Tune Help

vastang757 · November 2nd, 2009, 08:05 PM

Ok guys & girls, I just got done installing my JLT intake and loading my custom tune from Brenspeed. I gotta say, the car drives like a beast. I love it. Its like a totally different car... but when I push the clutch in when I'm coming to a stop my RPMs drop to 500, bounce to 700, drop back to 500 then go up and hold at 1000. I'm calling Brenspeed in the morning to see what they say. But since I'm impatient I wanted to know if any of you have had this issue

Grabber523 · November 2nd, 2009, 08:10 PM

Check for vaccuum leaks.

06RedfireGT · November 2nd, 2009, 08:11 PM

+1

Make sure all the clamps are tight, and there is a good seal around the throttle body and where the filter attaches to the intake tube.

vastang757 · November 2nd, 2009, 08:15 PM

Already thought of that and everything is tight

Grabber523 · November 2nd, 2009, 08:33 PM

The only way to know for sure is the smoke test...you'd be amazed at what even spraying carb cleaner looking for leaks can miss...it's not the tune. It's something mechanical.

vastang757 · November 2nd, 2009, 08:34 PM

Dammit. Guess I'm dragging out the halogen and throwing on a hoodie...

Anthony05GT · November 2nd, 2009, 08:36 PM

I've seen that exact problem in the tune before.

vastang757 · November 2nd, 2009, 08:38 PM

Thats not what I want to hear

Grabber523 · November 2nd, 2009, 08:41 PM

You can tune around problems, but once the problem is fixed, the tune will be off. The tune you have was made for a car with no vaccuum leaks. Trust me, I had my KB car apart 3 times inspecting everything, checking for cracked hoses, using zip ties on all tees, spraing carb cleaner around every line and component and never found a leak. Took it to StangHi, and he was able to find vaccuum and fuel leaks that I never saw. Got a datalogger? What are your STFT and LTFTs at?

Ace417 · November 2nd, 2009, 08:55 PM

cars still slow

NastyStang113 · November 2nd, 2009, 08:58 PM

What's the idle set at? Try bumping it up slightly.

vastang757 · November 2nd, 2009, 09:13 PM

Originally Posted by Grabber523

You can tune around problems, but once the problem is fixed, the tune will be off. The tune you have was made for a car with no vaccuum leaks. Trust me, I had my KB car apart 3 times inspecting everything, checking for cracked hoses, using zip ties on all tees, spraing carb cleaner around every line and component and never found a leak. Took it to StangHi, and he was able to find vaccuum and fuel leaks that I never saw. Got a datalogger? What are your STFT and LTFTs at?

I just used the X3 to datalog. I'll check those tomorrow (what are those??)

Originally Posted by Ace417

cars still slow

Its faster than yours

Originally Posted by NastyStang113

What's the idle set at? Try bumping it up slightly.

Looked like 848

NastyStang113 · November 2nd, 2009, 09:20 PM

The idle can't be set at 848 in the handheld. Go look at what the handheld says and than post it.

vastang757 · November 2nd, 2009, 09:23 PM

If thats under the strategic tune part I can't. Says that thats not supported

Ace417 · November 2nd, 2009, 09:25 PM

in the datalog mode you can view the idle

at least mine runs

vastang757 · November 2nd, 2009, 09:26 PM

Yeah, and it said it was 848

NastyStang113 · November 2nd, 2009, 09:41 PM

Go like you're going to reload the tune, than click user adjustment options, or adjust tune, make changes, whatever it says, than check the idle speed in neutral and in gear.

vastang757 · November 2nd, 2009, 09:46 PM

Ok, its set to 850

vastang757 · November 3rd, 2009, 09:02 AM

Anthony05GT · November 3rd, 2009, 09:26 AM

850 should be fine. When was the last time the throttle body and MAF were cleaned?

