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Old 05-07-2010, 09:50 AM   #18
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When they about the duty cycle, if they say the duty cycle is at 100%, that means your injector is maxed out and will not flow any more fuel other than what it is at. At this point , you can do two things to correct this 1-raise the fuel pressure to compensate 2- put a bigger set of injectors in. But just remember, if you do one or the other you better make sure the fuel delivery system can keep up. I work alot with the after market EFI systems like F.A.S.T. and Big stuff 3 . when I do a tuneup on a motor I dont try to let the duty cycle get past 90% , because now the tuning window is limited and also if the injector is maxed and its runs into a lean condition it has no extra fuel for correction.

Hopefully this helps
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Old 05-07-2010, 10:32 AM   #19
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Originally Posted by Xtreme Innovations & Fab View Post
When they about the duty cycle, if they say the duty cycle is at 100%, that means your injector is maxed out and will not flow any more fuel other than what it is at. At this point , you can do two things to correct this 1-raise the fuel pressure to compensate 2- put a bigger set of injectors in. But just remember, if you do one or the other you better make sure the fuel delivery system can keep up. I work alot with the after market EFI systems like F.A.S.T. and Big stuff 3 . when I do a tuneup on a motor I dont try to let the duty cycle get past 90% , because now the tuning window is limited and also if the injector is maxed and its runs into a lean condition it has no extra fuel for correction.

Hopefully this helps
Craig,

I've got the "60 lb" injectors that came with the TVS2300 and I have twin 342 Walbros intank. I logged a run this morning and right when my car was hitting redline (6600 rpms) my injector duty cycle was 90%. If I go down a couple of pulley sizes will my injectors stay close to 90% or will it push them over the edge? I've got plenty of fuel volume and pressure potential but I'm running the stock -6 line from the regulator to the fuel rail.

Thank you.
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Old 05-07-2010, 10:43 AM   #20
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i am so confused.....argh
Call me I will UNCONFUSE you.

Our Street Brawler Package uses a 3.6 pulley and fuel Pressure starts to fade a little bit at the very top but we have NO Problems with enough fuel 11.6 all the way to 6800.

The MSD Fuel Pump Voltage Booster is good insurance and easy to install, I have written a wiring schematic I include with each one I sell.

Your tune will need to be adjusted for the headers, with the headers you will lose 1 psi boost and with the pulley you will gain it back plus 1 so it is very safe.

Just finished a Street Brawler Package yesterday with a cam and few other goodies, I will be posting later with dyno sheet and video.

Ted.
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Old 05-07-2010, 10:58 AM   #21
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Originally Posted by 99-LS1-SS View Post
Craig,

I've got the "60 lb" injectors that came with the TVS2300 and I have twin 342 Walbros intank. I logged a run this morning and right when my car was hitting redline (6600 rpms) my injector duty cycle was 90%. If I go down a couple of pulley sizes will my injectors stay close to 90% or will it push them over the edge? I've got plenty of fuel volume and pressure potential but I'm running the stock -6 line from the regulator to the fuel rail.

Thank you.
When you say if you go down a couple sizes ,I have no idea how much boost that adds or the horsepower level gain you get, so its hard for me to answer that. At this point you should be alright with the 6 line ,but what we do is we monitor the fuel pressure with a electronic fuel pressure sensor that gets logged with all of our sensors, this way if the pressure drops at all during a pass we can tell its in the fuel delivery or if the injectors are to small or if we need to increase fuel pressure . For example. our base pressure is 75lbs and with every lb. of boost it will add 1 lb of fuel pressure , so if we are making 32lbs of boost going down the track we will have 107lbs of fuel pressure. We are using 16- 550lbhr Moran injectors. There at about 75% duty cycle.
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Old 05-07-2010, 11:18 AM   #22
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Sorry for being so vague.

Currently I'm at 6.5 lbs of boost and I would estimate my power to be around 500 rwhp maybe a hair below that. I haven't had it dyno'd yet so I don't know for sure. My commanded AFR is 11.4 at WOT and I'm within 3% (on the rich side) throughout a long third gear pull.

