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-   -   kma5783's Build Thread (https://www.rx8club.com/rx-8-multimedia-photo-gallery-6/kma5783s-build-thread-231905/)

shadycrew31 04-14-2013 04:22 PM
Weird I would see about 367 G/s when I was around 8psi.

Not sure what my new setup will flow but I am hoping to beat that.

kma5783 04-14-2013 04:26 PM
Originally Posted by shadycrew31 (Post 4457112)
Weird I would see about 367 G/s when I was around 8psi.

Not sure what my new setup will flow but I am hoping to beat that.
In what gear?

shadycrew31 04-14-2013 04:39 PM
Originally Posted by kma5783 (Post 4457113)
In what gear?
third and my calc load was nearly maxed.

Brettus 04-14-2013 04:41 PM
Originally Posted by kma5783 (Post 4457105)
On that log I was pretty consistent at 6psi, dropped off to 5psi toward the very end.
.
Oh - I thought you said 7 earlier . For 5psi 270g/s is within an acceptable range ....................... IMHO :)


Originally Posted by kma5783 (Post 4457105)

Don't know why, but it seems like we get caught up on G/S numbers too much on this forum.

.
It can be a good indicator to power if you correlate it with a dyno . But numbers do tend to be all over the place around here .

Brettus 04-14-2013 04:47 PM
Originally Posted by shadycrew31 (Post 4457112)
Weird I would see about 367 G/s when I was around 8psi.

Not sure what my new setup will flow but I am hoping to beat that.
That sounds a bit too high . Better to try get it as close to reality as possible IMO . Makes for a better tune and you don't run run out of max calc load till you are up close to the 400whp mark.
somewhere around 13-14psi at peak rpm

shadycrew31 04-14-2013 05:08 PM
Originally Posted by Brettus (Post 4457116)
That sounds a bit too high . Better to try get it as close to reality as possible IMO . Makes for a better tune and you don't run run out of max calc load till you are up close to the 400whp mark.
Yea this was on the previous tune, I am taking it up to Steve once I have an EBC and can confirm the compression is on point.

kma5783 04-14-2013 05:15 PM
Originally Posted by Brettus (Post 4457116)
That sounds a bit too high . Better to try get it as close to reality as possible IMO . Makes for a better tune and you don't run run out of max calc load till you are up close to the 400whp mark.
somewhere around 12-13psi at peak rpm
Yes you can calculate estimated horsepower based on Air Flow...

General rule of thumb is MFR(Mass Flow Rate)(Converted to lbs/min) x 10

The Actual Calculation is (MFR)(60)/(AFR)(BSFC(Brake Specific Fuel Consumption))

So...
270 G/S converted to 35.714lbs/min
35.714 x 10= 357.14bhp

kma5783 04-14-2013 05:18 PM
That's definitely too high Shady...

367 G/S = 48.545lbs/min

485.45bhp? I don't think so!

LOL

Brettus 04-14-2013 05:34 PM
Originally Posted by kma5783 (Post 4457131)
Yes you can calculate estimated horsepower based on Air Flow...

General rule of thumb is MFR(Mass Flow Rate)(Converted to lbs/min) x 10

The Actual Calculation is (MFR)(60)/(AFR)(BSFC(Brake Specific Fuel Consumption))

So...
270 G/S converted to 35.714lbs/min
35.714 x 10= 357.14bhp
That might be the calc for a piston engine . 270 g/s on a renesis works out around 270bhp or 230whp

kma5783 04-14-2013 05:40 PM
Originally Posted by Brettus (Post 4457141)
That might be the calc for a piston engine . 270 g/s on a renesis works out around 270bhp or 230whp
:dunno: That first calculation is a crude estimate. If we had the BSFC of the Renesis it would make it much more accurate.

Either way doesn't really matter to me, I'm not chasing numbers.

