05-26-2015, 04:11 AM | #200 |
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Flash tunes really begin to take off now. N55.
GSR (F30 335i 91 AKI) and ESS Tuning (M235i 91 AKI)
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M135i 8AT PWG, MHD, Pure Stage2, WMI via Torqbyte CM5-LT, Custom tuned by PureBoost
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07-21-2015, 03:40 AM | #202 |
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I'm thinking about ECU tuning my 116i but since 118i has slightly bigger diameter in exhaust (catback) I was wondering that should I change the exhaust to supersprint etc. I'm not sure if the stock exhaust restricts the power gained from ECU tuning?
Also does it matter that if I tune my car without the new exhaust system or should install the exhaust system before I go? |
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07-23-2015, 07:01 AM | #203 |
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If you are going for a custom tune, it will be good to have all hardware done up before the ECU flash.
Also, if you have a sport cat exhaust and upgraded intercooler, it will be a stage 2 tune with higher gains. |
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07-23-2015, 11:56 AM | #204 | |
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Current: 2018 X1 F48 & 2014 F20 116i. Before: 2009 BMW E90 320d LCI, 2008 E92 M3 &
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07-24-2015, 02:13 AM | #205 |
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I was thinking about the catback because 116i and 118i have the same downpipe but different radius piping. I'm going for only stage one tune so maybe the stock exhaust is enough for me.
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07-24-2015, 01:57 PM | #206 |
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08-02-2015, 01:36 PM | #209 |
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Hi guys,
I like to share my experience with you about my 116i(2014,zf-autobox -with BR-Performance). My car does great. I'm running the tune for about 15.000km now. Did a wintersport holiday with it with 4 people(really pushed it on that trip), run the Stelvio pass and Futa pass with temperatures around 35-40 degrees and the car runs great in every condition. Small summary: - Running best on 98 - The power delivery is more smooth, and even beter with German 102 petrol. - Consumption is comparable with a standard 116i/118i and depends on speed/conditions - water and oil temperatures are the same as standard(not tuned 116i) - My car hasn't got a increased oil usages. What I like to fix: - Trottle release - small after kick after high booster pressure - Exhaust sound - Quiet a boring soundtrack - mainly "sssssttttt" when you hit the gas. - Maybe some more low rpm torque for smoother gear changes in town (like a 125i of 320i) How fast is it? Said to say but in Holland we haven't got good competition. I think it's as fast a standard MK7 GTI, BMW 328i sedan (On the autobahn I did keep up with on) a Seat Leon Cupra. My car has a autobox with has great traction of the line. I do a GPS measured 0-100kmh in 6.0 sec and 400m sprint in 14.21 sec (Renault RS APP) Had some fun with a 435i (convertible) on the german autobahn. How many times do i use my extra powerfull 116i? 90% of the time i just use the extra torque and don't rev higher than 4000rpm. On occasion i take a sprint out of a corner or something like that. I highly recommend BR-Performance. Didn't know the company before the tuning, but they did a great job and have done great in after sales support. |
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07-11-2016, 02:37 AM | #212 |
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My thoughts on the ECU fun,
Own a late MY14 116i. Had the ECU done to superchips. At first 3 days, i had a catastrophic engine malfunction which resulted in a complete change of the engine. The reason was low octane (despite the 98 writing on the pump) and a failing sparkplug. After the engine change, i installed Denso sparkplugs. The car "coughed" during take-off so changed to NGK sparkplugs. The car is running great since than (more than 5k KM's so far with the ECU Tune and approximately 7-8k KM after the new engine). The car is Stage 2 with custom exhaust system (made for the safety reasons following the engine change). The car pulls great and does not stop pulling at all. I did once a 260km/h+ run with 4 people and their luggage onboard (even the Superchips rep could not believe the speed i achieved ). The road was a bit sloped i admit and ofcourse was empty After that pull i had the car dropped 10 bhp due to safety precautions (engines are expensive! ). The only drawback i have experienced so far is from the exhaust system. It somewhat killed the lower rpm torque (or my buttdyno needs a reboot ). I will have the stock system installed to check if i am correct. I did not do any GPS runs but the car is damn fast. I can keep up with 3.28i's, 525d's, A3's, Porsche Cayman S', Scirocco R (my friend said he did on my car) and the list goes on. So far so happy with the results. Next time i will try BR performance with the new addition. |
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07-11-2016, 03:05 AM | #213 |
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If the car can do 210 km/h with 136 hp, it would need around 258 hp to do 260 km/h. In reality, I think the car needs a bit more than 136 hp to do 210, and even more than 258 hp to do 260 km/h.
