What "bolt ons" bring an s52 to 300hp and what's the cost?

[JGood]

If you notice those are s50's and you're trying to say that a bigger maf, tune and exhaust had 50 hp? Seriously?

You posted some of the highest s50's I've ever seen. This proves the uselessness of dyno's when it comes to comparing peak numbers to another engine, on another dyno, on the other side of the country.



Spend some time looking through here for an idea of average output (with or without mods):

http://forums.bimmerforums.com/forum/showthread.php?t=454142&highlight=dyno+library

[C-T]

I have never seen a dyno of an s52 under 205.

Ah. "205."

Yes, sadly, I have seen some dyno very weak around 195 whp. Needless to say, the owners weren't particularly ecstatic.

[C-T]

I have never seen a dyno of an s52 under 25.

I assume you mean 225 whp, and I also assume that you mean posted online.

My original S52 out of my 1997 M3 put down 209 whp stock, on the Boston Dyno Dynojet.

With ERT Double-belt crank pulley, Conforti CAI, Dinan Stage II SW, and a B&B Tri-Flo, it put down 225 whp, and 225 TQ on the same dyno.

With the UDP removed, and an AA LTW flywheel added along with the M50 manifold, it put down 234 whp and 215 TQ on the same dyno.

These numbers are right in line with just about every S52 that I saw dyno'd from the Boston BMWCCA from the 1997-2005 years, at which point I moved to CT, sold my original engine, and bought the race engine that now resides in my E30.

I can only speak from my personal experience.

[Uber E30]

Hah... thats the glory of an IT job... i get the browse web pages all day. Whats up with the drain? That o-ring thing someone else was talking about?

[jrdeamicis]

I have never seen a dyno of an s52 under 205.

I swear. I dont think you work. Lol.

Btw. The radiator is working well besides the silly drain thing.

[Uber E30]

I have never seen a dyno of an s52 under 205.

[jrdeamicis]

I have seen around 200-210 on stock S50s and S52s.

[C-T]

If you notice those are s50's and you're trying to say that a bigger maf, tune and exhaust had 50 hp? Seriously?

I am telling you what I have seen, repeatedly, since the S52 debuted. Most put down around 205 whp stock on a Dynojet, a good number put down ~210-215 whp, and some were even higher. That's their number.

Why? Have you seen something different?

[Uber E30]

If you notice those are s50's and you're trying to say that a bigger maf, tune and exhaust had 50 hp? Seriously?

[C-T]

I fail to see the surprise. Modded s52 = more hp then stock s52.

Seriously. I'm a little confused as well.

[JGood]

Dood wtf are you talking about?!?!?

I fail to see the surprise. Modded s52 = more hp then stock s52.

[WADE30]

Dude aren't those 2 dynos for S50 with a lot of mods? And NOT stock s52 whp?

[C-T]

Dood wtf are you talking about?!?!?

I am talking about my experience. I have been watching S52s dyno since 1996, and from what I have seen, the average for a stock S52, following up to JGood's post above me, on the Boston area Dynojets = Around 205 whp.

But those are some really nice modified S5x dynos!

Here's mine:

[Uber E30]

WHP for a stock S52 will be around 195-210 on a Dynojet

Dood wtf are you talking about?!?!?

115k mile s50us
zf trans
3.73 diff
205.50.15 on ronal turbos
UUC alternado pulley
no powersteering
3.5 540i maf
3.5 bimmer world intake boot
3.5 K&N hot air intake
jb racing flywheel
TRM toonage
ebay supersprint headers
dual 2.25 exhaust (no xpipe) into glass pack

Mods:

-Stickley Chip
-24# Inj.
-3.5'' HFM
-silicone 90* bend (replaces accordian)
-Amsoil intake filter
-Coated "Ebay" Supersprint header knock-offs
-2.5'' Single exhaust with Magnaflow cat, resonator, muffler
-10# JB Racing flywheel
-Clutch fan delete

I am original owner of the engine and has only about 40,000 miles.

[C-T]

WHP for a stock S52 will be around 195-210 on a Dynojet, depending on the car, the dyno, and the condition of the engine. I have seen as high as 220 or so for freak engines, but those are the anomalies, with the majority of the stock dynos that I have seen coming in at the ~ 205 whp mark.

clydesdale, if you are looking for 300 NA whp, it isn't going to be realistic without either delivering a dumptruck full of money to an engine builder, or going FI. If you are looking for 300 crank hp, then it can be done with a properly setup cam kit.