When to retard timing with a nitrous system

[12secondv6]

Any time you increase cylinder pressure, power increases and ignition timing needs to be re evaluated.
Nitrous creates a much quicker burn rate in the cylinder so it is always best to retard the timing to compensate.
Greater nitrous loads require less total timing.
But when to reduce?????

Hp Increase (aka shot level) Timing Retard
up to 100 0-2 degrees
101-150 2 degrees
151-200 4 degrees
201-325 6 degrees
326+ :eek: 8 degrees

I've seen the question asked here and there so I thought I would post some info on it

[John_D.]

<blockquote>quote:</font><hr>Originally posted by 12secondv6:

101-150 2 degrees
<hr></blockquote>

Thanks for the info!

Did you have to retard your timing when you ran a 120 dry shot...?

When I get my maf issues ironed out, I'm thinking about this next level. :cool:

[12secondv6]

Bone stock timing w/ 120 dry and 100 wet

[rob231]

james you are sooooo retarded!!! weeeeeeee! :D

[OnixV6]

<blockquote>quote:</font><hr>Originally posted by 12secondv6:
Any time you increase cylinder pressure, power increases and ignition timing needs to be re evaluated.
Nitrous creates a much quicker burn rate in the cylinder so it is always best to retard the timing to compensate.
Greater nitrous loads require less total timing.
But when to reduce?????

Hp Increase (aka shot level) Timing Retard
up to 100 0-2 degrees
101-150 2 degrees
151-200 4 degrees
201-325 6 degrees
326+ :eek: 8 degrees

I've seen the question asked here and there so I thought I would post some info on it<hr></blockquote>

James, do these numbers apply to both wet and dry shots? or should there be different numbers for wet and dry?

[12secondv6]

Wet and dry for the timing retarding

[Magnus]

I think timing should be retarted even more.

On my 12.3 pass the autotap log showed around 12 degrees of KR or so and a total timing advance of 13. 13 degrees of timing advance all the way down the track opposed to the 30 I try to push NA.

I think the tables should look more like this:

000-100 4 degrees
101-150 6 degrees
151-200 8 degrees

Combustion happens so fast on nitrous you don't need to pre-ignite the mixture so soon...

At least that what I think. *shrug*

- Keith

[12secondv6]

Well I posted a rough figure.
You did it right, ran the car, and got feedback from it.
I still haven't scanned my bird when I'm juicing so I dunno.
I will have to do that one of these days.
Hmmmm, see, you always get me thinking :D

[pgriffith]

I have been told to retard timing 2 deg.* for every 50 HP, so 75 would be retard 3*, 100=4* 200=8* etc.....

Is this not correct?

I read this on the net somewhere, I cant remember the site. I tried finding it but failed. This method looks pretty close to what magnus has said above.

[ July 22, 2002: Message edited by: pgriffith ]</p>