Subject	Agreed 100%. I think I have determined his problem >>>
Posted by	Ash's Z on November 22, 2004 at 5:01 PM
	This message has been viewed 149 times.
In Reply To	in light of recent post/replies, i'd recommend that you posted by ni[X]it on November 22, 2004 at 01:42 PM
Message	As I recall, Chris has a dual electric fan setup on his car. Everytime the fans would kick on, the engine idle dropped and occasionally wanted to stumble. These fans are on a fused circuit with a thermocouple controller with a 20A fuse. It blew that fuse 3 times while on the dyno. One thing to also keep in mind is that at WOT, the ECU disengages the alternator's charging circuit. What I believe is going on is that these electric fans are running and pulling significant amounts of power from the rest of the car (i.e. fuel pump) and causing the system to run lean. This would also account for the car wanting to buck and surge while going down the track as those runs are quite a bit longer than a dyno-pull. The fuel pump likely isn't getting the power it needs. I have recommended to Chris to remove the electric fans and install the mechanical fan back on the car and then see how it performs. My money is on this as the issue. It will likely require re-tuning once the electric fans have been removed. I will be making an addendum to my Dyno dissertation post which will point out the fact about the alternator not providing charge to the battery while at WOT will give you lots of problems if you have a weak battery or excessive electrical loads within the vehicle. My #1 rule for the day: Got electric fans? KICK THEM TO THE CURB. [ ashspecz.com ] [ agpowers@bellsouth.net ] Enthusiasts soon understand each other. --W. Irving. Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor. Albert Einstein
Follow Ups	New best 1/4 mile time for me and a recent dyno tune - aZiator 07:27:59 11/22/04 at least you're in the 11's - snack_machine 07:39:18 11/22/04 ROFL at the last pic. >> - Arnel@Z32racing.com 08:09:07 11/22/04 Please don't cut the x-axis on dyno charts - Technomancer 08:17:03 11/22/04 Sorry, I dont have a scanner. Best I could do taking - aZiator 09:15:57 11/22/04 You could have them send you the dyno files - EricTTZ 10:18:19 11/22/04 When you talk about the plug porcelain, what do you mean - RSR 08:52:24 11/22/04 Look at the pic of the plug, whatever that part is around - aZiator 09:15:07 11/22/04 I looked at the picture, but can't tell much. - RSR 10:01:06 11/22/04 Ryan, look where I circled - boileralum 10:09:59 11/22/04 Thanks. It looks like....... - RSR 11:35:05 11/22/04 It is a good point. I had a chance to look at the pictures - Ash's Z 10:52:24 11/22/04 Actually----> - Kyle(Houston) 09:07:32 11/22/04 I forgot you even said that, I was actually talking about - aZiator 09:11:11 11/22/04 You did loose 60 Ft/lbs of torque & A/F is not as smooth.... (n/m) - Kyle(Houston) 09:21:59 11/22/04 Z1's dyno. I can swear it always read lower than the 248X - Ash's Z 09:32:17 11/22/04 Isn't Rwhp calculated from Torque X RPM/5252??----> - Kyle(Houston) 09:45:24 11/22/04 No, other way around. A dyno only determines horsepower - Ash's Z 10:38:54 11/22/04 That is the problem with Inertia dynos's----> - Kyle(Houston) 11:28:45 11/22/04 No kidding... - Dallas DamonZ 21:20:37 11/22/04 A brake dyno directly determines torque, and calculates - Ash's Z 11:09:26 11/22/04 3rd, A/F should have been worked on before going for a # - nixit 10:28:06 11/22/04 It happened the other way around though. We hit the number - Ash's Z 10:43:15 11/22/04 he ran out of fuel with 740's due to the fuel pump? - genic 10:49:26 11/22/04 A good fuel pump, probably so. But I think there are fuel - Ash's Z 10:54:05 11/22/04 im not worried about the rwhp numbers...just the - genic 10:55:58 11/22/04 I really think there is an issue with his fuel pump or some - Ash's Z 11:17:15 11/22/04 So what d oyou recomend? - EricTTZ 11:37:44 11/22/04 I'm researching that myself actually. I dont really have - Ash's Z 11:43:22 11/22/04 did you get your motor running yet? (n/m) - aliaZ 11:58:02 11/22/04 SPLParts seems to advocate overdriving the fuel pump - Technomancer 12:24:39 11/22/04 Overdriving an already weak pump won't help much though (n/m) - boileralum 12:35:26 11/22/04 Wasn't trying to apply this solution to that particular case - Technomancer 13:06:59 11/22/04 Dunno - I'm bored so I'm just trying to make conversation ;) (n/m) - boileralum 13:19:00 11/22/04 you jerks make my screen have a horizontal scrollbar now ;) (n/m) - joel(PA) 16:08:10 11/22/04 smaller fonts and higher resolution owns you :) (n/m) - Jjzx (next-gear.com) 17:34:07 11/22/04 Re: New best 1/4 mile time for me and a recent dyno tune - DrDCanaceu 09:27:45 11/22/04 LOL...Sigo esperando los 10s. :P - TheTwinZ (Peru) 12:29:28 11/22/04 Congrats on the time sir. (n/m) - Milo (Sport Z Magazine) 09:34:42 11/22/04 So which is funner, the Chinook or the Z? - Ash's Z 09:41:09 11/22/04 What plugs are you using? That looks like platinum - AzHeat 10:05:40 11/22/04 Curious: what is the relationship between the removal - RSR 10:08:56 11/22/04 shorter plug , the boss would not expose the spark as well - AzHeat 10:16:39 11/22/04 Copper Iridiums do work well w heat range of #7 >600rwhp - jawz 10:26:33 11/22/04 Copper Iridiums? :confused: (n/m) - boileralum 10:33:29 11/22/04 I think he mean copper or iridiums not both . (n/m) - AzHeat 10:34:30 11/22/04 removing the spark plug boss allows the use of shorter plugs (n/m) - aliaZ 10:51:58 11/22/04 in light of recent post/replies, i'd recommend that you - ni[X]it 13:42:10 11/22/04 Agreed 100%. I think I have determined his problem >>> - Ash's Z 17:01:19 11/22/04 Would my fuel pressure gauge show a drop in pressure if the - aZiator 17:30:55 11/22/04 Is this documented somewhere that the ecu disengages the - AzHeat 17:36:03 11/22/04
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