Chrome ECU ? is it or not? or buy HIREV 7500 - Moparts Forums

Register Log In Moparts Forums Unlawfl's Race & Engine Tech Chrome ECU ? is it or not? or buy HIREV 7500

Print Thread

Page 1 of 2

1

2

Chrome ECU ? is it or not? or buy HIREV 7500 #1253860 06/19/12 02:51 PM 06/19/12 02:51 PM
Joined: Oct 2004 Posts: 1,946 Connecticut 5126brl No more OP top fuel
5126brl No more OP top fuel Joined: Oct 2004 Posts: 1,946 Connecticut	Is this a Chrome race ECU or just a factory ECU ? No part numbers on it,has 4 pins, Trying to get info. thinking it may be a 1978 red express truck box. Chrysler decal looks odd for race unit? Thanks 7256542-P1010049.JPG (432 downloads) Last edited by 4406brl; 06/20/12 04:20 PM.

Re: Chrome ECU ? is it or not? [Re: 5126brl No more] #1253861 06/19/12 03:57 PM 06/19/12 03:57 PM
Joined: Jan 2003 Posts: 1,812 Portsmouth, VA D DusterW2 top fuel
DusterW2 top fuel D Joined: Jan 2003 Posts: 1,812 Portsmouth, VA	I don't see any picture attached, but the Mopar Race Chrome ECU has a black heat sink. A plain old low performance chrome ECU may have a blue or gold heat sink. John

Re: Chrome ECU ? is it or not? [Re: DusterW2] #1253862 06/19/12 04:15 PM 06/19/12 04:15 PM
Joined: Oct 2004 Posts: 1,946 Connecticut 5126brl No more OP top fuel
5126brl No more OP top fuel Joined: Oct 2004 Posts: 1,946 Connecticut	OH So a picture would make it easy! Thanks Also trying to find out what I should have for voltage at the coil + Last edited by 4406brl; 06/19/12 04:16 PM.

Re: Chrome ECU ? is it or not? [Re: 5126brl No more] #1253863 06/19/12 04:32 PM 06/19/12 04:32 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	It looks like the chrome box unless its a knock off... the voltage at the coil is reduced going through the ballast... I dont recall the voltage off hand but I think its 8 volt... maybe some one can answer that

Re: Chrome ECU ? is it or not? [Re: MR_P_BODY] #1253864 06/19/12 04:47 PM 06/19/12 04:47 PM
Joined: Oct 2004 Posts: 1,946 Connecticut 5126brl No more OP top fuel
5126brl No more OP top fuel Joined: Oct 2004 Posts: 1,946 Connecticut	Thanks, I have a .25 ohm ballast and have about 9 volts now before had 1.5 ohm and had 6.3 volts.

Re: Chrome ECU ? is it or not? [Re: 5126brl No more] #1253865 06/19/12 04:54 PM 06/19/12 04:54 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Thanks, I have a .25 ohm ballast and have about 9 volts now before had 1.5 ohm and had 6.3 volts. If I remember right the .25 ohm is for the gold box but not sure if its needed for the chrome(I just dont remember) EDIT Looking at my parts book its just needed if you run the P3690560, P4876832, P4876833 coil... it will work with any box other than the orange box and production box Last edited by MR_P_BODY; 06/19/12 05:06 PM.

Re: Chrome ECU ? is it or not? [Re: 5126brl No more] #1253866 06/19/12 05:38 PM 06/19/12 05:38 PM
Joined: Apr 2003 Posts: 1,634 anywhere@ anytime A actionange top fuel
actionange top fuel A Joined: Apr 2003 Posts: 1,634 anywhere@ anytime	Quote: Is this a Chrome race ECU or just a factory ECU ? No part numbers on it,has 4 pins, Trying to get info. thinking it may be a 1978 red express truck box. Chrysler decal looks odd for race unit? Thanks "Race" ECU's all had 5 pins with one not used. I never saw one-chrome or gold with any decal on it.

