I have Mk IV with a BCC, a d/pipe and Greddy Evo exhaust. Up til now I have been using a simple T-bleed which was giving me excellent performance. I just installed a Profec B spec II and am a bit frustrated with it. It's easy to set the boost of course and I have the Hi set to the equivalent of 18 psi (Set at 72%). Problem is that it is nothing like as quick as with the simple bleed which gave me a consistent 16-17 psi. It gets up to 18 psi but, compared to the T-bleed, does so relatively slowly and is not smooth either. The car "feels" like it's put on another 1000 lbs in weight or something. It's probably just a case of the other settings. At least I hope it is. What do you guys set Gain and Start Boost at? Any other ideas as to what the problem might be?

Make sure you don't have any kinks in your hoses going to/from your stepping motor and wastegate actuator[s].
Are you using an aftermarket boost gauge? Check the hose going to it as well.

..also, did you convert to true twin when you put the boost controller in? Your car will feel less responsive in the lower range, but midrange will feel more powerful, without the boost you feel at 4000 rpms.

I checked all the hoses inc. to the Autometer boost gauge. No kinks and no leaks that I can see. Any other possibilities?

Are the right hoses going to the right places on your stepping motor? Sometimes the manufacturer will give you different sized hoses that are meant to go to different ports on the stepping motor.

Yes, the right hoses are going to the right places. It seems that whatever setting I have it on, the second turbo takes a long time to spool up. How can I check that the valve control unit is operating properly?

I'm sure you have your connections right, its just a matter of settings.

What exactly is happening? Are you boosting to your desired psi and dropping off? Does the car not pull hard?

Email me @ ttran@trentontechnology.com and i'll help ya set it up.

Hey thanks VR4. It's been a while since I checked this site. I phoned Greddy and they put me right. The shop that sold it to me gave me all the wrong settings. It's going great now.

Cool, what did they give you?
tell me your settings please, i'd like to compare them to mine.

Btw, i didnt know you started this thread 4 months ago, hehe.

Glad you looked though,

Tony

Hey...please do post your settings...i have been having problems with mine as well, second turbo wont kick in in first gear, some other bullshit too. Anyway if your settings are from greddy i would be interested to see what they are so i have a basis to go off of.thanks

set: 22%
gain: 10%
set_gain: .73kpa

With these settings I am getting 1bar(14.5psi)

I don't know what you are wanting to boost to but I think supras can handle 16psi with stocked fuel setup?
If this is correct, 16psi, i recommend doing this:

set:25%
gain:10%
set_gain: .80kpa

Start from here and go on, I'm sure with these settings and on MY setup, i am gonna boost a little less than 16psi, probably 15.5psi.

Remember now, Mine is a twin turbo setup while yours is sequential, so I'm thinking you will have more of a spike in boost before it levels off to your desired boost. Where are you/the car located at?

please email me for more instant replies because i rarely come on here.
ttran@trentontechnology.com.

Good luck, hope this helps.

I have a 93 MKIV and it is pretty much stock. I have an HKS SSQ BOV, Greddy Boost Cut Limiter, Profec B Spec II, SAFC II and a few Defi gauges. I bought this car this way and it ran great and pulled HARD. A guy I know changed all my settings on my SAFC II as well as my Boost Controller and now it runs like crap. I need to know all the low and high settings for my Boost Controller as well as my SAFC II. PLEASE HELP.

Simple, tell that guy to change your settings back to what they were or shoot him.

You don't mess with someone's settings. Changing your SAFCII settings with fuel upgrades would cause your car to run mad rich and thus flood your engine with fuel.

As for your boost controller, its probably set to where your wastegates crack open way early, thus not being able to build any kind of boost. So basically you're running on wastgate pressure, I'd say around what, 6-9psi? Instead of the 18psi you're used to.

You need to post up any fuel upgrades you may have. You didn't post them initially so I'm thinking you're on stock fuel system just have an SAFCII installed.

So, its down to your EBC. I think the max Supras run is like 18psi right? That makes for 1.24Bar. 18/14.5= 1.24137~

This is what you need to do:

1. set the boost controller to lo boost mode
2. set your warning value to 1.27Kpa(~18.5psi)
- Reason for this for when you're tuning your boost controller, you don't over boost.
3. set your set value to 40 %
4. set your gain value to 10%
5. set your set_gain vlue to .96Kpa(14psi)
- This is recommended by the Greddy manual to set your set_gain value 4psi less than your desired boost level.
6. Do a WOT pull in 3rd gear and make sure it doesnt over boost past 18psi.

At the settings I gave you, you should not be boosting anymore than I'd say, 14psi.

Gradually increase the set value by 3%, and do another pull and log the run to see what boost you make.

