SouthSideSlider

ok my question is since im only putting a T08 on my 6 port shouold i go ahead get RX-8 E shaft and RA seals and not worry about getting FD rotors? i mean its a realy small turbo so its not alot of boost.im curious what you uys think. no im not going bigger turbo i already have the T08 out my old volvo and i want the fast spool of the T08.

RETed

WTF is a "T08"???


-Ted

SouthSideSlider

oh sorry from what i haven been told its the stock turbocharger off the B230FT from a 1989 Volvo 740 turbo intercooler.

VT_Rx7

lol

Aaron Cake

iTrader: (1)

Turbo is way too small for a 13B.

SouthSideSlider

i know its small but its free. and spools faster then a superchager LOL.

farberio

iTrader: (7)

free??

the turbo may be free...but you will spend a ton of money straping it on there for marginal gains (if that). Then when you realize its too small and crappy you will have to spend a whole lot more money re-buying everything in order to fit the correct size turbo.

HHTurboVert

+1 on the turbo being too small, keep your na rotors and use the money your were going to pay for the FD rotors for a stock FC turbo with a ported wastegate. I use S4 na rotors and push 10+ psi on an upgraded turbo. I've got just the turbo for you with the waste gate ported to over 30mm. If you're interested pm me.

somebody5788

LOL my buddy has one of those that turbo is like one of the smallest ive seen (except on VW TDI) I bet it would actually make you lose power... The stock rx-7 turbo is about 33% larger and spools up plenty quick.

SouthSideSlider

thanks you answered my question unlike everyone else. that fact your using N/A rotors with 10+ means my S5 with like 4-5 psi should be fine. i know it seems retarted to use a T08 but i dont hope for much power at all. its getting ITBs and turbo(like the Skyline GT-R) so i will have unbelievable throttle response and the unheard of low end rotary power.

im having to custom make alot of parts so i'll make it as easy as possible to swap to a bigger turbo when the time comes.

whereiscarmensandiego

theres more to just getting a turbo and putting it on the motor.. with that very small turbo it is gonna spool even when u are out of gear which is bad.theres no point in it even though its free its still a pos and shouldnt be used. u can get a s4 turbo for about 100$ maybey less and atleast have a chance at somting.

rotary engines take a turbo with a hotside that is twice as large as say your given honda motor because of the great differences

somebody5788

I truly believe that turbo will restrict air to the engine rather then increase. The problem is that 5psi from that turbo wont be equivilant in any way to 5 psi from a larger turbo. It has to do w/ the amount of air your compressing. You will have better performance and it will be MUCH cheaper to run a stock turbo.

SouthSideSlider

alright i'll look into other turbos i mean motor wise i know some about N/A and almost nothing about turbo. but i know a decent amount about drivetrain(im on my 3rd tranni after all.

Aaron Cake

iTrader: (1)

That turbo will make awesome torque and power...up to about 3500 RPM or so.

It is WAY, WAY too small. It's designed for a small displacement 4 cylinder and even on that engine probably runs out of grunt at 5K.

It will be an absolute and total waste of time to even consider putting this turbo on a 13B. When moving to a real turbo, none of the parts you would have fabricated (manifold, downpipe, turbo outlet pipe, oil and water lines) would be any use at all. It would be remarkable if this turbo made more power then the stock NA engine. I'm betting it would make less power then a stock S5 NA due to the massive exhaust buttplug that is the turbine. You'll probably need to downgrade your fuel system to make this work.

Don't run the S5 NA rotors under boost if you plan on staying reliable. In my opinion the compression is too high. Most people who do this don't have very long engine life. S4 NA rotors are fine. Currently I'm running 13 PSI on my GT40R using S4 NA rotors.

All those other people who "didn't" answer your question were giving you a much better answer then the one you wanted.

Texas_Ace

iTrader: (18)

Being very new to rotarys and the RX7 but knowing a lot about cars in general. Why is the S4 NA able to run with boost and the S5 NA not? Does the S5 have a high compression ratio or something?

I am going to pick up an S4 tomorrow and am trying to decide what i can/want to do with it.

/End Hijack

SouthSideSlider

ok well since i wont use the T08 would a GT35R be a good turbo for a rotary with FD or Turbo 2 rotors? i know its more expensive but its gonna be all or nothing on the turbo.

somebody5788

Yes the n/a has higher compression rotor's then the turbo's s5 also has higher then s4 its all in the FAQ if you look. Or on www.rotaryresurrection.com tech section.


