So please explain this Twin Turbo thing
Submitted: Saturday, Dec 01, 2007 at 08:18
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Willem
So some new Landcruisers come fittewd with Twin Turbo's.
So how does this work?
Having read about all the minor troubles people have with Turbo's here on the
forum I wonder how a Twin Turbo will go. One Turbo gets out of sync...then what?
A Looooong time ago afore I knew a little about cars I acquired a Triple Carb Vauxhall VX 490. Geez, when it was tuned right it went like a shower of the proverbial. But when one carby dropped out one had Mega Frustration and aggro.....lol
Cheers
Reply By: Member - Franga (QLD) - Saturday, Dec 01, 2007 at 08:21
Saturday, Dec 01, 2007 at 08:21
Hey Willem, me thinks multiples of anything cause to many problems, look what multiples of the opposite sex causes. LOL
Franga
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Reply By: Member - Alan H (Narangba QLD - Saturday, Dec 01, 2007 at 08:28
Saturday, Dec 01, 2007 at 08:28
Good point Willem
I understand that there is a turbo for each bank of the V8. If one bank was not functioning correctly I can't imagine it doing a lot of good for the engine as a whole.
It is one thing to have one cylinder not quite right but to have a whole bank operating less than the other bank could be interesting.
Alan
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Follow Up By: Col_and_Jan - Saturday, Dec 01, 2007 at 08:37
Saturday, Dec 01, 2007 at 08:37
One possibility (the twin turbo rice burners have this configuration, but the rev heads replace the twin turbos with one massive one) is to have a smaller turbo for low boost at off idle revs, with the second turbo cutting in at higher revs. Its supposed to compensate for the turbo lag. I dont know if this is what the cruiser has though.
Col
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Reply By: Nick R (VIC) - Saturday, Dec 01, 2007 at 10:10
Saturday, Dec 01, 2007 at 10:10
someone must have figured it out, the Bugatti Veyron has 4 on the W16 it runs....... not sure there are many around to get a good idea or reliability tho....
Nick
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Reply By: Member - Mark E (VIC) - Saturday, Dec 01, 2007 at 10:53
Saturday, Dec 01, 2007 at 10:53
Don't worry about it Willem.....I'm sure there is a very ' reliable' computer chip to run it all........ 8-0
Cheers,
Mark
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Reply By: Blaze - Saturday, Dec 01, 2007 at 11:16
Saturday, Dec 01, 2007 at 11:16
Willie Not sure what vehicle it is (poss a Peugeot) I read about a few months back, it had a 1.3ltr donk with a blower for low down power and then shut the blower down at around 2,000rpm allowing the turbo to take over..... Along your thoughts it sounds great if its all running fully tuned, beg head ache if not..
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Follow Up By: vuduguru - Saturday, Dec 01, 2007 at 12:49
Saturday, Dec 01, 2007 at 12:49
VW TSI ?
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Reply By: Member - MUZBRY (VIC) - Saturday, Dec 01, 2007 at 12:23
Saturday, Dec 01, 2007 at 12:23
Gday Willem
I'll tune the VX490 for you.
Murray
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Follow Up By: Willem - Sunday, Dec 02, 2007 at 05:56
Sunday, Dec 02, 2007 at 05:56
Thanks mate. Where were you in 1965 when I needed a mechanic?....lol
Cheers
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Reply By: Member - Davoe (Yalgoo) - Saturday, Dec 01, 2007 at 12:27
Saturday, Dec 01, 2007 at 12:27
More than one Turbo on a diesal is common
the 793 dumpys at work had 2 and the same engines in the shovels i think had 4
from memory one turbo just feeds fewr air inlets
The big and small turbo for the ricers ive heard of before would hacve good applications for slow offroad work and then highway cruising surely.
As for problems
well normally maybe but it is a cruiser so i wouldnt worry too much
- thinking of trading up?. I would think by the time youd geared it up you should get a bit of change from 80k
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Follow Up By: Willem - Sunday, Dec 02, 2007 at 06:03
Sunday, Dec 02, 2007 at 06:03
Thinking of gearing up???...No Davoe.....I am on the downhill side of life and the ole GQ may just have to last the rest of the way....lol. I can do a lot of mods and travelling for 80K!!!!
Cheers
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Reply By: awill4x4 - Saturday, Dec 01, 2007 at 13:58
Saturday, Dec 01, 2007 at 13:58
It's pretty simple Willem. 2 turbo's one for each bank and both turbo's are identical. They both boost into a common inlet manifold or more likely the intercooler is common to both turbo's and then into the intake manifold. so any variation of boost pressure of either turbo is equalised so all inlet ports see the same boost pressure.
Regards Andrew.
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Follow Up By: Willem - Sunday, Dec 02, 2007 at 05:58
Sunday, Dec 02, 2007 at 05:58
Thanks Andrew. That is the info I was looking for. Not that a Twin Turbo is on my wish list though...lol
Cheers
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Follow Up By: Member - Brian (Gold Coast) - Sunday, Dec 02, 2007 at 10:06
Sunday, Dec 02, 2007 at 10:06
It'd be on
mine Willem.....LOL....
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Follow Up By: Off-track - Monday, Dec 03, 2007 at 00:26
Monday, Dec 03, 2007 at 00:26
Actually I recall reading somewhere that they are two different sized turbos - essentially a primary and secondary that feed into both banks.
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Reply By: Richard Kovac - Sunday, Dec 02, 2007 at 03:09
Sunday, Dec 02, 2007 at 03:09
The answer is the same as one turbo stuffing up :-)
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Follow Up By: Bonz (Vic) - Sunday, Dec 02, 2007 at 12:31
Sunday, Dec 02, 2007 at 12:31
u mean no boost and little go?
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Follow Up By: Richard Kovac - Sunday, Dec 02, 2007 at 22:34
Sunday, Dec 02, 2007 at 22:34
Yer something like that .. ;-)
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Reply By: Member -Signman - Sunday, Dec 02, 2007 at 19:56
Sunday, Dec 02, 2007 at 19:56
The VX 4/90 was 4 cyl OHV- 2 x Stromberg side draught carbs??
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Follow Up By: Willem - Sunday, Dec 02, 2007 at 20:40
Sunday, Dec 02, 2007 at 20:40
I seem to recall that this car had triple carbs. 'Twas second hand when I bought it. It was a long time ago so memory could have been corrupted in the mean time...lol
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Follow Up By: Willem - Monday, Dec 03, 2007 at 08:20
Monday, Dec 03, 2007 at 08:20
PeterD
There you go. I am enlightened. I seem to stand corrected on the triple carby bit but somewhere in my past I had a car with triple carbs. Will have to go through my list of 104 vehicles to date to see if I can figure out which one it might have been. Can discount 23 straight away as they were all 4x4's.
Cheers
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Follow Up By: disco1942 - Monday, Dec 03, 2007 at 11:17
Monday, Dec 03, 2007 at 11:17
Willem
You didn't have a jag die you? They had 3, but in reality only ran on 2 - the middle one was operated by the choke control and was only there to provide a rich mixture when cold starting.
PeterD
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Reply By: Twintrail(W.A.) - Monday, Dec 03, 2007 at 00:04
Monday, Dec 03, 2007 at 00:04
willem.at your age stick to one turbo like me and have no problems .regards twintrail
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Follow Up By: Member - Roachie (SA) - Monday, Dec 03, 2007 at 08:30
Monday, Dec 03, 2007 at 08:30
hahahahaha......Willie has yet to graduate to ONE turbo (just like me and my Chev). Naturally aspirated, old-fashioned technology donks are the best way to go in the neva-neva!!!!
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