3drRich

Hi all just want to know if a gt3071 turbo will work well with my spec and if i need anything else?

Spec is:
Full rebuild including all new group a gaskets, belts arp bolts etc.
New 0.5 forged oversized pistons with valve cutouts.
bd14 & bd8 Cams.
Double valve springs.
Siemens 55s.
Rs500 style 60mm intercooler.
Alloy rad.
Verniers.
Uprated fuel pump & loom.
4" mongoose pipe.
Will be getting it live mapped once back in the car.

What sort of power figures will i be looking at 400bhp+ and will it drive ok?

BRAMMER

iTrader: (23)

First things first find the right tuner for you - then ask them as it's a near 500bhp turbo unit your looking at a decent engine build around a 200 block and long studded. I wouldn't use .5 at that power really.

Injectors are too small as well

Around that spec engine your looking at a Roller bearing T38 or maybe look in to what Borg warner turbo could supply that motor.

Find your tuner first though.

3drRich

Ok Brammer cheers. Im finding it difficult to get it right at the minute as no matter who you talk to or what you read people seem to get differnet figures from different engines.

Im quite happy with the spec so far but wanna know if i should port the head and what turbo?

Also dont want to have much lag and to much power so i have to change diff, gearbox etc.

Will i see 400bhp with a RB T38?

Rsmat

iTrader: (2)

By the sound of it you dying to get 400bhp ... To it properly with a t38 mate.. If your number chasing.... I'd be more happy with a car that drives nice than numbers...

3drRich

Hello Mat. I do want it to drive nice, dont really want to be waiting for loads of boost then be up the nearest tree when it comes on LOL! What are T38s like?

Im not very clued up to much on this as years ago when we had them we didint have the money to do it properly so just turned the boost up

3drRich

Oh just bought a tubular manifold with external wastgate to if that makes any difference!

scoooby slayer

iTrader: (4)

if youve got manifold and gate and gotta make up downpipe anyways get an efr the 500 hp one, thats what id do.

cossie daz

If someone in your area with a t38 car and a gt30 car try and get a ride out .
Like brammer said you need to find a tuner as ecu / chip / live map all come into play .

The thing is alot of people love a t38 and people hate it .
I got told by one tuner t34 up to 400bhp then gt30 and don't use a t38 .
Another said t38 and 430bhp .
It's a mine field around 400bhp as I've found out .

ajamesc

Your best bet is to pick who will map it and chat to them about what turbo to use!
Many people have different ideas as to what's best or what route to follow.
Different tuners have there own ways of doing things and there preferred bits to use

Rsmat

iTrader: (2)

Same here I choose the wring the neck off a T34 for 400 .. Never set off for that tho just wanted low lag and punch .

DazC

iTrader: (1)

If you've already got the manifold I'd get the GT30. For 400bhp I'd go for a GT2871 but they're internally gated so go for the GT30.

Rsmat

iTrader: (2)

Good call Daz ... It needs a night on the dyno disco

KSA-Cossie

iTrader: (4)

I've got a roller bearing T38 and love it , good for 460 bhp slightly less lag than my T34.63 I had on before it

cossieDavedree

Don't agree with the .5 piston bit. standard bore is 90.8, oversize is 91.3.
The bores can take 93mm although some have more material in the block than others so over 1mm you would then install liners.

scoooby slayer

iTrader: (4)

i agree on the bores, i ran a turkish 200 block on 0.5 overbore with a proper rs 500 t4 at 2.2 bar no issues.

BRAMMER

iTrader: (23)

I ran 0.5 bore on my last 205 engine at over 400 with 2.4bar on a T38 which some say shouldn't be done but it worked and didn't fail, But....

I spoke to one of the most reputable builders out there when i had plans for the new engine, a standard bore 200, long stud, virgin crank, and fully balanced was a must if building a proper engine to take a large turbo, big boost and for it to actually last.
My 3076 makes so much power high in the rev band i couldn't even imagine an engine spec the OP posted above to even make it through mapping never mind driving on the road hard.

IMO you speak to the best and see what they say, look at the best engines out there around this spec and see what they're running and which are producing the power and lasting.

As for the T38 i said that as the engine isn't up to anything other than this turbo pushing it, you can't throw a big blower on a weak engine simple.

Mark Shead

A 200 block is good for over 550hp and 500ftlb on a .5mm oversize after that I liner them and never seen a block problem on 550hp with bores.

Mark

cossieDavedree

The only people I trust is Julian Godfrey and Mark Shead.
i've been around the cossie yb/pinto block since 1998, So I know my around these old lumps. I'm not denying what you say isn't true, It comes down to putting together the best of the best so that the engine builder reduces the risk of an engine failure. But it doesnt mean a 205 block can't be used for mid 400's hp/torque, just be prepared of its weakness's to a 200 block when under stress.

The 200 block provides the best gasket seal from long studding, I just don't agree with the virgin bore theory on a cast block. Trying to find a +/-20 year old 200 block on an unmachined bore or a 200 block on 90.8 with little wear is next to impossible, or very costly. Then even with the big power say 550hp-600+ the cylinder pressures and bore wear will be wearing at such a rate that the lifetime of the engine is going to be reduced hugely. Thats where Liners come in and with liners if needs be you can go back to a standard bore size or larger everytime you either break a liner or piston, or the engine is tired.

