how much nitrous if any on 27* timing
09-01-2012, 08:35 PM
#1
TECH Apprentice
Thread Starter
iTrader: (3)
Join Date: May 2011
Location: kansas city,mo
Posts: 338
Likes: 0
Received 0 Likes
on
0 Posts
how much nitrous if any on 27* timing hey guys new to nitrous world so got a question.... ok, my tuner said timing is at 27*. my question is that okay to do a small 50 shot on? i cant seem to find what factory timing is but he did say on a 125 shot to pull 5 deg so i assume 27 is close to stock? im waiting to buy a lnc to pull timing but there is a big meet next sat so if i can i would like to spray a little if need be. i got br7ef plugs so im good there. gonna end up w/ a 175-200 once i get the timing puller. thanks
09-01-2012, 08:38 PM
#2
I wouldn't do it, but it's your call and your car.
With C16 I wouldn't be afraid of those timing numbers on a 50-100 shot, but without knowing what the plugs look like on a lesser amount of timing you would never know if it actually ran better on less timing than it would on 27*.
A lot of times nitrous likes less timing and less fuel instead of more timing and more fuel. What does your AFR look like on motor?
With C16 I wouldn't be afraid of those timing numbers on a 50-100 shot, but without knowing what the plugs look like on a lesser amount of timing you would never know if it actually ran better on less timing than it would on 27*.
A lot of times nitrous likes less timing and less fuel instead of more timing and more fuel. What does your AFR look like on motor?
09-01-2012, 08:55 PM
#3
TECH Apprentice
Thread Starter
iTrader: (3)
Join Date: May 2011
Location: kansas city,mo
Posts: 338
Likes: 0
Received 0 Likes
on
0 Posts
to be honest i dont know,was late to get my kids from school when i picked it up so didnt talk much. he said everything was good though. got a new wideband im hooking up this week so will know soon. what was stock timing?
Trending Topics
09-04-2012, 11:54 AM
#13
LS1Tech Sponsor
NA timing Peak power naturally aspirated timing will depend a lot on cylinder head type along with other engine build related variables. If you can run at that timing will also depend on fuel type and compression ratio. Most OEM LSx type heads tend to make peak power in the 24-28 degrees of timing range so you are probably pretty close to peak power timing so you probably don't have a lot of safety margin for running nitrous on that combination.
Stock LS1 engines run around 26 degrees of timing at peak power. Stock LS6 engines run around 24 degrees of timing at peak power. Stock LS2 and LS3 engines are around the same. Stock LS7 engines tend to run peak power in the 26-28 degree of timing range. The LSA/LS9 engines, with the swirl generators in the intake runner, run around 28 degrees of timing at peak power (with a supercharger).
When looking at the stock timing tables in the different tuning software programs, be careful that many other adders and subtractors (and multipliers) exist so the main spark table will often not be the end result. For example in most applications GM has PE (power enrichment) spark that is based on the AFR and the RPM. On an LS7 engine they are adding around 5 degrees of timing at 6000 RPM in the PE spark table. On a LS2 they are adding 2 degrees at 6000 RPM. The best is to actually look at a data log from a running vehicle. You can even log all the different adders to see what is adding/taking away.
If this was an older BBC engine that wanted 34 to 42 degrees of timing for peak power then 27 degrees would probably be a fairly conservative spark timing for nitrous. 8-)
Stock LS1 engines run around 26 degrees of timing at peak power. Stock LS6 engines run around 24 degrees of timing at peak power. Stock LS2 and LS3 engines are around the same. Stock LS7 engines tend to run peak power in the 26-28 degree of timing range. The LSA/LS9 engines, with the swirl generators in the intake runner, run around 28 degrees of timing at peak power (with a supercharger).
When looking at the stock timing tables in the different tuning software programs, be careful that many other adders and subtractors (and multipliers) exist so the main spark table will often not be the end result. For example in most applications GM has PE (power enrichment) spark that is based on the AFR and the RPM. On an LS7 engine they are adding around 5 degrees of timing at 6000 RPM in the PE spark table. On a LS2 they are adding 2 degrees at 6000 RPM. The best is to actually look at a data log from a running vehicle. You can even log all the different adders to see what is adding/taking away.
If this was an older BBC engine that wanted 34 to 42 degrees of timing for peak power then 27 degrees would probably be a fairly conservative spark timing for nitrous. 8-)
hey guys new to nitrous world so got a question.... ok, my tuner said timing is at 27*. my question is that okay to do a small 50 shot on? i cant seem to find what factory timing is but he did say on a 125 shot to pull 5 deg so i assume 27 is close to stock? im waiting to buy a lnc to pull timing but there is a big meet next sat so if i can i would like to spray a little if need be. i got br7ef plugs so im good there. gonna end up w/ a 175-200 once i get the timing puller. thanks
11-30-2012, 07:18 PM
#14
TECH Apprentice
Join Date: Jan 2008
Location: Gladstone, Queensland, Australia
Posts: 366
Likes: 0
Received 0 Likes
on
0 Posts
the chambers are efficient...to much timing = negative torque and slower mph. Always start from low numbers and work up until you find what it likes. Negative torque is the piston trying to push the crank in reverse from to much timing the momentum of the crank keeps it spinning to much timing will put energy into hurting torque, not increasing it. Find the happy medium, power will come from the right mixtures.
12-01-2012, 09:20 AM
#15
Launching!
iTrader: (2)
Join Date: Aug 2012
Location: pikeville , ky
Posts: 270
Likes: 0
Received 0 Likes
on
0 Posts
not sayin to do this, i have a ls3 . but i did the same thing and ran a 50 shot. but i did a few lil hits to test it out and check the plugs. run some race fuel too. race fuel should cover a 50 shot. but by no means does this mean its ok to do. every car is diff.
