Need help sizing injectors
Thread Starter
On The Tree
Joined: Sep 2010
Posts: 155
Likes: 0
From: Livonia/Plymouth, MI
Need help sizing injectors I've recently done a lot of mods for my car, and the next thing I'm looking at is injectors. I'm pretty much a noob when it comes to fuel systems, so I need some schooling.
Up to this point, I just planned on using my stock injectors. I emailed a contact I have at a tuner in the area, and he said he was pretty sure I was gonna need injectors for my setup. Not really sure how I missed that before, so now I'm gonna have to get that figured out before a tune happens.
Obviously I need enough fuel supply to keep up with how much airflow will be going in with the heads and cam, but as far as figuring out how much injector I need, I don't really know where to start. I have old flow numbers for the heads, but I didn't get them flow tested after they were repaired and modified for the oversized valves I added. Here's the mod list, as it pertains to airflow stuff:
· Lunati Voodoo 60121 cam (Advertised Duration (Int/Exh): 270/278, Duration @ .050 (Int/Exh): 219/227, Gross Valve Lift (Int/Exh): .515/.530, LSA/ICL: 112/106, Valve Lash (Int/Exh): Hyd/Hyd, RPM Range: 1800-6000
· Custom ported aluminum stock heads with oversized valves
· EGR, AIR, and cat delete
· Pacesetter longtubes, custom true duals
· SLP cold air
· Smooth intake elbow, throttle body airfoil, de-screened MAF
I still have totally stock fuel systems, other than the braided stainless fuel lines.
So...anybody got some pointers?
Up to this point, I just planned on using my stock injectors. I emailed a contact I have at a tuner in the area, and he said he was pretty sure I was gonna need injectors for my setup. Not really sure how I missed that before, so now I'm gonna have to get that figured out before a tune happens.
Obviously I need enough fuel supply to keep up with how much airflow will be going in with the heads and cam, but as far as figuring out how much injector I need, I don't really know where to start. I have old flow numbers for the heads, but I didn't get them flow tested after they were repaired and modified for the oversized valves I added. Here's the mod list, as it pertains to airflow stuff:
· Lunati Voodoo 60121 cam (Advertised Duration (Int/Exh): 270/278, Duration @ .050 (Int/Exh): 219/227, Gross Valve Lift (Int/Exh): .515/.530, LSA/ICL: 112/106, Valve Lash (Int/Exh): Hyd/Hyd, RPM Range: 1800-6000
· Custom ported aluminum stock heads with oversized valves
· EGR, AIR, and cat delete
· Pacesetter longtubes, custom true duals
· SLP cold air
· Smooth intake elbow, throttle body airfoil, de-screened MAF
I still have totally stock fuel systems, other than the braided stainless fuel lines.
So...anybody got some pointers?
Good working condition 24# injectors should be enough, this assumes though that your stockers flow as good as they should. 30# svo injectors would be a good replacement.
Stock lines will work, stock fuel pump as well. If you decide to replace the pump depending on age and condition the racetronix kit with a single 255lph pump would be a good upgrade.
Stock lines will work, stock fuel pump as well. If you decide to replace the pump depending on age and condition the racetronix kit with a single 255lph pump would be a good upgrade.
No idea off the top of my head but iirc 03-04 cobras had 42# injectors and the 5.4 supercharged lightnings had 39 or 36# injectors. Both are good options as well with more room for growth
That having been said.....I have a set that I'm about to have refurbished and the sell them off.
PM if you'd be interested in them 'as-is' or refurbished.
KW
Thread Starter
On The Tree
Joined: Sep 2010
Posts: 155
Likes: 0
From: Livonia/Plymouth, MI
Someone at the dealership should be able to get you a part number for those. But I haven't seen a new set of those being sold in years, so no idea of their availability.
That having been said.....I have a set that I'm about to have refurbished and the sell them off.
PM if you'd be interested in them 'as-is' or refurbished.
KW
That having been said.....I have a set that I'm about to have refurbished and the sell them off.
PM if you'd be interested in them 'as-is' or refurbished.
KW
Also, I'll send you a PM about your injectors.
Thread Starter
On The Tree
Joined: Sep 2010
Posts: 155
Likes: 0
From: Livonia/Plymouth, MI
A guy I know recommended these, which he had just gotten for his car:
http://www.ebay.com/itm/272066909441?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT&rmvSB=true
flow-matched refurbished Denso Bosch-style 36# injectors. Seems pretty hard to beat at that price point.
http://www.ebay.com/itm/272066909441?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT&rmvSB=true
flow-matched refurbished Denso Bosch-style 36# injectors. Seems pretty hard to beat at that price point.
