fuel injected igntion control for turbo, methanol

[cj011]

basically how or what would be recomended to retard timing according to boost, yes i know that the msd set up can be so for 1 pound of boost a certain amount of timing is retarded. my problem with this system is that if you are taking out to much timing, then a result of power loss will occur. also how will you be able to judge timing retard including atmosphere pressure, air density, and if you are injecting methonal or multi stage nitrous syste. with fuel injection, can the brain work with closed and open loop exhaust sensors to determin timing retard. yes i know there are high dollar systems that will do this but i am on a budget, looking for something simple like the setup on dunebuggy.com. is there something that can work with an oxygen sensor to determine timing according to fuel ration in the exhaust. after reading up on knock sensors, i dont like them due to the fact when detonation occurs they take out way to much timing instead of the right amount. thats why ls1s and camaros perform about .1-.2 faster in the quarter without the knock sensor connected. yes i know you can lock out the timing at 24 degrees, but that can lose power and possibly not be enough retarding for high boost applications and the detonation gremlins will appear. or is this all a waste because the fuel injection system will determine the correct amount of fuel so reatarding will not be necessary. oh poop my head hurts after thinking about the possibilities. thanks abunch for any replies...

[Chuck Schneider]

One word, SDS. SDS can retard the timing based on the boost pressure and or rpm and you can program in whatever you want for a retard at whatever boost pressure.
Personally I have seen no need for knock sensing in an aircooled motor. WIth the injection you can run higher boost with pump gas with no pinging what so ever. I run 14 psi with 8 to 1 compression on 94 pump gas with no problems. THis same engine with a carb could only run 8 psi in high gear and it would still ping once in a while.
With methanol detonation won't be a problem at all. The methanol will cool the charge considerably and the octane rating is well over 100. You should have no problem running up to 30 psi on methanol with the right size injectors. Talk to Tracy Grimm at TGFab.com, I think,he runs mthanol and a turbo and runs in the 5's in the 1/8 and 9's in the quarter and is going for 8's.

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12.70 @ 104

[cj011]

yea i couldnt agree more, ithink that the sds system is incredible, but its tough to swallow spending 1100 for fuel and ignition control. yikes. thanks for the help

[JohnConnolly]

another option is the new Mallory VI or VII CDI boxes. The deluxe versions have adjustable retard/boost, VERY adjustable. Just run a line to the CDI for MAP. they have a ton of other features, like 2 rev limits, 2 rev switches, etc.

[cj011]

what is the cdi, not familiar with that term. so the mallory controls fuel also or would that be something similar to a msd box setup with two step and boost retard. i rember steve mentioning about a ignition setup being around 200 hundred with a large amount of options.

[JohnConnolly]

I feel the Mallory is superior to the MSD, both distributors, and their igntion boxes.

"CDI" is Capacitive Discharge Ignition. Also, ALL CDIs (regardless of brand) offer multiple sparks (not just MSD) at lower RPMs.

The Mallory "VII" series is "equivalent" to the MSD 7s, and "VI" to 6, same deal.

VERY usable, with a menu driven option/display system on the box that you can even use with gloves on if you had to.

The pimp-daddy VI is $220 USD, the VII is $425.

John
Aircooled.Net Inc.

[This message has been edited by JohnConnolly (edited 06-29-2001).]

[Crazylarry]

Mallory makes a great product BUT Their ingnitor don't take kindly to voltage spikes.
I.E. Jump starting or boost (200amp) battery chargers

Larry