500 efi not making top end power

Reply Subscribe

Thread Tools

07-19-2022, 02:08 PM

#51

articfriends

Platinum Member

iTrader: (1)

Join Date: Jun 2004

Location: frankenmuth michigan

Posts: 7,141

Likes: 1,722

Received 817 Likes on 374 Posts

Quote:

Originally Posted by sutphen 30

all my ignition coil jumper have been truck harnesses,secure them up right and as my engines show,,they can go many years(16 now) w/o a problem.as far as ignition modules,ac delco 399's,work well,,I got a base tune w/ jacked up dwell times and burned out modules.I got real good and fast at changing them,even while going over a big azz Pershing wake in hyannis harbors channel.

Yep, the higher the rpm, the lower the dwell time needs to be to keep from cooking modules! the gm motorsports mefi4 harness I used to buy when they were a deal of the century comes with that coil connector and it has NO resistor in it like mercruiser does, I think the truck wire does, Ive gotten a few off junk vehicles thru the years. Whats your opinion of the inline resistor?

07-21-2022, 09:58 PM

#52

sutphen 30

Registered

Join Date: Jan 2006

Location: taxachusetts

Posts: 3,094

Likes: 537

Received 700 Likes on 354 Posts

my guess,its to limit the current to the module,not that I see a need for it nor did gm.

The following users liked this post:

articfriends (07-23-2022)

07-22-2022, 11:02 AM

#53

boostbros

Registered

Join Date: Nov 2003

Posts: 841

Likes: 4

Received 447 Likes on 245 Posts

i use a lot of these delco external coil ignitions its often not the modual if its a good modual is almost always the pick up coil you take the dist gear off and take the shaft out and the coil is right there its around 20 bucks try to use a good one as the cheap ones the wire connectors fail .........we use these because they idle with a lot of initial timing and that really smooths out an engine idling for 8-10 hrs everyday