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View Full Version : 350 Crank HP with built S52


Bimmer525e34
04-28-2016, 06:01 AM
hello, i'm building high compression s52(11.5:1), i have euro m3 headers modifed to fit s52, also i have euro ITB. i'm going to buy high lift/duration cams (264/256)
i have ported head with dual valve springs and also block is bored to 87mm.
also i have other minor upgrades like lightweight flywheel and etc.

with good tune, can i reach 350hp with this setup?
Mklock
04-28-2016, 06:41 AM
Get bigger cams (vac cams) and maybe with a lot of luck you will hit 330 crank.
pbonsalb
04-28-2016, 07:59 AM
The 256/264 Schricks are mild. I dont think you would make your goal with them. Your goal is about the best anyone has ever done on an S52.

The 87mm overbore is minimal. The extra point of CR is good for about 2% more power. You need big cams, but go too big and they are solid lifter only.

Can you tune for and use only E85?
digger
04-30-2016, 07:17 PM
power is in the head and induction so ported head and big cams, not wussy 264/256 ones, and id use one of the 45mm ITB kits as the euro ITB are good for 450bhp so are not in the sweetspot for a 350bhp engine the euro get by with a much better vanos system
darbyfam
04-30-2016, 08:25 PM
I have a stock S52 bottom end, S50 intake manifold, Sunbelt Stage 2 cams, Dinan BBTB, 24lb injectors, Supersprint Euro Headers all tuned with a Miller WAR chip. My last dyno was 279WHP or ~335 crank HP.
cky751
05-01-2016, 04:08 AM
I have a stock S52 bottom end, S50 intake manifold, Sunbelt Stage 2 cams, Dinan BBTB, 24lb injectors, Supersprint Euro Headers all tuned with a Miller WAR chip. My last dyno was 279WHP or ~335 crank HP.

impressive! did you tune it yourself?

OP, The odds are stacked against you on this one. These engines hardly hit that supercharged. 350hp is really unheard of for this platform, but I admire you for going after it. Seems like the war chip is the way to go. I know some guys hit high 270's whp with tec 3R's and mega squirts back in day.
darbyfam
05-01-2016, 06:06 PM
impressive! did you tune it yourself?

OP, The odds are stacked against you on this one. These engines hardly hit that supercharged. 350hp is really unheard of for this platform, but I admire you for going after it. Seems like the war chip is the way to go. I know some guys hit high 270's whp with tec 3R's and mega squirts back in day.

Brody at Miller did the remote tuning on WAR.
jakermac
05-02-2016, 05:18 PM
OP, The odds are stacked against you on this one. These engines hardly hit that supercharged. 350hp is really unheard of for this platform, but I admire you for going after it. Seems like the war chip is the way to go. I know some guys hit high 270's whp with tec 3R's and mega squirts back in day.

The OP is talking crank not wheel horsepower.