Forced Induction Timing Tables
Thread Starter
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Joined: Apr 2005
Posts: 1,546
From: Florence, Kentucky
Forced Induction Timing Tables
After extensive street tuning this is what I came up with. Anybody have anything drastically different? Anyone have more timing in the high rpm high map areas. Edit: Sorry I cant seem to make the Maps and Columns line up.
Main Spark Advance Vs. RPM Vs. MAP
RPM MAP (Kpa)
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
400 20.0 20.0 31.0 32.0 32.0 30.0 28.0 28.0 24.0 24.0 22.0 18.0 12.0 11.0 9.0 8.0
600 28.0 44.0 43.0 42.0 37.0 32.0 30.0 28.0 28.0 25.0 22.0 20.0 13.0 11.0 9.0 8.0
800 31.0 47.0 44.5 42.0 37.0 33.0 30.5 28.0 27.0 26.0 23.0 20.0 15.5 15.0 14.5 14.0
1000 36.0 49.0 45.5 42.0 39.0 36.0 34.0 32.0 30.0 28.0 24.5 23.0 18.5 18.0 17.0 16.0
1200 38.0 49.0 47.0 45.0 42.0 39.0 36.5 34.0 33.0 32.0 27.5 25.0 20.5 20.0 19.0 18.0
1400 39.0 49.0 47.0 45.0 43.0 41.0 39.5 38.0 36.0 34.0 30.5 28.0 23.0 22.0 21.0 20.0
1600 39.0 49.0 47.0 45.0 43.5 42.0 41.0 39.0 37.0 35.0 32.0 29.0 24.5 24.0 22.0 21.0
1800 39.0 49.0 47.0 45.0 44.0 43.0 41.0 40.0 38.0 36.0 34.0 32.0 26.0 24.0 24.0 24.0
2000 39.0 49.0 47.0 46.0 45.0 45.0 43.0 42.0 39.0 38.0 36.5 35.0 29.0 27.0 27.0 27.0
2200 39.0 49.0 48.0 47.0 45.5 45.0 43.5 42.0 40.0 39.0 37.5 36.0 30.5 33.0 33.0 32.0
2400 39.0 49.0 48.5 48.0 46.0 45.0 44.0 42.0 41.5 41.0 40.0 39.0 33.0 35.0 31.0 30.0
2800 39.0 49.0 49.0 49.0 47.5 46.0 44.5 43.0 42.0 41.0 40.5 40.0 35.0 37.0 32.0 31.0
3200 39.0 49.0 49.0 49.0 47.5 46.0 45.5 45.0 44.5 43.0 42.0 40.0 35.0 37.0 33.0 32.0
3600 35.0 45.0 45.0 45.0 45.0 45.0 45.0 45.0 43.5 42.0 40.0 36.0 35.0 37.0 31.0 31.0
4000 35.0 41.0 43.0 44.0 43.0 42.0 41.0 41.0 39.0 39.0 38.0 36.0 35.0 37.0 31.0 31.0
Extended Spark Advance Vs. RPM Vs. MAP
RPM MAP (Kpa)
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
4000 35.0 41.0 43.0 44.0 43.0 42.0 41.0 41.0 39.0 39.0 38.0 36.0 35.0 37.0 29.0 29.0
4500 35.0 41.0 44.0 44.0 43.0 42.0 41.0 40.0 40.0 40.0 39.0 36.0 35.0 37.0 28.0 28.0
5000 35.0 41.0 44.0 44.0 43.0 42.0 41.0 40.0 39.0 39.0 39.0 36.0 35.0 37.0 28.0 28.0
5500 35.0 40.0 44.0 44.0 43.0 42.0 41.0 40.0 39.0 39.0 39.0 36.0 35.0 37.0 27.0 27.0
6000 35.0 40.0 44.0 44.0 43.0 42.0 41.0 41.0 40.0 40.0 39.0 36.0 35.0 37.0 27.0 27.0
6500 35.0 40.0 44.0 44.0 43.0 42.0 41.0 41.0 41.0 41.0 39.0 38.0 37.0 39.0 27.0 27.0
7000 32.0 36.0 46.0 46.0 46.0 46.0 46.0 40.0 40.0 36.0 33.0 30.0 29.0 31.0 27.0 27.0
RPM MAP (Kpa)
