91 octane with predator....problems!

menasci

Member

Aug 17, 2003

640

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Chandler, AZ

Jan 27, 2006

#1

• Jan 27, 2006

• #1

Just got the Diablo Predator.
I can only get 91 octane fuel here in Phoenix.
I installed the "performance" tune and the car feels stronger, but it's pinging at WOT.
The directions say to retard the timing 10% if using 91 octane.
Well, it's tough to figure out how much the timing was advanced, thus making very difficult to figure how much 10% would be.
Anyone know what I should set this to?

 

jrc_03_gt

New Member

Jan 1, 2004

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Jan 27, 2006

#2

• Jan 27, 2006

• #2

maybe octane booster would help? You can add it to your tank of gas each time. I dont know expensive it is though. Or just keep backing off the spark till it stops pinging. I run 94 in mine.

 

trailblazr81

Member

May 17, 2003

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Hollister, Cali

Jan 27, 2006

#3

• Jan 27, 2006

• #3

You can adjust the tune on the predator. Theres adjustments for timing at lower RPM and upper RPM. Simple +/- adjustments. Just lower it a tad n see if your pinging stops. I only have crappy Cali 91 octane and I have my timing at max.

 

S

sbelyo

Member

Jun 10, 2005

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Jan 27, 2006

#4

• Jan 27, 2006

• #4

When using 91 octane I had to reduce the spark advance. About two clicks past the middle. If it still pings, reduce it by one more click to the left. Also try changing your PCV if you haven't changed it in a while.

When using 93 (My octane of choice) I can max out the spark advance. I saw no benefit when switching to 94.

 

propellerhead

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Apr 13, 2004

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"but what's with the but shots?"

Jan 27, 2006

#5

• Jan 27, 2006

• #5

menasci said:

Just got the Diablo Predator.
I can only get 91 octane fuel here in Phoenix.
I installed the "performance" tune and the car feels stronger, but it's pinging at WOT.
The directions say to retard the timing 10% if using 91 octane.
Well, it's tough to figure out how much the timing was advanced, thus making very difficult to figure how much 10% would be.
Anyone know what I should set this to?

Click to expand...

Math is not required. Fire up the Predator and get to the Timing Advance screen. Click to the left till you see 10. The scale shown is %.

 

menasci

Member

Aug 17, 2003

640

1

16

Chandler, AZ

Jan 27, 2006

#6

• Jan 27, 2006

• #6

So is each little "click" is a percentage or a degree?
I backed it off 3 clicks and it seemed to help.
Also, I think my exhaust sounds louder and gurggles more with the tune.
Anyone exerience this, or am I just nuts?

 

K

Kilgore Trout

Fried or Broiled ?

10 Year Member

Mar 30, 2005

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Jan 27, 2006

#7

• Jan 27, 2006

• #7

Octane boost will not help, that stuff is worthless

Since the air is so hot in Phoenix you are going to get detonation at WOT if you try to advance timing much at all. You should adjust it as stated in the above replies.

Heat and insufficient octane are both major contributing factors to detonaton. Detonation is one of the things that can really kill your 4.6 engine.

 

propellerhead

New Member

Apr 13, 2004

1,541

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"but what's with the but shots?"

Jan 27, 2006

#8

• Jan 27, 2006

• #8

menasci said:

So is each little "click" is a percentage or a degree?
I backed it off 3 clicks and it seemed to help.
Also, I think my exhaust sounds louder and gurggles more with the tune.
Anyone exerience this, or am I just nuts?

Click to expand...

Percent.

 

menasci

Member

Aug 17, 2003

640

1

16

Chandler, AZ

Jan 28, 2006

#9

• Jan 28, 2006

• #9

propellerhead said:

Percent.

Click to expand...

Thanks

 

menasci

Member

Aug 17, 2003

640

1

16

Chandler, AZ

Jan 28, 2006

#10

• Jan 28, 2006

• #10

Kilgore Trout said:

Octane boost will not help, that stuff is worthless

Since the air is so hot in Phoenix you are going to get detonation at WOT if you try to advance timing much at all. You should adjust it as stated in the above replies.

Heat and insufficient octane are both major contributing factors to detonaton. Detonation is one of the things that can really kill your 4.6 engine.

Click to expand...

well it is winter time

 

K

Kilgore Trout

Fried or Broiled ?

10 Year Member

Mar 30, 2005

4,749

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Jan 28, 2006

#11

• Jan 28, 2006

• #11

menasci said:

well it is winter time

Click to expand...

Thanks for reminding me

Reduce your timing...