Stock intake with Big Turbo

[OffTheWall503]

Who here is running a stock intake on their big turbo setup? I've seen that our intakes are supposedly rated to 350+ HP, but I've heard concerns of the stock intake hose collapsing on bigger turbo setups.

 

[1azst]

I've gone back and forth between stock and the map intake. With a gtx2860, theres not a difference I can see on v dyno. I have a couple 2" holes drilled in the stock box though.

 

[Hijinx]

I ran the stock box on my car until a few months before my engine build. When I installed it, I did back to back logs. There was no difference. I bought it for the built engine, but decided I'd test it out. That data is somewhere on this forum. [MENTION=2886]FearTheSnail[/MENTION] ran 11.9 on the stock box.


Some Guy On The Internet

 

[Hijinx]

Move along... Nothing to see here.

 

[OffTheWall503]

Stock box, meaning the tube was modified? Or a high flow silicone maybe?

-Matt

 

[Hijinx]

Stock box, meaning the tube was modified? Or a high flow silicone maybe?

-Matt

I had a silicone tube. Fear didn't, IIRC.


Some Guy On The Internet

 

[Hijinx]

Turns out that I did not recall correctly. Forget everything I said about Fear on the stock box lol.


Some Guy On The Internet

 

[OffTheWall503]

So did he have a filter then?

 

[Hijinx]

So did he have a filter then?

He was on a modified 2JR (full 3") for his 11.9 run. He's now on a custom intake from DHM. Hes never been on the stock box for his big turbo. That was my mistake.


Some Guy On The Internet

 

[re-rx7]

Put a Map intake on my cyborg setup. Gained another psi on the same tune if that makes sense.

 

[OffTheWall503]

I've heard that boost generally has increased with an intake. If the flow isn't better, I wonder why the boost pressure increases, even if it is slightly.

 

[shouldbeasy]

Boost pressure increases as it CAN flow more air.

Same thing happens with my supercharged 4Runner - it ends up sucking through a straw with my snorkel so I opened up the intake with a marine application Deck Plate (6"). When closed I max out at 7 psi or so, with it off, 8.5psi.

It would seem that the stock box is fine for a 'stage 3' car (I hate stages...) but if you go with a bigger turbo then it can become a bottleneck of sorts. Albeit, not a huge restriction.

I think a well made and well engineered airbox is the only upgrade - an Injen style intake (and I only pick on them as it was the first to come to mind) doesn't offer any performance gains at all.