Stock injectors
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#8
Mr. Links
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I'm not suggesting everyone go out and do it, but it most certainly can be done and has been for years.
#10
Mr. Links
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https://www.rx7club.com/showpost.php...4&postcount=25
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#14
Lets Go Hokies!
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+1, been done by many people
I didn't always feel 'comfortable' running 14 psi on the stock fuel system, but I always had the wideband hooked up and everything was fine. I am sure my injector duty cycles were close to 100%, lol (couldn't datalog them... only an rx7.com chipped ECU). 90% of the time I drove around on 10psi.
BTW, at 10psi I put down 300whp uncorrected on a humid 95 degree day. No fan either, lol. I am sure that on a standard day with 14psi I was around 350whp.
I didn't always feel 'comfortable' running 14 psi on the stock fuel system, but I always had the wideband hooked up and everything was fine. I am sure my injector duty cycles were close to 100%, lol (couldn't datalog them... only an rx7.com chipped ECU). 90% of the time I drove around on 10psi.
BTW, at 10psi I put down 300whp uncorrected on a humid 95 degree day. No fan either, lol. I am sure that on a standard day with 14psi I was around 350whp.
#15
wannaspeed.com
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here is a fuel calculator to try different injector sizes to guesstimate the amount of power potential. http://rx7.com/cgi-local/3rdgencalc.cgi
According to that calculator the stock injectors are good for 338 FLYWHEEL HP @ 80% duty. Course i don't know how accurate that calculator is.
Increased fuel pressure from an aftermarket FPR could allow for more HP, and old/dirty injectors that don't flow like they used to will run less HP. It's all relative to what setup you're running, and how lean you're tuning. Shoot you could run a wet nitrous system and get another 75 hp without using a drop more fuel from the injectors.
According to that calculator the stock injectors are good for 338 FLYWHEEL HP @ 80% duty. Course i don't know how accurate that calculator is.
Increased fuel pressure from an aftermarket FPR could allow for more HP, and old/dirty injectors that don't flow like they used to will run less HP. It's all relative to what setup you're running, and how lean you're tuning. Shoot you could run a wet nitrous system and get another 75 hp without using a drop more fuel from the injectors.
#17
Cheap Bastard
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Been done. You guys can call it rubbish if you like, but it's been done before...
https://www.rx7club.com/showpost.php...4&postcount=25
https://www.rx7club.com/showpost.php...4&postcount=25
#18
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For fairly cheap you can get a set of used stock 850's, have them cleaned, and a stock primary rail, have the rail milled (there is someone on the forum that does it for 10 dollars) and upgrade your primary's to 850's and then comfortably be able to make 350+ WHP without passing 85% DC. You could probably do all this for around 100 dollars.
#19
Rotary Freak
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those hp claims on stock turbos were done on 93-94 octane fuel. 91 octane Ca gas is totally different. 300-320rwhp is very typical for stock turbo/fuel system in CA.
I made 403rwhp@14.5psi on stock injectors back in 97 with the PFS gold box. Injectors were maxed out at 6500rpm and A/f was still within safe margin. However, VE, atomization and AIT comes into play in this senerio.
I remembered losing hp by putting the 1600cc injectors in place of the 850 due to poorer atomization (20rwhp). It all depends on the entire system and what it likes.
Calculations and simulations are just that, it predicts what it should/capable of doing. Real life suituation is what counts.
I made 403rwhp@14.5psi on stock injectors back in 97 with the PFS gold box. Injectors were maxed out at 6500rpm and A/f was still within safe margin. However, VE, atomization and AIT comes into play in this senerio.
I remembered losing hp by putting the 1600cc injectors in place of the 850 due to poorer atomization (20rwhp). It all depends on the entire system and what it likes.
Calculations and simulations are just that, it predicts what it should/capable of doing. Real life suituation is what counts.
Last edited by pluto; 05-21-08 at 07:47 PM.
#23
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Recently, I read a post that pointed to an online calculator that gave resulting fuel flow and horsepower based on injector size, fuel pressure, duty cycle etc... I can't find it now. If anyone knows where it was, it was very informative.
#24
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Sure it didn't have anything to do with the high imp injector controller used with resistors and low imp injectors?
There have been a few posts latley about gains by swapping to the FJO peak and hold driver.
There have been a few posts latley about gains by swapping to the FJO peak and hold driver.
#25
Original Gangster/Rotary!
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