245 Hp at the Wheels!
Re: 245 Hp at the Wheels!
B/C he either/both did not reset the ECU after install (although I do not think it will change after you do - but it might) or/and is running a stock ECU on the plenum. Remember the plenum is downstream of the MAF, and SOMEHOW the greater amount of air that is being used by the front two cylinders is not being metered accordingly by the MAF/ECU. Thus, not enough fuel is being added to the mixture > LEAN condition. Whatever you may think the reason is, it is fact that the mixture gets LEANER after the plenum install, I and some others have confirmed it with wideband o2 measurements.
Mine went from 12.8-13 to 13.7-14.0 after the plenum install, however granted that I did not allow for the learning of the new airflow to occur by the ECU - for all I know the mixtured might have normalized a bit a while later - jsut don;t think they would be ideal.
Gurgen
<P ID="edit"><FONT class="small"><EM>Edited by gurgenpb on 05/13/04 05:28 PM.</EM></FONT></P>
Mine went from 12.8-13 to 13.7-14.0 after the plenum install, however granted that I did not allow for the learning of the new airflow to occur by the ECU - for all I know the mixtured might have normalized a bit a while later - jsut don;t think they would be ideal.
Gurgen
<P ID="edit"><FONT class="small"><EM>Edited by gurgenpb on 05/13/04 05:28 PM.</EM></FONT></P>
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Re: 245 Hp at the Wheels!
Sorry...been away for a while. Attached is the raw A/F data. It's not running quite as lean as you thought. The plot is somewhat misleading. The A/F numbers do not line up with the major gridlines. I tried both ECU reset methods and had no apparent change. I'll attach a plot in my next post.
I will take your recommendation though and send the A/F data to Doug and get his opinion on a reflash.
I'm not going back to the dyno unless I reflash...at $150 a pop it's not cheap.
G35s 6MT Garnet Fire, Premium, Aero, Aero Body Kit, Winter Sport
255475-Table.jpg
I will take your recommendation though and send the A/F data to Doug and get his opinion on a reflash.
I'm not going back to the dyno unless I reflash...at $150 a pop it's not cheap.
G35s 6MT Garnet Fire, Premium, Aero, Aero Body Kit, Winter Sport
255475-Table.jpg
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Re: 245 Hp at the Wheels!
Attached are 2 back to back post mod runs where I did the easy ECU reset. My conclusion from this data was the ECU reset does absolutely nothing. But that was going to be a topic for another post.
G35s 6MT Garnet Fire, Premium, Aero, Aero Body Kit, Winter Sport
255476-winpep3.jpg
G35s 6MT Garnet Fire, Premium, Aero, Aero Body Kit, Winter Sport
255476-winpep3.jpg
Re: 245 Hp at the Wheels!
smccallis
the easy ECU reset does NOT do what we previosly thought , you need to clamp the two battery terminals together for at least 5 secs. That really DID do somethign for my car. Also, looking at your raw numbers - I was NOT misled earlier. 14.0-14.3 is VERY high for 5000 rpm. You should be runnign 13.4 MAX at that level. Trust me!
Also, as I saif earlier it is teh VERY erratic nature of the A/F plot taht worries me also, not just the numbers.
Wow you pay 150 /dyno - that is robbery. I pay $65-80 out here.
Gurgen
the easy ECU reset does NOT do what we previosly thought , you need to clamp the two battery terminals together for at least 5 secs. That really DID do somethign for my car. Also, looking at your raw numbers - I was NOT misled earlier. 14.0-14.3 is VERY high for 5000 rpm. You should be runnign 13.4 MAX at that level. Trust me!
Also, as I saif earlier it is teh VERY erratic nature of the A/F plot taht worries me also, not just the numbers.
Wow you pay 150 /dyno - that is robbery. I pay $65-80 out here.
Gurgen
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From: San Diego, CA
Re: 245 Hp at the Wheels!
I think it important to point out to those that don't pay attention to detail.. clamp together the two battery terminals.. that would be the two cables on the car, while they are disconnected from the battery.. do not connect the two posts on the battery together. [img]/w3timages/icons/tongue.gif[/img]
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Re: 245 Hp at the Wheels!
gurgenpb, thanks for the advice. I will look into it. I did the battery terminal thing yesterday before I posted. Obviously I have no A/F data for that but it didn't feel any different after...
Also I ran the car 2 weeks post mod before that dyno data. I would hope that our beloved adaptive ECU would have learned and settled out by then.
The dyno shop has the advantage of being the only one in at least a 100 mi radius. So they get what they get. They have given me a break for doing multiple setups at 110 but it still aint cheap. Once you're strapped down they are pretty good about letting you fool around with stuff and do 3-5 runs. But for that price I suppose it's the least they can do.
G35s 6MT Garnet Fire, Premium, Aero, Aero Body Kit, Winter Sport
Also I ran the car 2 weeks post mod before that dyno data. I would hope that our beloved adaptive ECU would have learned and settled out by then.
The dyno shop has the advantage of being the only one in at least a 100 mi radius. So they get what they get. They have given me a break for doing multiple setups at 110 but it still aint cheap. Once you're strapped down they are pretty good about letting you fool around with stuff and do 3-5 runs. But for that price I suppose it's the least they can do.
G35s 6MT Garnet Fire, Premium, Aero, Aero Body Kit, Winter Sport
Re: 245 Hp at the Wheels!
Yes of course, ryoken, you are right. I should have made it clearer in my last post , although I did say disconnect the battery first earlier in the thread!
Gurgen
<P ID="edit"><FONT class="small"><EM>Edited by gurgenpb on 05/17/04 11:13 AM.</EM></FONT></P>
Gurgen
<P ID="edit"><FONT class="small"><EM>Edited by gurgenpb on 05/17/04 11:13 AM.</EM></FONT></P>
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