I like the way the car feels now, at 8-10psi I'll be more than happy.
Just going to put it on a dyno for the hell of it.

yomomspimp06 04-14-2013 05:50 PM
Originally Posted by kma5783 (Post 4457105)
My MAF Scale is good, that's the first thing we did...
Just wanted to point out the importance of having things scaled correctly. Keep it up Kyle

shadycrew31 04-14-2013 06:44 PM
1 Attachment(s)
Heres my datalog, it got messed up after I saved it. This was on the previous tune :/.

Brettus 04-14-2013 06:51 PM
Originally Posted by kma5783 (Post 4457146)
, I'm not chasing numbers.
t.
That's what they all say :p:

kma5783 04-14-2013 08:14 PM
Originally Posted by shadycrew31 (Post 4457169)
Heres my datalog, it got messed up after I saved it. This was on the previous tune :/.
Why no Calc Load, G/S, or Throttle?

Originally Posted by Brettus (Post 4457172)
That's what they all say :p:
LOL :yelrotflm

shadycrew31 04-14-2013 08:38 PM
Originally Posted by kma5783 (Post 4457190)
Why no Calc Load, G/S, or Throttle?



LOL :yelrotflm
Its on page 3!

kma5783 04-14-2013 09:09 PM
Originally Posted by shadycrew31 (Post 4457200)
Its on page 3!
:doh: Who the hell saves a log as a PDF anyway.


Also question for you guys, even when in Open Loop, what would cause the ECU to still show an LTFT? STFT is -0.16 which should indicate OL.

Brettus 04-14-2013 09:26 PM
Originally Posted by kma5783 (Post 4457213)
:doh: Who the hell saves a log as a PDF anyway.


Also question for you guys, even when in Open Loop, what would cause the ECU to still show an LTFT? STFT is -0.16 which should indicate OL.
That's how the ecu works and is why you maf calibration at cruise is so important .

shadycrew31 04-14-2013 09:35 PM
Originally Posted by kma5783 (Post 4457213)
:doh: Who the hell saves a log as a PDF anyway.


Also question for you guys, even when in Open Loop, what would cause the ECU to still show an LTFT? STFT is -0.16 which should indicate OL.
I couldnt put it on the forums as a CSV file or XLS :(.

kma5783 04-14-2013 09:37 PM
Originally Posted by Brettus (Post 4457222)
That's how the ecu works and is why you maf calibration at cruise is so important .
My fuel trims at cruise are good.

So if a LTFT is showing in Open Loop, that's fine?

kma5783 04-14-2013 09:38 PM
Originally Posted by shadycrew31 (Post 4457225)
I couldnt put it on the forums as a CSV file or XLS :(.
You can put it in a zip folder.

Brettus 04-14-2013 09:39 PM
Originally Posted by kma5783 (Post 4457227)
My fuel trims at cruise are good.

So if a LTFT is showing in Open Loop, that's fine?
you calibrate the maf to minimise your OL LTFT . Anything up to +- 3 is acceptable though.

Kane 04-14-2013 09:46 PM
I've never seen an Open Loop log with a LTFT, STFT and LTFT have always both gone to -0.16, so it was weirding me out.

If others have seen it, it will make me feel better.

Brettus 04-14-2013 09:48 PM
Originally Posted by Kane (Post 4457235)
I've never seen an Open Loop log with a LTFT, STFT and LTFT have always both gone to -0.16, so it was weirding me out.

If others have seen it, it will make me feel better.

I thought that was totally normal . To get zero LTFT your maf calibration has to be perfect. Maybe you are too perfect ? LOL

kma5783 04-14-2013 09:52 PM
Originally Posted by Brettus (Post 4457230)
you calibrate the maf to minimise your OL LTFT . Anything up to +- 3 is acceptable though.
It's at -0.94 so we are good there.

Originally Posted by Kane (Post 4457235)
I've never seen an Open Loop log with a LTFT, STFT and LTFT have always both gone to -0.16, so it was weirding me out.

If others have seen it, it will make me feel better.
I thought the same thing, that's why I figured I'd ask here to see what others had to say about it.

Kane 04-14-2013 09:56 PM
Maybe I'm too anal retentive....


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