jamie956

Thinking about changing engine spec later in the year and want to get some ideas on what way to go, current spec is t34 .48, 55 blacks, 4x4 inlet, L8, dyno mapped. I like the power delivery of the T34 so would be looking for somthing with a simlar kick just a little bit bigger one.

So us your graphs and tell us your spec.

Caddyshack

Standard engine, borg warner efr 7064, 1000cc injectors (for later, maybe) and a vipec with coil on plug. The Turbo will do 530bhp.

Caddyshack

The efr turbos spool up MUCH faster and give more torque and more power.

mattman1234

tutuur

I have a brand new EFR 7064 for sale if you like...

As Caddyshack said, about the same spool as your t34 but 500+ capability

mattman1234

is that turbo pretty much a direct replacement for the t34,would you expect more power from with this and a remap ?.

tutuur

Not a direct replacement, find the threads on here, enough twin scroll efr's on Cossies these days.

Caddyshack

There isn't too much to change, manifold (essential) maybe a boost pipe, update the injectors and then remap.

You will need a 4 inch down pipe and suitable exhaust for that level of power. The inter cooler will need to be up to the job too but you could easily cap the power at 400 for now and add more boost later. My low boost map at 320 bhp still makes a very fast and easy to drive car.

tutuur

2wd manifold and downpipe probably, not a direct fit though

Pm me if interested, it's the .92 internal wastegated version

mattman1234

I'm definatly interested in this route.I'm kinda stumped with mine at the moment,i dont want to run a bigger turbo,ie t38,as it moves the power up the scale,also not sure on act's as i can't fit in a larger intercooler.
The only problem with the bg turbo for my car is the manifold,its very tight for space.Its a 4x4 manifold,you can't fit a 2wd in.

tutuur

Custom manifold then

mattman1234

What are the costs roughly

tutuur

Don't know about the rest really but i'll pm you my price

Mark Shead

You lost a 100hp on your low boost map

Mark

mattman1234

Would i loose what i gain on a 4x4 manifold,if that makes sense.
Just reading the gumph on their site and says has a t3 flange

tutuur

3" downpipe would be sufficient, 4" is 1000bhp+ capable....

No idea on your specific fitment

It's a t4 twin scroll .92 which you need

Harryh24

iTrader: (1)

here's my spec

200 block
6 long studs
Std std crank
Cosworth pistons .25
7.9:1 cr
Mahle shells
High pressure oil pump
Big wing sump
Wrc headgasket
Nick waples ported head
Double valve springs
16/14 cams
Vernier pulleys
Hart Inlet
2wd exhaust manifold
T38 billet compressor turbo
83lb Siemens

Caddyshack

Mark Shead made my manifold as space was tight in the 205 bay

Caddyshack

Oops you are right, it is 415 bhp and 420 lbft of torque on low boost.

Caddyshack

I am pretty sure that the manifold in 3inch was holding power back. A good manifold and exhaust fabricator can get around many problems, mine has a few small flats in it to get past bits n pieces and I have made a little more room since it was done to give a little more clearance by massaging bits of the car to suit

https://passionford.com/forum/restor...ng-gear-4.html
Here is a link to both graphs, low and high. You can see in the thread that Mrk thinks it will do 520 bhp and 535 ft lb with the engine rebuilt.

mattman1234

exhaust not a problem,it comes straight through the side of the car,its ,its just the exhaust manifild,i'll take a pic

mattman1234

Rod-Tarry

Have a bit of old school from the 1990's. Look at that torque 492ft-lb.
The fastest RWD Cossie in its day. Awesome car that Mr. Shead we were both young then well you were.

Staffi

iTrader: (1)

Was that T4 and 8 greens Spec Rodders??

Caddyshack

Mattman, it looks like the down pipe would need to be ovalled or notched around the chassis, just below the lambda, I am sure a 4 inch with a big flat would still flow more than a 3 inch.

tutuur

If you go into fluid dynamics it would show 3" is enough for about 550bhp, ofcourse bends would mess that up but 4" is way overspecced!

tutuur

@Mattman, looks like a tight space indeed

Rod-Tarry

We ran 700bhp on a 3" exhaust at Brunters.




Staffi- Yes T4 & 8 injectors.

tutuur

External wastegate i reckon?

Caddyshack

All I know is that Mark asked me to upgrade so I did.

Staffi

iTrader: (1)

@ Mark /Rod, who mapped the Sapph in those days Ahmed, or did you map Weber then Mark??

Mark Shead

Ahmed mapped it.

Mark

dissmalrs

My spec is standard apart from grpA head gasket t34- 55lb semans injectors close loop wasted spark

Marc sierra

iTrader: (1)

Why does Rod's engine on a T4 make more torque and especially earlier than the graph just above, which is on a T34?

ajamesc

That's the million dollar question lol that all comes down to the bits/spec and knowledge of the engine builder and mapper

Marc sierra

iTrader: (1)

But I guess a T34 should make torque much earlier than 4500/5000 rpm right?

costina

iTrader: (1)

Is that on a 0.63 housing? As if it was on a 0.48 the torque would be greater and a lower bhp figure.

Caddyshack

The one above does seem to make all of its power late in the Rev range, I bet it feels very boosty, is it laggy to drive?

dissmalrs

As far as I know it has a 63 housing it is running 32psi boost as well I think the turbo is at it limit

It's on standard 4x4 exhaust manifold and inlet

I was thinking of adding a plenum spacer but I have heard they make it a but mor laggy?

Rod-Tarry

That engine was very controversial at the time. 550 was where it was at & mine struggled to 500bhp really a 490 engine. It was a 450bhp Spec. engine with 42psi up its arse hence the incredible torque. I was the first of the MAD engine to use mega boost.
It was the fastest Sierra of its time proving that Torque is as or more important than Power. 183.3mph, 0-100 8.1 & 11.8 @127mph. My 840 engine is the same Torque not Power & the next one will be the same.
Mark has always said you strap this great big air pump to your engine best to use it.