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Discussion Starter #1
hey there!

I'm going to have my 2011 DBA GT-R mapped with ecutek. Only mod the car has is a y-pipe (and no plans for anything else e.g. injectors, pumps, exhaust)

Now I found no definitive answer if it adds any gains if I change the stock air filter elements for drop ins like K&N or HKS. Only thing I did read is that their filtration is either bad and/or harmful (oil in the K&N)
So if the difference is negligible I would rather keep the stock air filters.

...and since I should already have the larger facelift intakes, would it make any sense to swap them out for 3" aftermarked ones?
 

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Wouldn't bother with the drop in filters to be fair just go straight to induction

You have the bigger turbo inlets as it's a DBA but you don't have bigger air intakes, they are the same size as the CBA cars, two different things buddy........ you take the stand airbox out and piping and the new intakes attach to those turbo inlets, hope that makes sense.
 

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Discussion Starter #3
ahh yes of course, thanks for clearing that up!

so is there a benefit in adding 3" intakes (in my situation)?
 

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Probably not at stage1 with no plans to go further as you are well within the limitations of the standard intakes..... is an expensive mod to not get any benefit
 

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Now I found no definitive answer if it adds any gains if I change the stock air filter elements for drop ins like K&N or HKS. Only thing I did read is that their filtration is either bad and/or harmful (oil in the K&N)
So if the difference is negligible I would rather keep the stock air filters.

...and since I should already have the larger facelift intakes, would it make any sense to swap them out for 3" aftermarked ones?
I think you've probably read some bad stuff about K&N posted by their rivals.

Filtration is just as good as stock but slightly less restrictive, in that they breathe better but still capture particles efficiently.

Main tuners wouldn't fit, recommend and warranty them as part of a stage 1 upgrade if they were rubbish and allowed particles or oil through. Make sense?

There's probably only a tiny benefit over stock air filters, but K&N do breathe better so also sound slightly better. :)
 

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hey there!

I'm going to have my 2011 DBA GT-R mapped with ecutek. Only mod the car has is a y-pipe (and no plans for anything else e.g. injectors, pumps, exhaust)

Now I found no definitive answer if it adds any gains if I change the stock air filter elements for drop ins like K&N or HKS. Only thing I did read is that their filtration is either bad and/or harmful (oil in the K&N)
So if the difference is negligible I would rather keep the stock air filters.

...and since I should already have the larger facelift intakes, would it make any sense to swap them out for 3" aftermarked ones?
If you are having the car mapped on ecutek, swapping out the intakes offers you better turbo response and more turbo whistle too.

It'll allow your tuner to release more power across the rev band and the cost of intakes isnt that high really - £4-500 for the hardware, 1-1.5 hours labour tops.

Bear in mind though that if you get the larger intakes (above 3") you will soon be maxing out your stock injectors with a risk of lean conditions. That can be mitigated by the tune to an extent.

I did exactly what you are thinking some 7 years ago on my 2009 CBA then about a month later couldnt resist going for bigger intakes and uprated injectors.

It ended up being a slight false economy and looking back I'd have just gone straight for injectors and intakes straight off.

It's the sweet spot of these cars for me before you go big balls like I've now done.
 
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If you are having the car mapped on ecutek, swapping out the intakes offers you better turbo response and more turbo whistle too.

It'll allow your tuner to release more power across the rev band and the cost of intakes isnt that high really - £4-500 for the hardware, 1-1.5 hours labour tops.

Bear in mind though that if you get the larger intakes (above 3") you will soon be maxing out your stock injectors with a risk of lean conditions. That can be mitigated by the tune to an extent.

I did exactly what you are thinking some 7 years ago on my 2009 CBA then about a month later couldnt resist going for bigger intakes and uprated injectors.

It ended up being a slight false economy and looking back I'd have just gone straight for injectors and intakes straight off.

It's the sweet spot of these cars for me before you go big balls like I've now done.
Have to agree.... I went with the drop-ins and ypipe, then shortly after full 4.25 - should have just done that in the beginning
 

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You can max out the stock injectors with the current airboxes fitted easily enough...... for the money it's just not worth the Agro
 

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Discussion Starter #10
stock airbox it is.

I understand everyone who's saying that I should go all out with stage 4.25 right from the get go but to me this is the sweet spot - getting the most out of a stock car with just a y-pipe. I know it's rather safe, it's just a small investment and makes the car considerably faster.

I would only start changing out more components if I decided to go bigger turbo and all that's involved. Which I won't, cause I'm broke :D
 

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stock airbox it is.

I understand everyone who's saying that I should go all out with stage 4.25 right from the get go but to me this is the sweet spot - getting the most out of a stock car with just a y-pipe. I know it's rather safe, it's just a small investment and makes the car considerably faster.

I would only start changing out more components if I decided to go bigger turbo and all that's involved. Which I won't, cause I'm broke :D
I thought the question was whether to keep stock panel filters or swap for K&N panel filters? In which case it takes about 30 seconds per side.

Stage 1 won't make your car considerably faster, you already have 530 bhp and won't notice much difference. You'll be boosting at around 1.1 bar instead of 0.9 bar, so it will feel a bit screamier, and in the real world will pull an extra car length over half a mile or so.
 

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Discussion Starter #12 (Edited)
yes that was the question but it soon derailed to: go for 4.25 ;)
To me it was just about if the drop in filters made any more power in my situation. I don't care about the sound they make. I've read a lot about K&N filters on the US boards now to know I will never install them.

I talked to the tuner and he said the gtr will have about 610bhp and 800nm to 530bhp and 612 Nm before (mapped on 102 octane which is widely available here) Can't imagine the difference won't be noticable.
 

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You'll notice it through the rev range, the car will fee more urgent for sure.

All you can do is map it and see if that where you want to stay I guess
 

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Discussion Starter #14 (Edited)
GTR has been mapped yesterday. added asnu 1050cc injectors as these popped up for sale locally (so just y-pipe and injectors)

635PS (~626,3 HP)
830,75NM (~612.7 ft·lb)

Very happy with the result, car is so much angrier now and blistering fast. Almost too fast for spirited road driving. Need to grow a pair :D
 

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GTR has been mapped yesterday. added asnu 1050cc injectors as these popped up for sale locally (so just y-pipe and injectors)

635PS (~626,3 HP)
830,75NM (~612.7 ft·lb)

Very happy with the result, car is so much angrier now and blistering fast. Almost too fast for spirited road driving. Need to grow a pair :D

great result!! and it can never be to fast! :cool:
 

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Baffles me too given the labour involved is higher than intakes and offers no benefit without them.

Asks questions, get answers, ignores the lot.

Ho hum..
 

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Discussion Starter #19
:popcorn:

is higher than intakes and offers no benefit without them
stock injectors would've been maxed out at ~620PS. so how is there no benefit?

tuner was a very knowledgebale guy so I trusted his expertise in the end. sorry.
haven't had a chance to talk to him beforehand.
 
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