tune flat lines at 5500?

na svt · November 17th, 2011, 12:44 PM

Originally Posted by SWEET2KSTANG

it wants to, but...

I'm curious as to why you think "it wants to" rev higher. If the computer is keeping it from reving higher than 7k what do you believe is causing the power to go flat at 5500?

I can't believe you threw n20 at it before getting the tune worked out.

SWEET2KSTANG · November 17th, 2011, 12:48 PM

the car is acting like there is a rev limiter at 6950, and its set at 7200. the tune is done, kinda wish i would of taken it somewhere else to have done. car runs fine, the flat line issue was taken care of.

na svt · November 17th, 2011, 01:01 PM

Some Mach computers don't like to allow the engine to rev. Supposedly Diablo has a cure for this, unsure about SCT or the others.

Where did the peak power end up?

NeverEnuff · November 17th, 2011, 02:09 PM

Been there done this. My GT didn't like anything above 6900-7000ish...and if you kept your foot in it, it would break up and if you stayed in it past that, the ECu would shut down. This is why I went MOD 6 and carb.

Anyway...we also tested a short Mach intake, and it did exactly as you are describing, the stock untouched intake actually pulled better and had more power and TQ...

I think you have having a problem with both. Put a stocker back on it...check your power/tq, then address the ECU issue if its still there.

SWEET2KSTANG · November 20th, 2011, 10:39 PM

after all the crap that i was going thru between driving 3hrs one way to the dyno, work, and other stuff i have going on at the shop; i just wait to go back with the car and ported stock for later date. i'm not worried about power #'s n/a since a procharger set up will be here before long.

when it was having flat line issues, it was only getting like 315hp or something like that and nothing more. now it runs hard and levels off, but doesnt drop power. i have seen this once, and the guy that was doing the tuning has een it before. luckily those issues were addressed with crank sensor replacement.

NeverEnuff · November 22nd, 2011, 05:22 PM

So...you got the tune figured out? Or?

na svt · November 22nd, 2011, 05:26 PM

Originally Posted by NeverEnuff

So...you got the tune figured out? Or?

Hopefully so, because a good running FI combo begins with a good running, efficient n/a engine.

NeverEnuff · November 22nd, 2011, 09:09 PM

Originally Posted by na svt

Hopefully so, because a good running FI combo begins with a good running, efficient n/a engine.

I couldn't have said it better myself.

SWEET2KSTANG · December 17th, 2011, 12:00 PM

Originally Posted by NeverEnuff

So...you got the tune figured out? Or?

believe so. it still has issue with open loop to closed loop transition and dies once in a while, but good other than that.

Originally Posted by na svt

Hopefully so, because a good running FI combo begins with a good running, efficient n/a engine.

good enough for now. think he is looking at a D1 instead of a F1 now

SWEET2KSTANG · December 17th, 2011, 12:02 PM

he did race another customer of mine last night. the built mach on 175 shot vs ls3 vette on 150. even race till about 120, then vette started to edge out. i dont know how much, my lightning couldnt keep up

November 17th, 2011, 12:48 PM	#62
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,540 iTrader: 8 reviews	the car is acting like there is a rev limiter at 6950, and its set at 7200. the tune is done, kinda wish i would of taken it somewhere else to have done. car runs fine, the flat line issue was taken care of. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

November 17th, 2011, 02:09 PM	#64
NeverEnuff Hardcore Enthusiast 1989 LX Coupe 7.1@99mph Join Date: Jan 2009 Location: Texas Posts: 1,685 iTrader: 0 reviews	Been there done this. My GT didn't like anything above 6900-7000ish...and if you kept your foot in it, it would break up and if you stayed in it past that, the ECu would shut down. This is why I went MOD 6 and carb. Anyway...we also tested a short Mach intake, and it did exactly as you are describing, the stock untouched intake actually pulled better and had more power and TQ... I think you have having a problem with both. Put a stocker back on it...check your power/tq, then address the ECU issue if its still there. __________________ 89 LX Coupe-Carb'd 32v-437rwhp NA, 592rwhp N20 01 Bullitt-32v swapped 96 GT-Cammed E85 www.KPERacing.com

November 20th, 2011, 10:39 PM	#65
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,540 iTrader: 8 reviews	after all the crap that i was going thru between driving 3hrs one way to the dyno, work, and other stuff i have going on at the shop; i just wait to go back with the car and ported stock for later date. i'm not worried about power #'s n/a since a procharger set up will be here before long. when it was having flat line issues, it was only getting like 315hp or something like that and nothing more. now it runs hard and levels off, but doesnt drop power. i have seen this once, and the guy that was doing the tuning has een it before. luckily those issues were addressed with crank sensor replacement. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

November 22nd, 2011, 05:22 PM	#66
NeverEnuff Hardcore Enthusiast 1989 LX Coupe 7.1@99mph Join Date: Jan 2009 Location: Texas Posts: 1,685 iTrader: 0 reviews	So...you got the tune figured out? Or? __________________ 89 LX Coupe-Carb'd 32v-437rwhp NA, 592rwhp N20 01 Bullitt-32v swapped 96 GT-Cammed E85 www.KPERacing.com

December 17th, 2011, 12:02 PM	#70
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,540 iTrader: 8 reviews	he did race another customer of mine last night. the built mach on 175 shot vs ls3 vette on 150. even race till about 120, then vette started to edge out. i dont know how much, my lightning couldnt keep up __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

November 17th, 2011, 01:01 PM	#63
na svt 4v Know-it-all Join Date: Jan 2011 Posts: 488 iTrader: 0 reviews	Some Mach computers don't like to allow the engine to rev. Supposedly Diablo has a cure for this, unsure about SCT or the others. Where did the peak power end up?

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