03 mach 1 with 9r07b update

[tirefryer4.6]

i have an 03 mach 1 with the u7146. you all have been of amazing help to me, and i thank you, now being in arizona i can only get 91 unless i feel like dishing out 6 bucks a gallon for 100 octane. my problem has been it has only slowed my car down 3-4 thenth in the quarter, and and the car knocks like crazy all the way through, i took timing out like you suggested and it made very little difference, i then updated to the 9r07,made little difference, now i read that the 9r07b has tunes for 87 91 and 93. just updated my predator last night and attempted to try the 91 tune, but my only option is still 93 performance tune, is the 87 and 91 tunes hidden? i have connections with a local dealer for diablo sport and can get a custom tune, i feel with just 4.10 gears and bassani cat back i shouldnt need one though. any help is much appreciated, i still support you guys all the way and love the product, i just want to show every body what these things can really do, thank you all for your time and help.

[Shaken]

i have an 03 mach 1 with the u7146. you all have been of amazing help to me, and i thank you, now being in arizona i can only get 91 unless i feel like dishing out 6 bucks a gallon for 100 octane. my problem has been it has only slowed my car down 3-4 thenth in the quarter, and and the car knocks like crazy all the way through, i took timing out like you suggested and it made very little difference, i then updated to the 9r07,made little difference, now i read that the 9r07b has tunes for 87 91 and 93. just updated my predator last night and attempted to try the 91 tune, but my only option is still 93 performance tune, is the 87 and 91 tunes hidden? i have connections with a local dealer for diablo sport and can get a custom tune, i feel with just 4.10 gears and bassani cat back i shouldnt need one though. any help is much appreciated, i still support you guys all the way and love the product, i just want to show every body what these things can really do, thank you all for your time and help.

The Mach's only have the 93 performance tune try dropping the WOT timing 10% in both ranges and go from there if you need to remove or add.

[tirefryer4.6]

THANKS FOR THE QUICK REPLY, NOW IS THIS 10% IN GENERAL OR 10% OF TOTAL WOT TIMING? THE REASON IM ASKING IS BECAUSE I TRIED RETARDING TIMING BY MOVING THE SLIDER TO THE NUMBER 10 IN BOTH AREAS, AND THE ENGINE STILL MAKES THAT SAME RATTLING SOUND WITH ANY AMOUT OF THROTTLE ASIDE FROM CRUISING, MOVED IT IN EVERY INCRAMENT IN EACH DIRECTION AND DIDNT CHANGE THE PROBLEM, IS THEIR ANYTHING ELSE I CAN TRY? VERY NICE MACH 1 BY THE WAY.

[Shaken]

THANKS FOR THE QUICK REPLY, NOW IS THIS 10% IN GENERAL OR 10% OF TOTAL WOT TIMING? THE REASON IM ASKING IS BECAUSE I TRIED RETARDING TIMING BY MOVING THE SLIDER TO THE NUMBER 10 IN BOTH AREAS, AND THE ENGINE STILL MAKES THAT SAME RATTLING SOUND WITH ANY AMOUT OF THROTTLE ASIDE FROM CRUISING, MOVED IT IN EVERY INCRAMENT IN EACH DIRECTION AND DIDNT CHANGE THE PROBLEM, IS THEIR ANYTHING ELSE I CAN TRY? VERY NICE MACH 1 BY THE WAY.

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10% of WOT timing with this crom should be around 2.5 degrees. As far as part throttle detonation. I would get gas from another station, check for a unmetered air leak (vacuum leak post maf), egr malfunction or low fuel pressure (maybe fuel filter?).

[tirefryer4.6]

i usually get gas from about three different stations,but is possiable that they all have crappy gas, fuel filter is less the 6 months old so pretty sure thats not the issues, and as far as unmetered air it should affect the car when not running the tune, same as far as low fuel pressure and egr malfuntion goes. all great ideas though, ill try tunning in the 2.5 degrees again and see where it goes, id love to get this working so i dont end up spending $100 and end up with the same issues. if you have any other ideas please let me know, again thank you for taking time to help me out, its greatly appreciated.

[Shaken]

i usually get gas from about three different stations,but is possiable that they all have crappy gas, fuel filter is less the 6 months old so pretty sure thats not the issues, and as far as unmetered air it should affect the car when not running the tune, same as far as low fuel pressure and egr malfuntion goes. all great ideas though, ill try tunning in the 2.5 degrees again and see where it goes, id love to get this working so i dont end up spending $100 and end up with the same issues. if you have any other ideas please let me know, again thank you for taking time to help me out, its greatly appreciated.

I know the WOT timing for this crom is ALOT more aggressive than stock. If I remember correctly the factory tune netted about 17 degrees, where this crom I have seen as high as 25 and then settle down to around 21.5 degrees. Since you have a part throttle detonation issue, my first thought would be fuel since you have not had this problem previously. I have seen in this forum people with similar issues have bad cats, the other with a damaged egr tube.

[tirefryer4.6]

ok, so i took out 2.5 deg out in both ranges and it did settle down alot with the detonation, but still did it when accelerating in 3 4 5 gears but still not near as bad as it was, egr tube checks out good, and i put some chevron fuel in the car to make sure i had some better fuel while playing with the tune, will running a log or real time data help me figgure out what i need to do to get detonation fully tuned out? and wich parts on the log graphs should i be paying attention to?

[Shaken]

So you took out 10%, you would think that would have been enough. You still should have 10% left to retard at WOT. The ranges for our tool is 10% advance and 20% retard if I remember correctly. Data logging should be in 4th gear from 2k-up at the track since doing it on the road is dangerous and illegal. I believe it is in the diagnostic menu WOT timing I chose the default pids. Our cars have knock sensors and are suppose to pull timing out if it sees detonation. I have heard that it could be up to 8 degrees so you would see it in the data log.

[tirefryer4.6]

sweet, my next race is the 16th so i can log it then and see how it goes, ill let you know what i find and again thank you for your help, it allways help to have a fellow mach 1 owner to assist me, i can be confident that you know your stuff.

[Shaken]

When I first got my Mach 1 like most people you want to tweak the most out of it. Being a old school drag racer I have a 66 Chevellle that runs 10.60's with a smallblock no power adder and this was 20 years ago http://www.youtube.com/watch?v=G1DnadY2cSk. These guys here know way more than I and remember google is your friend after you weed though it LOL. Learn to use the software it will tell you alot when you are at the track. Remember treat your data recording like a dyno run 4th gear pull. The only adjustments you can make do not affect drive ability. I do wish they would have included a way to adjust the Idle Air Control valve instead of using plates with different orifice sizes. Also since you do not have a wideband o2 you could be leaving a little power by not being able to monitor the WOT fuel adjustment. Which brings up cost and the thoughts of a dyno tune which could be what you need to take care of your part throttle detonation if you can not get rid of it with better fuel. I never planned to make my Mach a drag car, I just wanted to improve it a little being a drag racer.

[tirefryer4.6]

i know what you mean, i bought my mach as an occasional racer and im in the process of building a 76 camaro for racing, but the mach 1 has a type of fun thats hard to beat, thank you again for all your help, ill let you know how it goes