Engine Swap...

[andrey_gta]

^^ lol
@mikal7 he's not high and mighty. He takes his non sport 128i for some track time quite often.

[Bimmer-Bob]

Originally Posted by andrey_gta

^^ lol
@mikal7 he's not high and mighty. He takes his non sport 128i for some track time quite often.

And?

[Obioban]

Originally Posted by Bimmer-Bob

I guess cheap and easy are relative terms, but I've certainly never heard anyone else throw those words around when it comes to tuning an N52 for more power. I mean, we're talking about a community that considers one of its most popular "power mods" a charcoal filter delete + drop-in K&N filter.

Don't get me wrong, I love my 128i and it's N52, but it's certainly not cheap and easy to extract more power from. There are relatively few things one can do to the engine, none of them are cheap, and gains are modest. To me "cheap and easy" is something like putting a JB4 on an N54 (roughly $500 for +100 HP). Nothing like that for an N52.

You can go from 230 to ~300 hp for <$2000 without decreasing reliability or the linear nature of the powerband (neither of which is true of a jb4 tune). I'd consider that absurdly cheap and easy, especially on the scale of NA engines!

[ilikebmxbikes]

Originally Posted by Obioban

You can go from 230 to ~300 hp for <$2000 without decreasing reliability or the linear nature of the powerband (neither of which is true of a jb4 tune). I'd consider that absurdly cheap and easy, especially on the scale of NA engines!

How do you boost a N52 to 300HP for $2k? and how do you do it with Zero decrease in reliability? $2k for 75hp is pretty cheap.

[631twentyeighteye]

intake manifold-300-400
SS headers-1200(best price ive found)
evolve tune-900

est to be 300ish crank hp.

zero decrease in reliability because its an OEM intake manifold, the headers are only change exhaust flow, and the tune is simply optimizing all parameters on the engine within a safety limit.

[Bimmer-Bob]

Originally Posted by 631twentyeighteye

intake manifold-300-400
SS headers-1200(best price ive found)
evolve tune-900

est to be 300ish crank hp.

zero decrease in reliability because its an OEM intake manifold, the headers are only change exhaust flow, and the tune is simply optimizing all parameters on the engine within a safety limit.

Where are you finding SuperSprint headers for $1200? That's really good. Turner lists them for almost $1800 (and that is supposedly a "sale price"). Add in a $900 Evolve tune, and you're at $2700. $300 is probably realistic for a used manifold (closer to $1000 for new parts). Add in another $50 for new gaskets and hardware, and you're a little above $3000 (hardly sub-$2000), no matter how you cut it. And that's not even considering labor costs, if you need to factor that in.

The estimated 300 HP part is only per a few members here without any real objective data to back it up. Evolve's own dyno shows a 125i (already equipped with the 3-stage manifold) making 256 HP at the flywheel. I doubt SS's headers make +44 HP. In fact, Turner says to expect 15-20 HP, and they got up to 272 HP on a 325i race car with them (I think they were using the 3-stage manifold as well).

This is becoming like a game of telephone.

[ilikebmxbikes]

Plus install labor, tax and shipping - probably sitting more around $4k.

And tuning up an engine up 75HP will decrease reliability. Significantly or not, you will experience more wear than the stock map.

Im curious how a 128i with the mentioned mods would do vs a stock 135i.

[ilikebmxbikes]

Originally Posted by Bimmer-Bob

Where are you finding SuperSprint headers for $1200? That's really good. Turner lists them for almost $1800 (and that is supposedly a "sale price"). Add in a $900 Evolve tune, and you're at $2700. $300 is probably realistic for a used manifold (closer to $1000 for new parts). Add in another $50 for new gaskets and hardware, and you're a little above $3000 (hardly sub-$2000), no matter how you cut it. And that's not even considering labor costs, if you need to factor that in.

The estimated 300 HP part is only per a few members here without any real objective data to back it up. Evolve's own dyno shows a 125i (already equipped with the 3-stage manifold) making 256 HP at the flywheel. I doubt SS's headers make +44 HP. In fact, Turner says to expect 15-20 HP, and they got up to 272 HP on a 325i race car with them (I think they were using the 3-stage manifold as well).



This is becoming like a game of telephone.

I think you are using WHP and the claimed 300 is at the crank.

[631twentyeighteye]

stock 130i=260bhp. tuned 130i=275ish bhp(both before SS headers). Evolve has said themselves that 125i's can't get to 130i hp numbers, but almost can. I'm unsure of this, maybe exhaust differences or just tuning things that cannot be altered on 125i's, but that's what i read on their website.

[Bimmer-Bob]

Originally Posted by ilikebmxbikes

I think you are using WHP and the claimed 300 is at the crank.

For what? The 256 HP 125i? The dyno sheet says flywheel. I guess they used an engine dyno, or it's a derived value. Either way, the whp number is 209.

http://www.1addicts.com/forums/showthread.php?t=778456

[Bimmer-Bob]

Originally Posted by 631twentyeighteye

stock 130i=260bhp. tuned 130i=275ish bhp. Evolve has said themselves that 125i's can't get to 130i hp numbers, but almost can. I'm unsure of this, maybe exhaust differences or just tuning things that cannot be altered on 125i's, but that's what i read on their website.

Okay. So where does that put an Evolve-tuned 128i? No one knows, and that's exactly my point. It may have exactly the same limitations that the 125i has.

[Dafttt]

Doesn't matter which side of the argument you're on, it's simply futile to argue this further without actual dyno results.

Personally, I don't think my car will hit 300hp or bhp with headers, manifold, and a tune, but that's certainly not stopping me from going forward.

[631twentyeighteye]

My baseline is thursday, ill have the tune and manifold the end of this week into next week, i'll install them and run them on the car for a week or two, and get another dyno. Then eventually when i get headers i'll get another dyno done. I can also take the tune off to just get a manifold dyno, but i suspect many don't care much for that as much.

[ilikebmxbikes]

Originally Posted by 631twentyeighteye

My baseline is thursday, ill have the tune and manifold the end of this week into next week, i'll install them and run them on the car for a week or two, and get another dyno. Then eventually when i get headers i'll get another dyno done. I can also take the tune off to just get a manifold dyno, but i suspect many don't care much for that as much.

You would be contributing new information to the forum. It would very valuable to a lot of people and eliminate a ton of the speculation on here. Whatever your results are you would be doing a service.

[631twentyeighteye]

A local 135 guy is hooking me up with the shop he manage's dyno, many thanks to him. I won't be getting the headers as soon as expected, but eventually i'll be able to get them on and get another dyno. I"m curious myself what the numbers will look like. I do have an injen intake and a slightly modded exhaust, but at least it'll be something.

[nacaruh]

I feel guilty for putting up this thread...
I was literally on the edge for this huge project, but I found a great deal on a 08' 135i that I'm picking up this Friday!