Then input the settings accordingly for your LO/HI boost mode values.

I'm basing these settings on a generic car. You should be safe.

But before you attempt these you should do 2 things:

1. Verify you are running on stock injectors/stock fuel system

- Reason being if you have upgraded injectors or fuel system, you'd be running rich and thus need SAFCII tuning.

- An SAFCII is a fuel managment piggyback. If you are on stock fuel system, and its installed, it will have no effect on your car if you are running stock setup.

I think your SAFCII is just installed for looks and serves no purpose at this moment in time with your mods you posted. However, I could be wrong and YOU yourself have no idea you have those mods.

Post back up. Hope this all helps.

Tony

Tony,
I am running the stock fuel system. The stock injectors on this japanese model are the 440cc ones with stock fuel pump. I emailed Greddy the other day and they gave me some stock settings. They also informed me to set my limiter to 99 on a stock setup. I did that along with the settings they recommened and it seems to run a little better. I will try your settings tomorrow and open it up and see what happens. I also believe the SAFC II was installed for looks since the previous owner never upgraded the fuel system. Great thing is I met this guy last weekend who used to be a top tuner in main land Japan and worked for "Top Secret Racing". He instructed me to first upgrade the ECU to a Power FC with commander. Thanks for the fast response and I will let you know how she runs after I change to your settings.

Ah, I knew it served no function that SAFC II You know what though. If it is installed properly, you can still mess something up by playing with the settings, so DONT!!

If some idiot gets on your car and turns your dial knob then you'd be running mad lean/rich and **** up your motor. Please dont let anyone do that.

This is what I suggest. Locate where they are tapped into your ECU and cut those wires in a fashion where they can be resoldered later on.
This is to only supply power to the SAFCII and for "looks" it still functions just fine.

About the guy you met: I'd go with what he says on the ECU thing more than me. I come from another platform and am only trying to apply what I know into the Supra platform.

Even though this is based on something generic, SAFCII tuning, boost controller, you should however have no problems finding tuners to look at your Supra.

Keep us posted.

Those settings from Greddy. I'm sure those are baseline settings. What are you boosting at? Did you log it or make a note of it? How's the rise in boost? Spiking? Linear?

Tony

Tony,
here is what Greddy emailed with. I tried these settings and like I stated earlier, it ran a little better. I then inputted your settings and now the lower IC pipe keeps popping off! I am ready to go to a stand alone and pull all this other crap out. Let me know what you think.


Basically you have 3 main settings. The set boost which controls your main
boost, gain which adjusts boost consistency, and start boost (set gain)
which adjust your boost response.

First you will want to adjust your start boost to about 2 PSI lower than
what your desired set boost is. So if you plan to run 15 PSI for example,
you will set this to 13PSI. Or if you are running KPA, about .1 KPA should
be fine.

Next adjust your gain to about 10-20%, you do not want to go over 20%.

Last drive the car in third gear to make final adjustments. Start at a
lower number with the set boost and increase or decrease the number
according to what the motor is boosting when you test run it.

The warning and Limiter functions are explained quite plainly in the
instruction manual. Do not set these until you have finished setting up the
basic settings explained above.

The warning is set at whatever you wish. And the limiter is suggested to be
set at 99% first to run stock boost. Then work your way down to have the
boost limited just a little higher than what you set boost is boosting at.
The set boost and limiter numbers are not related so you must test run to
tune this function also.

One last thing... Make sure ALL plastic caps are removed from the solenoid
valve before operation, as the boost controller will not function correctly
with the plastic cap still in place.

Thanks for choosing GReddy Products!
--
GReddy Performance Products, Inc.
9 Vanderbilt
Irvine, CA 92618

Trade that pos in for a Profec-S.

Your IC pipe that keeps popping off...Is your car boosting too much? How much is it boosting at? make sure you can clamp it down well or get a T-bolt for it.

Blowing an IC pipe is not bad but you don't want to be in a place where it blows off and you have no means of getting it back on.

That info Greddy gave you is basic dude, it helps but fine tuning is gonna be done on your own.

I hope you get it done soon, I'm sure you're getting quite frustrated at this point.

In regards to getting rid of this POS and goin with the Profec S. Sure its an easier EBC to use but if you know what you are doing with the SPEC II, its just the same.

I have no trouble with mine.

93_supra man, where are you located? I'm in Atlanta, GA.

Tony

Tony,
I am located in Okinawa Japan.

Now when I get on it, around 3000-4000 rpms I start to boost nicely and then I get a big bang/pop from my exhaust like I am running real rich. I will not boost up to 1.2 like it used to. Maybe I'll just give up on this and wait 3 weeks for my Power FC and let the shop Dyno and tune it.