Has this one been asked?
Thread Starter
|
Senior User
Joined: May 2003
Posts: 132
Likes: 0
Has this one been asked?
Ok, so i reckon you guys might have some good feedback.
I have a 408(scat stroked 351c) supercharged to 4psi with an eaton M112 blower, in my 84 bronco.
its on straight LPG (propane to u yanks
), fed by 2 x GRA 400 CFM carbies.
and im thinking nitrous. after researching nitrous oxide, it seems to be a match made in heaven. i have a spacious post-boost intake manifold, just achng for some nitrous foggers/injectors. will it work? will it have to be a 'dry' system?
my engine's internals are pretty strong. Scat rods & crank, probe pistons, 8.5:1 comp, solid lifters, alloy 2v AFR heads.. all with less than 5k on the engine.
(engine link http://www.airflowdynamics.com.au/Pr...ngine_408c.htm )
- Sean
I have a 408(scat stroked 351c) supercharged to 4psi with an eaton M112 blower, in my 84 bronco.
its on straight LPG (propane to u yanks
), fed by 2 x GRA 400 CFM carbies.and im thinking nitrous. after researching nitrous oxide, it seems to be a match made in heaven. i have a spacious post-boost intake manifold, just achng for some nitrous foggers/injectors. will it work? will it have to be a 'dry' system?
my engine's internals are pretty strong. Scat rods & crank, probe pistons, 8.5:1 comp, solid lifters, alloy 2v AFR heads.. all with less than 5k on the engine.
(engine link http://www.airflowdynamics.com.au/Pr...ngine_408c.htm )
- Sean
Post Fiend
Joined: Jan 2007
Posts: 18,157
Likes: 0
From: Stanton DE
Originally Posted by jstandle
Why not just up the boost?
I would just up the boost to 8 or 10 PSI.
But if you get a nitrous kit it's best to run a wet kit. and make sure your fuel pump or pumps is up to handle the extra HP.
Thread Starter
|
Senior User
Joined: May 2003
Posts: 132
Likes: 0
I'd love to up the boost...
however I like my engine reliable, and low boost & low comp is very good for this... that and the eaton M112 is redlining at 4psi when my truck does 4500rpm, so it would require another, larger, supercharger... and eaton doesnt make them any bigger :/
the truck storms around the roads really well, and I cannot fault it, however if I ever see that AMG suv again I'd like to give it a surprise, nitrous style...
thought I'm wondering which would be cheaper/wiser.. complete nitrous kit, installed... or 4.11 gears.
-Sean
however I like my engine reliable, and low boost & low comp is very good for this... that and the eaton M112 is redlining at 4psi when my truck does 4500rpm, so it would require another, larger, supercharger... and eaton doesnt make them any bigger :/
the truck storms around the roads really well, and I cannot fault it, however if I ever see that AMG suv again I'd like to give it a surprise, nitrous style...
thought I'm wondering which would be cheaper/wiser.. complete nitrous kit, installed... or 4.11 gears.
-Sean
Post Fiend
Joined: Jan 2007
Posts: 18,157
Likes: 0
From: Stanton DE
I gotta say that is the most original and cool looking set up I have ever seen..Nice work!
Stock Lightning comes with a M112 and 8# of boost from the factory. Guys on the Lightning site are running them a 15 PSI.
I used to run a M90 at 10 &1/2 PSI
With your low compression you would have no problems running more boost.
If your trying to decide on gears or nitrous. With the gears you'll have the extra power all the time.With the nitrous you have to keep filling the bottle.
Stock Lightning comes with a M112 and 8# of boost from the factory. Guys on the Lightning site are running them a 15 PSI.
I used to run a M90 at 10 &1/2 PSI
With your low compression you would have no problems running more boost.
If your trying to decide on gears or nitrous. With the gears you'll have the extra power all the time.With the nitrous you have to keep filling the bottle.
