SAFC Tuning ?'s
#1
T2 Noob.
Thread Starter
Join Date: Jun 2003
Location: San Fran-Mateo
Posts: 1,083
Likes: 0
Received 0 Likes
on
0 Posts
SAFC Tuning ?'s
Ok I went to the dyno meet today and managed to pull off 190 RWHP.
Here's my sheet:
I see that my AFR is around 11 after 4.5k RPMS. How much can I tune my SAFC to get a wee bit more power.
Thanks
Here's my sheet:
I see that my AFR is around 11 after 4.5k RPMS. How much can I tune my SAFC to get a wee bit more power.
Thanks
Last edited by fc3seeker; 06-05-04 at 08:23 PM.
#5
777** The Anti-rice
Join Date: Sep 2002
Location: Seattle, WA
Posts: 2,100
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by NZConvertible
Go back to the dyno and have it tuned properly. Don't guess.
Go back to the dyno and have it tuned properly. Don't guess.
was the first time he dyno'd it not propor?
can we get a bigger pic of the dyno? that one sucks.
If you need a host email it to me: Nicerx7@aol.com
#7
Exhaust leak
Join Date: Jan 2003
Location: Seattle, WA
Posts: 701
Likes: 0
Received 0 Likes
on
0 Posts
He has an '87 t2, according to his profile. Each tuning job for every car will be different, so it is ultimately up to you and if you cannot tune it properly, have a professional do it.
Trending Topics
#8
T2 Noob.
Thread Starter
Join Date: Jun 2003
Location: San Fran-Mateo
Posts: 1,083
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by DEZERTE
btw, do you have a t2 or an NA
Edit* and what mods?
btw, do you have a t2 or an NA
Edit* and what mods?
The pic I uploaded to imagestation was huge but when I linked it here it got shrunk.
I have an 87 T2 Mods:
RB Turboback
Walbro
FCD, BOV (<- if you wanna call those mods)
#9
SOLD THE RX-7!
Join Date: Mar 2001
Location: Vancouver, BC, Canada
Posts: 7,451
Likes: 0
Received 0 Likes
on
0 Posts
what was your boost? 190 seems kinda low.
as for tunning. you do a dyno run. adjust a bit. dyno run, adjust abit, dyno run etc....
you can't just do it once.
as for tunning. you do a dyno run. adjust a bit. dyno run, adjust abit, dyno run etc....
you can't just do it once.
#10
I'm a boost creep...
Join Date: Jan 2002
Location: Auckland, New Zealand
Posts: 15,608
Likes: 0
Received 8 Likes
on
8 Posts
Originally posted by DEZERTE
was the first time he dyno'd it not propor?
was the first time he dyno'd it not propor?
Last edited by NZConvertible; 06-05-04 at 11:09 PM.
#11
T2 Noob.
Thread Starter
Join Date: Jun 2003
Location: San Fran-Mateo
Posts: 1,083
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by Scott 89t2
what was your boost? 190 seems kinda low.
as for tunning. you do a dyno run. adjust a bit. dyno run, adjust abit, dyno run etc....
you can't just do it once.
what was your boost? 190 seems kinda low.
as for tunning. you do a dyno run. adjust a bit. dyno run, adjust abit, dyno run etc....
you can't just do it once.
Last edited by fc3seeker; 06-05-04 at 11:14 PM.
#12
I R SAD PANDA W/O BAW
If you uploaded the original large picture go to your imagestation and click on view original and it will show you the full size picture and you can load it here.
#13
777** The Anti-rice
Join Date: Sep 2002
Location: Seattle, WA
Posts: 2,100
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by NZConvertible
I didn't say it wasn't, I said he should go back to the dyno and have the S-AFC tuned properly instead of asking us to guess what correction figures might give him the AFR he wants. That's a good way to lose an engine...
I didn't say it wasn't, I said he should go back to the dyno and have the S-AFC tuned properly instead of asking us to guess what correction figures might give him the AFR he wants. That's a good way to lose an engine...
Anyways, here's his dynosheet:
#15
Rotary Enthusiast
Join Date: Dec 2002
Location: Darwin, NT, Australia
Posts: 1,228
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by DEZERTE
Oh ok, thanks. I dont get how to tune the AFC quite yet either. like the +/-%, say you are running 11:1 at 3500rpms.. what would tuning it -50% give you for an AFR?
Oh ok, thanks. I dont get how to tune the AFC quite yet either. like the +/-%, say you are running 11:1 at 3500rpms.. what would tuning it -50% give you for an AFR?
Really like NZConvertible said, you can't just guess and plug in numbers, some engines will respond slightly different to how much fuel you inject.
