View Full Version : pulling timing choices


zooguy
03-24-2012, 05:49 PM
i know i am going to be getting a full dyno tune for my car before i ever spray on it. I had a question about pulling timing out of the tune.
Once i find were the car likes to make power with the tune by checking the plugs after each pull and i have all the timing pulled out ... (100 shot so 4-5* of timing) how much power will the car lack driving around N/A off the bottle.

please correct my thinking if i am wrong but.

driving around in close loop the car gets better MPG by reading off the O2 sensors. Then under WOT it goes back in to open loop where the tuners adjust things to make better power. if my thought process is right normal easy driving i should not notice any timing coming out of the car but only while under WOT conditions and not spraying nitrous.

i know timing needs to be pulled but i dont want to have the feeling that i have lost 40+ hp if i am not on the bottle and driving easy. i know a timing retard box fixes that issue but that is just one more thing that costs $$$, has to be wired up, and could fail.










































and GO!!!

98LS1driver
03-24-2012, 08:35 PM
I would like to know the same as well

David Q
03-24-2012, 09:22 PM
My setup with 8 degrees pulled only lost 19 peak hp. I can barely tell a difference.

1lejohn
03-24-2012, 10:14 PM
With 6 degrees pulled timing at 24 the car does not drive on the street as well with the timing back in. I have run as much as 32 degrees on the street and NA at the track. The car just idels better and doesn't load up with the timing in.

SargeZ06
03-24-2012, 10:18 PM
Resistor Mod. FTW!

zooguy
03-25-2012, 01:27 PM
so will i feel a loss under part throttle conditions with the nitrous tune and no nitrous being sprayed?

SargeZ06
03-25-2012, 03:13 PM
If you use the resistor mod you can have it wired to a relay that is only triggered when the nitrous is armed or sprayed. If you need a lot of timing pulled than a resistor alone will do, then you can set that amount in your tune under the IAT timing adder table also. I pull 9 degrees.

F0x Slaughter
03-25-2012, 03:41 PM
i know i am going to be getting a full dyno tune for my car before i ever spray on it. I had a question about pulling timing out of the tune.
Once i find were the car likes to make power with the tune by checking the plugs after each pull and i have all the timing pulled out ... (100 shot so 4-5* of timing) how much power will the car lack driving around N/A off the bottle.

please correct my thinking if i am wrong but.

driving around in close loop the car gets better MPG by reading off the O2 sensors. Then under WOT it goes back in to open loop where the tuners adjust things to make better power. if my thought process is right normal easy driving i should not notice any timing coming out of the car but only while under WOT conditions and not spraying nitrous.

i know timing needs to be pulled but i dont want to have the feeling that i have lost 40+ hp if i am not on the bottle and driving easy. i know a timing retard box fixes that issue but that is just one more thing that costs $$$, has to be wired up, and could fail.

Use and ignition box so when you activate the nitrous it pulls timing.

You can alter closed loop tuning too. You either run speed density which uses the VE tables for fueling, if you tune in MAF you alter the MAF readings. Do it right. Get a box.

WOT just commands the AFR from two tables that through a calculation tells the PCM what to do.

zooguy
03-25-2012, 04:34 PM
yeah i am not even considering the "resistor mod" i am just trying to chose to pull it out of the tune v. getting a box


BTW my car is a 95 so it has the "obd 1.5 crap"

F0x Slaughter
03-25-2012, 04:40 PM
Mine is also a 95Z. I have been tuning it for the past 2 days.

I would use a box even though I can tune the PCM myself.

sweet99ss
03-25-2012, 08:18 PM
Lingenfelter timing/launch control box! I love mine. It litterally is soooo simple to install. Took about 10 mins tops! They have all there wires with connectors already on them so you don't have to do anything, but plug the wires together!

zooguy
03-25-2012, 09:03 PM
that is for the LS based cars only

sweet99ss
03-25-2012, 11:49 PM
And what do you have?

zooguy
03-26-2012, 06:40 AM
BTW my car is a 95 so it has the "obd 1.5 crap"


1995 LT1 sorry i should have been more clear

F0x Slaughter
03-26-2012, 04:21 PM
As I said I've been tuning my 95Z over this past weekend and I would still use a box to pull timing. What I've seen is every degree of timing pulled is roughly 2 horsepower. So you pull out 6 degrees of timing across the board thats 12 horsepower.

My6speedZ
03-26-2012, 05:17 PM
With the IAT tricker mod doesn't that add fuel as well when it's activated? I'm probably just going to end up pulling the timing out and loosing some N/A power. My main concern is if it will alter the driveablity sorry for the :hijack:

F0x Slaughter
03-26-2012, 09:17 PM
A resister on the IAT sensor does one of two things, either tells the sensor the temperature is hotter (less oxygen available) so it removes fuel. If it thinks its cooler, it adds more fuel (more oxygen).

Pulling say 6 degrees of timing isn't going to really ruin drive ability but the problem is going to be without a lower timing the mixture won't have enough time to completely burn. Thats what timing does, changes the time the spark ignites so it gives the fuel the best chance of fully burning. So it will be rich, it will probably back fire in the exhaust due to the fuel igniting in the exhaust system.

Spend the 200 bucks and get yourself a box. Its just the best way to do it. Why do you think people spend the money on the box?

I run as high as 44* of timing and have no spark retard.

Highest I run at WOT is 33*.

MyFirst01
03-27-2012, 09:08 AM
I pulled 4* total and the car doesn't drive that great around town. I haven't switched to the br7efs yet, but i'm pretty sure the timing pulled is causing piston slap because every time I turn the car on, It sounds like the engine is about to fall apart.

I'm not sure if the pulled timing is causing the piston slap though. But if i'm wot, the car performs normally. Not sure what the deal is but I have been trying to get to the bottom of it.

F0x Slaughter
03-27-2012, 08:05 PM
Pulling timing will not cause piston slap. To much timing will cause detonation.