Have been doing a bit of back to back testing and thought this may be of interest to any zed guys thinking about an induction kit.

 

 

Having tried the following:

 

1)K& N filters that fit in the original air box (no goose honk sound)

 

2) K& N induction kit single mushroom filter (goosehonk sound)

 

3) Self constructed twin intake + two high flow filters

 

Tried option 1 for two months found a little difference but was running standard boost at time.

 

 

Option 2 Tried for 1 year after wirjh JWT and 14 Psi , much better tghan in box filters but goose honk sound started after a few weeks ? was it the filters or the extra boost or the air bnox removal? the latter I would guess.

 

Option 3 Tried for 1 day with above mods.......WOW what a difference!!! no s??t this has added a new dimention to the way the boost builds and the goose honk has changed to an almost meaningfull woop insted of a honk! day two will be on Monday can`t wait!

 

My testing may be not super acurate as maybe the K/N mushroom filter was not the best (used part) but was previously not convinced of the twin induction improvements but I am now.

 

 

 

Jeff TT

Pic link

 

 

 

Jeff TT

there really can be no gain in performance if

A: your running stock turbos, injectors (because the MAF is more than enough to handle the stock power.

 

B: your making two filters still go through the same single MAF.??

you probably got more out of actually changing the filter than the design.

 

this has been well documented on TTNET and you only gain about 10bhp if you move to twin intake (ie two MAFS)

Yes maybe the improvement was due to the increase in surface area of filters perhaps the old filter was actually too restrictive?

 

Response is definatley improved and the goose honk noise has changed pitch so something is going on...any other verdicts??

 

Jeff TT

Hi,

I had K&N Replacement filters in my air boxes and I had goosehonk.

When I changed to an Apexi induction the goosehonk was louder and longer but the pitch stayed the same.

 

Can't really comment on the new Filter you made as I'm not technical enough sorry.

Jeff, the rubber T piece still remains the biggest restriction.

 

A dual intake where the T piece is removed is the best setup although as Warren mentioned, you need the bigger turbo's etc etc the get the best out if it.

 

I get no goose honk with the JWT dual pop intake!

 

If goosehonk really annoys anyone here following an airfilter upgrade..... change the recirc valves for a pair of blow off valves.

 

Steve E

Steve n Jeff,i have the stillen single cone kit with a KN cone filter,Sport 500 Turbos and 555 Injectors,on that basis am i still restricting the power,is the induction i have ok for 500bhp!,cheers,Tony;)

Originally posted by Steve E

If goosehonk really annoys anyone here following an airfilter upgrade..... change the recirc valves for a pair of blow off valves.

Sorry to Hijack Jeff, but it's only a quick one so I'm sure you won't mind :D.

 

Steve, What makes of BOVS replace the recirc's. I want to get some but not sure which ones I should be looking at ?

Originally posted by TonyC

Steve n Jeff,i have the stillen single cone kit with a KN cone filter,Sport 500 Turbos and 555 Injectors,on that basis am i still restricting the power,is the induction i have ok for 500bhp!,cheers,Tony;)

 

Sport 500s wont give you 500bhp. You need to get on a dyno and get a Wheel Horespower Figure. Then go from there, but the assumption is that the MAF maxes out at 5.117 volts and this works out to roughly 460-480 wheel horespower, so above that yes, youll need to move away from a single MAF to get more power.

Tony,

 

Warren has answered the question about power with your setup although you would benefit from the dual pop intake because the voltage reading is half of a single pop because the MAF is only reading air to one bank of cylinders.

 

The dual pop setup assumes that the opposite bank is receiving the same amount of air flow. (Therefore....2 x the amount of airflow of the single pop at the same voltage)

 

A better overall setup once the MAF is maxed out is a MAP(Manifold absolute pressure) Sensor.

 

A 3bar MAP sensor would do nicely!

 

Stuart, Apexi can supply a pair of BOV's to replace the stock recircs.

 

Steve

Well if that isn't a replica of the SE induction system (which I have) then I'm a Dutchman (No offence Eric ;))

 

 

 

Originally posted by Jeff TT

Pic link

 

 

 

Jeff TT

:eek: Thanks Steve,some of what you say i understand, and some i dont!so first off source a dual pop system,then a 3bar MAP Sensor,can i fit it all myself or best get supply and fit,who does em,whats the cost,etc,(can i feck it up having a go myself!):D