Review of Digi-tec 125i tune

[1q2w3e4r]

Originally Posted by MrBlonde

There are all sorts of cars at a street meet, from seriously modded cars to factory stock cars. There are more modded cars than stockers but really it makes no difference to you and your run.

If you can organise a group of BMW car owners to go out one night together then it can become a lot more fun.

I hold an ANDRA race licence since 2003 and have been to WSID many many times. I'm happy to come out and how any newbies the ropes. I understand it can be a bit confronting the first time but believe me when I tell you it is very simple and a lot of fun.

Sounds good, lets do it.

[MrBlonde]

I can tell you how a stock 130i goes with factory runflats. I ran mine at WSID.

[MrBlonde]

Originally Posted by 1q2w3e4r

Sounds good, lets do it.

Yep after this is sorted

[tyorll]

Originally Posted by MrBlonde

Yep after this is sorted

pfft, you baby . Involves base of 5th metatarsal on your left foot! Most of these guys are driving DCTs anyway. Only need one foot. You can drive their autos and let someone else drive your beast for the evening. Be keen to see what times/speeds your machine is capable of with everything you've done to her.

[MrBlonde]

Yeah a Jones Fracture but so far have avoided internal fixation, followup X ray soon will tell!







Want to avoid this!

[tyorll]

I'd opt for the non-operative approach as well. Feet don't heal very well - poor blood supply simply due to distance from the heart. Avoid wounds - surgical or otherwise - where possible.

NB: Don't even know what you do for a living. Probably "preaching to the converted". Ignore my ramblings.

[alik01]

Doesn't look too good mate. How'd you manage that? They didn't kill Kenny, but they sure maimed Kenny!

[Stuart@BMRAutowerkes]

Rolling diameter of 17s and 18s is the same due to higher and lower profiles. There may be a slight overall difference of a few percent, but it's negligible really.

Manufacturers fit 18s to cars because it looks better.

For acceleration times you want as much rubber as possible both width and sidewall, which means a higher profile, therefore drop to 17inch or smaller wheel.
Under acceleration, the tyre 'deforms' to become flatter to provide more grip...

For circuit racing, it's a different story, with cars running larger wheels (in this case 350z fitted with 18s vs 19s) and the 19s proving to be slightly faster around the track.

[MrBlonde]

Originally Posted by tyorll

I'd opt for the non-operative approach as well. Feet don't heal very well - poor blood supply simply due to distance from the heart. Avoid wounds - surgical or otherwise - where possible.

NB: Don't even know what you do for a living. Probably "preaching to the converted". Ignore my ramblings.

No mate it's all good advice. I'm in IT consulting so everything I know about the human body and orthopedics is from questions I've asked after being brutalise in the past!

I agree the feet have shit blood supply which leads to lengthy healing times and increased non-union. That's what I am worried about because I am a runner and I already have a best case 12 weeks off running. I want to avoid ORIF if at all possible because I don't want chronic pain at the screw site or to have to worry about possible removal of screws later down the track.

[MrBlonde]

Originally Posted by alik01

Doesn't look too good mate. How'd you manage that? They didn't kill Kenny, but they sure maimed Kenny!

Basketball collision, I kept playing for 17 minutes afterwards thinking it was just an ankle sprain. Now have to sit down to shower :-(

[MrBlonde]

Originally Posted by bmroxm5

Rolling diameter of 17s and 18s is the same due to higher and lower profiles. There may be a slight overall difference of a few percent, but it's negligible really.

Manufacturers fit 18s to cars because it looks better.

For acceleration times you want as much rubber as possible both width and sidewall, which means a higher profile, therefore drop to 17inch or smaller wheel.
Under acceleration, the tyre 'deforms' to become flatter to provide more grip...

For circuit racing, it's a different story, with cars running larger wheels (in this case 350z fitted with 18s vs 19s) and the 19s proving to be slightly faster around the track.

Well the rolling diameter totally depends on the wheel and tyre sizes but yeah you can match them pretty closely if you try.

For more info on selection of rubber for drag racing click on the link in my sig. The no brainer wheel/tyre combo for drag racing our rigs is Kosei K1 with 255/50 R16 MT ET Streets.

Circuit racing I'd recommend considering 18" wheels because of rubber selections.

[tyorll]

What about brake calipers? I've been informed for my Cayenne that the reason you can't have lower than 19" rims (for potential offroad - 17"s would be best) because they won't fit the massive brake calipers. Truth?

