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which MAF should I use 

 

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 Post subject: which MAF should I use
Posted: Sat May 05, 2012 3:01 am 
Oompa Loompa
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Posts: 33

Joined: 26th Nov 2011

Ride: el xr8 opt20

Location: bberg
QLD, Australia

Hi all,

Im in the process of doing some minor performance upgrades to a bog stock el xr8 opt20.

its done a few k's (280,000) but it still runs perfectly and has obviously been well maintained.

the first things I have done are to ensure it keeps running well, so its had a full service.
oil, oil filter, fuel filter, plugs, leads, distributor cap, rotor button, air filter.
full cooling system overhaul including new radiator, coolant, hoses, water pump, thermostat, thermo fans checked and operating well.

now Ive started sourcing some bolt on performance goodies.... got some pacemaker extractors and a twin 2.5inch system.

bought the 'synergy 5000' intake that was on ebay, its an explorer type manifold with blue (24lb???inj) and 75mm throttle.

only other things im planning to do at this stage is to fit some roller rockers, underdrives and a larger MAF.

So, my question to the gurus is.... for my setup which size/what sort of MAF should I use?

any advice appreciated
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 Post subject: Re: which MAF should I use
Posted: Sat May 05, 2012 10:51 am 
Smokin em up
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Age: 37

Posts: 284

Joined: 3rd Mar 2012

Ride: NL Fairlane Ghia V8

Location: Geelong
VIC, Australia

Get an AU V8 MAF, its calibrated for 24 pound injectors so will suit if thats what you have. I'd ditch the 75mm throttle body though, its way too big for your combo. 65mm would be a much better match, or you'll lose torque across most of the rev range.
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 Post subject: Re: which MAF should I use
Posted: Sat May 05, 2012 11:26 pm 
Getting Side Ways
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Age: 41

Posts: 4629

Joined: 23rd Nov 2006

Gallery: 4 images

Ride: 5.0 AU's and 5.0 Maverick

Power: 139 rwkw

Location: Sydney West
NSW, Australia

MAF's are not calibrated for injectors.
It is an old wives tale.
To run 24's correctly you need to have the likes of a J3 reprogrammed.

 

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xr6turnip wrote:
More people paid for a ride in a VT commodore then an AU Falcon so the VT is superior.
Based on that fact my Mum is the best around!

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 Post subject: Re: which MAF should I use
Posted: Sun May 06, 2012 1:59 am 
Oompa Loompa
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Posts: 33

Joined: 26th Nov 2011

Ride: el xr8 opt20

Location: bberg
QLD, Australia

thanks for the replies.

anyone got an au maf they want to sell me?

the throttle body thats on it now is 70mm, it looks like its the factory item and has never been changed?
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 Post subject: Re: which MAF should I use
Posted: Sun May 06, 2012 10:28 am 
Smokin em up
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Age: 37

Posts: 284

Joined: 3rd Mar 2012

Ride: NL Fairlane Ghia V8

Location: Geelong
VIC, Australia

EVL098 wrote:
MAF's are not calibrated for injectors.
It is an old wives tale.
To run 24's correctly you need to have the likes of a J3 reprogrammed.

But the transfer curves are more likely to be fairly close though aren't they. Good enough to do the job.

Obviously could be fine tuned with a QH or similar.
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 Post subject: Re: which MAF should I use
Posted: Sun May 06, 2012 10:31 am 
Getting Side Ways
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Age: 41

Posts: 4629

Joined: 23rd Nov 2006

Gallery: 4 images

Ride: 5.0 AU's and 5.0 Maverick

Power: 139 rwkw

Location: Sydney West
NSW, Australia

The transfer tables are written into the ECU not the MAF.

 

_________________

xr6turnip wrote:
More people paid for a ride in a VT commodore then an AU Falcon so the VT is superior.
Based on that fact my Mum is the best around!

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 Post subject: Re: which MAF should I use
Posted: Sun May 06, 2012 12:57 pm 
EFI Guru
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Age: 52

Posts: 4289

Joined: 5th Nov 2004

Gallery: 28 images

Ride: 351 Vogue,XH 5.0,'17 5.0 Stang

Location: Perth
WA, Australia

Use your 19's with an AU 70mm MAF housing and your 55mm electronics to get you going.
Then get a QH and retune for the AU injectors and the actual AU MAF transfer function when you're ready to go that next step.
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