Radical Sportscar Registry Forum - Recent Topics

Single seat for SR3 year 2007

Manuel Rey — Tue, 31 Mar 2026 11:35:25 +0000

Hello guys! I am looking for a single seat for my Radical SR3, i have the factory two seat, but it is really annoying when i turn right and my elbow hits the center part of the seat. For what i saw, there are factory single seats, or in last option, another factory two seat to buy. Thank you guys

2 pin round electrical 12 volt connector

Shawn Wentzel — Sun, 29 Mar 2026 20:17:27 +0000

I was wondering if someone had a source what these connectors are called. There are various of them on the car ( fuel pump out around the left rear, a few in the cockpit, ect)

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SR3 driveshafts

Josh Spray — Sat, 28 Mar 2026 21:55:21 +0000

Hey guys,

What details do we know about the SR3 driveshafts? Particulary the right side longer one. I need to re-build it from my mishap last year and the shaft is cocked and locked sideways in the CV joint so I am thinking something will need to be replaced.

Sr3 new owner

james manlove — Fri, 20 Mar 2026 20:05:32 +0000

Good evening all. I’m soon to be the extremely happy owner of sr3 chassis number 309. Any advice regarding setup and maintenance will be greatly appreciated

Alignment and shock settings for SR 10/ Intrax

James Mcgehee — Fri, 20 Mar 2026 13:09:34 +0000

Hello,

Struggling to find a good set up on a high speed Track like Road Atlanta. The car (2025 SR10 xxr) is only used only for HPDE and I’m running the Hankook tire.

The car just feels unsettled in the front under heavy braking and a little floaty at high speed.

If anyone has some shock and alignment that worked great for them at high speed tracks like this do you mind sharing them with me directly via PM (If you don’t want them public).

Thank you!

Correct safety wire placement.

Josh Spray — Sun, 08 Mar 2026 04:56:21 +0000

How do you guys run a safety wire on the upper heim joints? 4854

SR3 RSX charging issues

Rob Van Landingham — Sat, 07 Mar 2026 18:19:23 +0000

I have a 2018 SR3 RSX (1164). The car was fine last season, running in 7 weekend events. This year it has been one thing after another through three weekends at Sebring.

1) A persistent problem this season has been the battery not charging while running. I have replaced the battery, cleaned the connector from the engine stator to the wiring harness (and used the multimeter to check current at the connector from the stator). All the wiring and connectors from the stator, voltage regulator, rectifier and battery appear to be OK but I am seeing a low voltage warning and blue battery light on the AIM display while running (after a few laps). Where do I go from here? Any suggestions on what to replace next?

2) Is the large connector on the side pod for charging the battery? I have been charging the battery by removing the rear bodywork, removing the battery strap and cover, and connecting the charger direct to the battery terminals (after two 30 minute sessions). If so, is there a connector available for this function?

3) I really don't want to spend the big bucks for the Radical factory fuel drain system. Can I buy the fittings and make the setup myself? I did see the previous posting on this topic. I have run out of fuel twice on the track so need to measure fuel consumption much more accurately.

Thanks!

Rob

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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New member and new owner of an SR3 SL

Matt Stevenson — Fri, 13 Feb 2026 20:49:55 +0000

Hello everyone,
I'm Matt, A lot of good information on here so thought I'd join up, Already spoken to a few Radical owners here in the UK and they have been super helpful along the way.
I'm the owner of chassis #88, Gen1 yellow road legal supersport bought on pistonheads auctions last year with very poor wiring, blocked fuel pressure regulator, damaged plug leads and bodywork issues. Since then I've installed a forged 1300cc engine, C30-94 supercharger, suspension, new ECU, loom, renewed bushes bearings bolts etc.. I've got a gen2 RS bodywork (although I'm now thinking to go RSX bodywork)

Still a work in progress and lots left to do but hoping to have it finished for the summer.
looking forward to the first drive, then possibly look into something like hill climb or time attack in the near future.

Cheers,

Engine fitment problem

Gordon513 — Sat, 07 Feb 2026 20:55:20 +0000

My first time swapping out the motor in my SR3 RS. (This is different RPE motor, not a rebuild of the original). Everything fits together fine: cradle studs all go in (with the spacers), GDU coupler fits right, and 5 of the 6 upper triangular brace bolts to the head fit

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right, but the 6th pictured here isn't even close. I drilled it out a bit for a bit more allowable play, but it isn't close. All fit fine with previous motor. Anyone else run into this? Big problem if we just leave it at 5 out of 6? I don't want to make custom triangular fitting.