Does anyone know what the 'fix' is to the pipework to use two completely seperate filters.

 

I know you need a dummy MAF and the chip has to be changed to read double the air one MAF reads. Is there anything else?

 

I'm not bothered about whether i have enought power to justify it or not so please no ''u need 400-500bhp'' posts lol

 

Cheers

Yaseen

Why not just put the two into one setup it still draws sh*tloads of air and is an easier solution (no chip)

i think the Doolz setup only requires 1 MAF IIRC

i think the Doolz setup only requires 1 MAF IIRC

 

no - still needs 2 - dunno what i was thinking actually LOL :wack:

no - still needs 2 - dunno what i was thinking actually LOL :wack:

 

i was going to say ;)

 

not going to get anymore air from 1 maf lol no matter how many filters you put on lol

 

when i get my zed back its gonna be maf'less :D

i was going to say ;)

 

not going to get anymore air from 1 maf lol no matter how many filters you put on lol

 

when i get my zed back its gonna be maf'less :D

 

yeah, I dunno what i was thinking LOL!! think it was the idle stabilisation mod that i was thinking about which you dont need with the doolz!!

 

Link do a reasonably priced engine managment system with a 1.5bar MAP sensor built in - was thinking of going this route myself if funds allow :)

Yeh i think having an ECU with a map sensor is the way to go and much more reliable!! been looking around at different ECU's at the moment and have a short list so far which isnt really short lol

 

Motec M600

DTA

Opexs

AEM

HKS F-Con

 

They run pretty much in order of expense but just concerned on mapping and future work and mapping, theres a huge discussion on the skyline club about ECU's and the AEM is looking pretty good due to the fact its actually a GEMs based system so theres no reason why any gems mapper cant map it and theres loads of them around

 

Mike

Yeh i think having an ECU with a map sensor is the way to go and much more reliable!! been looking around at different ECU's at the moment and have a short list so far which isnt really short lol

 

Motec M600

DTA

Opexs

AEM

HKS F-Con

 

They run pretty much in order of expense but just concerned on mapping and future work and mapping, theres a huge discussion on the skyline club about ECU's and the AEM is looking pretty good due to the fact its actually a GEMs based system so theres no reason why any gems mapper cant map it and theres loads of them around

 

Mike

 

LOL! just to give you another option:

 

http://www.thor-racing.co.uk/Link_XLEM_EMS-LNK_XLEM.asp

 

looks like they also do a plug & play direct replacement for some nissans for £650! havnt found out if they do one for the Z32 tho :)

JWT dual pop with 1 MAF needs idle stability hose & reprogrammed ECU

JWT dual pop with 2 MAF needs Apexi SAFC to add signals together - no need for hose or ECU

Doolz needs 1 MAF and 1 dummy MAF and reprogrammed ECU

i was going to say ;)

 

not going to get anymore air from 1 maf lol no matter how many filters you put on lol

 

when i get my zed back its gonna be maf'less :D

 

The doolz and the JWT twin pop work by halving the airflow reading. (ie. airflow reaching 3 cyclinders is monitored) A dummy MAF is used on the opposite filter to obtain the same setup for airflow characteristics. Any other setup with an extra filter is a waste of time, as you say :rofl:

 

Steve

 

Steve

Why not just put the two into one setup it still draws sh*tloads of air and is an easier solution (no chip)

because...

 

not going to get anymore air from 1 maf lol no matter how many filters you put on lol

thanks guys, so what's the difference between the JWT and Doolz? and what is this idle stabilisation mod? :confused:

thanks guys, so what's the difference between the JWT and Doolz? and what is this idle stabilisation mod? :confused:

 

2 different types of filter setups JWT offer a single and a dual set up, the doolz is a pure twin setup both good tbh but it all depends on what filters you use :)

2 different types of filter setups JWT offer a single and a dual set up, the doolz is a pure twin setup both good tbh but it all depends on what filters you use :)

ok mike so why does the jwt twin setup need the idle stabiliser mod and the doolz dont? and can you tell me what this mod is and what its supposed to do/how it works?

doolz is shapes like an x, brings the two intake pipes together (wider than stock) then goes to 2 intakes. Air is balanced due to the join and you can use 1 maf and double the signal to get an acurate reading.

JWT is a 90 degree bend on each side to allow 2 filters to be used.

If you use 2 MAF's you read all the air so no probs.

If you use 1 maf and a dummy, the idle will be rough. this is because the 2 sides of intake aren't balanced (ie don't join) and the IACV unit is only on one side. This means that at idle, both sides are not drawing the same amount of air, and the ECU is getting the measurement slightly wrong when doing 1 MAF x 2. The idle pipe is literally a vacuum pipe plumbed in to join both sides together to balance things out.

All of this only applies to the idle, when not idling both sides will be drawing similar amounts of air so no issues.

 

i have the JWT setup with twin MAF's, no problem with idle. Search for dual pop and you should find some of my pictures

I put the drivability patch on mine and it idles near perfectly.

Quote:

Originally Posted by turbopsychosis

Why not just put the two into one setup it still draws sh*tloads of air and is an easier solution (no chip)

Quote:

Originally Posted by kirbz

not going to get anymore air from 1 maf lol no matter how many filters you put on lol

because...

