Norwegian Wolf

Have a Sapphire Cosworth 2wd that needs a new turbo.
Have ran a Garrett T34 a/r .63 stg.3 hybrid turbo with cutback blades etc. at 2,1 bar
30psi on it until recently.
But this broke e couple of weeks ago.
The turbo has been the limiter of the engine, and now i want a bigger turbo.

spec:
200block, new balanced crank, polished and weightbalanced conrods,
JE lowcomp pistons, highpressure oilpump, professionaly portet 2wd head,
full head job, solid lifters, specialmade cams (about the spec of BD16 cams. could post the spec if requested), adjustable Kent camvernies, greys (Bosch 403), plenumspacer,
MSD 6A ingitionmodule, Mallory coil, 400chip, Ford Motorsport plugleads, NGK sparkplugs,
RS500 intercooler, 3" Mongoose, Bailey turbodamper, 2wd manifold, 3 Bar MAP-sensor, KN filter, Grp. A headgasket, ARP-studs, Grp. A cambelt and tensioner, bigger fuelpump, Samcos, hd bearings, new waterpump etc etc.

And i am going for a bigger spec this winter.
New exhaust manifold, swedish style inlet, bigger injectors (650cc), remap and new bigger turbo.
But the question is, which turbo..
Have thought about a GT30 (71/76..), Turbonetics T4 of some kind, Garret T4 BB or something like that. No preference actually..

I haven't got the need for breaking 500hp, but 450+ with pretty good responce is what i want.
Any ideas? Whould highly apriciate any ideas, or tips about who i could ask..

Running 3,62 Quaife now, but changing to 3,91 this winter.

Will be used mostly on the road, but also a couple of trackdays.

Kristian
__________________

Norwegian Wolf

Anyone have an idea?

F1

i have no idea, but do you have some photos of your car

KSA-Cossie

iTrader: (4)

GT 30 m8.

Norwegian Wolf

Gt30.. So many different GT30 availeble at the moment...
3071, 3076, ar 63, ar 84 etc..
Have you seen any cossies with a good working engine and a GT30?
Spool up etc.?
A little bit worried it wouldn't work with my cams, close to BD16 spec...

Norwegian Wolf

A couple of pictures as requested:

Norwegian Wolf

Anyone?
Seen many discussions in here about t38, gt30, gt35 etc etc.
so i know its people in here with both knowledge and experience

Norwegian Wolf

Any suggestions?

westus1

iTrader: (6)

been in plenty of cars with t34's and a couple of t38's and a few t4's, always thought the t38 was a good compromise, now having experienced a gt35 and 2 gt30's i assure you that this is the way to go these days, i will be getting a gt30 for mine over the winter

marky_g

T66 lol

J1mbo

iTrader: (1)

if you only want 450 then t38 is a very good turbo and dosnt come on boost with a boot up the arse like a t4 lol ! (good for 2wd ???)
if wanting anything over 450 then go gt30 76(i think) with 63 exhaust housing but if going for 500bhp the 82 exhaust housing should be used due to back pressure hope this help a little im not sure how your cams would be woth this set up though !

jim

Norwegian Wolf

I thinking about going the GT30 way.
I'm thinking about a GT3076R with either a .63 housing or a .78 divided.
I'm going for a custom made manifold, so the choice of flange is optional.
I have been told that a GT3076R with a .78 divided housing and a
tubular manifold with T3 divided flange will work allright..

I want something in the 450-500bhp range. Its not a must to break 500, but as close as possible without loosing too much spool up..
I don't want a T38 turbo, since i think it will be too small..

If somebody have a better tip than a GT3076 let me know

cossie daz

t38 up to 450bhp mate,maybe a roller bearing t4 would be good if u want under 500bhp

Norwegian Wolf

I want to be close to 500hp if possible, so i don't think a T38 will be the best for me..
I've heard a lot of talk about these T4 BB, but i haven't seen any dyno papers of one.
And a compressor map seems to be impossible to find..
So i am not sure if i dare to take that route, when everything seems so mysterious..

And i have many positive comments about GT3076R with similar spec to what i'm building this winter.. So i'm more interested in a turbo like that actually..
Much easier to sell too, if i'm not happy about it..

Norwegian Wolf

Any tips?
Anyone in here who have tried the GT3076R?

Charlie Chalk

iTrader: (1)

CossieRich made 453bhp with a GT3071.86, your best bet would be the 3076 at a guess.


cool pics

Mark Shead

A GT3076 is best for 500hp, Dont go for a split pulse divided housing at .78 you would need a 1.06 as a min,
A open scroll housing then a .82 works very well.

