| Topic Review (Newest First) |
| 11-12-2010 01:01 PM | |
| LT1Tunes | Running at 90% duty cycle won't hurt a thing but I do believe running at 100%+ will. I was at 105% with stock 24s, switched to SVO 30s, duty cycle dropped to 77 and gained performance. Difficult to say exactly how much as Density altitude at my track varies from 3300 to 5000 and as DSA jumps around so does ET. After continuing to tune (and learn) duty cycle is up to 90% with much less horsepower than an LE2 setup should make. If I jumped the cam up to LE2 and ran at sea level, there is no doubt that I would be over 100% duty cycle again. If for no other reason than the injector being constantly on causing increased heat, I believe lowering the duty cycle will increase performance. Just my theory based on my observations. Heck, I even see a Ford win at the track every month or so which proves you can't be right all the time. |
| 11-12-2010 11:17 AM | |
| sweetbmxrider | strange. i guess its one of those things ya know |
| 11-12-2010 11:08 AM | |
| StealthFormula |
Quote:
Originally Posted by sweetbmxrider
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repeated wot runs with nearly maxed/maxed out duty cycles can't be considered a good thing. just an observation.
It's funny because I have been told different things like you don't want to exceed 80% or 85% or even 90% with an injector but then we have Hondas that are set up to run at 100% duty cycle. I think there are alot of differing opinions on that subject. Here's some food for thought...I know of a guy who runs in a super stock racing class. He actually runs the quickest ET with the smallest injector he can get by with. Why? I have absolutely no idea. |
| 11-12-2010 10:55 AM | |
| StealthFormula |
Quote:
Originally Posted by LT1Tunes
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Sounds like what you have works for you and that's what it's all about. I'm happy for you. I wrote the results of what I observed. As far as occuring for only a short period of time, isn't it funny that tire spin, even of short duration, makes such a big difference in ET?
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| 11-11-2010 11:05 PM | |
| LT1Tunes | Sounds like what you have works for you and that's what it's all about. I'm happy for you. I wrote the results of what I observed. As far as occuring for only a short period of time, isn't it funny that tire spin, even of short duration, makes such a big difference in ET? |
| 11-11-2010 08:00 PM | |
| sweetbmxrider | repeated wot runs with nearly maxed/maxed out duty cycles can't be considered a good thing. just an observation. |
| 11-11-2010 07:24 PM | |
| StealthFormula |
Quote:
Originally Posted by LT1Tunes
View Post
I don't believe your injectors are big enough. I am running SVO 30's GM 845 cam, LE stage 1 heads 52 mm TB, open headers, stock converter. At a track elevation of 2350, I run 12. 90 @108+. My injector duty cycle at the top of each gear runs 88 to 90 percent. Since you have more motor, I would guess at sea level you are at 100% or greater.
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| 11-11-2010 07:12 PM | |
| StealthFormula |
Quote:
Originally Posted by R3DLT1
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Stealthformula your going to make ShowNoMercy noshes by displaying you LE2 times. lol
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| 11-11-2010 01:17 AM | |
| LT1Tunes |
Quote:
Originally Posted by georgia2thaheart
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I understand i have 30lb red svo injectors, delco fuel filter, walbro 255lp fuel pump, am i not getting enough fuel, the injectors should definetly be big enough right?
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| 11-09-2010 02:11 PM | |
| R3DLT1 | Stealthformula your going to make ShowNoMercy noshes by displaying you LE2 times. lol |
| 11-09-2010 01:58 PM | |
| StealthFormula |
Quote:
Originally Posted by ShowNoMercy
View Post
Its an auto, not a dyno queen.
Take it to the track, see how it runs. FWIW my LE2 setup dyno'd 360rwhp with an unlocked converter yet runs 11.40's-11.50's at 118-119 MPH in 80+ degree weather. Once I get to the track on a 0 DA day here soon I'm aiming for 11.20's at 120-121. As you can see a dyno is a tuning tool and nothing but. I was sort of discouraged myself when I only put down 360rwhp but the 1/4 mile tells the full story. Good luck. |
| 11-08-2010 01:22 PM | |
| ShowNoMercy |
Quote:
Originally Posted by georgia2thaheart
View Post
Thanks alot lloyd, i'm going to make the proper adjustments like you said if need be and get it to the track, i'm looking to trak 110+ like you said and then i'll go from there, also if the rockers need to be adjusted what setting would you recommend ? thanks for the feedback again lloyd. Once again great customer service glad i went with u as well. Also i'm sure we will get to the bottom of this
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| 11-08-2010 01:15 PM | |
| georgia2thaheart | Thanks alot lloyd, i'm going to make the proper adjustments like you said if need be and get it to the track, i'm looking to trak 110+ like you said and then i'll go from there, also if the rockers need to be adjusted what setting would you recommend ? thanks for the feedback again lloyd. Once again great customer service glad i went with u as well. Also i'm sure we will get to the bottom of this |
| 11-08-2010 11:56 AM | |
| JSK333 | 30# SVOs also require significantly different injector offsets than the stock 24#, which can rob power since the injector is not firing at the proper time when they are not set correctly. |
| 11-08-2010 10:00 AM | |
| [email protected] |
here is my email I semnt back to jamie really no idea why the #'s are so low. What you are seeing below 4500 RPM is converter flash. It happens with auto trans and stalls. The stall converter multiplies the TQ and makes the rear wheels see more TQ than the engine produces. This is why auto cars launch harder than 6 speeds. From 4500 RPM on up is the actual shape of the HP/TQ curves and the actual #'s the engine is making other than the basic HP/TQ being robbed from auto trans and stall. If you have a GOOD converter from Yank or Vigilante, A 6 speed car would only be 20 HP/TQ better across the board but if you have a TCI, B&M, Fuddle, Pro Torque, etc, converter, they will rob even more HP/TQ than this. If the converter is un locked, it will rob even more power. Soma data logs that show AFG's, L/R O2's, L/R BLM,s timing tables, TPS, A/F ratio, Knock Retard, etc at each RPM would really help. You can see it is a a lil rough up by 6000 RPM and might be floating valves (rockers too tight, etc), or ot could be running out of fuel, going lean, ignition problems, etc. Lots of ways to lose HP with a fuel injected set up. The cam is made to peak around 6300 RPM and that is about where it is doing this but that doesn't mean there is not more to gain by fixing the A/F, rocker adjustment or what ever is causing the graph to get rough above 6000 RPM. Lloyd Elliott 972-617-5671 Elliottsportworks.com |
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