/r induction .63 exit turbine from garrett. Greddy is relative to their complete kits.

[nissan240]

exactly what s14db said "GARRETT," but if you got lots of money so go with hks lol! made by same company big price difference tho!

[ross.cottrill]

just fyi mybuddy has a gtk650 on his rb25 and its kinda lazy ,makes power tho.the crappy thing is i think that at the same boost i would pull him and i only have a full-race twin scroll 3071.my suggestion is if you have the dough,go with the twinscroll on a gt35r or 4088 and you will be money!BUT there are alot of things to consider as said before.cams compression ratio and supporting mods all will play a role in how easy or hard it will be to get there.

[97240sxboost]

This is all really good stuff. i think im going to go with the 4088 tho. i got to see one in action on a RB25 this weekend. Im very impressed with its spool up and linear power delivery.:goyou:

[umsports]

This is Chris, Posting Under Tyler's Username...Let me also vouch for the S366. I have run both on my 700+whp RB26 240SX, and the GT4088R wasn't that impressive. I'd be more inclined to recommend a GT4294R if you are deadset on Garrett.

The S366 that Tyler recommended will make 700-750whp all day, everyday, and be a reliable turbo.

The GT40R was pricey, and at 630whp was maxed out with the .95 A/R housing I had. If anything, go larger on the housing, and run a 3.5" exhaust!

I made 630whp @25 PSI.

By Comparison, my S372 makes 726 @24 PSI!

Also, get rid of the JWT ECU, and go with AEM and 1000cc injectors...I maxed the 1000's out at 650whp on E85...I currently run 1600's, which is overkill probably for the power you are shooting for.

If you have E85 fuel at the pump, tune for it, as you'll hit your 650whp goal on "pump gas."

[drifter_for_life06]

This is all really good stuff. i think im going to go with the 4088 tho. i got to see one in action on a RB25 this weekend. Im very impressed with its spool up and linear power delivery.:goyou:

the spool characteristics will be different on an RB than on an SR20

[HYPNOTIK]

i am using 800cc injectors and a JWT tuned ecu. i will use a AEM F/IC just in case i need to tune farther for my 650Whp goal. also a Z32 MAF. Fidanza Flywheel, and exedy clutch.


Do you have any idea what you are doing? I don't mean to flame but this thread is full of fail.

-800cc injectors will get you no where near 650whp.
-You want to run a mail order tune and a piggyback ecu for 650whp?
-A Z32 MAF will not support 650whp unless you put it into a 100mm pipe, you need to get a power fc or AEM with a MAP sensor
-I hope that exedy clutch is a twin or triple plate, I'm guessing not because you also have a fidanza flywheel listed.

650hp is no joke, you better get some quality parts to support it or you're wasting your time and money.

[waynehead05]

Do you have any idea what you are doing? I don't mean to flame but this thread is full of fail.

-800cc injectors will get you no where near 650whp.
-You want to run a mail order tune and a piggyback ecu for 650whp?
-A Z32 MAF will not support 650whp unless you put it into a 100mm pipe, you need to get a power fc or AEM with a MAP sensor
-I hope that exedy clutch is a twin or triple plate, I'm guessing not because you also have a fidanza flywheel listed.

650hp is no joke, you better get some quality parts to support it or you're wasting your time and money.


could not have said it better! I've ridden in a 720hp rb 240sx and I can tell you... it's not all fun.

[drifter_for_life06]

not all fun? are you kidding...its amazing...once you get over the initial scare factor

[irritatedmax]

Also, get rid of the JWT ECU, and go with AEM and 1000cc injectors...I maxed the 1000's out at 650whp on E85...I currently run 1600's, which is overkill probably for the power you are shooting for.


Do you have any idea what you are doing? I don't mean to flame but this thread is full of fail.

-800cc injectors will get you no where near 650whp.
-You want to run a mail order tune and a piggyback ecu for 650whp?
-A Z32 MAF will not support 650whp unless you put it into a 100mm pipe, you need to get a power fc or AEM with a MAP sensor
-I hope that exedy clutch is a twin or triple plate, I'm guessing not because you also have a fidanza flywheel listed.

650hp is no joke, you better get some quality parts to support it or you're wasting your time and money.


i am glad someone finally said something about this ^. seriously, drop the jwt ecu and z32 maf. get aem with map sensor or other standalone. you are spending a large chunk of change on that stroker kit. that sets the par for the build so build accordingly.

as far as figuring out your turbo sizing, take a look at garrett's tech section on turbobygarrett.com. read through the compressor map section then get to work doing some basic math. then look at compressor maps (COMPRESSOR MAPS (http://www.turbocharged.com/catalog/compmaps/fig1.html)) and see where your values corresponds. it is not as hard as it sounds. just takes time. obviously the site doesn't cover every turbo out there but its a start.

look at the featured rides on ka-t.org. there are a lot of high horsepower setups.

[Zerolift Autolab]

Look into the GT37R from Garrett.
We swapped out a 35R on a car here for this unit, and holy crap it has way more mid range and of course some more top end too.

[S14DB]

Look into the GT37R from Garrett.
We swapped out a 35R on a car here for this unit, and holy crap it has way more mid range and of course some more top end too.

I dunno if that would get him where he wants to be. Maybe a GT3788R. 35R and 37R seem to small.