Isn't it the other way around? Without the rescaling, the IDCs stay the same as stock injectors because the ECU has no idea that there are larger injectors, and because of that, the car runs super rich.

 

Anyone that has had this problem hasnt included the data "I also bought the recommended Walbro install kit". It doesnt seem to be widely publicised (and I dont know if anyone read the thread Codgi listed...I know Jeff personally) but the install kit comes with a different washer that affects how the pump sits in the housing. Without the new thicker washer it doesnt work right and problems like this happen. Ashumo and JeffR both faced this exact issue (the original, I am not sure if this the same thing that KO is experiencing) and resolved it by buying the additional install kit.

Food for thought.

 

I wrote it confusing and in a hurry, I should have said the larger injectors without being scaled cause richness. My apologies.

 

This is a REALLY good point.. When I did my Walbro pump swap, I originally assembled it without the installation kit, and it sat LOOSELY in the housing, I could see where pressure or air could bypass the pump and end up with low fuel pressure (or inconsistent pressure) or at best, a very noisy pump because it was loose. I promptly took it apart and used the installation kit with the rubber insulator and all the correct install parts and it fit snugly.

I can see this being a possible explanation.

 

No prob. Just wanted to keep the facts straight. :-)

 

was this issue ever resolved? I've been doing some logs on a bone stock ix (jdm) and from 6000rpm onward I'm seeing 80% - 100% idc.

I'm seeing boost as 17-18.5psi via JDM MAP.



I don't know if this is of any corresponding relevance, but knock sum is off the charts as well....although all 3 timing maps are the same and very conservative at that.



When the knock is map traced via 2byte load, the engine is hitting load cells in the 200-220 range from 4500rpm to 7500rpm. I should be seeing Ignition Advance interpolated within a range 1*-9* from 4500rpm onward.

Yet, the timing as logged in evo scan seems to be quite above that. If I take into account that the ecu pulls 1* of timing for every 3 counts of knock, the ecu is shooting for much higher timing than what's been ordained in my 3 high octane ignition tables.



The car is having a wb02 installed soon, so I'll see how the afrs look. Think the fuel pump is the culprit? Even so, why is my timing so off causing ridiculous amount of knock?

 

That jump at 6900 or so is the Lean spool turning off. Bump up the lean spool deactivate from 7k to something like 7800 or something and you won't see that huge jump in IDC up top.

 

JB had suggested elsewhere to take IDC and then multiply by a scaling factor (scaled injector size/actual injector size) from what I remember. For the stock car it would be 513/560 = 0.916.

That seems to give more realistic IDC numbers.

 

^Can anyone else confirm this?

Razor lab, thanks, I'll make sure to increase it.

 

I think we determined after extensive discussion and someone (JC I think) using a IPW meter independent of Evoscan that in fact it was correct. Now the thing I dont understand so much is that why will one car with the exact same mods as the next (on stock injectors) have 5-8% difference in IDC's at the same power level? I have seen pumpgas beasts make 370whp on a DynoMite (reads higher than a mustang but lower than a DJ) on stockers in the 95% range at 11.5 AFR and other cars in the 100's at lower boost at the same AFR?

cliffs-I wasnt correct so far as we can tell

 

This is what I use. Seems to make sense as my injectors otherwise seemed maxed out yet could add fuel at 100%+. IDCs went from 100-103 to the 90% range.

 

Interesting. Of course that still doesn't fully explain how it is able to go above 100% but you can still richen the AFR.

 

True. I dont know so I cant comment. Apparently its not accurate but I cant say that my thought on how it calculates is correct either.

I guess it was modesty poking trough trying to make sure that no one thought because I said it, it must be.

 

Fair enough

 

Not to burst anyone's bubble but I think I heard it from tephra. Does it really matter if it is one ecu guru or another? We owe alot from many who have really brought this forward. Remember the not so distant dark ages of the techtom and ecutech monopolys???