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
400 20.0 20.0 31.0 32.0 32.0 30.0 28.0 28.0 24.0 24.0 22.0 18.0 12.0 11.0 9.0 8.0
600 28.0 44.0 43.0 42.0 37.0 32.0 30.0 28.0 28.0 25.0 22.0 20.0 13.0 11.0 9.0 8.0
800 31.0 47.0 44.5 42.0 37.0 33.0 30.5 28.0 27.0 26.0 23.0 20.0 15.5 15.0 14.5 14.0
1000 36.0 49.0 45.5 42.0 39.0 36.0 34.0 32.0 30.0 28.0 24.5 23.0 18.5 18.0 17.0 16.0
1200 38.0 49.0 47.0 45.0 42.0 39.0 36.5 34.0 33.0 32.0 27.5 25.0 20.5 20.0 19.0 18.0
1400 39.0 49.0 47.0 45.0 43.0 41.0 39.5 38.0 36.0 34.0 30.5 28.0 23.0 22.0 21.0 20.0
1600 39.0 49.0 47.0 45.0 43.5 42.0 41.0 39.0 37.0 35.0 32.0 29.0 24.5 24.0 22.0 21.0
1800 39.0 49.0 47.0 45.0 44.0 43.0 41.0 40.0 38.0 36.0 34.0 32.0 26.0 24.0 24.0 24.0
2000 39.0 49.0 47.0 46.0 45.0 45.0 43.0 42.0 39.0 38.0 36.5 35.0 29.0 27.0 27.0 27.0
2200 39.0 49.0 48.0 47.0 45.5 45.0 43.5 42.0 40.0 39.0 37.5 36.0 30.5 33.0 33.0 32.0
2400 39.0 49.0 48.5 48.0 46.0 45.0 44.0 42.0 41.5 41.0 40.0 39.0 33.0 35.0 31.0 30.0
2800 39.0 49.0 49.0 49.0 47.5 46.0 44.5 43.0 42.0 41.0 40.5 40.0 35.0 37.0 32.0 31.0
3200 39.0 49.0 49.0 49.0 47.5 46.0 45.5 45.0 44.5 43.0 42.0 40.0 35.0 37.0 33.0 32.0
3600 35.0 45.0 45.0 45.0 45.0 45.0 45.0 45.0 43.5 42.0 40.0 36.0 35.0 37.0 31.0 31.0
4000 35.0 41.0 43.0 44.0 43.0 42.0 41.0 41.0 39.0 39.0 38.0 36.0 35.0 37.0 31.0 31.0
Extended Spark Advance Vs. RPM Vs. MAP
RPM MAP (Kpa)
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
4000 35.0 41.0 43.0 44.0 43.0 42.0 41.0 41.0 39.0 39.0 38.0 36.0 35.0 37.0 29.0 29.0
4500 35.0 41.0 44.0 44.0 43.0 42.0 41.0 40.0 40.0 40.0 39.0 36.0 35.0 37.0 28.0 28.0
5000 35.0 41.0 44.0 44.0 43.0 42.0 41.0 40.0 39.0 39.0 39.0 36.0 35.0 37.0 28.0 28.0
5500 35.0 40.0 44.0 44.0 43.0 42.0 41.0 40.0 39.0 39.0 39.0 36.0 35.0 37.0 27.0 27.0
6000 35.0 40.0 44.0 44.0 43.0 42.0 41.0 41.0 40.0 40.0 39.0 36.0 35.0 37.0 27.0 27.0
6500 35.0 40.0 44.0 44.0 43.0 42.0 41.0 41.0 41.0 41.0 39.0 38.0 37.0 39.0 27.0 27.0
7000 32.0 36.0 46.0 46.0 46.0 46.0 46.0 40.0 40.0 36.0 33.0 30.0 29.0 31.0 27.0 27.0
Last edited by 97WS6Pilot; May 8, 2006 at 01:14 PM.
Thread Starter
Registered User
Joined: Apr 2005
Posts: 1,546
From: Florence, Kentucky
Re: Forced Induction Timing Tables
Thanks for the reply Rich. I'm not showing any knock retard. Now that one of the big HP guys has spoken don't be afraid to give your opinion.
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Joined: Feb 2000
Posts: 509
Re: Forced Induction Timing Tables
I agree with too much timing.
