RX8Club.com

Notices
RX-8 Multimedia/Photo Gallery Share your pics,videos or links to them.

kma5783's Build Thread

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old 04-14-2013, 04:22 PM
  #326  
WENTGERMAN
iTrader: (6)
 
shadycrew31's Avatar
 
Join Date: Apr 2008
Location: Burbs,PA
Posts: 5,805
Received 30 Likes on 22 Posts
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.
shadycrew31 is offline  
Reply Like
Old 04-14-2013, 04:26 PM
  #327  
Registered
Thread Starter
iTrader: (7)
 
kma5783's Avatar
 
Join Date: Nov 2009
Location: Tampa, FL
Posts: 833
Likes: 0
Received 7 Likes on 6 Posts
Originally Posted by shadycrew31
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?
kma5783 is offline  
Reply Like
Old 04-14-2013, 04:39 PM
  #328  
WENTGERMAN
iTrader: (6)
 
shadycrew31's Avatar
 
Join Date: Apr 2008
Location: Burbs,PA
Posts: 5,805
Received 30 Likes on 22 Posts
Originally Posted by kma5783
In what gear?
third and my calc load was nearly maxed.
shadycrew31 is offline  
Reply Like
Old 04-14-2013, 04:41 PM
  #329  
Boosted Kiwi
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,523
Received 1,490 Likes on 839 Posts
Originally Posted by kma5783
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

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 .
Last edited by Brettus; 04-14-2013 at 05:06 PM.
Brettus is offline  
Reply Like
Old 04-14-2013, 04:47 PM
  #330  
Boosted Kiwi
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,523
Received 1,490 Likes on 839 Posts
Originally Posted by shadycrew31
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
Last edited by Brettus; 04-15-2013 at 12:09 AM.
Brettus is offline  
Reply Like
Old 04-14-2013, 05:08 PM
  #331  
WENTGERMAN
iTrader: (6)
 
shadycrew31's Avatar
 
Join Date: Apr 2008
Location: Burbs,PA
Posts: 5,805
Received 30 Likes on 22 Posts
Originally Posted by Brettus
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.
shadycrew31 is offline  
Reply Like
Old 04-14-2013, 05:15 PM
  #332  
Registered
Thread Starter
iTrader: (7)
 
kma5783's Avatar
 
Join Date: Nov 2009
Location: Tampa, FL
Posts: 833
Likes: 0
Received 7 Likes on 6 Posts
Originally Posted by Brettus
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 is offline  
Reply Like
Old 04-14-2013, 05:18 PM
  #333  
Registered
Thread Starter
iTrader: (7)
 
kma5783's Avatar
 
Join Date: Nov 2009
Location: Tampa, FL
Posts: 833
Likes: 0
Received 7 Likes on 6 Posts
That's definitely too high Shady...

367 G/S = 48.545lbs/min

485.45bhp? I don't think so!

LOL
kma5783 is offline  
Reply Like
Old 04-14-2013, 05:34 PM
  #334  
Boosted Kiwi
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,523
Received 1,490 Likes on 839 Posts
Originally Posted by kma5783
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
Brettus is offline  
Reply Like
Old 04-14-2013, 05:40 PM
  #335  
Registered
Thread Starter
iTrader: (7)
 
kma5783's Avatar
 
Join Date: Nov 2009
Location: Tampa, FL
Posts: 833
Likes: 0
Received 7 Likes on 6 Posts
Originally Posted by Brettus
That might be the calc for a piston engine . 270 g/s on a renesis works out around 270bhp or 230whp
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.
Last edited by kma5783; 04-14-2013 at 05:59 PM.
kma5783 is offline  
Reply Like
Old 04-14-2013, 05:50 PM
  #336  
El Jefe
 
yomomspimp06's Avatar
 
Join Date: Mar 2007
Posts: 1,833
Received 7 Likes on 7 Posts
Originally Posted by kma5783
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
yomomspimp06 is offline  
Reply Like
Old 04-14-2013, 06:44 PM
  #337  
WENTGERMAN
iTrader: (6)
 
shadycrew31's Avatar
 
Join Date: Apr 2008
Location: Burbs,PA
Posts: 5,805
Received 30 Likes on 22 Posts
Heres my datalog, it got messed up after I saved it. This was on the previous tune :/.
Attached Files
File Type: pdf
datalog 1.pdf (208.6 KB, 106 views)
shadycrew31 is offline  
Reply Like
Old 04-14-2013, 06:51 PM
  #338  
Boosted Kiwi
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,523
Received 1,490 Likes on 839 Posts
Originally Posted by kma5783
, I'm not chasing numbers.
t.
That's what they all say
Brettus is offline  
Reply Like
Old 04-14-2013, 08:14 PM
  #339  
Registered
Thread Starter
iTrader: (7)
 
