injector size?
12-17-2006, 08:15 PM
#3
Originally Posted by caviness
what size injector for 450 to 550 rwhp? will my stock 2000 model injectors be big enough for 400 to 475?
12-17-2006, 10:30 PM
#5
42s are more than enough, even on juice or FI at those power levels... towards 475 rwhp you'd want to look closely at duty cycle if your getting there FI, but should still be fine.
Stock, despite some folks claims, are really beyond their ability to supply enough fuel SAFELY around 400.
Also... the 2000 injectors flow a bit less than the 98 or 01/02, so you'd be even further beyond the limits.
You could go 36, but the price of 42s is often lower than for 36s. And be aware that the Accel injectors have been known to fall short of advertised flow, sometimes dangerously so. Do a search for 42s you'll find some good deals out there.
Seriously consider pump upgrades as well, the Racetronics kit is well thought of.
Stock, despite some folks claims, are really beyond their ability to supply enough fuel SAFELY around 400.
Also... the 2000 injectors flow a bit less than the 98 or 01/02, so you'd be even further beyond the limits.
You could go 36, but the price of 42s is often lower than for 36s. And be aware that the Accel injectors have been known to fall short of advertised flow, sometimes dangerously so. Do a search for 42s you'll find some good deals out there.
Seriously consider pump upgrades as well, the Racetronics kit is well thought of.
12-18-2006, 12:09 AM
#6
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Originally Posted by Boodyrider
42s are more than enough, even on juice or FI at those power levels... towards 475 rwhp you'd want to look closely at duty cycle if your getting there FI, but should still be fine.
Stock, despite some folks claims, are really beyond their ability to supply enough fuel SAFELY around 400.
Also... the 2000 injectors flow a bit less than the 98 or 01/02, so you'd be even further beyond the limits.
You could go 36, but the price of 42s is often lower than for 36s. And be aware that the Accel injectors have been known to fall short of advertised flow, sometimes dangerously so. Do a search for 42s you'll find some good deals out there.
Seriously consider pump upgrades as well, the Racetronics kit is well thought of.
Stock, despite some folks claims, are really beyond their ability to supply enough fuel SAFELY around 400.
Also... the 2000 injectors flow a bit less than the 98 or 01/02, so you'd be even further beyond the limits.
You could go 36, but the price of 42s is often lower than for 36s. And be aware that the Accel injectors have been known to fall short of advertised flow, sometimes dangerously so. Do a search for 42s you'll find some good deals out there.
Seriously consider pump upgrades as well, the Racetronics kit is well thought of.
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12-18-2006, 08:03 AM
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Originally Posted by 2 fast 2000
The reason they flow less is because there smaller. 98,01,02's have bigger injectors (28lbs) from the factory. I have a 2000ss h/c, bolt-ons, and a 150 shot. At 560rwhp+ my injectors are fine, and they are factory 26lbs. Ran the car for over 100 passes and never had a problem. However I agree with you on the fuel pump upgrade though!
12-18-2006, 10:38 AM
#10
Yes, this sorta is the wrong place to post this, as it belongs in the fuel system section, but either way, here are my thoughts:
If you monitor your fuel pressure like I do, you'll quickly see that the stock fuel systems in these cars drop pressure with increased load. This requires the injectors to stay open longer to compensate for the pressure drop to keep the fueling where it needs to be, driving your injector duty cycle up. So really, there are a couple options here:
1. You get larger injectors that can compensate for any fuel pressure deviations without getting over 80% duty cycle
2. You upgrade the fuel pump
3. You find a way to regulate the fuel pressure so that it stays steady at the rails
In reality, it will probably take a combination of all three to get where you need to be with your fuel system. If you want to take the easier/cheaper way out, get some 42 lb/hr injectors and a Racetronix plug and play system. That should get you where you need to be. You wouldn't need as large of an injector if you could keep the rail pressure constant though, and I'm not sure how to fix that...yet.
If you monitor your fuel pressure like I do, you'll quickly see that the stock fuel systems in these cars drop pressure with increased load. This requires the injectors to stay open longer to compensate for the pressure drop to keep the fueling where it needs to be, driving your injector duty cycle up. So really, there are a couple options here:
1. You get larger injectors that can compensate for any fuel pressure deviations without getting over 80% duty cycle
2. You upgrade the fuel pump
3. You find a way to regulate the fuel pressure so that it stays steady at the rails
In reality, it will probably take a combination of all three to get where you need to be with your fuel system. If you want to take the easier/cheaper way out, get some 42 lb/hr injectors and a Racetronix plug and play system. That should get you where you need to be. You wouldn't need as large of an injector if you could keep the rail pressure constant though, and I'm not sure how to fix that...yet.