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Weird fuel tri.s
- Thread starter Sting_em
- Start date
BMS says expected values for fuel trims are a spike to mid-40s at peak torque, then a taper down to around 25 (no adjustment, I believe) by upper revs / peak power. I don't have my full excel view here but it looked like you were seeing a similar trend (think I saw a 50, but you're in map 4 running E30, I assume, so maybe needing a bit more at peak demand).
Im running closer to e45 since I can only get 91 around me. But thanks for the info. Just seems like more demand up in higher rpms. Or if I had a possible vacuum leak. Everything in my logs look good then?
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That's good from an octane/knock standpoint (your "ign" values, which are timing pulls, are clean), but would also increase fuel demands. But the trims look normal to me, and your high pressure (fp_h) never drops below 10 so I don't think it's an issue.Im running closer to e45 since I can only get 91 around me.
"E30" is really just a guideline that works for most of our cars, providing enough octane increase (and cooling etc) to run higher boost without hitting the HPFP limits, but it's not a super sensitive value. So E28, E36, etc are typically fine, and some guys have pushed it to E40-E50, you just have to be aware you're closer to the car's limits.
I was just thinking their might be a vacuum leak. But thanks for the information! I've run pretty high ethanol content. 50+ and the fuel pump never drops below 10. Possible aftermarket hpfp? I got this car with no history really.
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I doubt there are more than a handful of those, and only on cars where other mods would make it obvious. You may just have a car that tolerates a bit more, or through a combination of atmospheric conditions, map setting, etc hasn't demanded enough fuel for a HPFP crash.Possible aftermarket hpfp?
I'd back it down toward E30 and see if you get timing corrections. If not, you don't need the extra octane. Mine is happy on Map 5 with E30.
Ok I'll give that a try. If you can run map 5 with E30 is there a point to running CPI? Thanks for the feedback!I doubt there are more than a handful of those, and only on cars where other mods would make it obvious. You may just have a car that tolerates a bit more, or through a combination of atmospheric conditions, map setting, etc hasn't demanded enough fuel for a HPFP crash.
I'd back it down toward E30 and see if you get timing corrections. If not, you don't need the extra octane. Mine is happy on Map 5 with E30.
For me there isn't right now, but if you're trying to max out the stock turbos, and need higher ethanol levels for the octane+cooling, you tend to run out of HPFP capacity. CPI is port injection, from the low pressure line ahead of the HPFP, which isn't a bottleneck.If you can run map 5 with E30 is there a point to running CPI?
