the purpose of blade cut back is to reduce the turbine shaft speed to tolerable levels at high boost.
Nissan did not cut the blades back but chose to remove some I have a version of cossies turbo's we have tested this on with very interesting results,unfortunately the results are not TUV approved lol

 

People dont get hung up on boost levels, My own Escort made 402hp on 24psi but remember I did run 37psi in the mid range and the turbo was flat out and could not make any more boost at the top as the engine was consuming all the air the turbo could supply,
A stock engine wont make the same hp as the airflow is completly diff.

Mark

 

My blades on my T34 turbos used to remove themselves when running 37psi peaks - perhaps they were trying to emulate the Nissan turbos .

 

As has been said up to about 380 hp is poss. Mine was livemapped to run a 32psi spike and 24 at the limiter which was etimated at over 360 hp by the mapper, but the turbo has shat itself within 2k miles. It is a lottery how long it'll last at 2bar of boost.

 

The cutback limits turbine speed but improves gasflow so at the higher rev range it will improve power. The trade in is turbine response at low gas speeds.

A T34 can make 370bhp at 1.6bar no problem. What you have to remember is your all looking at BOOST, and boost doesnt make horsepower, airflow does. People on this forum really must stop concentrating on boost pressure and start thinking about airflow.

A standard YB normally drops to around this sort of boost figure from 5500rpm upwards as its consuming more air than the T34 turbo can produce, and it can make the sort of power figures suggested with that air pressure on a good engine and map.

Dont forget, owners only EVER quote peak boost figures, which leads Joe Public to think that figure gives the power, it doesnt, it invariably produces only the peak torque figure. You will find teh boost has almost always dropped considerably by the time your at peak power making engines speeds


Food for thought:
I am sure you all understand that a GT40 would manage 370bhp at 1.6bar no problem, in fact, you woudl struggle to limit it so low. Give that some thought and if it doesnt help you to understand the airflow/boost isue, ive written an article that may help more, accessible via my siggy.

 

Oh sheep, two pages. Beaten to it by Mark and Tony. Doh!

 

Well thank you stu even tho a dont know you lol. the car has got a gas flowed, ported, polished head, inlet to match didnt think a was going mad like lol just looked at map and its peaking at 1.9 bar and holding 1.5 bar so wasnt even 1.6 my mistake.so back to origin of thread could i get more out of it wivout ringing the neck out the turbo

 

you will see 390/400+ with t34.63 (30+ psi) with cams /ported head on 97 ron they will make a bit more on race fuel map

 

Stu,
If you had a std comp engine , running Blacks, 500 cooler etc, what turbo would you say is best for 380 bhp in both lag, drivability and power?

UT T38.63
or
T34 .63 with 360 deg bearing


Honesty please!

 

The UT would have an easier time and last longer.
The T34 would give better low end responce, but potentially be more unreliable as it would run higher turbine speeds on boost.

Depends what you want it really does.

 

ive a t34 on my saph but dont know what housing, whats the easiest way to find out what housing you have?

 

Take a look, it says on it. Loo for an A/R Number near the flange/scroll intersection.

 

didnt no that, was never really bothered tbh but was reading this thread and just wondered what one i had

cheers for the reply

 

answered this many times, mine runs T34.48 mapped by mark runs a proven 391hp 430lbft... so saying they cant handle good power is rubbish, its stil as good the day it was fitted....

 

Trade in on response, that might explain it. I've driven the car a couple a trackdays, It's far from spiky, As revs go up the the turbo gradually boosts up to 1,8bar and stays there without boostspike. And it keeps pulling well into the 6K, (haven't dared flooring it to rev limiter )
(much different than a t3 on a saph, wich suddenly pulls strong but higher in revs it stops pulling)
Powerwise, as far as i know the engine has standardish spec internals but with this turbo, greys, airfilter/exhaust.
Would you say this turbo is a bit ott, or oke for track use?

regards, Rinus

 

great for track use as thats the sort of use that requires a turbo to be most reliable as its life is much harder than that of a road cars.

 

erm.... 391bhp on a T34 .48 ?

 

Hes been to Engine Advantages

Steve.

 

Adam,

Not picking here, but that seems an aweful lot of power for that housing..maybe i,m wrong though.........

 

yes... its BOLLOCKS in other words

Talking of T34's....

look what I bought! mmmmmmmm!!!

BRAND new, not reconned genuine T34.63! only the best for my little bathtub!


sorry for wank photos of Stus nerdberry!







not long now!

 

Only managed to get 3200 mls out of a t35 from turbo technics running 1.8bar that was fitted in August 08 been to portugal and back and its smoking really bad.

 

HTH

 

Adam,

So .48 housings do get near on 400 bhp then.

 

Shit thats not good man! hope u sort it

p.s soz didnt txt back other day had no credit,will drop cage round by end of week

 

think the graph says it all,cant see wny people just try to belittle people on here,like there lying all the time making figures off the top off their heads,been couple posts on here where people have said something and then someone has tried to knock them down only for someone to come on wiv some ACTUAL knowledge and put things right, think thats why its good to have some of the countries top tuners on this site to actually help people and give good honest advice

 

wow... you couldn't be MORE wrong if you tried!!!!

Think YOU should understand what that graph actually means!!!

NOTHING!!!

Dynos and rolling roads can be manipulated to read anything!!!!!

Top tuners advice?!??! thats not what I would call the dude who posted that graph!!!


he is just some bloke that posted a graph!!! that graph came from some company HE PAID!!! THEY HAVE TOLD HIM WHAT HE WANTS TO HEAR!!!! jesus...

The Sunday Sport has said Elvis lives on the moon. They put it on the front page... do you believe that as well?

a T34.48 can't make that power in my opinion. I would like to hear from a 'Top Tuner' or a proper expert to tell me different!!!!

then I would listen!!!

YOU WERE PROMPTLY AND POLITELY GIVEN THE CORRECT INFORMATION YOU REQUIRED AT THE BEGINNING OF THE THREAD.

 

Jesus Christ, someone getting a bit too big for their boots?

Sorry Mike, its just what I read

 

Mike?

 

My 3dr has a t.34 with a 48 housing running closed loop and mapped by Stu at MSD and when recently rolling roaded it recorded 374 bhp and 348lbs/ft peaking at 32psi and holding 28psi and its been on the car 3 years and done at least 15000 miles.

 

I was replying to Mike as well!

 

if all rollers were accurate my saph would have over 450lbs of torque when i was running 330-350bhp

 

I,m with Porkie on this one too, Graphs are great for your ego and pub talk, but it,s how the baby goes on the road where it counts...

And a well setup T34 Cossie is a FANTASTIC Road/track car imo..

 

Tell Paul Simmo that

 

Who,s Paul Simmo James??

 

He said he was possibly having the T38 off you when you were gonna sell it, I told him not to bother cos he'd need headwork etc, and to just slap a T34 on it

 

Oh, didn,t realise that was his last name..

Now i know why his username is simmosaph..

 

I think his surname is actually Simmons (Possibly with a d I can't remember)

 

Simmosaph now James, he,s just PM,d me...

 

Well aren't you keeping the T38 now anyway He will be gutted

 

No, he,s getting a T34 now anyway he says..

We,d better stop fooking this thread up....