Thread: 13.8 MPG! wow....

Ok , Ill go out and take a look Cant i just take the o2 sensor out and hook it to 12v to see if its still working?

I only have 1 o2 sensor, so ill just replace it and hopefully that fixes the problem

Yea I replaced the o2, cleaned the maf, replaced air filter . Still 15 mpg -_-

Sent from my Evo

Update :
Had a super bad ypipe leak typical pacesetter problems, testing the mpg as we speak, will update soon, if this didn't fix it I'm going to be heated lol

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Originally Posted by tylerbinski

I ran both for a couple months- seemed more responsive and wasnt hard to tune with wide band.

i wouldn't sell a car with SD OL wothout the buyer knowing as the tune is highly sensitive to atmospheric conditions and needs close monitoring.

Meh, my buddy recently moved to Colorado with his open loop NIC car... Works fine.

Originally Posted by darkhorizon

Meh, my buddy recently moved to Colorado with his open loop NIC car... Works fine.

I've seen comparisons of MAF and SD calcs on a V8 PCM.

It seems they were both as accurate, but the MAF had more outliers.

Flexibility of the SD tune would depend on its accuracy.

Originally Posted by matt5112

I've seen comparisons of MAF and SD calcs on a V8 PCM.

It seems they were both as accurate, but the MAF had more outliers.

Flexibility of the SD tune would depend on its accuracy.

Who is talking about speed density.... I have only heard of one guy actually trying to run his naturally asperated car on SD mode full time.

Originally Posted by darkhorizon

Who is talking about speed density.... I have only heard of one guy actually trying to run his naturally asperated car on SD mode full time.

Good point.

However I can only think of two reasons you'd want to run open loop though.

Lean cruise or by-pass MAF.

Honestly, we have to see the tune that's on the car and what the DTC is to pass judgement. If the car is in otherwise good working order... i.e. headers don't leak, no vacuum leaks, then I would cover maintenance basics. If the plugs and wires are original then get some new delco wires and Autolite 104's and set the gap to .055. If the tune is anything like ZZP's, the power enrich TPS enable could be set really low like 30% across the board. I raised my PE TPS enable back up to stock because it was going in to PE way too often when it was unnecessary.

You can compensate for that via the TPS adder.

Originally Posted by matt5112

Good point.

However I can only think of two reasons you'd want to run open loop though.

Lean cruise or by-pass MAF.

You can run in sorta closed loop in SD mode though.... The few SD LSx cars I have tuned pretty much need to have a narrowband helping them out for cold/hot stuff unless you really play with dialing in the tune.... Even then I had problems.

Gas mpg is. Still bad, actually a little worse than before with the exhaust all sealed up now, i do not Still have a rear o2

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I was getting 80mpg for a half tank, got 67 this time

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Did you unhook the battery for an extended period of time?

Dark horizon yes I did for about a half hour

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