Lopsided99

So i have a 87 Turbo 2, and i want to know how much power i can get out of my setup. And what is the max amount of boost i can run on the motor safely as long as i keep a good afr.
this is my setup

87 Turbo 2 motor ported and polished
550cc primaries
750cc secondaries
greddy throttle body
greddy front mount
greddy TD06 20G turbo
2.5 greddy down pipe, test pipe, and catback.
Tial BOV
Koyo Radiatior
Rtek ECU (retards timing 1degree for every lb of boost over 9lbs.)
Greddy bspec boost controller
greddy turbo timer
apex AFC
Fidanza Flywheel
stage 3 ACT clutch
factory oil pump removed and plated off

SirCygnus

iTrader: (1)

why do you have an rtek and an AFC??

Rtek ECU (retards timing 1degree for every lb of boost over 9lbs.)???
i would retard it a lil bit more but thats just me.

Lopsided99

Alright i'll see about retarding it a little more, but do u know what i could get out of my setup as far as a safe boost? i was thinking 16 but hoping for like 18? is that possible?

RotaryRocket88

iTrader: (7)

If you're making 348WHP @ 12PSI like your sig claims, then your injectors are maxing out and you're running lean. With a walbro and 750cc secondaries, 300WHP or less is basically the limit on "safe" power. From what I've seen, people running more than that kind of power usually use bosch 1680cc secondaries.

If I were you, I'd be running STOCK boost until you upgrade the fuel system.

junito1

that greddy 20g turbo kit cliams around 400hp at around 15 psi

Pretty big turbo.

I wouldnt go higher than 7 psi as is.
One more thing, I believe the rtek ecu's are sent back to the costumer in completely stock form. (stock timing maps) It is up to the owner to tune safely at anything above 8 psi.

Lopsided99

the thing is, i'm not going lean when i was running 12psi though. i get like 11.5-12.5

AUGieDogie

iTrader: (4)

My guess is that the Rtek he has isn't the tunable 2.0 version, but probably the 1.7.
Do yourself a favor and sell the safc and upgrade to the rtek 2.1. Then you can run 720s x4 and tune your car much more as well. Also go to the rtek section of the forum to find out how to run larger secondarys.

Oh and i didn't see a fuel pump listed. I hope you are running an FD pump or better a walbro.

Lopsided99

got a walbro, forgot to add that one on there. I bought the car with the rtek on it already so i'm not sure which one it is, let alone how to tune off of it. I only know how to tune on the apex AFC.

Lopsided99

i have a walbro 255lph fuel pump, and i just upgraded to 1600cc secondary injectors today. So you think i could boost 15 -17lbs now with a good tune?

2-N-D-pink

iTrader: (27)

Big?

I never though mitsubishi turbo were big. Their exhaust is just too small for a rotary. I dont know what A/R housing that turbo is using, but I can tell you is probably not .96 or bigger. Anything smaller than that is just too small. 1st you wont have enough exhaust flow. 2nd, your gonna get alot of heat in your engine, manifold and turbine housing. And 3rd youll have high exhaust temps. If you look at full blown T4 flange and compare it with a TD06 flange, the T4 will dog over the exhaust flange that the 20g turbo brings. Im not sure how youll planning anything over 300 hp with an itty bitty turbo. Also what do you mean "factory oil pump removed and plated off?" Is this a dry sump set up?

Lopsided99

Actually the exhaust flange on the turbo is t4, ill gladly take a big pic of it for you. so it sounds like your pretty much dissin my car i guess. Runs nice and cool actually, getting good AFR's and everything, and the EGT's aren't bad. So before you come on here and nock someone's setup, do a little research...

Aaron Cake

iTrader: (1)

I agree with 2-N-D-pink, that's a small turbo and it's:

1. Remarkable you are making 350RWHP with it
2. Remarkable you are making 350RWHP with those injectors and no fuel pump upgrade

How much you can push the turbo will depend on how much fuel you have, and when it stops making power. Increase the boost until you see the IATs heat up and the turbo makes no more power. However I suspect you are at or past the limit of the turbine.

2-N-D-pink

iTrader: (27)

I wasnt nocking on your set up. My point was, small turbos cannot breath on a rotary. 20g turbos come on EVOs and such. Greddy changes some things here and there but personally, I think they're just too small.

And yes I would like to see a T4 and your TD06 flange together for comparison.

2-N-D-pink

iTrader: (27)

Thank you. My IAT = 58C on my stock turbo at 12 psi. With your 20g I dont think its any diffrent. And your wanting more boost. Ludacris....

junito1

I wasnt comparing it to a t88 or anything.. geez.. bust my chops.
Turbo can handle around 400+ depending on diff housing/wheel options Greddy/Trust offered.

But its big enough to run his fuel set up lean.
Now, you said you installed 1600 injectors on there? Without any tuning?

What is the current set up on the car now. ANd how is it running.


Oh. and to clear it up. evos come with 16g's that have been known to push 390awhp with 26+psi.(tuned ecu's and cammed engines)
They never came with 20g's. Except in maybe a few special editions that produced near 340 plus hp

Lopsided99

ive tuned the 1600's to run on 7psi for right now. i want to do more and i know i can keep the AFR good. Whats a safe boost now you think with the 1600's in? And i just got home and its dark out, ill take a pic of the T4 on the turbo tomorrow. Maybe i'm wrong about it being a 20g, it thought that was the only kit greddy offered for the FC. But i am POSITIVE it says t4 on the side of the turbo. So, to answer my question... safe boost with the 1600's in now with a good tune?

arghx

iTrader: (3)

0% chance you will ever get a 400whp on a 20G on an Rx-7. 25G maybe.

2-N-D-pink

iTrader: (27)

Yes...1600cc is more than enough for 7 psi. I just wanna give you some info. Not to rag on your turbo but, if your looking for more CFM and a better life for your engine, I suggest upgrading your turbo.

Neither was I, Im thinking about T04b or T04s....

Aaron Cake

iTrader: (1)

That's a piston engine. There is no comparison to the rotary. Piston engines run tiny turbos.

As it was said, if you have enough fuel and intercooler just keep turning up the boost until the IATs heat up and the turbo stops making power. At that point you've maxed the turbo.

Boost numbers are also irrelevant. It's all about airflow. Maybe the turbo makes great power at 10 PSI, only a little more at 14 PSI, but then a tonne more at 16 PSI. Airflow vs. pressure. Check the compressor map.

Lopsided99

well i believe i've solved the mystery. hah, it seems to be a T04 turbo. i took a pic just to show you guys. So knowing this, i think i will try to tune it for 15psi.

Aaron Cake

iTrader: (1)

OK, now we are getting somewhere. It's a T04.

However T4 only describes a family of turbos. T4 turbos make anywhere from 200HP to 2000 HP or so. There are endless variations within the T4 family.

Any more numbers on that compressor?

junito1

But, its starting to look like he pieced the turbo kit together. SO it could be anything like aroncake said.

The picture shows a internal wastegate t4? This is obviously not a greddy turbo.
And what did you do with the external wastegate flange on the greddy manifold?

Lopsided99

the only other thing there is an A on the compressor housing, and on the rectangular spot where the serial number is, it says BNR 0037.

NJGreenBudd

iTrader: (1)

BNR, like BNR Supercars?

Maybe stage 2 or 3??

87-88 BNR Stage 2

If it is your looking at 330-360rwhp at 14-16psi, according to their site, depending on which stage it is.

Aaron Cake

iTrader: (1)

Mystery solved. It's a hybrid stock turbo.