hpfmnst Member 57 Member For: 9y 6m 19d Posted 28/06/15 04:26 AM Share Posted 28/06/15 04:26 AM Hi everyone! Bought 2008 fg xr6t not long ago with upgraded injectors, hi-flow fuel pump, hi-flow catalytic converter and bigger intercooler. Now, after driving car for a while, I realised it drinks 98 octane fuel like there's no tomorrow. I would get little over 300 km out of a tank in urban/hwy drive. I changed spark plugs with denso iridium ones and it stayed the same. Car has done 110k and old spark plugs were black, clearly indicating that car was running rich all the time. Then, my attention turned to coolant temperature. The coolant gauge was sitting about 1/4 on temperature scale most of the times and I started suspecting it is thermostat. Finally today decided to replace it. Bought new hi-flow xr6t thermostat from SCA and it opens at 91°C. When I pulled one that was installed there it was 71°C. That explains why car was running rich all the time, since it couldn't get out of warm up loop. Exhaust was all black and I think if I continued to drive like that I could've done damage to cat converter. Temperature was too low. Now, with new thermostat, temperature needle sits just under half on the scale. But now fans are running all the time once car reaches operating temperature of 91°C ! Question. How do I adjust when fans cut in? I understand that tune might have been done, but car was using way too much fuel and obviously dumping unburnt fuel down the exhaust. Is it possible to adjust fans manually at all, or do I need to find a tuning place to adjust fans for standard thermostat. Appreciate your help with this as I realised reading through different topics on this forum that there are some super knowledgeable people here.Sent from my SM-G900I using Tapatalk Link to comment Share on other sites More sharing options...
bamk2f6tornado Bronze Donating Members 777 Member For: 10y 11m 25d Gender: Male Location: Rockhampton Qld Posted 28/06/15 04:56 AM Share Posted 28/06/15 04:56 AM Tuner can adjust when the fans come on Link to comment Share on other sites More sharing options...
hpfmnst Member 57 Member For: 9y 6m 19d Posted 28/06/15 05:01 AM Author Share Posted 28/06/15 05:01 AM Thought so.. Just wanted to see whether there's other way. What thermostat is everyone else running? Sent from my SM-G900I using Tapatalk Link to comment Share on other sites More sharing options...
EvilDaifu Cruise Whore Moderating Team 5,130 Member For: 19y 3m 23d Gender: Male Location: Melbourne Posted 28/06/15 05:27 AM Share Posted 28/06/15 05:27 AM Pitlane adjusted my thermostat to come on a bit sooner - my fan runs most of the time. Link to comment Share on other sites More sharing options...
bamk2f6tornado Bronze Donating Members 777 Member For: 10y 11m 25d Gender: Male Location: Rockhampton Qld Posted 28/06/15 05:50 AM Share Posted 28/06/15 05:50 AM Standard Link to comment Share on other sites More sharing options...
hpfmnst Member 57 Member For: 9y 6m 19d Posted 28/06/15 07:04 AM Author Share Posted 28/06/15 07:04 AM Even with modifications, I think you're better of keeping standard operating temperature, since lot of modern oil additives start working at 90° and engine has been engineered from ground up to work at this temperature. Personally don't think it is worth extra few kilowatts if engine burns more fuel than necessary and also risking damage to catalytic converter. Sent from my SM-G900I using Tapatalk Link to comment Share on other sites More sharing options...
julesk_1972 Member 267 Member For: 12y 4m 3d Gender: Male Location: Perth Posted 28/06/15 07:11 AM Share Posted 28/06/15 07:11 AM Pretty sure if tuned correctly using an 82deg thermostat the consumption is ok.Well mine is at 398rwkw on 98.Oil will be hotter than coolant temperature so moot point with oil additives.Sent from my HTC One_M8 using Tapatalk Link to comment Share on other sites More sharing options...
ratter Member 6,793 Member For: 18y 6m 1d Gender: Male Location: @ my laptop Posted 28/06/15 11:57 AM Share Posted 28/06/15 11:57 AM hotter thermostats do produce better fuel economy no matter who or how it is tuned, colder help keep under bonnet temps down and useful when good intercoolers are not used.Modern oils do need a minimum temp for the additives to start to work and give the protection you pay for with the oil, running too low coolant temp can keep the oil temp down as well 3 Link to comment Share on other sites More sharing options...
julesk_1972 Member 267 Member For: 12y 4m 3d Gender: Male Location: Perth Posted 28/06/15 03:20 PM Share Posted 28/06/15 03:20 PM hotter thermostats do produce better fuel economy no matter who or how it is tuned, colder help keep under bonnet temps down and useful when good intercoolers are not used.Modern oils do need a minimum temp for the additives to start to work and give the protection you pay for with the oil, running too low coolant temp can keep the oil temp down as wellVery generic statements.Sure hope the minimum oil temp for additives to work includes cold starts. 1 Link to comment Share on other sites More sharing options...
ratter Member 6,793 Member For: 18y 6m 1d Gender: Male Location: @ my laptop Posted 28/06/15 10:14 PM Share Posted 28/06/15 10:14 PM Generic statements?Why?Because it does not agree with what you posted?do you have any factual information to add or just the stuff you already posted? Link to comment Share on other sites More sharing options...
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