Turbo Boost - How do I find out how much

Submitted: Wednesday, Jul 21, 2004 at 12:02
ThreadID: 14866 Views:1595 Replies:4 FollowUps:6
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Just wondering how I find out how much boost PSI of the turbo on my TD42 is.

Thanks....
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Reply By: Truckster (Vic) - Wednesday, Jul 21, 2004 at 12:06

Wednesday, Jul 21, 2004 at 12:06
If its a GU 7/8psi.

only way is a boost gauge... Installed one in my GQ the other day, took 30 mins. ALso fitted EGT and proper Temp Gauge.
AnswerID: 68790

Follow Up By: Zapper - Wednesday, Jul 21, 2004 at 12:13

Wednesday, Jul 21, 2004 at 12:13
Got a gauge in mine, it only goes to 8 and it runs it up to the stopper on acceleration, just wondering when people are referring to when they say they are running 10 or 12 or whatever PSI - what RPMS are they measuring that at and is it under load etc. Think in a previous thread you said yours is at 10?

My brother in law has a factory turbo GU ute 4.2, he is really dissapointed with the power of that, can they up the boost on it? Dads GQ ute with safari turbo eats it
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Follow Up By: Truckster (Vic) - Wednesday, Jul 21, 2004 at 14:07

Wednesday, Jul 21, 2004 at 14:07
Most are different PSI at Different Ambient Temps and RPM.

My VDO Gauge goes to 30psi.. :( makes me want it! I'd be happy with 12/14psi. that would be awesome.

I've noticed mine us usually ~10psi @ 3000. in the cold (around 3-8degrees) we have been having, it tells me 10psi @ 2500-2800rpm.

Standard cars always run low pressure, for longer life, and to get them out of warranty without issues. I would guess you can run GU's up higher without too much problem...
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Follow Up By: Wazza (Vic) - Wednesday, Jul 21, 2004 at 16:33

Wednesday, Jul 21, 2004 at 16:33
Truckster, I was wondering if you ever got around to fitting them! How about a pic of your install job, did you use a 3 hale gauge surrond?
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Follow Up By: Wazza (Vic) - Wednesday, Jul 21, 2004 at 16:33

Wednesday, Jul 21, 2004 at 16:33
I mean hole
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Follow Up By: Truckster (Vic) - Thursday, Jul 22, 2004 at 09:39

Thursday, Jul 22, 2004 at 09:39
Will take photo tonight.

just heading to my OTHER OFFICE(this is the view out of the window)
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Reply By: Flash - Wednesday, Jul 21, 2004 at 21:12

Wednesday, Jul 21, 2004 at 21:12
A VDO boost gauge, 0-15 psi cost me about $80 yesterday, easy to fit. Nice to know what it's doing. Mine runs 11psi, my son's runs 12 which kicks in fully at about 2000rpm onwards (from there it's limited by the wastegate.)
Less than 2000 it's less boost, eg: about 2psi at 1100 rpm.
AnswerID: 68900

Reply By: Member - Chris M (QLD) - Thursday, Jul 22, 2004 at 09:05

Thursday, Jul 22, 2004 at 09:05
Agree with all above responses Zapper.

Depending on who you go to, what type of turbo, what type of setup etc will vary psi, power and when it cuts in, mine has been setup to cut in at 1500 rpm and depending on ambient temp, psi varies. If my thermo fan is in, and I'm pushing 450-550 degrees, my psi is down as the turbo obviously runs more efficiently when everything is cooler.

If it is a GU, Truckster is right, around 7.5 I was told by Nissan I think 7 or 8 would be more accurate. And another comment was right on the power of the GU TDI with the turbo at 8psi, got into the GU out of mine and thought I was driving a naturally aspirated. Apparently 11 or 12psi gets the GU's up and at em' without putting the mechanicals at any risk, but your warranty will be stuffed!
AnswerID: 68972

Reply By: Truckster (Vic) - Thursday, Jul 22, 2004 at 09:40

Thursday, Jul 22, 2004 at 09:40
4 degrees today, my thing nearly took off going up the hill that it usually hates!!! AWESOME, im moving to Tassie where its always cold
AnswerID: 68986

Follow Up By: Flash - Thursday, Jul 22, 2004 at 20:17

Thursday, Jul 22, 2004 at 20:17
Bugger.
I guess that means mine won't go as well when it's hot up here, (Dodge City/BrisVegas) which is more often than not.
At the moment mine goes well, my son's bloody well flies----- well it would if it had wings.
I'm probably going to get mine to the same specs as #1 son as his is AWESOME.
Cheers

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