sokudo

there is alot of road racing cars in japan running 51r's, 88's, 78's, 04's ect

Grizzly

But are they any good on tight windy roads (lots of on off the throttle)

Grizzly

Does anyone have a Dyno graph for a BB T51? Would i Half bridge help Responce or will it hinder it?

milkman2k52

HELP

But you still wont make tons of power until the higher rpms because of the modified timing of the ports.

AreaT51

How can you say "don't go with a T51, unless you love lag" when almost half of the people voted for the T78 on the pole? Dosn't the T78 have even shittier lag than the T51? It seems to me that the T51R-Kai would be kind of a compromise between the faster spooling T04S and high HP T78 especialy if you got the dual BB option.

AreaT51

OK...I feel like an *** I was under the assumption that the T78 was bigger than the T51. All these numbers are so ******* confusing. The local shop guy told me that, in his oppinion, the T78 is too big for the FD and that I should go with the T51R-Kai. After reading the REST of the posts here I'm assuming that it's the opposit. Someone please explain the diffs between the two. What spools faster and what makes more power between the Kai Dual BB and T78? I'm going to beat the shop guy over the head with a cast iron skillet for making me look stupid.

jspecracer7

Umm...August 22, 2002 was when glassman posted....Congrats on bringing up an old thread

AreaT51

I spent four hours reading all the threads I could find on this topic last night. Sorry if I missed one...*** hole! If you don't want to help me than just skip my posts and don't bother replying. I would expect the people in the RX-7 club and import scene in general to want to help people that are missguided...guess not.

jspecracer7

RETed

Wow, that was helpful...


-Ted

AreaT51

NO ****! Anyways...I walked into the shop with my frying pan and found out that the guy was actually saying a T-78 is too big for "that" car (pointing to a pearl white RX-7 in the shop bay) I guess that particular car wasn't built or tuned for a turbo of that size. He informed me that the Kai is bigger than the T-78 but it spools faster due to its aluminum fins and ball bearing design. Almost half the people that voted on the pole went for the T-78 and the Kai makes more power, spools faster, and supposedly sounds wicked. Who would take a T-78 over a T-51R Kai BB? I guess people who just want a turbo that costs less and are willing to sacrifice performance...but then...all the hardcore racers in here want the ultimate performer for high HP right? Hmmm. Why don't we put the Kai on a pole?

the_glass_man

iTrader: (2)

Maybe because this thread refers to a standard bearing T51. Even if you are talking about a BB version, it still won't spool for $hit, is almost impossible to get in the states, cost as much for the turbo as a whole T-78 kit and would be a nightmare to get rebuilt.
Please use the search button and do a little research.

RETed

What pole[sic]?
The subject like says "T51 Kai SPL", although the full name is "T51R Kai SPL" - you do know there's a significant difference between a plain jane "T51R Kai" and a "T51R Kai SPL", RIGHT???



-Ted

AreaT51

Forget it! It's no use posting it this forum. No one is of any help. It seems that there are no more subjects to talk about. I guess everything you ever wanted to know is in here...you just have to find it. And yes, I did use the search key. Do You have any idea how many threads come up if you type in T51R-Kai to search...and how many pages in some of those threads there are? I know there's a difference between the Kai and SPL but my question, reguardless of the thread title, was who would choose a T78 over a Kai BB that would want the ultimate performance. Answer? Glass Man seems to know it all. Accept that it's not that hard to get one and if you go to rotary extreme's site they have the spool/boost pattern of their RX-7 with the Kai installed that shows you it starts to boost at around 2500rpm and hits 1 bar right below 5500rpm. Besides...what happened to everyone saying, "I'm so sick and tired of hearing about lag" and "All you have to do is down shift". You guys need to make up your minds. You clown on the people who are concerned about lag then use lag as an excuse for people not wanting a certain turbo? What the **** is wrong here? I'm out. I can get more info out of the local shop than I can here. PEACE!!!

the_glass_man

iTrader: (2)

Maybe because we are tired of wasting time responding to threads like this, because people don't take enough time to research things themselves.
So there is a lot of threads to search through, who gives a $hit? If you want to find out about something chances are the question has already been answered a billion times.
But, you're right you obviously know more then me and everyone else on the forum and will have your ultimate power off the shelf turbo kit.
Good luck with it.


BTW: I never said that the standard bearing turbo was hard to get ahold of, it's the authentic HKS BB T51, that's hard to find, but again you know it all and I'm sure you already knew that.

AreaT51

Glass Man->

RETed

My my, aren't we angry...



-Ted

BoostedRex

Can't we please act like adults and just try to help the guy instead of starting a flame war?? AreaT51, it seems that the reason people choose the T78 is because it makes really good numbers at 14-15 psi. I really don't know all that much about the T51, but it seems to make good numbers at that boost but it can also put down incredible power after you up the boost. The T78 uses older technology. It's still a great turbo though. It's just that the aluminum wheels in the 51 allow it to spool faster. And Chuck has a point about the lag. If you're drag racing you're going to launch at 4000+rpm so lag really doesn't matter. Best of luck to you.

Zach

AreaT51

Thank you Zach for taking the time to give me a little info. I appreciate that. As for boost levels...you hit it right on the nose. I'm looking for the quickest spooling turbo that will put down good numbers at 15 psi. It looks like the APEXi RX-6 is an extremely responsive turbo but to put down big numbers (450+) you'd have to boost the hell out of it. Thanks again man.

allrotor93

iTrader: (126)

i would say go for the t04s. it spools just as quick as most everything else, makes good power, and is cheap to buy and rebuild.

AreaT51

Thanks man, I appreciate it. How much HP do you think the T04S is good for at 15psi with a properly tuned properly street ported motor?

Brian7

On a ported 13b-rew you should be making 400whp +. Here are a few dyno graphs with numerous setups.

racer1

I will post in this trhread all the info you need with a dyno graph in a few weeks when we install the T51R SPL BB on my side ported engine. For now all i can say is that this turbo is HUGE! I've been in a FD with the T51R KAI BB and it spools very fast and very smooth for its size. You have boost from 2500 rpm but it kicks in with 1bar at 4500. On a side ported engine again. There is no such thing as "lag" on a rotary engine. Since you have boost from 2.5-3k rpm you cannot call it lag. You just have less power on lower rpm's with a big turbo, but you cannot call it lag.

turbocuda

The kai is basically a gt42-56trim, the spl is the 53 trim.....both use the same turbine but different compressors....These are both great wheels with new faster spooling technology and are used in many "supra turbos..sound performance line..." hell the h/o versions of the sp series use the larger gt42 turbine wheel....

Don't forget you've got a rotary, with tremendous amounts of exhaust energy..put all that loud rotary noise to use to spin a big enough turbo!