cam and injector help

[offroadranger]

hey guys,

I have a 99 ranger 2.5l. So far it has: custom intake, full length "race" header, no egr, ported head and lower intake manifold, and a jet chip.

What I want to do next is add a cam and the 19lb injectors....

Can someone help me out with camshaft selection? What cam to go with for my setup? Do I need new valve springs? If so, which ones?

And on the injectors....I read somewhere you can drill out the mass air flow sampling tube to "fool" the computer into adjusting for the larger injectors...then I read somewhere else this is not the correct way to do it, and you dont gain anything....is having the computer flashed/dyno tuned the way to go? Who can do that?

this is a off road race truck that runs at 4-6000rpm for 4+ hours at a time and seems like it could really benefit from the larger injectors if they can be tuned properly.....I am just clueless when it come to tuning engines. I can install any part you throw at me, but matching parts and getting them dialed in I have trouble with. I think its the lack of patience lol.

Thanks!!!

[Dave R]

Unfortunately, since you have a 'newer' motor, you have the smaller valve stems, which require the unique smaller tipped roller followers, requiring you to use a roller cam, which is not cheap.

Upping the injector size and drilling out the MAF sampling tube works well.

[Mutant Pony]

Racer Walsh will set you up with springs to match the cam you purchase from them. They have complete kits that have everything you need. The prices are a little better than Esslinger.

[offroadranger]

Racer Walsh will set you up with springs to match the cam you purchase from them. They have complete kits that have everything you need. The prices are a little better than Esslinger.

Funny thing is I called racer walsh and they told me I could'nt use an aftermarket cam, because my engine has a cam position sensor and it would'nt run right.....maybe I just need to talk to someone else over there....does'nt make any sense to me...

what size do you drill the maf tube out too?

thanks guys

[Mutant Pony]

No. They're right and I'm wrong. I'm sorry. I'm not very familiar with the 2.5. All I know is that they are BASED on the 2.3 which I know well.

[Dave R]

Funny thing is I called racer walsh and they told me I could'nt use an aftermarket cam, because my engine has a cam position sensor and it would'nt run right.....maybe I just need to talk to someone else over there....does'nt make any sense to me...
Yeah, call them back and ask for somebody who understands EDIS systems. The cam position sensor isn't even on the cam and actually has nothing to do with the cam. Yes, it's strange but true.

[offroadranger]

Funny thing is I called racer walsh and they told me I could'nt use an aftermarket cam, because my engine has a cam position sensor and it would'nt run right.....maybe I just need to talk to someone else over there....does'nt make any sense to me...

what size do you drill the maf tube out too?

thanks guys


OK, thanks guys I'll call them back and see what they say, maybe try esslinger too......


so....anyone remember what to drill that maf tube out too for the 19lb injectors? :dntknw:

[TireIron]

does the 99 have the plastic MAF? That may be different as so far everyone who has done the larger injectors is using the older aluminum MAF housing... I dont know how much different the inside of the plastic housing is compared to the older aluminum housing. For the older ranger aluminum housing it was cut out the post and drill the sampling tube to 15/32". That is for the aluminum MAF housing from a ranger around the 93-94 era.

[offroadranger]

does the 99 have the plastic MAF? That may be different as so far everyone who has done the larger injectors is using the older aluminum MAF housing... I dont know how much different the inside of the plastic housing is compared to the older aluminum housing. For the older ranger aluminum housing it was cut out the post and drill the sampling tube to 15/32". That is for the aluminum MAF housing from a ranger around the 93-94 era.

Mine is aluminum as well.....but the only "post" I see is what holds the actual sensor and tube in place.....we ARE talking about drilling the tube that the actual sensor wire is directly behind right?


Also, one more quicky - the 2.5 is just about the only engine running the 14lbers right? So if I have a 92 3.0 in my garage, those injectors should be 19lb?

Thank you guys so much for your help. This is the ONLY place I have found with such info....:icon_cheers:

[Dave R]

Yes, you want to drill out the sampling tube and remove the post. BUT, be sure to remove the sensor from the housing first!

Not sure what injectors they used in the V6's most guys get their injectors from 4.6 Crown Vic's. (I think)

[offroadranger]

BUT, be sure to remove the sensor from the housing first!



haha, GOT IT. Thank you much!

[TireIron]

a lot of the 4.0L had the 19 lbs, and tons and tons of 5.0L have them. I'd say go for a late 80s early 90s 5.0L and just pop one out and check the color of it.

[offroadranger]

a lot of the 4.0L had the 19 lbs, and tons and tons of 5.0L have them. I'd say go for a late 80s early 90s 5.0L and just pop one out and check the color of it.


What color am i looking for?

[offroadranger]

What color am i looking for?

