Reply With QuoteCruise with a 300Tdi at 2000 rpm will need a good tail wind!
ForumSage
Calculated results for a 300tdi with stock turbo, better turbo and supercharger here: supercharged 300tdi ?
Results in a nutshell (same fuelling for each).
Max power.
Stock 82kw at 4000rpm.
Better turbo 88kw at 4000rpm.
Supercharger 76kw at 4000rpm.
Max torque.
Stock turbo requires 3.4kw drive pressure.
Supercharger requires ~7kw of power from the crank.
Engine is only producing 55kw max at 2000rpm.
Fuel economy.
At 2000rpm cruise that supercharger is still drawing ~7kw from the crank. Which does bad things to fuel economy.
Fossicker
Cruise with a 300Tdi at 2000 rpm will need a good tail wind!
ForumSage
Stock 300tdi RRC/Disco that's about 80km/h isn't it?Originally Posted by lr110qld
Grandad cruise.
Wizard
Supporter
This is all getting a bit off topic now. Jose was letting us know about his new turbo set up and now the whole thread has gone to ****. I don't care about the 300 Tdi and there power and what it can make. This is for the td5 and what he may be offering to us in the future. This place has really gone downhill lately.
ForumSage
SubscriberWhat has heat got to do with it? I always thought that a turbo was driven by exhaust gas pressure which just happens to be hot.
Dave.
I was asked " Is it ignorance or apathy?" I replied "I don't know and I don't care."
1983 RR gone (wish I kept it)
1996 TDI ES.
2003 TD5 HSE
1987 Isuzu County
ForumSage
The 300tdi and Td5 are both 2.5L diesels with 2 valves per cylinder. The example is 100% relevant.This is all getting a bit off topic now. Jose was letting us know about his new turbo set up and now the whole thread has gone to ****. I don't care about the 300 Tdi and there power and what it can make. This is for the td5 and what he may be offering to us in the future. This place has really gone downhill lately.
ForumSage
It is heat that drives the turbine. The heat also creates the exhaust gas pressure and extra volume to spin the turbine. It's easy to see this on diesels, put your foot down, the exhaust gets hotter and the turbine spins harder.
The hotter you make the exhaust gas, the better a turbine performs. This is how and why overfuel is used by many tuners to make the turbo spin up sooner.
Fossicker
This pic has 2 equations for turbines, 1st is power developed by the turbine, the 2nd turbine efficiency.
nt is turbine efficiency
mt is mass flow of exh gas
cp is average specific heat at constant pressure of the exh gas
T3 is absolute temperature of the exh gas entering the turbine
T4 is abs temp of exh gas exiting the turbine
k is ratio of specific heats
PR is ratio of inlet to outlet pressure
Last edited by lr110qld; 10th November 2014 at 04:32 PM. Reason: Fixed mistake in 3rd last line where I had typed T3 instead of T4
Master
Hello all,
Lets get back to basics...again
We started this thread saying that we are gona try a few solutions from the standart turbo, and we have presented the first unit with some of those solutions...
This is what we have made and this post its to let you know how are things at this point.
Our original idea work very good. I've been running the turbo in my car and it drives really good. At a certain point of this development process CRTurbos suggested that we should also use a (MFS) Compressor wheel.
Dyno figures very soon...
Regards,
Master
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