i have a b20/vtec that is resleeved and has an 11:0:1 compression with je piston. i didnt get aftermarket rods, but i did had them shotpeen. my head is pretty much stock except with skunk2 stage 1 cams. anyways, im planning on putting in a 80 shot NOS direct port system in and i was wondering is it safe that im doing a 80 shot NOS direct port system with my rods being shotpeen?
what u mean by not nos friendly? will i lose performance? how bout crower stage 2 cams or are stock cams best to use with nos? are there certain cams to use with squeezing nos?
also is there any other parts that is best to upgrade( like fuel injectors) if im running nos or is stock injectors good enought? i want to run nos safe as possible.
Originally posted by roby stock injector is adequate, fuel is provided by the fuel pills..upgrade your pump
yep, upgrade the pump for sure with a wet/DP system.
colder plugs with a bit less gap if you haven't gotten them yet.
or if you have a stronger ignition system (which i advise you get eventually) you can leave the gap close to stock. make sure you get enough ignition retard, if you predetonate much or often those stock rods may not hold up well.
Skunk2 stage 1 cams aren't bad for N2O, they are similar to the ITR/CTR cams which quite a few people run with 75-100 shot. if you go with the aggressive Crower or Skunk2 stage 2 or 3 then don't use N2O injection.
GSR cams are fine and the ITR/CTR even better with tuning. i used the GSR cams with my DP system and they worked fine.
N2O injection is any means of injecting/using N2O or Nitrous Oxide on your motor.
N2O works fine with higher C/R's and more aggressive cams, but only to a limit. if you have too much duration on the cams some of the N2O may be wasted and go out the exhaust side. i don't know of the Crower stage 2 specs of hand but some people don't use them due to their longer duration. some use them and do extra tuning to make them work better.
ITR/CTR cams are good OEM cams to use, not too aggressive but work very well for N/A and N/A with N2O. i used stock GSR cams with 11:1 C/R and 100 shot direct port NOS system last year. it worked great though i could have made more power with R cams or Skunk2 stage 1 cams.
i'm still using the B18C1 that i used last year, but i no longer run N2O on it. it's just N/A and i'm actually in the middle of pulling the motor as i write this. the only power increasing mods done to the internals were 11:1 C/R forged pistons and i P&P the head mildly. Eagle rods and Ferrea valves were used also, along with Portflow valvesprings (all 32). i ran the stock GSR IM (since i was using a plate system for the GSR) with the secondary butterflies removed, stock TB, stock fuel rail, stock 240cc injectors and stock cams. i did use cam gears to adjust cam timing, a ram air intake, DC JDM 4-1 headers with 2.5" Carsound cat and generic cat-back system. it was never dyno tuned and i used the stock P72 ECU untouched. i got a Hondata system but never got around to installing it before i removed the entire N2O system.
i never ran it at the track but on the street most cars didn't stand a chance. to be honest with you i never lost a race to anyone on the highway or light to light. there were some close ones though.
to some this seems impossible but it's true i kid you not. i raced about 65-70 cars, all kinds of cars too. just for fun though.
Mods: top fuel air filter kit,KW suspension fully adjustable,custom made exhaust sustem
So isnt there any problem for b16a and b18 engines with 11:1 cr (or close to this ratio) with ctr cams and nitrous injection??
Only thing needed is forged pistons?
I'm a bit comfussed about how cr and nitrous react to eachother and what must have to handle both:all motor power and FI power with nos in the same motor:
each setup will need it's own tuning and components. if you use 93 octane fuel (pump gas around here) and 11:1 C/R, you should be fine with stock ignition timing which is 16 degrees BTDC. if you add boost or N2O on top of that, you'll need to retard the ignition timing and add more fuel to avoid predetonation and make power too.
some run 12-12.5:1 C/R all motor with barely any ignition retard on pump gas, 91-93 octane.
others run lower C/R, 9-10:1, with pump gas and boost on top of that. ignition retard is normally .5-1 degree per pound of boost and the fuel is tuned also using larger injectors and Hondata or a standalone.
the bottom line is that you need to add the extra fuel with N2O and boost, and just as important you need to retard the ignition timing per amount of O2 being forced into the motor.
if the C/R is higher than you'll need a bit more ignition retard than if the C/R was lower, like 10:1 compared to 11:1 ratios. when you use forged pistons and SS valves, you can run more boost or inject more N2O. but of course you'll need to add the fuel and pull back the timing.
with enough fuel and the proper ignition timing curve you can run any reasonable C/R with boost, N2O or a combonation of both boost and N2O together. whether or not your motor holds up to that is based on the tuning and if you're using OEM internals or aftermarket forged pistons, new rods and valves. OEM cast pistons and OEM rods/valves won't handle lots of N2O or boost, even if tuned very well, for a long time. forged pistons, billet rods and SS valves will withstand the beating even with a higher C/R if tuned correctly.
as for a higher C/R + CTR cams + N2O, the ignition timing has to be tuned or set and the fuel must be there. not to mention the CTR cams dialed in to make the broadest powerband without predetonation or the like. but also with the longer duration cams some of the compression will be bled off, so static may be 11:1 but dynamic may be a bit lower or higher depending on the rpm and cam settings on the cam gears. 11:1 C/R with CTR cams and a 50-100 shot is fine if you're using the correct fuel, have the timing down right and have enough fuel going into the motor with the N2O.
Mods: top fuel air filter kit,KW suspension fully adjustable,custom made exhaust sustem
:eek: :eek: Thank you very much sweet.You field many gaps i had until now
So proper tunning is the start of everything i guess when talking for reasonable power amounts for the internals of our engine.
My engine has already 10.2:1 c/r (B16a) so should i live it as is if i go with ctr stuff such as cams throttle body,intake manifold and forged pistons (and billet rods? : )
if i want to spray an 80 or max 100 shot??
quite a few people run 75-80 shot on their B series motors without much trouble and they seem to last awhile. you don't need forged pistons, new rods and SS valves etc. to run N2O, but if the motor has high mileage or lots of wear and tear then it may be a good idea to do a rebuild with new, better parts. but most likely the internals of the B16A or B18 will hold up fine, unless you go overboard with it or run the incorrect amount of fuel/ignition timing.
some have run as much as 120 shot on their stock B18C motors without problems. it all depends on the usage, how it's tuned and how you maintain the motor in general.
10.2 is fine for N2O. you can use the CTR cams but it's kind of a waste to get them (unless you get them really cheap and install them yourself) to use with only 10.2:1 C/R. they were meant for 10.8+:1 so you won't see max. performance from them with only 10.2:1. power gains will be seen with the cam timing adjusted for your setup.
is it safe to 100 shot of nitrous direct port on my shotpeen rods or is 80 shot the safest? i dont want to shoot too much because i only have one car to drive cause i kno my block will definitely take the 100 shot but will my shotpeen rods? or will i need aftermarket rods?
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