Re: Chrome ECU ? is it or not? [Re: actionange] #1253867 06/19/12 05:48 PM 06/19/12 05:48 PM
Joined: Dec 2005 Posts: 1,495 Shelby mi. J JAKE68 pro stock
JAKE68 pro stock J Joined: Dec 2005 Posts: 1,495 Shelby mi.	That is not the race box. It is a chrome replacement box. JAKES AUTOMOTIVE

Re: Chrome ECU ? is it or not? [Re: JAKE68] #1253868 06/19/12 06:11 PM 06/19/12 06:11 PM
Joined: Oct 2004 Posts: 1,946 Connecticut 5126brl No more OP top fuel
5126brl No more OP top fuel Joined: Oct 2004 Posts: 1,946 Connecticut	Wow! If it is a stock box it's been on there 30 years I have gone 10.99 at 124 with that box!! I could have been quicker with a race box!! Last edited by 4406brl; 06/19/12 06:18 PM.

Re: Chrome ECU ? is it or not? [Re: actionange] #1253869 06/19/12 06:40 PM 06/19/12 06:40 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Quote: Is this a Chrome race ECU or just a factory ECU ? No part numbers on it,has 4 pins, Trying to get info. thinking it may be a 1978 red express truck box. Chrysler decal looks odd for race unit? Thanks "Race" ECU's all had 5 pins with one not used. I never saw one-chrome or gold with any decal on it. I forgot all about the 5 pins

Re: Chrome ECU ? is it or not? [Re: actionange] #1253870 06/19/12 07:47 PM 06/19/12 07:47 PM
Joined: Mar 2007 Posts: 3,300 Northern Indiana Dunnuck Racing master
Dunnuck Racing master Joined: Mar 2007 Posts: 3,300 Northern Indiana	"Race" ECU's all had 5 pins with one not used. I never saw one-chrome or gold with any decal on it. Nope,....here is a MP chrome,FBO,and a Rev N Nator. I have two chromes and two orange boxes that all have 4 pins. The harnesses all have 5 wires for the early 5 wire boxes but leave the 5th wire unattatched. Keith 7256927-004(800x600).jpg (416 downloads) www.dunnuckracing.com

Re: Chrome ECU ? is it or not? [Re: 5126brl No more] #1253871 06/20/12 02:04 AM 06/20/12 02:04 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	Quote: Wow! If it is a stock box it's been on there 30 years I have gone 10.99 at 124 with that box!! I could have been quicker with a race box!! Thats cool but I have been 10.70's with the orange MP box. Ron

Re: Chrome ECU ? is it or not? [Re: Dunnuck Racing] #1253872 06/20/12 06:24 AM 06/20/12 06:24 AM
Joined: Jun 2003 Posts: 3,325 Truckville, the capital of NY 85_Ram_4speed master
85_Ram_4speed master Joined: Jun 2003 Posts: 3,325 Truckville, the capital of NY	I believe the 5-pin boxes were for prodution when they went to the dual side ballast. I had orange and gold boxes that were only 4-pin. Al my regular production boxes are 5-pin. But as always with Ma Mopar, never say never--there always seems to be exceptions to the rules. Outcast Dodge guy.

Re: Chrome ECU ? is it or not? [Re: Dunnuck Racing] #1253873 06/20/12 07:39 AM 06/20/12 07:39 AM
Joined: Jan 2003 Posts: 3,575 The Netherlands BigBlockMopar master
BigBlockMopar master Joined: Jan 2003 Posts: 3,575 The Netherlands	Quote: Nope,....here is a MP chrome,FBO,and a Rev N Nator. I have two chromes and two orange boxes that all have 4 pins. The harnesses all have 5 wires for the early 5 wire boxes but leave the 5th wire unattatched. Keith I think I see a dyno setup in the pic. Did you do a comparison with the boxes? If you did, what did you find? BigBlockMopar.com

