Nitrous and ignition retard

OpenFlash · 03-21-2010, 02:40 PM

Something to read about before even thinking about running nitrous:

And no, running methanol and race gas does NOT provide enough knock suppression when running 12-13psi with a .32 nitrous nozzle. At the drag strip, I saw knock retard running 110 octane and TWO M7 meth jets (running 75/25 mix) on a 75F day with IATs under 20deg C. And I have logs to prove it.

Any tuner who says that meth and/or race gas is "enough" to ignore any form of active n2o triggered ignition retard is lying to you.

Ridiculous.

Shiv

JoeyFiasco · 03-21-2010, 03:19 PM

from http://www.nitrousdirect.com/faq.html

5. How can I achieve even higher horse power gains and what are some general rules to follow?

A: Generally, retarding ignition timing by 4-8 degrees (1 to 1-1/2 degrees timing retard per 50 HP gain). Forged pistons to increase reliability. In many cases a high performance fuel pump may be necessary. Higher octane (100+) racing fuel may be required as well as spark plugs 1 to 2 heat ranges colder than normal with gaps closed to .025"-.030". For gains over 275 HP, other significant modifications could be necessary. These modifications allow for even higher HP and include a forged crankshaft, forged connecting rods, a dedicated high output fuel pump used to supply the additional fuel demands of the nitrous system, and a quality racing fuel with high specific gravity and an octane rating of 110 or more.

9. Does nitrous oxide cause detonation?

A: Not directly. Detonation can be the result of many things, such as a lean condition caused by not adding enough fuel, too low of an octane of fuel, and tmustoo much ignition advance. Most of our kits work well with stock type engines running on premium type fuels and minimal decreases of ignition timing. In racing application where higher compression ratios are used, a higher fuel octane be used as well as more ignition retard.

15. Can you apply Nitrous Oxide to high compression engines?

A: Absolutely. High compression ratios work well with nitrous oxide provided the proper balance of nitrous and fuel enrichment is maintained. Generally, the higher the compression ratio, the more ignition retard, as well as higher octane fuel, is required.

03-21-2010, 02:40 PM	#1
OpenFlash 1809 Rep 17,960 Posts Drives: A Lot Join Date: Sep 2006 Location: SF Bay, CA iTrader: (0) Garage List 2018 Ducati Panigal ... [0.00] 2016 Mazda CX5 [0.00] 2017 Aprilia Tuono ... [0.00] 2019 BMW M2 Competi ... [0.00] 2015 BMW M5 Competi ... [10.00] 2016 Ducati XDiavel S [0.00] 2016 AMG GT S [0.00] 2011 Ferrari 458 It ... [0.00] 2017 Charger Hellcat [0.00] 2015 KTM Super Duke ... [0.00] 2016 KTM RC390 [0.00]	Nitrous and ignition retard Something to read about before even thinking about running nitrous: And no, running methanol and race gas does NOT provide enough knock suppression when running 12-13psi with a .32 nitrous nozzle. At the drag strip, I saw knock retard running 110 octane and TWO M7 meth jets (running 75/25 mix) on a 75F day with IATs under 20deg C. And I have logs to prove it. Any tuner who says that meth and/or race gas is "enough" to ignore any form of active n2o triggered ignition retard is lying to you. Ridiculous. Shiv Last edited by OpenFlash; 03-21-2010 at 03:03 PM..
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03-21-2010, 03:19 PM	#2
JoeyFiasco Major 26 Rep 1,211 Posts Drives: '09 Coupe Join Date: Aug 2008 Location: P'boro, UK iTrader: (0)	some of the highlights.. from http://www.nitrousdirect.com/faq.html 5. How can I achieve even higher horse power gains and what are some general rules to follow? A: Generally, retarding ignition timing by 4-8 degrees (1 to 1-1/2 degrees timing retard per 50 HP gain). Forged pistons to increase reliability. In many cases a high performance fuel pump may be necessary. Higher octane (100+) racing fuel may be required as well as spark plugs 1 to 2 heat ranges colder than normal with gaps closed to .025"-.030". For gains over 275 HP, other significant modifications could be necessary. These modifications allow for even higher HP and include a forged crankshaft, forged connecting rods, a dedicated high output fuel pump used to supply the additional fuel demands of the nitrous system, and a quality racing fuel with high specific gravity and an octane rating of 110 or more. 9. Does nitrous oxide cause detonation? A: Not directly. Detonation can be the result of many things, such as a lean condition caused by not adding enough fuel, too low of an octane of fuel, and tmustoo much ignition advance. Most of our kits work well with stock type engines running on premium type fuels and minimal decreases of ignition timing. In racing application where higher compression ratios are used, a higher fuel octane be used as well as more ignition retard. 15. Can you apply Nitrous Oxide to high compression engines? A: Absolutely. High compression ratios work well with nitrous oxide provided the proper balance of nitrous and fuel enrichment is maintained. Generally, the higher the compression ratio, the more ignition retard, as well as higher octane fuel, is required.
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