F'ing Great! Trip to the dyno-->not good news

kcast · 02-08-2006, 06:34 PM

Well, glad I went to the dyno
Mods are in the sig, it was tuned before last did 507/497, since then the previous owner added a catted x-pipe and I added a 100 mm aux idler to help with the belt slip. the dyno jet said my airfuel was 16.8!AHHHH. In the low RPM's it starts at about 15.2 then drops to 13.0 then up to about 16 where it ends up at about 16.8 and the line looks like it was sketched by a three year old!!! I was just wanting to share this info with you all b/c apparently a catted x and an aux idler does make a big difference!!! Oh and it only put down 467/397! Its not the dyno either b/c my buddies whipple cobra put down 530/515 with his street tune (he said it should be close).... I am thinking the damn fuel pump went out!!! I hope not! What do you think??

**Pro-Dyno** · 02-09-2006, 07:53 AM

Very posible the only way to tell for sure is log fuel presure drop at the rail and see if it dropes below 35psi when you get in it

NC03BlkSnake · 02-09-2006, 09:51 AM

MAF? I wouldn't think the fuel pump would cause that, if it goes, it's gone.

**Pro-Dyno** · 02-09-2006, 09:06 PM

Possibly if it is really oily but it has bean my experience that if one pump goes out this condition will happen

kcast · 02-10-2006, 12:46 AM

Quote:

Originally Posted by Pro-Dyno

Possibly if it is really oily but it has bean my experience that if one pump goes out this condition will happen

I think that I'm gonna get an xcal 2 and a WBC and do some datalogging to see whats going on, then get it retuned....

Skitzerman · 02-12-2006, 01:22 PM

Check your batteries voltage as you work up the RPM's. If it is dropping down into the 12 volt range, your alternator may have s**t the bed or the battery is going south. You may see a corresponding drop in voltage with those bad a/f readings. Underdrive pulleys don't help the situation. If you add a bigger lower pulley, make sure your alternator under drive brings you back as close to spec as possible.

Linn@Amazon · 02-14-2006, 04:22 PM

Quote:

Originally Posted by kcast

I think that I'm gonna get an xcal 2 and a WBC and do some datalogging to see whats going on, then get it retuned....

that is a good plan of action...data will tell the story...

kcast · 03-04-2006, 03:07 PM

Well guys, as you remember from the post above, I got my DJWBC and started on the install. I removed the ecu from the kick panel and heard something jumbling around in it!!! Well guess what?! IT WAS MY CHIP! No damage caused, just plugged it back in and made sure there was enough tape on it this time. I havent finished the install yet, need to get the bung welded and then it'll be time to see what the AFR is! I really hope this was my problem, running the ported eaton w/ a 2.80 pulley on the stock tune, that would sure enough give a lean condition. I'll keep you updated!

Linn@Amazon · 03-04-2006, 03:56 PM

yes it surely would

Texaslawdawg · 03-06-2006, 02:42 PM

yikes! 16.8 is a timebomb...

kcast · 03-07-2006, 03:47 AM

got the wideband installed today and it WAS the chip, everything is ok, AFR 11.2-11.8ish ready to go back to the dyno!

02-08-2006, 06:34 PM	#1
kcast Registered User Join Date: Jan 2006 Location: MB, SC Posts: 16	F'ing Great! Trip to the dyno-->not good news Well, glad I went to the dyno Mods are in the sig, it was tuned before last did 507/497, since then the previous owner added a catted x-pipe and I added a 100 mm aux idler to help with the belt slip. the dyno jet said my airfuel was 16.8!AHHHH. In the low RPM's it starts at about 15.2 then drops to 13.0 then up to about 16 where it ends up at about 16.8 and the line looks like it was sketched by a three year old!!! I was just wanting to share this info with you all b/c apparently a catted x and an aux idler does make a big difference!!! Oh and it only put down 467/397! Its not the dyno either b/c my buddies whipple cobra put down 530/515 with his street tune (he said it should be close).... I am thinking the damn fuel pump went out!!! I hope not! What do you think?? __________________ 2004 *Redfire* COBRA!#917 of 3,768 <--total cobras. Only 509 redfire produced Mods Borla Stinger Catback UPR Catted X-pipe Steigy Blower/TB/Plenum Port SFPHQ 2.80 Upper LFP 100mm aux idler UPR Short throw Steeda CAI Spec III clutch (i think) Lowered (dont know what springs) 507rwhp 497rwtq <--old numbers w/alot of belt slip Is it fast? HELL YEAH! R.I.P. 2003 Torch Red Cammin' GT

