Caddyshack

That looks like a stonking motor

Mark Shead

E85?

Mark

jontysafe

I'm perhaps not the best exponent of the GT series as I'm going efr. As far as I can see no one has tried the EFR7163 mixed flow turbine yet so that's the way I'm going.

I have to say though I loved the way my car drove on the gt3076.

Jay,

iTrader: (4)

what power will the 7163 do ?

Mark Shead

Quoted at about 580hp.

Mark

Jay,

iTrader: (4)

Have you stuck one on a you bastard yet ?

jontysafe

I have been brought up not to discuss money/cost but think it might add something to the post.

So far:
Efr7163 int gate t4 £1100 (sold my GT30 for £600
100mm 2nd hand Airtec intercooler £100
Motec m400 inc can to USB cable, 512k data logging and lambda £1000 sold my L8 for £300
I think whatever way you skin the pudding the manifold is circa £800-£900
I have no doubt that a new loom will leave little change from £500
1000cc injectors circa £400 (sold my Siemens inj and chip for £300)
Mapping I don't know yet

Mark Shead

Not yet, I like the 7064 and 7670 so not found the need to use one.

Mark

jontysafe

Reasons I chose it is I'm bloody space restricted and it runs the smaller B1 frame. I have a sneaking suspicion it could turn out to be the best suited turbo for the YB at circa 500bhp.
Saying that I don't plan to push mine much past 1.8-1.9 bar because Westfields are a pain in the arse

Jay,

iTrader: (4)

Have you tried the states for injectors i got mine dirt cheap ?

Ok well seeing as the 7064 will do what i need but i just thought i would ask lol

turbotrev

That isn't the case for me at the moment mate, I'm happy with my gt30 for now so will stick with that setup for the time being I think.
My mind may change once I see more/go out in/drive an efr equipped car but time will tell

Cheers Paul

Rod-Tarry

That's fine if you are happy why change.

turbotrev

Just looking to the future and keeping my mind open...
At this precise time I am good.
Until I drive an efr equipped car I guess!! Lol

Cheers Paul

jontysafe

jay can you let me have the details on Injectors?

3doorcozmess

Hello crazy

Any news for us

Cheers si

R4N SS

iTrader: (6)

Jay pm me details of injectors also - still a long way off buying them but may as well start researching now

ajamesc

Talking of injectors lol I've a set of low imp rc 1000cc I no longer need! Just need to get them checked out. I have to up grade to 1300cc

crazycage

Been really busy , only started the manifold last night

Stu @ M Developments

iTrader: (12)

The best example I can show is one from this week as its directly comparable for two reasons.

1) We mapped it both times.
2) NOTHING else was changed.

The car (A Sierra Cosworth -781, stdhead-16/14) originally had a GT3071 and while it went well and made over 500bhp, the owner wasnt happen with its responce times.
He went away and eventually changed to one of Marks awesome manifolds and the EFR7064 and brought it back for mapping again.

The torque and boost curves tell the story just fine.
Yes, the GT went on to make more power, but its response was rubbish (In comparison) and the owner was specifically NOT chasing figures.
He wanted responsiveness and driveability above all else. We chose to run this turbo nice and easy at just 28psi falling to 25 at top end, where as the GT3071 was running 34psi peak.



Ive added a bit of data to the graph to make it a bit more understandable where the gains are.

Dyno graphs dont tell the whole story and cant graph responsiveness to throttle input but rest assured, this is just an absolutely awesome turbo & manifold combo... my favourite YB turbo by far now thanks to all Mr Sheads development with them.

LHD220Turbo

iTrader: (4)

465ftlb as opposed to 235ftlb @ 4200rpm tells me all i need to know with regards to how much better it must have drove

bet the owner was chuffed!?

jontysafe

Fantastic! I wonder how many gearboxes they are going to break! I wonder how my t5 will cope?
That 3071 spooled very blooming late.
What gearbox is that car on?

stevieturbo

I'd love to know why all these GT30's seem like laggy bastards !

They just seem unbelievably bad, and far far worse than any GT30 I've used on a 2.0 Subaru

CossieRich

iTrader: (1)

I must say the graphs do make the GT30's appear more laggy than they actually are on the road. My graphs on page 3 clearly show 2 bar at 4200 rpm. In reality in 4th gear on the road it was over 2 bar before 4000. No idea why it seems so different on the rollers.

