Jayson Latham

Should I keep my stock air filter box or replace it with the cone filter ect? My car is stock other than
Stage 1 Bnr turbo that I am about to install but need to know
If I should keep the stock air box and just get a upgraded drop in filter
Or replace it with a cone filter ect. I want my new turbo
To flow really good I hear that stock air boxes
Restrict the flow of the turbo. But on the other hand I hear
The cone filter produce more hear and the gains are minimal. What
Do you guys think? Also I don't see any maf adapters anywhere for an S5

Chuck

iTrader: (2)

This topic has been discussed many times through the years. If your car is not wildly modified, then the stock air box with a good drop in filter will work just fine. If you insist on a cone filter, then you're also gonna have to surround it with some sort box to try and eliminate the hot engine compartment air from running thru the filter. Cooler air is good---hot air is bad. The best way to get more air through the whole system is to change out the exhaust to a decent cat-back system. Even doing this, the stock air box will work just fine. My $0.02 worth

wthdidusay82

iTrader: (15)

You did upgrade your ecu and fuel system i hope? If you haven't that'd be my first concern along with upgrading your inter cooler, unless you're planning on running near stock boost levels and no higher than 8 psi(stock fuel system is at its peak that it can handle very easily).

I personally would upgrade to at least all 720cc injectors, higher flowing fuel pump, Rtek 1.8 or 2.1 or a standalone, and get a vmount intercooler, fmic sucks for a rotary and will make your radiator suffer since it wont get as much cooling with the fmic blocking it.

MMoore4545

iTrader: (7)

V-mount or Front mount a BNR Stage 1? Seriously is a bit of overkill.

I'd keep the stock airbox and drop in a K&N or similar, it is a cold air intake from the factory.

If you are dead set on a cone filter you should probably search around and see how people have made airboxes for them so they only pull cold air.



S5 MAFs are round, not square, so you don't need an adapter.



Also if you're turning the boost up moderately look into a piggy back/rtek and upgraded secondaries. Without a doubt you'll want to get a fuel cut defender.

Look through this (although long) thread which shows how people have their BNR setups.

https://www.rx7club.com/time-slips-d...please-629521/

the general stage 1/2 setup is something like
Rtek1.8
720 injectors
bigger fuel pump

Jayson Latham

Thank guys for your help !! I think it's safer
For me just to get a drop in filter !

Jayson Latham

I have a stock mount intercooler and 3 inch racing
Beat exhaust. Will be running stock boost until I upgrade
Fuel ect. Thanks again

wthdidusay82

iTrader: (15)

Upgrading the intercooler isn't overkill, the stock intercooler is very inefficient as far as cooling goes, a upgraded intercooler is great upgrade for anyone running signicantly higher amounts of boost compared to stock, even those running a stock Turbo.

140-170f intake air temps good? these have been recorded on data loggers by other members running 12 psi on the stock Turbo after doing several runs at the drag strip, meaning heat soak is a major issue and high boosting should be done in short bursts , and not constantly if it is done (your foot will be the boost controller).

There's two options to run cooler iats, upgrade the intercooler, and/or run methanol/water injection.

The bnr stage 1 is good for around 280-320whp on the right setup, and you want this setup to be reliable.

jjwalker

You can actually modify the stock airbox and make it flow more.

On the underside of the lid, there is a baffle. Drill out the plastic rivets and remove that ****. With that baffle, only one side of your filter gets dirty. Why you may ask? It's because thats the only spot air is moving through the filter. Airflow through the filter gets very uniform with this baffle removed.

Secondly, There is a baffle up front. It is attach the panel behind the relays. Also to help, it's what the ducting pipe and hood seals connect to when the hood is shut. Rip that **** out.

The things you just removed where intended to reduce intake noise. It gets a bit louder, but frees up the stock intake up quite a bit.

If pictures are needed, I'll post some up tommorow.

MMoore4545

iTrader: (7)

Interesting I'm running a BNR stage 1 on the stock top mount with some heat tape under it and I rarely see over 115 at 10psi in the Florida heat.


The stock turbo becomes wildly inefficient at/after 12 psi, so that's partially the heat problem. But since the compressor wheel is more efficient on the BNR stage 1 it deals with being at 10/12psi a lot nicer than the factory unit.

I'm not going to turn this into a pissing contest, but we're not talking the stock turbo here. The comment as to the V-Mount for a bnr stage 1 was that he'd spend a big chunk of cash on the setup for what realistic return?

OP: glad you're keeping the boost at stock levels, a handful of people have crossed the 300hp limit (including myself) with the factory top mount. Do research and you'll find what you want.

wthdidusay82

iTrader: (15)

The heat tape is a good point, didn't think of that.

My setup is stock s5 turbo, rtek 1.7, walbro 255lph, 720cc secondaries, stock airbox/intake, stock tmic, with a full turboback exhaust that's all 2.5" other than the mid pipe (came with car).

I'd like to run 10 psi on it , ideally more but I'm afraid of the high temps.

MMoore4545

iTrader: (7)

Dei reflect-a-cool is 15ish bucks a roll. One roll does almost two intercoolers in my experience. I don't have exact numbers but I know it has lowered my overall IAT, and it has slowed how fast my intercooler heat soaks when I park.

With that setup; the stock turbo is the restriction. I wouldn't run more than 10psi on it. Even with a front mount or a v-mount it would probably heat the air up a significant amount more than you would (or I) be comfortable with. It is the next step in your engine upgrades (imo).

With that turbo back exhaust do you see boost creep from the stock wastegate? That's what would worry me more than intake air temps initially.

wthdidusay82

iTrader: (15)

I haven't got the car running or boosting yet, still have to break the engine in, I did port the wastegate out a little bit , up until the tool wouldnt hold the bits anymore, granted it was a cheap wanna-be dremel i got for $15 dollars shipped what could i expect.

I kind of want to port it out more, but I'm hoping how much i ported it that it will be okay, heres a pic. It decided to give out on me not long after i started working on porting the bigger wastegate hole.

I should probably ask on a thread on here if I should port it more, alot of people say porting it isn't really needed , some say its absolutely necessary (on s5 turbo), on the s4 turbo the wastegate for sure needs to be ported because it's nowhere as good as the design on the s5.