mods please do not move as i an asking the tbi know it alls a tbi specific question about how they hooked it up.

i would like to know how easy it is to hook up a nitrous kit to my tbi stock 305? what will i need? whats the biggest gain i can get without internal work? is it going to break anything real fast on me?

i just need that extra power on demand when needed.

 

Took about 3 hours on mine.

I used the Nitrous Works tbi kit. Pull the throttlebody, install the plate and throttlebody, cut the fuel feed line to install the T adapter for the fuel solinoid - make sure it reaches the throttlebody correctly. (I do recommend getting a set of flexible lines, rather than the hard lines that come with most kits - it makes mounting the solinoids easier.) Mount the WOT switch and any added safety switches. Be careful on adjusting the WOT switch, you don't want it to far so it won't hit or too close so the linkage can break it. Mount the bottle and run the feed line. Hook up an arm switch, and run the wires to a GOOD relay. Attach power to the relay. You're pretty much ready to go, just be sure you have good fuel pressure and don't spray to big a shot for your fuel pump to keep up.
Also, follow all standard procedures for setting up the nitrous jets - pulling plugs right after a run and making sure you aren't going lean is critical to engine life...

At a minimum for safety, run a fuel pressure safety switch, WOT (wide open throttle) switch, and seperate arming switch. A window switch is also a pretty good idea, just to be sure you don't spray at too low of an rpm or over rev.

I spent more time playing with jets than the install, but that was mainly fine tuning. The jets that came with the kit were fair, if a bit rich. Good luck!! Nitrous is an addiction, once you start - you want to use more...

 

how big of a shot are you running how much faster is the car with it?

 

Right now I'm only running 125. It really isn't that much of a difference. It's noticable, but nothing like they show in the movies. I've ran 150 jets, and that was a bit more fun - but my fuel pump is starting to show it's age. With 150s installed, I tripped the fuel pressure safety switch a couple times. So, I stepped back the jets and it's keeping up so far. Next project is a fuel pump...

On the original 305, I never went more than 80 jets. But the old 305 was getting pretty weak, it had just over 200k miles on it when I threw the rods through the block.

 

mine only has 52k miles on it. so 125 would be fine? can you compare that to the speed of a car itd keep up with?

 

ask cam91rs...he is in the mid 12's with his 305tbi with nos

 

I've been spraying a 125 shot for a while into the stock head/bottom end/T-5 305 with no real complaints. I'm going to step it up to a bigger shot this winter and see how it does but it's really cool knocking a second off of your quarter mile time by flipping a switch

 

so if a run a 150 shot id only run it on weekends would that be fine or would i be looking to break something such as the 700r4 or anything in the block? i have new rapid fire ac delco plugs as of maybe 2k miles ago.

also id like to know how far would a 20 oz bottle would get me? would i be able to get away with somewhere around 2 runs a weekend with it from 2nd gear not too long of runs?
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how does the NOS #05153 kit compare the the nitrous works kit?

 

i wanna put a 75-100 shot on my 150k mile 305. think it is do-able?

 

bump sorry it was getting too low and im in on a good deal right now

 

anybody know is holleys #05153 kit is as good as the nitrous works kit which i read most people have?

 

ive been told from other people to only run a 100 shot but something tells me im gonna want to run a 150 if i can lol. already have the nitrous bug and havent even installed it yet

 

as long as you have good fuel pressure you can do it. maybe take 2 degrees out and gap the plugs a little closer. aftermarket ignition helps alot too

 

dont i need colder plugs and what gap should i use? will it affect my daily driving w/o nitrous? what times in the 1/4 can i expect? and how do i hook up a fpss?

 

I'm running one step colder plugs, with the base timing set at 2 degrees. I run about 8 degrees normally on the 350. It could probably live with more, but I don't want to risk pre-ignition and blowing a hole in a piston. You really shouldn't run much if any n2o through the motor without hooking up a fuel pressure gauge and seeing what it holds under an all motor pass. A fpss is pretty easy to hook up. Run it inline with the ground signal from the WOT switch to the relay. To install it, T it into the fuel feed line, similar to the fuel solenoid.

Something I forgot to mention earlier - when you install a plate system, it's just like adding a throttlebody spacer. You will probably have to tweak the throttle linkage and reset the TV cable (if it's an auto), and maybe adjust the fuel lines to screw into the throttlebody.

As far as what I've ran for comparison... My room-mates 91 Gt, with a little work, has slips for 12.98. I can take it, on the bottle, by several car lengths. I've never taken the Iroc to the track, since it's just a bad weather vehicle. I only bought it for days that the weather is a little rough to ride in. Everything I've done to the camaro is just to make it a little more fun and competitive with the GT.

 

so how does the fpss really work i dont understand it reads the pressure and when it goes below does it cut the electricity to the relay to cut of the nitrous? also where would i want to put this and how to you attach it to a fuel line?

 

The way I'm running mine, it doesn't cut the power - it cuts the ground. It basically maintains a ground through the sensor until it drops below it's setpoint, then seperates the contacts.

The install is just like hooking up fuel for the N20 system. Put a T into your fuel feed line, preferably close to the throttlebody. You really need a pressure gauge to set it properly, unless you use a non-adjustable.

 

ok thanks im almost there now i just want to know about spark plugs, retarded timing, and which jets ill need from NOS to get 125 wet shot. o and one more question what difference does a hiflo bottle make from a non hiflo? is it better for power or something?

 

As far as plugs go, I run a range colder. I'd read, and still see it all the time, that running a non-protruding tip plug makes better power on the bottle. I tried it, and it didn't make any noticable difference on spray - but the car ran and idled much worse in normal driving.

Dropping a couple degrees of timing isn't a bad idea at all, especially if you want to run that much through a 305. I never got that brave with mine, even though I know a lot of people have done it. I would hate to be without my bad weather vehicle in a storm, especially if it was because i had to put another motor in it...

I really couldn't tell you on the NOS jets. I'm running 48/38 on my NW kit right now. The card called for 46/46 for 125hp, but that was extremely rich on my motor.

 

well my kit is for the tbi trucks so will the jets included still be right? so i only need to pull 2 degrees of timing and 1 step colder plug with a 125 shot?