Better than stock ECU for direct replacemnt hot street car?
#2718996
11/24/19 08:45 PM
11/24/19 08:45 PM
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Joined: Aug 2003
Posts: 43,204 Bend,OR USA
Cab_Burge
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Bend,OR USA
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I usually use MSD race ignition boxes on most of my Hi Pi street and strip cars but I'm hoping someone on here can recommend a good stock type 4 and 5 pin ECU for a stock type Mopar ignition system. I've heard that some of the stock after market units are better than the Mopar OEM units with higher unrestricted RPM limit and I've heard the opposite also I have several after market ECU, one from Accel is intermittent on wanting to start good so I replaced it with a stock Mopar black OEM unit and it starts right up but I've seen and heard that the stock ECU RPM are govern to run no higher than 6200 RPM, true or not? I'm getting ready to license a 1966 Dodge Coronet 2 door Coronet Deluxe 2 door sedan that I put a 440 and NP833 O.D. tranny in it so I don't want the ECU restricting the performance on this car Any recommendation on which brand and part # to use will be greatly appreciated
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Better than stock ECU for direct replacemnt hot street car?
[Re: Sniper]
#2719049
11/25/19 12:20 AM
11/25/19 12:20 AM
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Joined: Jan 2003
Posts: 32,937 Grand Prairie,Texas
stumpy
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I Win
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Most big block Mopars are out of the power band at that high an RPM unless they are built high performance engines.
Last edited by stumpy; 11/25/19 12:24 AM.
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Re: Better than stock ECU for direct replacemnt hot street car?
[Re: Cab_Burge]
#2719054
11/25/19 12:39 AM
11/25/19 12:39 AM
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Joined: Jan 2003
Posts: 3,122 Auburn WA
Dave_J
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The issue with most of the 40+ year old OEM is dwell scatter at higher RPM. The Orange box was a bit tighter and the Chrome was said to be best. A Gold box was said to be the ultimate but the one I bought for my car one of my sons 'Friends' needed it more than I did but didn't tell me it just came up missing one day. But in my opinion, on a 90% street/10% strip car, OEM works very well
Retired, US ARMY 1973-1994 ASE mechanic, Electrical 1994-1997 Retired GTE/VERIZON/FRONTIER 1997-2015
Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.
03 Suzuki Burgman 650(Burger King) Scooter 65 Formula S Cuda 78 Little Red Express Truck 98 Buick Regal (wifes car)
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Re: Better than stock ECU for direct replacemnt hot street car?
[Re: Dave_J]
#2719058
11/25/19 01:07 AM
11/25/19 01:07 AM
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Joined: Jan 2003
Posts: 20,796 A collage of whims
topside
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Posts: 20,796
A collage of whims
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Everyone that makes an aftermarket "high-performance" ECU claims great things, but I haven't the time or means to test them, wish someone would. One thing I've read from various sellers is that the orange box always pulls timing out at higher RPM, though I don't know if that's true. (If it is true, that may not even be bad, if you recall the concept of high-RPM retard...) Only recent experience experience with ECUs is a street car I bought with a Rev-N-Nator in it. With the vac advance hooked up, it'd rattle like mad at upper RPM or full throttle under load. Sure enough, when I got the instructions from them, they said disconnect/plug VA, set max timing at 36 and go. I'm still of the opinion that more VA than that under cruise/light throttle is a good thing (obviously not detonating). I swapped the Rev-N-Nator for a Standard LX101, re-connected the VA, runs the same (if not better) and no detonation.
On the last few hot street/strip deals, I've used an MP dist, FBO plate or limited slots, MSD6, and F150 coil and they've all run great, lit off quickly, no detonation.
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Re: Better than stock ECU for direct replacemnt hot street car?
[Re: Sniper]
#2719071
11/25/19 03:38 AM
11/25/19 03:38 AM
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Joined: Aug 2003
Posts: 43,204 Bend,OR USA
Cab_Burge
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[quote=Sniper]Are you planning to spin it up to 6200 rpm or more? Doesn't seem so with an OD trans.[ /quote]This motor is a little better than stock 3.91 stroke, bigger than stock factory cam, a set of Herb Mc Candless 452 ported big valve heads, RAS 1.6 rocker arms,, Eddy Performer RPM with a later model (List 4781-7) Holley 850 DP , 2.0 headers with a full 3.0 exhaust system to the rear bumper. typical fun street and cruise build, I hope I'm expecting a little bit above 520HP at or above 5900 RPM hence I don't want he ECU to limit the upper RPM below 7000 RPM I'm thinking it will stop pulling hard around 5800 to 6400 RPM so when it tongue comes out it is time for me to shift it Thanks to all of you for the help
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Better than stock ECU for direct replacemnt hot street car?
