MAFS - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

240dude · 11-20-2002, 08:19 PM

Sup fellas, i have a ka24e-t in the process and i was wondering if its better for the MAFS to go before or after the compressor?  Has anyone done it? advantages/disadvantages?
Hazards?  Also, anyone know where i can get a lighter wastegate actuator for my AiResearch t3? like around 3.5 psi?
Any info GREATLY appreciated.  Thanks, -John

Steeles · 11-20-2002, 09:23 PM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (240dude @ Nov. 20 2002,9:19)</td></tr><tr><td id="QUOTE">Sup fellas, i have a ka24e-t in the process and i was wondering if its better for the MAFS to go before or after the compressor? Has anyone done it? advantages/disadvantages?
Hazards? </td></tr></table><span id='postcolor'>
I've seen a KA+T with the mafs set up as a blow through (after the compressor)  its a great setup eliminates alot of common turbo problems (runninng rich on downshifts) and has the added benfit of if you blow off an IC pipe or something it doesnt kill the car you just lose all boost and go back to being a 155hp KA <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt='

'>  drawbacks?  none really save for some funky IC piping and a bit of rewireing to get the mafs wires to the other side of the engine bay.  also no need to recirculate the BOV <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt='

'>

240dude · 11-21-2002, 06:12 AM

Hey thanks a lot for the reply, it cleared up a lot of problems for me <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt='

'>  I like that i don't have to recirculate the BOV, who wants turbo without the sound?  Anyone have an answer to where to find a lighter wastegate actuator spring?  Thanks a lot for any replys.        -John

*AceInHole* · 11-21-2002, 09:32 AM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (240dude @ Nov. 20 2002,08:12)</td></tr><tr><td id="QUOTE">Hey thanks a lot for the reply, it cleared up a lot of problems for me <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt='

'> I like that i don't have to recirculate the BOV, who wants turbo without the sound? Anyone have an answer to where to find a lighter wastegate actuator spring? Thanks a lot for any replys. -John</td></tr></table><span id='postcolor'>
actually i'd like a turbo without the sound.....

anyways, there have been problems running the MAFS after the compressor in a blow through setup.  IIRC one guy had trouble with a Cobra MAFS reading correctly, but oddly enough a Granatelli (SP) MAFS (aftermarket cobra MAFS) worked fine in a blow through setup.  The risk is damaging your MAFS or not getting it to read correctly.

Steeles · 11-21-2002, 11:33 AM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (AceInHole @ Nov. 21 2002,10:32)</td></tr><tr><td id="QUOTE"></span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (240dude @ Nov. 20 2002,08:12)</td></tr><tr><td id="QUOTE">Hey thanks a lot for the reply, it cleared up a lot of problems for me <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt='

'> I like that i don't have to recirculate the BOV, who wants turbo without the sound? Anyone have an answer to where to find a lighter wastegate actuator spring? Thanks a lot for any replys. -John</td></tr></table><span id='postcolor'>
actually i'd like a turbo without the sound.....

anyways, there have been problems running the MAFS after the compressor in a blow through setup. IIRC one guy had trouble with a Cobra MAFS reading correctly, but oddly enough a Granatelli (SP) MAFS (aftermarket cobra MAFS) worked fine in a blow through setup. The risk is damaging your MAFS or not getting it to read correctly.</td></tr></table><span id='postcolor'>
same guy, Dennis.  and the problem was with the JWT ecu retune.  didnt wanna work with sstandard mafs for some unknown reason.  but if your not changing mafs just moving it make sure your wiring is tip top and bingo no problems.

240dude · 11-23-2002, 09:21 AM

I have a JWT ecu but its set up for NA so will that make any difference with making the mafs not functoin like it should with a blow buy set up? Thanks  -John

*Jeff240sx* · 11-23-2002, 10:01 AM

Running a blow by MAF is expensive.  You NEED aftermarket cobra MAF, and JWT turbo retune.  If you don't want to go thru that, put the stock MAF 8-14" in front of the compressor, just after the filter.  Only problem you will have is a rich mixture for a split second just after a shift.  Not a huge deal, really.
-Jeff

240dude · 11-23-2002, 11:14 AM

sounds good, i was going to do it pre-compressor but a previous post made it sound like i will run rich enough to stall between shifts.  Thanks and that helps a lot.  John

11-20-2002, 08:19 PM	#1
240dude Leaky Injector Join Date: Mar 2002 Posts: 50 Trader Rating: (0) Feedback Score: 0 reviews	Sup fellas, i have a ka24e-t in the process and i was wondering if its better for the MAFS to go before or after the compressor?  Has anyone done it? advantages/disadvantages? Hazards?  Also, anyone know where i can get a lighter wastegate actuator for my AiResearch t3? like around 3.5 psi? Any info GREATLY appreciated.  Thanks, -John __________________ As soon as you think your going to fast...speed up. 89 Hatchback SE w/ ka24e-t in the making : ) The first Legit excuse for speeding: "If Eintsteins theory of reltivity is correct then having a top speed of over 155mph extends my life."

