yoda598 Posted December 1, 2020 Share Posted December 1, 2020 hey guys, having some issues with my car. im running bosch 1680cc (indy blues) injectors. it has a gfb reg at 4bar, a walbro 460 with upgraded wiring. my cruise trims are pretty spot on. if i dial in my WOT fuelling perfect, the next day its either crazy lean or crazy rich. i cannot figure this out. fuel pressure raises on boost as it should. does anyone have the data for these so i can see if ive gone wrong somewhere. files attached for a looksie HACCEG3 stock no changes 1680cc chasing me tail check trims.tec Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted December 1, 2020 Share Posted December 1, 2020 Fuel filter nearly blocked or pump on the way out could be something to look at. Have you verified that the fuel pressure rises the whole time through the rev range? Anyhow there's a couple of things to check. Quote Link to comment Share on other sites More sharing options...
yoda598 Posted December 1, 2020 Author Share Posted December 1, 2020 Brand new pump, filter isnt too old but I'll change it again as a precaution. Yes, watched the gauge rise on the dyno. Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted December 1, 2020 Share Posted December 1, 2020 What does your fuel pressure do across the wot run? Is it flat? What do you mean it rises? Quote Link to comment Share on other sites More sharing options...
yoda598 Posted December 1, 2020 Author Share Posted December 1, 2020 Raises in conjunction with boost pressure Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted December 1, 2020 Share Posted December 1, 2020 Are you trying to make 1000hp? If not put the standard regulator back on. 1680cc is huge Quote Link to comment Share on other sites More sharing options...
yoda598 Posted December 1, 2020 Author Share Posted December 1, 2020 4 minutes ago, Roland@pcmtec said: Are you trying to make 1000hp? If not put the standard regulator back on. 1680cc is huge Maybe One day Haha Yeah I only use the gfb one so I can watch the pressure Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted December 1, 2020 Share Posted December 1, 2020 Here's something to think about... If the tune is the same and the fuelling changes day to day, it points to a mechanical fault. Once a car is warmed up it should do the same thing on the dyno repeatedly. 1 Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted December 1, 2020 Share Posted December 1, 2020 Exactly. Put the stock reg back on it and check all the return lines are run correctly. Quote Link to comment Share on other sites More sharing options...
yoda598 Posted December 1, 2020 Author Share Posted December 1, 2020 Will do. Quote Link to comment Share on other sites More sharing options...
BeerTurbo Posted December 2, 2020 Share Posted December 2, 2020 16 hours ago, Roland@pcmtec said: Are you trying to make 1000hp? If not put the standard regulator back on. 1680cc is huge how much hp are you aiming for? Quote Link to comment Share on other sites More sharing options...
yoda598 Posted December 2, 2020 Author Share Posted December 2, 2020 @BeerTurbo id like to see 500kw out of the next setup. I was trying to future proof by getting these injectors. Quote Link to comment Share on other sites More sharing options...
BeerTurbo Posted December 2, 2020 Share Posted December 2, 2020 36 minutes ago, yoda598 said: @BeerTurbo id like to see 500kw out of the next setup. I was trying to future proof by getting these injectors. couldn't you do that on 1000cc injectors on e85 ? i mean might come dam close to maxing out. Quote Link to comment Share on other sites More sharing options...
yoda598 Posted December 2, 2020 Author Share Posted December 2, 2020 It'd be close. Quote Link to comment Share on other sites More sharing options...
yoda598 Posted December 2, 2020 Author Share Posted December 2, 2020 I've got the wot matching the commanded now. We'll see if it changes tomorrow. Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted December 2, 2020 Share Posted December 2, 2020 Are you sure your wideband is working properly? Quote Link to comment Share on other sites More sharing options...
yoda598 Posted December 2, 2020 Author Share Posted December 2, 2020 8 hours ago, Roland@pcmtec said: Are you sure your wideband is working properly? Yes, matches the dyno perfectly Quote Link to comment Share on other sites More sharing options...