[Re: Cab_Burge]
#2719075
11/25/19 06:37 AM
11/25/19 06:37 AM
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Joined: Aug 2007
Posts: 6,095 Valencia, España
NachoRT74
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Valencia, España
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just one word ( if we can say like that ): Rev-N-Nator http://rev-n-nator.com/index.htmlon the replacement for the standard LX101 topside had to made, I'm having detonations issues too with the Rev-N-Nator installed but I think it comes from another area such as incorrect quench ( I'm over 10:1 CR with iron heads ), because once I installed the one being sold by Rick Erehnberg on ebay ( Hi-Rev 7500 ) and got the same. That could be another option on the cheap? but a friend of mine got one and failed after 3 months. I have it as spare. In the past I was plenty Happy with the A688 FBO unit but just last long around 6 months. That one replaced the Chromed MP, which I got failed 3 in a row in two years. ( Transistor is the culprit ). Both of them got me a crispier spark than any other, but the Rev-N-Nator gets a smoother and faster aceleration curve.
Last edited by NachoRT74; 11/25/19 06:46 AM.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Better than stock ECU for direct replacemnt hot street car?
[Re: Jjs72D]
#2719127
11/25/19 11:59 AM
11/25/19 11:59 AM
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Joined: Sep 2003
Posts: 19,421 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
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I don't understand the term LX101 box. I have never seen one advertised with that name. that is the "Standard Ignition Products" part number. available at almost every parts store, rock auto, e-bag, amazon, and other places.
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Re: Better than stock ECU for direct replacemnt hot street car?
[Re: moparx]
#2719138
11/25/19 12:20 PM
11/25/19 12:20 PM
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Joined: Feb 2003
Posts: 2,810 Sobieski Wi
bee1971
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Sobieski Wi
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Rev N Nator parts have been back ordered and unavailable all year
1971 Dodge Charger Superbee 2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded Siberian Huskies
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Re: Better than stock ECU for direct replacemnt hot street car?
[Re: bee1971]
#2719245
11/25/19 05:35 PM
11/25/19 05:35 PM
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Joined: May 2019
Posts: 6,267 nowhere
Sniper
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Either FBO's HRR688or the Standard Motors LX101, which is what i use in my Mopars, generally. Though with the 51 I am converting it to electronic ignition using a /6 distributor, the 4 pin HEI and a Ford TFI coil. As an experiment,
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Re: Better than stock ECU for direct replacemnt hot street car?
[Re: Sniper]
#2719280
11/25/19 07:42 PM
11/25/19 07:42 PM
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Joined: Feb 2003
Posts: 2,810 Sobieski Wi
bee1971
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Sobieski Wi
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FBO some time ago
For your information the LX101 is made by SMP the same people who previously made our A688 ECU's for us. As of late 2010 they have sent all their manufacturing on these products to China or Mexico and can no longer produce this ECU in the USA to our spec. The old SMP LX101 was made in Kansas, when SMP bought out Borg Warner years ago the LX101 was superseded to the B/W unit which was built from low end imported components and the performance proved it.
1971 Dodge Charger Superbee 2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded Siberian Huskies
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Re: Better than stock ECU for direct replacemnt hot street car?
[Re: bee1971]
#2719310
11/25/19 09:04 PM
11/25/19 09:04 PM
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Joined: Jan 2003
Posts: 5,444 So Cal
Sinitro
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Each of the mentioned ECUs (Mopar & aftermarket) have a different timing latency... To find the right 1 takes some trial and error for setting initial timing and related distributor advance curve depending upon engine vacuum, carburetor, compression ratio, gears.. It is not just a plug & play, unfortunately today many mechanics or techs lack the experience and/or patience... Just my $0.02...
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Re: Better than stock ECU for direct replacemnt hot street car?
[Re: GregY]
#2719322
11/25/19 09:43 PM
11/25/19 09:43 PM
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Joined: Jan 2003
Posts: 6,497 N.E. Ohio
KillerBee
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N.E. Ohio
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After having some distributor and ignition issues wit the wife's 440 Six Pack Challenger I went with FBO's ECU with RPM limiter, tuned distributor and coil setup. Not a high RPM race car but a good running street cruiser. The car has run perfectly for the last 3 years. I also like the ability to bypass the ballast resistor.
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Re: Better than stock ECU for direct replacemnt hot street car?
[Re: KillerBee]
#2719347
11/25/19 11:43 PM
11/25/19 11:43 PM
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Joined: Dec 2003
Posts: 3,519 Lansing, MI
70gtx440dana
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How about a good ol' AC Delco unit: LinkLink 2
70 Road Runner 383-4 4 speed FJ5 & black guts 70 Charger R/T 440-4 4 speed FJ5 & white guts
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Re: Better than stock ECU for direct replacemnt hot street car?
[Re: GregY]
#2719657
11/27/19 08:59 AM
11/27/19 08:59 AM
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Joined: Aug 2007
Posts: 6,095 Valencia, España
NachoRT74
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Valencia, España
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Has anyone tried the Jegs blue ignition control unit?: https://www.jegs.com/i/JEGS/555/40805/10002/-1I am considering it, but I don't need 7,500 rpm either. I might just go with the LX101 for my car, which won't see over 5,500 rpm. that's the one I mentioned being sold initially by Ricks Erehnbergs on ebay ( HiRev-7500 ) it responded very well on my car for the week I got it while I was waiting for the Rev-N-Nator to be delivered and now is my trunk spare. BUT a friend of mine got it to his Dart and failed after 3 or 4 months.
Last edited by NachoRT74; 11/27/19 09:00 AM.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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