injector size????????
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Member
Joined: Jun 2002
Posts: 102
Likes: 0
From: florida
Car: 86 iroc
Engine: 355 400hp
Transmission: 700r4 race built
Axle/Gears: 4.10 posi
injector size????????
iam changing out my 305 tpi to a 355 tpi. i will have ported plenum throttle body and runners , big mouth intake,full exhuast no cats, port and polished 305tpi heads with 2.02/1.60 valves. comp magnum cam duration of @.050 244/244 lift .501/.501 110 lobe separation. ihave 350 computer with chip and high flow holley fuel pump. what size injectors at what fuel pressure should i use
any help would be greatly appreciated
any help would be greatly appreciated 
Joined: Jun 2003
Posts: 5,028
Likes: 78
From: Desert
Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: 8.8 with 3.73s
port and polished 305tpi heads with 2.02/1.60 valves. comp magnum cam duration of @.050 244/244 lift .501/.501 110 lobe separation.
Ummmm. It is possible to put 2.02 valves in 305 heads. But the amount fo valve lift allowed is not close to .501. That is alot of Valve shrouding though. That cam seems like it would be off for what you would want. 110 LSA would be harder to tune than a 112 or 114. That 244 duration with the 110 seems to high. The peak for the cam might be close to 6,000 RPM. Seems too high.
Anyways, Everyone and their brother seems to claim good results with 24-28 lbs/hr.
On a side note. Anyone who says "You can never go too big (for a daily driven car)" or "try 40s" Has probably never had the pleasure of knowing someone who was running rich because it was "more power." Washed the oil off the cylinder walls and scored the pistons.
Ummmm. It is possible to put 2.02 valves in 305 heads. But the amount fo valve lift allowed is not close to .501. That is alot of Valve shrouding though. That cam seems like it would be off for what you would want. 110 LSA would be harder to tune than a 112 or 114. That 244 duration with the 110 seems to high. The peak for the cam might be close to 6,000 RPM. Seems too high.
Anyways, Everyone and their brother seems to claim good results with 24-28 lbs/hr.
On a side note. Anyone who says "You can never go too big (for a daily driven car)" or "try 40s" Has probably never had the pleasure of knowing someone who was running rich because it was "more power." Washed the oil off the cylinder walls and scored the pistons.
http://www.smokemup.com/auto_math/edrags_test.php
Check out this site, I got the link from FruityOne. You have to register for it, but you get all kinds of cool performance calculators. Three of them deal with proper injector sizing and fuel pressure. Very cool stuff
If I had to guess I'd say 24lb/hr injectors at stock pressure should be a good starting point, then tune pressure from there. Or you could come over to the DIY-PROM board and learn to burn your own chips. Then you can REALLY dial in the fuel tables...
Check out this site, I got the link from FruityOne. You have to register for it, but you get all kinds of cool performance calculators. Three of them deal with proper injector sizing and fuel pressure. Very cool stuff
If I had to guess I'd say 24lb/hr injectors at stock pressure should be a good starting point, then tune pressure from there. Or you could come over to the DIY-PROM board and learn to burn your own chips. Then you can REALLY dial in the fuel tables...
Supreme Member
Joined: Jul 1999
Posts: 2,149
Likes: 4
From: Mims, Florida
Car: '87 IROCZ
Engine: 395 ZZ4
Transmission: ProBuilt 700R4
Axle/Gears: 9 bolt 3.70s
I would install 24#/hr Ford Racing injectors. I have them, they work great. Along with an AFPR, you should be able to flow up to 28#/hr fuel to power your car. This is enough fuel to support 380 HP.
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