Re: Chrome ECU ? is it or not? [Re: 5126brl No more] #1253874 06/20/12 08:19 AM 06/20/12 08:19 AM
Joined: Mar 2005 Posts: 1,406 New Jersey, USA Y yella71 pro stock
yella71 pro stock Y Joined: Mar 2005 Posts: 1,406 New Jersey, USA	As far as I can tell a ecu is an ecu. the one in my car has nothing at all on it to identify it. It goes to 7000 rpm no problem. Ive used many "stock" ecus with the same results. 71 challenger convertable, 64 sport fury 383 ci with factory air 99 sebring convertable 89 CTD pup

Re: Chrome ECU ? is it or not? [Re: BigBlockMopar] #1253875 06/20/12 08:34 AM 06/20/12 08:34 AM
Joined: Apr 2007 Posts: 2,826 NY usa 5 540challenger master
540challenger master 5 Joined: Apr 2007 Posts: 2,826 NY usa	Quote: Quote: Nope,....here is a MP chrome,FBO,and a Rev N Nator. I have two chromes and two orange boxes that all have 4 pins. The harnesses all have 5 wires for the early 5 wire boxes but leave the 5th wire unattatched. Keith I think I see a dyno setup in the pic. Did you do a comparison with the boxes? If you did, what did you find? He compared a few different systems I think his results start on page 3 https://board.moparts.org/ubbthreads/show...e=0#Post6927491

Re: Chrome ECU ? is it or not? [Re: 540challenger] #1253876 06/20/12 10:27 AM 06/20/12 10:27 AM
Joined: Mar 2007 Posts: 3,300 Northern Indiana Dunnuck Racing master
Dunnuck Racing master Joined: Mar 2007 Posts: 3,300 Northern Indiana	Yes, I have done tons of testing with several boxes. The earlier made Orange box(before people had issues with them) runs pretty similar to the current Chrome boxes. I have a few different stock replacement boxes,one that will pull high rpm's. But it gave up a bunch of power through the mid range. When a engine reaches it torque peak,the cylinder pressure can make it really hard to light off a mixture. If the ignition is not strong enough,it loses power. I ahve learned more about Mopar boxes than I ever thought I would want to know. I used to run them on bracket cars and always thought if you had a decent spark and set your total timing,there was nothing to be gained. The more I learn,the more I realize that old theories are just that,old theroies. Keith www.dunnuckracing.com

Re: Chrome ECU ? is it or not? Hirev 7500 ? [Re: Dunnuck Racing] #1253877 06/20/12 04:19 PM 06/20/12 04:19 PM
Joined: Oct 2004 Posts: 1,946 Connecticut 5126brl No more OP top fuel
5126brl No more OP top fuel Joined: Oct 2004 Posts: 1,946 Connecticut	So it looks like this may be a stock unit Since I will need a new one what has anyone heard about HIREV7500 that RicH E. is selling on ebay?

Re: Chrome ECU ? is it or not? Hirev 7500 ? [Re: 5126brl No more] #1253878 06/20/12 10:04 PM 06/20/12 10:04 PM
Joined: Mar 2007 Posts: 3,300 Northern Indiana Dunnuck Racing master
Dunnuck Racing master Joined: Mar 2007 Posts: 3,300 Northern Indiana	I was just over on ebay looking at them. Not much info but they have a hirev and a hirev 7500. They look like a LX100 and LX101,respectively. That is purely heresay on my part,but several guys like the Standard ignition stuff. Keith www.dunnuckracing.com

Re: Chrome ECU ? is it or not? or buy HIREV 7500 [Re: 5126brl No more] #1253879 06/23/12 08:59 AM 06/23/12 08:59 AM
Joined: Jun 2010 Posts: 57 CT 4 440Kilmartin member
440Kilmartin member 4 Joined: Jun 2010 Posts: 57 CT	Maybe if you put in MSD your car will go 9's

Page 1 of 2

1

2

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1