I have seen 0 for both stft and ltft, in my logs and others
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I have no idea why you wouldn't see a LTFT (in OL) - unless you didn't leave it long enough to build one . I see one in practically every 8 i've looked at .
But i have seen the odd 8 that didn't build one and that did MY head in LOL |
its just different ways of getting the beast tuned,
however a note, the mazdaspeed 3 and 6 play with 170% load stock and modified they are as high as 230% calc load. 200g/s (26.4lbmin)(60)/(10.8)(BSFC(.65 rx7club.com)) 225hp = 186whp 270g/s (35.7lbmin)(60)/(10.8)(BSFC(.65 rx7club.com))== 305hp = 253whp 400g/s (52.9lbmin)(60)/(10.8)(BSFC(.65 rx7club.com)) 452hp = 375whp 17% drivetrain loss |
Originally Posted by FazdaRX_8
(Post 4457270)
its just different ways of getting the beast tuned,
however a note, the mazdaspeed 3 and 6 play with 170% load stock and modified they are as high as 230% calc load. 200g/s (26.4lbmin)(60)/(10.8)(BSFC(.65 rx7club.com)) 225hp = 186whp 270g/s (35.7lbmin)(60)/(10.8)(BSFC(.65 rx7club.com))== 305hp = 253whp 400g/s (52.9lbmin)(60)/(10.8)(BSFC(.65 rx7club.com)) 452hp = 375whp 17% drivetrain loss |
220g/s
(26.4lbmin)(60)/(10.8)(BSFC(.72 rx7club.com)) 225hp = 186whp 270g/s (35.7lbmin)(60)/(10.8)(BSFC(.72 rx7club.com))== 275hp = 228whp 400g/s (52.9lbmin)(60)/(10.8)(BSFC(.72 rx7club.com)) 408.1hp = 338whp 17% drivetrain loss those numbers seem low to me but like you said its a rotory, you should get some of kma logs and enter them into VD or your program and see what the vd gets this assumes mazda made 220g/s a "real number" I don't think it is |
Originally Posted by FazdaRX_8
(Post 4457289)
220g/s
(26.4lbmin)(60)/(10.8)(BSFC(.72 rx7club.com)) 225hp = 186whp 270g/s (35.7lbmin)(60)/(10.8)(BSFC(.72 rx7club.com))== 275hp = 228whp 400g/s (52.9lbmin)(60)/(10.8)(BSFC(.72 rx7club.com)) 408.1hp = 338whp 17% drivetrain loss My feeling is that the % drivetrain loss is not linear and (the %) does reduce a bit as power goes up. |
Originally Posted by FazdaRX_8
(Post 4457289)
VD or your program and see what the vd gets
this assumes mazda made 220g/s a "real number" I don't think it is |
Originally Posted by Brettus
(Post 4457296)
If he wants to post a csv file I'd be happy to do that.
I do have VD installed on my computer, what settings do you use to get the most accurate result? IMO all these calculations are useless because we don't have a confirmed BSFC for the renesis, let alone a FI renesis. |
It brings a tear to my eye to see us argue about things like MFR, and BSFC.....*I'm so proud*
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Originally Posted by kma5783
(Post 4457344)
I'll post the log for that 4th gear pull when I get home from work later.
I do have VD installed on my computer, what settings do you use to get the most accurate result? IMO all these calculations are useless because we don't have a confirmed BSFC for the renesis, let alone a FI renesis. .72 seems to be a good number for BSFC. and in reality every single engine has its own BSFC, because it relies on the tune. Thanks kane :) |
Good stuff. Complicated it is.
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Originally Posted by FazdaRX_8
(Post 4457560)
its algebra dude, list your acceptable knowns and your unknowns then solve.
.72 seems to be a good number for BSFC. and in reality every single engine has its own BSFC, because it relies on the tune. Thanks kane :) The problem is you can't solve for 2 unknown variables in that equation, BSFC and Horsepower. Now once you put a car on a dyno and have a HP figure you can go back and calculate the specific BSFC for that engine. Point is, these equations are nothing but crude estimates. For every .01 that your estimate is off on the BSFC it's a 4+hp difference on the 270g/s example. |
1 Attachment(s)
Brettus,
Here's the log for that 4th gear pull. |
Originally Posted by kma5783
(Post 4457784)
Brettus,
Here's the log for that 4th gear pull. My ME licence just expired (long story) . Hope to have it back in the next few days all going well . |
Originally Posted by Brettus
(Post 4457786)
Shit
My ME licence just expired (long story) . Hope to have it back in the next few days all going well . What about settings in VD, I can input it into that. |
I'm kind of curious as to why my calc load is so low though?
4th gear WOT and max calc load was 135% Edit: I'm wondering if I have a small boost leak, we had the idle FT's good, but I've started to develop a negative fuel trim at idle, about -5-6 LTFT, but my cruise FT's are good. Nah, can't be a boost leak, AFR's are too good going into boost for that, my wideband shows a 10.9AFR under WOT. It would be way more rich if it were a boost leak, right? |
Also, here's a short 1st to 2nd gear pull from Saturday night...
http://i444.photobucket.com/albums/q...ps77221adf.jpg |
Originally Posted by kma5783
(Post 4457788)
I'm kind of curious as to why my calc load is so low though?
4th gear WOT and max calc load was 135% Boost is quite low though so load will be low . |
Originally Posted by Brettus
(Post 4457814)
G/s are a little on low side per your reported boost but that could be just that your boost gauge is over-reporting slightly or maf under reporting .
Boost is quite low though so load will be low . What are your thoughts on the -6 LTFT at idle, but FT's being fine every were else? Just MAF scale right around the idle voltage? |
1 Attachment(s)
Logged another 4th gear WOT run with almost identical results.
Attachment 226464 Time to make some small changes to the Fuel VE Table and Throttle AF table. |
what are you using to make those graphs?
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Throttle tip is is good!
What real AFR's are you seeing? |
your Maf could just be undereporting which can be a good thing. the graphs look good.
if your maf scale is right and your getting negative fuel trims your injector bank 1 scale might need tweaked. but the cold weather could be messing with it too. it could also be your gauge, I have seen this same issue, I thought I was around 10psi, Per my gauge, sense I started getting mine back on the road, started fiddling with the ebc and it claims I am only at 8psi. |
Originally Posted by FazdaRX_8
(Post 4458755)
your Maf could just be undereporting which can be a good thing. the graphs look good.
if your maf scale is right and your getting negative fuel trims your injector bank 1 scale might need tweaked. but the cold weather could be messing with it too. |
Yeah boost gauge readings are a PIA.
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