lan_evo_mr9

iTrader: (10)

Autometer mechanical boost gauge is what I'm using. Don't have the funds for the map sensor. I definitely need one if that's the case. Well anyways, the boost taper is margins less, and the car feels strong.

Edit: Just did a second gear pull with my eyes locked on the gauge and it did drop to 23-24psi. Oh well, thought I was on to something.

GST Motorsports

iTrader: (8)

never say impossible.

Jeff_Jeske

iTrader: (66)

I can hold that boost all day long with the stock exhaust on there! But once uncorked it gets tricky again.

I've had the opportunity to see quite a few custom vendor tuned mivec maps. MFREDS newest map with 28s dropping to 22s is almost identical to a DYNOFLASH. The only difference is that Dynoflash didn't use the 28s anywhere. Stock turbo.

GST Motorsports

iTrader: (8)

It has a full 3" exhaust and bullet muffler, but yes on a 9 it is a bit more tricky.

People also have to remember more boost held does not always mean more power.

lan_evo_mr9

iTrader: (10)

With running less boost but holding it better, it didn't give me more power at all, but it did help level out my torque, instead of the nasty drop off. Increasing the timing also helped with leveling the hp. For me, it's all about the power band. To each his own. I just love the feeling it has now- strong from start to finish.

mrfred

iTrader: (50)

The last MIVEC map I posted was still a work-in-progress. I was intending to try adding back in some 28.8 deg values at high load at around 3000-3500 rpm where the turbo is still in its efficiency range. I was also thinking of experimenting with pulling MIVEC down even further at high rpms and high load.

lan_evo_mr9

iTrader: (10)

MrFred- something like this maybe?

lan_evo_mr9

iTrader: (10)

Or this?

mrfred

iTrader: (50)

Yeah, something more like the second one where you made the transition away from 28.8 a little more gradual at low rpm and then taking away more at the higher rpm. When I think about it a bit, the 28.8 values at 2000 rpm and 300-320 load are meaningless though because I'm pretty sure no one ever sees that combination of load and rpm. It might be instructive to put a map trace line on your MIVEC map to create an operating envelope, and then see if the changes that you made can ever be encountered.

lan_evo_mr9

iTrader: (10)

With that second map, I would be hitting about 18-19 degrees at full load and then going down. I guess the question is - How much mivec advance do you want at full load? Do you think I should taper even more at higher rpm?

mrfred

iTrader: (50)

I'd try 28.8 in the cells encountered on the ramp to full load and then in the first cell at full load. Yes, I'd experiment with tapering even more in the traverse at the really high loads and rpms where the turbo is getting pretty far out of its efficiency range. You'll need to be very consistent in your "road dyno" runs to figure out what works best.

lan_evo_mr9

iTrader: (10)

So in theory I would want 28.8 to 4k to 320 load. After that it needs to die down, and fast. The mivec stops completely at 6k correct? So I have 2k rpm to wind it down from 28.8 to almost nothing. It seems as if the timing gaps would be huge with this rapid decel. Would that be OK?

mrfred

iTrader: (50)

There would be no gap or "steps". The ECU interpolates when its between cell points.

lan_evo_mr9

iTrader: (10)

I think this may work well.

mrfred

iTrader: (50)

That would be an interesting one to try.