08-14-2016, 09:52 AM | #1 |
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vBox acceleration baseline numbers for stock i8
I haven't had this car very long. Have only driven it 100 miles. But I wanted to see what it was capable of in stock form so I went out and did some vBox runs. Conditions were 70 deg F and 90% humidity, sunny/hazy as fog just lifted. Slight downslope around -1.0 degrees. Car had a full tank of gas and battery was nearly fully charged.
I'm not the greatest driver on earth but I have done quite a bit of vBox testing on my other cars. Here's the results of three runs. Two 1/4 mile passes and one 60-130mph pass. First 1/4 mile brake boosting: 0-60 mph 4.466 seconds 1/8 mile 8.341 @ 88.867 mph 1/4 mile 12.741 @ 112.174 mph Second 1/4 mile WOT off idle: 0-60 mph 4.680 seconds 1/8 mile 8.577 @ 88.851 mph 1/4 mile 12.977 @ 112.236 mph 60-130 pass: 12.928 seconds Doesn't come close to the magazine times which may mean that a car with 100 miles needs further break-in, or that I need more seat time or both. Also could mean that BMW loads its press cars with a more powerful tune to get the stats of 0-60 in under 4 seconds and 1/4 mile in the 12.2 @ 116 range. I'm thinking a flash tune will be necessary to get these stats. For now I'm gonna drive it as is and see if it gets quicker with more time/miles. But I will likely flash tune it once more options/development has been done. Not sure I want to be a guinea pig on a new platform.
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08-14-2016, 03:01 PM | #2 | |
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And then, just my two cents worth: I would properly break in the car before trying something like this. There's a thread on here "i8 Engine - Initial Running and Conditioning Period" that talks about 1200 miles to break in the ICE. Just to be on the safe side, I tried to follow that, although it's a guess how far you've actually driven the ICE in an i8. The car doesn't give you the break-down. You can sort of work it out by fuel consumption. |
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08-14-2016, 03:19 PM | #3 | ||
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Modern engines are broken in from the factory. My e92 M3 was dyno'd with 91 octane with less than 300 miles on it and still holds the record for highest dyno hp for that platform. Hell at 4 miles on it I drifted the thing out of the dealer lot when I picked it up lol. Also I ran my tuned 991 Turbo S with 500 miles in it and it did a 6.65 second 60-130 mph run on the exact stretch of road I did the testing today for my i8, and is still a record run for a tune-only 991. So I don't believe that a modern car will make more power with more miles on it.
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08-14-2016, 05:06 PM | #4 | |||
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There are two different beliefs about breaking in a car. One is to follow the suggested manufacturer breaking in period. The other is to bribe it from start like a bat out of hell. And some do use this approach. But you're wrong about all modern cars. Some modern cars do still have to breakin as suggested by the manufacturer. Not 100% sure about the i8, but considering it is a hybrid, I would follow the suggested breaking in period because of the battery and electric motor as it adds more unknowns to the equation. Perhaps in 1000 miles or so you can do another test and see if the results change.
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08-14-2016, 08:17 PM | #5 |
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You are right Phoenix I don't know conclusively if all modern car motors are broken in from the factory, but this was my conclusion after doing some research a few years ago. One thing that I do for certain is make sure the oil temp is at normal operating temp before flooring the car. Which is a bit hard to do in this car without an oil temp guage.
Yeah after I get a few more miles on the car I'll give it another shot and will also try launch control.
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08-15-2016, 05:49 AM | #6 | |
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All current manufacturers, incl. Porsche and BMW still tell you to take it easy on the revs for the first 1000 miles or so. They do not let the freshly assembled engine run for hours and hours at the factory. Sure, a modern engine will perform right off the showroom. But combustion engines have so many moving parts, and at great force - especially in high-performance setups - that I think running them in a bit is just a fair thing to do for the materials. |
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08-17-2016, 11:38 AM | #7 | |
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08-19-2016, 05:08 PM | #8 |
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One thing I failed to mention was how disappointing the brakes are at triple digits. At 130mph, there is a weird pulsation in the pedal I assume from the regen feature. Takes forever to slow the car down. No wonder why the Formula E pace car features AP racing brakes.
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09-11-2016, 09:53 AM | #9 |
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Another update. At now close to 1,000 miles on the odometer the car doesn't feel any faster. I have put 2 more tanks of gas and I'm using the highest octane we have here in California (91).
One note - my accel test above was done with all the nannies on and of course no launch control. I have since found "sports traction" which I drive in now. Not complete DSC off but it's the quick push of DSC. Holding it down for a longer period turns it completely off. I'm finding the car does launch better in Sports Traction mode. So I'm confident that the car can produce some quicker times but doubt the terminal 1/4 mile speed or the 60-130 will be any better. Plus the brakes suck sooo bad I wouldn't want to try another 60-130 ever again unless I could coast down to double-digit speeds before applying the brakes. The torque is plentiful in this car. If I was to get a tune, it would have to be one that provides a boost profile that is linear with rpm - so the higher the rpm the higher the boost. Because that's where this car needs the additional power. More torque in the mid range will not help anything.
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09-11-2016, 12:10 PM | #10 | |
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09-11-2016, 12:47 PM | #11 |
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I typically drive with "traction control" off. I don't have a VBOX or real data behind the claim, but I feel like I rarely or never get the launch bog with it off. I'm wondering if the traction control is so sensitive that it causes the slight hesitation from a stop.
Launches also seem more predictable/quicker in manual mode, but I know LC requires you to remain in Sport. But for daily, it seems to be the best combination. From what I remember, some magazines were claiming sub 4 second with LC on (but it was probably with a gallon of gas, down wind). |
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09-11-2016, 02:45 PM | #13 | ||
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09-11-2016, 04:22 PM | #14 | |||
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09-11-2016, 07:55 PM | #15 | |
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In my view modern day engines are already broken in an ready to go.
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09-11-2016, 09:11 PM | #16 |
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I look forward to hearing what your times are when you enable and use launch control. Until then I don't think we're going to get anything significant. While the car may not feel any different than it did when you tried it without launch control 900 miles ago on the odometer, I'm not sure that means anything, either.
I'm not trying to be rude, but when BMW says launch control is what you need to get the times it publishes, I think it's a good idea to follow the directions to see what times you can get.
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09-12-2016, 06:25 PM | #17 | |
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09-12-2016, 06:26 PM | #18 | |
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09-12-2016, 06:32 PM | #19 | |
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You may believe what you wish, and you may do with your engines what you wish. The fact remains, no manufacturer lets the engines run or drives the new cars around for the equivalent of several hundred miles. Engines are built to better tolerances, but they are not run in when you get them. |
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09-12-2016, 07:22 PM | #20 | ||
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09-12-2016, 09:46 PM | #21 | ||
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Whether they are broken in an engine room or not and simply built to tighter tolerances I will continue to believe unequivocally that modern day engines can be pounded on from the moment they leave the manufacturer.
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09-12-2016, 09:48 PM | #22 | |||
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