200whp with stock N/A rotating assy?

[FredK]

i expect than M50 junkyard swaps into an E30 will cease from this point forward;)

Yeah! I'm just thankful M20 development has continued. With the RHD ITBs, the possibilities are nearly endless.

It makes me want to do an M20 stroker!

[ForcedFirebird]

Yeah! I'm just thankful M20 development has continued. With the RHD ITBs, the possibilities are nearly endless.

It makes me want to do an M20 stroker!

My JY m50b25 with 45mm ITB's vs the modified head/cammed m20 with 40mm ITBs...

I will take the single cam all day :D

[squidmaster]

Huge improvement! Love it!

[Bullhead]

This thread has been a pleasure to follow and those are some nice numbers on the "ain't worth nothing" M20, Kudos FF.

[AWDBOB]

Great results! Did you ever get an idea of what pricing would look like for the ITB set, John?

[ForcedFirebird]

Customer brought the car back to do a 2.8 stroker, almost a year to the day later.

The fresh 2.8 REALLY woke this thing up, gains everywhere. Went to the dyno today and top power was 211whp/198wtq with more left in it, but the injectors are at 126.6% duty using 19lb - 100% duty at 5500 as you can see in the AFR graph. For some reason I never even thought about the injectors (partly because I didn't think it would make this much). Goes to show you how much better sequential fire is, as I have been to 223whp with 17lb in an e36 with some room.

Brought the FauxPro and mount this time, so got video. Will post a link once it's edited.

Here's the graph so far...



Time for some bigger injectors and a another trip to the rollers.

[Kershaw]

Nice!

[LJ851]

That looks really nice!

How come the torque graph shows 200+ ftlbs but the max torque figure is only 198?

[ForcedFirebird]

That looks really nice!

How come the torque graph shows 200+ ftlbs but the max torque figure is only 198?

Not sure why it looks like that on the screen shot, doesn't in the dyno software. Replaced it with one that's more clear.

Better screen shot that includes the pull before we started any work.

[digger]

That looks really nice!

How come the torque graph shows 200+ ftlbs but the max torque figure is only 198?

the original graph posted had the torque and hp scales different, the torque scale was on the right and it read correctly but slightly confusing

170ft-lb at 2500rpm and no vanos in sight.....

[ForcedFirebird]

the original graph posted had the torque and hp scales different, the torque scale was on the right and it read correctly but slightly confusing

170ft-lb at 2500rpm and no vanos in sight.....

It's a hoot to drive. Maybe I can convince the owner to let me do some laps in it. Need to compare this to my s52 graphs :)

[ForcedFirebird]

The graph below is a comparison of a modified s52 vs this m20. Now I really can't wait to go back! We only did a few pulls, so the m20 graph will be much smoother.

s52:
VAC stage 2 head
Sunbelt cams
generic long headers
m50 manifold
10.5:1 forged pistons
TRM tune

[LJ851]

the original graph posted had the torque and hp scales different, the torque scale was on the right and it read correctly but slightly confusing

170ft-lb at 2500rpm and no vanos in sight.....

The first one John posted had equal HP and torque scales and showed about 204 torque. The edited graphs match the peak numbers.

John, i am really impressed by the m20/mod s52 comparo, what are m20 specs?

This motor seems like it would be a hell of a lot of fun !

[ForcedFirebird]

The first one John posted had equal HP and torque scales and showed about 204 torque. The edited graphs match the peak numbers.

John, i am really impressed by the m20/mod s52 comparo, what are m20 specs?

This motor seems like it would be a hell of a lot of fun !

Looking back, I didn't have the force scaling correct in the software. Digger is correct, the right side and left side scaling in the graph didn't match. The edited graph (actually screen shot) is correct.

[digger]

The graph below is a comparison of a modified s52 vs this m20. Now I really can't wait to go back! We only did a few pulls, so the m20 graph will be much smoother.

s52:
VAC stage 2 head
Sunbelt cams
generic long headers
m50 manifold
10.5:1 forged pistons
TRM tune

looks a little soft for an s52 with forged slugs, cams and headwork??

people shouldnt underestimate the sewing machine its amazing what the new intake setup has done for the potential of the m20, Rama nailed it on the head. by looks of it the more cubic inch you throw at it the better,seems to be getting closer to the sweetspot of the topend components plus i guess it seals up a whole lot better to