R53 JCW Custom Tune Question
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2nd Gear
Joined: Feb 2018
Posts: 72
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From: Titusville, FL
R53 JCW Custom Tune Question
A year ago I purchased a 2003 R53 w/ JCW add-on package. I’ve made a few upgrades and about to put it back together... my question is wether or not the 2003 came with a JCW custom tune? And wether or not I should spend the money to get a custom tune or find someone that has a 2006 program I can flash to the ECU? I have access to a “My Genius Dimsport” This car is a fun daily driver... 
I’ve added to the JCW package.
15% Pulley
CAI
WMW Mild Street Cam
Blue 380 injectors
Mine didn’t come with the JCW certificate but it had the JCW badging, JCW exhaust, JCW valve cover.. NO JCW airbox, fuel injectors, or brakes. I always question wether or not it’s a real JWC because it’s hard to know for sure without the certification.... I recently had the head off but didn’t know what to look for to know if it was legit.. so who knows if it came with a JCW tune even if it was suppose to...
I’ve added to the JCW package.
15% Pulley
CAI
WMW Mild Street Cam
Blue 380 injectors
Mine didn’t come with the JCW certificate but it had the JCW badging, JCW exhaust, JCW valve cover.. NO JCW airbox, fuel injectors, or brakes. I always question wether or not it’s a real JWC because it’s hard to know for sure without the certification.... I recently had the head off but didn’t know what to look for to know if it was legit.. so who knows if it came with a JCW tune even if it was suppose to...
OVERDRIVE
Joined: Mar 2013
Posts: 5,489
Likes: 629
From: Fuquay Varina, NC
I am thinking the airbox was an 05 thing.
I don't know the grind of the cam you have but I have RMW's Dominator Cam, 450 injectors and Jan's tune along with Way's 2% overdrive crank pulley. You put on a 421 header along with a Tune from RMW and your grin will be more than a little larger. The downside is that you will have more torque steer as you don't have the LSD.
I don't know the grind of the cam you have but I have RMW's Dominator Cam, 450 injectors and Jan's tune along with Way's 2% overdrive crank pulley. You put on a 421 header along with a Tune from RMW and your grin will be more than a little larger. The downside is that you will have more torque steer as you don't have the LSD.
It should have come with the 200hp JCW tune. If the dealer did things correctly, and it lasted all these years, there should be a sticker somewhere on the ECU by the airbox.
The hard part to verify on your car will be the JCW head. You'll need access to the exhaust ports to measure them. If you have some pics of the exhaust ports while the head was off you should be able to tell. For the super charger you could measure the pulley you removed to determine if you have a JCW teflon coated s/c.
The 210hp JCW package included the blue 380cc injectors, the JCW airbox, and updated tune for these extra items. JCW brakes were a separate package from the dealer add on kits.
With your Dimsport you should be able to get a canned tune or a remote custom tune while on the dyno. Just make sure the Dimsport isn't already locked to another car.
The hard part to verify on your car will be the JCW head. You'll need access to the exhaust ports to measure them. If you have some pics of the exhaust ports while the head was off you should be able to tell. For the super charger you could measure the pulley you removed to determine if you have a JCW teflon coated s/c.
The 210hp JCW package included the blue 380cc injectors, the JCW airbox, and updated tune for these extra items. JCW brakes were a separate package from the dealer add on kits.
With your Dimsport you should be able to get a canned tune or a remote custom tune while on the dyno. Just make sure the Dimsport isn't already locked to another car.
Thread Starter
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2nd Gear
Joined: Feb 2018
Posts: 72
Likes: 5
From: Titusville, FL
It should have come with the 200hp JCW tune. If the dealer did things correctly, and it lasted all these years, there should be a sticker somewhere on the ECU by the airbox.
The hard part to verify on your car will be the JCW head. You'll need access to the exhaust ports to measure them. If you have some pics of the exhaust ports while the head was off you should be able to tell. For the super charger you could measure the pulley you removed to determine if you have a JCW teflon coated s/c.
The 210hp JCW package included the blue 380cc injectors, the JCW airbox, and updated tune for these extra items. JCW brakes were a separate package from the dealer add on kits.
With your Dimsport you should be able to get a canned tune or a remote custom tune while on the dyno. Just make sure the Dimsport isn't already locked to another car.
The hard part to verify on your car will be the JCW head. You'll need access to the exhaust ports to measure them. If you have some pics of the exhaust ports while the head was off you should be able to tell. For the super charger you could measure the pulley you removed to determine if you have a JCW teflon coated s/c.
The 210hp JCW package included the blue 380cc injectors, the JCW airbox, and updated tune for these extra items. JCW brakes were a separate package from the dealer add on kits.
With your Dimsport you should be able to get a canned tune or a remote custom tune while on the dyno. Just make sure the Dimsport isn't already locked to another car.
just looked..and YES... my ECU has a JCW Tuning sticker on it.
I just put my head back on and all the pics I took were from the front. I remember the exhaust ports being smooth... the intake side still had rough cast marks... not sure if that is characteristic of the JCW head?
the dimsport was used to tune my brothers 2003 R53 Mini. He did similar stuff that I did but with a more aggressive cam and header... he no longer has the car but still has the tool.
The JCW exhaust ports are noticeably taller from the regular head, but if the exhaust ports were smooth, it's probably the JCW head. Can you post a pic of the front of the head? There supposedly was a red or green dot painted on the head by the casting number when new. It would be interesting to see if your head has one of these.
I would check with Jan at RMW or Way at Way Motor Works, but the Dimsport is normally locked to one VIN and costs about $200-250 to reset them. Not bad for you since yours was probably free, but bad for the people who unknowingly buy used ones for a "deal", then end up paying more than new after the reset.
I would check with Jan at RMW or Way at Way Motor Works, but the Dimsport is normally locked to one VIN and costs about $200-250 to reset them. Not bad for you since yours was probably free, but bad for the people who unknowingly buy used ones for a "deal", then end up paying more than new after the reset.
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2nd Gear
Joined: Feb 2018
Posts: 72
Likes: 5
From: Titusville, FL
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Thread Starter
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2nd Gear
Joined: Feb 2018
Posts: 72
Likes: 5
From: Titusville, FL
The JCW exhaust ports are noticeably taller from the regular head, but if the exhaust ports were smooth, it's probably the JCW head. Can you post a pic of the front of the head? There supposedly was a red or green dot painted on the head by the casting number when new. It would be interesting to see if your head has one of these.
Probably got cleaned off after all those years, but I think the round casting mark is what was painted. You can barely see it below the last digits “AB” on the left side of the head. The short casting line at an angle is right in the middle of the dot.
Thread Starter
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2nd Gear
Joined: Feb 2018
Posts: 72
Likes: 5
From: Titusville, FL
Did SC maintenance while I was in there too.. Every gasket/seal that came off is being replaced including thermostat.
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