November 2nd, 2009, 08:10 PM	#2
Grabber523 Your Mom's Favorite 2007 Mustang GT 12.21@111.74 1.789 60' Join Date: Mar 2007 Location: Northwood, ND...Hell Has Frozen Posts: 1,668	Check for vaccuum leaks. __________________ www.myspace.com/grabber523 Grammar/Spelling Nazi Club Member MEMBERS AGAINST MEMBERS AGAINST STUFF CREW FOUNDER

November 2nd, 2009, 08:33 PM	#5
Grabber523 Your Mom's Favorite 2007 Mustang GT 12.21@111.74 1.789 60' Join Date: Mar 2007 Location: Northwood, ND...Hell Has Frozen Posts: 1,668	The only way to know for sure is the smoke test...you'd be amazed at what even spraying carb cleaner looking for leaks can miss...it's not the tune. It's something mechanical. __________________ www.myspace.com/grabber523 Grammar/Spelling Nazi Club Member MEMBERS AGAINST MEMBERS AGAINST STUFF CREW FOUNDER

November 2nd, 2009, 08:36 PM	#7
Anthony05GT Enthusiast Join Date: Feb 2009 Posts: 583	I've seen that exact problem in the tune before. __________________ '05 GT, Whipple, JBA, Zoomers, Centerforce, Metco, J&M, JPC, MGW, FRPP, BBR stage 2 billet cams, McLeod, Diablosport, LFP, Autometer, CDC, tuned by Kevin MacDonald NEED A TIMING CHAIN WEDGE? PM ME

November 2nd, 2009, 08:41 PM	#9
Grabber523 Your Mom's Favorite 2007 Mustang GT 12.21@111.74 1.789 60' Join Date: Mar 2007 Location: Northwood, ND...Hell Has Frozen Posts: 1,668	You can tune around problems, but once the problem is fixed, the tune will be off. The tune you have was made for a car with no vaccuum leaks. Trust me, I had my KB car apart 3 times inspecting everything, checking for cracked hoses, using zip ties on all tees, spraing carb cleaner around every line and component and never found a leak. Took it to StangHi, and he was able to find vaccuum and fuel leaks that I never saw. Got a datalogger? What are your STFT and LTFTs at? __________________ www.myspace.com/grabber523 Grammar/Spelling Nazi Club Member MEMBERS AGAINST MEMBERS AGAINST STUFF CREW FOUNDER

November 2nd, 2009, 08:58 PM	#11
NastyStang113 MM Fanatic 2008 Mustang GT 11.87@119 Join Date: Jan 2009 Location: Florida Posts: 3,726	What's the idle set at? Try bumping it up slightly. __________________ VMP Tuning tuned Roush TVS - 524 rwhp 501 rwtq \| Under Construction \|

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November 2nd, 2009, 09:20 PM	#13
NastyStang113 MM Fanatic 2008 Mustang GT 11.87@119 Join Date: Jan 2009 Location: Florida Posts: 3,726	The idle can't be set at 848 in the handheld. Go look at what the handheld says and than post it. __________________ VMP Tuning tuned Roush TVS - 524 rwhp 501 rwtq \| Under Construction \|

November 2nd, 2009, 09:41 PM	#17
NastyStang113 MM Fanatic 2008 Mustang GT 11.87@119 Join Date: Jan 2009 Location: Florida Posts: 3,726	Go like you're going to reload the tune, than click user adjustment options, or adjust tune, make changes, whatever it says, than check the idle speed in neutral and in gear. __________________ VMP Tuning tuned Roush TVS - 524 rwhp 501 rwtq \| Under Construction \|

November 3rd, 2009, 09:26 AM	#20
Anthony05GT Enthusiast Join Date: Feb 2009 Posts: 583	850 should be fine. When was the last time the throttle body and MAF were cleaned? __________________ '05 GT, Whipple, JBA, Zoomers, Centerforce, Metco, J&M, JPC, MGW, FRPP, BBR stage 2 billet cams, McLeod, Diablosport, LFP, Autometer, CDC, tuned by Kevin MacDonald NEED A TIMING CHAIN WEDGE? PM ME

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