SR3 Specific Discussions - Radical Sportscar Registry Forum

Radical Cup standard/recommended spec

surethingpartner — Tue, 28 Jul 2026 13:39:56 +0000

Can anyone that races or is involved with Radical Cup share their build spec for the XXR 1500? Or recommendations? Some things seem pretty standard like carbon center seat and the race pack, but are people running the AP brakes upgrade, quiet exhaust, etc?

Brake pads

Josh Spray — Sun, 01 Mar 2026 07:34:47 +0000

I was on wilwoods site for nearly 2 hours trying to find brake pads to buy and got nowhere! The part numbers on the calipers are not even listed on their site?! Perhaps radical specific calipers?

Can someone please give me a suggestion on where to buy brake pads for hese calipers?

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warning light wt high even when engine cold ?

Nicolas ch — Mon, 24 Nov 2025 17:51:53 +0000

Hello im working and discovering my rs3 2003 1300 and even if the engine is totally cold I have the alert on dash "wt high"

i suspected the temp sensor but even unplugged or shunted its same. can you help me ? too i fond near the passenger foots an ecu partially wired ?

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GDU refresh/service interval

Frank Gillett — Mon, 11 Aug 2025 11:23:57 +0000

Hi, I'm looking at purchasing a SR3 RS, can anyone advise me of the recommended interval for refreshing/service/ rebuild of the GDU.

Many thanks

2009 SR3 not cranking

Michael Nacarato — Mon, 07 Jul 2025 01:09:28 +0000

Good evening everyone. I have run into a bit of trouble with my SR3. I had it out at the track last weekend. Started the car, backed it out under its own power and let it warm up. When getting into it for my first session out it would not crank at all. I started digging around and found the positive and negative terminals on the battery seemed to have broken off in the battery and we're causing voltage to drop out. I thought they were loose but I tried to tighten them with a socket and they just spun indefinitely. I replaced the battery and I still had the same issue where I would hit the start button and you can hear everything click but it would not crank. I thought the next thing would be the starter, I just put a brand new starter in it and it is doing the same thing again. It Powers up fine. Builds air pressure ignition is on and when I go to hit the black start button you just hear a loud click and nothing happens. If anybody has any suggestions as to where I need to look next please let me know. I am new to this platform and still trying to learn and really bummed out that I missed my first track day.

Michael

No first gear thus no neutral

Josh Spray — Sun, 06 Jul 2025 02:40:04 +0000

My Radical has a1340 engine with manual shift..

And after my last track day I can't get neutral if my life depended on it.

I think I've determined that it can shift 2-3-4-5-6 then down 6-5-4-3-2 but not into 1st and that's why I can't get neutral.

Thoughts?

Overheated starter?

Gordon513 — Sun, 01 Jun 2025 22:26:20 +0000

2010 SR3 RS; New starter with less than 20 starts on it. Twin battery set up. 12.8 volts showing. When cold it turns the motor (although maybe not as fast or robustly as the old one) and it starts. When hot the starter motor whines and won't turn the motor over. Wait for it to thoroughly cool and we are good to go again. Any ideas other than just a bum starter?

Electronic reverse

Josh Spray — Thu, 13 Mar 2025 05:50:24 +0000

I got sick and tired of the cable never really working well.

I will make some labels for each button but for now the far right (#4) button I push for 5 seconds and reverse gear happens. Button to the left (#3) for forward gear.

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Clear tail light lenses for SR3 RS (2011)

Dave Fellows — Tue, 04 Mar 2025 06:23:31 +0000

Hey everyone, I've just purchased an SR3 RS 2011 here in NZ, very excited to say the least!
Looking to get the car tidied up a bit. Wondering if anyone knows where you can find clear lenses for the rear lights?

Thanks!
Dave

GDU cover gasket

Josh Spray — Sat, 01 Feb 2025 04:27:51 +0000

Is the GDU cover gasket re-usable? If so how many times until recommended to be changed?