SCJ MONO HELP

My car has been tuned by one of the best in the business and has run flawlessly for the past 4years.

However, I recently purchased a mono blade in place of the 65mm and after a WOT the car immediately goes into limp mode. I sent the TB off to Accufab for an inspection/rebuild and so far John has been very helpful (especially since I didn’t buy directly).

Has anyone else ran into this problem and if so what’s the solution? Also, I did get an updated VMP tune and I’am still on the same JLT 123 that ran great with the 65mm.

Common problem. Usually a tuning issue but if you have the time for the Accufab check up, sounds like you're doing all you can. DBW and TB tuning is not always easy on these cars and most commonly the large mono blades.
-J

You shouldn't need a tune revision to go from a twin 65mm to the mono-blade. A few drive cycles should do the trick..

Sometimes it’s simply a difference in the throttle body actuator motor. I’ve gone thru about 4 or 5 throtttle body motors on my 2010 over the years.

The 2nd to last motor I purchased the motor only from Amazon as opposed to an entire throttle body assembly. My L&M 72 didn’t like this motor and would do the same thing. Ran fine with another motor.

Most tuners simply can't tune the mono. I had a SCJ and nothing but issues with two different dyno tunes; cold start idle issues and limp mode codes. Got a mail tune from VMP and a big improvement but still had minor idle issues. Finally bought a VMP 67mm TB and a free revised tune. No issues, none. Sold the SCJ on ebay. Couldn't be happier
Note: 2012 w/ford 2013/4 trinity blower, injectors and a JLT 123

gr850 said:

Most tuners simply can't tune the mono. I had a SCJ and nothing but issues with two different dyno tunes; cold start idle issues and limp mode codes. Got a mail tune from VMP and a big improvement but still had minor idle issues. Finally bought a VMP 67mm TB and a free revised tune. No issues, none. Sold the SCJ on ebay. Couldn't be happier
Note: 2012 w/ford 2013/4 trinity blower, injectors and a JLT 123

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.
Ran a mono-blade on my 11 for ( 5 ) years, never an issue.
The mono-blade on my 14 has been on for ( 4+ ) years with no issue.
I can't comment on canned tunes, both of mine were tuned on the street.

gr850 said:

Most tuners simply can't tune the mono....

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Wanna know why? They simply haven't researched it sufficiently. The solution turned out to be simple... The story >>

I picked up a KB 168 mono earlier this year. I tune myself. I've been tuning since 2008, but was really hesitant to get this TB because I had never tuned a TB before, much less a mono, and you all know the horror stories. I decided to take this challenge and go for it. Datalog, tweaking, and repeating countless times. Also analyzing the raw datalog data, i.e. the excel spreadsheet, line by line...

The result was success. I started with a 1200 rpm idle I could not lower and a failsafe every time under moderate to heavy acceleration. Now, she idles at 850 rpms, has perfect throttle response and most importantly, no more failsafes. You would never know by driving her that you were controlling a monoblade.... that is until you get into it...

So if you have these issues, either tell your tuner that you know someone that tunes their own GT500 and he knows the solution is in the tune, or dump your tuner, and learn to do it yourself, as I've been preaching for years. My FIRST mod back in 2008, was tuning software!

Many threads on this topic and your specific problem. 100% guaranteed Accufab will clear your SCJ Mono as perfect as they bench test on a universal computer...not GT500 and your concerns will likely remain on return. They had my SCJ 2 weeks. FRPP was supposed to start a SCJ Tech Test Dept sometime late last summer due to the massive complaints & no resolution by Accufab. They had a 5.0 test car at the time but it was involved in a crash. Not sure if they proceeded or if they also planned on GT500 test vehicle. My KB168 also idles at 850rpm works flawlessly , gained 34RW but required stock TB servo. I never did try my stock servo on either one of 2 SCJ's . Maybe that woud've helped? Lund said he saw trends with SCJ issues after 2012-2013. He points finger at Accufab. I thought you boys down in Texas had a good SCJ tuner?

I'm in the same boat, I had a SCJ mono T/B and did a couple tune revisions and could not get the car run correctly. After having a KB168 in my old GT500 and how much everyone likes them I said screw it and went with the XBA setup. I don't have everything yet, but I have faith Lund will get this T/B working perfect. The KB168 is easier to control over the SCJ mono... or say Lund says.

Most likely a tune issue. If you want to stick with canned tunes, then best to go with the combination your tuner has figured out. I do my own tuning now, mostly because my car got complicated and most tuners don’t actually want to tune “your” car. They baseline a certain combo on a mule, then provide that to the masses with some minor tweaks. If the minor tweaks don’t work for you, they move on and you are SOL. I did have one of the widely known tuners, stop tuning my car when I went with a Whipple vs KB supercharger. They had an obvious bias to KB.

