2.0 sdrive to 2.8i performance. ?

[brittas]

Looking at trading my tts in for a 2.0 z4.sdrive. I would want similar performance to the 2.8i . I gather the engine lump and turbos are the same and its just remap work to get to 250 hp +?

[Maniac]

The engine is slightly different but mostly the same. You can improve performance a lot with a remap. Just go somewhere reputable, after doing plenty of research. I slipped up here recently.

Bear in mind any impact on your warranty and the need to declare this to your insurance as it may be void otherwise .

[brittas]

I would probably use p-torque I phoned them its £500 ish to get to 250 hp . They said its easy to get to 280 ish . Insurance would be a problem with that sort of gain.

[R.E92]

Used P-Torque before, friendly chap who knows what he's doing.

[stuartinzg]

What I don't get with the Insurers is that if you buy a 20i it might cost £350 a year on Insurance
If you buy a 28i, it might cost £370 or maybe even £400 (doubtful)

You remap a 20i to 28i power, £600-£700+

Makes perfect sense.

This is a generalisation of course, some aren't even loading. I work in the Insurance software sector and it frustrates me no end how simplistic many Insurer's rating tables are, and why they don't "cap" to the same value as the model above. It's a generic +X% based on Y, with no thought/consideration.

The key is to find a modified motor specialist who is looking for that niche, but you won't find that with any big name brand.

[brittas]

Can anyone confirm that the 2012 20i is in fact a detuned 28i with all the same engine parts brakes etc??

[techathy]

Take a look at the part numbers on http://www.realoem.com/ & http://www.etk.cc/ see if you can find any differences (not tried my self)

[Maniac]

This has been asked before and though I'm not 100% I do recall reading the injectors being different and perhaps one or two minor bits. I can't be certain though as there's a lot of contradictory information out there with people making guesses into fact.

Whether it's the same or not, you can still remap it to get more power.

[SO8]

I would be vary of just thinking the 20i can be mapped to the same power as a 28i.

I had a 330d LCI which everyone on the forums said was simply a remap onto a 325d LCI. Real OEM seems to support that but DMS when I remapped my 330d said there are differences and I would get more power. I did. A bloke before me had his 325d LCI mapped - it made I think 275 or 280bhp. With, according to the forums the same but mapped engine in my 330d I got 305bhp. DMS said the differences are small but make a difference.

DMS also say the same with the 35i to 35iS. Real OEM shows nothing much different but DMS are, again, adamant there are small differences and the 35i goes to 375-380bhp as opposed to the 400-405bhp for the 35iS.

I can only go on their knowledge but they were correct with the 325d vs 330d !

[Twin Turbo]

Going from memory,

The N20 in F cars has an different bottom end and pistons - so there is an difference - however in the Z4 the bottom end and pistons are the same.

The difference is more with breaking as the 28i has the same breaks as an 35i

The question is if the car is under warranty if not fill your boots - but if it is then any warranty work will be void.

I get 285 bhp out of my 28i with an JB4

I think next time I would go for racechips - as there is an 2 year engine warranty http://www.racechip.com/chiptuning/bmw/ ... /index.php

Insurance £400 with mods and business millage

[MACK]

I would probably use p-torque I phoned them its £500 ish to get to 250 hp . They said its easy to get to 280 ish . Insurance would be a problem with that sort of gain.

I've used P Torque a few times, especially on modded cars (stage 2-3 mods etc) always got good results, never had any problems. Used them on a variety of brands including BMW & VW/Audi. I Like the fact they have their own rolling road so can tailor the mapping to the mods you may have

[MACK]

What I don't get with the Insurers is that if you buy a 20i it might cost £350 a year on Insurance
If you buy a 28i, it might cost £370 or maybe even £400 (doubtful)

You remap a 20i to 28i power, £600-£700+

Makes perfect sense.

This is a generalisation of course, some aren't even loading. I work in the Insurance software sector and it frustrates me no end how simplistic many Insurer's rating tables are, and why they don't "cap" to the same value as the model above. It's a generic +X% based on Y, with no thought/consideration.

The key is to find a modified motor specialist who is looking for that niche, but you won't find that with any big name brand.

Interesting, in my experience with mainstream insurers I've used over the years such as Admiral and the like the price hike has only ever been around the 10% of the standard premium mark for remap.
I think your right they do work it out in very simplistic terms rather than model specific.
However if they did do it in a model specific way, in this case it would probably be fair to pay more on 20i with a remap to 28i power than you would for a standard 28i. The rationale being the out of the box 28i comes with better braking as mentioned earlier.

[brittas]

I managed to get a 28i now so I won't need to map.....Or will I !!!!. Picking it up wednesday. It will be by 3rd z4.

[techathy]

This has been asked before and though I'm not 100% I do recall reading the injectors being different and perhaps one or two minor bits. I can't be certain though as there's a lot of contradictory information out there with people making guesses into fact.

Whether it's the same or not, you can still remap it to get more power.

Not on the 20i v's28i but on other BMWs I've looked into these differences have been caused by BMW changing the parts used for all cars at that time. eg. The high pressure injectors have been changed 3 times in the life of the Z4 - http://www.etk.cc/bmw/EN/search/selectC ... 3/13_1416/

[Twin Turbo]

@brittas welldone on your choice - the 28i is very under rated. You get great MPG - but with an re-map get close to 35i performance - as its considerably lighter and with an re-map or addon box JB4 or Race Chip Ultimate and your getting 285 bhp. I know as I am an ex E92 335i driver. And in real life experience there is little performance difference.