305 TBI ignition - Chevy Impala SS Forum
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post #1 of 12 (permalink) Old 08-31-2002, 05:31 PM
CarNutt
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In my everlasting quest for better fuel efficiency. It is time to move up to getting a new ignition system to replace the good old optispark, as well as some new spark plug wires. I wanted to see if I can get some suggestions for which system. If you could, I would like specifics as to which company as well as the model number.
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post #2 of 12 (permalink) Old 08-31-2002, 10:07 PM
threeimpalas
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The TBI cars do not have an OptiSpark. They use the good ol' standard small block distributor setup. I'd suggestion just doing an R&R on the distributor and replace the wires and plugs.
post #3 of 12 (permalink) Old 08-31-2002, 10:18 PM
CarNutt
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I already have the plugs installed and I am already know which wires to get, now I need to know which distributor and coil to get.
 
post #4 of 12 (permalink) Old 09-02-2002, 09:47 AM
'94XTHP
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Unless you are having problems with the distributor itself, I would replace the cap and rotor, and maybe the coil with an upgraded unit from Accel or one of the other quality ignition vendors. It's hard to improve on the old HEI without spending some bucks.
post #5 of 12 (permalink) Old 09-02-2002, 11:27 AM
CarNutt
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well, from what I have been hearing, and therefore planning, is to go all MSD ignition system components all around, I don't know how they made their systems better, if they even did, but, every inch of benefit counts
post #6 of 12 (permalink) Old 09-02-2002, 01:53 PM
kdrolt
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I'm going to save you some trouble and unneeded costs.

1. as mentioned, 94-96 cars get the optispark. You have the predecessor HEI (high energy ignition).

2. the HEI is an excellent system.

3. MSD boxes, among others, won't help you. You haven't done anything to your engine to demand hotter, or multiple, ignition sparks.

4. Also as perviously mentioned, spend the moey to refurb what you have: new coil, new cap & rotor, new wires. Also get a new sensor pickup for the INSIDE of the distributor. When you put it all back together, get the timing set to the stock spec.

5. You want more fuel economy? Upgrade the exhaust to the 92-93 9C1 ypipe and use a good low restriction aftermarket muffler. Leave the stock air filter but plumb the passenger side of the plastic "toaster" filter box for a second cold air feed. More cold air, slightly better air intake breathing, and a better exhaust, plus the ignition work will help you a LOT. IF you do these items, then you can probably benefit from advancing the base distributor timing by 2 to 4 degrees. It will help power and economy.

6. Have you taken the TBI off, taken it apart, cleaned it, and then rebuilt it with new gaskets? A GM TBI rebuilt kit would help.

7. Replace the fuel filter, check (or replace the air filter), change the oil and filter in the engine, remove and clean the PCV valve. Check the tire air pressure and make sure you have 35 psi in each one. Draining & cleaning the trans pan, adding a new tranny filter, and then refilling with fresh ATF can also help economical performance when the converter isn't locked up.

Most of the above are std maintenance items that are needed for optimum fuel economy. A few of them are cheap performance upgrades that will also help fuel economy.

There's probably a few more things besides these, but these are the basics. HTH. - Ken
post #7 of 12 (permalink) Old 09-04-2002, 03:04 AM
Dan 91 9c1
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what's the difference in the y pipe from the 92-93 9c1's than the 91 9c1's. just curious cause ive already opened up my exhaust and have a dual air intake system for my 9c1. i also have been considering the msd setup.
post #8 of 12 (permalink) Old 09-04-2002, 07:24 AM
92CapriceOnDubs
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-Dan- Do you have pics of your dual air intake system? I'm interested in knowing what it looks like and what it is involved in doing the Mod.

I have another question too. How difficult is it to install a y-pipe from a 92-93 9c1 on a non 9c1 92 caprice with the 305? and would the dual exhaust off one of those cars work or would i have to go the custom route?
thanks
post #9 of 12 (permalink) Old 09-04-2002, 07:56 AM
kdrolt
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<BLOCKQUOTE>quote:</font><HR>Originally posted by Dan 91 9c1:
what's the difference in the y pipe from the 92-93 9c1's than the 91 9c1's. just curious cause ive already opened up my exhaust and have a dual air intake system for my 9c1. i also have been considering the msd setup. ...... 91 9c1 Dual air intake system, gaterback belt, dual flowmaster exhaust,160 t-stat, ss grille, clear corners, more mods to come <HR></BLOCKQUOTE>

92-93 9C1 with LO5 got a larger diameter Ypipe, along with supposedly better cats. The 91 LO5 9C1, along with all the other 89-93 cars, got a smaller diameter Ypipe.

If you've modded the exhaust, and added a decent cold air, then you might alter (advance) the timing a little bit, and do the quarter mod which will raise the fuel pressure slightly. As the engine is breathing a bit better, you need a little bit more fuel and a slightly advanced spark to take full advantage.

The MSD is not likely to add anything. IMO.
post #10 of 12 (permalink) Old 09-04-2002, 06:02 PM
CarNutt
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What is the quarter mod? Also, is there a certain brand of ignition system products that is preferred?
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