[eleven11]

Unless you go beyond standard FBO/tune/ethanol with your engine, you're not going to get close to 500hp. If you do, you're going to venture into significant cost and decreased reliability. As suggested, switching to a vehicle with a B58 will allow much more room for gains. Otherwise, I'd also consider a transmission tune (xHP).

[430QB]

Originally Posted by sqwinny

You can make high 300s on an IM450 or low to mid 400s on an IPOSMotorsport im450. high 400s on a IPOSMotorsport im500 with an ethanol mix + meth injection. The owner of IPOS Motorsport is local to me. Their car is FAST on stock motor.

There’s a lot of info out there, but this forum is a small echo chamber of negativity when it comes to the 4 cylinder n20/n26/b46/b48 cars.

Sadly, all the good information and high powered n20/n26/b46/b48 people and info has moved to Facebook under “the n20, m26 & b48, b46 car club” group on Facebook.

Yes the stock 330i/430i low compression motor handles 37 psi no issues. For safety and heat due to factory pistons, 32psi should be the limit.

Attached is a dyno for the IM450 on crappy euro 95 ron.

https://iposmotorsport.com

Typical mods are:
downpipe
Full exhaust
B58tu pump or LT1 pump upgrade
Turbo inlet
Intake
Chargepipe (stock holds 37lbs no issues)
xHP trans tune

Custom tune of course

I’m about to tap in with you great information To know! This literally answered all my questions regarding the dyno and how much it can produce .

[sqwinny]

Originally Posted by 430QB

I’m about to tap in with you great information To know! This literally answered all my questions regarding the dyno and how much it can produce .

More or less everything the b58 can do the b48 can do. Limiting factor is fueling aka fuel injectors like the b58. All HPFP upgrades from the b58 fit and cross over onto the b46/b48 with a check box within MG Flasher. Bm3 works as well, but a request has to be made.

Stock turbo is limited to around 320 whp on a full e85 tune if you swap over a b58tu pump. Plug and play for the b58tu pump.

IPos turbos appear to be the way to go as they are recasted factory manifolds with bigger ar housings to allow for more boost, but also twin scroll to keep stock like turbo response. This allows you to use all your mods that fit the stock turbo, a coupler adapter is made for the larger turbo inlet.

Pure turbo for this car makes the same power as the n20 as the b46/b48 gen 1 use a similar sized td04 turbo. Thus 330whp or 360whp on ethanol is the max there. For 2500 without a core im450 is a bargain to make more power + have head room + don’t need to pay a core fee.

[430QB]

Originally Posted by sqwinny

More or less everything the b58 can do the b48 can do. Limiting factor is fueling aka fuel injectors like the b58. All HPFP upgrades from the b58 fit and cross over onto the b46/b48 with a check box within MG Flasher. Bm3 works as well, but a request has to be made.

Stock turbo is limited to around 320 whp on a full e85 tune if you swap over a b58tu pump. Plug and play for the b58tu pump.

IPos turbos appear to be the way to go as they are recasted factory manifolds with bigger ar housings to allow for more boost, but also twin scroll to keep stock like turbo response. This allows you to use all your mods that fit the stock turbo, a coupler adapter is made for the larger turbo inlet.

Pure turbo for this car makes the same power as the n20 as the b46/b48 gen 1 use a similar sized td04 turbo. Thus 330whp or 360whp on ethanol is the max there. For 2500 without a core im450 is a bargain to make more power + have head room + don’t need to pay a core fee.

As long as I can max it to 350whp that’s good to know now I can produce that much how do I make the request for bm3 ? To crossover upgrades for all hpfp upgrades ?

[430QB]

I’m going to hit you personally while I go through the next stage of this tune and dyno runs .

[sqwinny]

You can’t make 350whp from the stock turbo. Need to upgrade the turbo as the stock turbo cannot flow enough air for 350whp.

You’ll have to get a custom tune, I recommend navardi tuned. “Internet search navardi tuned” and their website will pop up as this forum doesn’t like outside links.

Bimmerpost wants 185 a MONTH to advertise so yeah, no.

This is a huge info dump for anyone searching

https://bmwenginewiki.com/en/home

[430QB]

Originally Posted by sqwinny

You can’t make 350whp from the stock turbo. Need to upgrade the turbo as the stock turbo cannot flow enough air for 350whp.

You’ll have to get a custom tune, I recommend navardi tuned. “Internet search navardi tuned” and their website will pop up as this forum doesn’t like outside links.

Bimmerpost wants 185 a MONTH to advertise so yeah, no.

This is a huge info dump for anyone searching

https://bmwenginewiki.com/en/home

Do I have to make a request on bootmod3 before running it on the dyno ?

[430QB]

And of course not the stock turbo bro lol

[sqwinny]

Originally Posted by 430QB

Do I have to make a request on bootmod3 before running it on the dyno ?

Stock turbo dyno ? No.

But for the custom tune stuff you have to request for a tune. My maps -> request custom

[chowser51]

Anyone try the turbo from a b48e? (Or whatever the turbo is for the m235i/m35i engines)

Anyways, b58 or s58 is where it’s at. Lol

[Wires]

If you want to use some "cowboy math" on this:

B58 - 6 cylinders - 500 WHP
B48 - 4 cylinders - 500/6 * 4 = 333 WHP

Both of those engines come from the same roots, one is missing 2 cylinders from the factory. Can you get 350WHP reliable on a B48, no clue... My gut says no.

[430QB]

Originally Posted by sqwinny

Stock turbo dyno ? No.

But for the custom tune stuff you have to request for a tune. My maps -> request custom

Request after I upgrade turbo will big turbo be good ??not stock the one for the inline 4

[sqwinny]

Originally Posted by chowser51

Anyone try the turbo from a b48e? (Or whatever the turbo is for the m235i/m35i engines)

Anyways, b58 or s58 is where it’s at. Lol

B48e is around 360 on 93 and 380 on e85. It’s around 400 wheel torque on both fuels.

It’s better to go with the iPos unit now that it’s available for f chassis cars. The mini coopers with the b48 the b48e bolts right up with minimal mods (weld mounting “bracket”) and it’s plug and play

[sqwinny]

This is the size difference of the stock gen 1 b48 turbo vs the IPOS IM500. I was asked to not release dyno sheets of that, but it was 480whp + on e50 mix with methanol injection. Full bolt ons + custom tune of course