M20 dyno results

[zaq123]

agreed. I went through the trouble to order all rockers available (less roller fancy ones), tested them with Rockwell hardness test files all that shit.. Long story short, OEM is the way to go. Get them...

[zaq123]

that makes sense. would be interesting to see what ign. timing and type of fuel he runs...

[zaq123]

it didn't say anything. And I didn't know what fluid was used for this Z3 rack. Considering one can got from ATF to CHF if completely flushed but not from CHF to ATF (seal issue), I put CHF in there as...

[zaq123]

It says STD in that graph on the bottom, not SAE. Considering STD correction inflates numbers by about 4% from SAE, still good numbers, ~ 224 whp and ~204wtg on perfect 21C day they ran it. It didn't...

[zaq123]

I rebuilt Vickers pump with OEM kit, CH11s. It's pretty simple process and no issues after the rebuilt, it turns Z rack on my car nicely.

here is a video from someone that should give you...

[zaq123]

Here is stock 3L n52 dyno from 2011 128i.

I think for the good old M20 to be there ain't bad at all, considering e30 is 500lbs lighter. This M20 has 7 less hp that peaks 400rpm earlier than...

[zaq123]

yeah. I'm not sure why it was knocking down low with my street tune, maybe shitty amc dome shape? It was very brief slight knock on the knock monitor once we got it on the dyno, nothin audible and my...

[zaq123]

Sorry, I actually messed up in my calcs haha, just noticed.
Anyway, I edited my original post to keep confusion to the minimum for anyone's future reference but the results are the same, 40mm...

[zaq123]

ITB size as recommended per RHD

• 40mm 265cfm 61Hp 350-500 cc/cyl
• 42mm 304cfm 70Hp 450-600 cc/cyl
• 45mm 362cfm 83Hp 550-700 cc/cyl
• 48mm 408cfm 94Hp 650-800 cc/cyl

so for 2.85L - 475cc/cyl
...

[zaq123]

40mm ones...

[zaq123]

AI can interpret dyno graphs no worse that it does X-rays ...

[zaq123]

do you still have that graph?...

[zaq123]

Ok it was a long late day when she was on the dyno so I misunderstood the tuner at the time. I tried to edit first post but the forum is acting up again.

So this engine isn't knock limited,...

[zaq123]

10k rpm is a little bit too much for stock parts....

[zaq123]

what rpm did it rev to when you mis-shifted? Stock rockers don't like to go past 7-7.2k with stock springs. If you shifted from 5k rpm from 3rd to 2nd, the engine was at about 7.8k rpm. 5k was just an...

[zaq123]

just over 0.9 mm smallest clearance to just over 1mm largest (measured different from cyl to cyl). I'm not sure what those small dips are near peak on the dyno, tuner din't mention it nor I've seen his...

[zaq123]

haha, this is awesome. Karl was like "what is Alpina?" . Unfortunately my 885 head was machined, 3 angle valve job done all that but was never pressure tested by the shop before all...

[zaq123]

M52B28 is 193HP. This Dyno is more on par with N52B30, 231HP (196WHP with ~15% loss for the drivetrain). 60HP gain from stock M20B25( about 35% jump) is not exactly WAR chip kind of mod....

[zaq123]

cam was set to Schrik Spec with adj. cam gear, 4deg. retarded....

[zaq123]

Just dyno'd this 2.9L 10:1 with Schrick 284/272, ITBs and completely original AMC head with Supertech valves and OEM springs/rockers. 93 octane (98 ron) gas.
Low numbers in the timing table (down...