how to make an open turbo

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

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.