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Air Intake System

westham10

By westham10,
in Engines & Forced Induction

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HYBR3D Collaborator

HYBR3D

Posted
Posted

Ive been looking for something like this thread for a long time! its exactly what a skyline needs if your running a pod, that cold air is quite important!

But, isnt it illegal to drill that hole in the position where you did? (So ive been told) I have two 3" holes in my 32, currently occupied by the intercooler pipes confused.gif but it would be nice to get some sorta setup working in there before my next tune

W0rp3D Grand Master

W0rp3D

Posted
Posted

thanks everybody for all the help and ideas! thanks brett i checked with vic roads to, any mod to your car under your p's is illegal pinch.gif im just gonna go ahead and buy a panel filter instead, looking at the nismo s tune sports air filter

From what i have read on here i would not waste your money on a nismo filter, saw a test on here ages ago that showed the factory filter is the best one available, at best i would (and do) use and non oiled k&n and im making 250rwkw so that will be more than fine in a non turbo.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

thanks everybody for all the help and ideas! thanks brett i checked with vic roads to, any mod to your car under your p's is illegal pinch.gif im just gonna go ahead and buy a panel filter instead, looking at the nismo s tune sports air filter

The car you are driving is illegal for a start.

Just get a K&N panel filter.

Good enough for me @ 365rwkw, good enough for you. About $80-$90 or so. You could probably find cheaper if you shop around

Fry_33 Proficient

Fry_33

Posted
Posted

Just get a K&N panel filter.

Good enough for me @ 365rwkw, good enough for you. About $80-$90 or so. You could probably find cheaper if you shop around

The GTR airbox & snorkel design is much different to the GTST one, the GTR is much more free flowing. What works for a GTR will not always work for a GTST/GTT. Best thing to do is probably put the car on the dyno, get a baseline run with the standard airbox, snorkel and filter. Do another run with the lid & snorkel removed, then another with the filter out. This should let you know if there is a restriction there. For a GTST/GTT I would say the answer is yes there is a restriction. You can always try and put in a new filter with/without the lid & snorkel and see if that makes a difference. I have heard that the standard Nissan filter is quite good for flow. I am thinking of using these and replacing them regularly like I would copper plugs. Standard Nissan panel filter is dry too so no oil on your AFM.

A pod should provide you with the best flow as with the right one the surface area will be much larger than the panel filter. Not to mention the base of the airbox in the GTST/GTT blocks a considerable area where the AFM bolts to it.

westham10 Apprentice

westham10

Posted
  • Author
Posted

The car you are driving is illegal for a start.

Just get a K&N panel filter.

Good enough for me @ 365rwkw, good enough for you. About $80-$90 or so. You could probably find cheaper if you shop around

LOL sorry mate i didnt mean to say gt 't', its a gt 25 non turbo. really i find it hard to believe how a panel filter that can be bought from autobarn is better than something made by nismo specifically for japanese vehicles, but if everyone is saying K&N then i guess ill go with it!

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

The GTR airbox & snorkel design is much different to the GTST one, the GTR is much more free flowing. What works for a GTR will not always work for a GTST/GTT. Best thing to do is probably put the car on the dyno, get a baseline run with the standard airbox, snorkel and filter. Do another run with the lid & snorkel removed, then another with the filter out. This should let you know if there is a restriction there. For a GTST/GTT I would say the answer is yes there is a restriction. You can always try and put in a new filter with/without the lid & snorkel and see if that makes a difference. I have heard that the standard Nissan filter is quite good for flow. I am thinking of using these and replacing them regularly like I would copper plugs. Standard Nissan panel filter is dry too so no oil on your AFM.

A pod should provide you with the best flow as with the right one the surface area will be much larger than the panel filter. Not to mention the base of the airbox in the GTST/GTT blocks a considerable area where the AFM bolts to it.

Yes i realise that.

But on a bog stock (what we thought was a gt-t), it's fine. A gt-t airbox really isn't that bad if you have a look at one. They are a good piece of kit. Hence people make 270rwkw through them with nothing more than a replacement filter.

Now it's a GT - even more so unimportant.

Fry_33 Proficient

Fry_33

Posted
Posted

Just to make sure.. I wasn't having a dig, just wanted to mention some observations I've made with a lot of looking at the standard airbox setup for the R33 GTST. I believe the R34 GTT is nearly the same apart from a slightly different snorkel design. I did buy GTT & GTR ones at some point in the past to see if I could use them instead. I did not. I have had the airbox lid removed at a 200rwkw level and it made a noticeable power change and altered the Air/fuel ratios, so it definitely changed things. I have modified a standard airbox quite a bit and it still didn't make any huge improvements so I am going to look at some alternative options.. :ninja:

I'm pretty sure Stao and others found the airbox a limiting factor and had to cut holes in the lid to flow enough air.

As mentioned though, being a GT, it's not going to change much in this situation.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Ye - on a dyno with the bonnet up :)

Take it out onto the street where the airflow & snorkel are working how they were designed and it's a different story. Dyno fans really don't have the same effect as travelling @ 80-100km/h+

There was a graph about 2yrs ago with back to back. Difference was around 6-8rwkw IIRC on the rollers on a 250rwkw setup. (R33 gts-t airbox it was, using a K&N Filter). Difference ye, but it's not major and certainly not worth the undue hassle you end up with. Depends on the person if they cbf'd with doing a proper CAI setup (that is still illegal).

Fry_33 Proficient

Fry_33

Posted
Posted

LOL.. yeah there is definitely more to it than simple lid off :)

What gets me a bit is the 'cooling panels' that people put over their grill in front of the radiator support bar. These basically block the snorkel flow.. I did start to muck around with fibreglass one that had the snorkel sit sitting low but didn't end up finishing anything.

GTSBoy Grand Master

GTSBoy

Posted
Posted
<br />LOL.. yeah there is definitely more to it than simple lid off <img src='http://www.skylinesaustralia.com/forums/public/style_emoticons/default/smile.gif' class='bbc_emoticon' alt=':)' /><br /><br />What gets me a bit is the 'cooling panels' that people put over their grill in front of the radiator support bar.  These basically block the snorkel flow.. I did start to muck around with fibreglass one that had the snorkel sit sitting low but didn't end up finishing anything.<br />
<br /><br /><br />

Depends on what diverter plate and what car. If you have an R32 GTR bonnet and grile, the diverter plate sits below the top grille bar and so air goes over the top of the grille into the snorkel space. Which would be great if R32s had a snorkel!!

bozodos Grand Master

bozodos

Posted
Posted

I'd be wary of using an oiled filter on an engine that runs a MAF (and a 10+ year old one at that) due to the possibility of oil getting onto the AFM wire. I also would not be cutting holes through metal for that ghetto CAI mod (which incidentally would likely not work with an open pod anyway)

the stock airbox dosen't look that restrictive TBH, pity no one does OTR intakes for Skylines haha

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