yoda598 Posted December 2, 2020 Author Share Posted December 2, 2020 I'm thinking it's heat causing fuel pressure to drop. That's why when it's the next day it's rich as. I'm not going to adjust it (it's rich again) and see if it comes good towards the end of the day Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted December 2, 2020 Share Posted December 2, 2020 Fuel pressure should never change with heat. If it is changing the regulator is faulty. You don't need to put crazy pressure through the system unless you are cheaping out with stock injectors or aiming for crazy power/boost levels. Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted December 2, 2020 Share Posted December 2, 2020 When you say rising rate reg, do you mean a boost referenced reg, eg it holds a flat pressure + boost pressure? Or are you saying its flat pressure + boost pressure * factor. As in the pressure will be more than the base + boost? Eg it is not a 1:1 ratio? If is above 1:1 ratio I'm not even sure how you'd tune this as it might not be linear. It sounds horrible and I'd highly recommend against this. Quote Link to comment Share on other sites More sharing options...
yoda598 Posted December 3, 2020 Author Share Posted December 3, 2020 It's is a gfb direct drop in unit. 1:1 ratio. Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted December 3, 2020 Share Posted December 3, 2020 Ok then that should be fine. How is the gauge set up, is it measuring the pressure differential of fuel pressure vs boost? Or is it measuring it vs atmospheric? If it is measuring vs boost it should be flat at 4 bar. Quote Link to comment Share on other sites More sharing options...
yoda598 Posted December 3, 2020 Author Share Posted December 3, 2020 measuring vs boost. i didn't adjust fuelling at all yesterday. just drove it and let it get pretty warm. it started off rich, then got to the point of matching my commanded fuel at WOT. but then i kept driving it. and it got leaner. my commanded is 0.80 lambda at wide open. when it got warmer (driving for two hours straight) it got to 0.84+ something seriously dumb is happening. Quote Link to comment Share on other sites More sharing options...
JETURBO Posted December 4, 2020 Share Posted December 4, 2020 How much fuel did you have in the tank at the start of this two hour trip vs the end ? what is significant about fuel density vs temperature ? what does ford allow for in this regard with a standard calibration ? Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted December 4, 2020 Share Posted December 4, 2020 Is your load changing? Is your map sensor pegged? This could be a tuning issue. Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted December 6, 2020 Share Posted December 6, 2020 On 12/4/2020 at 5:41 PM, JETURBO said: How much fuel did you have in the tank at the start of this two hour trip vs the end ? what is significant about fuel density vs temperature ? what does ford allow for in this regard with a standard calibration ? 1. ??? 2. Same as most stuff that gets hot and cold. 3. Mebbe soak time enrichment is doing it. Quote Link to comment Share on other sites More sharing options...
yoda598 Posted December 7, 2020 Author Share Posted December 7, 2020 All sorted. Was a combination of things. One mechanical issue (loose wire from relay). All seems well but we'll find out over the next week 1 Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted December 7, 2020 Share Posted December 7, 2020 Let us know how you get on mate 😁 Quote Link to comment Share on other sites More sharing options...
yoda598 Posted December 8, 2020 Author Share Posted December 8, 2020 A day later and all is well.. fuel is perfect still. Almost time to get back on the dyno and start adding timing 😆😆 Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted December 8, 2020 Share Posted December 8, 2020 On 12/7/2020 at 5:42 PM, yoda598 said: All sorted. Was a combination of things. One mechanical issue (loose wire from relay). All seems well but we'll find out over the next week What were the mechanical issues? Quote Link to comment Share on other sites More sharing options...
yoda598 Posted December 8, 2020 Author Share Posted December 8, 2020 Loose wire on relay, alt wasn't charging properly ect. Like I said Though, it's only been a day. Quote Link to comment Share on other sites More sharing options...
yoda598 Posted December 9, 2020 Author Share Posted December 9, 2020 Apparently I couldn't be so lucky. After some research I've seen that the Bosch 1680s I'm using have issues with heat.. apparently. I'll post a link shortly . Quote Link to comment Share on other sites More sharing options...
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