If you still have the options of which rotor's go w/ s5 turbo rotor's. There higher compression but not enough to the point that you have to worry.

Andrizzanizz

iTrader: (1)

Are you trying to turbo a 6 port?

Aaron Cake

iTrader: (1)

The compression of the S5 NA is higher then the S4, which in the past has generally meant that it's not very reliable under boost.

Don't buy an NA with the intent of turbocharging it. Get a TII instead.

Texas_Ace

iTrader: (18)

I see. I am not getting the NA intending to Turbo it, i am thinking i might fix it, sell it for a profit, then use the $$$ to get a nice car. But if i did decide to keep it i was woundering what my options are.

TII's down here are $4k+, way out of my price range, and those hardly show up.

SouthSideSlider

ok well i have a line on a S5 turbo and exhast manifold so i guess i'll run that.


now anyone on here run ITBs on a turbo system? would a haltech work ECU wise? im wanting to do electric Aux accuators with a Aux bridge,streetport main, and agressive streetport on the exhaust. low comp rotors(t2 or FD) RX-8 eshaft, RX-8 stat gears,ITBs,FMIC. what porblems do you see with this setup?

HHTurboVert

Auxiliary bridge is one problem, I'm not an expert on it but I've heard it's a bad idea, especially if your so concerned about low end response. In addition, all that porting on the intake and the exhaust will not work well with the stock turbo waste gate, even if it is an S5 turbo. With a street port on the intake and exhaust ports you will get massive boost creep and blow your engine right away. ITB's on a turbo are not common at all, it will take a lot of time and money to make work and probably still won't work well. I don't think the hp gains(if any) would be worth the extra time, money and headaches.

I think the cheapest and easiest route would be for you to throw that S5 turbo(after porting the wastegate) on your na engine and then use a TII ecu, map sensor, and AFM. You would be able to run 5-7 psi. Better yet, get an rtek 2.1 and you could run more by just making some timing adjustments. Then when you pop your engine because you realize you can never get enough boost, you can buy a 13bt and drop it right in using your na harness and run even more boost.

When I first decided to go turbo on my vert, I did a lot of research on the subject on the best way to turbo an na. I found that buying a J-spec engine re-buliding, and then using a turbo ecu, afm and boost sensor was the best choice for 90% of people wanted to turbo their na's. This is not to say that there aren't other ways to do it, but the other ways will involve more time and money to complete and often don't yield the best results.

KhanArtisT

iTrader: (2)

Ordering a J spec and rebuilding it would be $2000+ with the additional work you'd need to do of taking the engine out so I disagree. If you want to shoot for big HP numbers then that would be the best route. I say stock TII turbo, RTEK (+wideband), fuel pump, 720cc sec.'s, manifold spacer/ported TII LIM, run oil and coolant supply and enjoy.

HHTurboVert

I think he made that sound deceivingly easy and inexpensive.
I also think he's overestimating how much work it is to swap a jspec in, it took me 1 whole day to remove the original engine and install the TII motor minus the wiring, and that was my first time ever doing a swap of any kind.

To source all the parts he listed, buy them, ship them, wait for them and install them would be much more work and more expensive than it looks at first glance. The N332 ecu ($100) Rtek 2.1 ($400), wideband($250), Turbo ($200), Manifold spacer($150),Fuel pump ($100), LIM($ 50), Custom AN lines for oil and coolant lines ($200), 550cc/min primary's ($100), 720 cc/min secondaries($150), TII AFM($50), TII MAP sensor($40). That puts him up over $1700 and thats just to turbo your high millage na engine that will require substantial tuning(more money or gobs more research) to run properly since you will be running a 6 port motor with 9.7:1 compression rotors under boost. After all this, you will still only be able to boost 10psi maybe with such high compression and will probably pop because he's already got 100k on the motor anyway.

If you get a j-spec 13bt for $1000, an AFM, MAP sensor, TII fuel pump and TII ecu for another $250, and throw it all in you'll have a less complex, more reliable tried and proven setup with the potential for higher boost and more power for less total time, money, effort and research.

I had to make this decision for myself 5 years ago, I spend the time to look at all the options, read through many other peoples opinions and experiences on this topic, price all the parts, consider the amount of time and work involved, the limitations of na conversion and the power and reliability goals I had in mind and decided that a jspec was the way to go. I encourage you to spend the time researching so you can make the best decision for yourself.

RETed

...lost?


-Ted