Drag Racing Discussions > Front Engine Dragsters
Injected FED's launch rpm
dusterdave173:
The best tool I have used on my car and others for launch control is leave RPM--Lower and lower until car behaves and starts to leave right High leave RPM on my injected car upsets things so bad that it ruins the run, may tire shake, fill in the blank______________________ Mine likes about 2500 RPM off footbrake
Now on my friends car when he went blown the reverse was true--when he used low leave RPM it was a nightmare --when he stalled the heck out of it --things turned around and started working like a charm
You have so much power that it is just going to be a few weeks or more before you find out what it likes
I would say less violent is way to go so lower, way lower than you think
Just my two cents worth--never had your kind of power--never will LOL
wideopen231:
All in perception I guess. I look at 1000 hp and think man this little thing is going to need some boost to get fun.Its like my Harley never gets enough power to suit. Then I thought well dragster made 3000 hp weighed 2000 lbs so a 750 lb harley needs about 1000 hp to get to same fun meter reading.
I think lower power car may have problem getting up on tire,so you have to go other way.As Dave said with high power cars(meaning blower power) you have to hit it hard and get it up on the tire. This biggest thing we did with our TA/FC,but thats total different deal. I know Frank Parks said getting on tire was key to getting strong run w/o shake. I also know most Jr. fuel guys leave pretty hard,while smaller motors they are fairly stout power wise. Judging from numbers I would say most Jr. fuel guys are 800 hp or more and guessing more. Maybe Jon can chime in on this.
Dave maybe right about lower than I am thinking. My thoughts are 4500 maybe 5000 starting point,make moves in 500 increments till zeroing in on what works. Bad thing is around here T&T nights mean lots of street junk and lousy track,but if can get down junk track good track should be easy.LOL On my old RED with BBC,3 spd lenco and clutch I staged on shift light,to my understanding the starting line crew came to life 8000 and drop clutch,Yea what kind of idiot has 3 spd lenco in a bracket car? Don't try that at home and didn't work to well either.
wideopen231:
--- Quote from: gregm784 on August 30, 2018, 01:23:32 PM ---We race on a .4 Pro tree. i too have a SLE. When we are both in, my foot goes to the wood, blades crack, to around 5000rpm, and the SLE opens with the brake release.
--- End quote ---
Almost exactly what I want on mine to do ,except want it to work on full tree. Don't want it sitting there at 5000 dropping cylinder every other with BV wideopen and holding for 1 to 1.1 seconds.At 5000(2500 engine) that is about 3.5 to 4 gpm . 1 second doesn't sound like much to most,but look at a data download and how much crap happens in 1 second.
Curly1:
My stall is 6400 RPM and my two step is 4400.
dusterdave173:
--- Quote from: wideopen231 on August 31, 2018, 09:34:02 AM ---All in perception I guess. I look at 1000 hp and think man this little thing is going to need some boost to get fun.Its like my Harley never gets enough power to suit. Then I thought well dragster made 3000 hp weighed 2000 lbs so a 750 lb harley needs about 1000 hp to get to same fun meter reading.
I think lower power car may have problem getting up on tire,so you have to go other way.As Dave said with high power cars(meaning blower power) you have to hit it hard and get it up on the tire. This biggest thing we did with our TA/FC,but thats total different deal. I know Frank Parks said getting on tire was key to getting strong run w/o shake. I also know most Jr. fuel guys leave pretty hard,while smaller motors they are fairly stout power wise. Judging from numbers I would say most Jr. fuel guys are 800 hp or more and guessing more. Maybe Jon can chime in on this.
Dave maybe right about lower than I am thinking. My thoughts are 4500 maybe 5000 starting point,make moves in 500 increments till zeroing in on what works. Bad thing is around here T&T nights mean lots of street junk and lousy track,but if can get down junk track good track should be easy.LOL On my old RED with BBC,3 spd lenco and clutch I staged on shift light,to my understanding the starting line crew came to life 8000 and drop clutch,Yea what kind of idiot has 3 spd lenco in a bracket car? Don't try that at home and didn't work to well either.
--- End quote ---
I go test now on RACE night--I get two to three test runs on good track and first round on great track--and ..get lucky and strap one on somebody you get another free run so lots of incentive to nail them ! I NEVER go on T&T nights ever--good way to wreck your stuff Kids in 4wd Pickups dropping rocks on track and AC drains --not me man
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