Engine/Transmission (1998.5 - 2002) 2nd Gen AFE stage 2 owners take caution

[Bob4x4]

Its alot easier to install TSM cold air intake, and it is actually a cold air intake, using factory box, it has tube that pulls air from high pressure at cowl, thus pressurizing the air box. I had a k&n cold air, but those types of intakes just pull scrambled hot air that's swirling around under hood. They dont provide any outside air such as the TSM provides.

My egts are lower, and cool down is twice as fast.

:-laf I did 1/4 mile testing instead of dyno on that product to give it a better chance in showing it's value. On my truck I got absolutely no decrease in E. T or increase in MPH.



My AFE systems do draw outside air on both the 2nd gen and 3rd gen and flow sustantialy more air.

 

[EForbes]

Ok tell me how those types of air filters draw outside air. The only way is if you plumb it yourself, then you have to look at the size of the opening you are plumbing with, if you dont think that pulling air from cowl, is colder than a open air filter under hood, then my 69 camaro cowl induction is just for show lol

 

[Bob4x4]

Ok tell me how those types of air filters draw outside air. The only way is if you plumb it yourself, then you have to look at the size of the opening you are plumbing with, if you dont think that pulling air from cowl, is colder than a open air filter under hood, then my 69 camaro cowl induction is just for show lol

Pull up the AFE cat and look at their enclosed systems



A normally aspirated gas engine is in much more need of cold air than my turbocharged aftercooled diesel.

 

[Eric Lee]

I thought a PSM (or TSM) pipe was the way to make the stock box better too, so I got one. With whatever enclosed product - I believe there is a box about the size that will fit in the space available. What I don't like about the cylindrical filters is that it seems they distort the pleats and compress the interior side quite a bit.



Does anyone know the area difference in the flat versus a cone that will fit in a box?



Can these motors theoretically out flow the flat filter? Out flow the stock box? At any RPM?



I still think this is alot of buzz over shim sham scat. Intake 'inventors' thinking they know whats best for a well designed engine system.



- My2c - Eric

 

[Bob4x4]

The cone shape is a very eficient design that enhances air flow. The flow bench proves this. The issue is not how many cfm a filter will flow but how many with little to no restriction. The big AFE cones flow enough for our 5. 9's at less than 2" of water at any rpm you can spin it. The stock paper or the various brands of the bhaf can not do this.

I have seen a sustantial hp increase on the dyno by removing a bhf and installing an AFE cone on a fairly mild truck.

 

[Eric Lee]

PSM Diesel's site has some data on their site under 'filter test results'. They recommend the PG7 as the best choice/compromise for a less restrictive filter with adequate efficiency - stock removes 99. 6% and AFE's PG7 gets 99. 2%. It lists the pressure drop after filter - stock paper 8. 5 (psi?) flat PG7 at 7. 7 and 10. 3 for the conical PG7.



http://www.psmdiesel.com/afe_air_filter_2nd.php



If that data is correct I still feel realy good with my set up - PSM's data states their system will support most single turbo apps and up to 650 hp.



- Eric

 

[EForbes]

I agree with you Eric, thanks for the info, and the link.

 

[FULL TILT]

I have the stage 2 and i have not had any problems with heat and i got my egt's up to 12 and ran it for a min and nothing so i am staying with the kit i like the added performance i gained over the others

 

[ILIANBG]

Anyone tried the new AFE Stage 2 enclosed system with the PG7 filter (part #75-80072). Looks pretty nice, and supposed to not be louder than stock. Will this be of benefit to me in getting a bit better mpg? If breathing is easier, maybe mpg will improve and smoke will be less under hard acceleration? I am not sure about it, so I would like to hear about it from people who actually use it, to see if there is improvements in those areas.
Thank you.
Ilian

 

[Chief USA]

Anyone tried the new AFE Stage 2 enclosed system with the PG7 filter (part #75-80072). Looks pretty nice, and supposed to not be louder than stock. Will this be of benefit to me in getting a bit better mpg? If breathing is easier, maybe mpg will improve and smoke will be less under hard acceleration? I am not sure about it, so I would like to hear about it from people who actually use it, to see if there is improvements in those areas.

Thank you.

Ilian

As I posted above, in my opinion, these filters are JUNK. The Stock OEM filter flowed more air than these AFe filters. I was able to set off the filter minder NUMEROUS times using these AFe filters BRAND NEW out of the box. (with the wrapper REMOVED)



If you want more air flow and an air filter that will last a LONG time... ... . get the BHAF and Outerware prefilter and be done with it. The BHAF is very simple to install and will flow enough air to pretty much be compatible with nearly any engine modification. I also strongly recommend installing the BHAF with a good quality heat shield. I have a 1/8 diamond plate aluminum heat shield installed with my BHAF and Outerware prefilter.



I am sure others will disagree with my view but this is what I found to work WELL and meet my needs.

 

[ILIANBG]

Thanks CHIEF USA, I appreciate it. Did you run this particular intake that I mentioned above (the new totally enclosed version with the bigger cylindrical filter)?
It's always good to make sure we are talking about the same thing. If so, I will stay away from that. Don't want to spend that kind of money in this case.
All opinions on the product are appreciated. Thank you.
Ilian

 

[Chief USA]

It has been a good while since I initially purchased the aFe filter but it was the drop in style conical reusable/washable filter that was supposedly their highest flowing filter of this type. IIRC it was the PG7 or substantically similar filter. This particular filter dropped directly into the OEM airbox and was a direct replacement for the OEM filter. We may be talking about 2 different filters or items here, not sure.



I do think in my opinion, that pretty much nothing will out flow and retain the same paper filter efficiency of the BHAF.

