Exhaust from the manifold back

Post by **PrecisionBoost** » Wed Jan 28, 2004 3:58 am

Another thing to think about when digesting this math is the material out of which the exhaust is made of.

Aluminum is really nice and light but it transfers heat really good which results in a major cooling down of the exhaust gasses.

Iron stays hot and keeps the exhaust temperature very even but it's very heavy.

Titanium is great but $$$$$$

$$$$$$

damian007vk · Post by **damian007vk** » Wed Jan 28, 2004 2:54 pm

thanks for info....appreciate it............so i guess I neeed to go out and buy some exhaust wrap.......i just don't want to redo my entire exhaust like my new mechanic is telling me......it was very costly.....I rather just spend 50 bucks in header wrap....get rid of the cat and replace with resonator, if i can obtain the same performance.....

Post by **Efratech** » Wed Jan 28, 2004 3:23 pm

Its better if you remove the CAT...

Also i read an article the other day (i really dont remember where and why) it said that is better to have a slightly bigger exhaust when running NOS

damian007vk · Post by **damian007vk** » Wed Jan 28, 2004 3:47 pm

what about backpressure.....is it true that a car needs backpressure to run at its optimum....if I have the gas to hot through too big of a pipe exiting so fast....wouldnt the engine not have any backpressure???

Post by **PrecisionBoost** » Thu Jan 29, 2004 7:01 pm

Backpressure is a restriction and restrictions require the engine to "push" the exhaust through the pipe.

Restriction = Loss of horsepower

The best design is to have no pipes at all but it's really really loud (I ran my car with no exhaust manifold for a few seconds when doing some testing)

Plus there are several problems like carbon monoxide getting inside your car.

Maximus · Post by **Maximus** » Mon Mar 01, 2004 1:32 pm

I went on a dyno toady and I am very pleased

the new header gave me 10 Hp

Here is the dyno graph:

daewooluvr · Post by **daewooluvr** » Mon Mar 01, 2004 1:44 pm

hmmm what's going on there between 4K and 5K rpms?
can you also get an A/F readout with ur dyno?

If anyone is interested, here's a handy conversion page
http://locost7.info/converter.php

121.31 whp
120.94 lb/ft torque @ 3800 rpm

Maximus · Post by **Maximus** » Mon Mar 01, 2004 3:54 pm

daewooluvr wrote:hmmm what's going on there between 4K and 5K rpms?

No idea

daewooluvr wrote: can you also get an A/F readout with ur dyno?

I think I can, I'll check this out when I will be dynoing my woo wih the turbo conversion

mocpac · Post by **mocpac** » Tue Mar 02, 2004 12:08 am

Maximus wrote:I went on a dyno toady and I am very pleased the new header gave me 10 Hp

Here is the dyno graph:

Just the header give you 10hp or all the exhaust system?

senate · Post by **senate** » Tue Mar 02, 2004 1:53 pm

Removing your cat in australia is not only illegal, but stupid.

The FIRST time you get pulled over by a defect station you'll be busted..that means your car is off the road, you gotta go adding a cat back in, getting it engineered, taking it to the RTA to get tested on an EPA meter again, THEN paying the fines before you can drive your car again.

Worth the risk?

Only if you're an idiot.

You can get JUST as much performance and sound out of a GOOD exhaust system while keeping the cat.

Not to mention the fact that they now have road-side dB testers on major roads here to test exhaust noises, and if you're over the limit? yep.. you guessed it.. ANOTHER defect.

People here wonder why they get harassed by the cops and why modified car drivers have a bad reputation, while at the same time doing stuff that's illegal yet totally and utterly useless. If you wanna break the law, make it worth it and do some PROPER performance mods *cough-rotorconversion-cough*

Maximus · Post by **Maximus** » Tue Mar 02, 2004 7:21 pm

mocpac_ser wrote:Just the header give you 10hp or all the exhaust system?

Only the header

Maximus · Post by **Maximus** » Tue Mar 02, 2004 7:24 pm

MR187 wrote:Removing your cat in australia is illegal

Fortunetlly I live in Poland...

MR187 wrote:You can get JUST as much performance and sound out of a GOOD exhaust system while keeping the cat.

Yeah, yeah...

If you don't want to remove your cat don't do it but do not say bullshit like "the removing of Cat doasynt give any performance please....

Maximus · Post by **Maximus** » Thu Mar 04, 2004 10:29 am

daewooluvr wrote:hmmm what's going on there between 4K and 5K rpms?

I know what it is, all our Cars have this it is coused by the E-tec

daewooluvr · Post by **daewooluvr** » Thu Mar 04, 2004 7:18 pm

so it looks like a new intake might be better to do...

*edit* having a duh moment... etec really has nothing to do with the intake but yeah a new intake wouldn't hurt either

The original daewootech forum

Exhaust from the manifold back

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