[Malek@MRF]

Originally Posted by shiv@vishnu

The same signal (from the Crank angle sensor) it uses to read RPM is the same signal it modifies to advance/retard ignition timing. I cringe at the idea of giving this duty to the stock ECU since it should only be used as a last resort.

Shiv

I couldnt agree with you anymore already than to allow the stock ECU control timing based on knock.. Poor idea.. I dont tune this way either and never will because I have seen situations where catastrophic failure occurs.

Anyway, if its reading the CAS for RPM and IGN timing, how is it actually retarding the timing actively without directly being connected to the ignitor?

[OpenFlash]

Originally Posted by Malekreza11

I couldnt agree with you anymore already than to allow the stock ECU control timing based on knock.. Poor idea.. I dont tune this way either and never will because I have seen situations where catastrophic failure occurs.

+1

Anyway, if its reading the CAS for RPM and IGN timing, how is it actually retarding the timing actively without directly being connected to the ignitor?

We adjust timing by phase shifting the crank angle sensor waveform. It's like adding or subtracting mechanical advance by rotating the crank trigger wheel. But from electronically and from the sensor/signal side.

Another option, which we stopped using years ago, was by modifying the signal going to the coils. This worked too. But it needed to lead to premature coil failure. I've always found this to be an unnecessarily "sloppy" approach. It also interferes with the factory knock control system which is also bad.

Shiv

[Malek@MRF]

Originally Posted by shiv@vishnu

+1



We adjust timing by phase shifting the crank angle sensor waveform. It's like adding or subtracting mechanical advance by rotating the crank trigger wheel. But from electronically and from the sensor/signal side.


Shiv

Cool enough, makes perfect sense. Almost like a modern old school way if you know what I mean. (ala distributor, heh)


Have you done any proto testing to see how the ecu responds to simply increasing boost pressure without any other remapping?

[OpenFlash]

Originally Posted by Malekreza11

Cool enough, makes perfect sense. Almost like a modern old school way if you know what I mean. (ala distributor, heh)


Have you done any proto testing to see how the ecu responds to simply increasing boost pressure without any other remapping?

Yep... it trims back timing through adaptation. The only problem with this approach is not only is it reactive (upon first installation), it also directly chops away at the safety margin/timing retard range the car comes with from the factory. This seriously compromises the car's adaptability when faced with adverse conditions.

Shiv

[scalbert]

Originally Posted by shiv@vishnu

Another option, which we stopped using years ago, was by modifying the signal going to the coils. This worked too. But it needed to lead to premature coil failure.

I hope the coils of those guys running the E-Manage I set up for the Acura/Honda J-Series are still doing fine.

It was just for under boost retard as any advance imediately set misfire codes.

[scalbert]

Hrmm, this dyno might make me rethink about not getting DP's.

[tek818]

Originally Posted by scalbert

Hrmm, this dyno might make me rethink about not getting DP's.

+1.. although I always had the thought in the back of my head that the final decision would be made once I saw shiv's dynos

[chris b.]

me too. so happy he got them. now we need high flow cat dp's and im set

[A418t81]

Nice numbers for 91 Shiv I remember back in the day when the Evo guys would smoke their coils out with the Emanage. Pretty sure the N54 is a 60-1 trigger, would be interesting to see somebody throw a boost referenced MSD on the car.

[doba_s]

Originally Posted by Riss Racing

Great work Shiv! Riss Racing DP + Vishnu V2 is a nasty combo

don't forget to add Forge DVs to hold that boost

[stillclaimndp]

Originally Posted by doba_s

don't forget to add Forge DVs to hold that boost

this has been shown to be unnecessary, stock DV's hold 25psi per Terry's testing, pretty simple test can't really screw it up... perhaps it doesn't show longevity, however.

[Former_Boosted_IS]

Originally Posted by Malekreza11

what is the A/F ratio at 14ish PSI of boost? Considering the direct injection and 10.2 compression ratio of the motor makes it beneficial to make power and all, what is done about the ignition timing since it is not directly controlled? Is the knock prevented by the pro-cede unit by richening up the fuel mixture around peak torque, or is the stock knock control doing the work?

Guys, I was over at IS300.net once and Malek is not a troll at all. He was a very valuable member over there and I am sure will be here as well. Welcome Malek.

[v2bling]

Originally Posted by kaji335i

Hi Terry.

What a ***

[BMW_TT]

Originally Posted by Former_Boosted_IS

Guys, I was over at IS300.net once and Malek is not a troll at all. He was a very valuable member over there and I am sure will be here as well. Welcome Malek.

I can vouch for that as well, used to be an IS owner.


Oh yeah almost forgot. This has been a great informative thread so far. We need more threads like this.

[N54YO]

This thread is great. Very informative and great work Shiv. DPs sure sounds like a tempting idea. I think I'll just stick w/ the stock DP however (for now at least). I think w/ just V2 and your Intake will be enough for me. Not looking to be the top of the hill here.

[XLR8MF]

where's the map?

[O-cha]

lol.

[E90ice]

Shiv, will this map work for catless cat-back?

What about stock catless DP's?

Thanks!

[bullmrkt]

bump for updates

[jcarlucci1]

Originally Posted by XLR8MF

where's the map?

Haha..six months until you see that map

[down4it]

I havent seen Shiv on the boards this past week so im sure he's cookin somethin up over there... I assume the Beta testers will see the map in the next week or so, soon after that it will be released to everyone

[retrodrive]

Originally Posted by down4it

I havent seen Shiv on the boards this past week so im sure he's cookin somethin up over there... I assume the Beta testers will see the map in the next week or so, soon after that it will be released to everyone

You are right. I feel like the less I see Shiv on the boards, the more value I am getting. He is either doing a writeup on the data-logging or tuning.