RPM Extenders/chips

[83 Capri 5.0]

On a stock 5.0 EFI with exhaust, pulleys, CAI, I'm looking into raising my rev limit to 6500 and possibly adjust air/fuel at WOT to accomodate my next bunch of mods which include ported GT40 heads and a ported Explorer Intake Crane 2040 cam 1.7 Rockers. Thought I had it nailed with the SVO EEC-IV Rev Extender but they not available any more.

Any suggestions on what would be a good and not too expensive way to go?

 

[IndyBlk5.0]

Bad idea to do that to a stock engine... They put those there for a reason. Your stock springs cant handle that much rpm...

 

[83 Capri 5.0]

Bad idea to do that to a stock engine... They put those there for a reason. Your stock springs cant handle that much rpm...

Sorry, should have been more specific. New crane springs with the 2040 cam, 1.7 rockers with heavily port GT 40 heads with 3 angle VJ. Ported Explorer intake, 65mm TB, JBA 1 5/8 shortie headers, 2 1/2 exhaust with Xpipe, Jacobs Pro Street ignition & Ultra Coil.

The SVO extender was recommended for my set up but is no longer available, wondering what everyone else is using, I hear JMS is one of the best for chips.

 

[Michael Yount]

Even with those mods, there probably won't be any need to have the rev limit above the factory 6250. With that cam, it's doubtful you'll see a power peak much above 5600 rpm. Nonetheless, there are other reasons to use a chip - idle speed adjustment will likely be necessary with that cam, and changing the timing curve will help a bunch. The only thing I'd recommend is to find someone to burn the chip for you where you can actually take your car to them. That way you can drive it a bit and make adjustments. Ideal situation is to have it done in conjuction with dyno runs and a/f ratio measurement. I wouldn't do a mail order chip.