AAN into Ur quattro, 400-450 Bhp Target

[DJones]

Interestingly enough my car with the MD357 spools to early making it to aggressive.

I have ordered from CR turbos (Craig, who was very involved with the MD357 design, back in the day, as its quite an old turbo by today's standards) a Porsche derived .82 hot side.

It will be interesting to see how it works, can always swap it back if its not what I'm after...

Darren.

PS. the hot side on a standard MD357 is a K24 CNC'd to accept a larger wheel.

[prj]

Interestingly enough my car with the MD357 spools to early making it to aggressive.

That's more because you don't have TPS based boost control, rather than due to the turbo...
So you get full boost on part throttle all the time and the car is annoying to drive.

[DJones]

That's more because you don't have TPS based boost control, rather than due to the turbo...
So you get full boost on part throttle all the time and the car is annoying to drive.

True, but it is still a very aggressive turbo, i think the hot side is .6 i.e. not even .63

My set up is with standard AAN spring with the least amount of boost ramp my eboost controller will allow, i.e. immediate waste gate creep. I could run a 3 port N75 but it currently runs a 4 port which I'm told are a bit more aggressive is use.

Still be interesting to see what the .82 hot side feels like..

[URquattroGus]

Darren

Interesting.... The more I think about this the more my head spins. Could be quite a lot of hassle to change things and then I could still not be happy.

The machined K24 Hotside of the MD357 explains quite a lot to me, smaller housing so potentially faster spool. Yet this turbo can supposedly do upto 32 PSI according to the word file you posted a while ago.

Darren- did you ever manage to get yours on the dyno with this turbo, what does the power curve look like?

[Bram]

do you still run the dual mass FW?

[URquattroGus]

The car has a single mass alu flywheel of 12lbs from 034 Motorsport.

[Bram]

with this result on an EVO RS2 EM from Wagner I will not shift towards the Wagner SQ EM so easily. impressive results mister

I just wondered since the new turbo wheels deliver better results. Does the new compressor wheel on the turbo create a different sound than the older design wheel?

[Jamo]

Don't forget JP just made 572 on the rs2 evo manifold

[URquattroGus]

Whats to stop me fitting a borg warner EFR 7064 or something like that from the EFR range?

Are they not compatible, what with all of the built in wastegate and solenoids etc?

[Jamo]

They look great i've been warned off them because they've had issues with broken shafts the biggest issue is the size of the hotside probably wont fit in stock location but I never got that far

The interal wastegates are quite big 40mm afaik

[URquattroGus]

or this;

Maybe stil with 0.63 AR

http://www.034motorsport.com/turbochargers-and-accessories-precision-turbos-precision-cea-5557-turbo-billet-compressor-wheel-p-20077.html

Some big claims made there.

Or maybe a garret GTX28 series?

Maybe I should just chill out, shut up and enjoy the car! I am, but it's just so close to it being how I want it! I think more low down torque and maybe a more progressive power is the answer.

[Jamo]

Can't comment, precision are really popular in USA, there's a forum member with that turbo for sale in the UK in the for sale threads

[URquattroGus]

Right. i've decided what I'm going to do.

I'm going to bolt on a machined K26 housing that costs approx £300. Hopefully this will give me better spool and more low down torque. It's effectively going to be the same or very similar to a MD357....

This means I'm going to have to change my exhaust manifold!

The Wagner RS2 EVO with T3 Flange I have now is barely used, only had it on for about 2500 miles from new.

So if anyone wants to swap for a K26 version or has a K26 version for sale I may be interested!

[Acidburn]

interesting, I actually traded my k26 one for a t3 with andy casey/rusty.

[URquattroGus]

I've been reading up on a few things and trying to understand compressor maps;

This GTX2867R looks potentially quite exciting having tried to plot a few points on it and comparing to current GT3071R, and also looking at GT2871R and GT2876R.



What do you think? Tempted to give it a go and sell the existing turbo.

I am looking for improved spool up, better mid range and similar power.

Took the car for a drive again on christmas eve, it feels like I have nothing until 3800rpm or maybe even 4000rpm, and then all hell lets loose. To me this means I only have a usuable 3000rpm or so which I am not really finiding to my liking.