E90 325i Turbo

[individj]

nice. i would of sold and bought a 335i but i can always appreciate someone doing some DIY sh!t for me to learn some lessons :thumbs:

 

[Stephanv]

OP i would like to have a friendly race when you done.

It would be a nice little exercise to see if all your efforts have been worth while

Good luck with the build i dont see why you should listen to the negative comments.

If you want it then go for it.

#boost is life:cthulhu:

 

[sash]

OP i would like to have a friendly race when you done.

It would be a nice little exercise to see if all your efforts have been worth while

Good luck with the build i dont see why you should listen to the negative comments.

If you want it then go for it.

#boost is life:cthulhu:

Scientific testing is always good, but in my mind, the OP is not setting out to build a 335i killer or any other car killer, the main aim was to get more power out of the 325i motor, which most, if not everyone ( in SA at least) avoids.

I am so looking forward to the outcome.

 

[Stephanv]

Updates pleasemgwaiting:

 

[Danny2]

Compression research “machined piston tops seems to be better route to take” researching into this luckily a good friend of mine has all the machinery required to have this done so if needed will be considered.

MAF will be looking at using an aftermarket one based on how stock one performs

Head bolds, once again should be fine under low boost application, milling machine will do the work if it becomes an issue,,, bolts on 335 much larger so it is being considered as an option

yes while machining the piston tops can work you need to check carefully cause if you take too much material off the top of the pistons they will be weaker.

 

[Dhp507]

Good job man...... Push the limits
raise:

 

[AlexYannoulatos]

In for updates :cthulhu:

 

[Captain_Stealth]

awesome thread, keen for updates

 

[CA_130]

Update to all:

Build moving along, learning curve with this build so need to kinda make up things as we go along.

Things done:

Water Lines and bottle moved to passenger side
Oil feed tapped into oil switch
Oil return added to sump (Getting sump off not the easiest)
Busy fabricating Moc manifolds & downpipe

Manifold taking the most amount of time, didnt want to take the head off and dnt have a spare so having to to this piece by pice

received all parts needed - Total spent this far - 9K

Here pics of the progress

:fencelook:

I f***king love it ! Subscribed !! This is what cars are about, not just buying a JB4

 

[SMN325]

As a fellow E90 325i (LCI) owner (who this exercise you are doing is supposed to benefit), this build interests me a lot.

Good luck with your project, and I hope it works out for you

Personally, I will not try anything with my car even if you manage to achieve a significant improvement with yours. This is only because I have also looked into the options and up front decided that the risks outweighed any benefit. Kudos to you for being fearless

 

[sash]

While looking for some parts I came across this.... valuable information if you don’t already know...

https://www.bimmerboost.com/showthread.php?48927-BMW-E60-525i-with-truck-turbo-home-build

 

[gavsadler]

Let me add my 2c:

I agree with all the comments above about the strength of the N52 block etc.

And yes this is going to cost a lot to do properly, there is no cheap way going about boosted builds.

But there have been some success stories overseas. If you search a little bit for BPC (Bimmer Performance Centre) in the States, they’ve successfully boosted a N52, last I checked it was pushing some good numbers too. What you don’t read about is how many motors they went through as part of R&D...

Also, in the UK there is a chap who’s successfully supercharged a 130i, but he’s has endless teething issues as well, mostly around mapping and tuning. I’m not sure if that has been sorted yet.

Anything is possible if you want to do it.

On a personal note, people also thought I was mad to do my Ute conversion, and I also heard the stories about “you can buy an Astra OPC for less”. But I was determined to do it. What I can also say is that I spent more initially to do it right 1st time, and it has been reliable and fantastic since then: 6years and about 75000kms later.

I’ll be keen to see progress on this. Good luck

 

[Ddoooooon]

hmmm any updates mgwaiting:

 

[Captain_Stealth]

Came across this thread maybe can help you out a bit

https://www.e90post.com/forums/showthread.php?t=1378565

 

[momo1]

Maybe a bit off topic.. But OP has a 325i N52 which in stock form is 160kw, The same N52 in a 330i has 190kw,im not sure exactly the differences but as per my logic would not a simple remap and exhaust give him the extra 30kw pre forced induction?

 

[zakes27]

Maybe a bit off topic.. But OP has a 325i N52 which in stock form is 160kw, The same N52 in a 330i has 190kw,im not sure exactly the differences but as per my logic would not a simple remap and exhaust give him the extra 30kw pre forced induction?

nope, 325i is a 2.5 with stage 2 intake, 330 is a 3.0 with stage 3 intake. i think besides block, internals and intake manifold, all other parts are the same. you can put the stage 3 intake on the 325i with software though

 

[yush1]

You get minimal gains with SW on a N/A car. Maybe 10kw at best, especially at the reef. A waste of time IMO.

 

[cOlDFuSiOn]

Maybe a bit off topic.. But OP has a 325i N52 which in stock form is 160kw, The same N52 in a 330i has 190kw,im not sure exactly the differences but as per my logic would not a simple remap and exhaust give him the extra 30kw pre forced induction?

nope, 325i is a 2.5 with stage 2 intake, 330 is a 3.0 with stage 3 intake. i think besides block, internals and intake manifold, all other parts are the same. you can put the stage 3 intake on the 325i with software though

What is a stage 2/3 intake on a stock BMW? Never heard of that before.

 

[husaindindar]

Maybe a bit off topic.. But OP has a 325i N52 which in stock form is 160kw, The same N52 in a 330i has 190kw,im not sure exactly the differences but as per my logic would not a simple remap and exhaust give him the extra 30kw pre forced induction?

nope, 325i is a 2.5 with stage 2 intake, 330 is a 3.0 with stage 3 intake. i think besides block, internals and intake manifold, all other parts are the same. you can put the stage 3 intake on the 325i with software though

What is a stage 2/3 intake on a stock BMW? Never heard of that before.

He speaks about the number of DISA valves on the intake runners.
These DISA flaps open and close at different RPM's changing the intake runner length and area.

From my knowledge, the 325 and 330 both have 2 stage intakes (2 DISA's).
The 323i has a single stage (1 DISA).

 

[Captain_Stealth]

Been thinking you should probably look into changing the diff to a e90 330i manual one as it should be a direct swap and it should change the ratio to 3.15 which would be better for boost as your gears would end up being slightly longer. which will hold boost for longer and top speed will slightly be lifted

Cheers