Subject	the burn is not as clean at idle & low-normal engine speeds
Posted by	SpecNATT (Houston) on June 19, 2006 at 1:08 AM
	This message has been viewed 132 times.
In Reply To	"you'll prob. see a drop in mpg w. the 740cc". Really? (n/m) posted by Z-Jay (Edmonton, AB) on June 19, 2006 at 12:06 AM
Message	because as yugo state the spary is less precise for low and normal engine speed opperating range. 740s INJ duty cycle is about 1.5 at idle compared to about 2.9-3.4 stock at idle. 740 pulse is a short burst 1.5 compared to 3ms doesnt seem like quite a diffence but its accually TWICE as long, giving a more consistant spary and time to mix with intake charge TT dynoed 340 rwhp 361rwtq before rebuild w/ SGP block/ GMS550BBs La-Z-Link.
Follow Ups	Two injector questions - Black95 23:51:02 06/18/06 Re: Two injector questions - Guapo 00:01:41 06/19/06 Answers. - YugoBernie (NoVA) 00:02:52 06/19/06 "you'll prob. see a drop in mpg w. the 740cc". Really? (n/m) - Z-Jay (Edmonton, AB) 00:06:17 06/19/06 Re: "you'll prob. see a drop in mpg w. the 740cc". Really? - ouikikazz 00:10:44 06/19/06 the burn is not as clean at idle & low-normal engine speeds - SpecNATT (Houston) 01:08:13 06/19/06 Do you have comparitive numbers for the 95+ 555cc (615cc) - Z-Jay (Edmonton, AB) 09:06:28 06/19/06 ya, somewhere (n/m) - SpecNATT (Houston) 23:01:37 06/19/06 interesting, i never knew that. . . . - itsmyz (SoCal-San Diego) 09:58:13 06/19/06 i dont know about cali emission - SpecNATT (Houston) 21:27:16 06/19/06 Re: Answers. - Black95 00:13:35 06/19/06 Sticker would say 555 if it had upgraded injectors. (n/m) - YugoBernie (NoVA) 00:18:55 06/19/06 Why would you see a drop in mpg? - Spee 00:22:45 06/19/06 Theoretically less precise flow control. (n/m) - YugoBernie (NoVA) 00:25:01 06/19/06 ding - aliaZ 00:41:36 06/19/06 well then that doesn't bode well for tuning does it? - Spee 00:51:22 06/19/06 You've got to err on the rich side, hence the reduced mpg. (n/m) - Kenny 00:53:34 06/19/06 let me clarify - aliaZ 06:54:21 06/19/06 I usually don't cruise down the road at WOT. (n/m) - Guapo 09:50:00 06/19/06 Weak. (n/m) - RSR 11:23:27 06/19/06 :finger: (n/m) - Guapo 11:24:50 06/19/06 dogpile and I got 20-21 mpg in my car on the way to ZCON and - boileralum 12:03:04 06/19/06 But we had no boost either :( - dogpile 12:09:24 06/19/06 battery gasses filling the cabin made the car lighter. - Spee 12:20:50 06/19/06 He's alive!!! (n/m) - Spongerider :) 16:57:15 06/19/06 Shrug: I got 22MPG going to TX and 24 coming back. - Ash's Z 08:24:27 06/19/06 What about emission testing with larger injectors? - Only1Z 21:34:24 06/19/06 I think that if the tune is good then 740's shouldn't be an - YugoBernie (NoVA) 14:16:59 06/20/06 I'll take this one.... - Ghozt 00:11:39 06/19/06
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