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So please explain this Twin Turbo thing

Submitted: Saturday, Dec 01, 2007 at 07:18

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
Karoo Jackal
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Willem

There is more than one way to get a rabbit

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ThreadID: 52144 Replies: 11
Views: 1143 FollowUps: 14
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AnswerID: 274485   Submitted: Saturday, Dec 01, 2007 at 07:21

Member - Franga (QLD) replied:

Hey Willem, me thinks multiples of anything cause to many problems, look what multiples of the opposite sex causes. LOL

Franga
Reply 1 of 11
AnswerID: 274487   Submitted: Saturday, Dec 01, 2007 at 07:28

Member - Alan H (Narangba QLD replied:

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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Reply 2 of 11
FollowupID: 538069   Submitted: Saturday, Dec 01, 2007 at 07:37

Col_and_Jan posted:

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
FollowUp 1 of 1
AnswerID: 274511   Submitted: Saturday, Dec 01, 2007 at 09:10

Nick R (VIC) replied:

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 3 of 11
AnswerID: 274515   Submitted: Saturday, Dec 01, 2007 at 09:53

Member - Mark E (VIC) replied:

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 4 of 11
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AnswerID: 274519   Submitted: Saturday, Dec 01, 2007 at 10:16

Blaze replied:

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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Reply 5 of 11
FollowupID: 538113   Submitted: Saturday, Dec 01, 2007 at 11:49

vuduguru posted:

VW TSI ?
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AnswerID: 274526   Submitted: Saturday, Dec 01, 2007 at 11:23

Member - MUZBRY (VIC) replied:




Gday Willem
I'll tune the VX490 for you.
Murray
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Reply 6 of 11
FollowupID: 538224   Submitted: Sunday, Dec 02, 2007 at 04:56

Willem posted:

Thanks mate. Where were you in 1965 when I needed a mechanic?....lol


Cheers
Karoo Jackal
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Willem

There is more than one way to get a rabbit

FollowUp 1 of 1
AnswerID: 274528   Submitted: Saturday, Dec 01, 2007 at 11:27

Member - Davoe (Yalgoo) replied:

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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Reply 7 of 11
FollowupID: 538226   Submitted: Sunday, Dec 02, 2007 at 05:03

Willem posted:

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
Karoo Jackal
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Willem

There is more than one way to get a rabbit

FollowUp 1 of 1
AnswerID: 274538   Submitted: Saturday, Dec 01, 2007 at 12:58

awill4x4 replied:

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.
Reply 8 of 11
FollowupID: 538225   Submitted: Sunday, Dec 02, 2007 at 04:58

Willem posted:

Thanks Andrew. That is the info I was looking for. Not that a Twin Turbo is on my wish list though...lol

Cheers
Karoo Jackal
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Willem

There is more than one way to get a rabbit

FollowUp 1 of 3
FollowupID: 538249   Submitted: Sunday, Dec 02, 2007 at 09:06

Member - Brian (Gold Coast) posted:

It'd be on mine Willem.....LOL....
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FollowUp 2 of 3
FollowupID: 538349   Submitted: Sunday, Dec 02, 2007 at 23:26

Off-track posted:

Actually I recall reading somewhere that they are two different sized turbos - essentially a primary and secondary that feed into both banks.
FollowUp 3 of 3
AnswerID: 274625   Submitted: Sunday, Dec 02, 2007 at 02:09

Richard Kovac replied:

The answer is the same as one turbo stuffing up :-)
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Reply 9 of 11
FollowupID: 538276   Submitted: Sunday, Dec 02, 2007 at 11:31

Bonz (Vic) posted:

u mean no boost and little go?

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FollowUp 1 of 2
FollowupID: 538341   Submitted: Sunday, Dec 02, 2007 at 21:34

Richard Kovac posted:

Yer something like that .. ;-)
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FollowUp 2 of 2
AnswerID: 274695   Submitted: Sunday, Dec 02, 2007 at 18:56

Member -Signman replied:

The VX 4/90 was 4 cyl OHV- 2 x Stromberg side draught carbs??
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Reply 10 of 11
FollowupID: 538327   Submitted: Sunday, Dec 02, 2007 at 19:40

Willem posted:

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
Karoo Jackal
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Willem

There is more than one way to get a rabbit

FollowUp 1 of 4
FollowupID: 538346   Submitted: Sunday, Dec 02, 2007 at 23:15

disco1942 posted:

For more info see http://en.wikipedia.org/wiki/Vauxhall_VX4/90

PeterD
FollowUp 2 of 4
FollowupID: 538364   Submitted: Monday, Dec 03, 2007 at 07:20

Willem posted:

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
Karoo Jackal
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Willem

There is more than one way to get a rabbit

FollowUp 3 of 4
FollowupID: 538397   Submitted: Monday, Dec 03, 2007 at 10:17

disco1942 posted:

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
FollowUp 4 of 4
AnswerID: 274725   Submitted: Sunday, Dec 02, 2007 at 23:04

Twintrail(W.A.) replied:

willem.at your age stick to one turbo like me and have no problems .regards twintrail
Reply 11 of 11
FollowupID: 538365   Submitted: Monday, Dec 03, 2007 at 07:30

Member - Roachie (SA) posted:

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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