Engine/Transmission (1994 - 1998) Is an AFE filter setup better than the AMSOil stock foam filter?

[FATCAT]

Will I get lower EGT's if I install an AFE filter setup, then the AMSOil OEM foam filter I run now?



I would like to lower the EGT's ... especially when towing. The turbo keeps saying "come on theres lots more power available", but he EGT gauge says "whoa there partner, back off that throttle".



I hardly use more than 20 lbs of boost before backing off all the time, and I know there is lots more power available.



What to do, what to do?????????????

 

[1dslram]

The AFE unit is a much better unit and only gets better as you raise the H. P. At the lower H. P. levels there isn't much intake restriction so at 20# of boost there may not be a big difference between the two. Now if you get your truck up in H. P. and am running 35# - 45# of boost there is a major difference between the two in Air flow and lower EGT's. If this question is for your 97 why only 20# of boost. You should be geting about 38# of boost and that alone will drop your EGT's over 100*

Bruce

Bruce

 

[FATCAT]

My PDR HX40 can get 40 lbs of boost, its just that when I'm pulling a 6000+ and up lbs. trailer up inclines the EGTs climb as fast as the boost, and when I get to around 20 lbs, I'm usually around 1000+ degrees. I would really like to reduce these temps.



If the AFE unit will make a big difference 100+ to 200+ degree drop, then I would have to say it will be worth the cost.



I've got a lot of fuel going into the engine, I just need the air to match and the AMSOil foam filter just ain't doing it any more.

 

[1dslram]

First we need to follow the big truckers and already be down shifted at the botton of the hill so the turbo is spooled and pushing air that is where cooler EGT's come from. With out air from the turbo no filter will make a major difference unless something is very wrong. the filter can only help air getting to the turbo if the turbo isn't asking for air no filter will help. I ran a very simular set up to yours using a #5 plate and an H2E turbo that is a lag hog. But keeping the RPM's above 1750 and mostly at 2,000 I could keep the boost up and the EGT's down. But there was no increaseing speed on the hill but I could hold speed.

Bruce

 

[JohnE]

I don't see "timing" in your signature. Is your timing up to 16°

1000° if pre- turbo isn't bad. You still have another 200° comfort zone before getting into the caution department.

The Amsoil filter is a great unit, but I think the stock airbox is really limiting. Have you removed the fender boot?

 

[FATCAT]

I don't see "timing" in your signature. Is your timing up to 16°

1000° if pre- turbo isn't bad. You still have another 200° comfort zone before getting into the caution department.

The Amsoil filter is a great unit, but I think the stock airbox is really limiting. Have you removed the fender boot?

I have done nothing to the timing ... it has never been touched since new (180K on the truck now). When you say the "Fender boot" are you refering to the small oblong tube between the air box and the hole in the fender ... yes, that is gone.



1dslram, I understand about keeping the rpms up, but most of the the time when towing I run into (you know) A-Holes on the highway. The ones who do 60 in a 65 and always on hills. Or someone who cuts in front of you and THEN slows down. This always causes me to have to slow down, then I have to pass usually on hills just to get close to the speed limit. I'm ready to blow a gasket at this point ... not the truck.



But as I said originally, when I have a long incline the temps just seem to be too high. Does the AFE flow more air than the stock box with an AMSOil filter? Is there a big problem with the AFE drawing warm/hot under the hood air? Is there negative air pressure under the hood?

I would like a way to ram air down the air filter (like a scoop on the hood), but without major modifications ... I'm not to handy with that stuff.



Even droping 100 degrees would be worth it to me.

 

[y-knot]

First, the Amsoil cotton gase filter is very good, and probally the best choise for the stock replacement. It fits very tight, unlike the K&N filter and has a foam cover on it's outside. I have used this filter in the past and really liked it, it's only drawback is it is limited by the factory air box. I modified mine by drilling 6-7, 1 1/2"- 2" holes in the housing. This helped by letting it breath free'er, and would be a great mod for you if you are going to stay with your stock type air filter system.

If you are really after the best system that will allow the engine to breath, lower your EGT's while under a load, and improve filterization while looking good doing it, then the AFE is a good choice. If has 3-4 times the surface area of your stock air filter, and flows circles around it as well. They look nicer and the maintanence is much easier. Make sure you get the PRE-FILTER screen that fits over the air filter. That works great, most of the dirt gets cought by that pre-filter and for a quick cleaning, just slip off and shake of blow out with air. Then re-install and you are ready to go, it keeps the main filter clean. Good luck

 

[CarlJensen]

Do a search on AIR FILTERS. There has got to be dozens of threads on TDR that deal with air filters but be ready for a long read and lots of opinions. You can allways go with a BHAF and get tons of filter area. Read the threads and make up your own mind.

 

[1dslram]

FATCAT:

I have had all of the popular air filters BHFA with and without a baffel, stock, K&N, Amsoil, ScottyII etc. I had the best luck with the Scotty II it did drop my EGT's the best of all the different one's I tried. I am going to build a unit simular to the ScottyII but larger for the filter I am going to have AFE build for my truck. I believe the ScottyII is the best unit for lowering EGT's. I added a 4" intake from the valance on the drivers side, it helped add more air but added a lot of road dust and junk so I capped it off.



As far as the idiot that is going 40mph up hill and you can't get around or the one's that pull out in front of you at a much slower speed it is called down shift and hold back that craving to do the most appropriate thing. You can't get enough air untill twins are under the hood and they have their limits also. I presently have a steel cowl induction air hood, but I can't say that it made a major difference.

Bruce

 

[JohnE]

FATCAT

I use and really like the BHAF. The stock filter needed a lot of periodic cleaning which is good & bad. Clean is good, but opening the filter box frequently adds more chance for leaks.

The BHAF lasts for over a year especially after I added the Outerwears cover.

First, the Amsoil cotton gase filter is very good, and probally the best choise for the stock replacement. ...

I thought Amsoil is an oiled foam filter

I have had all of the popular air filters BHFA with and without a baffel, stock, K&N, Amsoil, ScottyII etc. I had the best luck with the Scotty II ...

I can see the ScottyII providing the best air induction, but the turbo whistle from even an open AFE filter kills my ears. How do you find the noise level?

 

[FATCAT]

I do have a BHAF, and tried it last summer for a while. My EGTs were up about 50 to 100 degrees over the Amsoil foam filter, so I went back to the Amsoil file.



The Scotty II filter setup is nice, but I don't want to cut a 4 1/2" hole in my firewall, something about cutting a hole in the truck does not appeal to me. The AFE seems to be what everyone is saying would work good ... better than my stock box Amsoil foam filter. I think I may give it a try, but it better be better than my Amsoil for the $$ that thing costs.



Who has a good price on it ... Genos? I don't see the a "Pre-Filter Screen" for sale at Genos ... who else is a good vendor for this product?

 

[GAmes]

Afe

For what it's worth, I did two dyno runs back to back with an AFE and a K&N in the stock box. The AFE gave me 2 more hp, 4 more fp of tq and 100 degrees cooler at WOT (pre-turbo).

 

[FATCAT]

Thanks for the replies folks. I will be going with the AFE.