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what size exhaust for 4BD1 tubo

Tech Talk for Rover owners.

Moderator: Micka

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what size exhaust for 4BD1 tubo

Post by def90 »

did a search can't find answer.

currently running non-mandrel 2 1/2" on my 90 and looking at maybe 3" mandrel?

truck is as stated - defender 90, intercooled turbo running 12-14 PSI
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Re: what size exhaust for 4BD1 tubo

Post by Micka »

def90 wrote:did a search can't find answer.

currently running non-mandrel 2 1/2" on my 90 and looking at maybe 3" mandrel?

truck is as stated - defender 90, intercooled turbo running 12-14 PSI
What? :shock:

You don't trust my opinion? :cry:
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Joined: Wed Feb 16, 2005 5:07 pm
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exhaust

Post by def90 »

go and do some work mick :D

nah, i've already made my mind up bud just curious on thoughts...if 2.5L 4cylinder can sound that good, surely a 3.9 can sound better :twisted:

main reason why i wouldn't get it done is if i can't get the dump pipe enlarged, or if its gunna be too much $
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Post by Micka »

Ahh...excuse me?...

Its a 5 cylinder, thank you :roll: :finger:

I will give Steve from Brisbane Exhaust a call tomorrow to suss out a price for you mate.
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Post by ISUZUROVER »

3" would work well Sam, I will be doing the same on the 110 when I get back to OZ and fit the turbo (can you ask your mate to start looking for a T25...). I am not convinced that mandrel bent exhausts are worth the extra money, If I have some spare time I will run a simulation in fluent (used for modelling flow in exhausts and other things) and see what the actual difference is. 3.25" press bent may be just as good as 3" mandrel...

Can anyone give me any info on how much the pipe is squashed by the press for the simulation???
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Post by "CANADA" »

Would a T25 be sufficient for the Isuzu?
[quote="dazza30875"]whats "FAIL" mean[/quote]

[quote="fool_injected"]

Sometimes your funny Canada :D[/quote]
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exhaust

Post by def90 »

ahh bugger forgot about that other 'cylinder', anyways cheers mick, i'll wait for ya reply.

no worries ben i'll call him t'moz.

the small turbo works fairly well on my old girl.
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Post by ISUZUROVER »

MADZUKI wrote:Would a T25 be sufficient for the Isuzu?
As Sam said above...

Also a 4L diesel that redlines at 3000rpm needs to move the same amount of air as a 2L engine that redlines at 6000.
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