Took a chance on the ebay t70!!!!
 

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???:confused:

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.

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

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.

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.
http://images.auctionworks.com/hi/55...7_exposure.jpg

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

http://images.auctionworks.com/hi/55...theirturbo.jpg

More info, I know, I am a whore.
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

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.

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.

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

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?

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....................

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.

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...................

Yeah, there is a whole bunch of hillbilly's playin banjo music and shit 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.

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.....................

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.

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.........

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

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

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).

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

server all screwed up
wrong nick

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.

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....................

Im not at all impressed with 379 to the wheels
at 15.5-17 PSI on his dyno sheets

I think that is VERY sad Mod-to-HP ratio

I made a bit over 400 at only 14PSI with a T66 .81 Hotside
11.72@118



Marshall should post what his car has run in the 1/4
and especially the MPH in that run that will indiciate how the car pulls with such a small A/R

Hey you have your mind made up
so go for it and we shall see who is right
thats the only way to do it
put real to potential too task

I am just going to try. What will that hurt? I can put it on there, see what happens, and then make an educated decision. If power drops like an aging titty after 6k, I will come on here and tell you that you are the king. If not, I will say Marshall is the king. The competition has begun:boxing:

I am sure surgemonster will jump in here soon. He also used a t66 with a very small exhaust side and did some pretty good things with it. If he doesn't jump in here you might want to shoot him a pm. he'll answer all your questions about it. BTW that turbo is ssautochrome's "GT45". he kind of names his turbos what ever he wants so if its confusing thats why.

Yeah, I noticed he doesn't use the "traditional" methods when describing a turbo. But hey, to each his own, he is still a top notch seller in my book. I think I will be happy with the outcome from what I am hearing.:D 400whp here we come!!!!!

120 mph, thats 2 more than 118 :)
Like I said, comp was in the high 6s. Just giving him an idea that it doesn't choke the engine above 6k.

not really pal

at the track the best MPH is 119.97
so you got me by .003 tenths :D

Hmmmm....you have more horseys and he still beat your trap speed. Do you think that could be because of spool time?? His turbo is in its powerband sooner, thus increasing his trap speed and lowering et's???

Perhaps a 4th gear pull on the hwy would show the advantages of a larger a/r turbine, but the advantages don't seem to show up on the street and strip.

As far as daily driveability and the occasional auto x, It seems that using a smaller turbine will allow you to run a larger turbo without sacrificing driveability.

Well done Marshall.;)

Not bashing but you need:

Fuel pump
down pipe/pipe for wastegate too

I commend you on doing it on a budget however I myself would have went the extra mile to get a new garrett peice rather than buying the ebay t70.. but that's just me.

OH yeah, I allready have a fuel pump, came with the car when I bought it. I just have to install it. It is a walbro 255.
And I was figuring the dump tube with the DP since I am having it exit through the exhaust rather than open air. I already have a gutted hi-flo cat/midpipe (for that emissions friendly look) and a catback.

why has he not stated the 1/4 mile time?

theres no excuse (traction issues etc)

I ran 12.3 on plain plain street tires
with a 2.2 60"

besides next time I hit the track im going for 10's :

Also remember I have a FC
FD trannies have slight diffrent gear ratios

Good point...

nice 60", what type and size of street tires were you running?

Toyo proxies

255/50/16

the 11 second pass was done on 255/50/16 BFG drag radials with a 1.63 60'

how much wheelspin in either run??

sorry, 12.20-12.40s @ 120, 2.1-ish 60's, street tires.

Going easy on the car to get a few traps.


....I find it quite funny we get questioned so heavily for .70s or .68s on T4 footprints when a 1.06 AR GT3540 (T3 footprint) is roughly the same size. Nobody slams 3540 owners.

Nice, I would be happy with those numbers indeed.

Anyone remember the wheelspin factor during these runs??? Do you have anything done to prevent hop??

My car hops like a horny bunny when I get wheelspin.
I need to get a diff brace.

I'd give it a shot. You may be very surprised at how
well it works. I have gone down on the turbine a/r
against conventional thought with very good results.

I am almost done with the conversion now. Manifold fit good except The w/g flange holes were tapped crooked so I had to drill them out, and use nuts/washers to attach the w/g.
Turbo is hooked up with braided ss oil feed and return lines (fabbed at local machine shop).
Next step is installing the fuel system.
Power FC came in yesterday :D So I will be installing that as well.
My intercooler is at the machine shop getting reworked for a custom setup to utilize the vents in my CF hood. I am hoping for a sort of venturi effect on the intercooler.

I will keep everyone posted and I will take some pics soon.

Whats left:
Custom fab Downpipe and wastegate dump tube.
Custom fab Intercooler tubing
Couple more block off plates
Install Fuel Rail/ss fuel line
Install and tune Power FC
And I am sure a few other things I am forgetting

Did my fuel today. Need to know if i need to run resistors with 1600cc bosch injectors. And if I do, what specs on the resistor.

Heres what I wrote about putting in the fuel rail/injectors.
https://www.rx7club.com//showthread....hreadid=299149

I was running 125mph with upgraded BNR stage 3 twins

STEPHEN

Thats impossible Stephen! You're choking the motor with those stock exhaust housings.

:)

just curious of any updates on this turbo man,...

me too

me 2

>I was running 125mph with upgraded BNR stage 3 twins

Thats impossible Stephen! You're choking the motor with those stock exhaust housings.<


Yeh, impossible :-)

I only did it 4 times with stock non-seq twins !!!!