89 turbo supra 5 speed dies in mid shift????

cre · 02-15-2011, 01:51 AM

The VPC is a decent piece of hardware.... but it is OLD. By today's standards it's the MAFT Pro's handicapped brother who even gets beat up in the back of the short bus. It's great that it allows the removal of the KVAFM in favor of a speed/density setup, but the "one size fits all" pre-tuned ROM and very basic tweaking controls leave a LOT to be desired by today's standards. Honestly, at this point I'd step up to a MAFT Gen II or a MAFT Pro.... or go full standalone... but they're hell to learn in most cases.

Basic fuel controller are very easy to wire up, tuning takes practice and unless you're also installing a wideband you just have a shop do it for you.

You don't want to run that downpipe on the stock turbo unless you've welded in a dividing plate to separate the air spaces. Aftermarket turbos often have the housing cast so that the wastegate and the exducer's air flow is completely divided... not the case on the stock CT-26. Not doing so makes thins louder than they should be as the primary outlet is leaking out there too and it creates even more pressure that the wastegate actuator has to push against in order to open the gate. =

It does not matter that the outlet of the divorced wastegate pipe is open at the end. With a well flowing exhaust thet's just another matter of noise versus stealth... no performance gain, but no loss this time.

EDIT: There's also the MAP ECU. It's a unit comparable to the MAFT Pro... well the second generation of the MAP ECU is. Like the MAFT Pro, it lets you change over to a different type of air metering system (the MAFT Gen II does also but it lacks support for S/D and doesn't have a built in boost control function) and allows you to tune your fueling... I don't know if it offers wideband O2 integration, boost control or timing control. I have't used it, but in some circles it is VERY popular.

02-15-2011, 01:51 AM	#21
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	The VPC is a decent piece of hardware.... but it is OLD. By today's standards it's the MAFT Pro's handicapped brother who even gets beat up in the back of the short bus. It's great that it allows the removal of the KVAFM in favor of a speed/density setup, but the "one size fits all" pre-tuned ROM and very basic tweaking controls leave a LOT to be desired by today's standards. Honestly, at this point I'd step up to a MAFT Gen II or a MAFT Pro.... or go full standalone... but they're hell to learn in most cases. Basic fuel controller are very easy to wire up, tuning takes practice and unless you're also installing a wideband you just have a shop do it for you. You don't want to run that downpipe on the stock turbo unless you've welded in a dividing plate to separate the air spaces. Aftermarket turbos often have the housing cast so that the wastegate and the exducer's air flow is completely divided... not the case on the stock CT-26. Not doing so makes thins louder than they should be as the primary outlet is leaking out there too and it creates even more pressure that the wastegate actuator has to push against in order to open the gate. = It does not matter that the outlet of the divorced wastegate pipe is open at the end. With a well flowing exhaust thet's just another matter of noise versus stealth... no performance gain, but no loss this time. EDIT: There's also the MAP ECU. It's a unit comparable to the MAFT Pro... well the second generation of the MAP ECU is. Like the MAFT Pro, it lets you change over to a different type of air metering system (the MAFT Gen II does also but it lacks support for S/D and doesn't have a built in boost control function) and allows you to tune your fueling... I don't know if it offers wideband O2 integration, boost control or timing control. I have't used it, but in some circles it is VERY popular. __________________ 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 ---> Last edited by cre; 02-15-2011 at 02:08 AM.