Gutting the Cat

[FlipKing]

I've heard it increases MPG, but can also slow you down on some motors. 1.8 Miata motor will it increase my MPG and not slow me down? Reps for any help

[VTECking]

Heres a link to find your answer
www.google.com

[silversol]

DO NOT DO IT! it will hurt your mpg not help! you probably also lose low end power, plus you wount be able to pass emissions!

[FlipKing]

VTec thank you so much for that. Silversol I dont have emmsions, but it will hurt mpg and slow me down? :( thats not good,lol

[VTECking]

^ LOL, sry I just had too.

[FlipKing]

:-p lol. This is a car forum, so I figure this is the best place to ask for Car advice,lol

[stillaneon]

why would you waste a cat. Go by a straight pipe and sell the cat. Core supply companies will pay you 60 + dollars for a cat

[FlipKing]

Well, if will hurt mpg and hurt hp, then i'm leaving the cat in place,lol

[Scotsman]

it will kill , low end , i did it( no emmisions FTW) , but when i took my silencer out of my car i lost a chit ton of back pressure , hence noticable loss of power , IMO i wouldnt do it

[stillaneon]

Well, if will hurt mpg and hurt hp, then i'm leaving the cat in place,lol

Buy forced induction. Back pressure isnt as big of a deal then

[FlipKing]

Alright then, I'll leave it on. Just looking for the simple hp gains first. Advancing the timing once gas drops a bit

[FlipKing]

No cash for turbo right now. Once my other car sells i'll have 400 to put into the car. I'm thinking intake and exaust and header if i can find a cheap one

[stillaneon]

remember.

Cheap+Fast=Not Reliable
Cheap+Reliable=Not Fast
Fast+Reliable=Not Cheap

[FlipKing]

Lol, very true, by cheap, i mean a used one. Usually not that much of a difference in performance when you talk exaust and header. there are differences in intake though

[stillaneon]

Lol, very true, by cheap, i mean a used one. Usually not that much of a difference in performance when you talk exaust and header. there are differences in intake though


There can be a lot of difference but honestly what good is the header going to do with out a decent exhaust. Not muffler.

Your best bet with the 400 would be to put a decent suspension upgrade on the car. What good is a 12 sec daily driver if you have to slow down to 60 so make a turn?

That and motor mount. Your going to run into a problem when you have power and no way to transfer it to the ground...

[FlipKing]

I can have exaust done for 200 or less. I could get shocks and coilovers for 400 maybe, not full suspension

[stillaneon]

well I mean the springs would be a good place to start.

[FlipKing]

hmm, i'll look into it. Miata's have decent handling to start with. I like straight line speed, but you are right, handling is important

[Atlblkz06]

It may free up 5 ponies but at the cost of a 15000% increase in emissions.

I'll pay the 5 ponies, and its too bad not everyone thinks this way.

[flak_monkey]

I can't speak for your cars, I've got a 95 z28. In an LT1, you can pick up more HP by getting rid of the cat.

LT1, stock, with longtubes, off road y pipe, and a tune will see about 30hp. Just by getting rid of the catalytic converter, you can get about 8.

[Slomaro Z28]

I can't speak for your cars, I've got a 95 z28. In an LT1, you can pick up more HP by getting rid of the cat.

LT1, stock, with longtubes, off road y pipe, and a tune will see about 30hp. Just by getting rid of the catalytic converter, you can get about 8.

QFT :goodjob:, but look at the size difference in motors here, plus it makes the exhaust sound better IMO.