catback exhaust and higher oil temp
some days ago i got my catback exhaust installed.
great sound which fits the car very much but..... i have oil temps which i never had before. even during driving in the city with low speed its going up to 90 very fast. driving on german highways (which dont have speed limits in some areas) with high speed is pushing temp up to almost 120 within some kilometers and i have to slow down. i never had this before. with original exhaust and travelling with 240 km/h on german autobahn temp went never higher than 110 / 115 even after long distances. asking the manufacturer of the exhaust system doesnt help. they have no glue and didnt have similar problems with other cars. anybody here who could give me a advice what this can be? how come a catback exhaust can change the oil temp in such a big way? i am happy for any messages from you. thomas |
What brand of exhaust and have you changed your oil recently?
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hi, its a small company in germany which is making this ones. ff- autotechnik, you will not know them in the States. last oil change is some 10.000 km ago. whats surprising is really from the day i have the exhaust the oil temps jumped. i guess nothing to do with oil. |
Higher combustion temperatures due to running lean could produce more heat.
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no fun to drive like this |
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Did they replace the stock catalytic converters? That could theoretically change the air fuel ratio but another could just be higher ambient temperatures as it is currently summer which makes a difference.
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cataliytic converter still original. they didnt change. Weather cant be the reason. just imagine you drive saturday morning to L.A. to change your exhaust system. you drive back after some hours in the same weather conditions and the same speed.............. but your oil temp is now arround 250 and was 210 some hours ago. thats what happend to me. |
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to correct the AFR ratio ?! doest it mean to reflash the ECU? |
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Have you tried ECU reset? Might help. Also is your oil at the top? Could help a little bit. Yes, between low and high might be around 0,5l of oil, but it could make a difference. This helped to my TT 2.0TFSI in hot summer for running it cooler.
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Of course you are right, higher speed and higher rpms causing higher engine temp. But already after 5 miles? I dont think so. Before i could drive 240 km/h for many many miles. Frankfurt direction border of france is a nice and free autobahn. I could drive there before long distances with full speed and temps not goinger higher than 210. Some days after the exhaust change i drive there again and i needed to slow down after 5 miles of driving fast, because i was affraid to go into limp mode. |
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Oil level was the first i checked but pretty good like it has to be. |
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I just dont hope its because of the exhaust design.
The manufacturer is doing this everything individual and lets say "handmade". Our original system is a dual line pipe. This one which i have is now a single line with a diameter of 75 cm. The original one has to lines with each arround 52 cm. I dont hope its the diameter and the flow of gas which is causing this issue. |
The volume of the 75mm single is slightly larger than the dual 52mm provided there is no choke point.
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Thank you guys for your friendly advices!
I will try to do ecu reset with the "everything about timing" method. Will see if there is a change. Same time i am serious thinking about a oil cooler. Looks like many of you did it already. Thank you! Tom |
Hi to Germany. Hope, that ECU reset will help! Don't know how important it is in NA engine, but if is backpressure in FI (mostly turbo), it could cause some problems. Same issues had many TTs with installed 3" downpipes instead 2,5" :eek:
Also, what gasoline you pumped in? It might look pointless, but if the fuel doesn't have good enough anti knock value (RON) it could also increase engine temp! So if you stopped for fuel recently before your issues, it might be caused by it. Know, that fuel in Germany is better than in our postsoviet country, where even Shell has different fuel to same labeled in Germany, but mistakes happen and it could be changed by gas station personal. BTW: where are you actually from Germany? Want to go to Eibsee (for that Porsche route, which is stunning), or Neuschwanstein. Any recommandation? |
I was out on a run tonight for about 15 minutes of on ramps and off ramps. Shifting in the 5k to 6K range. The car hit 240F with ambient air temp of 75F. CNT catback Exhaust and test pipes are on the car now. Looks like an oil cooler is in the budget after the uprev tune.
Not sure if they are related, but I don't remember hitting that temp so fast. |
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hi, know quality of fuel is a important point with this car but i dont think its connected with the problem i have. i was living and working in cz for some years so i visit your country from time to time. i take OMV carrera fuel. i dont know how much octane it has but i can tell you, my car was never running faster than after taking this fuel. |
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right ! it must have something to do with the exhaust. i had a friend here to check this. he is a former mechanic of zakspeed formula one team. i guy who knows a lot about engines. he told me, of course the diameter and the design of exhaust systems causing higher temp and of course a different power output - which is not always higher. a wrong system - design can make your car less powerful. i am really disappointed and thinking to change the exhaust for a different one or go back to oem. |
Just make sure it is 98 octane or higher (RON/ROR/ROZ).
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What could be aftermarket exhaust is that O2 sensors are reading values, that is causing ECU is trying to enhance A/F ratio and with more too much fuel or too low could cause this.
Dad had same issue 10 years ago on VQ20ER engine. In 25 000kms were catalytic converter burned also with headers and gaskets :mad: If you come to Czech, let me know if you are interested to make CZ/DE 370Z meeting :bowrofl: |
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