thatguywiththe7

jus wondering, but are either of these turbos really streetable? from wut it looks like KAi is to big but wut about the t88? or are they both? or neither? w/ abridge? has anyone tried to successfully run these with a bridge on the street?

milkman2k52

both have been used on street cars. The T88 is much bigger than the kai and there is really no point in using it's compressor is just about getting going at 25 psi and thats all you're going to see (and stretching it) in a street rotary. The kai has been used on many street cars and is more suitable (with a bridgeport).

Manolis_D

iTrader: (2)

The T88 Is just ridiculous for any 2-rotor engine, IMO. It wants to flow WAAAAAAAAAYYYYYYY too much air, at way too high a pressure to work with any 13B (and probably any 20B). the T51 is pushing it, but it sort of works. I wouldn't run the T51 on the street though. I think the biggest turbo I'd run on the street is a T66, and the GT35/40 looks to be just about the best all around turbo available.

I've got a TO4B 60-1 on my car, which is pretty decent. If i was to do it again I'd get a T61, which is very close in spec, but is able to handle higher boost pressure efficiently as well (the 60-1 tops out at around 15psi, the T61 will go to 30+).
My next turbo will be either a T61 or a GT35/40 I think...
-Manolis

T88NosRx7

iTrader: (1)

I like my T88, it gets the job done, I don't know anyone with the kai, so I really can't respond to that. I don't think it is ridiculous to have the T88. It is very streetable, and the kit is a good price considering what you get. I can hit 22 psi by 4.5k, which is ok. I know of other turbos that have worse lag than me.

TonyTurboII

Manolis, are either of those BB? I was pretty sure the GT35/40 was.

Ive been looking into which turbo id like to use after the car is up and running, and all of the great stories, I keep hearing about BB turbos spooling buy 2500 sounds great.

lane_change

iTrader: (20)

The GT3540 is BB as well as the Apex'i RX6. Neither the Greddy T88 nor the HKST51R Kai are BB. I am not sure about the T66 but I do not beleive it is BB. I went GT3540 since my freind has it and his car reaches 12psi by 2600rpm with the .81 A/R...I went 1.06 but I have been told numerous times that I should hit 15psi by 3200rpm or there abouts. It is the best street turbo in my opinion. I almost went T78, but I don't want to wait until 4500-5000rpms to hit 15psi. We'll see how it goes when I get it tuned. Badog is tuning it at the RX7 Revolution and I am hoping for some good numbers, I am going for a 17psi pull as well as a 22-24psi pull. Should be fun.

TonyTurboII

Sweet. Bring it home and give me a ride.

T88NosRx7

iTrader: (1)

lane change, I don't know anyone who has to wait untill 5k to hit 15psi. The worst I have seen is a friend of mine who has a stock motor w t78 and he hits 16 psi @ 4k. I don't know who told you that, but its wrong info.

lane_change

iTrader: (20)

I was going from some dyno sheets that I have seen for Supras, RX7's, and others...not an exact statement, I am sure, but I heard it lags almost as bad as the HKS T51 but not as bad as the T88...and I know Eric's T51 doesn't see 9psi until 4800 so I was kind of making a rough guess....sorry if I was innaccurate. Just going by what I have seen, noone around here has a T78 so I can't judge first hand.

93 R1

You can get ball bearing kai's and spl's if you have the money. The same goes for the t66, but in normal trim they all have regular bearings

Resource

I hit full boost by 4800 RPM's. At the time I only had my boost set at 9psi when I told you that


I used to have the Greddy T88 and I enjoy the HKS T51R KAI much more

Gorilla RE

iTrader: (1)

this is for the T51R KAI. Boost Pattern

RPM 1000 2000 3000 4000 5000 6000 7000 8000
Boost vacuum 0 psi 4 psi 9 psi 12 psi 18+ psi 18+ psi 18+ psi

T88Kid

I never felt the t88 was a problem on the street. I also did pretty nice numbers when I had the car on dyno.

Mario

T88Kid

Are you the same Tony Turbo that swore by the Halteh ecu's and openly flamed me for supporting Microtech? If you are it just seems so funny that you run Microtech now.

No harm done. Just seems so ironic. How do you like the MT?

Mario

EricM

Are you talking about Greddy T88 ? Or Thumper T88 ?

