09-18-2018, 05:49 PM | #23 | |
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09-18-2018, 07:49 PM | #24 |
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Thanks for the responses. Doing an ECU-only would be a waste of money for me, and despite Dinan's warranty and reputation, I would always be concerned I'm stressing the engine for 0.7 in the 1/4 if the above formula is accurate.
Best to go all the way like the gentlemen in that other thread who is documenting his mods. Last edited by Rosseau; 09-18-2018 at 07:53 PM.. Reason: typo |
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09-18-2018, 09:47 PM | #25 |
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They released the specs today for the Z4 M40i and it's B58 is said to produce 382 horsepower. Have to wonder how substantially different the Z4s B58 is or is it just tuned
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09-18-2018, 10:37 PM | #26 |
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47 whp won't add 6 mph to the trap. I wish it would, but it won't.
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09-18-2018, 11:03 PM | #27 |
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I actuallly re-checked estimates and realized I’d added 47kW instead of 47WHP, will be closer to 4mph. Oh for everyone using SI units, makes calculations so much easier and removes the need for conversion and consequent risk of error.
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09-19-2018, 12:18 AM | #28 | |
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And unless it's a lot heavier than the overweight 2019 M240i xdrive (at 3600 lbs), it's gonna run a helluva lot quicker than 4.4 to 60, eh? And while I'm on-topic, that M240i has the cheapest, most poorly angled and generally *hitiest rear "coat hanger" of any auto I've driven in 45 years. Ya listenin' BMW? And that VANOS system had better never ever need changin' |
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09-19-2018, 12:42 AM | #29 |
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09-19-2018, 01:13 AM | #31 |
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09-19-2018, 09:25 AM | #35 |
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Peak torque rpm and peak hp rpm are different.
It will not have 369 lb ft at peak hp rpm. FYI, B58 in X3 M40i is rated at 355hp and 369 lb ft torque. For sure, 2 series interior is cheap. No sliding sun visor..... |
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09-19-2018, 10:38 AM | #36 |
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there is no way possible 47whp lowers .7 seconds.
30whp = .2 and 2-3 mph in trap.
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09-19-2018, 11:43 AM | #37 |
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09-19-2018, 02:31 PM | #38 |
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It really depends on where and how this 47whp is gained. Is it 47whp across the entire powerband (ie. 4500rpms to redline) or is 47whp across just a small portion of the powerband or not even in the powerband?
47whp across the entire powerband could get you .4-.5 seconds and 4-5mph in the 1/4 mile assuming a 3,000-4,000lb car and appropriate gearing. 47whp over the span of 1,000rpm or less of the powerband won't result in much of a measurable gain in the 1/4 mile. 47whp gained below 4,500rpms won't do much good at all as the only time you're accelerating in that area in the 1/4 mile is 1st gear. In a 6MT, you'll be launching at 3,500rpms+ and will sail through the "gain" in a fraction of a second.
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09-19-2018, 09:23 PM | #39 | |
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09-19-2018, 09:47 PM | #40 |
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You learn something new every day, and I have a lot to learn. So the manufacturer will average torque output? On the new Z4 they are publishing 369.
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09-19-2018, 09:51 PM | #41 | |
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09-19-2018, 10:25 PM | #42 | |
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Caterham R500, 263bhp (224whp with 15% loss) / 177lbft, 505kg dry, ~600kg (1320lb) with driver and fuel ~11.6s@119mph quarter mile Caterham 620R, 311bhp (264whp) / 219lbft, 545kg dry, ~640kg (1410lb) with driver and fuel ~11.1s@130mph quarter mile My lesser Caterham R400 with 210bhp / 155lbft will hit 60mph in 3.8 seconds with the manual transmission, a fraction faster with the optional sequential. Can’t beat light weight for great acceleration! |
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