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#1
04-09-2003, 05:28 PM
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After a V-8 transplant with a originally 4cylinder powered Toyota Celica, I hooked the HEI tach terminal to the factory tach. Works fine except that it seems to be reading double the actual RPM. Obviously, this is because it is designed for a 4 cyl. car but I'd like to keep the factory guages. Is there anything that can be done to rectify this?
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#2
04-09-2003, 05:28 PM
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After a V-8 transplant with a originally 4cylinder powered Toyota Celica, I hooked the HEI tach terminal to the factory tach. Works fine except that it seems to be reading double the actual RPM. Obviously, this is because it is designed for a 4 cyl. car but I'd like to keep the factory guages. Is there anything that can be done to rectify this?
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#3
04-09-2003, 06:27 PM
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I haven't a clue, but the following thoughts came to mind:
(A) disconnect half of the spark plugs??? (B) take your SBC buddies for a ride. Tell them the speed is slow because the car has a 6.37 rear gear! Ask them if their SBC will REV like your Pontiac. Jon. Good carburetion is fuelish hot air.
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"Good carburetion is fuelish hot air".  "The most expensive carburetor is the wrong one given to you by your neighbor". If you truly believe that "one size fits all" try walking a mile in your spouse's shoes! Owner of The Carburetor Shop, LLC (of Missouri). Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings. |
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#4
04-09-2003, 09:16 PM
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The tach can probably be recalibrated/readjusted or redesigned slightly. I've done it to factory GM tachs but not to an import yet. You would have to take it out of the dash & take it to a knowledgeable tach repair business. There are several mentioned in this BB and others.
Regards, George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum |
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#5
04-09-2003, 09:32 PM
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You can also make or buy a frequency divider circuit. I will look on some of the electronic sites tonight and see what I can find. Basically it turns the signal into digital, mathmatically divides it by 2 and then amplifys it back up.
 TigerEFI.com (Classic Pontiac Fuel Injection) [email protected] Motto: Build it for NASA and drive it like you stole it!
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 TigerEFI.com (Classic Pontiac Fuel Injection) 2004 GTO Company car, 1994 TA 25th Anv, 1971 Grand Safari Wagon, 1968 GTO EFI, 1968 GTO Stock, 1968 GTO Convertible in desperate need of restoration. |
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#6
04-10-2003, 10:05 PM
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Thanks for the thoughts. I like the idea of some kind of divider circuit a little better than disconnecting half the spark plugs lol. I thought about taking apart a cheap tach with a 4,6,8 cyl switch on it and trying to wire it into my circuit but my electrical knowledge is not as great as I wish it was. If anyone with the talent could help I'd be grateful.
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