well I'm kinda lost I just did a topend kit w/ a tfs stage 2 stage 3 port and polish 351 w heads w/ all tfs goodies and a typhon intake and 70mm p.p. t.b. now my question is do I need 24 or 30 lb injectors I will also be using a 150 dry shot. Any help would be great. Need to know in a hurry the summit truck should be here any day to drop off the jets for the 150 shot. thanks in advance.
24's or 30's
- Thread starter cjnecessary
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Injector HP ratings: divide flow rating by.5 and multiply the result by the number of injectors. This uses a 100% duty cycle. These ratings are for naturally aspirated engines.
Example:
19/.5 = 38, 38 x 8 = 304 HP
24/.5 = 48, 48 x 8 = 384 HP
30/.5 = 60, 60 x 8 = 480 HP
The preferred duty cycle is about 85% maximum, so for a safety factor multiply the final figure times .85.
304 HP x .85 = 258 HP
385 HP x .85 = 326 HP
480 HP x .85 = 408 HP
Remember that the above ratings are at 39 PSI. Increasing the pressure will effectively increase the flow rating. Example: a 19 lb injector will flow 24 lbs at 63 PSI, and a 24 lb injector will flow 30 lbs at 63 PSI.
See http://users.erols.com/srweiss/ to get the calculators used in these examples.
Example:
19/.5 = 38, 38 x 8 = 304 HP
24/.5 = 48, 48 x 8 = 384 HP
30/.5 = 60, 60 x 8 = 480 HP
The preferred duty cycle is about 85% maximum, so for a safety factor multiply the final figure times .85.
304 HP x .85 = 258 HP
385 HP x .85 = 326 HP
480 HP x .85 = 408 HP
Remember that the above ratings are at 39 PSI. Increasing the pressure will effectively increase the flow rating. Example: a 19 lb injector will flow 24 lbs at 63 PSI, and a 24 lb injector will flow 30 lbs at 63 PSI.
See http://users.erols.com/srweiss/ to get the calculators used in these examples.
You do know that with dry kits the jetting changes with different injectors, right?
Call the manufacturer and ask. Or check out this link: http://www.dfwstangs.net/tech/nostech.html
This is the link I used years ago when I had the gas on my car and when I switched to 30's. This is assumming you have an NOS 5115 dry kit?
This is the link I used years ago when I had the gas on my car and when I switched to 30's. This is assumming you have an NOS 5115 dry kit?
jimdrechsler
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- Jun 29, 2006
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does the 5115 kit come with all the sims they are talking about and tee's on that link you have there? i dont reember mine having all the extras to do that. i think i am running a 100 shot now, but would like to go up if i can. are they easy to add? anyone have pics as to what they are talking about and how to do it?
thanks