[MrBlonde]

Originally Posted by tyorll

What about brake calipers? I've been informed for my Cayenne that the reason you can't have lower than 19" rims (for potential offroad - 17"s would be best) because they won't fit the massive brake calipers. Truth?

Often yes it is true. If you want to go drag racing you sometimes have to fit smaller calipers to clear the smaller diameter wheels.

[AussieAlf]

Originally Posted by Drawn05

If 17" wheels are preferable over 18", why does the 135, S3, S4, TTS, TTRS, Golf R and Evo all come standard with 18"? Why would these manufacturers want to a). offer a wheel that would cost more and b). offer lower performance)? Hell, even the mazda 3 mps comes with 18s

Show vs. Go. I had 2 sets of wheels for the MX-5 Turbo. 17's for show, 16's for go. But the go difference I noted was not in dragstrip style acceleration (secure enough in the size of my manhood that this isn't too imprtant to me - I had an MX-5 after all). The difference is in road holding and handling through the twisties.

It's all about unsprung weight, though, and bigger, lighter wheels will be better than smaller heavier wheels. Then again, thicker tyres add some spring and improve performance, too.

This article from tirerack is a good read: http://www.tirerack.com/wheels/tech/...jsp?techid=108

Cheers,
Alf

[Stuart@BMRAutowerkes]

Any updates with runs against a stock 125?

I'm going to contact them see what they can do for my N52B25...

Also I'm assuming your contact with them was in German, using Google translator lol?

edit: digitec claims 40kw and 30nm increase for my car... which is pretty hefty for a 2.5L engine!

[Taymaishu]

Originally Posted by bmroxm5

Any updates with runs against a stock 125?

I'm going to contact them see what they can do for my N52B25...

Also I'm assuming your contact with them was in German, using Google translator lol?

edit: digitec claims 40kw and 30nm increase for my car... which is pretty hefty for a 2.5L engine!

We could do a joint ECU ship

[Stuart@BMRAutowerkes]

Originally Posted by Taymaishu

We could do a joint ECU ship

too many eggs in one basket!

[Taymaishu]

Originally Posted by bmroxm5

too many eggs in one basket!

But it's tax time soon!

[MrBlonde]

Originally Posted by AussieAlf

..
(secure enough in the size of my manhood that this isn't too imprtant to me
..

Alf, photos or it didn't happen!

[Drawn05]

Originally Posted by bmroxm5

Any updates with runs against a stock 125?

I'm going to contact them see what they can do for my N52B25...

Also I'm assuming your contact with them was in German, using Google translator lol?

edit: digitec claims 40kw and 30nm increase for my car... which is pretty hefty for a 2.5L engine!

Sorry, I have been meaning to post some more about the flash but have had a intense week last week. Would still be interested in another tune:stock comparo, but have had other priorities. Besides, I got the last of the 313s in the mail yesterday so I have to get some new non-rfts fitted ASAP.

The tune is great but at the end of the day the 125 even with 200kw is still not going to get near a stock 135i. If the 125i is your daily driver in the "Race to Work 500", then get the perf, exhaust and a german tune as it will feel like a different car (it will certainly sound like one). These are the best 10 times I have recorded with the g-tech (which has been the only real way of testing the power increase so far):

5.73, 5.85, 5.94, 5.97, 6.01, 6.04, 6.12, 6.18, 6.21, 6.23. The gtech also records 200m and g force.

The sub 6 second times are very hard to achieve, I have timed around 30 0-100 runs (mostly at night) and have only broken under 6 seconds 4 times (and 5.9 4 might as well be 6 anyway). When the conditions are crap (i.e. too hot) I seem to get around 6.6-6.8 seconds. Of course, these times are only as accurate as the gtech.

I think with this tune (or any decent n52 tune) you have to take it easy as the transmission starts to act up a bit, as the 130 has a different torque converter for the increased power. After about a dozen hard runs it started to shudder, so I try to not push much for very long anymore.

Tino was great and speaks perfect english so there is no break-down in communication. That said, I am unsure that their 325i tune is for the 2.5l version, as they have the 3.0l N53 in germany.

[MrBlonde]

What were your time with the G Tech before the tweak?

[Stuart@BMRAutowerkes]

Originally Posted by MrBlonde

What were your time with the G Tech before the tweak?

He got the G Tech after the tune.. only comparo is against Chylld's stock 125i.