I am installing a pacesetter header kit on a '99 sl2 and want to flange in a straight thru resonator inplace of the cat. Does anyone have any ideas for a simulation O2 sensor device that emulates the output readings from the cat exit. I simply need to fool the ECU to not throw a SES code with this setup. If i have a schematic... i can build it.
other related engine mods... _large bore Throttle Body _intake tube & cone filter.
no oil burn @135k.
Rob
Hmmm yes, break the law, choke the enviroment, gain 1hp.
What is this your daily driver? May I ask what is the point in doing any of this? I doubt your engine moves enough air for that cat to be restrictive and any gains would be negligible.
I always thought 4 cylinders were for fuel economy, not to sound pretty...
My 2 cents, mean as it may sound. :-|
and not to mention buning your exhaust valve springs from lack of back pressure,also, it will probibly sound like dirt. Leave the cat in. 'Blah Blah' is right, the 1.9L (or any 4cly.) don't move enough air to get a gain, by removing the cat. It may even slow you down.
While Blah may be making a valid point in his own way, you might also check out SaturnSpot.com, SaturnFans.com and XtremeSaturn.com, all great places to find other extreme modders. Why not just use a catback system or a dual bypass system insyead of bypassing the cat anyways? You wont waste much HP going that route and if it is a daily driver a cat is a good idea anyways. On the other hand, if your SL is only for track use (ie: Moroso) and not to be used on the street, then no cat is understandable.
marx404
Even in the best of circumstances, the 1.9L Saturn engine isn't a very tunable engine. It's an economy car, not a sports car. Installing a test pipe probably won't get you any benefit at all, other than causing the computer to completely botch your fuel trim. On one extreme, that will hose your gas mileage. On the other extreme, you'll run lean and roach your engine. Is that what you want?
If you want a car to mod and fiddle with, get a tuner friendly car. There just isn't much available for the 1.9, and even the stuff that IS available isn't going to buy you much horsepower (but will definitely drain your wallet).
really now? While I said that I do agree that removing the cat for a streetable car isnt a good idea, hmm, perhaps we should quickly rush over to the aforementioned boards and warn all the 1.9 owners who have been doing this for years that they are not tunable and that there isn't much available for them ?
See ya at Moroso. Cheers!
marx404
Rob Deen wrote in news:Xns95319E91954C3rascal2enteryahooca@63.223.5.254:
Yes i could have been more specific on the app for this mod. Flanging both the cat and the resonator would make for a quick out/in swap for street/track environments. Without a code during performance runs may add minimal warning of other system malfuctions especially during these open-loop conditions. thx to all respective replys.
Rob
a straight thru resonator inplace of the cat. Does anyone have any ideas for a simulation O2 sensor device that emulates the output readings from the cat exit.
Unless the SES puts the car in limp mode, just drive with it on. If you're flanging the cat for a quick swap at the track, it shouldn't be a big thing. If you're considering running without a cat on a street car, please don't. The minimal gain isn't worth dirtying the air.
I have no cat on my race car (track only) also - but don't think it's going to gain you more than a horse or two. Saturn catalytic converters are not a substantial bottleneck and aren't very restrictive.
Why not do both if you can. Most of us do whatever we can to enjoy the cars we own.
Unless you can refer me to occurrences where you've witnessed or read about this, I'd consider this one of the many old-school V8 tales that doesn't really apply to today's 4 cylinder motors. I know a handful of people who race Saturns in some form or fashion, and those who have been running for years with an open header and no exhaust haven't experienced any valve-related problems. Every nut and bolt has probably worked its way loose from the racket and vibration though.
Sure it is. It may not be as easy to get a lot of horsepower out of it as others, but it has potential. There are people with turbo'd or nitrous fed S-Series motors with virtually stock internals running 250 to 300 horsepower. Many of them hang out at
Many feel that it's what you do with the car that makes it a sports car, not the kind of car it is.
than causing the computer to completely botch your fuel trim.
The factory PCM has no problem adjusting fuel/air to most intake/exhaust changes.
Whether people feel it is 'tuner friendly' or not, people continue to do some pretty neat things with Saturn cars:
Ok so you plan on keeping it legal for the street? Thats good, I dont mind saying what it takes to fool the computer then so long as its kept "legal". The O2 sensor is basically a mild battery. Its voltage goes from .1v to .9v depending on if its rich or lean exhaust passing over it. Since the sensor your wanting to fool is downstreem of the Cat it should give a consistent reading to show that the converter is cleaning the burnt gases. So therefor the downstreem O2 sensor should give a constant .5v when everythings good and warm. So what do you need to do? You need a device that you can plug in when racing that supplies a constant .5 volts.
I've owned *three* Saturns and have 25 years experience as a mechanic. The 1.9 isn't very tunable. You can get a few hp here and a few hp there, but that's the long and the short of it unless you want to tear into the engine and do cams/valves/pistons/porting/etc. And even then, the engine isn't going to respond to those changes as much as a number of more "tuner friendly" engines. Been there, done that. It wasn't worth the $$$ for the very small amount of horsepower gained.
I remember begging a number of manufacturers to produce supercharger applications for the 1.9L, but nobody was interested. These days, I drive a turbocharged Audi so I haven't spent a whole lot of time researching the 1.9L Saturn performance market, but a quick look at SPS and a few other sites didn't seem to indicate that things have changed much in the last few years (at least for the Saturn 1.9L).
Cheers,
Well for one 4 cylinders can never sound pretty as they can never lope. They always sound like chainsaws. I think the best sounding 4 cylinders are the ones you cant hear. Same goes for modern trucks with v8's with stock cams. People pull the mufflers out or put in flowmaster mufflers and all you get is a droning noise when going down the highway. The wrong kind of sounds are very irritating. If they arent to you then your probably the kind of person with bad music taste and the kind of person that likes those repetitive lyrics songs that go on forever. lol :P
Come to think of it I guess thats why people with fart pipes always seem to listen to rap.
Everything and anything has potential when you put Turbo's or Nitrous to it. 250 and 300 horse isnt nothing when you can buy a stock late model f-body making 325hp for what it would cost getting a 4 cylinder car anywhere near that level. Even the torque and longevity of the v8 would always be greater.
In that case my SSE bonneville that I had was a sports car. Compaired to a british sports car from the 60's it could out corner and out accelerate the best of them.
I think I would pick up a cheaper hobbie myself unless I was getting paid to do this kind of stuff...
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