raftdaddy

i am adding a zex 125 shot and just want to make sure i'm ok.it's a dry kit that recommends fuel be set at least 40 psi.
- timing 8.5 deg
-fuel 45 psi (still have 19lb inj)
-need plugs for gt-40 one deg colder than stock (need part #'s).
-have msd coil and 8.5 mm wires but stock ign.

can you guys see any issues? i need help with gt-40 plug part #'s one or two deg colder than stock.
allso do you think it's an issue driving around most of the time at 8. degrees timing.i'm in a small town and 91 octane is as good as it gets.

AdderMk2

8° timing should be good
fuel pressure looks good, but what pump do you have... I certainly hope it isnt stock.
Autolite 103's
MSD coil is crap... stock ignition should be a HUGE ordeal... just gap your plugs small.. like .042-.045

mjr46

i wouldn't worry about a colder plug with only a 125 shot, i run a 100 shot and all i do is pull timing and for saftey sake i run 110 octane

raftdaddy

i have a walboro 190 lph,so i'm good there.thanx again guys,i just wanted to make sure i'm not gonna blow her up first time out.first time having N2O.

AdderMk2

190 probably wont cut it. Ive never understood why people even buy the 190... the 255 is the same price...

mjr46

is your kit a wet or dry kit OP??? IF IT'S DRY, fp WILL BE important to bump up for each no2 run, but pump size is important as stated

302army187

would be less work to buy the parts you need to go wet.

otherwise have the injector's and maf to support the bigger shot.

otherwise you sound like your doing fine.

raftdaddy

so you figure the 190lph is to small?and it is a dry kit with a vacuum line for my reg.the kit states the fuel pressure will spike to 80 psi at wot.are my 19 lbs inj too small?i knew i was pushing it but thought they were good to 350 400 fwhp.(frpp cat stated it). and it was the salesman who told me 255 was too big for my set up as it would heat the fuel at idle.should i be dropping to 75 or 100?

raftdaddy

just did an injector calculater and i'm guessing 300 fwhp +125 nos @80% dc which came to about 33 lbs at 43.5 psi. but does Nos have a diffrent effect.i'm sur i can go 100% dc which changes it a bit.but lets face it i'm running for only 12-13 seconds like that. i'm sure the calculater would be for n/a setups.i'll be 90% n/a 10% juice.were is the happy medium?

AdderMk2

get 24# injectors