Logger shows over 100% injector DC. What now?

[Rob Rohr]

I am in the middle of tuning my 1G and may have found a problem

My last log shows the following Injector P/W #s:
19.23mS @ 6000rpm
19.03mS @ 6500rpm
17.95mS @ 6968rpm
18.72mS @ 7062rpm
15.90mS @ 7437rpm

According to the IDC chart at http://www.taboospeedshop.com/IPW2IDC.htm my numbers are somewhere between 95%-105% on this log. Example; Taboo says 17mS @ 7000rpm = 100% and I am at 18.72mS @ 7062rpm!! At times I have even run about 1-2psi more boost than what I had during this log! Is the Pocketlogger Inj. P/W data accurate?

So, I think it is safe to say I am out of injector (550cc) at my currect 40psi base fuel pressure. Am I correct in thinking that the next step is to bump the pressure up to about 45psi at idle and try tuning/logging again? I don't want to go up to 660cc.

Thanks

 

[Dan7040]

What turbo are you running and why do you not want to upgrade your injectors?

 

[CanadianTSi]

You can either pump up the Fuel Pressure or go to some 650's...

I would say some biggers injectors, since you are already running more FP then stock.

 

[Rob Rohr]

You can either pump up the Fuel Pressure or go to some 650's...

I would say some biggers injectors, since you are already running more FP then stock.

I am going to to 45psi first. It might help my timing curve to add some fuel pressure and back off the airflow signal since I want a little more advance.

FYI, this is a ported EVO16g with all supporting mods.

 

[Dan7040]

Ideally you want your IDC to be ~80%. If your IDC is 100+ I would give yourself the extra safety margin that 660's would offer.

 

[Syndicate13]

Jesus Christ those Evo 3 turbos must flow some crazy air. Just wondering does anyone have any hard data airflow numbers on one? Preferably on a stock intake tract 2G? So far I've been able to squeeze out 29 lbs min on pump on my small 16g.

 

[ShapeGSX]

I've been telling people that 550s were too small for an Evo III 16G for over a year, now.

Upgrade your injectors.

 

[Rob Rohr]

I've been telling people that 550s were too small for an Evo III 16G for over a year, now.

Upgrade your injectors.

Well I guess you were right I am going to go with larger injectors instead of cranking the fuel pressure on my 550s.

What IDC do you see on your EVOIII powered machine?

 

[ShapeGSX]

Around 84% IDC for 660cc injectors with a 12:1 A:F ratio.

 

[Royalty]

I am going to to 45psi first. It might help my timing curve to add some fuel pressure and back off the airflow signal since I want a little more advance.

FYI, this is a ported EVO16g with all supporting mods.

45 psi holy shit!!! is it me or is this alot of air. can my big 16g do this or maybe somethign close?

 

[coltboostin]

So, I think it is safe to say I am out of injector (550cc) at my currect 40psi base fuel pressure. Am I correct in thinking that the next step is to bump the pressure up to about 45psi at idle and try tuning/logging again? I don't want to go up to 660cc.

Thanks

No

Get the 660cc and enjoy lots O' timing.

 

[coltboostin]

45 psi holy shit!!! is it me or is this alot of air. can my big 16g do this or maybe somethign close?

Thanks I needed a laugh today.

45psi Base fuel pressure. You turbo and the evo16g could not make 45psi with the wastegate welded closed.

 

[Rob Rohr]

Get the 660cc and enjoy lots O' timing.

Already ordered and they will be in the car next week. Hope my tune gets better and I can fun a bit more boost