So don't try and tune a SAFC by doing one dyno run and trying to extrapolate AFR adjustment numbers from that to plug into your SAFC. Do it while your at the dyno.
#17
i am legendary
Join Date: Sep 2003
Location: Kirkland, WA
Posts: 8,478
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by DEZERTE
you can tune to 12 i believe if you have an NA. Ive heard of some going as lean as 12.5ish, but I would stay at 12.
you can tune to 12 i believe if you have an NA. Ive heard of some going as lean as 12.5ish, but I would stay at 12.
I've heard of people going to 13 no problem on n/a... 12 is alright, but you can go leaner and see greater gains
Last edited by ddub; 06-06-04 at 05:16 PM.
#18
Rotary Enthusiast
Join Date: Sep 2002
Location: Statesboro, GA
Posts: 1,233
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by jhillyer
The beast appears to be suffocated above 5krpm.
The beast appears to be suffocated above 5krpm.
#19
There is no suffocation above 5000 rpm. The
dyno chart appears to be perfectly normal.
Peak torque will be made at 5250rpm, and stock
intake or any intake kit wouldn't move that by
much.
Horsepower dropping after 6200 rpm indicating
this engine sports a stock porting or close to stock
port configuration. It seems that you can move
everything from 6000 rpm up half a point. That
might give you a little more power and move the
peak hp up a few hundred rpm. However, since
you have very limited control over your timing it is
not advisable to lean out too much more.
dyno chart appears to be perfectly normal.
Peak torque will be made at 5250rpm, and stock
intake or any intake kit wouldn't move that by
much.
Horsepower dropping after 6200 rpm indicating
this engine sports a stock porting or close to stock
port configuration. It seems that you can move
everything from 6000 rpm up half a point. That
might give you a little more power and move the
peak hp up a few hundred rpm. However, since
you have very limited control over your timing it is
not advisable to lean out too much more.
#20
777** The Anti-rice
Join Date: Sep 2002
Location: Seattle, WA
Posts: 2,100
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by White_FC
22:1, point being though that the engine would not be running at the same RPM because it wouldn't be able to make enough power to turn itself over. So the AFR would change again..
Really like NZConvertible said, you can't just guess and plug in numbers, some engines will respond slightly different to how much fuel you inject.
So don't try and tune a SAFC by doing one dyno run and trying to extrapolate AFR adjustment numbers from that to plug into your SAFC. Do it while your at the dyno.
22:1, point being though that the engine would not be running at the same RPM because it wouldn't be able to make enough power to turn itself over. So the AFR would change again..
Really like NZConvertible said, you can't just guess and plug in numbers, some engines will respond slightly different to how much fuel you inject.
So don't try and tune a SAFC by doing one dyno run and trying to extrapolate AFR adjustment numbers from that to plug into your SAFC. Do it while your at the dyno.
#21
Rotary Enthusiast
Join Date: Dec 2002
Location: Darwin, NT, Australia
Posts: 1,228
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by DEZERTE
I dont see why tuning -50% off of 11:1 would give you 22:1, seems like it woudl give you 16.5:1, while tuning -100% (which isnt possible) would give you 22:1... explain to me?
I dont see why tuning -50% off of 11:1 would give you 22:1, seems like it woudl give you 16.5:1, while tuning -100% (which isnt possible) would give you 22:1... explain to me?
This is of course keeping in mind that the actual air flow stays constant...
Which of course it doesn't like I said above.
Maybe you could explain to me how you worked yours out? You might be right... I don't know much when it comes to things like this, i'm only a mere student
#22
An interesting correlation I've found on a few stock dynographs is the hump between 4k and 4.5k rpms. This is obviously after the secondaries are firing, so there should be plenty of fuel to support the incoming airflow. Has anyone else noticed this tiny lean hump on bolt-on fc's?
#23
I'm a boost creep...
Join Date: Jan 2002
Location: Auckland, New Zealand
Posts: 15,608
Likes: 0
Received 8 Likes
on
8 Posts
Originally posted by DEZERTE
I dont see why tuning -50% off of 11:1 would give you 22:1, seems like it woudl give you 16.5:1, while tuning -100% (which isnt possible) would give you 22:1... explain to me?
I dont see why tuning -50% off of 11:1 would give you 22:1, seems like it woudl give you 16.5:1, while tuning -100% (which isnt possible) would give you 22:1... explain to me?
FYI, if you set the S-AFC to +50%, an 11:1 AFR would in theory change to 7.3:1, but I doubt the engine would even run...
Thread
Thread Starter
Forum
Replies
Last Post
demetlaw
3rd Generation Specific (1993-2002)
6
10-02-15 06:22 PM