Does anyone know what the factory spring rates are for the AVO's and/or InTrax units on a 2nd gen RS? There might be something written on the end of at least one of my springs but I need to disassemble it to read it. Whatever I may have on the car now I am also interested in knowing the baseline spec as I look to replace my dampers and springs.
I have one report that the InTrax comes with 450F / 550R but wanted to reach out to a broader group. I did not see much with a forum search either.
I see the handbook now and its showing 450F / 550R. I always forget to look in the official docs before I look here!
@walteriv ... I know that's what the RS Manual says.... but if your car has the high downforce aero kit, then I can almost guarantee it will be way too soft. I have a friend (@danh who sometimes looks at the forum) who has a very old SR3 chassis (Chassis #47 from the early 2000's!... not sure why Charley hasn't got it in his Registry - I know Dan sent the info through?)) but with the high downforce aero upgrades. His car was supplied with those springs you mentioned... and it would rub at both ends of the car at the end of the straight (the splitter into the ground and the rear bodywork onto the rear tires)... it was a mess!
In the absence of any better advice, we set it up with the same 'baseline' settings as my RSX (110N/mm front and 100N/mm rear or 630 inch.pounds front and 570 inch.pounds rear)
His car is on AVO's ... my car was on Intrax's
Once we made those changes, stiffened the front splitter by 100% and set the chassis heights correctly he never looked back - car has been a bullet.
Maybe it will at least help to know that if your car does 'ground-out' that your not the only one to have experienced that issue.
Rod
@rjbender you're awesome. Very interesting!
I disassembled my units this afternoon. Hand written values (that have mostly worn off) on the springs seem to indicate 500F / 550R. This is a little closer to the stiffer setup you mention. I thought the car was decent and it was not grounding out for sure.
I downloaded the RSX guide indicating the 110(628)F / 95(542)R. What intrigues me about that most is the heavier springs in the front vs the rear. Seems like this config is sprung for a lot more front aero vs absolute weight. I do have the high down-force body, currently with dual dive planes.
I realise I am late to this discussion but so many older discussions on this forum are still invaluable. The rear spring on our RSX intrax units says "100-95". When I research this unit some sources say this means 100 N/mm front and 95 N/mm rear, but it's just a spring isnt it? With an inherent spring rate? So we are a bit confused and any help appreciated as we want a slightly softer spring and arent even sure what spring to order! (The RSX parts catalogue looks down for suspension at present but anyway had different springs available to the XX which seems also odd)
@jpvintage62 ... the "100-95" is the Intrax code for a 100mm long spring with a spring rate of 95N/mm... refer link below from Intrax
All springs used on SR3's are 100mm long as far as I'm aware....
https://www.intraxracing.nl/en/wp-content/uploads/sites/2/2023/09/SCHROEFSET-VEREN-2023.pdf