kma5783's Avatar
 
Join Date: Nov 2009
Location: Tampa, FL
Posts: 833
Likes: 0
Received 7 Likes on 6 Posts
Originally Posted by shadycrew31
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
That's what they all say
LOL
kma5783 is offline  
Reply Like
Old 04-14-2013, 08:38 PM
  #340  
WENTGERMAN
iTrader: (6)
 
shadycrew31's Avatar
 
Join Date: Apr 2008
Location: Burbs,PA
Posts: 5,805
Received 30 Likes on 22 Posts
Originally Posted by kma5783
Why no Calc Load, G/S, or Throttle?



LOL
Its on page 3!
shadycrew31 is offline  
Reply Like
Old 04-14-2013, 09:09 PM
  #341  
Registered
Thread Starter
iTrader: (7)
 
kma5783's Avatar
 
Join Date: Nov 2009
Location: Tampa, FL
Posts: 833
Likes: 0
Received 7 Likes on 6 Posts
Originally Posted by shadycrew31
Its on page 3!
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.
kma5783 is offline  
Reply Like
Old 04-14-2013, 09:26 PM
  #342  
Boosted Kiwi
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,523
Received 1,490 Likes on 839 Posts
Originally Posted by kma5783
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 .
Brettus is offline  
Reply Like
Old 04-14-2013, 09:35 PM
  #343  
WENTGERMAN
iTrader: (6)
 
shadycrew31's Avatar
 
Join Date: Apr 2008
Location: Burbs,PA
Posts: 5,805
Received 30 Likes on 22 Posts
Originally Posted by kma5783
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 .
shadycrew31 is offline  
Reply Like
Old 04-14-2013, 09:37 PM
  #344  
Registered
Thread Starter
iTrader: (7)
 
kma5783's Avatar
 
Join Date: Nov 2009
Location: Tampa, FL
Posts: 833
Likes: 0
Received 7 Likes on 6 Posts
Originally Posted by Brettus
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 is offline  
Reply Like
Old 04-14-2013, 09:38 PM
  #345  
Registered
Thread Starter
iTrader: (7)
 
kma5783's Avatar
 
Join Date: Nov 2009
Location: Tampa, FL
Posts: 833
Likes: 0
Received 7 Likes on 6 Posts
Originally Posted by shadycrew31
I couldnt put it on the forums as a CSV file or XLS .
You can put it in a zip folder.
kma5783 is offline  
Reply Like
Old 04-14-2013, 09:39 PM
  #346  
Boosted Kiwi
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,523
Received 1,490 Likes on 839 Posts
Originally Posted by kma5783
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.
Brettus is offline  
Reply Like
Old 04-14-2013, 09:46 PM
  #347  
Illudium Q-36 Space Moderator
iTrader: (1)
 
Kane's Avatar
 
Join Date: Jan 2007
Location: PCB
Posts: 6,364
Received 41 Likes on 31 Posts
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.
Kane is offline  
Reply Like
Old 04-14-2013, 09:48 PM
  #348  
Boosted Kiwi
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 20,523
Received 1,490 Likes on 839 Posts
Originally Posted by Kane
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
Brettus is offline  
Reply Like
Old 04-14-2013, 09:52 PM
  #349  
Registered
Thread Starter
iTrader: (7)
 
kma5783's Avatar
 
Join Date: Nov 2009
Location: Tampa, FL
Posts: 833
Likes: 0
Received 7 Likes on 6 Posts
Originally Posted by Brettus
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
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.
kma5783 is offline  
Reply Like
Old 04-14-2013, 09:56 PM
  #350  
Illudium Q-36 Space Moderator
iTrader: (1)
 
Kane's Avatar
 
Join Date: Jan 2007
Location: PCB
Posts: 6,364
Received 41 Likes on 31 Posts
Maybe I'm too **** retentive....
Kane is offline  
Reply Like


You have already rated this thread Rating: Thread Rating: 0 votes, average.
Show Printable Version
Email this Page

Advanced Search
Quick Reply: kma5783's Build Thread


Reply Closed Thread Share

All times are GMT -5. The time now is 10:29 AM.