Discussion in 'High Tech for Old Iron' started by real82it, Nov 2, 2015.
Great update! I had the exact same reaction on my first drive with the Fitech, "whoa!"
I love this thread With all the messages I may have missed your update on fuel mileage. Any improvements over carb? What mpg are you getting?
I improved 2 mpg in city (from 7 to 9 mpg) and 3 mpg on highway (from 11 to 14 mpg). The highway mpg improvement is what surprised me. My prev Q Jet was tuned to the engine. Cruise AF had measured fine around 14:7:1. But, I am not complaining! Nice to spend a little less on gas!
What are the specs on your wheels/tires?
I told Denny Manner with my overdrive and FI I should get better gas millage. He was very kind and did not laugh at me. At 70 mph I see about 21 to 22 lph. That works out to 11 mpg.
Best MPG I ever saw with Q-Jet or Holley or FAST EZ-EFI 1.0 (and TH400) was 11-12 MPG going to/from Somerset KY cruise in. That trip is right at 200 miles each way with about 175 of that being 70+mph highway. With the FiTech and TH2004R and locking converter I saw a solid 15 each way last year. I don't see it ever being any better than 15 MPG....
I keep thinking on the new motor that maybe I want a cam that would give just a little bit of millage. But then how would I get 800 HP?
Trade some duration @ .050" for more lift and stuff in more boost.
More boost is always the answer.
Quick update.....i did a decent amount of driving this summer. in the last 4 months I thought I was having issues with the FITech on 2 separate occasions....car starts to get sluggish....so quick to blame the unit....but BOTH were my fault! First was a dirty air filter, second was a dirty fuel filter! HaHa! Cleaned air filter, cleaned fuel filter, car is running as good as ever.
This is my next project after getting ot back on the road. After reading this thread multiple times I think I have figure out what to order. Fi without the command center, Tanks inc efi tank and fuel pump, a bunch of braided line and fittings. Run new return to the tank and ditch the MSD 6AL. Does this sound about right?
why you would dump the MSD is beyond me.
Don't know. Does it work better than the integrated FI Tech system?
If you plan to use one of the FiTech systems with timing control you need to do some research on compatible modules for your distributor before you worry about the MSD box. If timing control is not on your list of wants then the MSD will give you a good clean tach signal so all the more reason to keep it.
Your list of items to get, lacks an upgraded alternator. While you are into it adding an extra ground strap or 2 won't hurt either. Otherwise your tank and pump setup will serve you well but make sure your fuel line choice is truly rated for high pressure fuel or your garage and car will wreak of fuel as it weeps through the tubing.
As Ken said the MSD gives a good clean tach signal. Two, if it is a 2AL programmable then it is a better system for setting up timing curves than the Fitech timing control. As far as I know the MSD does not cause problems with the Fitech timing control and you would be giving away the hotter spark you got the MSD for.
I have an 85 amp alternator already. How much larger should I need?
In my opinion, the voltage regulator is much more important than the alternator amperage. Most alternators can provide sufficient amperage, but most FI systems (not sure about FI Tech) will compensate for "low voltage" (which can be anywhere from 13.2 - 14.2V depending on the system). This is because the system assumes the lower voltage will slow down the injector opening rate and/or fuel pressure.
A good 10si alternator can usually provide way more amperage than we need, but sometimes they come with crappy voltage regulators. They aren't too hard to swap out - but you need to find a good regulator.
I agree with a few others in that if you have a good msd setup, I'm not sure I'd switch to the Fitech timing control. The only real benefit I see to it is being able to tweak the timing with a few clicks of a button if you're messing with it much versus rotating the distributor.