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      09-18-2018, 05:49 PM   #23
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Quote:
Originally Posted by Rosseau View Post
Using your formula, is there a way to determine approx 1/4 improvement using Dinan's MAX HP Gain of 47 WHP at 6,500 (Stage 1 tune is $1,400 for an M240i).

From a simplistic perspective, like the audiophile, we are facing the law of diminishing returns on performance vs. cost. It takes a lot more HP to get a car from 4.2 sec-to-60 down to 3.7, versus getting a 5.8 sec car down to 5.3.
I would say if the car can do 12.7@106mph stock and 47WHP is added, then it will probably be able to do 12.0@112mph with the tune.
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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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Quote:
Originally Posted by aerobod View Post
I would say if the car can do 12.7@106mph stock and 47WHP is added, then it will probably be able to do 12.0@112mph with the tune.
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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Quote:
Originally Posted by B58togo View Post
47 whp won't add 6 mph to the trap. I wish it would, but it won't.
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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Quote:
Originally Posted by MarkDemma View Post
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
How do they add 47HP and no torque? Maybe it's underrated?
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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Quote:
Originally Posted by Rosseau View Post

And that VANOS system had better never ever need changin'
It was a vanos repair, or rather the need for, that finally had me give up my E46 ZHP
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      09-19-2018, 01:09 AM   #30
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Sorry to hear that. As you probably know, on the 2018-2019 M240i it will require the engine to be removed.
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      09-19-2018, 01:13 AM   #31
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Originally Posted by Rosseau View Post
Sorry to hear that. As you probably know, on the 2018-2019 M240i it will require the engine to be removed.
Oh I'm sure they have all the kinks worked out and I'll never ever have to do that. #blissfullignorance
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      09-19-2018, 01:43 AM   #32
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I agree wholeheartedly
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      09-19-2018, 02:13 AM   #33
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Has anyone here dynoied the 230i?
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      09-19-2018, 03:29 AM   #34
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2018 non-xdrive:

Factory Rated HP 248 (256 Measured)
Factory Rated Torque 258 (263 Measured)
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      09-19-2018, 09:25 AM   #35
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Quote:
Originally Posted by Rosseau View Post
How do they add 47HP and no torque? Maybe it's underrated?
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.

Quote:
Originally Posted by Rosseau View Post
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?
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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Quote:
Originally Posted by bryan_f22 View Post
there is no way possible 47whp lowers .7 seconds.

30whp = .2 and 2-3 mph in trap.
As I mentioned above, incorrect input parameters due to SI to imperial conversion error.
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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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Quote:
Originally Posted by XutvJet View Post
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.
Also heavily dependant on how fast and powerful the car is to begin with. All else being equal, a mid 14 second car will see more of a reduction in ET from those 47 whp than a mid 11 second car. You won’t go from 11.50’s to 11.00’s on 47 whp, even if you get it right off idle to redline.
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      09-19-2018, 09:47 PM   #40
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Quote:
Originally Posted by TajoMan View Post
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.
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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Quote:
Originally Posted by B58togo View Post
Also heavily dependant on how fast and powerful the car is to begin with. All else being equal, a mid 14 second car will see more of a reduction in ET from those 47 whp than a mid 11 second car. You won’t go from 11.50’s to 11.00’s on 47 whp, even if you get it right off idle to redline.
Yes, the previously mentioned law of diminishing returns. I need to check the forums to find a person who has modded their vehicle (preferably an M240i) and then tracked/timed it.
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      09-19-2018, 10:25 PM   #42
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Quote:
Originally Posted by B58togo View Post
You won’t go from 11.50’s to 11.00’s on 47 whp, even if you get it right off idle to redline.
Not many road legal cars can, but there are a couple of Atoms and Caterhams that will, a comparison of 2 Caterhams of similar weight with 40whp power difference:

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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      09-20-2018, 09:27 AM   #43
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Originally Posted by aerobod View Post
Can’t beat light weight for great acceleration!
Unsprung even more so
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      09-23-2018, 11:39 PM   #44
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I wanted to remove the right seat but got some flak from the wife.
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