Stikya

iTrader: (1)

SAE #

Naturally aspirated
181 HP
173 Torque

65 Zex Shot
219 HP
233 Torque

I was running just slightly lean (A/F: 12.3-13); but I expected more increase.

Was I just expecting too much, or are my N20 numbers low?

SkylineGTR

ZEX is known for not making big numbers at the wheels, and sadly, its true, several people have done dynos with ZEX vs NX or NOS and its shown that ZEX seems to put down much smaller numbers than an equivalent shot of NX or NOS. Also if u dont have a bottle heater, get that too, cuz itll keep ur shot consistent and bring the power at the wheels closer to the shot, like a NX 75shot without heater made like 50something at teh wheels while with the heater it made 76 at the wheels.

SkylineGTR

BTW, is your car auto?

Stikya

iTrader: (1)

Yea, auto. But, it's 100 degrees where I am; I would expect a bottle heater to not make much diffence right now.

2K2_6spd

iTrader: (1)

12.5-13.0 is not lean, it is perfect, 13.5-14.0 is considered optimal for N/A, but anywhere in the 12's is perfect for nitrous.

SkylineGTR

Bottle pressure drops as u spray bc it gets colder, but im not the expert on that, all i know is that on an auto with 50shot, bottle heater is what lets u break ur tires loose in 1st gear. Someone i know runs a 50shot with bottle heater and when his nitrous sprays its enough to break loose his tires in 1st gear, i run a 60shot on mine and no wheel spin, he also has heavier rims.