GT2554R Turbo - Map Opinions
Turbo Mini Forums

Hi all,

This turbo looks like it might be ok me?

Any comments as im not too hot on maps

Chris

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I think it would be brilliant on a big bore 16v motor, but 5port its too big in my eyes.
Nice though rollerbearing turbo and about £750 brand new i dont think is bad.

Rick

998 16v I think might be to big for you.

http://photobucket.com/quintonrose

If this is for the 970 K head engine, then it is a little on the large side.

Peak power would be OK, but not as good as a GT17 or GT20 because of the poor efficiency.

Also it has a 0.64 A/R turbine that would take a lot of flow to spool it up to full boost. The roller bearing core may offset that a bit.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Look at a GT2259

Will flow enough for your 200bhp target. You wont have to go stupidly high on the revs to achieve it either. 9000rpm should be sufficient.

Between 14-17 Psi should get you somewhere near your target.

If you feel the need for more power wind the boost up to 22-24psi.

250bhp should be attainable from the calculations using some "estimated" numbers. But what happens in a real world situation of course may be significantly different.

Yer for the 970 K motor.

Just like the fact it was roller bearing and water-cooled.

I think im still leaning towards the GT20.

I will be running antilag, so should be ok to spool up? Does that change your thoughts on this one paul?

Chris

A 2056 in your application will spool from around. 3250rpm with full boost attained from 4000rpm. Looking at about 18-19psi.

250 is attainable with that turbo. But you will need to stop is spooling till around 4000rpm.

Comparing the plots on the maps for the 2056 and the 2259.

I think you could let the 2259 spool from a little earlier. But the 2056 is better for higher pressure ratios.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

25 centre on a 2056 or a 2259 would be emence if you could do it.

Drives
-Ford S-max Mk2 Ecoboost
-Rover 100 VVC #2 - track project

Searching is all you need on TurboMinis

Initial spool time will be irrelivent as I can build boost on the line and use the launch control.

Then the antilag will keep the boost up between gear changes and round corners :)

I do a total of about 50 miles racing thw whole year so not going to worry about turbine :)

Chris

How are you going to build boost on the line? You need load to make boost. You don't get that standing still.

launch control with als.

How does launch control make load?

Sit and rev a turbo charged engine in neutral. see how much boost you make. none. The engine needs load.

The only way we found to make boost when we first put the engine in the van was to sit it on axle stands, drop it in 4th then build up the rev's. Then you keep the rev's on and dab the brakes creating load and as a biproduct boost.

All this anti lag etc is no substitute for picking an appropriate turbo in the first place. The 2554 is too large in my opinion.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Thanks Tom, thats what I wanted to know really.

So i'm back to the GT20 then?

apbellamy? - How do rally cars build boost on the line?

I've never built a rally car so I can't comment.

Reading the link above, it only mentions gear change though not setting off. You still need load to make boost and you can't do that with the car staitionary.

Actually Andy you can to a degree by holding the car back on the brakes and slipping the clutch to load the engine and build some boost. I used to do this to good effect in my old 306 diesel turbo for emergency starts off the traffic lights. However its harsh on the clutch and also loads the transmission right up by the engine making a lot of torque from low revs.

Going off topic here, but the MS3 has a feature that allows you to add extra fuel whilst retarding the ignition with launch control. This spools up the turbo and creates boost without load :)

http://www.msextra.com/doc/ms3/launch.html

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Paul, thats exactly what I will be using.

But via DTA ecu.

Team Racing

I dont really, was more the ball bearing... but water cooled can only help :)

Jimbo's turbo seems to work well and I believe his is a ball bearing core with a striking resemblence to the GT2056

If something is worth doing, it's worth doing half of.