Checked V8 forums. Turbocharged V8s running on methanol @ 30 psi & 7000 rpm ignition is 35 BTDC.
my ignition map: 8 BTDC @ 30 psi @ 7000 rpm, running on methanol.
Is my ignition too much retarded or are the V8s less prone to knock?
What's your setup?
WOT
Those V8s are light years behind S54 efficiency,that is the main reason for the large timing advance.Someone more experienced will chime in,but my guess is you may add a few degree of timing,but nothing close to 35.
Last edited by futureroadracer; 01-05-2015 at 02:35 PM.
OLD
E30
636whp
1/4 mile: 10.91@144.38
http://www.youtube.com/watch?v=L_f7fUVqblI
NEW BUILD
335d
520whp
635wtq
120.51mph trap speed
I created a thread years ago about this... http://www.bimmerforums.com/forum/sh...-than-4v-heads
8deg at 7000rpm looks odd to me...
For example M50 2.8 9.5cr on E85 Ethanol wants 21deg at 7000rpm/2bar.
OK S54 is more efficient and you probably are making 300-400whp more there, but still i would expect higher numbers than 8, especially on Methanol. Have you tried more advance, is torque increasing ?
Is your base timing 101% correct ? What power figures are you making ?
E30 325i '90 - M50B25 stock + ARP + HX52 + E85 = 651WHP
E46 330cd '04 M-Technic
E92 335i '10 M-Technic
Dynapack 2WD 1500HP Dyno
Tune your engine on the hub dyno and see what it wants
E30 325i '90 - M50B25 stock + ARP + HX52 + E85 = 651WHP
E46 330cd '04 M-Technic
E92 335i '10 M-Technic
Dynapack 2WD 1500HP Dyno
VE table.jpgIgnition.jpg
Now focusing on my turbo E30:
93 OCTANE
M20: 2.5L w/ oring, arp headstuds, stock OEM headgasket, 8.8:1 compression
42lb bosch injectors
M30 auto TPS
MS2
Stock intake (head is bimmerheads with 274 cam)
Stock ignition system
Stock exhaust manifold -> ebay adapter
ebay GT35 turbo (.63/.70)
3" exhaust through muffler
44mm TIAL wastegate
ebay 50mm blowoff valve
Yesterday, made 233 rwhp/244 rwtq at 15 psi(manual boost controller) on a mustang dyno; turbo is pretty laggy but not too bad considering I am looking for around 300/300 right now. What I am trying to figure out right now are 3 things:
1) Is my setup (adapter and turbo) as efficient as it is going to get or am I leaving power on the table, i.e. are my tables too conservative?
2) Right now, from 6000 to 6500 rpms, the car is pulling timing from 16.3 all the way down to 4 in just 500 rpms! So have to look at why
3) Currently, running without a TPS. Ran stock ICV for 3 months with no issues....started car one day, and idle jumped to 3k rpms! No input in MS2 for idle would affect idle, swapped in 2 x brand new ICVs, no change, unplugging ICV = no change. This was with zero changes to MS2??? I would like to run an ICV because I still have A/C
Last edited by BMWManiac; 01-09-2015 at 08:05 AM.
1997 Arctic Silver/Black M3
CES Stage IV (651rwhp/615rwtq @ 24 psi)
1999 Techno Violet/Dove M3
Auto/Convertible and staying stock!
Sounds like you're on the low side... and your IGN table doesn't look like it's too far retarded.
Are you sure the MS2 is properly sync'd and you're actually getting the advance values you're entering? The peak number will also suffer since you're dropping to 4 deg after 6k obviously.
1997 Arctic Silver/Black M3
CES Stage IV (651rwhp/615rwtq @ 24 psi)
1999 Techno Violet/Dove M3
Auto/Convertible and staying stock!
I wouldn't have the 225 KPA row at 2-degrees. Isn't 15 psi somewhere between 200-225KPA? If so, then MS is just running mostly at the 225 side of things, no?
WOT
I'm seeing a MAP reading of 190s....I just put 2.0 as a safety for overboost
1997 Arctic Silver/Black M3
CES Stage IV (651rwhp/615rwtq @ 24 psi)
1999 Techno Violet/Dove M3
Auto/Convertible and staying stock!
You need to use a timing gun and verify physically what timing your engine is seeing vs. what the ECU is reporting.
Also I agree, putting 2 deg. past 200 doesn't make any sense and might be the reason you're seeing timing retard. Put a more sane number in there instead.
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