Advice needed
Thread Starter
Instructor
Joined: Jun 2018
Posts: 111
Likes: 1
Advice needed
Calling all 84 Crossfire guys. I have just rebuilt my engine. Kept the TBI, installed 202 heads with 62cc combust, Renegade intake, Advertised Duration 250/260, Lift .432/.444 CAM. 180 thermo. What do I need to do to the computer (if anything) when I put the engine back in the car? Will it run on its own or do I need to tune or replace the ECM. If so what do I replace it with? I don't know much when it comes to the ECM and I keep getting mixed answers. Some tell me nothing needs done because the cam is mild and others say because its 202 heads it will completely screw up the ECM. I am looking for someone who has either done this before or someone who knows this car really well. Thank you. Also, I've already replaced the fuel pump with an 85 pump. Also did a smog delete.
Drifting
Joined: Jun 2018
Posts: 1,402
Likes: 287
From: Brisbane Australia
C4 of Year Finalist (performance mods) 2019
Calling all 84 Crossfire guys. I have just rebuilt my engine. Kept the TBI, installed 202 heads with 62cc combust, Renegade intake, Advertised Duration 250/260, Lift .432/.444 CAM. 180 thermo. What do I need to do to the computer (if anything) when I put the engine back in the car? Will it run on its own or do I need to tune or replace the ECM. If so what do I replace it with? I don't know much when it comes to the ECM and I keep getting mixed answers. Some tell me nothing needs done because the cam is mild and others say because its 202 heads it will completely screw up the ECM. I am looking for someone who has either done this before or someone who knows this car really well. Thank you. Also, I've already replaced the fuel pump with an 85 pump. Also did a smog delete.
Thread Starter
Instructor
Joined: Jun 2018
Posts: 111
Likes: 1
i think it will work ok with the stock ECM, if you want to tune it I would recommend getting a EBL flash II from Dynamic EFI. You can also get a HAM board from @Buccaneer which will allow your harness to plug straight in. Can I ask why you chose those heads?
Drifting
Joined: Jun 2018
Posts: 1,402
Likes: 287
From: Brisbane Australia
C4 of Year Finalist (performance mods) 2019
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
Heads are a good choice but you will not get anything out of them until you work on "breathing."
The choke point for any L83 is first the intake and then exhaust. You either need to get a Renegede intake or be prepared to port the sh*t out of your factory. The intake is robbing you of 35hp-- heads , cam or not. You need to ad a set of headers (long tube) and then a performance catalyst.
Bump the timing to 8-12 (depending on what you car likes) and then you are good to go. You ECM worry is meaningless until you make the above changes. Even then, your ECM is pretty forgiving.
The choke point for any L83 is first the intake and then exhaust. You either need to get a Renegede intake or be prepared to port the sh*t out of your factory. The intake is robbing you of 35hp-- heads , cam or not. You need to ad a set of headers (long tube) and then a performance catalyst.
Bump the timing to 8-12 (depending on what you car likes) and then you are good to go. You ECM worry is meaningless until you make the above changes. Even then, your ECM is pretty forgiving.
Drifting
Joined: Jun 2018
Posts: 1,402
Likes: 287
From: Brisbane Australia
C4 of Year Finalist (performance mods) 2019
Heads are a good choice but you will not get anything out of them until you work on "breathing."
The choke point for any L83 is first the intake and then exhaust. You either need to get a Renegede intake or be prepared to port the sh*t out of your factory. The intake is robbing you of 35hp-- heads , cam or not. You need to ad a set of headers (long tube) and then a performance catalyst.
Bump the timing to 8-12 (depending on what you car likes) and then you are good to go. You ECM worry is meaningless until you make the above changes. Even then, your ECM is pretty forgiving.
The choke point for any L83 is first the intake and then exhaust. You either need to get a Renegede intake or be prepared to port the sh*t out of your factory. The intake is robbing you of 35hp-- heads , cam or not. You need to ad a set of headers (long tube) and then a performance catalyst.
Bump the timing to 8-12 (depending on what you car likes) and then you are good to go. You ECM worry is meaningless until you make the above changes. Even then, your ECM is pretty forgiving.
Drifting
Joined: Jun 2018
Posts: 1,678
Likes: 229
From: Michigan
Calling all 84 Crossfire guys. I have just rebuilt my engine. Kept the TBI, installed 202 heads with 62cc combust, Renegade intake, Advertised Duration 250/260, Lift .432/.444 CAM. 180 thermo. What do I need to do to the computer (if anything) when I put the engine back in the car? Will it run on its own or do I need to tune or replace the ECM. If so what do I replace it with? I don't know much when it comes to the ECM and I keep getting mixed answers. Some tell me nothing needs done because the cam is mild and others say because its 202 heads it will completely screw up the ECM. I am looking for someone who has either done this before or someone who knows this car really well. Thank you. Also, I've already replaced the fuel pump with an 85 pump. Also did a smog delete.
IMO your best solution is: EBL - Dynami EFI. You don't need to do a lot to help that tune a lot. The EBL even helps with the VE tables.
Thread Starter
Instructor
Joined: Jun 2018
Posts: 111
Likes: 1
Heads are a good choice but you will not get anything out of them until you work on "breathing."
The choke point for any L83 is first the intake and then exhaust. You either need to get a Renegede intake or be prepared to port the sh*t out of your factory. The intake is robbing you of 35hp-- heads , cam or not. You need to ad a set of headers (long tube) and then a performance catalyst.
Bump the timing to 8-12 (depending on what you car likes) and then you are good to go. You ECM worry is meaningless until you make the above changes. Even then, your ECM is pretty forgiving.
The choke point for any L83 is first the intake and then exhaust. You either need to get a Renegede intake or be prepared to port the sh*t out of your factory. The intake is robbing you of 35hp-- heads , cam or not. You need to ad a set of headers (long tube) and then a performance catalyst.
Bump the timing to 8-12 (depending on what you car likes) and then you are good to go. You ECM worry is meaningless until you make the above changes. Even then, your ECM is pretty forgiving.
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