Finalizing my nitrous setup

mrowe · 03-03-2021, 09:59 PM

I have ventured into the Nitrous realm this winter out of mere curiosity and of course the pursuit of faster times. I need some expert feedback on what I have done.

I'm a bracket racer and have a 219" Racecraft rail 468 BBC 2-bolt mains with a Powerglide. Never on the dyno but time slips and weight support something around 600-700 HP on the engine.

I'm running a single-stage plate wet system with NOS sniper solenoids. So far I have the following items added to my setup: All MSD electronics including 6AL ignition, crank trigger, billet distributor (locked out centrifugal advance) and a start and step retard control module. I also have a transbrake cutoff module activating the nitrous after the T-brake releases and only when the WOT switch is on.

As for the engine mods, I have TRW 50 cc domed pistons and H-beam rods. Brodix aluminum heads with 119 chambers. Head flow numbers supported a cam lift of around .650, which I have a .653/.660. I have the rings filed to .025 which were calculations I got off of some NOS website (4.31 bore times x) don't remember the site. Fel-pro head gaskets with .039 compressed thickness. Compression ratio is around 11:1 or 12:1. I didn't measure the deck clearance so I'm not entirely sure about the compression. I usually run the timing advance around 38 deg and will shoot to retard the step module to 31 deg.

So, is there anything I'm missing or absolutely need to change? How much Nitrous can I pour into this thing without destroying head gaskets, cooking pistons or shooting the mains out of the pan. I'm thinking anything over 250 is not recommended and I'm not sure this plate would pump anything over that HP rating anyway.

Sincerely,

"Nitrous Novice" Mike

03-03-2021, 09:59 PM	#1
mrowe Junior Member Join Date: Jul 2018 Posts: 5 Likes: 0 Liked 0 Times in 0 Posts	Finalizing my nitrous setup I have ventured into the Nitrous realm this winter out of mere curiosity and of course the pursuit of faster times. I need some expert feedback on what I have done. I'm a bracket racer and have a 219" Racecraft rail 468 BBC 2-bolt mains with a Powerglide. Never on the dyno but time slips and weight support something around 600-700 HP on the engine. I'm running a single-stage plate wet system with NOS sniper solenoids. So far I have the following items added to my setup: All MSD electronics including 6AL ignition, crank trigger, billet distributor (locked out centrifugal advance) and a start and step retard control module. I also have a transbrake cutoff module activating the nitrous after the T-brake releases and only when the WOT switch is on. As for the engine mods, I have TRW 50 cc domed pistons and H-beam rods. Brodix aluminum heads with 119 chambers. Head flow numbers supported a cam lift of around .650, which I have a .653/.660. I have the rings filed to .025 which were calculations I got off of some NOS website (4.31 bore times x) don't remember the site. Fel-pro head gaskets with .039 compressed thickness. Compression ratio is around 11:1 or 12:1. I didn't measure the deck clearance so I'm not entirely sure about the compression. I usually run the timing advance around 38 deg and will shoot to retard the step module to 31 deg. So, is there anything I'm missing or absolutely need to change? How much Nitrous can I pour into this thing without destroying head gaskets, cooking pistons or shooting the mains out of the pan. I'm thinking anything over 250 is not recommended and I'm not sure this plate would pump anything over that HP rating anyway. Sincerely, "Nitrous Novice" Mike