are 60lb's too mush?
11-29-2007, 01:03 PM
#1
are 60lb's too mush? i am getting ready to install a sts kit hopefully running arount 9.5.1 and 8psi on a t3/t4 turbo......have been told to do the walbro 255 and a hotwire kit and 60lb injectors......are 42's going to be enough or should i spend the extra 50.00 and never have to buy injectors again....haha
let me know what ya think
thanks john
let me know what ya think
thanks john
11-29-2007, 11:12 PM
#7
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Be sure to get some kind of fuel pressure regulator... those 60#ers are going to have you rich as hell at idle and low rpms
i took the 60#er dive cuz people up here said yeh go ahead and get them... well soon to discover THEY WERE TOO BIG OF AN INJECTOR FOR MY SETUP AND MY CAR!!!!
think wisely when buying your injectors... i currently have 42#ers in my car which are actually sqrt(58psi/43.5psi) * 42 = 48 # injectors
i have 2 excel sheets that i can give you that can aid in deciding your injectors and fuel needs.
if you go too big... you will have a rich idle
i took the 60#er dive cuz people up here said yeh go ahead and get them... well soon to discover THEY WERE TOO BIG OF AN INJECTOR FOR MY SETUP AND MY CAR!!!!
think wisely when buying your injectors... i currently have 42#ers in my car which are actually sqrt(58psi/43.5psi) * 42 = 48 # injectors
i have 2 excel sheets that i can give you that can aid in deciding your injectors and fuel needs.
if you go too big... you will have a rich idle
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11-30-2007, 05:14 PM
#8
I tuned a set on a stock car (boost referenced fuel system and not a single mod) for someone delivering their car to a shop for an install and had no problem with them at all. I have them on my lowly 8.5:1 SCR 347 and likewise have no idle injector control issues. I have tuned them in LOTS of setups that are stock-inch without an uncontrolable idle AFR.
If you tossed them in and just filled in the IFR table they are gonna run like ***. You need a closer offset table the real sticklers are the short pulse limits and adders. This is how you make them work as intended.
If you tossed them in and just filled in the IFR table they are gonna run like ***. You need a closer offset table the real sticklers are the short pulse limits and adders. This is how you make them work as intended.
11-30-2007, 10:29 PM
#9
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I tuned a set on a stock car (boost referenced fuel system and not a single mod) for someone delivering their car to a shop for an install and had no problem with them at all. I have them on my lowly 8.5:1 SCR 347 and likewise have no idle injector control issues. I have tuned them in LOTS of setups that are stock-inch without an uncontrolable idle AFR.
If you tossed them in and just filled in the IFR table they are gonna run like ***. You need a closer offset table the real sticklers are the short pulse limits and adders. This is how you make them work as intended.
If you tossed them in and just filled in the IFR table they are gonna run like ***. You need a closer offset table the real sticklers are the short pulse limits and adders. This is how you make them work as intended.
12-04-2007, 01:48 PM
#12
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#60 Motrons are only $360 at Speed Inc. About the same as #42's
http://www.ls1speed.com/catagory.cfm...%20/%20Cooling
http://www.ls1speed.com/catagory.cfm...%20/%20Cooling
12-04-2007, 05:16 PM
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12-04-2007, 06:32 PM
#16
Yep, good choice on going with the 60#'s to begin with. Buying new injectors is never a bad idea either, especially with them for $360 shipped at Speed Inc. Most people try to get around $350 for them used anyways (crazy now with the low $360 price 
)
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12-04-2007, 09:46 PM
#17
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there are issues with getting the larger injectors. The larger the injector the higher the idle rpm you have to run. The injector has a minimum pulse width and an injector that is to big will dump to much fuel (it can't help it) this will cause some surging issues (to much fuel) and to compensate for the extra fuel and to stop the surging you have to either subtract fuel (you can't) or add air which raises the idle rpm.
12-05-2007, 08:19 AM
#18
there are issues with getting the larger injectors. The larger the injector the higher the idle rpm you have to run. The injector has a minimum pulse width and an injector that is to big will dump to much fuel (it can't help it) this will cause some surging issues (to much fuel) and to compensate for the extra fuel and to stop the surging you have to either subtract fuel (you can't) or add air which raises the idle rpm.
12-09-2007, 04:22 PM
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Sorry to hijack, but which are better: Motron or Mototron? Is one of them an imitation or something?
*EDIT* Found out they are the same. Some people just misspell them. Mototron is the correct name(siemens injectors)
*EDIT* Found out they are the same. Some people just misspell them. Mototron is the correct name(siemens injectors)
Last edited by 67camaro; 12-09-2007 at 04:42 PM.