Xud11 boost help

[Cbray2003]

Hi there all I'm just wondering what is a safe pressure to be running in and xud 11 on stock internals as  this is my first time with the 2.1 lump and don't k ow to weaknesses etc thanks 

[Mattcheese31]

Ask piggy or dum dum but afaik internals should be fine on a stock blower

[Cbray2003]

It's a gearbox mounted td04L running 24psi atm I know it will take more but not shore how much more 

[Piggy]

step1: rip that CRAPPY turbo off that engine. Its a rubbish turbo for the purpose and even worse for the 2.1 that doesnt like to rev.

step2: chuck that crappy old turbo in the bin.

step3: fit a modern turbo.

step4: run 28psi of boost, make over 220bhp and 350ft lbs of torque and then start finding a clutch to accept all that power

[Niall]

Calculation for working out safe XUD11 boost:

Boost piggy runs - 5psi = safe boost

Or,

Boost piggy runs + big stock of replacement head bolts = pushing your luck

[Dum-Dum]

I had no issues up to 25psi and ran most of the time just above 20psi from about 2000-5000rpm

Boost is just half the issue, its flow you want to worry about, a big turbo will often flow more air at the same psi than a little one on these engines as it removes alot of the restriction.

I agree with piggy, these engines aren't exactly rev happy, you may find it goes alot better with a modern turbo. Piggys figures speak for themselves about the strength of these engines and I'm sure mine would of got there power wise without issue as at about 200bhp it felt remarkably untroubled

[Piggy]

Hahahaha. Love you dumdum for assuming yours had 200bhp

Aye you will start lifting the head with a better flowing turbo to be honest. But fitting ARPs is SO worth it!

Also a GTB at 25psi and you can cool ya drink on the inlet...I bet a td04 you'll find its toasty!

[Cbray2003]

Ok thanks so what turbo would u recommend for the job thanks 

[Piggy]

If only someone donated a fiver to the forum everytime that question was asked on this forum!!

Whats your budget, skill and target/goal?

[Dum-Dum]

Hahahaha. Love you dumdum for assuming yours had 200bhp

Dyno'd at over 180bhp mate in it's new home making about 60lb/ft less and bringing the boost in about 1000rpm later. With the torque curve I estimate it had 200bhp was bloody close.

Ok thanks so what turbo would u recommend for the job thanks 

As piggy says that depends

If you are on a real budget a GT2056
If your not so budgeted a GT2060
If you can work out how to mechanically control a VNT then a GT2359V like I had off a merc 320cdi
If you can work out how to electronically control a VNT then one of the really modern ones a GT2260V off one of the new BMWs

If you really want a talking point then the twin turbo set up off one of the modern BMW or Merc diesels would be incredible.

[Cbray2003]

Ok well budget is pritty flexible and aiming for 200bhp mark and I'd be happy there for time being and I I'm pritty well brained when building engines and things so give what ever a pritty gd go and like the sound of the twin turbo could be an idea 

[Piggy]

GTB2056vlk.

Job jobbed.

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@dumdum when did you Dyno the 2.1?!?!

[Dum-Dum]

@dumdum when did you Dyno the 2.1?!?!

I never did, the new owner did, I'll see if I can dig out a link.

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I was bringing in the boost (and thus the power) a whole lot earlier (like 1000-1500rpm earlier but the important figure is I was slipping a nearly new valeo clutch and thats 280lb/ft and it was a good way up the rev range. Even if you say it was only 260lb/ft, a perfectly reasonable figure to be making on this engine with a VNT that size 260lb/ft at 4k is a nats whisker off 200bhp


The graph it ATW figures, ATF is at the bottom.
[attachment=20583]

[Piggy]

Is that a king edward you used to take that pic!?

Didnt realise you were running an11mm

[Dum-Dum]

Didnt realise you were running an11mm

It wasn't

But then we all know you don't need an 11mm to make 200bhp and it was smoking on the dyno but i was running her clean.

[Piggy]

Indeed not on the xud9 but we all know how extensively modded that pump was... I am suspicous of being able to supply a higher capacity engine with enough fuel for 200bhp from a 9mm.