Turbo Upgrades for the GUIV TD42Ti

[Winnie]

Yeah, this is how I read it first (blue current tune with reduced AFR/richer mix).

My understanding: lower the AFR is richer the mix (more fuel)) means smoke and engine heat. Not enough fuel (a high AFR) means clean running and lower engine temperatures.

Shit I actually got that wrong, blue is pre tune and black is post tune. So your theory is correct.

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[Bidja]

Shit I actually got that wrong, blue is pre tune and black is post tune. So your theory is correct.

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OK, ring Andy and ask which trace is current. I do think it is blue. More fuel does not necessarily mean more smoke under load, is also depends on overall tune.

If you look at your blue trace eng produces more kW / N-m and a reduced AFR (increased fuel) and fairly level. Love the result only if my CRD could a achieve this torque behavior.
Same trend (blue trace) in both your graph and Mark's tune result. Different outputs but same trend.

By the way rule of thumb:

It is best said that a diesel begins to smoke when the AFR gets below 15-14:1 for a non-turbo and 16-15:1 for a turbo-diesel.

[Winnie]

OK, ring Andy and ask which trace is current. I do think it is blue. More fuel does not necessarily mean more smoke under load, is also depends on overall tune.

If you look at your blue trace eng produces more kW / N-m and a reduced AFR (increased fuel) and fairly level. Love the result only if my CRD could a achieve this torque behavior.
Same trend (blue trace) in both your graph and Mark's tune result. Different outputs but same trend.

By the way rule of thumb:

The black line on my chart is 100% the after tune.

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[Bidja]

The black line on my chart is 100% the after tune.

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OK then so, AFR higher and leaner.

[Cremulator]

The black line on my chart is 100% the after tune.

Yep, you can see there is a key with a black dot on the left for 'after adjustments' and a blue dot below for 'compare run: drive in'

[mudski]

Yeah I went in at 180rwkw and came out at 160. Less power but it runs good and no more puffing billy. I wont be changing out the turbo anytime soon. I'm done with it. Just pouring money into this thing lately and continuously chasing my tail with the cooling system. When the funds allow, I will be getting rid of the GU and buying something else.

[Bidja]

Driveability is what counts.

Guess he decided to run a bit leaner for eng reliability. Yes, a rich mix apart from causing emission issues, can make eng run hotter and be to the detriment of engine longer life.

Have read that after market turbo diesel run best around 19-20 AFR or higher under full load and a factory turbocharged diesel of about 20-22:1 or higher under load. Not to say that you cannot run a richer mix many do.

My CRD procharge stage 3 h/f turbo, runs Max boost 26psi and 19:1 AFR. Came down to 19:1 AFR from 21:1 for more fuel low down to achieve improved early boost (getting there now the need to further improve induction).

[mudski]

Driveability is what counts.

Guess he decided to run a bit leaner for eng reliability. Yes, a rich mix apart from causing emission issues, can make eng run hotter and be to the detriment of engine longer life.

Have read that after market turbo diesel run best around 19-20 AFR or higher under full load and a factory turbocharged diesel of about 20-22:1 or higher under load. Not to say that you cannot run a richer mix many do.

My CRD procharge stage 3 h/f turbo, runs Max boost 26psi and 19:1 AFR. Came down to 19:1 AFR from 21:1 for more fuel low down to achieve improved early boost (getting there now the need to further improve induction).

I told Andy at Diesel tec to back it off, as i wanted driveability pretty much. Engine was still running hot though after the tune. But a crap load less smoke. I haven't had the chance to take it for a good run yet to see the real benefits of the new tune and all the new work I have done tot he cooling system.

[Rossco]

What sort of temps you seeing and under what conditions?

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[mudski]

What sort of temps you seeing and under what conditions?

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Just normal road driving Rossco its around 10c higher than usual. There a long'ish uphill run On the Research-Warrandyte rd mate heading north bound and not even flogging it it will see 95c without an issue on a 15c day. Any sort of load and the temps get up there real quick. Its never been like this. On the up side. The better fan and the oiled up hub does get the temps down a bit faster. I need to get it on the highway and see how it fares now.