1987 BMW 325is going VEMS, then turbo

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Yep, you're right - 3 channels.

Wasted spark with a good coil should get you a long way, with Toyota 1JZ engines I understand that CDI is needed from anything over 1.2bar, there dont seem to be any hard and fast rules.

The trick will be incremental testing, try the wasted spark coils first, if you run into issues upgrade to CDI.

[danmartin]

Thanks Rob, yeah I was under the same impressions about when the need for CDI might arise, I will see how far the wasted spark will take me then upgrade when necessary.

[danmartin]

Well after so long of being lazy we finally got wasted spark installed after some hang ups

http://www.vems.co.uk/forum/index.php?topic=436.0

Anyway upped the boost to around 210-220 kpa and tuned, gonna up to 240 soon and see what its like...

[BenFenner]

At least post a picture Dan...

[gunni]

Saw the thread on E30tech, makes it look so easy :)

[BenFenner]

I'll give Dan some time to post his first dyno results. If he hasn't in a bit, I'll post it for him. =P

[BenFenner]

I guess it's up to me.

First run we stopped early because he didn't want to hit the rev limiter, so we stopped around 6600 RPM. Put down 446WHP and 350 torque lulz. Car does not choke, the torque curve is almost flattening out at the end. Next run we put down 463/363 around 6600-6700. It felt like a limiter or something, either the dyno wasn't set right or I had some spark blow out. Anyway due to the weird happenings the dyno graph is all screwy but you can tell what is real and what isnt. Final pull was 475/365 with the same story.

So yeah 475 WHP, I know with an MSD DIS-4 and a 7200 I can break 500 without a sweat. With more revs this thing will really put down HP. Not bad for a stock block with head studs eh?

This was done on a Mustang Dyno, so on a dynojet expect 40-50 hp more  :)

[goxxy]

Hi, nice work!
But what do you mean when you say stock block, it's compression ratio stock or did you change it?

[danmartin]

by stock block I mean its stock. The only thing done to the engine is the ARP head studs.

[gunni]

Can you post your intake temps for comparision reasons to similar M20Ã,´s.
if you have it at your various levels of boost increase.
I.e full run at 10psi, then 15psi and so on.

Thanks