11-20-2002, 09:23 PM	#2
Steeles Post Whore! Join Date: Sep 2002 Location: 7th layer of hell, special pit of anger Age: 49 Posts: 3,785 Trader Rating: (0) Feedback Score: 0 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (240dude @ Nov. 20 2002,9:19)</td></tr><tr><td id="QUOTE">Sup fellas, i have a ka24e-t in the process and i was wondering if its better for the MAFS to go before or after the compressor? Has anyone done it? advantages/disadvantages? Hazards? </td></tr></table><span id='postcolor'> I've seen a KA+T with the mafs set up as a blow through (after the compressor)  its a great setup eliminates alot of common turbo problems (runninng rich on downshifts) and has the added benfit of if you blow off an IC pipe or something it doesnt kill the car you just lose all boost and go back to being a 155hp KA <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=''>  drawbacks?  none really save for some funky IC piping and a bit of rewireing to get the mafs wires to the other side of the engine bay.  also no need to recirculate the BOV <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/wink.gif" border="0" valign="absmiddle" alt=''> __________________ Keeping it Godzira bishes. So I murdered another turbo

11-21-2002, 06:12 AM	#3
240dude Leaky Injector Join Date: Mar 2002 Posts: 50 Trader Rating: (0) Feedback Score: 0 reviews	Hey thanks a lot for the reply, it cleared up a lot of problems for me <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt=''>  I like that i don't have to recirculate the BOV, who wants turbo without the sound?  Anyone have an answer to where to find a lighter wastegate actuator spring?  Thanks a lot for any replys.        -John __________________ As soon as you think your going to fast...speed up. 89 Hatchback SE w/ ka24e-t in the making : ) The first Legit excuse for speeding: "If Eintsteins theory of reltivity is correct then having a top speed of over 155mph extends my life."

11-21-2002, 09:32 AM	#4
AceInHole Autox Technician Join Date: Dec 2001 Location: New Haven, CT Age: 44 Posts: 3,961 Trader Rating: (0) Rides Gallery: AceInHole Feedback Score: 0 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (240dude @ Nov. 20 2002,08:12)</td></tr><tr><td id="QUOTE">Hey thanks a lot for the reply, it cleared up a lot of problems for me <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt=''> I like that i don't have to recirculate the BOV, who wants turbo without the sound? Anyone have an answer to where to find a lighter wastegate actuator spring? Thanks a lot for any replys. -John</td></tr></table><span id='postcolor'> actually i'd like a turbo without the sound..... anyways, there have been problems running the MAFS after the compressor in a blow through setup.  IIRC one guy had trouble with a Cobra MAFS reading correctly, but oddly enough a Granatelli (SP) MAFS (aftermarket cobra MAFS) worked fine in a blow through setup.  The risk is damaging your MAFS or not getting it to read correctly. __________________

11-21-2002, 11:33 AM	#5
Steeles Post Whore! Join Date: Sep 2002 Location: 7th layer of hell, special pit of anger Age: 49 Posts: 3,785 Trader Rating: (0) Feedback Score: 0 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (AceInHole @ Nov. 21 2002,10:32)</td></tr><tr><td id="QUOTE"></span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (240dude @ Nov. 20 2002,08:12)</td></tr><tr><td id="QUOTE">Hey thanks a lot for the reply, it cleared up a lot of problems for me <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt=''> I like that i don't have to recirculate the BOV, who wants turbo without the sound? Anyone have an answer to where to find a lighter wastegate actuator spring? Thanks a lot for any replys. -John</td></tr></table><span id='postcolor'> actually i'd like a turbo without the sound..... anyways, there have been problems running the MAFS after the compressor in a blow through setup. IIRC one guy had trouble with a Cobra MAFS reading correctly, but oddly enough a Granatelli (SP) MAFS (aftermarket cobra MAFS) worked fine in a blow through setup. The risk is damaging your MAFS or not getting it to read correctly.</td></tr></table><span id='postcolor'> same guy, Dennis.  and the problem was with the JWT ecu retune.  didnt wanna work with sstandard mafs for some unknown reason.  but if your not changing mafs just moving it make sure your wiring is tip top and bingo no problems. __________________ Keeping it Godzira bishes. So I murdered another turbo

11-23-2002, 09:21 AM	#6
240dude Leaky Injector Join Date: Mar 2002 Posts: 50 Trader Rating: (0) Feedback Score: 0 reviews	I have a JWT ecu but its set up for NA so will that make any difference with making the mafs not functoin like it should with a blow buy set up? Thanks  -John __________________ As soon as you think your going to fast...speed up. 89 Hatchback SE w/ ka24e-t in the making : ) The first Legit excuse for speeding: "If Eintsteins theory of reltivity is correct then having a top speed of over 155mph extends my life."

11-23-2002, 10:01 AM	#7
Jeff240sx I hate you too... Join Date: Jul 2001 Location: Tampa, FL Age: 42 Posts: 5,828 Trader Rating: (0) Rides Gallery: Jeff240sx Feedback Score: 0 reviews	Running a blow by MAF is expensive.  You NEED aftermarket cobra MAF, and JWT turbo retune.  If you don't want to go thru that, put the stock MAF 8-14" in front of the compressor, just after the filter.  Only problem you will have is a rich mixture for a split second just after a shift.  Not a huge deal, really. -Jeff __________________ Whatup?

11-23-2002, 11:14 AM	#8
240dude Leaky Injector Join Date: Mar 2002 Posts: 50 Trader Rating: (0) Feedback Score: 0 reviews	sounds good, i was going to do it pre-compressor but a previous post made it sound like i will run rich enough to stall between shifts.  Thanks and that helps a lot.  John __________________ As soon as you think your going to fast...speed up. 89 Hatchback SE w/ ka24e-t in the making : ) The first Legit excuse for speeding: "If Eintsteins theory of reltivity is correct then having a top speed of over 155mph extends my life."