8 replies to this topic

[scw02102]

Is the 80mm MAF required for stage 4 tubby?

 

Does it make much difference?

[mbes2]

Only works when a chargecooler is fitted 

[siztenboots]

It depends, what one tuner considers a stage 4 may not actually have a charge cooler fitted, so really its just a stage 2 intercooled.

 

So depending on the amount of airflow and thus torque and bhp, will determine if you need to have a 70 or 80.

 

Personally , I would always advise on the 80mm, fit it once and then its done.

 

Either way, it will need a small update to the map, which I can do to any tuners maps , or they will do it (beware if you are not the original customer of the remap as many will charge again for a full remap)

[Dave E]

Still on my original 70mm with a Courtenay (for want of a better description) stage 4 map. Always used oem paper filter and never had an issue with it. One thing I've never understood, the turbo intake is less than 70mm so how would increasing the diameter of the pipe work and maf help? Come to think of it the exit from the air box is 70mm which surely makes an increase of maf size, which uses the same sensor, redundant?

[scw02102]

im thinking off getting water/meth injection and last time mine was mapped the mapper mentioned that i was pulling nearly 5v from my maf which is the max and it may need changing at some point

 

dont want to get the water injection mapped to be told ur maf is restricting u and it needs another tweak

 

if u recommend the 80mm do I need new pipe work? see my engine below

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[mbes2]

I changed mine to 80mm pipework from filter to top of turbo.. then 80mm from top of charge cooler to top hat. I modified the down pipe from turbo to lower charge cooler pipe as it kept popping off. You could just leave your current setup but to maximise everything, every tweak counts

[Nev]

Still on my original 70mm with a Courtenay (for want of a better description) stage 4 map. Always used oem paper filter and never had an issue with it. One thing I've never understood, the turbo intake is less than 70mm so how would increasing the diameter of the pipe work and maf help? Come to think of it the exit from the air box is 70mm which surely makes an increase of maf size, which uses the same sensor, redundant?

 

I'd say that the main reason is that the so called "80mm MAF" actually only has an internal diameter of 71mm. Then if you consider that it's cross sectional area is also slightly reduced by the housing that holds the platinum wire. Thus in actual fact, it is approximately comparable in flow to a 70mm O/D pipe.

 

Any improvement of flow from air-box to turbo is a good thing really as any resistances have to be overcome by the engine.  

Edited by Nev, 04 June 2016 - 01:29 PM.

[Nev]

im thinking off getting water/meth injection and last time mine was mapped the mapper mentioned that i was pulling nearly 5v from my maf which is the max and it may need changing at some point

 

dont want to get the water injection mapped to be told ur maf is restricting u and it needs another tweak

 

if u recommend the 80mm do I need new pipe work? see my engine below

 

If you are trying to tune your car, Id recommend improving airflow from airbox to turbo neck to 76mm up to "stage 4", increase the MAF size too. It will all help. The top hat mounted on the throttle body is also a nasty restriction. All pipework should be lagged or insulated, as it is in the worst possible hot place directly above the exhaust manifold. Id say for sure that throwing away that stupid red "colour coordinated" inlet pipe and installing a £10 section of well lagged 76mm alu pipe would probably give you back 25 BHP on a hot day. Remember, function over fashion is what will make you car fast.

 

Edited by Nev, 04 June 2016 - 01:35 PM.

[scw02102]

never thought of the heat from the manifold heating up the inlet pipe

 

good thinking, now to find some alloy pipe....