The 200 block has meatier casting which effectively reduces the thread crack and bore crack issue, long studding increases the headgasket seal and lifetime of the headgasket, escort ybp has oil spray jets in the block. I have a spare 200 in my garden shed so put them side to side my 205 block to compare casting. Mate in portsmouth his escort cosworth cracked its bore on number 3 on stage 1 t25 power. My cousins original 3door 205 block cracked number 3 bore using a t34 at 32psi,But then his 2nd 205 engine lasted 5 years until he sold the car.My old saph after I sold it cracked not the bore but inbewtween n02 threadhole and water jacket on a t34


For a gt30.71 400-480hp then the mahles are getting close to their limit when at 500hp but depending on the map and how the engine is built then mahles would be ok. The cossie cranks are almost perfectly balanced from factory anyway but yeah each piston needs to be weight matched, then whole reciprocating items including flywheel and clutch housing balanced as one.

The factors to block reliability are , pot luck !! and how many thermal workloads its had and how much boost you are going to run and whether its going to be race engine or a fast road engine. Over 500 hp I would be using liners anyway.
Rod tarrys cracked i believe on his topspeed run, but then I don't think anyone has produced the torque Mark has been able to achieve. !

Each tuner has their own way to make the power, sheady loves his boost so everything has to be strong but then his engines will produce the torque and power with reliability. Back in the day it was low compression and whack a t4 on there, now with refined aftermarker managament and progress in turbos and engine components, it can be standard comp or slight drop to 7.8:1 and provide a much more responsive engine than a t4 on the road.

3drRich

Cheers for all your input guys really appreciate it. Its alot to take in LOL!

I know im on that limit where things change dramatically at 400bhp but that or anything over that i will be made up with all i want is to make sure its strong reliable and as less lag as poss!

If i bought a gt30 could i not just turn the boost down abit or dosent it work like that

Also whos the best man for the mapping etc close to southampton?

xr2wishy

iTrader: (2)

GT3071 is a cracking turbo, i ran one on my 2.1 zetec turbo, tubular manifold etc. and constantly spun the wheels when up to 2.0BAR holding pressure.
dropped lag and pulled right up the revs, i guess you've got to consider cost, but see no reason for a T38 apart from cost and the fact a T series takes a beating and cheap to rebuild if it goes wrong.
these EFR's are a whole new league though, proper twin scroll turbo setup.

3drRich

Mark do you think i should see over 400 with my spec and a gt30 without porting the head or any other mods?

Mark Shead

Yes.

Mark

3drRich

Its a tough call between the gt30 and the RB t38 as everyone seems to have different opinions.

Just wanna make sure i get it right

ajamesc

Take it to mark then it will be right lol

Rsmat

iTrader: (2)

What you should be asking is will it drive nice and make 400..mate I'd rather have 200
And a car that drives nice than 400 and one that drives like a pile Of shit !... As stated take it to mark or your choice of mapper and you can't go wrong mate

3drRich

I have now made my mind up and definatly want over 400bhp. This used to be the figure to go for without any issues but now with all the latest technology apparently you can have more bhp and drive ability

I am now thinking gtx3071 as these spool quicker. Ideally I want to be a around 450bhp.

I am going to pick a tuner shortly but wanna know if you guys think this is realistic with my spec?

Cheers

3drRich

Latest spec

Spec is:
Full rebuild including all new group a gaskets, belts arp bolts etc.
New 0.5 forged oversized pistons with valve cutouts.
bd14 & bd8 Cams.
Double valve springs.
Siemens 55s.
Rs500 style 60mm intercooler.
Alloy rad.
Verniers.
Uprated fuel pump & loom.
4" mongoose pipe.
Gtx3071 with external waste gate

Will be getting it live mapped once back Inge car.

Wanna see 450bhp, possible?

J1mbo

iTrader: (1)

Don't use a gtx3071 it will surge especially with small cams and no head work, a ported shroud will see around that but entirely pointless IMHO.

A gt3071 will be the best bet it's good for 500bhp so with your spec 450 at 30psi should just be doable but a ported head and a bigger inlet cam would see massive gains

Jim

MrC

I'm still up for a dyno disco night we need to get stu to agree again and not at the last minute when we've consumed to many bevvies Lol

Mark Shead

I just mapped a Bw efr 7064 on a yb and full boost 2.5 bar in 5th 3400rpm and blows away any garret turbo in the same hp range I have tested.

Mark

3drRich

I'm not sure I wanna go that mad just yet mark plus I might be buying the gtx off someone on here.

Where abouts are you based as I haven't decided on a tuner yet?

Also what do you think of my spec now, will it make 450bhp and should I have the head ported?

ClevoCapri

iTrader: (1)

Was this a T3 single scroll turbo on a std manifold?
Do they bolt straight on to a std 2wd exhaust manifold?
Im looking for a new turbo and have been trying to find some results of one of these on a YB! So any info you could give me would be awsome!

Cheers

Mark Shead

Its on a twin Scroll manifold, The T3 flange wont fit the 2wd manifold and a diff link pipe would need to be made.

Mark

scoooby slayer

iTrader: (4)

excellent result mark, what power did it make ?

Mark Shead

It should be on the dyno Monday if its g/box holds out at the pod tomorrow.

Mark

LHD220Turbo

iTrader: (4)

what power do you predict? or hoping for?

Mark Shead

470 to 480hp.

Mark

crazycage

is it not rated to 560hp?

MarkTurbo

Be interesting to see what power this makes as i'm looking at this turbo to replace my 3071 that lasted 4000 miles and failed due to Garretts crappy plastic bearing cages

Mark, is the 470-480 bhp you're expecting what it'll do flat out at 2.5 bar? I've got a 2.3 stroker in my gti-r and thats exactly the power level i'm aiming for but if it needs that much boost would i be better off with the 7670?

Sorry for the thread hijack but theres not much info on the Borg warners around on the Nissan sites

Mark Shead

It made 518hp and 520ftlb, Not posting it on here it will be on the Escort forum.

Mark