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i'm after a little help in regards to setting up a twin turbo.....the current turbo, not held back (had mine at about 12.5psi) standard is about 10.5psi.... can you use the exhaust from one turbo to run another one? same as the air flow from one, through the second.... i want to run about 16/18psi of boost.. yeah i know it damages the bottom end.... i'll worry about that when it happens I'll be running LPG through it, as well as having the injector pump re-tuned again.... estimated output is around 130kw.... 110 is achievable without LPG on 12 pounds of boost..... i realise one turbo would be sufficient....... but hey, it's my mid-life crisis and i'm enjoying throwing an endless amount of cash at my vehicle...... currently purchasing an auto out of an MU to run behind it as well.
sensible answers please...... i don't want to put a V8 in it.................. yet
There is no "I" in Team, but there are 5 in Individual Brilliance
Yes it is possible, the cash thing does become involved.
Seriously though, it called series turbocharging. Both turbos need to be matched correctly. Something which not too many turbo experts know how to do.
There is a diesel dragster that runs series turbos, does 7.98 1/4 mile runs.
This may not be for the faint hearted, why not find a turbo that will go higher in boost pressure. Most will go to 20 psi without too many problems.
I agree with Dzltec. One turbo can easily produce that sort of boost without a problem, without the complexity of twin turbos. Combined with lpg injection and a good intercooler you should easily produce the output you are looking for.
What engine do you have - 4JB1T? Will be interested to hear how it holds up.
i have a turbo for it that will probably run 20psi.... it's one of a set of 2 off a Supra i think...... one turbo is rooted.. the other is fine..... the thing i liked about it (the old setup) was it had next to no lag at all from idle all the way up to about 3,500rpm where it ran out of puff.... but using the torque properly and it hauled pretty good for a 2.8 with mechanical injection. I was already going to remanufacture the exhaust manifold to a high flow type... i figured since i decided to spend more money on turbos i don't really need, i'd try to series turbo charge it...... could be interesting with LPG.
In what way do they have to be matched?
There is no "I" in Team, but there are 5 in Individual Brilliance
ISUZUROVER wrote:I agree with Dzltec. One turbo can easily produce that sort of boost without a problem, without the complexity of twin turbos. Combined with lpg injection and a good intercooler you should easily produce the output you are looking for.
What engine do you have - 4JB1T? Will be interested to hear how it holds up.
yeah it's a 4JB1T...... i'm told by mechanics that 16psi should be sustainable on the bottom end of those engines...... the only problem i have with bigger turbos is the lag you suffer....... although with an auto it should be easier to keep it up on the revs.... but since i have the turbos here.. i might as well play with them..... i have time, and i have the resources to make whatever i need to fit them. And besides..... it hasn't been done before....... so it's original
ultimately i may just ditch the turbos i just paid $200 for and use the OE turbo
There is no "I" in Team, but there are 5 in Individual Brilliance
If you want to go to twin turbos, probably the easiest way would be to fit the sequential twin turbo system off the Series 3 or later RX7 (1993 on?). It was designed for what you want - small turbo for good low down boost then a bigger one that kicks in as the revs increase.
Here is a pic of the system. The 2 turbos are joined at the exhaust housing.
ok the turbo setup you are talking about is used by cummins on there ktta19 engine. it runs 2 turbos with the inlet air feeding from one turbo to the next, cant remember thr exhaust routing but these are not sequential turbos.Yanmar run a lot of sequential turbos where a system of gates open extra turbos as rpm increses. So have a search for a KTTA19 cummins, Note this is not the highest horsepower rating for that engine by cummins, the highest runs only one turbo!!
They are matched in the sense of airflow. The small one is matched to proveide correct air volume for the engine. This then feeds into the bigger one. This doesnt know it is being fed 14-20 psi, so its no use already feeding that into a small turbo. Hence that matching of correct air flow.
A supre does parallel turbocharging. 3 cyl feed one, the other 3 feed the other. This makes for two small turbos that would roughly equal the size of one larger one.
I'll be running LPG through it, as well as having the injector pump re-tuned again.... estimated output is around 130kw.... 110 is achievable without LPG on 12 pounds of boost..... i realise one turbo would be sufficient....... but hey, it's my mid-life crisis and i'm enjoying throwing an endless amount of cash at my vehicle...... currently purchasing an auto out of an MU to run behind it as well.
