Home / Toyota Supra Forums

Go Back   Toyota Supra Forums! Join the Supra forum! > Performance, Modification, and Maintenance Forums - for generation specific discussions > MKIII Supra

Reply
 
Thread Tools Display Modes
Old 01-08-2013, 01:08 AM   #1
Aero
Stock
 
Join Date: Jul 2012
Location: Alabama
Posts: 11
Aero is on a distinguished road
Default Tuning/Piggyback Questions

I have several questions I want to try to get sorted out. If the answers already exist, which I'm sure some do, please feel free to redirect me as I know how aggravating it can be to constantly repeat the same answer over and over. (But please don't think I'm just asking to keep from having to find them on my own, I have looked, I've just gotten mixed results. I thought if I asked here I might could get a definite answer.)

First of all, my current setup: I've got a 1989 Turbo R-154 with a full 3" exhaust from the turbo back, stock ct26, 2.5" ic pipes, and open air filter. Eventually I would like to upgrade my turbo, probably to the 57 trim, but I'm still considering options so opinions and advice are welcome on this topic too.

1. My first question is regarding the ever so famous lex+550 injector upgrade. I know in order to use the lexus AFM, the injectors have to be upgraded, pretty sure that dead horse has definitely been beaten. But if I upgrade to the 550 injectors and get a fuel controller, is the lexus AFM still necessary? Would a fuel controller be able to adjust the AFR enough to keep it from running too rich all the time?

2. Also, if I do upgrade my injectors, do I also have to upgrade my fuel pump and get a FPR? I've heard that the stock fuel pump is sufficient for the 550's, but I'd like to be sure.

3. I want to get a good piggyback to make sure everything is tuned properly. So far from what I've researched, I like the safc neo. However, I also want an electronic boost controller. I know the Maft Pro is capable of doing both, but I don't really want to convert to S/D. Furthermore, I'm not very experienced with tuning and I don't want to bite off more than I can chew and therefore I'm definitely not ready for a standalone. Is there another piggyback that I can use to tune my car that also has a built in boost controller? Like I said, I'd like to keep the KVAFM. Or, if there isn't a good option for a unit that can do both, can anybody recommend a good electronic boost controller that I can use in addition to the safc neo? I've read about scramble boost and turbo time out features and they both interest me, but aren't necessarily deal breakers either way.

4. With a fuel controller (or a boost controller) will I still hit fuel cut?

5. With a fuel controller (or a boost controller) will I be able to use an actual BOV instead of the stock BPV without the stalling issue between shifts? I'm not really after this upgrade in particular, but if my stock BPV ever craps out in the future I want to know what other BOV options I could consider.

6. While we're on the topic, are there any advantages a BOV has over a BPV besides the cute little whistle? What about vice versa?
Aero is offline   Reply With Quote
Old 01-19-2013, 04:04 AM   #2
cre

Toyota
Racing
Development
 
cre's Avatar
 
Join Date: Apr 2007
Posts: 5,038
cre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond repute
Default

1) If you upgrade the injectors and add a good fuel controller then no, you don't need the Lexus AFM. If the fuel controller is limited then it may make things easier to add the Lexus AFM as the fuel controller is only responsible for 1/2 of the adjustments then... I hope that makes sense.

2) A HEALTHY fuel pump and a HEALTHY FPR can support 550s with no problem. If they're original I wouldn't trust them.

3) Speed/Density is a great and very flexible system but getting it all dialed in can be tough even for a seasoned tuner. The MAFT Pro in general is a tough system to learn on and if you're a complete novice I'd recommend starting with something else unless your Supra is a project/weekend car. I love the MAFT Pro for it's flexibility and expansive feature set and you don't have to convert to S/D if you don't want to. Installed and configured as a basic fuel controller the system becomes much easier to handle... but alas, you can't use the boost control functionality without S/D.

With all of that covered... I have no problem with the Apex'i Neo. It's a strong and stable piece of hardware and has a lot of support in almost every car community.

4) You'll still hit fuel cut unless you supply more fuel per cycle (see: larger injectors or higher fuel pressure). Installing 550's will raise the level at which you see fuel cut.

5) You can't use a BOV with the stock air flow metering system. You'll need to convert to S/D (or a very creative use of another type of airflow meter system) to do this.... Well, that's not entirely true... With a good fuel controller which allows for tuning tip in and out you can tweak things to compensate, I still think there's a performance hit though and for me performance is more important than a toot from the engine bay.

6) There is no benefit to a BOV. I've heard it argued that BPVs may provide a slight increase in performance coming out of a shift and right back in on the throttle. An adjustable BOV or BPV could both be setup to provide that extra response though
__________________
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 --->
cre is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
1jzgte Swap questions!! Travis89Turbo MKIII Supra 1 08-16-2010 12:34 PM
a few questions about the mkIV supra :D:D bad.boy MKIV Supra 4 09-17-2008 01:27 PM
Questions about the oem fuel system Magical Trevor MKIV FAQ 7 08-19-2007 04:40 PM
Need your gus help- a few questions ravenmaster MKIII Supra 10 10-21-2006 09:59 PM
new here, few questions SoooopRa! MKIII Supra 6 08-29-2006 11:25 AM


All times are GMT. The time now is 02:58 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

1986



1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87