Outer Limits 4x4 Board

Folks,

From another thread:

Suzuki Viagra wrote:There's 2 beliefs on exhausts and you'll never get a "right" answer. Start the great debate.

Here's the two theories:

1) ANY FLOW RESTRICTION IS BAD NEWS AND ROBS YOU HORSEPOWER

2) WITHOUT BACKPRESSURE YOU'LL LOSE BOTTOMEND POWER

I guess it comes down to what you want to believe.

I'd go for something bigger as the original Zook pipe is tiny, 1 1/2" - 2", aiming for something in between the two theories. Too big and the noise inside the cabin's gonna deafen you.

Putting a 2 1/4 pipe on my Vitara WAS gonna be my next "improvement".

So my question is:

I've already got a 2.25" exhaust - is that going to be too much exhaust for a 1.6L Vitara Engine?

Suzuki Viagra - did you do the upgrade? Has it improved things?

Note: I'm happy to install another muffler into the system if it is going to be too loud, and obviously the connection between the exhaust and the engine will need changing - but i'm just wondering if the whole system would need replacing due to it's size?

Many years ago in another incarnation I used to build exhaust systems and when I need to change my Vit exhaust I'm looking at 2". The 2&1/4" will work but you may find the power up top and a little less down low. It's not so much less back pressure as it is efficient cylinder head scavenging that you are after. As I don't want to lose out down low, 2" for me. This also seems to be what others have found but it will depend on how you drive, to what you want.

cj wrote:Many years ago in another incarnation I used to build exhaust systems and when I need to change my Vit exhaust I'm looking at 2". The 2&1/4" will work but you may find the power up top and a little less down low. It's not so much less back pressure as it is efficient cylinder head scavenging that you are after. As I don't want to lose out down low, 2" for me. This also seems to be what others have found but it will depend on how you drive, to what you want.

Silly question - but will a set of extractors or similar solve this issue? Or is the back pressure controlled by the whole exhaust - not just the part closest to the engine?

Ok Greg i know why you think you have to change our engine but how are people like Joey getting his engine emission approved. Is it a simple task of taking it to another engineer, have you approached VicRoads and asked the hypothetical question. What about making the car look less "Hey there goes a wacky car, I better pull him over and give him a canary"

Just trying to save you some considerable $$$ you will be down if you have to bin the cap engine and go he Vitara route

Being in the dark is just eating you up inside isn't it grimbo?

I used extractors, HSV cat, 2" into 2 1/4" exhaust (after rear muffler from memory although it might be afetr cat.

It seems slightly too large - they recommended 2" right through, 2 1/4" for EFI ones.

However my carby is pretty r00ted and is running way rich anyway so any issues could be with that - it does pop and f/\rt a bit. Sounds great on the power though.

2" would be good I reckon 2.25" may be slightly too large but what the heck it's there use it.

Any issues with lack of power or bottom end are probably to do with the 31"S or the carby

"Silly question - but will a set of extractors or similar solve this issue? Or is the back pressure controlled by the whole exhaust - not just the part closest to the engine?"

A good set of tri-Y headers will assist with delivering a stronger broader torque curve in the lower to mid range. They aid in improving the scavenging effect. If you want to build an exhaust for a specific rpm then a 4 into 1 would be better. As for the rest of the system, well the length is also an issue in it's performance so what you end up with is a compromise within the space available.

greg wrote:Being in the dark is just eating you up inside isn't it grimbo?

Being in the dark is fine I eat my carrots.

If this isn't about you being scared of getting pulled over in the capsiz and having problems with the engine passing emissions then my mistake, I'll waste my time looking for people not using the search button

well, hope my 2c is worth something...

i have a vitara, swb, 1.6L carb. the exhaust i'm running is:

4-2-1 headers/extractors, into 2" through to the hi-flo cat.
2" cat back, with a mega-flo muffler.

i found that the power band is higher than standard, about 1000rpm higher. low down is not there as much, but she does want to rev a bit more.

pops and crackles a lot from backing off the go pedal, but sounds pretty good on the go, or under load.

havent had any problems, as theres more fast tracks up here than big boulders to crawl over.

also, is its worth anything, my carby 1.6L keeps up quite good with the 1.6L EFI.

one thing to do is look after your carby and settings. also, another good way to get a bit more power and better response from the 1.6L carb, (not sure about efi) is to run 10w-30 engine oil, instead of normal 20w-50 etc. etc.

try it out, works for me.

grimbo wrote:Ok Greg i know why you think you have to change our engine but how are people like Joey getting his engine emission approved. Is it a simple task of taking it to another engineer, have you approached VicRoads and asked the hypothetical question. What about making the car look less "Hey there goes a wacky car, I better pull him over and give him a canary"

Just trying to save you some considerable $$$ you will be down if you have to bin the cap engine and go he Vitara route

Oh my goodness, gold from Graham, will wonders never stop!
Greg I agree with Graham, (just don't tell him that) try another engineer, and mabe make the car at least look stockish, and while there is nothing wrong with reserching the 1.6 swap, I would put some more energy into the cap, (at least while you are still in a bludge job and can aford the time )
Peter.

Also Greg, I would think that with all these posts about 1.6's,
secret squirrel may get run over by a G wagon soon (he does look here, he just doesn't post).
Peter.

droopypete wrote:Also Greg, I would think that with all these posts about 1.6's,
secret squirrel may get run over by a G wagon soon (he does look here, he just doesn't post).
Peter.

You're just trying to cover yourself because you let the cat out of the bag pete

Besides - the new motor is going to go in the mazda, not my car

greg wrote:

droopypete wrote:Also Greg, I would think that with all these posts about 1.6's,
secret squirrel may get run over by a G wagon soon (he does look here, he just doesn't post).
Peter.

You're just trying to cover yourself because you let the cat out of the bag pete

Besides - the new motor is going to go in the mazda, not my car

Don't taunt me Greg or will spill the beans on Yahoo.

besides if you put the new moter in the Mazdabater, you can then put the Mazda moter in your zook, easy.
Peter.

droopypete wrote:Don't taunt me Greg or will spill the beans on Yahoo.

besides if you put the new moter in the Mazdabater, you can then put the Mazda moter in your zook, easy.
Peter.

Auto and front wheel drive suzuki =

I've driven a few setups, 1.3 carb with 4-1 extractors, cat and 2" system. Good up high, LOUD and you do notice the torque loss down low.

Currently my EFI 1600 has tri-Y extractors no cat (shh ) 2" mandrel pipe and a straight thru muffler. I'm pretty happy with this setup, though i would be interested to see what difference a 1 3/4" and 1 7/8" tail pipe would make.

I found that Genie extractors, & a 2" pipe with turbo muffler works great on the g/f's 1.6 carb Vit.

She esp likes the exhaust note!!