My 100 KPA readings are about 23-25* with slightly more timing in the other KPAs. Below 1200 RPM, my numbers are pretty stock. I try to have a smooth transition from different KPAs and RPMs. My 4800-5200 RPM miss is now gone, for which I attributed it to knock-retard kicking in. (after dissecting and replacing everything in the ignition path).
My 100 KPA readings are about 23-25* with slightly more timing in the other KPAs. Below 1200 RPM, my numbers are pretty stock. I try to have a smooth transition from different KPAs and RPMs. My 4800-5200 RPM miss is now gone, for which I attributed it to knock-retard kicking in. (after dissecting and replacing everything in the ignition path).
Last edited by Ultra_Dog; May 8, 2006 at 05:12 PM.
Thread Starter
Registered User
Joined: Apr 2005
Posts: 1,546
From: Florence, Kentucky
Re: Forced Induction Timing Tables
Originally Posted by Ultra_Dog
I agree with too much timing.
My 100 KPA readings are about 23-25* with slightly more timing in the other KPAs. Below 1200 RPM, my numbers are pretty stock. I try to have a smooth transition from different KPAs and RPMs. My 4800-5200 RPM miss is now gone, for which I attributed it to knock-retard kicking in. (after dissecting and replacing everything in the ignition path).
My 100 KPA readings are about 23-25* with slightly more timing in the other KPAs. Below 1200 RPM, my numbers are pretty stock. I try to have a smooth transition from different KPAs and RPMs. My 4800-5200 RPM miss is now gone, for which I attributed it to knock-retard kicking in. (after dissecting and replacing everything in the ignition path).
All I did was keep adding advance until I saw knock and then I backed it down 2 degrees. So it looks like I'm a little on the high side. My computer never sees the low MAP's because of my cam so I'm mainly concerned with 50KPA and above. Looks like I'm getting close to being ready for the dyno.
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Joined: Feb 2000
Posts: 509
Re: Forced Induction Timing Tables
I also noticed something in your tables:
If you notice in your Low RPM tables and referencing the 100 KPA values, you will see that your timing goes from 27*@2000, then climbs to 32*@ 3200 and steps down to 31* @ 4000. Now if you look at your High RPM table, you will see that you are running 29* @ 4000 and then step downward towards 27* @ 5500 to 7000.
I am unsure why the two tables show different reading for the same value (4000 RPM), but LT1 edit lets that error exist. I have no idea what happens. However, your timing is climbing, then falling, then climbing, then falling throughout the 100 KPA range.
I make sure that my 4000 RPM settings are identical on both High and Low RPM tables.
If you notice in your Low RPM tables and referencing the 100 KPA values, you will see that your timing goes from 27*@2000, then climbs to 32*@ 3200 and steps down to 31* @ 4000. Now if you look at your High RPM table, you will see that you are running 29* @ 4000 and then step downward towards 27* @ 5500 to 7000.
I am unsure why the two tables show different reading for the same value (4000 RPM), but LT1 edit lets that error exist. I have no idea what happens. However, your timing is climbing, then falling, then climbing, then falling throughout the 100 KPA range.
I make sure that my 4000 RPM settings are identical on both High and Low RPM tables.
Thread Starter
Registered User
Joined: Apr 2005
Posts: 1,546
From: Florence, Kentucky
Re: Forced Induction Timing Tables
Originally Posted by Ultra_Dog
I also noticed something in your tables:
If you notice in your Low RPM tables and referencing the 100 KPA values, you will see that your timing goes from 27*@2000, then climbs to 32*@ 3200 and steps down to 31* @ 4000. Now if you look at your High RPM table, you will see that you are running 29* @ 4000 and then step downward towards 27* @ 5500 to 7000.
I am unsure why the two tables show different reading for the same value (4000 RPM), but LT1 edit lets that error exist. I have no idea what happens. However, your timing is climbing, then falling, then climbing, then falling throughout the 100 KPA range.
I make sure that my 4000 RPM settings are identical on both High and Low RPM tables.
If you notice in your Low RPM tables and referencing the 100 KPA values, you will see that your timing goes from 27*@2000, then climbs to 32*@ 3200 and steps down to 31* @ 4000. Now if you look at your High RPM table, you will see that you are running 29* @ 4000 and then step downward towards 27* @ 5500 to 7000.
