Injectors/side fed

hks.mr2turbo · 04-07-2007, 12:17 PM

Hey guys what's this i hear about side fed injectors and top fed ? Doesn't the MR2 only take 4 fuel injectors one for each cylinder ? Sorry for the lame question i'm new thanks .

Sang · 04-07-2007, 12:25 PM

They are two seperate designs for a fuel rail/injector.

SARD 800cc side feed injectors

Wolfkatz Side feed fuel rail

Delphi Top feed injector

Wolfkatz Top feed fuel rail

The benefit of sidefeed injectors is that they are PnP with the stock fuel system and wiring. The top feeds require separate wiring leads for installation. In general, sidefeeds are more expensive than top feeds, and they can only support so large of an injector. I believe the RX7 secondaries/SARD 850cc high imp. injectors are the highest you can go (and either will need collar adapters to properly fit them in the rail). As opposed to top feeds where you can go 1600cc's if you'd like

Weasy2k · 04-10-2007, 07:15 PM

3s-gte is side feed and the 5s is top feed

http://wolfkatz.com has lots of good info on this stuff for the mr2s

Sang did a great job explaining most of it tho!

Enthalpy · 06-14-2007, 01:24 AM

Sang is right on with the size thing. I have noticed terrible consistency issues with side-feeds north of about 750 or 800 cc or so.

My admittedly unconclusive data is backed up by one of the side-feed suppliers my shop uses who literally asks us to take their label off the 870 side-feeds they supply.

For those that want north of 550 cc, I almost always recommend top-feeds.

04-07-2007, 12:17 PM	#1 (permalink)
hks.mr2turbo Cage Fighter Join Date: Apr 2007 Posts: 107 Thanks: 3 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Injectors/side fed Hey guys what's this i hear about side fed injectors and top fed ? Doesn't the MR2 only take 4 fuel injectors one for each cylinder ? Sorry for the lame question i'm new thanks .

04-10-2007, 07:15 PM	#3 (permalink)
Weasy2k 3.4L 10K RPM In the works Join Date: Mar 2005 Location: Vancouver, BC Posts: 8,895 Thanks: 34 Thanked 80 Times in 66 Posts iTrader Rating: (9/100% )	3s-gte is side feed and the 5s is top feed http://wolfkatz.com has lots of good info on this stuff for the mr2s Sang did a great job explaining most of it tho! __________________ -Johnny @ Sea2Sky Tuning - www.sea2skytuning.com http://www.mr2.com/forums/sea2sky-tu...-out-sale.html

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

04-07-2007, 12:25 PM	#2 (permalink)
Sang Go Magic! Join Date: Jul 2006 Location: Home: Tampa, FL School: Gainesville, FL Posts: 3,399 Thanks: 19 Thanked 220 Times in 200 Posts iTrader Rating: (5/100% )	They are two seperate designs for a fuel rail/injector. SARD 800cc side feed injectors Wolfkatz Side feed fuel rail Delphi Top feed injector Wolfkatz Top feed fuel rail The benefit of sidefeed injectors is that they are PnP with the stock fuel system and wiring. The top feeds require separate wiring leads for installation. In general, sidefeeds are more expensive than top feeds, and they can only support so large of an injector. I believe the RX7 secondaries/SARD 850cc high imp. injectors are the highest you can go (and either will need collar adapters to properly fit them in the rail). As opposed to top feeds where you can go 1600cc's if you'd like

06-14-2007, 01:24 AM	#4 (permalink)
Enthalpy EMS Harmonizer Join Date: Feb 2006 Location: Denver, CO Posts: 1,219 Thanks: 8 Thanked 54 Times in 42 Posts My Google Map iTrader Rating: (2/100% )	Sang is right on with the size thing. I have noticed terrible consistency issues with side-feeds north of about 750 or 800 cc or so. My admittedly unconclusive data is backed up by one of the side-feed suppliers my shop uses who literally asks us to take their label off the 870 side-feeds they supply. For those that want north of 550 cc, I almost always recommend top-feeds.