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07-11-2016, 03:52 AM | #214 | |
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I know people doing 250+ on their stock 316i pre-lci with only the stage 2 piggyback box on a loong loong straight (the speed limitor was canceled within the first 10 hours of the collection of the car via the coding). Also, according to your calculation, the car needs almost 1bhp for 1 km/h beyond 136bhp which does not seem to be "logical" in terms of efficiency and does not fit in the engine volume-bhp-top speed correlation. An engine is mechanically limited to a top speed and the bhp (given the circumstances that it is not too low to limit the top speed) only changes the time it takes to reach that given mechanical top speed. 1.4tsi engines of Audi A3 can do pretty high top speeds with Revo kits giving 210-225 bhp (revo technik). That is why the Porsche Cayenne Turbo S with higher bhp was losing to VW Touareg V10 TDI in terms of top speed. When you add the slight slope i had and the cold air at the fall, you can see how i achieved the speed (even the Supersprint rep has told me they had cars close to 260km/h if not 260+ without any slope and they were surprized as well). Long words short, that is what i have done without any of the above explanations and i do still believe that the car has capability to do even higher top speeds if a higher bhp is given or if you find a long enough straight road. Last edited by Slyly; 07-11-2016 at 04:11 AM.. Reason: Given further explanation and corrected a meaning |
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07-11-2016, 04:08 AM | #215 |
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Yes, running downhill helps a lot. I just wanted to point out how much power you need to do so on a flat ground. The F20 has aero drag like a brick. The 3 series can go faster with the same power.
If you look at the physics involved, the rolling resistance is proportional with speed, and rather negligible when it comes to top speed. The aero drag increases with velocity squared, and the power needed to overcome it increases with velocity cubed. That is what I based my calculation on. Our 116i had 139 hp at the rear hubs on a dyno run, which indicates something like 150 hp in the engine. Still I never managed to go beyond 209 km/h (GPS) at flat parts of the Autobahn. I know there is a limiter, but I could tell by the almost non existant acceleration above 200 km/h, that the car was actually running out of power needed to go faster. Removing the limiter would only help when going downhill. I managed 219 km/h in my old E30 318iS with the same power output by drafting behind a faster car. The E30 has slightly less aero drag as well, due to significantly smaller front area. |
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07-11-2016, 04:13 AM | #216 | |
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07-11-2016, 05:24 AM | #217 |
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07-11-2016, 05:46 AM | #218 | |
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Will google GPS speed measurement and will see what i come up with. I may get one and try it on a straight road. It is 10 bhp less but i don't think it would matter a lot. By the way, i have checked the drag coefficient of the F20 (0,31) and it is the same with LFA (0,31) as the result of my research shows. It is not a brick like aerodynamic. Previous M3 was 0,32. |
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07-11-2016, 06:12 AM | #219 |
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The drag coefficient on the F20 varies from 0.31 to 0.33, depending on engine and wheels. This is a rather high value by modern standards. The three series har 0.26-0.29. A new Golf typically 0.27. A Toyota Prius has 0.24.
But the frontal area is also a factor. Compared to older BMWs, the modern cars have grown very wide, which adds to the drag. That is why the F20 has more aero drag than the E30, even when the coefficient is lower. |
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07-11-2016, 06:18 AM | #220 | |
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The speed i achieved was not confirmed by a GPS but was by the onboard tachometer. Again i am up to test the car to the top speed when i find a usable GPS meter and conditions (it is too hot at the moment for the turbo to spool efficiently with cold enough air) and lots of "holiday" traffic. Than i will try it on a straight road as well (if i can find a few KM's long one). |
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