Mark Shead

Glad you got chance to drive it as it's hard for most to understand the diff that turbo set up makes.
The 7064 is awesome and suits the yb really well.

Mark

Caddyshack

The other 4x4 pug like mine is H20 COS, this had a 500bhp MAD engine on the old GT30 and the owner said mine would be MUCH quicker on the road due to how laggy his engine was, he said his 300bhp 205 would have seen it off in most instances until right up in the rev range.

Rod-Tarry

Well shown Stu.

turbotrev

Stu what management was that car on?
Same for each turbo?

Cheers Paul

Stu @ M Developments

iTrader: (12)

Yes. L8.

turbotrev

Cool thanks.
And that was mapped by you guys?

Cheers Paul

Mark Shead

Out of interest did the map need much work on the change of turbo.

Mark

turbotrev

Do you guys not recommend fitting aftermarket management with the efr conversions?

Cheers Paul

3doorcozmess

Hi Stu

you ran the EFR at 28psi would there of been a lot of difference if you had ran the EFR at the same boost as the GT

Stu @ M Developments

iTrader: (12)

Yes, lots of changes low down as ive never seen a YB with that much airflow below 4500rpm before... its hammering well into load sites a GT30 will never access, its much more like a T34.48 map below 4500rpm in all honesty... just more of it in a great big ramp. Love that turbo, great work mate.

Stu @ M Developments

iTrader: (12)

If people have the budget to change then it frees them up for work with other tuners nearer home if need be and its more cost effective if your going to be messing with it a lot and need lots of mapping sessions.

However, the L8 and P8 are fine as long as you dont want to run hugely over 2bar of boost (Thats all it can see without rescaling to bigger and hurting low end resolution) as the ecu couldnt care less what turbo is fitted up to 2 bar. Its speed density, it just does as its told to do, inject fuel and create spark lead at any given RPM/Load site and interpolates both vertically and horizontally between them.

All (All ?) other ECU's offer is warranty, easier mapping, more refined load and speed sites (Especially in the spark/load area to be fair) and the ability to take them with you easily from car to car, but they arent a necessity.
However - aftermarket ECU's can also offer decent features like different boost curves and limits per gear, but then so can a decent boost controller... The L8/P8 is still a capable old thing for an antique... but then so is the YB and that old tractor engine is even less advanced than its antiquated ECU. LOL. Sadly, nothing yet compares to modern O.E stuff with 12'000+ calibration tables, but maybe one day.

Hard to say, but it looked like it had more to give. Charge temps were fine so it wasnt running out of its efficiency flow.

That said, it is what it is now, its gone and the owners a happy man for now, so any answer I give on that particular car and hardware combo is a guess, and you can make your own guesses without me sticking my neck out. LOL

Rod-Tarry

Mark has been saying that for 5 years but of course why believe him he is of course trying to sell Turbo's on this site. Of course your not Stu so they believe you makes me Chuckle.

SiZT

How come the cross over point isn't at 5252 on the EFR Stu?

Edit: Never mind, just realised it's torque against MAP

Stu @ M Developments

iTrader: (12)

Nature of the beast mate. We dont sell turbos and everyone knows that so I have no axe to grind either way. I earn £250 for a live map on the dyno whether its got a T3 on it or an EFR and I dont care where the customer bought it so it makes absolutely no odds to me.

Credit where its due - great turbo and manifold. Best ive ever seen for a YB.

Mark Shead

Thanks for your comments I appreciate them from someone I trust and respect.

Mark

Mark Shead

It called being ahead of the curve some will belive some wont and other will just say its bs and this is tuners I am talking about,
For me its making the programable Ecu much more common on road cars going back to 01, Running twin scroll manifolds your first stroker engine had one but we didnt have the turbo's avl and this was prob narrow minded Garret is the only turbo to use,
The Top feed intercooler was my idea for the YB in the UK made to my wish to feed in the top with shorter cores, Now who doesnt make a top feed one,
EFR turbo and manifolds now you will see common place,
Now I will stop patting myself on my back.

Mark

Mark Shead

Ohh yes these turbo's love some boost.

Mark