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BMW Z4 Forums (G29) BMW Z4 (G29) General Forum Possible Z4 buyer here, how does Dinan 30i compare to M40i

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      05-22-2020, 06:45 AM   #1
mjposner
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Possible Z4 buyer here, how does Dinan 30i compare to M40i

Building a Z4 gets me this:

Z430i with M Sport, Trim and All Options: $58,000

Z4M40i loaded $68,150

Dinan add-ons for cheaper Z:

DINANTRONICS SPORT PERFORMANCE TUNER 249
DINAN COLD AIR INTAKE 549
DINAN FREE FLOW AXLE-BACK EXHAUST 999

so with these additions totaling $1800 how close in performance?
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      05-22-2020, 07:34 AM   #2
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Although I have't driven a Dinan 30i Z4, but I think buying a M40i Z4 never regret
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      05-22-2020, 07:47 AM   #3
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Only regret would be the extra $$
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      05-22-2020, 09:10 AM   #4
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Did you add Track Package for ~$2500? If you want to make the lighter 4-cyl a performance beast relative to the M40i, I think you really need to add that option in for the differential.

But yeah, you can put it right in the ballpark of the M40i performance and save some money but will still be missing the sound of the 6 cyl.
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      05-22-2020, 10:59 AM   #5
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no experience with Dinan and they have no info for the G29 on their site but I'd be very surprised if they could get anywhere close to the stock M40i's performance with an exhaust, air intake and tuner on the 4cyl....my best guess would be that you might get half way there from the stock 30i

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      05-22-2020, 11:03 AM   #6
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https://en.bsr.se/tuning-kits/t/4118...20-a-b48-b20-b

...well, maybe not half way there.


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      05-22-2020, 11:04 AM   #7
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https://www.dinancars.com/products/s...eries=&mid=X3/

looks like 30% of the difference is more realistic

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      05-22-2020, 11:47 AM   #8
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you may be close to the performance but the whole experience is listening to the sound of the b58 with the top down!
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      05-22-2020, 02:49 PM   #9
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#confused.. on Dinan's site they don't list anything other than pedals as compatible with the g29. If fact they list needing G29's to do development on. Even if same engine, doesn't BMW tune them differently across the line, so the 30% might be on an X3, but would it be for a z4? Or am I not understanding. sorry if dumb question.
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      05-22-2020, 03:22 PM   #10
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Quote:
Originally Posted by TK421BMW View Post
#confused.. on Dinan's site they don't list anything other than pedals as compatible with the g29. If fact they list needing G29's to do development on. Even if same engine, doesn't BMW tune them differently across the line, so the 30% might be on an X3, but would it be for a z4? Or am I not understanding. sorry if dumb question.
I don't think they have a product for the G29 30i yet.....but the same engine in the X3 recieved an additional 40hp and it logical to assume that the Z4 tune would be similar......the point being that it's highly unlikely that any tune is going to close the 127hp (rated) gap between the 4cyl Z4 and the 6....and a cold air intake and exhaust is going to do much less than a tune.

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      05-22-2020, 03:50 PM   #11
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I did include 2500 m package
Dinan is only tuner to match factory warranty and dealer would install
Same engine from 230i and X3 so I had to fudge on that issue

Also, for street Torque not HP is more important. With the 45ft lb you get 340ft lb versus 369ft lb, plus the Z430i is 200 pounds lighter. Stock on a short track the cars weere only 2 seconds apart (1.03 and 1.05)
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      05-22-2020, 05:38 PM   #12
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IMO, the choice here is between a car that likely has a fairly maxed out engine already, due to mods, versus one that is already a lot more powerful and has more headroom for future mods.
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      05-22-2020, 05:49 PM   #13
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HP still matters. Actual dyno of the M40i shows torque at 381....at the rear wheels https://g29.bimmerpost.com/forums/sh....php?t=1657836 Running all the numbers through a drag calculator with a 200lb weight difference shows the stock 30i at 13.7@104.5, a tuned 30i at 13.05@105.8 and the stock M40i at 12.21@117mph.....a quick google search verifies that these numbers are pretty accurate; Car and Driver has the M40i at 12.3@116mph and the 30i at 13.8@102mph. I'm sure there's a tight track somewhere where the weight advantage of a modded 30i would put it on equal or better ground than a stock M40i but if you think it will be as quick on the street or most any performance comparison, I think you'll find you're mistaken. You asked the question, that's my answer based on what info is available.