02-09-2006, 07:53 AM	#2
Pro-Dyno Super Moderator Join Date: Dec 2004 Location: Fort Mill, SC Posts: 696	Very posible the only way to tell for sure is log fuel presure drop at the rail and see if it dropes below 35psi when you get in it __________________

02-09-2006, 09:51 AM	#3
NC03BlkSnake Registered User Join Date: Sep 2005 Posts: 47	MAF? I wouldn't think the fuel pump would cause that, if it goes, it's gone. __________________ 03 Black Cobra Coupe Mods: Billetflow 2.76 w/4 idler setup PFab Intercooler Resevoir Amazon Racing CAI VRS O/R X-pipe Mac DuraBlack Coated Cat-Back SCT Chip/Tuned by Pro-Dyno 475-RWHP/507-RWTQ

02-09-2006, 09:06 PM	#4
Pro-Dyno Super Moderator Join Date: Dec 2004 Location: Fort Mill, SC Posts: 696	Possibly if it is really oily but it has bean my experience that if one pump goes out this condition will happen __________________

02-12-2006, 01:22 PM	#6
Skitzerman Registered User Join Date: Jan 2006 Location: Philadelphia PA. Posts: 30	F8LBYTE in Philly Check your batteries voltage as you work up the RPM's. If it is dropping down into the 12 volt range, your alternator may have s**t the bed or the battery is going south. You may see a corresponding drop in voltage with those bad a/f readings. Underdrive pulleys don't help the situation. If you add a bigger lower pulley, make sure your alternator under drive brings you back as close to spec as possible.

03-04-2006, 03:07 PM	#8
kcast Registered User Join Date: Jan 2006 Location: MB, SC Posts: 16	!update! Well guys, as you remember from the post above, I got my DJWBC and started on the install. I removed the ecu from the kick panel and heard something jumbling around in it!!! Well guess what?! IT WAS MY CHIP! No damage caused, just plugged it back in and made sure there was enough tape on it this time. I havent finished the install yet, need to get the bung welded and then it'll be time to see what the AFR is! I really hope this was my problem, running the ported eaton w/ a 2.80 pulley on the stock tune, that would sure enough give a lean condition. I'll keep you updated! __________________ 2004 *Redfire* COBRA!#917 of 3,768 <--total cobras. Only 509 redfire produced Mods Borla Stinger Catback UPR Catted X-pipe Steigy Blower/TB/Plenum Port SFPHQ 2.80 Upper LFP 100mm aux idler UPR Short throw Steeda CAI Spec III clutch (i think) Lowered (dont know what springs) 507rwhp 497rwtq <--old numbers w/alot of belt slip Is it fast? HELL YEAH! R.I.P. 2003 Torch Red Cammin' GT

03-04-2006, 03:56 PM	#9
Linn@Amazon Registered User Join Date: Jun 2005 Posts: 198	yes it surely would

03-06-2006, 02:42 PM	#10
Texaslawdawg Registered User Join Date: Feb 2006 Location: Midland,TX Posts: 11	yikes! 16.8 is a timebomb...

03-07-2006, 03:47 AM	#11
kcast Registered User Join Date: Jan 2006 Location: MB, SC Posts: 16	got the wideband installed today and it WAS the chip, everything is ok, AFR 11.2-11.8ish ready to go back to the dyno! __________________ 2004 *Redfire* COBRA!#917 of 3,768 <--total cobras. Only 509 redfire produced Mods Borla Stinger Catback UPR Catted X-pipe Steigy Blower/TB/Plenum Port SFPHQ 2.80 Upper LFP 100mm aux idler UPR Short throw Steeda CAI Spec III clutch (i think) Lowered (dont know what springs) 507rwhp 497rwtq <--old numbers w/alot of belt slip Is it fast? HELL YEAH! R.I.P. 2003 Torch Red Cammin' GT

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