Is this Turbo a HKS's own (do they make it?) or is it a (for example) Garrett?

I'm Going to be Using a GT3540 on my car when it finaly hits the road but is the T51 much more agressive than that?

 

Can you Buy a T51 Turbo on its own?

 

All HKS turbos are made by Garrett, you don't want to go with T51, unless you love lag and want really high horsepower numbers that start around 7K rpm.

 

don't exagerate!! my t51 has fulll boost by 5k

 

but the SPL is to big just go with the regular kai

 

I'm sure you engine is ported in someway and that you may have the BB option which does help with spool time.

 

All HKS are Garrett turbos. HKS liscenses whatever they sell so that you cannot buy the exact same thing from Garrett. HKS turbo's are made for higher Pressure ratings vs. the Garrett's on the small turbos. There is less of a difference on the larger turbos. The t51r spl is too big for a 13b.

 

i have full boost on my bb kai by 4k and it pulls hard until i get out of it

 

When you talk about full boost, please specify how much boost is full boost and at which gear.

I have a good boost vs rpm chart on my website. Go to http://www.rotaryextreme.com/hks.html and you will see it.

A good way to check the max boost the rpm can support is by listening to your wastegate. On my car, I have the wastegate open to the atm. Below 4500-5000 rpm, the wastegate is fully closed (I don't hear the crazy wastegate dumping sound.) and at that rpm range, the boost is about 0.8 kg/cm2. Once above 5k, there is enough exhaust flow to support 1.2+ kg/cm2.

T51R Kai actually spools up as fast as a T78 despites it's larger size. The whole turbo is lighter than a T78 so I think the material it uses is lighter than the coventional turbo and allows it to spool up faster. Less weight means less rotational inertia but since the turbine wheel is at larger diamter, everything just cancels out.

In theory, the T51R SPL should spool as fast as the T51R Kai. On the T51R SPL, the turbine wheel is the same as on the T51R Kai but the compressor wheel is a little larger. Since the compressor wheel is made of aluminum, it does not really contribute a lot to the rotational inertia so it should spool up as fast as the T51R Kai. This is the same concept when you fit a larger compressor wheel to the stock twins to increase the air flow without increasing the lag.

Chuck Huang

 

I just bought a GT3540 for my friend. That thing is so tiny compared to my T51R kai turbo. The T78 is tiny right next to my T51R kai too.

Chuck Huang

 

Hey Soul,
A certain company here in japan(not us)has played with a spl on a 13b and the response was great. It spools just as fast as a kai.

 

i hate you! don't be telling me that ****! thats one of those things you wait a few months after i drove with the kai in then you say , by the way a spl would be faster!! damn you! anyone want ot buy a kai?

 

Yep. I would love one, How much are the BB Kai? (Roughly). Running on a half Bridge will it be alot more Laggy than a Gt3540?

 

i want to tell you this first don't take offense to this next comment.
i am sick and tired of people complaing or asking about turbo lag, honestly what do you people except a turbine that makes 800 hp to spool by 3k rpms? give me a break. of course the kai is going to take longer to spool,its a bigger turbine. kai won't get full boost till upwards of 5k rpms, this has been mentioned 1000's of times before but yet everyday i come in here and see people asking the same questions about lag and spool time
ok honestly people don't try to buy the biggest and baddest turbines t51's t-88's y2k's and such and expect them to be like your stock sequential twins spool time. drive a single turbo conversion then i bet you won't even ask about lag anymore be cause no one really cares once you have that much power. example
me and sokudo
he had his turbonetics t67-1s or some sort of turbine it was ballbearing and i was running my to4r. on the streets from signal to signal he would smoke the **** out of me but come fri day nite i would blow by him like he was standing still. i loved my to4r but i also liked the kick it had sokudos was a smooth transition you would barely be able to tell he went form no boost to boost it was that smooth just pulled hard as **** constantly, mine on the other hand you will be hauling *** and it is like someone strapped a rocket on the back of it when the boost came on at 4500 or so. i hope everyone understands what i am trying to say i hope no one takes this the wrong way and starts another flame war.
my .02cents

 

now play nice, the turbos were close in size but you 04 was clipped which affected the response.....but who has the ***** now....lol



but have to agree with you i to am tired of hearing the word "lag" if i didnt have any response i wouldnt be able to smoke the tires through 4th gear, last time i checked when i left the line at the strip it was at about 5000 rpm and had hella response. i have no problem passing those slow *** fc's, gtr's, supra,'s lancer's, wrx's ect ect that are always in the way..lol

horse power rules......lag is in your head

 

I second to that. Lag only happens when you start from stop. But if you are racing, you are going to drop the clutch at 4000-5000 rpm anyways so the lag is out of the window. On the freeway, just downshift. If you don't downshift, why do you need 5 gears? You should be riding a single speed scooter. Anyone want to buy my T51R kai turbo so I can try the T51R BB?

Chuck Huang

 

How much HP are you getting from the T51R kai BB? Smoking tires through 4th gear sounds a lot of fun.

Chuck Huang

 

600 hp with 1.4 boost straight waste gate. didnt have time to hook up my boost controller. and intercooler is to small because air temp rised throught the dyno pull. going to change out intercooler, hook up boost controller, crank boost to 1.6 and see what happens....

 

then you should see at least 600.1 with those changes!

 

Soul sorry to keep going on but i am at a cross road Gt3540 or BB Kia? i live in the Uk so which ever i end up with is going to be a pain in the **** shipping,so i want to make sure i have the right one for the job. Personly i am swaying towards keeping the Gt but there is a little voice saying mmmmmmBig Turbo = Big Bhp but i know this will kill my Country lane Responce (on off the throtle) and turn it into a Drag car but whats the fun in that.

 

how much hp you want? howm uch you willing ot spend the bb kai will set you back anywhere from 2200-2800 just for the bb kai alone depending on where you get it. if your pockets are deep and you don't care about th relibility issues with the bb kai go for it. the bb kai i am not sure if it is fixed or not but was not recommended for daily driving,bearings were too small and would not hold up long over everyday abuse.

 

The more the better i'm looking to get about 500-550 Rwhp but i think that may be a little optimistic as i live in the Uk and i built the car. So we'll see

The problem i have is to get big Hp i need to use a Big turbo which in turn reduces responce, if i was going to just use it on the strip it would be an easy choice but i love road racing and the odd track day so i might go Gt 3540 with Nitrous for the strip.

 

how much are you selling chuck (rotary extreme)?

 

I will sell it for $1750 shipped. Turbo only. 10k miles on it.

Chuck Huang

 

I think all the big HP guys and all the guys with experience should start a sticky thread for all us wanna bees. Listing variuos turbos, their peak boost/HP and what rpm range they work best at also what they would be best suited for street/strip drag racing or street/track roadracing. I'd be intrested cause I plan on going turbo in a few and want the most HP for roadracing.