I am unsure why the two tables show different reading for the same value (4000 RPM), but LT1 edit lets that error exist. I have no idea what happens. However, your timing is climbing, then falling, then climbing, then falling throughout the 100 KPA range.
I make sure that my 4000 RPM settings are identical on both High and Low RPM tables.
Last edited by 97WS6Pilot; May 9, 2006 at 08:05 PM.
Thread Starter
Registered User
Joined: Apr 2005
Posts: 1,546
From: Florence, Kentucky
Re: Forced Induction Timing Tables
Originally Posted by Sean94Z
Seems a bit high to me too. I would get it on a dyno to make sure. You can make less power with more timing ...
How's your AFRs look?
How's your AFRs look?
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Joined: Feb 2001
Posts: 1,967
From: Bay Area, CA, USA
Re: Forced Induction Timing Tables
Hey Pilot, I don't know everything about tuning, but from what I see 11.8 is a big low is it not? I have not perfected my WOT tune yet but my A/F ratio is constant between 11.8-12.0 across the board. I really feel that the car can go a little leaner than that while still being safe. However, it seems that your tune has sacrificed some a/f ratio for some extra timing. When PCMforless had my WOT timing a little high (something like 32* until 4000 when it dropped back to 26* abruptly), the instant I hit 2800 rpm at wot I got 7* of knock. After I shifted, my rpms never went below 3500-4000 range where my timing was good at 26 or 27* and no more knock. Now the problem is fixed, but my car absolutely did not like the low-thirties timing. Have you tried lowering the timing and leaning it out a little bit and seeing how it runs??
Wow I just looked at the rest of the table... is it common to add so much timing across the board??? I mean you are running 4-5* more than stock across the whole table. Any reason for doing that, I'm curious how mine would respond? Does the lower compression have an effect on that? My timing table is mostly stock with 1 or 2* taken out in the cruise range in an attempt to make it a little smooth (less of course the 95-100 kPa range).
Wow I just looked at the rest of the table... is it common to add so much timing across the board??? I mean you are running 4-5* more than stock across the whole table. Any reason for doing that, I'm curious how mine would respond? Does the lower compression have an effect on that? My timing table is mostly stock with 1 or 2* taken out in the cruise range in an attempt to make it a little smooth (less of course the 95-100 kPa range).
Thread Starter
Registered User
Joined: Apr 2005
Posts: 1,546
From: Florence, Kentucky
Re: Forced Induction Timing Tables
Originally Posted by 96 WS6
Hey Pilot, I don't know everything about tuning, but from what I see 11.8 is a big low is it not? I have not perfected my WOT tune yet but my A/F ratio is constant between 11.8-12.0 across the board. I really feel that the car can go a little leaner than that while still being safe. However, it seems that your tune has sacrificed some a/f ratio for some extra timing. When PCMforless had my WOT timing a little high (something like 32* until 4000 when it dropped back to 26* abruptly), the instant I hit 2800 rpm at wot I got 7* of knock. After I shifted, my rpms never went below 3500-4000 range where my timing was good at 26 or 27* and no more knock. Now the problem is fixed, but my car absolutely did not like the low-thirties timing. Have you tried lowering the timing and leaning it out a little bit and seeing how it runs??
Wow I just looked at the rest of the table... is it common to add so much timing across the board??? I mean you are running 4-5* more than stock across the whole table. Any reason for doing that, I'm curious how mine would respond? Does the lower compression have an effect on that? My timing table is mostly stock with 1 or 2* taken out in the cruise range in an attempt to make it a little smooth (less of course the 95-100 kPa range).
Wow I just looked at the rest of the table... is it common to add so much timing across the board??? I mean you are running 4-5* more than stock across the whole table. Any reason for doing that, I'm curious how mine would respond? Does the lower compression have an effect on that? My timing table is mostly stock with 1 or 2* taken out in the cruise range in an attempt to make it a little smooth (less of course the 95-100 kPa range).
My P1SC only makes about 4 psi at 3000 so I can go pretty high on the timing there.
I chose 11.8 because I make good power anywhere from 11.0 to 12.5 and I wanted to have room for error in case of temperature and density changes.
I may give your suggestion a try when I get on the dyno.