Topic: Installing aftermarket air intake on 90 YJ

[C.Redbeardd]

whats an LC1?

[sharpxmen]

whats an LC1?

wideband programmable O2 sensor (you can log wideband AFR and also simulate narrowband O2 output). www.tuneyourengine.com

[C.Redbeardd]

and that will tell you fuel pressure?

[sharpxmen]

and that will tell you fuel pressure?

air/fuel ratio

[C.Redbeardd]

where can I find a hand gauge to hook up to the TBI to test the pressure? I believe there is a pressure test fitting on it where you stick a guage of some sort.

[sharpxmen]

where can I find a hand gauge to hook up to the TBI to test the pressure? I believe there is a pressure test fitting on it where you stick a guage of some sort.

in that doc there's a diagram showing where you install the gauge on the pressure regulator. I have no idea what the fitting is, you'll have to figure it out - worst case scenario you take the t/b with you and take it to a parts store - they can probably get you a fitting to connect the gauge to the pressure check port

[C.Redbeardd]

Thanks! I'll keep that in mind.

[chardrc]

with all this talk about smooth intake pipes it would probably be beneficial to make a new pipe from the tb to the aitrbox since that is a bendy hose that is not smooth at all inside (see picture on page 1)... that's spreading that link... if you go 1 step back form there there is alist of alot of usefull pdfs that would be worth saving to your computer for future ref.

[C.Redbeardd]

so a straight hose from the filter box to the TB would be beneficial as well?

[chardrc]

id think it would flow batter than the stock one (i haven't realy messed around with my intake so can't say anything from experience). since the walls of the stock (pip) go in and out zigzag like...  my only 2 concerns would be that i think the stock tube ends are ovals.. and that the motor moves a good bit so you'd still need some flexibility to make it work...

[vprsrul]

Neither the TBI or the MPI Jeeps have a MAF sensor - they both use a MAP sensor which cannot be harmed by the oil on the filter. So for all intents and purposes of this thread (Title: Installing aftermarket air intake on 90 YJ) not sure how is it relevant. The original poster asked this question as he could not find one for a 1990 YJ and i suggested an available (and cheaper) alternative to an aftermarket intake with almost the same results, i had no intention of discussing the dyno results of some diesel truck with which i have absolutely no experience or to discuss the pros and cons of aftermarket intakes, not to mention that in this case if you go offroading and it's a dusty trail it takes 2 minutes to put a stock airfilter back on to make sure it keeps the dirt out. If the thread title was "Is there any benefit on installing a KnN filter on xyz vehicle" I would have stayed out of it. My point was: rather than spending money on an aftermarket intake and piping use the current airbox, get a high flow filter, open the inlet, open the outlet, replace the connecting hose with a smooth metal pipe (ideally use a mandrel bent pipe and create an adapter to the t/b) and you will get almost if not the same results as the aftermarket intake for $30 or so.
the reason the aftermarket intakes have a more significant gain is because it addresses all these little things in one package which by themselves could be too less to notice but added up are something you could put your finger on.

For some reason we derailed the thread in this back and forth about KnNs and MAF and other stuff which is off subject and could be a thread on it's own so i'll stay out of it since i feel i got carried away and turned this into something else rather than what was meant for.

considering the fact that the maf and map sensor serve the same purposes I am going to assume you have no idea what you are talking about.  So yes overoiling the filter can damage either of these types of sensors.  also this thread is exactly what he asked for which is still what we are debating,  and again I will say it.  A k&n filter is an absolute waste of money, reducing the solid restrictions in the intake tube will show a increase but again not much.  My examples were meant to be exactly that, an example.

