stef12rr
Expert Class
Posts: 144
|
posted May 25, 2007 01:22 PM
tunning mapping
What is the best way to tunned the bike
with the ox sensor in the ex and going by the mixure
or old way
  
|
thekaz
Needs a job
spell chequer is bustimicated
Posts: 2909
|
posted May 25, 2007 02:24 PM
I vote old way but i am old :P
|
supra5677
Pro
Posts: 1279
|
posted May 25, 2007 08:43 PM
oxygen sensor in the exhaust ,, period...
|
stef12rr
Expert Class
Posts: 144
|
posted June 03, 2007 02:28 AM
supra5677 do you know the best fuel ratio for a 1287cc
|
supra5677
Pro
Posts: 1279
|
posted June 03, 2007 11:19 AM
when tuning taking ram air into account I would go 12.9 to 1.. Especially in the higher rpm ranges...
|
dougmeyer
Needs a job
moderated
Posts: 2713
|
posted June 09, 2007 03:40 PM
 Edited By: dougmeyer on 9 Jun 2007 16:44
Supra,
How do you justify that statement? The system is designed to enrich as the pressure rises and / or ambient temp(density altitude at the TB) varies. Why would you bias the A/F to a specific number rather than best power at 0 mph at each rpm data point? What does rpm have to do with ram air correction?
10,000 rpm at 75 mph is certainly different than 10,000 rpm at 175......
|
supra5677
Pro
Posts: 1279
|
posted June 09, 2007 08:22 PM
If your using a dynojet dyno and software like Brock Davidson you have to guess.. After reading Brock's diary his bikes went faster at Maxton and on the Dragstrip with more fuel rather than less fuel. The specific bike I saw had 12.9 to 1 air/fuel on the dyno.
I agree with you that 10,000 rpm at 75 is different than 10,000 rpm at 175. However without an oxygen sensor in the collector reading air/fuel real time we are unfortunately limited to GUESSING... For Brock adding fuel on a guess worked better than the adjustment the ecu was doing itself...
|
psycho1122
Pro
Posts: 1608
|
posted June 10, 2007 06:16 AM
Supra;
I would lean towards the probability that Brock's map was a bit lean to begin with.
BTW, my 1270 w/ 14:1 CR runs 12.8 at peak VE.
____________
You say PSYCHO like it's a BAD thing!!
|
supra5677
Pro
Posts: 1279
|
posted June 11, 2007 07:30 AM
let me go back and look at the diary and post some a/f numbers..
|
supra5677
Pro
Posts: 1279
|
posted June 11, 2007 07:37 AM
Ok here is the data from Brock's diary..
Fastest bike: 189.10RWHP( on dyno) 12.91 to 1 air/fuel....9.09 sec at 154.85 mph
Slower bike: 195.31 RWHP (on dyno) 13.32 to 1 air/fuel...9.20at 152 mph
The bike with less horsepower on the dyno went faster on the track... according to Brock it takes 3hp to go 1 more mph in the quarter mile.. So add 6 hp for mph and another 6 hp lesson the dyno yields 12 more RWHP with the ram air.. Brock had similar results at Maxton...
supra
|
supra5677
Pro
Posts: 1279
|
posted June 11, 2007 07:39 AM
Psycho you are right.. Brock's map was too lean to begin with at least according to the data. His map made more horsepower on the dyno but went slower on the road...
|
dougmeyer
Needs a job
moderated
Posts: 2713
|
posted June 11, 2007 08:17 AM
But Supra, The ECU STILL added the fuel.
|
supra5677
Pro
Posts: 1279
|
posted June 11, 2007 08:27 AM
my point is, and from what I believe Brock was trying to explain was that yes the ecu added fuel, but not enough fuel. ( for best performance )So brock added more fuel than what the ecu would have added on its own via the powercommander..
Because the ecu reads charts( and no o2 sensor) it can't adjust by itself to changes in exhaust, air filters and timing. If it could we wouldn't be using powercommander, teka or whatever..
|
psycho1122
Pro
Posts: 1608
|
posted June 12, 2007 03:49 AM
supra; what DM is trying to get across here is that the ECU will look at both pressure sensors along with all other parameters and add or remove fuel accordingly.
(quote) Because the ecu reads charts( and no o2 sensor) it can't adjust by itself to changes in exhaust, air filters and timing......
This is what tuning with a PC is for. The PC will add or subtract to the signal from the ECU (which is constantly changing on the road). The base map produced on the dyno needs to be rich enough for the engine combo and the the ECU/PC will will run from there.
Also, the ECU is constantly changing during Dyno tuning. Just not for Ram. It knows it's sitting still. I would be careful to NOT ALLOW engine operating temperatures to exceed normal road temperatures. KHI builds in an Algorithem to over richen at high temps to to "cool" the combustion chambers. This can cause false lean maps.
____________
You say PSYCHO like it's a BAD thing!!
|
supra5677
Pro
Posts: 1279
|
posted June 12, 2007 07:59 AM
agreed..
|
dougmeyer
Needs a job
moderated
Posts: 2713
|
posted June 13, 2007 08:44 PM
Thanks, Psycho
|
VincentHill
Needs a life
Posts: 6520
|
posted June 14, 2007 11:50 AM
WOW!! DM is a hard man! I undersatood what Supra was saying for base information
____________
Made History @ Daytona and still one fast old man!!
|
supra5677
Pro
Posts: 1279
|
posted June 15, 2007 11:24 AM
bottom line the ECM the bikes come with are out dated and old school. This is why we are relagated to using powercommanders teka tune etc.. If the bike had a real computer like a car it would be more efficient. Many times I chose not to argue with DM because many times we are saying 2 sides of the same thing..
supra
|
|
|
HOME
NEW TOPIC