Can someone tell me what color injectors teh 19lbers are? I have a few ford engines laying around, but dont wanna go too big or too small!? Thanks!

[Zer0PSI]

Hope this helps!

ford injectors
19lb - orange
24lb - light blue
30lb - red
36lb - dark blue
42lb - lime green

[offroadranger]

Hope this helps!

ford injectors
19lb - orange
24lb - light blue
30lb - red
36lb - dark blue
42lb - lime green

immensly! thanks!

[offroadranger]

Hey guys, thatnks for all the help so far.

I got some 19lb injectors out of a buddys old engine, had em rebuilt/cleaned/tested, and drilled out the MAF tube to 15/32".

I just want to make sure this is all going to work correctly.

When you drill that out do you remove that rectangle aluminum plate thats riveted to the backside of that tube? Or leave it in? I dont mean just to drill it out, but permently, does it stay or go or get cut down or......?

Also what is the reasoning behind drilling out that sampling tube? I'm just not seeing the connection there?

THANK YOU!

[offroadranger]

Bueller? Bueller?

Going back together with new injectors this weekend......some help would be sweet!

[Dave R]

The idea behind drilling out the sampling tube is to change the ratio of air that passes through the tube vs the meter to better match your new injectors. Basically your attempting to fool the meter into thinking that less air is passing through the meter so that it reduces the injector pulse that's going to your larger injectors. It sounds complicated but it's not really.

As for the actual modifying of the MAF housing, there are two different types. sounds like you have the older one.

[offroadranger]

The idea behind drilling out the sampling tube is to change the ratio of air that passes through the tube vs the meter to better match your new injectors. Basically your attempting to fool the meter into thinking that less air is passing through the meter so that it reduces the injector pulse that's going to your larger injectors. It sounds complicated but it's not really.

As for the actual modifying of the MAF housing, there are two different types. sounds like you have the older one.

Hmm. OK, but if your fooling it to think theres LESS air coming in.....wouldnt the computer then give LESS fuel? So does that mean the 19lb are too much and were going for somewhere inbetween 14 and 19? I have a decent amount of modifications. Gonna be good? Thanks again

[offroadranger]

um, can I get a little help here?

I put the new 19lb injectors in last night with the modified maf, and my truck runs like absolute crap. It idles fine, but if you try and give it ANY gas at all, it sputters real bad and then it'll sit at 2k rpm for a few seconds and eventually wind back down. One time after it was warm from idling I tried to rev it (just a bit)and it shot to 4k rpm and stayed there till I could run around and shut it off....what gives?

[offroadranger]

Anyone? I have a race to get to in 1 week. I spent $200 on injectors and have a MAF thats modified now.....REALLY need to get this working right........does anyone know what thier talking about with this or is this all hear say?

[Zer0PSI]

Man, thats never happened to me, then again I didnt modify my MAF. All that I can think of is to reset the EEC (disconnect the battery for 10 mins) and then drive it around so the computer can readjust.:icon_confused:

[offroadranger]

Man, thats never happened to me, then again I didnt modify my MAF. All that I can think of is to reset the EEC (disconnect the battery for 10 mins) and then drive it around so the computer can readjust.:icon_confused:


Yeah as I was drilling out the MAF sensor I thought, man I should have tried it stock first, but I put all my trust in the guys that said to do it, asked for an explanation of WHY but got nothing back, so I'm hoping they will chime in here.

I reset the computer and got the same results.

[offroadranger]

so, zer0 - did you run the bigger injectors with the stock MAF? and it worked fine?

[Zer0PSI]

Yes I did, but I run megasquirt, meaning that I can tune the injectors the way I want them, I just ported my MAF. The entire reason behind drilling out the MAF is so that the computer is tricked into thinking that their is less air traveling through the sampling tube than there actually is. With larger injectors their is probably going to be more fuel injected into the cylinders than you actually need, the reason behind drilling the MAF is so the injectors pulse width is shortened (injectors close sooner). Hope that helps

[offroadranger]

I got it running. Thanks for the help and sorry for doubting you guys - totally my fault. Its runs perfect now.

[Zer0PSI]

What did you do to get it running??

[Dave R]

Hmm. OK, but if your fooling it to think theres LESS air coming in.....wouldnt the computer then give LESS fuel? So does that mean the 19lb are too much and were going for somewhere inbetween 14 and 19? I have a decent amount of modifications. Gonna be good? Thanks again

The computer has no idea what size injectors are actually attached to it. If the computer trims the injector pulses by, say, 10% due to the 'decreased' air flowing through the MAF, your still getting more fuel than you would have stock since you have installed 35% larger injectors. It takes the computer a short time to relearn but, it shouldn't be a problem.

What did you do to solve your trucks issues?

How did the modifying the MAF go for you?