 

[Bob4x4]

Cheif... ... ... . you are incorrect. We pulled a 2nd gen onto the dyno,made a few passes to be sure it was consistant. Swapped on an AFE set up and gained a good increase. It has been years so I don't want to quote a inaccurate # but it was like 12-18 something in that neighborhood.

Illian,I am pretty sure you remember my trucks. They have always run AFE. Both see more dirt than most on this site. Both still running great.

Most AFE users report some mileage gain on the 2nd gens. My 94 ran with much less smoke than a previously installed oversize K&N cone at elevation

 

[Chief USA]

Thanks CHIEF USA, I appreciate it. Did you run this particular intake that I mentioned above (the new totally enclosed version with the bigger cylindrical filter)?

It's always good to make sure we are talking about the same thing. If so, I will stay away from that. Don't want to spend that kind of money in this case.

All opinions on the product are appreciated. Thank you.

Ilian

ILIANBG,



Just for FYI, here is a good write-up about the BHAF, part #'s, and the template for the heat shield download.



BHAF - Big Honkin Air filter



I think you will be very satisfied with the BHAF. These K&N, aFe, and other high flow air filters are designed to supposedly flow more air BUT at the expense of allowing more particulate particles to pass through the filter into your engine. NOT the best thing for a diesel. The BHAF is a paper filter that filters as good or better than the OEM paper filters. Combined with the Outerware prefilter, this combination will last a LONG time (read many 1,000 miles depending upon conditions). Two BHAF filters would very likely last for the life time of your truck. NO filter oil, no washing..... just put it on and use it until the filter minder sets.

 

[Chief USA]

Cheif... ... ... . you are incorrect. We pulled a 2nd gen onto the dyno,made a few passes to be sure it was consistant. Swapped on an AFE set up and gained a good increase. It has been years so I don't want to quote a inaccurate # but it was like 12-18 something in that neighborhood.

Illian,I am pretty sure you remember my trucks. They have always run AFE. Both see more dirt than most on this site. Both still running great.

Most AFE users report some mileage gain on the 2nd gens. My 94 ran with much less smoke than a previously installed oversize K&N cone at elevation

Bob,



That may have been your results. Glad it worked for you. This filter certainly did NOT work for me with my particular engine & it associated mods.



Compare filter surface area of your aFe or other similar filter with that of the BHAF and I think you will find a notable and huge difference. Some folks don't like the size, look, and under hood space consumed by the BHAF. For those folks, the aFe filter may be a good choice. It was not a good choice for me.

 

[Bob4x4]

Bob,



That may have been your results. Glad it worked for you. This filter certainly did NOT work for me with my particular engine & it associated mods.



Compare filter surface area of your aFe or other similar filter with that of the BHAF and I think you will find a notable and huge difference. Some folks don't like the size, look, and under hood space consumed by the BHAF. For those folks, the aFe filter may be a good choice. It was not a good choice for me.

You were using a stock air box then compare to a no box system???Not quite apples to apples.

Ilian was asking about a kit,not a drop in.

 

[Chief USA]

You were using a stock air box then compare to a no box system???Not quite apples to apples.

Ilian was asking about a kit,not a drop in.

Drop in or otherwise. It is YOUR money waste it and throw it away as you see fit and to your heart's content. Freedom of choice is what made this once great nation great.



Samuel Clemens is credited with having said:



"Get your facts first, and then you can distort them as much as you please. "



I heartily agree.



When you get tired of wasting your money on aFe filters, I am sure you will just love the BHAF.

 

[ILIANBG]

Hi guys.

I read above about the melting issue of the AFE replacement piping going above the turbo on the AFE Stage 2. Is it still an occurring problem. How close is it to the turbo, or they changed it? It's pretty pricey to have that issue!

CHIEF, yes I was asking about the complete kit, the new fully enclosed kit (#75-80072 with PG7).

I just wanted to hear if someone is using one of those on a 2 gen. and learn from their experience.

The BHAF seems a good choice, I've never seen one installed in person. If I were to get one of those, I would have to go back to stock set-up before going for a smog check (when time comes). I don't think I'll pass if they see the BHAF. Nevertheless, I am looking at the BHAF now as well. Seems when you need to replace it (it's about $ 50), and you can find it in many places, made by different companies (a good thing).



Bob, I know you had a kit on your 94 the last time I saw you. I also think your truck makes a lot more power then mine, so you probably need the flow you get from your set-up. I don't remember exactly if it was the same thing I am talking about (the fully enclosed PG7). If it is, how do you like it? Is it really CARB certified, as a guy told me at AFE, when I called about a month ago. I do not want to compromise the engine if the filtration is not up to par. I can not afford to buy another engine or have it rebuilt. I would really like if the new filter set-up I choose reduce the smoke under hard acceleration, and hopefully gain a bit in mpg. If these two are not going to be affected, then there is no reason for me to change anything. Filtration, again, is really important for me. I do not want extra noise in the cab, these trucks are loud enough from the factory. This truck so far has been awesome to me, I can't ask for a better one, so I want to keep it that way.

Thank you, guys, for all the information you provide. It has always helped me.

Ilian

 

[ILIANBG]

Did AFE do any change to the new Stage 2 to prevent it from getting really hot as some have experienced?
Ilian

 

[Bob4x4]

I have not had any of the heat problems,AFE did change the material used in the hose to take more abuse. I have towed with the 94 a few times roughly 1000lbft of torque so yea it gets a work out. Cajon pass with the trailer in overdrive with 3. 54 gears and 35" tires. Left lane for this rig Come by when you are in the area so you can ck it out in person.