'93 VR4 State of the Union

[Greg E]

As far as I know, nobody has pushed it to it's limit so nobody knows yet.

That's because the limitation isn't in the ECU, it's the MAFs.

Run a MAF that goes beyond the limitations of an EVO MAF (which in itself isn't even known), you're set for life.

[AdamVR4]

A. Cost
B. Community Support
C. Always something in the works for it
D. Supporting the members who made it what it is (A fellow Texas 3S member sells his own kit)
E. Ease of tuning (Seems way easier then AEM)

...

As far as I know, nobody has pushed it to it's limit so nobody knows yet.

Once I max these 1000cc inj's out, I will be swapping to chrome and 2000cc injs

I really don't want to let 'A' or 'D' influence this decision. 'C' seems like a minor inconvenience to me, actually... Between Ray, Grayson, etc, I think I have enough community support to keep 'B' from being an issue as well.

You're going to max out 1000cc injectors on what? E85 + piggybacks? Why not start out on the Chrome or make the swap to Chrome right after you get your engine running / broken-in?

[AdamVR4]

That's because the limitation isn't in the ECU, it's the MAFs.

Run a MAF that goes beyond the limitations of an EVO MAF (which in itself isn't even known), you're set for life.

Thanks. I figured it would be the MAF's ability to count air that would get maxed out. What's the most power documented through an EVO MAF?

[Greg E]

Mellon did well over 700 whp with it. The thing to be wary of is at what point do the turbos draw a vacuum in the intake tubes because the sensor itself can't flow the air.

I so badly wish my car was ready so I could continue to do more testing and show results to you guys. A theory I'm working on is that a hacked stock MAF can be a better alternative to the EVO MAF.

[TurboSinceBirth]

Took me a minute to realize you meant speed density... I don't think my LT1 MAF in blow thru is much of a source of pressure drop, so I don't see this as a major advantage. That said, how many high power 3S's or DSM's run blow through MAF's? Are there any beyond 700 WHP?


Are the fail safe and flex fuel option the only features the AEM EMS s2 has over the Chromed ECU's?

Matt ran a Ford Cobra sensor in a C&L 80mm blow-thru housing to 1093AWHP with more room to go so I'm sure running a big enough MAF in blow-thru is no issue. I ran close to the same maf in a slightly smaller housing using the same location post intercooler and had no issues once I was able to get it not to leak boost.

They're not the only features but I don't know the software enough to give them all. You can ask Greg about the switchable maps, flex fuel capabilities, and external sensor compatibility since he tested it.

[AdamVR4]

Have you ever looked into the Rush Racing Antilag box? Rush Racing Development It builds boost instantaneously like a "real" 2-step/antilag. I have the older single-button version and it works amazingly well. On the stock twins at would build 15psi at 4800RPM in about 2 seconds; on the 6266 it will open the wastegate and shoot a nice fireball under the car almost instantly.

I should have listened to you from the beginning. I'll yank the WOT Box and give this unit a shot.

[anyonebutme]

AEM's timing retard 2-step. Can build as much boost as you want without all the plug fouling and annoying popping noise. IIRC Bill's car will build 20+ psi on DR1300's on the line if he wants.. The trick is to retard the timing, not cut it. I've been trying to emulate the settings in chrome but haven't got very far, it keeps cutting the ignition before the retard kicks in enough to hold the RPM. I have too much on my plate right now to get with Greg and figure it out. As of right now, the Chrome 2 step fouls my plugs instantly.

[Chris@Rvengeperformance]

That's weird the deafailt chrome 2 step settings worked fine for me.


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[aaronatstate]

AEM's timing retard 2-step. Can build as much boost as you want without all the plug fouling and annoying popping noise. IIRC Bill's car will build 20+ psi on DR1300's on the line if he wants.. The trick is to retard the timing, not cut it. I've been trying to emulate the settings in chrome but haven't got very far, it keeps cutting the ignition before the retard kicks in enough to hold the RPM. I have too much on my plate right now to get with Greg and figure it out. As of right now, the Chrome 2 step fouls my plugs instantly.

If it fouls your plugs instantly, something is wrong. I've done countless 2 step tests for Greg and have not once fouled my plugs.

[anyonebutme]

insta Subaru:

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