fc1jz

Guys,
I just thought I would let you know that I decided to chance the "T70" on ebay.

The pics in the auction clearly show something more similar to a t61. How could this be a t70 I asked myself??? I don't know what got into me that night, but I thought I would chance it. I contacted him directly and he sold it to me for $400 shipped to my door.

Well to my surprise, I open up the turbo box and there lies this monster turbocharger. So immediately I get to measuring the compressor..major 3.9"....minor 2.72" ....damn thats 69.1mm....I REALLY GOT A T70 FOR $400!!!

Now here is the dilio....It came with a .68 a/r undivided turbine. I know this is a large turbo, and I want some low rpm spool. But I also know the rx7 is an exhaust pulsing beast. I am looking for a 430-450whp. Will the .68 cause my power band to die off???

widebody2

You have me very confused...what do you mean it has a .68 exhaust AR and that it is big? .68 is very very small for an rx7 exhaust side AR. Too small actually. I use a 1.08. Now if that is the cold side which would make more sense then its an OK size but still not huge. I believe he ended up sending you his "GT45" turbo and not the super T70 because the super T70 has .7 cold side, .84 hotside with a 65 mm compressor wheel. If I remember correctly his "GT45" used a .68 cold side AR with something like a 1.0 or 1.05 hotside AR which is big but in my opinion the perfect size for an FD. I don't know much about FCs and what type of exhaust amounts the put out so your on your own with that one. I thought i was in the third gen section.

kabooski

no no the ar in the back is .68
which is fine for Slonda but not good for a Rex

You will need at least a .81 turbine housing with a T4 foot print and not the T3 it has

widebody2

This is a good way to put it: Is the bolt pattern on the flange almost a perfect square or is it a definite rectangle? His "GT45" uses a t4 and the pattern would be the perfect square. His "super T70" uses a T3 and the pattern would be an obvious rectangle, with the distance between 2 of the bolts being about twice the distance between the other 2.
I actually think the super T70 would be fine for an FC even though it uses a T3 but if you are looking for that 430-450 HP you will need the "GT45" and thats the one I think you received. I also don't want to hear from anybody that the T3 is too small for an Rx7 because that myth has already been disproven by the real GT35/40.

fc1jz

I am somewhat familiar with turbochargers and Yes it is a t4 footprint not a t3. It seems to me from the specs of the turbocharger itself, that it is definitely a t70, not sure the specs of the gt45 though.
I mean, this thing is pretty darn big. The inside of the opening on the inducer is nearly 2.75" and the exducer is 2.5" o.d. 2.1"id according to my measurements.
I thought the .68 a/r on the turbine may be too small to max out the turbo, but not to get 450whp. I just don't want my power to choke off at 6k because the turbine housing is too small.
Anyway, I just uploaded a picture of the turbo so here it is. The 2 liter DP is for size reference....yeah I know it is big.

fc1jz

And this is the little thing they show in the auction.

fc1jz

More info, I know, I am a *****.
My turbine housing is nb085 as shown below for the t04e 60 trim... the rest of the specs match the t70 exactly. My compressor cover is NB012 and my compressor wheel size also matches that of the t70 coming in at 69.1mm. The turbine wheels on both the t04e 60 trim and the t70 are identical.

Info below:

T 70 - " P " .70 – Part #810009
810010 Cart. Assembly

807347 Turbine Wheel - TO4 ”P” Trim 64.5mm / 2.53” (Ind. 2.539”. Maj. 2.913”)

807408 Compressor Wheel - TO4P 69.11mm / 2.72” (Ind. 2.721” Maj. 3.582”)

806105 Turbine Housing - .70a/r NB040

807179 Compressor Housing - .70a/r TO4E NB012B

Rated 84lbs/min. (approximately 840bhp)

Retail = $855.95

Sale Price = $699.99

Full TO4E 60 Trim " P " Trim – Part #810011
810006 Cart. Assembly

807347 Turbine Wheel - TO4 "P" Trim 64.5 mm / 2.53” (Ind. 2.539”/ Maj. 2.913”)

807423 Compressor Wheel - T4 58.16mm / 2.28” (Ind. 2.289”/ Maj. 3.307”)

801137 Turbine Housing - .68a/r NB085

807549 Compressor Housing - .50a/r TO4E

Retail = $713.58

Sale Price = $549.95

IGY

Yes, AR. 68 p trim is small. You may have the problems you are worried about by running that AR.68 housing. All you need to do is buy a T4 AR .84 , 1.00, or 1.15 P trim exhaust housing for $200 and you have everything you need. .84 would be for stock porting,1.00 would be for side port with decent spool up, and the 1.15 would be for big side port with more power in mind and less worry about when it kicks in.

fc1jz

What I was hoping is that the .68 a/r turbine would make up for the giganticus compressor, and possibly make it spool before 4k and not die until 7500. Thats only a 3.5k powerband...Is that too much to ask from this turbine housing? I have seen 700hp supras run a small turbine like this with little to no top end loss...why can't I???