Mark

Norwegian Wolf

Okay
But wouldn't it be quite laggy with a 1.06 housing?
It's not a must to break 500bhp, cause i want a ok spool up..
Is a .82 better than a .78 divided?

Mark Shead

When using a split pulse diveded housing turbo the normal sizing does not apply,
The .78 would be about a .5ar in a open/normal scroll housing, a 1.06 would have better spool than a .63 housing with less exhaust back pressure,
The .82 is much better than a .78 divided the .78 will surge bad and limit HP .

Mark

Norwegian Wolf

Ah, i see
Interesting..
The .78 divided is that small?
Is 1.06 divided possible on a GT3076R?
And how will a .82 be compared to a 1.06?
Have the possibility to have a divided flange on the manifold as well.

What housing would you recommend, Mark?

Mark Shead

Yes the .78 is about a 420hp GT30 so not good at all,
Yes I have used these on a Evo try these http://www.full-race.com/ for housings,
The .82 has more lag than a 1.06 divided housing but you need a good split pulse manifold to make it work properly,
I would use a GT35 on a T4 flange with a 1.06 housing spools better than a GT30 on a open housing but you would need a trick spec engine to make it work on a cossie.

Mark

Norwegian Wolf

Okay, i see

The guy who is going to build my manifold is really good, so i think that wouldn't be a problem

How do you think a GT35 with that spec would work on my engine?
Specs above.. Do you need the camspec too?

Mark Shead

Most engines I have seen suffer from surge on a GT35 so one than spools even better would not be a good idea on most set ups, Unless your tuner knows his stuff,
But as you only wont 500hp a GT3076 on a 1.06 housing split pulse would make a awsome set up.

Mark

Norwegian Wolf

Okay
It's been done quite a lot of headwork on my engine..
What do you think takes to keep an GT35 away from surge on a engine like that?

Thanks for the advice!!!
Will check up more about the 1.06 split pulse housing then
What spool up do you think i can hope for with a turbo like that?

Mark Shead

I cant tell you whats the secretas its thatsecret,
You should have full boost in 4th under 4k with awsome transional boost responce.

Mark

Norwegian Wolf

Hehe, i see
That sounds awsome
More than i have expected :P

So that would be the best choice for my spec and bhp-expectations?

Mark Shead

As you are having a manifold made I would use a GT3076 with a 1.06 divided housing with a split pulse manifold going all the way up the wastgate outlet.
You should see a easy 500hp with awsome responce that would make a truly great car.

Mark

Norwegian Wolf

Allright, thanks m8!!

Norwegian Wolf

Mark Shead: Can i have your email adress?

Norwegian Wolf

1.06 exhaust housings is out of production untill 2010.

What do you think abouta .82 divided T4 housing from Precision?
With a divided manifold with T4 flange?

Mark Shead

I just this week brought a GT35 with 1.06 from www.full-race.com
You could ask them about the borg warner turbo's also.

Mark

Norwegian Wolf

I talked to Geoff at Full Race a while ago, and he said it wasnt able to get a hold of until 2010
So i don't know Said that Garrett had a hold up in the production..
Which BW turbo would work as well as a GT3076R with 1.06 divided?
S200sx twinscroll?

Mark Shead

Speak to Geoff about the BW, I may be testing a Big one soon

Mark

Norwegian Wolf

Ok, thanks Mark

J1mbo

iTrader: (1)

a good turbo is the gt30 as you say but using the .63 housing (un "split" )
as per paul ripleys on here it made 499bhp and very good response

Norwegian Wolf

But why not have the benefits of split pulse when i'm getting a manifold made anyway?
I have seen a few yb's with split pulse setups, and i like what i see
And im been recommended to try it from several engine builders..
Don't you think a split pulse setup will work better than a .63 setup?
Backpressure etc.?

Will probebly go for a manifold with 38mm runners.

A mate just dyno'd 770hp and 910nm with a manifold like that

J1mbo

iTrader: (1)

i dont think you'll see much difference on just 500hp tbh
but worth trying i guess your not exactly gonna lose

cossiemanden

If you can then i would also go the devided route m8
Otherwise the gt 3076 /.82 or 1.06 route as this have been testet to be VERY good

Twellsie

iTrader: (1)

T4

Norwegian Wolf

Okay
Well i don't know, just taking advices from the people that does hehe :P

Yes, i kind of want to try it