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Discussion Starter #1
Need inputs on how to get the best timing advance. I have the BDPP of course it gives you *2. Whats the best?
 

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+4* would require higher octane gas.

UpRev allows +/- 2* since it's the maximum safe on regular.
 

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Some info I found a few years ago said to raise the octane level by one for every two degrees of timing advance added to the OEM timing curve. So adding two degrees of advance to an 87 octane motor would require 88 octane.
 

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hat has never peally been preoven. not saying that you're wrong.
Deerslayer is running +4 on 87 with no problems.
i even ran it for a bit with no problems or knocking.
I still wouldn't risk it.

IMHO, 10-15 hp isn't worth a $4000 engine.
 

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Discussion Starter #7
Well thanx guys i had no idea about any of that when i get the gt ill b sure to run high octane. now i just need a bdgt much more than the bdpp
 

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dude, i'd like to see 2* of timing adding 10-15 hp's that would be awesome.
It's not that unlikely.

I know in the 3V 4.6L Ford's, a Superchips tuner adds 2-3* of timing and picks up a good 10-15 hp.

On the GT500 it adds 3* and they pick up nearly 25hp.
 

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Discussion Starter #10
dude, i'd like to see 2* of timing adding 10-15 hp's that would be awesome.
Well ive never tested this or anything but i could tell a pretty big difference with the 2* advance with just my pp. Drove it without the advance then added it and drove it again... seemed to make a good diff.
 

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Well ive never tested this or anything but i could tell a pretty big difference with the 2* advance with just my pp. Drove it without the advance then added it and drove it again... seemed to make a good diff.
I had my 2* advance on when I had my truck dyno'ed in my baseline dyno thread. I wanted to see the difference that Thorley's TRULY made so I did a baseline run and going back after I get my truck back out of the shop.

After I have it back I'll try to remember to make a pull without 2* to see what the difference is.
 

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I run 91 octane and have 3+ timing.

I've always been hesitant to go any higher.

Is it safe to go to +4, if I'm running 91?
 

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I run 91 octane and have 3+ timing.

I've always been hesitant to go any higher.

Is it safe to go to +4, if I'm running 91?
Should be. Worst case scenario is it will knock, a knock sensor will pick it up and the ECM will retard the timing until it quits knocking.

I DEFINITELY wouldn't run more than 2* on regular though so if you decide to do 4*, always run at least 91.
 
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Discussion Starter #14
I had my 2* advance on when I had my truck dyno'ed in my baseline dyno thread. I wanted to see the difference that Thorley's TRULY made so I did a baseline run and going back after I get my truck back out of the shop.

After I have it back I'll try to remember to make a pull without 2* to see what the difference is.

Thatd be cool man let us know. and im glad i asked about this I had no idea about the octane to timing advance. Some good info.
 

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These engines have knock sensors. If you advance the timing higher than the ECU can safely adjust it while using regular 87 octane, it'll knock. Otherwise, you won't hurt anything. I took the 2 degree advance off because I didn't feel any difference. But my butt dyno must be off because a lot of people are claiming they can feel a difference...lol.
 

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These engines have knock sensors. If you advance the timing higher than the ECU can safely adjust it while using regular 87 octane, it'll knock. Otherwise, you won't hurt anything. I took the 2 degree advance off because I didn't feel any difference. But my butt dyno must be off because a lot of people are claiming they can feel a difference...lol.
If I'm not mistaken, the ECM can adjust +/- 2 degrees. I'm pretty sure that's the reason UpRev only allows you to adjust +/- 2 degrees as well, so if something isn't going right, the ECM can compensate.
 

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If I'm not mistaken, the ECM can adjust +/- 2 degrees. I'm pretty sure that's the reason UpRev only allows you to adjust +/- 2 degrees as well, so if something isn't going right, the ECM can compensate.
That would make sense. My BD can only do a 2 degree adjustment as well.
 

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Discussion Starter #18
Yea several ppl have said that but my question is will it always knock after that? or will it go away
 

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Yea several ppl have said that but my question is will it always knock after that? or will it go away
If you advance it 4 degrees and it knocks. The ECM SHOULD detect the knock and retard the timing.

What you can do is:
1. Advance it 4*
2. Do some WOT driving
3. Plug in the BDGT
4. Check what timing it shows at idle.


If it's not whatever the timing was when you set it at +4, say the original timing was 15, you advanced 4* but it now says that the timmng is 17* then the ecm has kicked in and has retarded the timing. So now you need to set your timing permanently at 17* or you need to run higher octane.

That's my take on it at least.
 

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with the hypertech and bullydog tuners with premium tune, they should advance the timing because you need 93+ octane when using the premium tune. question is how much. does anybody know?

chris
 
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