• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

No power no exhaust!


yooperhillbilly

New Member
Joined
Dec 10, 2012
Messages
2
Reaction score
0
Points
0
Location
U.P.
Vehicle Year
1990
Make / Model
Ford
Transmission
Automatic
alright i just bout this 1990 ranger 4x4. plan on making it a mud/trail rig and DD. gotta lift for it on the way and new intake. but anyway, truck has no exhaust, use to be my friends and he cut it off at the manifold, so no cat or anything, so obviously no back pressure=no power. can i throw on some duals with a cherry bomb on them for enough back pressure to get some power back or do i need to replace O2 sensors and Cat? i would rather not do that, expensive even doing it myself.
 


Rock Auto 5% Discount Code: F9A1A579ACFAD1: October 1st, 2021

Slipknotyk

New Member
Joined
Dec 9, 2009
Messages
26
Reaction score
0
Points
0
Location
Denver
Vehicle Year
1997
Make / Model
Ford
Engine Size
4.0
Transmission
Automatic

adsm08

Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
34,623
Reaction score
3,564
Points
113
Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
Ok, you are both idiots.

Hillbilly, you get the award because you are openly suggesting that you want to commit a federal offense by DDing a vehicle newer than 1975 without cats. It is illegal per FedDOT, irregardless of your local laws and can subject you to fines of up to $5000 per missing cat if you get caught.

Slip, you get one because you have seriously suggested running an EFI engine without an oxygen sensor. Will it work, yeah, will it live, no. It will foul plugs, suck fuel, and it will never be quite right.


I'll even throw one in for the PO of the truck for chopping the exhaust off without knowing anything about what he is doing.



Now, "backpressure" is a huge misconception. Your lack of power is related to your lack of exhaust but it has nothing to do with pressure. The way exhaust helps is actually more of a vacuum effect. The exhaust pulses move together and help draw each other down the line. You lose that effect as the pipe size increases. If you want true duals, I would try to stay at 2" or less.

http://www.thumpertalk.com/topic/571594-exhaust-backpressure-the-myth/
 

shane96ranger

Well-Known Member
V8 Engine Swap
Joined
Oct 20, 2009
Messages
8,333
Reaction score
210
Points
63
Location
Utah
Vehicle Year
1997 / 1989
Make / Model
Ford F150-Stang
Engine Type
V8
Engine Size
4.6 Triton / 5.0

yooperhillbilly

New Member
Joined
Dec 10, 2012
Messages
2
Reaction score
0
Points
0
Location
U.P.
Vehicle Year
1990
Make / Model
Ford
Transmission
Automatic
1st of all i know its illegal. although i drove my previous truck 3 years without a cat and never got a ticket, nor has my friend everytime hes gotten pulled over. i just want a quick fix. if i actually keep the truck for more than a year than yeah ill put a cat on it but its a beater with a heater.
 

Slipknotyk

New Member
Joined
Dec 9, 2009
Messages
26
Reaction score
0
Points
0
Location
Denver
Vehicle Year
1997
Make / Model
Ford
Engine Size
4.0
Transmission
Automatic
That's exactly what I thought this was about: finding the bargain-basement solution.

Every one of their points are valid. I just want to add that there's doing things right, and then there's doing things cheap. Doing things cheap is likely to cause issues, which is what the point made by these gentlemen was was. I was trying to make suggestions on how to do things cheap.

For example, on my first vehicle, my cooling fan relay went out. Because I was so poor, and needed a fix to keep the vehicle moving for another 2 weeks until I could buy the new relay, I took the cheap way out. I alligator clipped the lead for the cooling fan directly to the battery. The result? 2 months after I had replaced the relay, the cooling fan motor itself went out.

My opinion is that, if the vehicle is disposable, go ahead and take the cheap way out. If it's a vehicle you care about running for longer than 6 months, then it will absolutely cost you less to do things the right way.
 

Andy D

Active Member
Joined
Jul 9, 2011
Messages
1,940
Reaction score
8
Points
38
Location
Marshfield MA
Vehicle Year
94
Make / Model
The Rat
Engine Size
4.0 OHV
Transmission
Manual
My credo
to prevent Found On the Road Dead, Fix Or Repair Daily
Most catless cars' exhaust smells differently than cat exhaust. I ranted for yrs about having to use cats. And all the other insults like lead free gas. EPA and the current ethanol boondoggle

I am a breast cancer survivor. It doesnt run in my family, so it was exposure to what my brother calls methyl-ethyl -bad stuff in my environment. I am a smoker ,currently in quit mode., on top of all the other crud I've inhaled whilst trying to make a living. So, the least I can do is keep cats on the exhaust. Least I can do is to show myself as a cautionary tale I'm lucky, I am down to 5 pills a day and only 2 doctors. .:D
 
Last edited:

kimcrwbr1

Well-Known Member
Joined
Dec 6, 2009
Messages
6,044
Reaction score
41
Points
48
Location
maplevalley WA
Vehicle Year
1983
Make / Model
ford
Engine Size
2.8l
Transmission
Automatic
In my opinion its like getting a rescue animal that has been abused and throwing it in a pen and never feeding it. Lets not mistake being broke with just being lazy. Do a proper diagnostic compression/vacuum tests if the engine is on its last leg by all means run it till it pukes. If the engine is in good shape still then you have to fix it correct or the ranger gods will haunt you for life.
 

85_Ranger4x4

Forum Staff Member
Forum Moderator
Article Contributor
V8 Engine Swap
OTOTM Winner
TRS Banner 2010-2011
TRS 20th Anniversary
TRS Event Participant
Joined
Aug 7, 2007
Messages
27,761
Reaction score
8,196
Points
113
Location
SW Iowa
Vehicle Year
1985
Make / Model
Ford
Engine Type
V8
Engine Size
5.0
Transmission
Manual
Most catless cars' exhaust smells differently than cat exhaust.
True, and it is odd how different catted exhausts can smell too.

I think most of my allergy problems stem from an overly active sense of smell though... :icon_twisted:
 


Top