69b302 said:

Most likely a tune issue. If you want to stick with canned tunes, then best to go with the combination your tuner has figured out. I do my own tuning now, mostly because my car got complicated and most tuners don’t actually want to tune “your” car. They baseline a certain combo on a mule, then provide that to the masses with some minor tweaks. If the minor tweaks don’t work for you, they move on and you are SOL....

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Very well put.. I might add one other thought..

Tuners need to make a living and cannot afford even one customer that comes back and says, "My motor blew up because of your tune." So, when they send you a tune, they have to insure that it is beyond "safe", to cover themselves. This leaves hp on the table that you will never know of. I have actually purchased tunes from various reputable tuners and, even though I have tuning software, they lock their tunes so no one can see what they actually do, and rightfully so... BUT, with datalogging specific PID's, I can see where their limits are. If you tune yourself, you can be a somewhat more aggressive, while still maintaining a safety factor. This is the reason why my car puts down more hp with my tune than an e-mail tune from someone else.

Willie

Willie said:

Wanna know why? They simply haven't researched it sufficiently. The solution turned out to be simple... The story >>

I picked up a KB 168 mono earlier this year. I tune myself. I've been tuning since 2008, but was really hesitant to get this TB because I had never tuned a TB before, much less a mono, and you all know the horror stories. I decided to take this challenge and go for it. Datalog, tweaking, and repeating countless times. Also analyzing the raw datalog data, i.e. the excel spreadsheet, line by line...!

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We’re all ears..... keep going.


Sent from my iPhone using the svtperformance.com mobile app

gimmie11s said:

We’re all ears..... keep going.

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If you tune, I'd be happy to share the details with you via PM.

Willie

As stated above I received the SCJ back from Accufab which tested good, with only minor tweaks. I reinstalled and made it about 4miles until the dreaded wrench light. I went ahead and ordered the 67mm from VMP along with a revised tune that will be here Monday.
However, John at Accufab has gone above normal customer service and also sent a brand new mono!!! Come hell or high water I will be back on the road this weekend with the help from Accufab, VMP, 2 SCJ’s and a 67mm.
I will be working with my tuner and follow up with the combo that wins.

John at Accufab is a terrific guy. He called my home twice. But sadly they could never resolve my SCJ issues. Noting ..as yours...my issues would hit wrench light as soon as temps rose John even baked my SCJ at 260 degrees for 30 minutes in an oven! Of course...subsequent bench testing still showed it to be 100%...at Accufab ....except for the Tip In Wrench Lights that on me appeared again & again.

Regarding box tunes in 2014 I had the VMP Stage 4 Twin 67/CAI/Pulley. It pulled 648rw. No data logs. A shop quickly got that to 665rwhp. In 2017 the Lund Base tune for my KB168/XBA was data logged. That's when I learned the Base Tune was Fat and was very conservative on Timing. As we data logged fuel was leaned out and I felt that but despite also feeling very strong top end gains the mid range seemed a bit flat. Lund being remote ...asked me to sign a waiver. Custom dynos where I live also are not responsible for dyno failures. From a basic amateur level I wanted AFR where other Custom Tunes had those parameters. Lund obliged and also added timing later suggesting my local Sunoco fuel was not up to par. Having a full tank I added VP Octanium at Lund's suggestion and BOOM.....big power felt on butt dyno...Big flat torque curve..ALL the timing in on data log. I had the AFR/Timing checked at the custom tune Mustang Race shop who told me they would've had the same parameters. Since then I switched to BP fuel as well. Custom Tunes are the best IMO. We have 2 Mustang Dyno Shops here. But when I followed Lund's advice with the KB168+huge JLT148 even they cringed..... So I went the Lund Data Log route. When it did 2 Tune Evaluation pulls they told me the AFR/timing were perfect and it was all kudos. How did Lund tweak the KB168 voltages for idle/off idle driveability/throttle response etc....remains proprietary to Jon Lund.

Jam421 said:

John at Accufab is a terrific guy. He called my home twice. But sadly they could never resolve my SCJ issues.

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Not surprising, as Accufab is not tuning your car. Some tuners do not have the will/desire to make some combos work, for some reason. I hang around the HP tuners forums a bit, and it seems plenty of tuners having success with the SCJ on GT500s. I would be very concerned being chained to a single tuner, as you always want to have options. You can learn to tune yourself, but it is a considerable time investment.

Jam421 said:

....How did Lund tweak the KB168 voltages for idle/off idle driveability/throttle response etc....remains proprietary to Jon Lund.

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LOL.....

69b302 said:

.... You can learn to tune yourself, but it is a considerable time investment.

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.... that pays off big time..... over and over....

Willie

RE: I just installed the brand new SCJ supplied by Accufab and the car runs perfect! I did not reload or switch the VMP tune, just buttoned up and WOT. I put roughly 60miles of every kind of driving imaginable just to verify before I sent the VMP 67mm back.

I will also be sending my old Mono to John for a further inspection.