Twin Turbo cossie engine?
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Twin Turbo cossie engine?
Does anyone know of any twin turbo cossie engines, was looking at some dinky journal bearing turbos at work today and wondered if one could be made to wake up a T4 a bit earlier in teh revs..
Any info or ideas on how to make it work? would a little turbo be able to hold back the boost of a t4 at say 28psi through its compressor housing?#
I'm sure I've seen a twin turbo'd cossie engine in one of the mags before somewhere.
Cheers
Dan
Any info or ideas on how to make it work? would a little turbo be able to hold back the boost of a t4 at say 28psi through its compressor housing?#
I'm sure I've seen a twin turbo'd cossie engine in one of the mags before somewhere.
Cheers
Dan
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Thats all from memory though and I could have got my wires crossed
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I LOVE looking at the pics... and it is cool as hell in a way!
but lets face it... pretty pointless and the car never did anything did it?
Shame I do love different stuff like this.
Cant help thinking... easier to just start with a bloody great 6 litre V8 in the first place though!
but lets face it... pretty pointless and the car never did anything did it?
Shame I do love different stuff like this.
Cant help thinking... easier to just start with a bloody great 6 litre V8 in the first place though!
Last edited by Porkie; 24-02-2009 at 08:30 AM.
#18
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I was chatting to a guy at pod with a compound charged drag bike (hope to see them again this year, nice blokes) and he was explaining all the details of how he did his. I forget all the details now but he was saying how blowing one into another created a ratio of 3:1 for boost ie 1 bar +ve into the other turbo created 3bar +ve in the larger turbo. I seem to remember the reason being a small turbo will reach 1 bar (and thus create 3 bar total) faster than one big single turbo?
Thats all from memory though and I could have got my wires crossed
Thats all from memory though and I could have got my wires crossed
I have no personal experience of compound charging, only information gained from others who have done it.
Fundamentally though the basics seem to be:
- The large turbo wont make as much power as it would without the smaller one also present
- The small turbo wont spool as quickly as it would without the larger one present
- You'll make more power than the small one could, and will spool quicker than the large one can
- unless you are wanting to run huge boost pressure (the 3 bar you mentioned wouldnt even be the low boost setting on some compound charged competition diesel motors!) its very unlikely you will be able to better the spool and power of a well matched single turbo.
Last edited by Chip; 24-02-2009 at 08:43 AM.
#19
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I LOVE looking at the pics... and it is cool as hell in a way!
but lets face it... pretty pointless and the car never did anything did it?
Shame I do love different stuff like this.
Cant help thinking... easier to just start with a bloody great 6 litre V8 in the first place though!
but lets face it... pretty pointless and the car never did anything did it?
Shame I do love different stuff like this.
Cant help thinking... easier to just start with a bloody great 6 litre V8 in the first place though!
Get one into your westy ASAP
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The crank story i would take with a pinch of salt , in the real world could you ever see that car being practical & working ? again ava trying to make something different.when you get mark shead staying with one turbo & getting results without making things alot harder like above.Seems to me like they make things harder for themselfs.
#29
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Not really true from what I have seen, the smaller turbo will flow some exhaust gas which will then go onto the bigger turbo, but typically the smaller turbo will also have a wastegate (either internal or external) to allow much of the exhaust gas to bypass it completely to prevent over spooling it, and both the gas that has gone through the turbo and the gas that has gone down the wastegate is then directed back into the exhaust inlet of the bigger turbo.
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The crank story i would take with a pinch of salt , in the real world could you ever see that car being practical & working ? again ava trying to make something different.when you get mark shead staying with one turbo & getting results without making things alot harder like above.Seems to me like they make things harder for themselfs.
I know Martin very well and thats the truth. There was development on the engine exactly like the other have gone through when pushing the power. Unfortunately this wasn't an open cheque book job! Also this wasnt alans first TT cossie!
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Not really true from what I have seen, the smaller turbo will flow some exhaust gas which will then go onto the bigger turbo, but typically the smaller turbo will also have a wastegate (either internal or external) to allow much of the exhaust gas to bypass it completely to prevent over spooling it, and both the gas that has gone through the turbo and the gas that has gone down the wastegate is then directed back into the exhaust inlet of the bigger turbo.
gotcha. thanks
#36
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What rpm is 3000 earlier than euans, I dont know what rpm his made peak bhp or torque at in the first place?
what was the bhp and what was the torque on this TT thing?
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Wether or not this car/turbo setup did/would've delivered the goods i love it for trying to be different, always nice to see unusual things being done.
Cheers for the info chip, ive learned something new today
Cheers for the info chip, ive learned something new today