Thread Starter
|
Senior User
Joined: May 2003
Posts: 132
Likes: 0
Thanks Phil6608, i really appreciate the kudos 
this is the technical stuff, which will explain why i cant run more boost on this charger;
the M112 unit I have redlines at 12,000rpm, I am running a 2.6 inch charger pulley and a 6 inch crank pulley, (which gives 2.3:1 ratio, for every 1 rotation of the crank, the supercharger rotates 2.3 times)
the charger puts out 1.84 litres of air each rotation... (maths maths calculations) *whazzam* this all means at 4500 engine rpm (my rev limiter) my M112 is doing 10384 rpm (close enough to redline for me)
.: running higher boosts means breaching my chargers redline, thus my desire for nitrous.. and/or lower gear ratio.
but I'll be damned if 4.11 x 2 (4wd) isnt expensive over here in Australia
anyone wanna ship it over for me? I'll pay, of course
this is the technical stuff, which will explain why i cant run more boost on this charger;
the M112 unit I have redlines at 12,000rpm, I am running a 2.6 inch charger pulley and a 6 inch crank pulley, (which gives 2.3:1 ratio, for every 1 rotation of the crank, the supercharger rotates 2.3 times)
the charger puts out 1.84 litres of air each rotation... (maths maths calculations) *whazzam* this all means at 4500 engine rpm (my rev limiter) my M112 is doing 10384 rpm (close enough to redline for me)
.: running higher boosts means breaching my chargers redline, thus my desire for nitrous.. and/or lower gear ratio.
but I'll be damned if 4.11 x 2 (4wd) isnt expensive over here in Australia
anyone wanna ship it over for me? I'll pay, of course
Trending Topics
Moderator
Joined: Jun 2003
Posts: 3,550
Likes: 72
From: Calhoun GA
Honestly, what burns up pistons and pops head gaskets is poor tuning. Unless the rest of the rotating assembly is old and fragile, running 2-4 more psi shouldn't hurt a thing if the timing and fuel are dialed in properly.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
FTE Leadership Emeritus
Joined: May 2004
Posts: 18,787
Likes: 30
From: Melbourne, Aus
In that older thread of yours... we kind of decided it wasn't feasible to increase boost. But with 8.5 CR and 4lb you still have a fair window before you will start pinging. Whats your spark advance set at for 3k?
So, giggle gas huh?
You have to be careful you don't lean out... if you want to install a dry system that is.
What I think would be a good idea is have a supplentary propane injection system... like what a lot of diesels have, so when you "flick the switch" on your nitrous, you can still have enough fuel.
And your Bronco is your daily driver isn't it? I personally don't like lower gears, on anything that you want to drive out the gate at the track. But thats a personal thing, I like to have an engine idling while cruising at 60
So, giggle gas huh?
You have to be careful you don't lean out... if you want to install a dry system that is.
What I think would be a good idea is have a supplentary propane injection system... like what a lot of diesels have, so when you "flick the switch" on your nitrous, you can still have enough fuel.
And your Bronco is your daily driver isn't it? I personally don't like lower gears, on anything that you want to drive out the gate at the track. But thats a personal thing, I like to have an engine idling while cruising at 60
Fleet Owner
Joined: Mar 2003
Posts: 24,724
Likes: 74
From: Blue Hill Township
Spray a small dry shot before the blower. It will drop your IATs tremendously and pick up a lot of power for ya. A 50hp jet will pick up around 100-125lbs of torque and 60 or 70hp simply from the cooler air charge.
A dry kit is either sprayed through the MAF and uses that to add the extra fuel or it is sprayed post MAF and bumps the fuel pressure up. Either way is fine, just make sure you throw a wideband on it, especially since you are supercharged. A wideband, Mallory 685 (which also has can accept a MAP sensor for boost timing retard), FPSS and some conservative tuning will go a long way in having a reliable setup.
A dry kit is either sprayed through the MAF and uses that to add the extra fuel or it is sprayed post MAF and bumps the fuel pressure up. Either way is fine, just make sure you throw a wideband on it, especially since you are supercharged. A wideband, Mallory 685 (which also has can accept a MAP sensor for boost timing retard), FPSS and some conservative tuning will go a long way in having a reliable setup.