Subject	Anyone know the hp difference, if any, if you bump up
Posted by	eriksu9 on June 10, 2009 at 7:39 AM
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Message	555 cc to 740 cc injectors? I am going to make the switch in light of the ever ongoing 555 injector failure and was just curious if the upgrade is noteworthy. I know more air/more fuel= more power but I have not seen anyone or any posts with someone just upgrading the injectors and how substantial the hp increase is, if any. I do realize the change in the chip which I imagine would be the biggest hp diff. when upgrading the injectors. Any info would be appreciated. http://www.members.aol.com/eriksu9/images/1badz.jpg" BORDER=0>Sold: 1986 Yamaha FJ1100 1987 Nissan 300zx na(Z31) 1979 280ZX 2+2 1972 MGB 1968 Pontiac Firebird 1972 Nissan 240Z, dual webber carbs, etc
Follow Ups	Anyone know the hp difference, if any, if you bump up - eriksu9 07:39:37 06/10/09 0 - na300zx (OH) 07:50:16 06/10/09 probably less as you will probably be running fat! - Carlos Ramirez 07:57:58 06/10/09 I would be replacing stock injectors, can I.... - whitepearl 08:07:56 06/10/09 Your turbos max out well before those injectors will. - Z_Cherub 08:15:58 06/10/09 I run 740s - Drk93TT 09:05:00 06/10/09 What octane do you run 17 psi on? (n/m) - MixManMash 11:03:48 06/10/09 93 octane (n/m) - Drk93TT 11:09:05 06/10/09 That seems a bit much on that octane. Especially without - MixManMash 15:53:47 06/10/09 Do you ever wonder if having a duty cycle that low effects - ZEVAN (Ca) 11:04:13 06/10/09 Nah (n/m) - Drk93TT 11:09:58 06/10/09 stock turbo's w/ 370cc injectors @15psi = ~100% duty cycle (n/m) - SuparexTT 09:10:22 06/10/09 So with larger injectors you may be able to go slightly - Z_Cherub 09:26:28 06/10/09 Correct - Drk93TT 09:33:53 06/10/09 "From what I understand anything over 15psi is not efficient - Z_Cherub 09:37:54 06/10/09 Yeah, thats why I got the 740s - Drk93TT 09:47:41 06/10/09 Yep. And you have plenty of room in the fuel delivery dept - Z_Cherub 09:55:47 06/10/09 precisely (n/m) - Drk93TT 11:11:12 06/10/09 You will still never need 740 injectors - ubermiach 10:06:44 06/10/09 "more air/more fuel= more power" - kenecchi 09:19:58 06/10/09 Check out my mod list. - eriksu9 12:12:06 06/10/09 That'd be sweet, do it. :D - kenecchi 12:24:14 06/10/09 I think you'd need 3 SAFC's, two feeding into one. lol. (n/m) - MixManMash 15:52:16 06/10/09
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