# 550cc VS 700cc **URL:** \ **Category:** SON240sx Automotive\ **Created:** [January 28, 2007, 7:53pm UTC](https://forums.speedlife.net/t/550cc-vs-700cc/103365 "2007-01-28T19:53:54Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![drew17](https://avatars.discourse-cdn.com/v4/letter/d/c4cdca/32.png) [@drew17](https://forums.speedlife.net/u/drew17)\ **Post date:** [January 28, 2007, 7:53pm UTC](https://forums.speedlife.net/t/550cc-vs-700cc/103365/1 "2007-01-28T19:53:54Z")
hey just wondering what you guys think about and have had expierences with your injectors. im trying to figure out if i want to go with 550’s or 700’s. i would like to know waht boost your injectors have peaked out at and how hard it was to tune with the bigger injectors etc. any info is helpful. thanks. ---
**Author:** ![EviltoM](https://avatars.discourse-cdn.com/v4/letter/e/97f17d/32.png) [@EviltoM](https://forums.speedlife.net/u/EviltoM)\ **Post date:** [January 28, 2007, 10:57pm UTC](https://forums.speedlife.net/t/550cc-vs-700cc/103365/2 "2007-01-28T22:57:55Z")
what are your power goals? tuning depends on what your using to tune with. not that hard to tune either of them if you have the right stuff. ---
**Author:** ![drew17](https://avatars.discourse-cdn.com/v4/letter/d/c4cdca/32.png) [@drew17](https://forums.speedlife.net/u/drew17)\ **Post date:** [January 29, 2007, 11:41am UTC](https://forums.speedlife.net/t/550cc-vs-700cc/103365/3 "2007-01-29T11:41:04Z")
well ive got a gt28rs bb turbo for starters, i also have an safc on the way, and im planning on buying a wideband soon. i would like to run about 15 pounds safely if possible ---
**Author:** ![drew17](https://avatars.discourse-cdn.com/v4/letter/d/c4cdca/32.png) [@drew17](https://forums.speedlife.net/u/drew17)\ **Post date:** [January 29, 2007, 11:42am UTC](https://forums.speedlife.net/t/550cc-vs-700cc/103365/4 "2007-01-29T11:42:03Z")
so what would be “the right stuff” then? ---
**Author:** ![mikesim](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mikesim/32/5561_2.png) [@mikesim](https://forums.speedlife.net/u/mikesim)\ **Post date:** [January 29, 2007, 12:23pm UTC](https://forums.speedlife.net/t/550cc-vs-700cc/103365/5 "2007-01-29T12:23:42Z")
550cc is all you are going to need for a GT28RS. if you go with 700’s, they’ll be harder to tune for with just an afc or e-manage. you’ll definitely need a form of stand alone to tune for such large injectors. also at low throttle, the 700’s may be under driven, giving out a spatter spray pattern, instead of a fine mist. ---
**Author:** ![GT1](https://avatars.discourse-cdn.com/v4/letter/g/b5e925/32.png) [@GT1](https://forums.speedlife.net/u/GT1)\ **Post date:** [January 29, 2007, 12:31pm UTC](https://forums.speedlife.net/t/550cc-vs-700cc/103365/6 "2007-01-29T12:31:13Z")
if your getting into enough building of a motor to require 700cc injectors your going to need more than a safc2 to tune the car. GT ---
**Author:** ![drew17](https://avatars.discourse-cdn.com/v4/letter/d/c4cdca/32.png) [@drew17](https://forums.speedlife.net/u/drew17)\ **Post date:** [January 29, 2007, 12:38pm UTC](https://forums.speedlife.net/t/550cc-vs-700cc/103365/7 "2007-01-29T12:38:21Z")
so if i were to go with the 550’s which kind would you suggest and what else should i/ have to get like z32 maf for example. ---
**Author:** ![drew17](https://avatars.discourse-cdn.com/v4/letter/d/c4cdca/32.png) [@drew17](https://forums.speedlife.net/u/drew17)\ **Post date:** [January 29, 2007, 12:40pm UTC](https://forums.speedlife.net/t/550cc-vs-700cc/103365/8 "2007-01-29T12:40:25Z")
> [@mikesim"](#): > > 550cc is all you are going to need for a GT28RS. if you go with 700’s, they’ll be harder to tune for with just an afc or e-manage. you’ll definitely need a form of stand alone to tune for such large injectors. also at low throttle, the 700’s may be under driven, giving out a spatter spray pattern, instead of a fine mist. thanks man thats good info ---
**Author:** ![Fobwall](https://avatars.discourse-cdn.com/v4/letter/f/7ea924/32.png) [@Fobwall](https://forums.speedlife.net/u/Fobwall)\ **Post date:** [January 29, 2007, 1:46pm UTC](https://forums.speedlife.net/t/550cc-vs-700cc/103365/9 "2007-01-29T13:46:44Z")
550cc is all you need. You might wanna pick up a Z32 MAF too. Try not to buy used injectors btw. ---
**Author:** ![drew17](https://avatars.discourse-cdn.com/v4/letter/d/c4cdca/32.png) [@drew17](https://forums.speedlife.net/u/drew17)\ **Post date:** [January 29, 2007, 2:25pm UTC](https://forums.speedlife.net/t/550cc-vs-700cc/103365/10 "2007-01-29T14:25:46Z")
what are a good kind of injectors to look for? ---
**Author:** ![Fobwall](https://avatars.discourse-cdn.com/v4/letter/f/7ea924/32.png) [@Fobwall](https://forums.speedlife.net/u/Fobwall)\ **Post date:** [January 29, 2007, 7:04pm UTC](https://forums.speedlife.net/t/550cc-vs-700cc/103365/11 "2007-01-29T19:04:04Z")
I’d get anything brand name. Try to stay away from no name stuff. You could get NISMO, TOMEI, BLITZ, DENSO, SARD, HKS, and so on ---
**Author:** ![drew17](https://avatars.discourse-cdn.com/v4/letter/d/c4cdca/32.png) [@drew17](https://forums.speedlife.net/u/drew17)\ **Post date:** [January 29, 2007, 8:09pm UTC](https://forums.speedlife.net/t/550cc-vs-700cc/103365/12 "2007-01-29T20:09:54Z")
awesome, 550’s it is then. thanks for the help guys.