cossie51

Looking at upgrades to my engine but don't want to pull it apart just to have long studs fitted as engine is only about 3k miles old.
My engine is a 200 block with .5 pocketed pistons. Mild port and polished head with BD15 inlet std exhaust cams. Hart plenum and top feed cooler. T34//63 turbo. New aftermarket management with 1050cc injectors.
Question is can I fit a EFR 7064 twin scroll plus manifold without issues of head lifting and causing problems as it's on standard head bolts ? Not looking to break any power records but would like a bit more power and torque until such time as money allows for a all singing & dancing bullet prove engine build

800bhp

can't see it being a problem just have it mapped on low boost.

Mad_Mat

Sure caddyshack will be along in a mo to comment but from what I recall his is a stock 200 block making 450 odd.

cossie51

What is classed as low boost on one of these ?

I see mark sheed didone on a standard car and it was set at 1.8 bar.

Mad_Mat

The thing is even at low boost <2bar it will be flowing more air than the t34 could. More air more fuel more power.

800bhp

I have low boost set at 1.5 bar that should be around 420ish. I'm sure Mark Shead said it could be set low than that when we out mapping.

Caddyshack

Mine was 400 bhp at around 1.5 to 1.8 iirc but I also ran 469 at 2.2 bar. It does have a metal head gasket though and when we took the rocker off the other day it looks to have arp studs but I don't think they do a lot over standard. Even on low boost the efr was a VAST improvement over my t34...less lag and 100 bhp more plus loads more torque low down.

cossie51

I also have a WRC multi layer steel head gasket and did have the ARP stud and nut kit but was advised to change back to standard bolts or strip the engine and long stud as was told the ARP studs have no give and will pull the treads out and crack the block.

So an EFR 7064 is all good on standard head bolts as long as you don't go mad with the boost as a big improvement over the current T34 I have ?

Next question is what's the best one to go for internal or external gated ?

Caddyshack

I had to go internal for packaging reasons but don't know what is best. The 7064 is like getting in to a car 20 years newer. Just make sure you have the right manifold and get someone like Mark Shead to check your exhaust is up to it as I think that can be a restriction around 400bhp.

cossynut2

I have had a new 200 block for a long time, no long studs , wire rung and group A head gasket, group A ported and polished head,T38 with billet comp wheel running 2.0bar boost,890cc Siemens injectors etc etc and approx 450bhp . So far had no problems with head gasket failure.
Can I ask why you have such big injectors? With the right bits/turbo etc they could give up to 500bhp. Are they Low impedence or high impedence with new management?

cossie51

Ok cheers for the heads up on the exhaust side of things. My car is fitted with a Magnex split system the same as the original exhaust was routed.

cossie51

Reason for injector size was down to future proving as the 1050cc injector dynamics injectors are very controllable and with the new management I can run them at my current spec and not need to change when upping power as was told they are good for up 700 bhp which I never intending to try and reach. They are high impedance.

Apart from long studs all the bits on my engine are spect to allow me to run 500 bhp.

Caddyshack

Mark fitted 1000cc injectors to mine too to future proof it. I also went coil on plug but that was to modernise it.

cossie4i+

iTrader: (15)

I used to run 2.3bar with standard head bolts.


Steve

cossie51

My engine will end up getting a rebuild at some point but I just didn't want the expense of it just so I can have it long studded to run a bigger turbo.
Looks like a manifold and efr 7064 is the way to go but now need to find out if it would be better to go internal or external wastegate as don't want the expense of a second manifold later on just to change it.
Pros and con of internal and external on these turbos ?

Caddyshack

Internal works well on mine but Mark prefers the external I believe but cannot remember why, he can sell you the turbo, manifold and explain why you need the spec you need etc. give Mark Shead a call 07768 356204

20/20 vision

a second vote for coil on plug (+ denso iridium plugs) - a significant upgrade and cheaper than a new set of plug leads!

as you're fitting after market management you can bin the ancient cosworth plug leads, amplifiers etc and directly drive Toyota COP's.

Caddyshack

Agreed, AND you can even go over to cam trigger and delete the ancient distributor from the engine bay (I know there is nothing wrong from taking the trigger from the hall on the dizzy but to me it just looks soooo old fashioned)

20/20 vision

or not bother with cam trigger either and run them in parallel with wasted spark

20/20 vision

oops forgot the sequential requirement for the injectors - keep the 2nd trigger input!

cossie51

I was already on a coil pack as I have removed my pectel T2 but new management has coil on plug and runs the Honda h20 coils.

turbotrev

I’m pretty sure it’s the internally gated version he prefers as the externally gated one comes with a bigger exhaust housing giving a touch more lag

Cheers Paul

cossie51

So which is better with these EFR turbos, internal or external gate and why. I know which I would go for on a normal turbo but not to clued up on spec and what works best for the EFR range.

Also I see quit a few Evo,s running external gate but with 2 wastegates but only seem to see 1 on the cossie manifolds.
Is there a reason for this ?

turbotrev

Mark Shead is your man to ask for what’s best for your application, he is the efr guru

Cheers Paul