chargedek

Hey all,
I was thinking it is at all possible to use a direct port nitrous injection kit with itb's?
Anyone do this and is it even possible.

Thanks in advanced
chargedek

jamheg1101

yes it is possible. I have seen a few with this kind of setup.

chargedek

Anyone got a pic or two of this setup.
I'm real keen to use this setup on my EF9 project

Soccerking3000

there arent any problems with reversion?

Tony the Tiger

There will be reversion, but since the engine is always sucking in air, eventually the air and fuel hanging around in the engine will get sucked back in...

What I would do is clear out most of the stuff near the air horns, so in case a strong intake backfire occurs during on/off throttle movements, it won't catch fire or do damage.

The Original Whitey

I actually am selling my NX direct port kit ( https://honda-tech.com/zerothread?id=1553370 ) but I also have an extra set of CBR TB's laying around from my Banshee project so I was thinking of putting them on and selling it as a D-series ITB direct port combo.




So yeah its possible

LeGeND4LiFe

Why would reversion take place with the ITB's?

Tony the Tiger

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LeGeND4LiFe &raquo;</TD></TR><TR><TD CLASS="quote">Why would reversion take place with the ITB's?</TD></TR></TABLE>

Most ITB's are mated with huge cams on NA setups. Overlap usually causes a little intake reversion or a slight intake backfire at medium to high RPM's.

Chris22215

so is there a way to fix this?

*Boostwerks*

I would be nervous as hell about a nitrous back fire with ITBs. It would shoot a giant flame right towards the fire wall...where fuel lines sit.

Car fires are no fun.

tokesGTR

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bryson &raquo;</TD></TR><TR><TD CLASS="quote">I would be nervous as hell about a nitrous back fire with ITBs. It would shoot a giant flame right towards the fire wall...where fuel lines sit.

Car fires are no fun. </TD></TR></TABLE>

So run an air box with a filter on it, problem solved.

Soccerking3000

but you lose some power and if this is a drag car you usually dont want that...

The Original Whitey

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tokes1320 &raquo;</TD></TR><TR><TD CLASS="quote">

So run an air box with a filter on it, problem solved.</TD></TR></TABLE>


Lol, airfilters stands NO chance against a nitrous backfire.

tokesGTR

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The Original Whitey &raquo;</TD></TR><TR><TD CLASS="quote">


Lol, airfilters stands NO chance against a nitrous backfire. </TD></TR></TABLE>

For the amount of nitrous he's probably going to spray on a honda, having an airbox with a pipe and a filter will prevent the bulk of the flame from hitting all that nice sensitive stuff on your firewall. We're not talking about a 400+ horse plate kit into a BBC, I'm figuring this guy won't spray more than 150-200 max.

MidShipCivic

A couple of seconds of flame hittting the fire wall or fuel line wont do anything.

But I've seen some cars catch fire from a prolonged flame.

On top of that if your having that much back fire you got a problem on your hand.


Modified by MidShipCivic at 7:49 PM 4/11/2006

Phase Change Racing

Don't sweat the reversion issue. You Honda guys don't run enough overlap to make it an issue, that is more for the pushrod crowd. Your nitrous backfire issues are going to come from low intake runner velocity from having 500% more throttlebody area than you need. Kicking the spray on at too low of RPM with too low of intake velocity is what will make you go pop. Running a direct port system on ITB's is no big deal. Just mount the nozzles on the engine side of the throttle blades as close to the head as possible. This will help to prevent fuel fallout and to inject the nitrous/fuel charge into the highest velocity area which will also aid in fuel suspension. Also be sure to engage the nitrous at a fairly high RPM where you have good velocity in the runners and you will be just fine. Gimme a ring if you need any further assistance.

p.s. Think of nitrous like a BBQ. If you light the burner down low right where the fuel and oxygen are mixed it lights and we are flippin burgers. If you light it farther away from that point you must wait for the fuel to reach this point (the oxygen is already there) before comubstion occurs. And when it occurs you are going to be missing a set of eyebrows (or in your cars example you will be missing all of your intake system past the TB hehe).

Weq

i know a guy with an AE86 and ITB's. burnt up his car pretty good with a backfire that turned into an engine bay fire when the throttle stuck open and he bounced off the limter. This was with socks though. his learnt his lesson and fabbed a airbox up.

towvtec

Here was our old set-up, h22 w/twm itb, 120 shot of nitrous, never had a problem...

DxTrix

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by towvtec &raquo;</TD></TR><TR><TD CLASS="quote">Here was our old set-up, h22 w/twm itb, 120 shot of nitrous, never had a problem...
</TD></TR></TABLE>

Thats sick

DaNish

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by towvtec &raquo;</TD></TR><TR><TD CLASS="quote">Here was our old set-up, h22 w/twm itb, 120 shot of nitrous, never had a problem...
</TD></TR></TABLE>

What'd it run/make?

DxTrix

340 hp and we only got to run it on the 1/8 th with a 100 shot 7.2 @ 98 mph with a 1.6 60 ft

chargedek

Thanks for all the info guys.
I have decided not to run the nitrous with quads instead I'll be using a skunk2 pro series intake manifold with a 150shot when the engine is all built and run in.
Thanks for the help I appreciate it.
Cheers
Matt

Phase Change Racing

Awww I didn't know that running a normal *** intake was an option you were willing to do or I would have suggested that from the beginning.

chargedek

Haha it seems like a better option as the quads with nitrous sound lke an *** to tune.

Phase Change Racing

They really wouldn't be any more difficult to tune (maybe to plumb though). I just really don't see what the big deal is with ITB's. It doesn't take 50mm of throttlebody to feed 2 25mm valves. Yes, yes I know those are not the real sizes but you get my point.