how to make an open turbo

91supradude · 03-28-2011, 06:09 PM

Hey guys im new here and need some help with my 1991 supra turbo.
Ive been wanting for a long time to pull off all of the turbo piping that runs to the AFM. i want to relocate the AFM to the throttle body like the 1JZ has. does anyone know of a kit i could buy or something i could make? Anything will help.
Thanks Justin

Travis89Turbo · 03-28-2011, 07:11 PM

Here ya go. This or a full standalon is your options. I hope your not doin it just for the pssshhh sound. Cuz as u can see its expensive.
http://www.maftpro.com/

cre · 03-29-2011, 12:44 AM

There's some confusion here. The 7M-GTE uses a KVAFM where the 1JZ uses a MAP sensor based solution. While the MAP sensor bay receive its signal from any location (it's preferable that it is sourced AFTER the throttle body) the KVAFM does not do well in "blow though" setups. The issue is significant distortions in the vortex which the meter actually looks at to determine air flow. Many systems based on other meters/sensors do not have this issue.

91supradude · 03-29-2011, 06:27 PM

im not just trying to make the noise thats what i have a BOV for lol.. umm what im trying to do is run the turbo open for more air and also i like the look of it. im running a 30r turbo right now but there is so much pluming and i just want to take out some of it but i have to remove the AFM or whatever its call and relocate it by the throttle body

cre · 03-30-2011, 01:52 AM

Are you deaf or dim? Let me know which and I'll repeat myself at either a slower pace with smaller words or just with all caps....

Oh, let's just get it out of the way and cover both:

IT CAN'T BE DONE RELIABLY!

MA70-3.0GT · 03-30-2011, 02:05 PM

As above. Might I suggest an Impreza or Evo as an alternative transport arrangement lol.

In all seriousness though if you insist on the "open turbo" you need to convert to either a MAP based ECU or one that uses either a hotwire or vane AFM (bearing in mind that if you are doing this for "more air" that any form of AFM is going to very slightly restrict the intake simply by having to hang it's own form of measuring instrument in the airflow in order to meter it, so the MAP is the more likely option).

Not that the modification is likely to yield any noticeable gain since the turbo can only suck in as much as it's impeller size/angle & rotational speed (plus other design factors) will allow. So to sum up, if I were you & I was looking to increase performance I'd much rather spend my money on measures to (safely) up the boost such as larger turbo, higher flowing injectors, better I/C etc & only once I'd reached the limit of what the AFM based system was useful for would I consider going to a MAP system.

That's just me however & if you really wanna do this just for the noise & look then your money has to go on ditching the AFM for a MAP based system.

P.S. happy holidays cre

My88isGREAT · 03-30-2011, 04:09 PM

Quote:

Originally Posted by 91supradude

im not just trying to make the noise thats what i have a BOV for lol.. umm what im trying to do is run the turbo open for more air and also i like the look of it. im running a 30r turbo right now but there is so much pluming and i just want to take out some of it but i have to remove the AFM or whatever its call and relocate it by the throttle body

Stop looking at the open turbos in the Import Tuner mag's thinking these are actual road driven cars... Plus you say there is "so much pluming." Ok, if you have a 7m (assuming you do being a 91 unless you have a jz swap then I am not as knowledgeable) it runs the idle speed controller, factory blow off valve, and positive crank case ventilation... and that is not very much... there are different things you can do with the positive crank case ventilation I have seen and know some about but have not attempted yet. last words, AIR FILTERS ARE MADE FORE A REASON.

91supradude · 03-30-2011, 06:51 PM

well right now im running an lexus AFM and lexus 550 injectors on a t4 turbo. im running 6 LBS of boost. how high can i go before it becomes unsafe or fuel cut off?

Green7mgte · 03-30-2011, 10:25 PM

Quote:

Originally Posted by 91supradude

well right now im running an lexus AFM and lexus 550 injectors on a t4 turbo. im running 6 LBS of boost. how high can i go before it becomes unsafe or fuel cut off?

30 is fine. go try it.

or you can take some time and read a few posts. pretty sure its in the faq someplace.

