Pull timing for nitrous
#2
Safety Car
Easiest way is the IAT trick. Easy to setup and works all the time
Last edited by JoeyG; 07-09-2018 at 05:45 PM.
#3
Burning Brakes
Thread Starter
#4
Safety Car
#5
Safety Car
in the old files and posts. Its a little messier than the Lingenfelter box,but alot cheaper. Basically you arm the nitrous, a relay energizes causing the iat to go to an abnormal out of rage value or a higher temp and pull timing until the nitrous system is deactivated.
#6
Le Mans Master
J&S Interceptor. I didn't pull any timing. Ran up to a 275 shot (2 kits) on 93 pump gas in my Cobra on top of 18 psi from twin 57mm turbos all at 56 degrees of timing. The thing flat out works. Soon installing in my ZO6 for a 100-175 shot on pump gas. J&S is far superior to the factory detonation control via the PCM and knock sensors.
Last edited by Pb82 Ronin; 07-10-2018 at 10:06 AM.
#7
Safety Car
J&S Interceptor. I didn't pull any timing. Ran up to a 275 shot (2 kits) on 93 pump gas in my Cobra on top of 18 psi from twin 57mm turbos all at 56 degrees of timing. The thing flat out works. Soon installing in my ZO6 for a 100-175 shot on pump gas. J&S is far superior to the factory detonation control via the PCM and knock sensors.
#8
Le Mans Master
#10
Le Mans Master
YESSIR! On spray AND boost AND pump gas. NO RETARD AT ALL!
EDIT: That's how the J&S works. It allows the tuner to "see" ACTUAL knock in the cylinder. But it doesn't globally retard timing like the GM (or Ford in my previous example) logic does. It pulls timing ONLY to the cylinder pinging and slowly (by slowly, I mean 2 deg per every 720 deg rotation of the crankshaft until the next detected ping) returns timing to normal. If it was a "freak" ping then it's full timing restored and business as usual. If it hears another "ping," it retards and maintains 1 deg of timing below the "ping" threshold and holds there for a time variable...approx. 3 seconds IIRC, then the cycle starts all over again. The reason this is a big deal is because in lamens terms, a tuner can tune ANY combination right up to the ragged edge of detonation and provide a 10/20 deg safety net (adjustable by switch). In more basic terms, you can get the MAXIMUM SAFE power out of any combo. NEVER hurt your motor. Pretty sweet if you have 15-20K in a motor. No tuner would've put 56* in my Cobra on a hunch or guess. We played in the 28-32* range for years before the J&S. I would retard 4* while spraying, yadda yadda. The J&S SHOWED us that we were nowhere close to pinging. So we went up 5* a pull (while street tuning) until we reached 58*!!! At 58* we finally saw knock in multiple cylinders (on boost only). Backed it down to 56* and left it for YEARS! While spraying such a huge shot, I never saw anything but trace knock on the initial hit. All this due to the J&S. Worth EVERY PENNY! Think about it this way...the FIRST time it activates, it just paid for itself by saving your engine.
EDIT: That's how the J&S works. It allows the tuner to "see" ACTUAL knock in the cylinder. But it doesn't globally retard timing like the GM (or Ford in my previous example) logic does. It pulls timing ONLY to the cylinder pinging and slowly (by slowly, I mean 2 deg per every 720 deg rotation of the crankshaft until the next detected ping) returns timing to normal. If it was a "freak" ping then it's full timing restored and business as usual. If it hears another "ping," it retards and maintains 1 deg of timing below the "ping" threshold and holds there for a time variable...approx. 3 seconds IIRC, then the cycle starts all over again. The reason this is a big deal is because in lamens terms, a tuner can tune ANY combination right up to the ragged edge of detonation and provide a 10/20 deg safety net (adjustable by switch). In more basic terms, you can get the MAXIMUM SAFE power out of any combo. NEVER hurt your motor. Pretty sweet if you have 15-20K in a motor. No tuner would've put 56* in my Cobra on a hunch or guess. We played in the 28-32* range for years before the J&S. I would retard 4* while spraying, yadda yadda. The J&S SHOWED us that we were nowhere close to pinging. So we went up 5* a pull (while street tuning) until we reached 58*!!! At 58* we finally saw knock in multiple cylinders (on boost only). Backed it down to 56* and left it for YEARS! While spraying such a huge shot, I never saw anything but trace knock on the initial hit. All this due to the J&S. Worth EVERY PENNY! Think about it this way...the FIRST time it activates, it just paid for itself by saving your engine.
Last edited by Pb82 Ronin; 07-10-2018 at 07:34 PM.
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StatmanRN (07-10-2018)
#11
Drifting
untill it forgets to wake up one day?
anyway, what did you do to the engine that it needs that much timing? i had a prv engine that needed 32° at 1.6 bars, but 56°?
anyway, what did you do to the engine that it needs that much timing? i had a prv engine that needed 32° at 1.6 bars, but 56°?
#13
Le Mans Master
That's a risk with EVERY piece of aftermarket gear. But 6 years on the car, it never failed me once. It was lower-ish CR at 9.28:1 and it's a 4V motor with advanced intake cams. Not that it really explains WHY my motor could take so much timing...but the point is, we would've never found the knock threshold without the J&S.
Last edited by Pb82 Ronin; 07-12-2018 at 07:08 AM.
#14
Le Mans Master
Just because it CAN take that much timing doesn't mean it's making any extra power WITH that timing.
I use an IAT tricker and modified the tune for it. I have it set to show a negative temperature so that the computer actually adds a little fuel instead of having it show a hot temperature and the computer pull fuel..
I use an IAT tricker and modified the tune for it. I have it set to show a negative temperature so that the computer actually adds a little fuel instead of having it show a hot temperature and the computer pull fuel..
#15
Le Mans Master
Just because it CAN take that much timing doesn't mean it's making any extra power WITH that timing.
I use an IAT tricker and modified the tune for it. I have it set to show a negative temperature so that the computer actually adds a little fuel instead of having it show a hot temperature and the computer pull fuel..
I use an IAT tricker and modified the tune for it. I have it set to show a negative temperature so that the computer actually adds a little fuel instead of having it show a hot temperature and the computer pull fuel..
#16
Burning Brakes
Thread Starter
Just because it CAN take that much timing doesn't mean it's making any extra power WITH that timing.
I use an IAT tricker and modified the tune for it. I have it set to show a negative temperature so that the computer actually adds a little fuel instead of having it show a hot temperature and the computer pull fuel..
I use an IAT tricker and modified the tune for it. I have it set to show a negative temperature so that the computer actually adds a little fuel instead of having it show a hot temperature and the computer pull fuel..
What does your setup look like ot trick the IAT?
#17
Drifting
EFILive Custom OS 5 has the option to pull/add fuel and pull timing using a spare PCM pin.
#18
Safety Car