Greddy T88 is not that big. Compressor size is 70 mm, very big sure, but not mosnter big. T51RKai also has 70 mm wheel. T51RSPL has 76 mm wheel. Thumper T88 on the other hand, has 88 mm wheel. Now, that's monster big; you need a 20B to spool that.

Marcel Burkett

I Know that I am risking a good flamin' posting this but **** that here goes !.......
I dont know whats the big deal about lag and needing to see 15+ psi at 3500-4000 rpm , I know that it may sound and look good on your gaudes , but are you really getting so much power ?, isn't the idea to increase the VE and hence the flow of the engine ?, wouldn't a larger turbo be flowing more than a smaller one and producing the same or even more HP at lower boost at that RPM? , wouldn't the engine be "happier " making the power with less boost ? , yes I know the larger one is out of it efficiency range and you have to run 25-30 (or more) psi to get those turbos working ,but why ? , if you are already getting a lot of power before you get to the high efficiency point , what is the NEED to be most efficient ?. Some say that buying the larger unit is wasting money because it would never be utalized fully , so what ..., more power less boost why not ? , and you still have a unit that can support higher HP goals in the future with minimal mods to the turbo.
When I bought my car it was twin turboed and it worked great , the low end was good , 10psi @ 1500 rpm , but it always used to run out of breath up top , I recently had a T70 on my car and at 8 psi of boost I couldn't believe the difference in performance and all this was happening before 5000rpm , I am quite sure that I would catch and beat any twin turboed seven running higher boost , lag is minimal and power is maximum with the potential for more , I am now changing out that T70 and putting in a TA51/45 , ill see how 8psi on that will stack up to 15 on a smaller turbo.
If lag is such a concern , why not try to minimize it by trying to get the engine to go through the rev. ranges faster by getting it to "breathe better " , and rotate with less mass ( lighter flywheel) ? , I am quite sure one of those small " no lag " turbos wont help much in that department .

milkman2k52

I dont think you're going to get flamed here because most think as you do (hence the larger numbers of, well, larger turbos). The only real downside of having a large/laggy turbo is, in my opinion, lack of throttle response.

Lag is not what rpm you make what boost at, that is boost threshold. Lag is when you depress the accelerator and have to wait for the boost to come on. This is helped by having lightweight moving parts in the turbo (ala the kai w/ its aluminum compressor).

All in all though, bigger is most certainly better to a point. Unless you plan on autox alot

kabooski

The downside of BB or DBB turbo's are the rebuilding cost

I know Ari uses a Greddy T88 but remember there are quite a few diffrent T88's you can get

Marcel Burkett

Before this turbo 'craze' started , we were all happy with our normally aspirated rotarys , doing the various types of porting mods to improve response and performance , why not continue wit this and just add a turbo to the mix. I know that compression ratios were higher , but not by much . Most everyone running single is using a programable ECU , so why can the responsiveness be helped via more agressive ignition tuning when off boost ?.
The T70 i had on was producing a positive pressure while th engine was idling at 12-1500 rpms , surely the pressure / flow will increase as rpm's are increased , this surely is "mild" supercharging and would help the overall "off boost' performance , I noticed a very distinct increase in "off boost" performance with my port and turbo combo .
And some of us seem to forget that to truly enjoy what we have we need to "work da box" , if you dont want to down shift (which will spool that big boy in seconds) , maybe a 2 speed tranny is a better choice.

TonyTurboII

Thats me.

Remember, we're afraid of what we dont know.


Oh well. The car will be up and running soon. Ill let you know how im liking the MT then.

93 R1

Positive pressure at idle? I'm not following you. How is it making positive pressure at 1200-1500 RPM with no load on the engine? Not flaming you, I'm just curious.

Domestic513

They do make a bb Kai and a SPL. It will cost you around 800 more bucks though.

Marcel Burkett

Thee was a 1" hole drilled into my GREDDY intake elbow (long story ) and you could feel the pressurized air leaking out , it did not show on my boost gauge because of course it senses on the other side of the throttle body.

T88NosRx7

iTrader: (1)

damn t88kid, how'd you get those numbers? That was my goal, but 548 is the best i've done, whats your mods?

10sec rx7

That would have to be the most accurate statment i have read here all year!!