Basically, I'd like to look at some other peoples data, specifically at WOT from 5300-redline.

With my setup I'm hitting 19.5-21psi boost in that range and it's making a hump in my AFR where it goes from low 11's to 13.2 in that rpm range. Unfortunately, I don't have the add-on fuel pressure sensor, so I'm having a hard time telling what's happening. Basically, as soon as I pass 19.3 psi, it starts to go lean.

I'm fully aware that NW has the adjustable fueling kit, but I really don't like the complexity of it. I would think with the Walbro 255lph pump and 550cc injectors, I would be able to get this tuned properly. My next thought is that I might need the 55 fuel pump, but really don't want to throw any more money at this.

Any help/suggestions would be great!

 

One unknown in my setup is the fuel filter/ FPR. I replaced it a couple years ago with a supposed OEM MANN filter. My receipt just says "OE Fuel Filter for SLK230/320/32". No clue if it is the updated version or not.

 

Alan, here is a datalog from a 1/4 mile pass of mine in June. Hopefully you can read the small print.

I have a 62mm pulley, not tuned. Walbro 255 lph pump, 6an lines, regulator-less filter, adjustable fpr. The afpr is set at the factory pressure (58 psi). I have been watching the fuel trims and they are 1% and 3%, so I think I am going to turn up the afpr 1-2 psi. I would rather the ECU be pulling a little fuel than adding.

I only see 18 psi max boost at the top of 3rd gear. I have a very open exhaust, so I wonder if that accounts for the lower boost? The most I ever saw on the stock pulley was 14 psi.

I always see the 35* rise in IAT during the run, almost regardless of what the starting temp was. This run was "hot" with no ice in the ice tank, no fans or auxiliary cooling.

I also always see the dip in AFR between 5900 and 6100 RPM.

06052013log_zps4e60e42e.jpg

 

sorry to not have kept notes....Boostmonkey - do you have the stock HX or the supercooler?
The image is very small and subsequently the text is hard to read/decypher for any value other than indicative.
Any chance of a reload?

 

Thanks Boost. Unfortunately, there are way too many variables in your example to help me diagnose my issue. You're running a different fuel pressure and open exhaust. Are you running a SuperCooler or anything for cooling mods? I'm seeing a ridiculously high Air Intake Temp rise during racing. It went as high as 199F with the ambient temp being only 70F. My 1/4mi MPH was also greatly reduced compared to pre-winter mods. I've got a lot to sort out, but it will have to wait til after vacation...

 

You need one of these:

 

With stock heat exchanger and the NW 61.9 pulley I see approximately a 50F increase in AIT's from launch to completion of the 1/4 mile. By the way, this is the same as when I had the NW, Eurocharged, and no-name brand heat exchanger installed. As a result, I'll be leaving the stock heat exchanger and shroud stock.

Shoot me a PM with you email address and I'll send you some datalogs before the nitrous. Attached is a zip file of the 11.3 run with a 75 shot running the EC 61.9 SC pulley, Single NW, 550cc injectors, stock HE, SL55 pump, and Buckhead Imports tune.

Take a look at the link below, as it's what I think you're going through.

https://www.crossfireforum.org/forum...ved-again.html

 

You are right, that is very hard to read. Below is a link to the datalog image on photobucket. There is a zoom-in button in the lower right corner of the image that will allow you to read the text.

06052013log_zps4e60e42e.jpg Photo by superboostmonkey | Photobucket


I have the following charge air cooling mods:

• dual OEM front heat exchangers in parallel (thanks 32krazy!)
• "baked potato" IC. Intercooler wrapped in foiled-faced fiberglass insulation, metal taped edges, secured with safety wire, metal coolant lines to/from IC in insulating sleeves.
• isolated cooling systems
• 7 gallon ice/water reservoir tank mounted in trunk
• dual Johnson CM30 IC pumps. One in stock location, one in trunk, drawing from tank
• 3-way valve to use or bypass front HXs on hot water return to tank (bypassed when running ice water only)
• override switch to optionally run both IC pumps and radiator fan at full speed

Without using ice or the fan override swith, a typical "hot" 1/4 mile pass for me is starting IAT of 110* F, ending IAT of 145*F.


With ice typical temps are: starting IAT 48* F, ending IAT 95* F.


ALan, I know our cooling mods are pretty different. look at the AFR curve. I actually have a dip in AFR from 5700 to 6000 RPM.