what's the best thing to for building boost off the line?
05-25-2008, 01:41 PM
#1
On The Tree
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what's the best thing to for building boost off the line? My car is a 408ci. w/twin 70's on it w/a TH400 and transbrake. I'm having a hard time building boost at the line. My suspects are (1) it's too rich on the transbrake (my a/f gauge is pegged at 10.0!) (2) My exhaust housings are too big (.96 ar). (3) some are saying my t/c is too tight (it's a neil chance converter built custom for my setup, but it was built for 18+lbs. of boost. right now I'm only running 8lbs of boost to get used to the car)...or (4) all of the above??? Any input would be greatly appreciated!!! Thanks guys...
05-25-2008, 03:34 PM
#4
I agree with the af ratio but if you use a 2 step and a step retard and take out tons of timing on the trans brake and 2 step it will spool better but with you seup it might not be enough and then I would spray nos on the trans brake but set it up with a pressure switch to shut off at desired boost
05-25-2008, 04:24 PM
#5
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I agree with the af ratio but if you use a 2 step and a step retard and take out tons of timing on the trans brake and 2 step it will spool better but with you seup it might not be enough and then I would spray nos on the trans brake but set it up with a pressure switch to shut off at desired boost
You can try a 3rd limiter to get some heat in the turbo after the burn out, run this limiter and bump into the lights, then put it on the brake and the 2nd limiter chip for your launch. Pretty much any big single or twin race car runs a setup like this. Also your stall is important as well.
05-25-2008, 05:23 PM
#7
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keep the ideas coming! I'll be showing my builder this tuesday, so the more ideas the better. I am extremely excited at the potential of this car. It's the cam only record holder so it's been lightened to the max. It went 10.22@135 w/a 1.68 60ft. leaving off idle w/a max of 8psi on the boost. I think it'll run some 9.7's/.8's leaving on full boost...then we'll put some REAL boost to it! We built it for 8's, we just need a little help w/some bugs to work out! thanks guys
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05-25-2008, 07:04 PM
#9
TECH Apprentice
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we have to add timing, to help the engine climb onto the converter stall
also, add more boost, if the car will not rev up on the trans brake, it needs more power / torque...... more boost will do that
ash
05-25-2008, 07:25 PM
#10
Lingenfelter two step looks like it now has anitlag feature. That could work well. It does in big turbo dsm cars like my 97 talon. That is a manual though but can't see why it can't work on an auto also.I bought the lingenfelter gadget but dont have it or my system installed yet. I might go auto next season if not happy with my m6.
05-25-2008, 07:26 PM
#11
well I take lots of timing out to spool it like 20-30 degrees !! just a trick I learned from old pro stocker buddy ingersol!!
if adding timing works for your set up go with it ! if you don't have the right setup my way will melt valves. so becarefull on tring it on stock stuff
if adding timing works for your set up go with it ! if you don't have the right setup my way will melt valves. so becarefull on tring it on stock stuff
05-25-2008, 07:35 PM
#12
TECH Apprentice
well I take lots of timing out to spool it like 20-30 degrees !! just a trick I learned from old pro stocker buddy ingersol!!
if adding timing works for your set up go with it ! if you don't have the right setup my way will melt valves. so becarefull on tring it on stock stuff
if adding timing works for your set up go with it ! if you don't have the right setup my way will melt valves. so becarefull on tring it on stock stuff
yeeh, stick cars are different to auto's
sorry i was talking about auto's
no experience with sticks...
ash
05-25-2008, 11:27 PM
#15
Apparently there is a big difference between autos and sticks. The stick cars don't have ANY load, so we benefit from less spark advance, whereas auto cars have to build boost against the brake. Once launched, the strategies are pretty much the same.
05-26-2008, 06:12 AM
#16
With a manual tranny your need to pull 40 or 50 degrees to get it to spool...thats what I did and now I get 12 psi off the line...
05-26-2008, 08:03 AM
#17
40 to 50 degrees..is that a misprint?
There are also two lingenfelter two steps.The new version which think can be upgraded has antilag and the two step features. Usually auto cars can spool up a lot of boost off the line even without a trans brake. Just a good stall .Not sure what effect rear end gears have in the equation. Now big slow spooling turbos are going to likely need way higher stalls or the antilag feature.
There are also two lingenfelter two steps.The new version which think can be upgraded has antilag and the two step features. Usually auto cars can spool up a lot of boost off the line even without a trans brake. Just a good stall .Not sure what effect rear end gears have in the equation. Now big slow spooling turbos are going to likely need way higher stalls or the antilag feature.
05-26-2008, 01:53 PM
#18
guys once the engine goes in the car i will show a video of my laptop with the spool and timing ect.. i will be trying a few differant ways to see what works best for me. it trial and error with this kinda thing. the class i build my car for allows 2 power adders so i will use Nitrous if all else fails.. on the engine dyno it work like cake work almost to good!!!!
