The octane booster more than likely not solve your problem. It'd be easier for you to mark your dizzy for where the timing currently sits. Then retard it when you tow. Then put it back to the mark when your done. Cheapest and simplest.
Its an MSD dizzy. I am running it straight out of the box as recommended by Crow Cams for my camshaft. It has 20 degrees advance from the factory and has the heaviest springs installed. It has just been on the dyno. I cant remember what he said the initial advance was, 12 degrees or therabouts I think. It also pings a little bit with the air on at the same speed (no trailer)
If it's an MSD Pro-Billet install the black bushing to give you 18deg centrifigal advance and that may be enough to help out. With the two heavy silver springs your total would be coming in quite late - 4000rpm+, so you can't do much better there.
Don't know about the advice from your cam supplier, but generally the bigger the cam then usually the more initial advance and less centrifigal. I run 18 static and 18 centrifigal = 36 total, pings it arse off on straight 98 but personally I always use an octane booster - toluene - and it works great for me though some others on this forum disagree.
The retard control sounds good. Is that suitable for use with a ready to run MSD? I dont have a 6AL or anything, just a ready to run dizzy. Will putting the black bush in do anything if its pinging at part throttle only. It stops when you give it a bootfull.
The timing retard only works with the control box's so you luck out there unfortunately. If you've got the dosh a 6AL and timing control is worth it in my view if you are chasing every last bit of HP out of the engine.
If your pinging at part throttle then the timing curve is too fat too early. The black bushing will help.
I dont want a 6AL because I have nowhere to put it. Except maybe under the driver's seat and I cant be bothered with all that mucking around. The main reason I didnt get one is that my tacho wont work with it. The tach adaptor and retard control is just extra wiring, and in my opinion complications that I dont need. I even bought a mechanical fuel pump to save on wiring. What I have now is quite neat, just 3 wires and the coil mounted under the battery tray where its easy to hook up the main harness. I would like a rev limiter though to protect my motor from dickheads and mechanics.
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