I'm currently running a 3.7" pulley with 1:1 ratio in the rear pulleys. I'm considering going down to a 3.4" or 3.5" pulley. A salesman at Magnuson claimed that each tenth of an inch reduction in pulley size is equal to a half a pound of boost. Based on that statement I would be around 8-8.5 lbs of boost.

I have an adjustable regulator set at 58 psi of line pressure. The regulator is in the trunk. I've hooked a pressure gauge up to the rail and it's got 58 psi at WOT at the rail too.

Thanks for any input and/or advice. I'm trying to learn all I can.
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Old 05-07-2010, 11:25 AM   #23
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arent the stock injectors with the maggie 60#? Im not exactly sure what you mean by duty cycle. Im trying to figure out if i am going to need to do anything other than installing the headers / pulley and get a new tune?

maybe some are shipped with different injectors,, this one had 52#@58psi gm ls9 injectors.( i even checked the part number of the injectors Bosch 0 280 158 187 )
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Old 05-07-2010, 11:34 AM   #24
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maybe some are shipped with different injectors,, this one had 52#@58psi gm ls9 injectors.( i even checked the part number of the injectors Bosch 0 280 158 187 )
That's what they are calling "60 lbs" injectors.
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Old 05-07-2010, 02:13 PM   #25
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Quote:
Originally Posted by JANNETTYRACING View Post
Call me I will UNCONFUSE you.

Our Street Brawler Package uses a 3.6 pulley and fuel Pressure starts to fade a little bit at the very top but we have NO Problems with enough fuel 11.6 all the way to 6800.

The MSD Fuel Pump Voltage Booster is good insurance and easy to install, I have written a wiring schematic I include with each one I sell.

Your tune will need to be adjusted for the headers, with the headers you will lose 1 psi boost and with the pulley you will gain it back plus 1 so it is very safe.

Just finished a Street Brawler Package yesterday with a cam and few other goodies, I will be posting later with dyno sheet and video.

Ted.

Ted,

I will call you
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Old 05-07-2010, 05:21 PM   #26
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Ted,

I will call you

There ya go.. there is a guy who would know....!

I do think not all factory pumps are equal though because I couldn't put a 3.6 after headers and exhaust. I was loosing fuel pressure and wouldn't pump any more.

5800 I was done.

headers will flow more air than you raise the boost there will be increased fuel demands if you can keep it in the 11.8 range like Ted says than go for it. it is plenty safe.

He definately knows more than I. All I do know is where I was running out of fuel...I didn't try any type of voltage booster because I was told that some were having trouble with voltage modulations and pressure modulations but they may not have been wiring them properly.

Like I said ...You got the guy who knows on the other end....That is the beauty of the net and this forum...
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Old 05-07-2010, 05:25 PM   #27
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ted got me straightened out.!!!!
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Old 05-07-2010, 05:28 PM   #28
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ted got me straightened out.!!!!
He the man...
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Old 05-08-2010, 07:39 AM   #29
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I think 3.6 is definitely the way to go with LT headers. More hp for minimal cost difference. Stays within safe boost too. I've heard about 3.4 slipping.
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Old 05-09-2010, 01:42 AM   #30
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i have the 3.6pulley but to help with fueling I added AEM's water meth injection system.
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Old 08-07-2013, 02:54 AM   #31
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I just order my 3.0 pulley and I'm upgrading to 8 rib kit as well as adding a Belt tensioner
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Old 09-10-2013, 02:49 PM   #32
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With all this talk about the 3.6 pulley. Anyone have the part # for the belt?
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Old 09-10-2013, 02:51 PM   #33
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With all this talk about the 3.6 pulley. Anyone have the part # for the belt?
The 3.8 and 3.6 use the same belt, as does the 3.4 with the JRE supertensioner.

You have to adjust the sliding Idler pulley as close the the tensioner as it will go within 1/4 inch.

I have Plenty of 3.6 and 3.4 pulleys in stock very reasonable cost.
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