SPOautos

I was wondering if anyone around here is running a T70 on a street ported motor? If so what kind of numbers (dyno or track) are you making on pump gas and race gas? Anyone want to give me a rough idea as to what rpm a T70 would hit 17psi with a street port and a good exh manifold?

Thanks,
STEPHEN

BoostedRex

That's a HUGE turbo. I don't think I've heard of anyone running one that big with anything less than a half bridge. Most people would run a full bridge with something that big. You should get a hold of Crisspeed. He has put down some incredible numbers with some huge turbos. Best of luck. You scrapping the BNR Stage 3's?

Zach

SPOautos

Hmm, I wouldnt say scrapping them cause I really like them. I'm just getting HP gready is all haha

I'm kinda looking for the OVER 500rwhp mark and I want to get as close to 500rw as possible on pump gas. I know Chris made that on pump but his setup is to different to compare. He was running a half bridge but he also has low compression rotors so I'm not really sure how that stackes up to my car. According to the flow maps I should be able to make 500rw on pump gas but I was hoping someone was running one on a streetport and could chime in with some info.

T70 is a big *** turbo though and I'm not sure if I'm ready for the slow responce I'm afraid its going to have.

Anyone know if there is any chance that it would make 17psi before 5K rpms?

Thanks for the info,
STEPHEN

BoostedRex

I know if you don't mind running water injection then you can pull 500rwhp on pump gas with a T66 or a T04R. I don't know how you feel about water injection though. I think that it might be a forgone conclusion for my setup though. Always something to consider.

Zach

Heath

iTrader: (11)

My buddy had a half bridge with a T-70. I would say full boost was hit around 5k. It was a beast and I only rode in it at 15psi. He had it tuned to 25psi.

jspecracer7

Stephen,

contact Dragon(Chris). He ran a T-70 on his 13B(pre-20B days obviously). I'm almost certain that the T-70 and the HKS T-51R Kai share the same compressor wheel measurements.

allrotor93

iTrader: (126)

there is a video of a bb t70 car around here. search the name stevenoz. dont think about the non bb version.

Heath

iTrader: (11)

I know he compressor wheel looks like it could take your arm off

SPOautos

Thanks for the info man, I'll shoot him a PM

STEPHEN

Marcel Burkett

A guy down here made 525 bhp @ 26 psi on race gas on a street ported motor recently , I dont know when/how it spooled though.

SPOautos

525 @ 26psi sounds low.....what kind of dyno was he one? Does it read different from a dynojet? I'm wanting more like 475RWhp @ around 18psi.....dont know if it'll happen though

With 26-27psi people have made up closer to 540rwhp and that was with just a T66. I compared the flow charts for a T70 and T66 and the T70 flows a lot more cfm at a given boost than a T66 does.

STEPHEN

93 R1

Dragon was making some serious ******* power with his. If you want 500 on the pump though you should definately look into water injection.

I plan on running a T66-T70 sized turbo on my half bridge FD coming up here real soon after talking with many "wisemen". I'm shooting for about the same numbers as you are. You might want to consider a T66 if you are worried about spooling times but still want buge top end and big numbers.

SPOautos

Well, I was thinking about a T66 but according to the compressor maps a T70 flows about 220cfm more at the same boost and it looked like it was going to take a T70 to nail down 500rw on pump gas at around 17-18psi.

FWIW - Steve Kan used to run a T66 and at 17psi on pump gas he was making about 440rwhp, I'm not even sure I can get to 500rw even with a T70 but I should at least get close.

STEPHEN

Mr rx-7 tt

iTrader: (5)

Jason made 506 rwhp at 19 psi witha T-78/GT79.

pluto

Hey Stephen,
T70 has a really crappy compressor map compared to T66 or T72. I wouldn't use it if I were you. on top of that, surge limit sucks....

pluto

HKS T51R KAI is equivalent to a T72. The HKS T51 SPL is quivalent to a T76...

sub-zero

Stephen, I am rewheeling My turbo from a T-72 to the new Garret GT63/67mm cover and wheel. I was going to go with the T-66 and looked into this new wheel design that flows more. So a instead of a T-66 wheel I am using this new Garret that should flow more then the T-66 but spool a bit quicker? I am not saying that this is not all hype but I am trying it anyways and thought You might want to look into it.

SPOautos

It could be that I'm not looking at it right but the T70 and T72 seemed to flow about the same lbs/min at the same pressure and rpm. But yea, now that I compared the 2 side by side the T72 does have a better surge limit.

Could be that I'm not looking at it right though. I'm not exactly sure how the rpms affects it. Do you find the pressure your going to run, the go out to the right to the rpm line, then go down and that tells you the lbs/min it should flow in theory? I figured I'm going to need between 65-70lbs/min to get close to 500rwhp @ 17-18psi of boost.

The only thing that sucks is I happen to know where I can get a T70 for CHEAP (as in almost free ), it sucks pretty bad that I might not be able to use it

STEPHEN

SPOautos

Why? You not like the T72? What was the probs with the T72, was it just TO hard to get it going? Any idea what rpm you hit 17psi of boost?

Were you running a streetport?

STEPHEN

pluto

You always want to look at the map having 4 (not exactly straight line) going clock wise to see where you think the flow would be in between shifts. as you shift, pressure drop and so is air flow, when you get back on it, pressure increases but not necessary the air flow so surge limit come into play. How long it stays in the surge limit or near it will play a major roll on how the turbo will flow at mid range rpm. alot of it will depend on the exhaust back pressure and BSFC of your engine.

pluto

You have to remembered that this is not an aviation appliation where rpm stays constant so surge limit is very important.

SPOautos

Ahh, ok.

I wonder if I can get Bryan to put a T72 compressor wheel on that T70 turbo.....I guess I need to ask him and find out.

Steve, did you ever run a T72? You have a rough guess as to when I'd start making power with it? We talking 4500, 5500, 6500? I know its not going to build boost fast but it should make a lot of power even at low boost levels so maybe it won't be unbearable...what do you think

STEPHEN

pluto

We'll talk more on AIM

sub-zero

4500 I had " full boost" or that is where You held on from there to 9000 RPM. Like Pluto said if You did not hit Your 3rd gear perfect You were right on that surge limit and either You hit the gear perfect and You went like Hell or You might do a slight " bog". I ran 18 PSI everyday and that is not enough boost for a T-72. When I ran 24 it really started to be insane.

This is on a street port.

I have a T-72 wheel and cover if You are interested.

SPOautos

Subzero - I just sent you a IM

STEPHEN