Travis89Turbo · 03-30-2011, 10:33 PM

Quote:

Originally Posted by green7mgte

30 is fine. Go try it.

Or you can take some time and read a few posts. Pretty sure its in the faq someplace.

lmao.........

03-28-2011, 06:09 PM	#1
91supradude Stock Join Date: Mar 2011 Location: San Jose, Ca Posts: 5	how to make an open turbo Hey guys im new here and need some help with my 1991 supra turbo. Ive been wanting for a long time to pull off all of the turbo piping that runs to the AFM. i want to relocate the AFM to the throttle body like the 1JZ has. does anyone know of a kit i could buy or something i could make? Anything will help. Thanks Justin

03-28-2011, 07:11 PM	#2
Travis89Turbo 12psi boost Join Date: Jul 2010 Location: Utah Posts: 332	Here ya go. This or a full standalon is your options. I hope your not doin it just for the pssshhh sound. Cuz as u can see its expensive. http://www.maftpro.com/ __________________ 1995 Toyota Supra SE 71k miles. Master power T70 stock 2jzge 1989 Toyota Supra. 1jzgte swap 5 speed of course.. Driftmotion 60-1 single turbo kit. Cxracing FMIC. 2jz 550cc injectors... soon to come..... EMS Stinger. BC 264 cams 680cc injectors Spec stage 4 clutch and A LOT of boost!------SOLD 1999 Ford F350 diesel 2004 Jaguar XJR Supercharged If it hasnt broke you haven pushed it hard enough!!

03-29-2011, 12:44 AM	#3
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	There's some confusion here. The 7M-GTE uses a KVAFM where the 1JZ uses a MAP sensor based solution. While the MAP sensor bay receive its signal from any location (it's preferable that it is sourced AFTER the throttle body) the KVAFM does not do well in "blow though" setups. The issue is significant distortions in the vortex which the meter actually looks at to determine air flow. Many systems based on other meters/sensors do not have this issue. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

03-30-2011, 01:52 AM	#5
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Are you deaf or dim? Let me know which and I'll repeat myself at either a slower pace with smaller words or just with all caps.... Oh, let's just get it out of the way and cover both: IT CAN'T BE DONE RELIABLY! __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

03-30-2011, 02:05 PM	#6
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	As above. Might I suggest an Impreza or Evo as an alternative transport arrangement lol. In all seriousness though if you insist on the "open turbo" you need to convert to either a MAP based ECU or one that uses either a hotwire or vane AFM (bearing in mind that if you are doing this for "more air" that any form of AFM is going to very slightly restrict the intake simply by having to hang it's own form of measuring instrument in the airflow in order to meter it, so the MAP is the more likely option). Not that the modification is likely to yield any noticeable gain since the turbo can only suck in as much as it's impeller size/angle & rotational speed (plus other design factors) will allow. So to sum up, if I were you & I was looking to increase performance I'd much rather spend my money on measures to (safely) up the boost such as larger turbo, higher flowing injectors, better I/C etc & only once I'd reached the limit of what the AFM based system was useful for would I consider going to a MAP system. That's just me however & if you really wanna do this just for the noise & look then your money has to go on ditching the AFM for a MAP based system. P.S. happy holidays cre __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!! Last edited by MA70-3.0GT; 03-30-2011 at 02:08 PM.

03-29-2011, 06:27 PM	#4
91supradude Stock Join Date: Mar 2011 Location: San Jose, Ca Posts: 5	im not just trying to make the noise thats what i have a BOV for lol.. umm what im trying to do is run the turbo open for more air and also i like the look of it. im running a 30r turbo right now but there is so much pluming and i just want to take out some of it but i have to remove the AFM or whatever its call and relocate it by the throttle body

03-30-2011, 06:51 PM	#8
91supradude Stock Join Date: Mar 2011 Location: San Jose, Ca Posts: 5	well right now im running an lexus AFM and lexus 550 injectors on a t4 turbo. im running 6 LBS of boost. how high can i go before it becomes unsafe or fuel cut off?

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