You've got a bit muddled there Yas ;)

Doolz, Whilst this uses 2 mafs, only 1 is actually used for any readings. 2 pipes merge and force the incoming air from both cones to channel out and feed each turbo/intercooler , the 2nd maf is used simply because as air passes through a MAF, it causes a unique charcateristic caused from both speed and pressure, so that both of the doolz pipes have the same characteristic at the meeting point, a dummy maf is used on the left doolz pipe, this is usually from the nissan maxima or early scoobie. downside of this kit is it's length, it really pushes the cones down very low behind the bumper, just nice for our English weather :(

JWT, 2 Sharp radius bends each feeding their own seperate turbo/intercooer pipe and a decent branded cone on the other end, again dummy maf is used normally on the left bank to create that same flow characteristic, however in this case, because both flows of air do not merge, the airflow meter only takes one reading, hence the use of apexi SAFC.

Twincone kit as previously sold by me and now danny.

Idea came from HKS many years ago and is proven to be of benefit, fact ;)

Yes it is limited, in the same way as the doolz, once the maf maxes out, (480ish bhp) thats it no matter how many cones you add it does nowt!

However it does provide far stronger and quicker amounts of colder air as opposed to a single cone does and therefore like the doolz, can increase performance upto the limit of the MAF.

BTW, the doolz has now been updated and should you go down this route, the new version has been shown to be better performing than the original ones sold by Z1, who don't sell the new version cos they never designed it. ;)

IMO if your anywhere near to maxing out your maf now, go for the JWT style, if not then the doolz or the twincone kit, though again and it's just imo, the twincone kit takes edge because 1) it prevents water soak in the mafs which even the singles can't always get away from and 2) should you gain more power and worry your maxing out, simply upgrade to the Q45 MAF, which is not as easy to do with the doolz ;)

cheers

smithy

dohh, jaffa typed quicker than me :D

smithy

Umm i read the whole thread and answers, i think somewhere along the lines someone has said twins are better............. well i run a super afc 2 with my set up (see pic) and when it went back for a rolling road when i put the second cone on and interpro told me it was sucking in a sh*tload more air and had to adjust the afc 2 to compensate so if it doesnt draw more air whos bullsh*tting ???? i know caus i saw the the before and after readings :confused: :confused:

Oh hello smithy MORNIN !!!!

Umm i read the whole thread and answers, i think somewhere along the lines someone has said twins are better............. well i run a super afc 2 with my set up (see pic) and when it went back for a rolling road when i put the second cone on and interpro told me it was sucking in a sh*tload more air and had to adjust the afc 2 to compensate so if it doesnt draw more air whos bullsh*tting ???? i know caus i saw the the before and after readings :confused: :confused:

That's the ticket mate, in a long round about way that's what i was saying ;) would love to have had before and after figures though just to see how much better the extra cone benefitted.

Oh morning :D

smithy

They had to notch about 5 clicks down on fuel that is to say it was plussed up to 4 points extra fuelling then they had to drop it to minus 1 on fuelling

Great info again guys, cheers jaffa, smithy.

 

So it looks like i have the JWT style kit. The extra MAF i have is a knackered Z32 MAF so will be used as a dummy to give the same flow characteristics on both sides. I'll need another chip anyway when i finally get round to taking out the boost jets and fitting my profec e-01 so that can be sorted.

 

I have a length of hose, a t-piece and some kind of mini restrictor/orifice plate that came with what i have below but if the two sides only need to meet to balance them, can I tap into both elbows and connect them together with a hose?

 

Here yer go, all details here.

http://www.ttzd.com/tech/twinpoptech.html

now just make sure yer use some decent air filters, apexis would be good ;)

smithy

Here yer go, all details here.

http://www.ttzd.com/tech/twinpoptech.html

now just make sure yer use some decent air filters, apexis would be good ;)

smithy

i saw that paul, but it makes no sense to me as i never know what i'm looking for just from the instructions lol

 

if both sides only need to be balanced it would be so much simpler to connect the two elbows than do all that, plus i don't have stock recircs anymore, wouldnt know what to do with th apexi bovs

Umm i read the whole thread and answers, i think somewhere along the lines someone has said twins are better............. well i run a super afc 2 with my set up (see pic) and when it went back for a rolling road when i put the second cone on and interpro told me it was sucking in a sh*tload more air and had to adjust the afc 2 to compensate so if it doesnt draw more air whos bullsh*tting ???? i know caus i saw the the before and after readings :confused: :confused:

 

Not sure why you need the AFC2 with only 1 MAF! The stock ecu maps should be able to cope with your airflow as the input information is from a voltage reading from the MAF. This is providing your running no more than around 1bar boost.

 

Your will be drawing more air through your setup than say a stock but so will a JWT single cone filter.

 

The main reason for the increase in airflow and subsequent power output from the JWT & Doolz setup is that the eprom upgrade for the MAF is programmed so that each bank of cylinders can be supplied with airflow from each filter. Therefore, twice as much as your setup.

 

The stock MAF will only supply airflow for around 500-550bhp regardless of how many filters you bolt on the front of it! Move that MAF to monitor airflow to 3 of the 6 cylinders and assume the other 3 are receiving the same airflow and you can turn up the boost, setup the fuelling etc etc and your on the way to putting some big BHP to the rear wheels.

 

I think the doolz claims around another 10bhp from the same setup car with a single pop/MAF

 

 

Steve