[sharpxmen]

considering the fact that the maf and map sensor serve the same purposes I am going to assume you have no idea what you are talking about.  So yes overoiling the filter can damage either of these types of sensors.  also this thread is exactly what he asked for which is still what we are debating,  and again I will say it.  A k&n filter is an absolute waste of money, reducing the solid restrictions in the intake tube will show a increase but again not much.  My examples were meant to be exactly that, an example.

yeah genius, you really nailed it with that map and maf serve the same purpose (and i'm the one who has no idea)
find the map on your Jeep then tell me how the oil gets there and go lurk some more on those sites you've got your info from and see what they mean when they say it will damage the heated element on the maf sensor (you can also ask what's the difference between maf and map, you might find someone there to tell you if you didn't piss anybody off)
Jeeps run with oil in the airbox from the valve cover lot more than the oil on the filter - how many failed MAPs have you seen?

and read the whole thread before posting dyno results of your dad's 900hp truck.

[C.Redbeardd]

yeah genius, you really nailed it with that map and maf serve the same purpose (and i'm the one who has no idea)
find the map on your Jeep then tell me how the oil gets there and go lurk some more on those sites you've got your info from and see what they mean when they say it will damage the heated element on the maf sensor (you can also ask what's the difference between maf and map, you might find someone there to tell you if you didn't piss anybody off)
Jeeps run with oil in the airbox from the valve cover lot more than the oil on the filter - how many failed MAPs have you seen?

and read the whole thread before posting dyno results of your dad's 900hp truck.

  

[C.Redbeardd]

considering the fact that the maf and map sensor serve the same purposes I am going to assume you have no idea what you are talking about.  So yes overoiling the filter can damage either of these types of sensors.  also this thread is exactly what he asked for which is still what we are debating,  and again I will say it.  A k&n filter is an absolute waste of money, reducing the solid restrictions in the intake tube will show a increase but again not much.  My examples were meant to be exactly that, an example.

actually, i dont care much to here about your truck or how much hp it has. So no, most of what you are saying is pretty much off topic. I asked a simple question. Boy, no -1? haha

[sharpxmen]

whats an LC1?

here's a good tool that let's you play with a few variables and calculates the power output as well as CFM flow.
http://www.msdfuelinjection.com/MSDInjectorV1/main.html
on the right hand side it will show you the CFM rating of the intake, lb/hr for fuel and air (based on air temp) and estimated HP. The injector rating is most likely calculated considering 80% duty cycle for the required lb/hr in fuel (the injector rating is given for a specific pressure when the injector is always open and is called static flow) so that's why you will see a higher number in the injector flow size range compared to the required lb/hr fuel flow.

i used these numbers to get to the HP of the 1990 2.5L tbi

Displacement: 150 cu.in.
Max rpm: 5250 (i used the max power rpm, but you can use redline rpm to find out the max cfm, however the VE goes down past the 5250 point)
Inlet air temp: 75 deg F
Estimated VE: 77
Number of Injectors: 1 (since is TBI)
Air/Fuel Ratio (again at max power which is in open loop): 13.5
BSFC (brake specific): 0.48

Power output for all that is calculated to 117.5HP - pretty close to what the stock rating is of 117 for your year.

Now let's say you improve your intake flow and the VE increases to 79 (by 2% which is attainable) and also reduce the intake air temp to 70F by using a cold air inlet for the airbox - the resulting power is 121.7HP - a 4hp increase - but look at the injector size high limit - it changed from 70.5 to 73 lb/hr - that is the difference in flow you need to compensate - on the top left of the page under operations drop down select flow rating and use 14.5 psi as old pressure, 70.5 as the starting flow, put in 15.6 as the new pressure and click calculate - the resulting flow will be 73.10lb/hr - pretty close to what the calculations came at. You can also try to go a bit richer to 16psi fuel pressure, that will give you a flow of 74.10 lb/hr and a resulting power of 123 (so another 2 hp) - but keep in mind that this is an exercise meant to show how the output power varies with air-flow, real world is different so that's why is best to take baby steps and use seat of the pants dyno to get an idea of where you're at. also visual check of the exhaust gasses - you don't want blowing black smoke which would mean you're too rich.
 
But this will give you an idea of what to expect from certain changes (you can also change your max rpm to 6000 let's say if you want to see what a perf cam will give you, again would be approximate but gives a good picture of what the mods give you).