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29th April 2012, 02:25 PM
#1
How Do I Increase My Fuel Economy/Performance??
I have a 1991 GQ 4.2 Carby and I am investigating options around increased fuel economy (and potentially performance. Don't want to do a Gas Conversion as I don't do big K's in it but still want o maximise economy/performance if possible. It is stock as rock (engine) so just want to find out if I should go Full Exhaust System, Snorkel etc and anything to Carby (if possible??).
Any Advice Appreciated
Cheers
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29th April 2012 02:25 PM
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29th April 2012, 02:46 PM
#2
Smart like tractor
its the same with every motor mate, More Air in (snorkle and quality air filter), more fuel to match, better spark, better exhaust. and a tune. A change in driving style will help too, install a vacuum gauge and it will tell you when you are driving at peak efficiency
Benny
96 GQ coil/Cab
08 G6eT
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29th April 2012, 06:00 PM
#3
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29th April 2012, 06:31 PM
#4
pretty hard to get better than 18 per 100 k`s from those engines , i`de turbo charge it if your serious about it , got a mate with a turbo`d one , goes like stink and better economy when driven sensibly , that is shifts under 2500 rpm , he revs it 3500 though so it chews juice (and tyers )
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30th April 2012, 12:18 AM
#5
As above.
If turbo and shifting at 2500rpm is the go then I'm sold.
BUT your needs first.
Pertronic ignition conversion.
Extractors. (insulated)
2-1/2 exhaust.
snorkel..
reco carby.
for a start at least.
will see fuel and torque improvements.
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30th April 2012, 12:28 AM
#6
RIP - valued member and true gentleman of this forum that will be missed by many!
G'day Robo, the extractors on my TB42 are not insulated. What are the benefits of insulating them?
Rick
RIP - valued member and true gentleman of this forum that will be missed by many!
"As a boat owner and a four wheel drive owner I feel like a pelican: every where I look I see a big bill in front of me”
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30th April 2012, 06:07 AM
#7
Hardcore
Originally Posted by
Silver
G'day Robo, the extractors on my TB42 are not insulated. What are the benefits of insulating them?
Rick
Keeping heat out of the engine bay. cool air = dense more oxygen hot air= thin less oxygen to burn
Whoever appeals to the law against his fellow man is either a fool or a coward.
Whoever cannot take care of themselves without that law is both.
For a wounded man shall say to his assailant,
'If I live, I will kill you. If I die, You are forgiven.'
Such is the rule of honour.
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30th April 2012, 06:49 AM
#8
Banned
Originally Posted by
dirtaddict
pretty hard to get better than 18 per 100 k`s from those engines , i`de turbo charge it if your serious about it , got a mate with a turbo`d one , goes like stink and better economy when driven sensibly , that is shifts under 2500 rpm , he revs it 3500 though so it chews juice (and tyers )
Agreed - I've turbo'd mine, getting well under 18lph (just under 16) on the open road and have the auto (via TPS) changing up at low revs for economy when driving normally (in overdrive by around 50klms per hour in fact).
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2nd May 2012, 06:49 PM
#9
Originally Posted by
Kwakka73
I have a 1991 GQ 4.2 Carby and I am investigating options around increased fuel economy (and potentially performance. Don't want to do a Gas Conversion as I don't do big K's in it but still want o maximise economy/performance if possible. It is stock as rock (engine) so just want to find out if I should go Full Exhaust System, Snorkel etc and anything to Carby (if possible??).
Any Advice Appreciated
Cheers
Before you go shelling out good money on performance parts or chasing that elusive cheap running TB42
Go get a full checkout of the motor
It could being the age most are now and the Ks they have, be well worn now and maybe mite need a rebuild
This age thing and high Ks will help gobble that fuel
The TB42 carbs were never ever cheap to run when new,way back when
They use as much fuel as an early GT 351 falcon,thats terrible,i reckon you could get the GT to run cheaper than the TB42 ...
Then after a full engine condition report id get the carb checked out for maybe air leaks, dud seals or leaks here and there
Extractors and all the other stuff will help on a tired ol engine but they will help better on a healthier engine
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4th May 2012, 06:05 PM
#10
Thanks to all - much appreciated
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