[QUOTE] It seems pretty logical to me anyway that you could expect higher boost levels from the "stock" pulley on an AP1 versus an AP2Even though the engines have differences in compression, displacement, cams and header, the speed of the blower is ~13% higher on the AP1 with the same pulley.

 

[QUOTE=MugenRioS2k,Jul 14 2009, 08:08 AM]

 

Good data there WLAURENT

This is telling me that I need to get my hands on a AP1 TPS voltage VS MAP voltage ramp and determine the necessary range where the AP1 actually goes into open loop.

Similar to what I have done on the AP2 tunes.

The data you posted up tells me that I need to create a AP1 TPS voltage ramp map inside the ULT so those with A/F feed back can let it do its job in the area around boost tip in when there is going to be major changes in evolution..

 

And FWIW I am at about 700ft elevation most of the time.

 

did you put the stock exhaust back on...

I am designing an exhaust to complement the roots setup.

I have been talking to my dynomax buddies getting some technical info.

most likely will be a
70mm (2.75" ) to dual 57mm (2.25")
however would prefer a 50.8mm (2") dual to maximize exhaust velocity sine the dual 2" has only 0.25 square inches more flow area then the main pipe so the delta velocity will be very close to 0 across the exhaust length.


Or
a 76mm (3") to dual 57 (2.25")


Still need to work out the heat transfer numbers, delta density and flow velocity changes vs length..



The main muffler / resonator can support + 2200CFM ( standard flow test at 20.3" H2O)


and each of the rear mufflers can support +1300CFM


hummm 2200CFM = that would support just around 1000hp.

 

If you do make an exhaust can it not be a melon shooter style? Or at least a version of each style - stockish and melon shooter.

 

No still fuji, I let my install friend take his awarded test drive after helping me. I tried to get him to play nice but he hammered it a few times and it saw 9.6 psi.

I don't know under what conditions the run that created the 11.2 reading, just that I did a few pulls and then checked the peak hold and saw 11.2.

I am a little less worried now that my friend beating on it could not get it to 10 psi, because I drive it far more easy than he was. The 11.2 could have been a fluke, but I am just curious how the EMU will handle temporary conditions that may go beyond 10psi if I could hit serious trouble with the base map. I would think the wideband fuel setup is fine for gas, but its timing that would concern me.

I am putting the stock back on and just leaving it for good. The fuji has quieted down some, and is not that bad actually, but I think I just want my speed and peace and quiet.

I did get a very small "pops" out of the exhaust when the friend was hammering it, not sure if that is a mini backfire or not, but prefer to just get the stock back on, reset the ecu, have it relearn and go from there.