2 cents,
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      05-22-2020, 07:47 PM   #14
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Quote:
Originally Posted by DPelletier View Post
HP still matters. Actual dyno of the M40i shows torque at 381....at the rear wheels https://g29.bimmerpost.com/forums/sh....php?t=1657836 Running all the numbers through a drag calculator with a 200lb weight difference shows the stock 30i at 13.7@104.5, a tuned 30i at 13.05@105.8 and the stock M40i at 12.21@117mph.....a quick google search verifies that these numbers are pretty accurate; Car and Driver has the M40i at 12.3@116mph and the 30i at 13.8@102mph. I'm sure there's a tight track somewhere where the weight advantage of a modded 30i would put it on equal or better ground than a stock M40i but if you think it will be as quick on the street or most any performance comparison, I think you'll find you're mistaken. You asked the question, that's my answer based on what info is available.

2 cents,
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Yeah, the 1/4 mile speed says it all about the cars available power. Personally not a fan of Dinan. Never liked the fact they were advertising Crank while everybody else in the industry was advertising wheel horsepower. The adds gave them an unattainable in real life advantage over every body else. Joke was its a good warranty with a crappy tune.

Back when I was running just a JB4 & FMIC in my 335is an identical car was running the full boat level III Dinan package. We are both listed on the same Drag Times page back to back listing 204 & 205.

JB4 12.583 @ 114.529 About $700
Dinan 12.590 @ 108.740 About $2500/3000

One of the really dumb pieces of engineering on the 335is was to install the Dinan cool air package you have to remove the secondary water radiator from the car. Most recognize that BMW's are built with a cool air intake so dropping a functional radiator to install a noise maker intake really made no sense to me.

FWIW would buy the most powerful base in the line up to build on. Never regretted one single cent I spent over the years & especially don't regret getting a M40i vs a 30i Z4.
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Last edited by BEAR-AvHistory; 05-22-2020 at 07:58 PM..
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      05-22-2020, 09:24 PM   #15
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Is there a dyno anywhere of the 30i z4?
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      05-22-2020, 11:01 PM   #16
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Quote:
Originally Posted by mjposner View Post
Only regret would be the extra $$
The extra money you pay ensured driving pleasure & performance. So no regret!
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      05-23-2020, 12:50 AM   #17
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Just get the M40i and don't look back.

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      05-23-2020, 05:37 AM   #18
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All good arguments, but what about real world driving. If I do quarter mile races on the street I go to jail. $10,000 is not chump change.

Not direct comparison, but pretty convincing that the extra 10k is worth it:

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      05-23-2020, 10:30 AM   #19
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You will use less throttle out of a normal traffic light start, passing will be quicker, all round driveability will be better as the car is just more responsive.

An inline 6 is naturally smoother running than an inline 4 with the added benefit to some it sounds a whole lot better.

If you have to mod it to be happy the 6 will always get more power with equal modifications.

FWIW Not been buying BMW's that long first was a 2004 330 ZHP convertible. One of the things I noticed is the majority of the debadged cars were the base power versions.
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      05-25-2020, 10:54 AM   #20
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That video pretty much sums it up; 2 seconds in the 1/4 mile is a massive difference that some software and a couple of bolt ons aren't going to erase. ...and while most owners won't ever drag race their Z4's, that kind of acceleration and power difference is very noticeable in every day driving.

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      05-26-2020, 11:13 PM   #21
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That M340i is a fantastic car! I got to drive one and was really impressed.
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