im in toronto canada and i streetrace. im hittin 11.9 with h22a and 75 zex shot in my 93 civic coupe si on street tire.
i want to go with a higher zex pill maybe 100 or 125 is this safe?

 

You should be good for a 100 shot. Thats pretty good on street tires. Any thing else done to the motor?

 

Whatever you do, don't go above a 75 shot with the zex kit. Once you go over a 75 shot, you need direct port, so each intake runner has its own fogger nozzle spraying nitrous AND fuel. Over a 75 shot with a dry kit or a single fogger wet you run into big distribution problems....it doesn't spread evenly to all the cylinders and is very easy to run way lean in one cylinder. Not to mention Zex doesn't make jets over a 75 shot for honda/acura, and the jets for the mustang kit wouldn't be right. Also for a 100 shot you'll need a higher flow fuel pump, and an aftermarket ignition, and more tuning.

 

hey thanks for the quick reply. i had a guy call zex and they are sendin 4 jets from the states. two bigger fuel and two spray. i thought they didnt have them either but what do i know. i do have a 255 inline and full msd ignition. you think if i put 500cc venom injectors in it would help? i need a bigger kick cause dave natelli beat me by 10 feet in the quarter.

 

ya ive done some other stuff. the car weighs 1900 pounds enough said. i have 2.5 exhaust no cat. 255 fuel pump, fuel cell, full msd ignition, zex plugs, modified p13 ecu, header, intake, nology wires, m2b4 lsd tranny. anything else you think i should have let me know.

 

Well if it was me, I wouldn't be spraying 100 shot dry. I'm not saying it can't be done, but it's not the greatest way of doing it. While you're at it, ditch those Zex plugs for some NGK coppers, 2 heat ranges colder than stock. Zex plugs are terrible, I had them. I'm thinking bigger injectors than stock would help out to flow more fuel, you might want to talk to Zex and see what kind of fuel pressure you have when spraying 100 shot on their kit. Let us know how it goes!

 

What were you running prior to the nitrous(all motor)

All I have been able to manage is a 13.6 on streets with just intake and header, no LSD tranny(quaife coming soon if car doesn't sell.)

 

I GET the feelin that my special computer helps alot. it came reprogramed right from japan. redlines at 8.5 and not speedlimiter. the lsd will make a big diff on street tires. you have to make the car light remember i weigh 1900 pounds with big block. stock they are 2400 pounds si coupe. weight is everythin!!!!!!

 

If your are going to start pushing higher than a 75 shot, I would recommend going with a direct port system (basically you mount a nossle before each cylinder directly into the intake manifold, like your fuel injectors) and consider upgrading the internal components of the engine (rods and pistons). You really shouldn't try to push more than half the stock HP out of nitrous with stock parts, your going to break something. By the way, 11.9 is damn impressive, good job. Seeya.

 

How did u get it so light?