Bigblock

300 to a tank highway.4.56 5 speed 31-10.50's

TransAmBandit

Any tips on improving economy?

89needsatranny

>12 before new O2 sensor

17.786 after!!!!
still need to fix sticky EGR....dont know if it will help any

CRafferty

Bad...
I'm averaging aboot 12. Maybe 13 on a good week.
It's hard where I'm at because it's all just steep hills around town and alot of stopping and starting again.

91diesel

91' 4X4 pickup 22-23 around town, 25-27 highway. Running a 3.0L auto with 4.10's and 32" tires. 3" exhaust and intake, no muffler.

flashkl

Go downhill a lot. Seriously though, if the engine's running good, checking the intake/exhaust and making sure all's clear seems to be the best thing to do. Check your O2 sensor, check your cat, check your air filter, clean your tb.

ironroad9c1

Do yourself a favor and get rid if that intake restriction called a tornado, its crap
and ditch that sorry ass restrictive flowcrapper muffler. then you will see some gains.

flashkl

Flowcrapper...whaaaaaa??

ironroad9c1

yea that's right flowmasters suck, they are the worst flowing mufflers out there.

kinzer

wait, your saying flowmasters are restrictive? they have 3 baffles, the only thing less restrictive is a glasspack or straight pipe.

and yes i know that the tornado is a gimmic but it cost like 15 bucks and they dont make throttle body spacers with a vortex effect and it did help a little, OH and im actually getting better gas milage now then before the exhaust intake lift and 33's

flashkl

I'm sure theres less restrictive mufflers out there, but our trucks do need some backpressure, otherwise you lose ALL the low end. If kinzer ditched the muffler, he would lose performance, not gain any.

kinzer

thank you flashkl, dont know what he was thinking. i do have a little back pressure but i dont do great in the low end. i mostly have mid rang 2000-3500 roughly is my power range but it really depends on what gear im in.

ironroad9c1

back pressure is a myth, old wives tail, you need to get as much exhaust out as quick as you can to fill the chamber with incoming fuel and air, only way you will lose bottom end is with a cam change.a free flowing exhaust isn't gonna change the powerband that much on the bottom end.I have been there and done that ,plus i was a tech for toyota for # years. I know what works and what doesn't on these trucks.

93toyrunner

I highly dought back pressure is a myth you have to have back pressure no back pressure reduces hp either that UTI one of the largest automotive schools in the country is wrong and along with every teacher i have met. Yes high flow exhaust are a must but it complete bs if you say a straight pipe has better performance than a highflow exhaust other wise people would not spend all the money on them.

ironroad9c1

Yes that is that I'm saying, you don't think a wall in the middle of the muffler is restrictive?
The results in HP order:
1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq
2.Bassani Real Street 373.7 hp/ 333.8 tq
3.Hooker Maxflow 373.5 hp/ 333 tq
4.Borla XS 373.3 hp/ 332.6 tq
5.Magnaflow 372.8 hp/ 332.5 tq
6.MAC 372.3 hp / 331.5 tq
7.Flowtech Afterburner 372.3 hp/ 330.1 tq
8.Hooker Aerochamber 372.1 hp/ 330.4 tq
9.Bassani 372 hp/ 333.5 tq
10.Spintech 371.6 hp/ 332.2 tq
11.Edelbrock Performer RPM 370.9 hp / 331.3 tq
12.Borla XR1 370 hp/ 334 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 hp/ 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq
17.No muffs 365.2 hp / 330.1 tq


read this article and LEARN about exhaust.
http://www.pontiacstreetperformance....p/exhaust.html

This guy went faster after losing the flows and going to a better muffler, I don't recommend straight pipe at all, don't work.




read this also.
http://www.uucmotorwerks.com/html_pr...torquemyth.htm

Don't get me wrong, I'm not saying install a3 inch exhaust all the way back, but what you want is to keep the exhaust FLOW up , you don't want it to come off the manifold and then dump into this big open pipe, that slows the gasses down, what you are trying to do with a proper exhaust is use the hot gasses from the exhaust to actually create a vacuum in the chamber as the exhaust valve opens , there by drawing in more air and fuel mix into the empty chamber . you really need to understand how a engine works to picture it in your head. kinda like when you are driving down the road, and you crack the window, to smoke a cig, well it draws the air out of the cab, where as if you roll the window all the way down the air blows into the cab. see what i mean?

and as far as that TB spacer, its junk,
With as much air that's rushing in, the little twisty grooves in those spacers don't do much good. They just don't have enough surface area to be able to improve the flow enough to justify getting them. and the tornado is really restricting your intake pipe, has 0 value to it. take it out for a week and you will notice a little improvement.

TransAmBandit

Do you know if the truck has a 02 Sensor after the cat? I havent checked it.

ironroad9c1

There is an old saying,, those who can DO , Those who can't teach.
your instructor is a moron if you told you engine need backpressure.
and i don't say a straight pipe is better either.

Belize Off Road Team

My truck supports the whole back pressure is a myth. i am running basically straight pipe (i do have a resonator and that's it)for over 1 year now and dyno'd 130 horsepower at the wheels with my 3.0L V6 petrol 3VZE. i have no issue where as i have driven a 4runner 3.0 with a "high flow" system and there is a difference.

93toyrunner

you said there is a difference with the high flow system is this a better difference or worse and which would you prefer the high flow or just the resonator, I am asking because my cat is clogged and I was going to replace it with a high flow magnaflow cat but if just a muffler is better i will just cut out the cat and leave my thrush tturbo mufller on.

ironroad9c1

get a new cat, they are not restrictive. and for that v6 I would have a good mandrel bent 2 1/2 system non of that crush bent muffler shop crap.