AAN into Ur quattro, 400-450 Bhp Target

[macspring]

All,

Great thread, especially the info being discussed on the turbos.

While I don't want to ruin the thread, I still think this question for DJ will be useful for others, as well as myself, to have included here, and it is regarding the different mechanism Jamo referred to on your Ur that makes your turbo boost very early and hard, can explain how it differs from the standard mapped system on an ABY ?

Thanks.

[DJones]

Mine had a leak from one of the bolts that clamps the hot side housing to the main body, it hadn't come out producing a clear hole but had backed out enough to hear what i thought was a cracked manifold.

Interestingly enough mine became more "on off" when in this state, became more progressive once i had located it and tightened it back up.

What i am getting at is the smallest of leak can cause some significant side effects. I couldn't find my problem with the normal air test i had to smoke test it.

Other than that perhaps you need a little more off boost advance.

A wild card but check your cam timing to.

[prj]

From dyno graph 3500 rpm full boost is exactly what a 0.63 3071 does.
If it's too "laggy" for you, go 2.7 biturbo, also I don't know what cams you are running, but if you are not running stock cams, try fitting them.

[URquattroGus]

Angus

I am in no way a turbo expert, but your slow spool doesn't sound right for a GT3071. In truth its not that much different to a MD357 yet you get a boost ramp coming in circa 2000 revs later than mine on a similar set up.

I have been advised that the GT3076 comes in sooner than you are indicating for your GT3071.

It might be worth checking your set up before you part with any money.

I have not driven a car with a GT3071 so cant be sure how it performs but it doesn't sound right.

If you talk to Craig at CR Turbo's he will be able to provide you with a wealth of experiance and knowledge.

He used to be at Turbo Dynamics and recently (within the last 12 months) went to CR. (I must say i think TD has gone down hill since, there just seems no experiance to hand) when i last spoke to him I mentioned that TD could no longer supply the MD357 he said he could spec one the same no problem.

He also said the MD357 was built solely to be a torque monster with street drivability the aim. As you said in earlier posts it may suit your needs but i would start looking at your own set up first as something doesn't sound right to me.

Hope it helps

Darren.

Thanks, yes, I am a bit dissapointed with how it's turned out to be honest. All the figures I wanted have been achieved, but it just doesnt feel right.

I actually spoke to craig at CR and he said put the KKK hotside on and I would get arm braking torque. However, if my current housing is 0.63 and the KKK is 0.6 or similar, I fail to see what difference this would make apart from the slightly smaller a/r ratio?

Also, I'm reluctant to go back from the T3 flange manifold as it's more versatile and supposedly flows better.

However, looking at the specs of the MD357 it is quite different to the GT3071R on the compressor side;

MD357

GT3071R

Compressor cold side

0.5 AR Housing

0.5 AR Housing

48 Trim

56 Trim

52.8mm Inducer

53.1 mm Inducer

76.2mm Exducer

71 mm Exducer

Hot side

0.6 A/R KKK Housing

0.63 Garett T3 housing

84 Trim

84 Trim

55 Inducer Diameter

55 Inducer Diameter

60mm Exducer Diameter.

60mm Exducer Diameter.

So essentially the Hot side is the same apart from the housing.

The Compresor is quite different, it actually matches the spec of the GT2876R compressor, hence I was looking at that turbo. The Gt28 has a smaller exhaust gas turbine so might spool better, but looks to still be able to flow for 450bhp?

Not many people have used the GT2876R and I was wondering why not.

Anyway, you are right darren, I ought to check my setup before I spend £££


What can I check though? Maybe my intercoolers and inlet tract are not up to scratch?

With the wagner inlet and 3" piping between all intercoolers it's pretty similar to yours.

Maybe I should do a leak test again, pretty sure this is fine as I tested it all not long ago and fitted all new JCS clips.

[DJones]

Angus

I am in no way a turbo expert, but your slow spool doesn't sound right for a GT3071. In truth its not that much different to a MD357 yet you get a boost ramp coming in circa 2000 revs later than mine on a similar set up.

I have been advised that the GT3076 comes in sooner than you are indicating for your GT3071.

It might be worth checking your set up before you part with any money.

I have not driven a car with a GT3071 so cant be sure how it performs but it doesn't sound right.

If you talk to Craig at CR Turbo's he will be able to provide you with a wealth of experiance and knowledge.

He used to be at Turbo Dynamics and recently (within the last 12 months) went to CR. (I must say i think TD has gone down hill since, there just seems no experiance to hand) when i last spoke to him I mentioned that TD could no longer supply the MD357 he said he could spec one the same no problem.

He also said the MD357 was built solely to be a torque monster with street drivability the aim. As you said in earlier posts it may suit your needs but i would start looking at your own set up first as something doesn't sound right to me.

Hope it helps

Darren.

[Costash]

Your answer is k26/27 hybrid from Hoffer, is what I can tell you for sure.The difrence on spool from my previous sms hybrid and k26/27 hybrid it is around 400rpm instead of 2500 is 2900 and a lot of torque.I am very pleased with my curent setup it is just perfect and adding water metanol injection it is gonna be the best setup for a road use you can have,list it is what I am gonna go for, no regrets!

[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.

[Acidburn]

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

[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!

[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]

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]

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]

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]

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

[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?