Jay Gadsby Posted October 29, 2015 Share Posted October 29, 2015 Sounds to me like you need some custom tailored tuning for your car and not an off the shelf tune. Something is wrong in there. My Titan had better mileage than that and lugging around twice the vehicle for the sameish HP (319rwhp). Quote Link to comment Share on other sites More sharing options...
Phantom Posted October 29, 2015 Share Posted October 29, 2015 Oops - sorry - didn't mean to sound like a smart A. I used to drive 17 miles each way to work - mostly interstate with maybe 3 miles of surface roads. I averaged 18-20 doing that. Engine temperature sensor not working right? Plugs should tell the story. Are you geared similar to me? Quote Link to comment Share on other sites More sharing options...
CableSrv Posted October 29, 2015 Author Share Posted October 29, 2015 I'm still on the stock R180 that came with the car. Plugs don't looked fouled at all. Engine temps are normal at around 210F. One of my plug wires seemed a little loose but doesn't seem to change how the engine sounds. Either way I pushed it further in to make sure it was a solid connection. Exhaust still smells super rich Sadly I don't have the money currently to do a full on tune. Quote Link to comment Share on other sites More sharing options...
CableSrv Posted October 29, 2015 Author Share Posted October 29, 2015 Checked with my obdII bluetooth sensor and still only running that one fault code for crank sensor relearn. Other than that everything looks normal. It shows it is running in close loop mode using O2 sensors for fuel trim. O2's are running anywhere from .1v to .8v Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted October 29, 2015 Share Posted October 29, 2015 Almost 100% of my Z driving is at threshold traction in acceleration and at threshold traction in deceleration, excluding trailer loading, which is on the winch. The truck is either city driving or towing. I just know that my mileage is crap. I burned a full tank of gas during ZCON. I usually burn a full tank at a night at the strip. Quote Link to comment Share on other sites More sharing options...
grayson260z Posted November 1, 2015 Share Posted November 1, 2015 Wow just read through this entire thread. Awesome read hope all is going well! About to embark on a 5.3/t56 swap in my early 260z Quote Link to comment Share on other sites More sharing options...
grayson260z Posted November 1, 2015 Share Posted November 1, 2015 Also could I ask how the stock r180 is holding up to the power? I don't really want to invest into crazy diff upgrades if it isn't really necessary Quote Link to comment Share on other sites More sharing options...
CableSrv Posted November 1, 2015 Author Share Posted November 1, 2015 so far so good, but it could be because I'm using 195 tires that are easy to burn out rather than put strain on the rear end. Quote Link to comment Share on other sites More sharing options...
mistafosta Posted November 2, 2015 Share Posted November 2, 2015 So been driving her for a bit and there seems to be a rather big issue. I'm getting maybe 9-10mpg on this engine. The only code being thrown last I checked was the crank relearn code since I put a 99+ pcm on a 98 engine. LS1Tech said this code would not put the engine in limp mode... but why am I getting such shitty mpg ? Cannot stress this enough, but you need a quality tune. A crappy tune will cause terrible mileage and a myriad of other issues, and oftentimes they turn off the CELs that would normally turn on as a result. Get it tuned on a dyno and street by a competent local tuner, and you will see a ton of difference. Quote Link to comment Share on other sites More sharing options...
CableSrv Posted November 2, 2015 Author Share Posted November 2, 2015 Even to a stock engine? I mean really the only mods to the car are 3in exhaust and cold air intake from JTR. I just assumed that a stock tune shouldn't be this bad. Quote Link to comment Share on other sites More sharing options...
mistafosta Posted November 2, 2015 Share Posted November 2, 2015 Even to a stock engine? I mean really the only mods to the car are 3in exhaust and cold air intake from JTR. I just assumed that a stock tune shouldn't be this bad. Even on a stock engine. Weight is different, exhaust/intake are totally different, and you have all the smog stuff removed. Car needs a tune without question. It may not be the only source of your bad gas mileage but I'm willing to bet its a large part of it. Quote Link to comment Share on other sites More sharing options...
CableSrv Posted November 2, 2015 Author Share Posted November 2, 2015 ugh.. that's like another 500 bucks to spend Quote Link to comment Share on other sites More sharing options...
Phantom Posted November 2, 2015 Share Posted November 2, 2015 (edited) Unless you kept the catalytic converters and all four O2 sensors you already need to have the PCM retuned. That was where they started with mine as I only kept the front two O2 sensors and deleted the cats and the rear sensors. The weight, gearing, etc is not a huge issue - especially since a dyno tune won't be sensing the weight of the car - just the result of the gearing. At some point your R180 half shaft universal joints are going to detonate on you - even with the 195 tires. I detonated one of my R200 half shaft u-joints several years ago. It had over 200k miles on it by then though. A full dyno tune will properly map your engine. It will also identify any issues you may be having - like an incorrect signal from your engine temperature sensor. It could be continually sending an "I'm cold" signal which wouldn't necessarily send a fault code but would have you running in a "choke" mode all the time. I've been running on a tune from an ECU tuner for 12 years now and the car is doing pretty well but I've found a really good LS1 tuner over in Vancouver, WA and I'm planning on taking the car over to him to have a full dyno tune on it. I know $500 is rich but, if you're running too rich you'll be washing down your cylinder walls with unburned fuel and the results of that will end up being a lot more than $500. Edited November 2, 2015 by Phantom Quote Link to comment Share on other sites More sharing options...
CableSrv Posted November 3, 2015 Author Share Posted November 3, 2015 Phantom using my bluetooth obdII reader, it shows that it's running in closed loop mode which should be normal o2 sensors for fuel map. I only kept the front 2 o2 sensors so, I can see how removing the egr and cats could cause some fuel readings to be off... just didn't expect it to be this bad.I know, just wasn't expecting that as a requirement to getting this installed and running. I always attributed it to a "get more hp thing" rather than help fix fuel efficiency issue. Considering when I get this done, I'll probably end up gaining some HP/TQ which as you put it, will eventually cause my u-joints to shatter. At some point in my future, I do plan to do cv's and a R200 with lsd. Quote Link to comment Share on other sites More sharing options...
Stock Car Mafia Posted November 3, 2015 Share Posted November 3, 2015 Cable I think they're may be a tuning issue based on what your driving habits are. Quote Link to comment Share on other sites More sharing options...
CableSrv Posted November 3, 2015 Author Share Posted November 3, 2015 That's what everyone seems to be pointing too. So looks like saving up to get a tune done. Quote Link to comment Share on other sites More sharing options...
Stock Car Mafia Posted November 5, 2015 Share Posted November 5, 2015 Is there anyone that could email you their tune file that are running close to what you have in your car? If they could delete the rear o2 sensors I think you'd be set. I had a couple cbr liter bikes where I was able to swap tunes, even with slightly different mods and they both ran fine. Quote Link to comment Share on other sites More sharing options...
CableSrv Posted November 5, 2015 Author Share Posted November 5, 2015 I don't have the rear o2 sensors. Those were deleted from the pcm when I had the harness made. Chevythunder gave me a stock tune, minus vats, and all the egr stuff. Quote Link to comment Share on other sites More sharing options...
EastTnZ Posted November 5, 2015 Share Posted November 5, 2015 I had a code pop up that i had to get tuned out so I went with a mail order tune from tunedbyfrost for high octane and it runs great! More hp too! I get around 30 mpg cruising on the interstate/highways. Quote Link to comment Share on other sites More sharing options...
CableSrv Posted November 5, 2015 Author Share Posted November 5, 2015 how does a mail order tune work? do you mail in your pcm and he updates it and then mails it back? Quote Link to comment Share on other sites More sharing options...
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