I am not looking for 700-800 hp here (which the turbo is capable of). I just want to run 1bar and be able to crank it up to 1.3 or so when I go to the track. I am really tempted to try the .68 and if it doesn't work, buy a .84. I definitely don't want to be too laggy like a 1.00 or 1.15 would be. Does anyone know if they make something in the .90 range? I have been looking and can't find one.

kabooski

dude sorry for this but seems your kinda new to rotaries and turbos

a T70 is not a efficient street compressor wheel
Steve Kan
Crispspeed
and many others
do not recommend them for the street
a T66 is a perfect strip/street turbo

you will chocke the F out of the turbo and over spin the turbo
with such a small turbine A/R
your not running a Honda
this is a rotary that pumps out a lot of air

good luck
you got a cheap turbo now be ready for cheap results

fc1jz

Remember, I didn't order the .68 a/r turbine housing. That is what was sent to me. That is why I am asking you guys if it is useable for my application and horsepower needs. If I was an expert, I wouldn't need to ask.
I know it is a cheap turbo, but it will get me through until I can afford a t66 ball bearing turbo (what I am saving for). And with this t70 I won't have to run 20psi to get 450whp like I would with a smaller turbo selection. I am running the stock map sensor with a power fc so I don't want to exceed 17-18 psi till I get a 3 bar.

Hey thanks for your input though, what turbine a/r would you recommend for a streetported motor wanting 450whp and a somewhat decent spool for this t70 turbo?

RacerXtreme7

iTrader: (2)

1.00 A/R tang divided, match that with a divided manifold. If you don't have the money for a divided manifold go .96 A/R tang open valute. Either combo should net you boost by 4k.

I'm in the Hampton Roads area of VA, were are you located?

~Mike....................

fc1jz

I am right off 460 in lynchburg. about 3.5 hours away.

I have a divided manifold already, so I should look for a 1.00 a/r?.....do you know of a good place to get one??
I definitely want the vband connection on the turbine.

RacerXtreme7

iTrader: (2)

CHEAPTURBO.COM , ATP turbo, theres some guy on thepartstrader.com selling turbos at a good price..... just look around. You can find individuals selling turbo's on ebay, just email them asking for the 1.00 A/R turbine and they should be able to help, if they sell garrett turbos, they can get any part.

Yeah, Lynchburg is about 3.5 hours. Theres a whole lot of nothing out that way..LOL.. (Crew, Appomatix, etc.)

~Mike...................

fc1jz

Yeah, there is a whole bunch of hillbilly's playin banjo music and **** while they ride around in there mustangs, no wait camaro's....no wait...mustangs...no its definitely camaro's....damnit where'd I put my chaw.

Then there is me and my homie, I have an FD he has a mk4 supra. I am accustomed to comments such as "how much rice you burn...kerhyuuk, I heard dems rotorem motors blow dem ding ole head gaskets like crazy"...I usually reply, yeah, the only headgasket a rotary has ever blown is the mustangs behind it...or is it camaro...damnit im confused again.

RacerXtreme7

iTrader: (2)

umm yeah..LOL....

rednecks galour..... you know their serious when there car has race paint on it. For you non-rednecks.... there race color is primer ) you know when there into custom interiors when they have either a Dixie or Rebel flag thumb tacked in place for a head liner. One last word... MULLETS

~Mike.....................

fc1jz

You know, I bet those black Billy Raye Cirus tank tops make there cars faster. And you know the stonewashed jeans have to help also.
As a matter of fact, Im sure I have heard of 2000+ hp with the proper tanktop/jean combination.

RacerXtreme7

iTrader: (2)

You seriously forgot one huge mod. The white high top shoes laced half way up so the tongue sticks out and hangs loose. Garenteed to give you a .05 second better 0-60 ft. time.

~Mike.........

Marshall

Try it with the .68, i ran my T-66 with a .70 without any problems.

fc1jz

Yeah they also reduce wheel hop and increase top speed, I heard.

fc1jz

You ran the .70 a/r on the turbine side? When did you spool? What size wastegate were you using?
Sorry for the bombardment, but I am really interested in how it may turn out (I know the t66 is smaller and spools faster).

Marshall

Yeah, it was spooling up pretty good in the 3000s with full boost somewhere around 4k. It made more power up top than alot of 1.0 and 1.15 hotside cars with an engine that was somewhat tired (hi 6s compression). It had the HKS 50mm wastegate.

Here ya go:
https://www.rx7club.com/showthread.p...ght=budget+t66

InJ3cted

server all screwed up
wrong nick

fc1jz

See, this is what my brain was telling me would happen...but all of the guys I talk to at home or on the boards tell me I could never get away with the .68.

With the numbers you put down with a t66, I can probably expect to get 400+/- to the wheels at 15lbs with a slightly later spool. Then I should be able to turn it up to 18psi at the track and get around 450whp.
Yeah, oneday I will get a larger turbine a/r so I can get serious numbers, but this will be fine for now.

fc1jz

By the way, I know I am a cheap bastard, but so far I have this much of my dough into my setup (all items are brand new, and prices are shipped to me):
ebay t70 Turbo+ Ebay divided manifold $500
HKS 40mm w/g $200
KGparts 2ndary Fuel Rail, adaptors for stock primary rail, braided fuel lines, aeromotive fpr and fp guage $450
1600cc injts $100
FMIC (no tubing) $400
Apexi Power FC+Commander (only thing not new) $900
Misc gaskets & flanges $50

Yeah I know, I got some good deals.
I still need to get some pipes fabbed and a downpipe fabbed but so far $2600 including power fc and commander isn't bad. I had 3k to spend, and I have a little over $400 left. I can probably get whats left with that, or maybe a little more $$.

Now, Commence to bashing....................