Megan Racing Coilovers

[Zmann42087]

It says that there is a 14kg spring in the front and a 6kg in the rear. It seems to me that this would make more weight transfer to the rear, would that make this suspension a bad idea for people with fwd?

I don't think anybody really answered this part of the question.. how would MR coilovers work on a 2g FWD? Anybody FWD guys have them? Will these spring rates work on a FWD car? Or will the weight transfer suck?

I'm looking for a good suspension to replace current setup (crappy non-adjustable Tokico HP shocks and Tein S-Tech springs with lower spring rates than stock). I'll be doing mostly autocrossing and occasional HPDE road racing.

 

[eclipsegsx1736]

I don't think anybody really answered this part of the question.. how would MR coilovers work on a 2g FWD? Anybody FWD guys have them? Will these spring rates work on a FWD car? Or will the weight transfer suck?

I'm looking for a good suspension to replace current setup (crappy non-adjustable Tokico HP shocks and Tein S-Tech springs with lower spring rates than stock). I'll be doing mostly autocrossing and occasional HPDE road racing.

The front/rear springrate difference isn't as far off as it seems. Due to the odd motion ratio of the front 2g suspension, especially compared to the rear, requires a stiffer spring rate at the front than you would think. If you were to calculate the wheel ratio of the front and rear suspension with these coilovers installed, the rates would be more even. Look up motion ratio and wheel ratio but it basically has to do with the leverage that the spring has to control the suspension at the wheel, and the front 2g suspension doesn't have as much leverage so in turn requires a stiffer rate.

I'm not sure exactly what you're asking as far as weight transfer. Based on what I said, along with the ~60/40 weight distribution of these cars the rates really aren't very unbalanced. Are you talking about weight transfer for drag racing and grip to the front wheels? Or weight transfer for road racing/autocross? These are very different. One weight transfer issue has alot to do with the car setup and suspension setup and another has to do with how the car is driven. IMO, this isn't a super ideal drag racing suspension as it's quite stiff and you won't have all that much weight transferring around in a straight line.

 

[Zmann42087]

The front/rear springrate difference isn't as far off as it seems. Due to the odd motion ratio of the front 2g suspension, especially compared to the rear, requires a stiffer spring rate at the front than you would think. If you were to calculate the wheel ratio of the front and rear suspension with these coilovers installed, the rates would be more even. Look up motion ratio and wheel ratio but it basically has to do with the leverage that the spring has to control the suspension at the wheel, and the front 2g suspension doesn't have as much leverage so in turn requires a stiffer rate.

I'm not sure exactly what you're asking as far as weight transfer. Based on what I said, along with the ~60/40 weight distribution of these cars the rates really aren't very unbalanced. Are you talking about weight transfer for drag racing and grip to the front wheels? Or weight transfer for road racing/autocross? These are very different. One weight transfer issue has alot to do with the car setup and suspension setup and another has to do with how the car is driven. IMO, this isn't a super ideal drag racing suspension as it's quite stiff and you won't have all that much weight transferring around in a straight line.

I was thinking more along the lines of autocrossing/road racing. I'm really not too familiar with the procedure for selecting spring rates, but just comparing the Megan Racing spring rates to those on other popular coilovers for our cars shows the MR coils with some extreme rates. Not necessarily higher spring rates but a bigger difference between the front/rear spring rates. For example, the JIC Magic FLT-A2 coilovers have spring rates of 8kg (front) and 7kg (rear). What made you decide to increase the rear spring rate on the MR coils from 6kg to 8kg?

 

[drivemusicnow]

First off, spring rates don't change weight transfer. That is a huge error to assume.

The megan racing coilovers seem a bit over sprung. If I had a 2g, and reading Jtoby's and Dennis grants setup work, I'd start with a 650F and 350rear and go from there.

 

[Zmann42087]

First off, spring rates don't change weight transfer. That is a huge error to assume.

The megan racing coilovers seem a bit over sprung. If I had a 2g, and reading Jtoby's and Dennis grants setup work, I'd start with a 650F and 350rear and go from there.

Your right, I read in the original post that spring rate affects weight transfer and assumed it was correct. My mistake.

650 lbs per inch works out to 11.6 kg per mm and similarly 350 lbs per inch is equal to 6.25 kg per mm. So in comparing them to the spring rates you posted, the MR coilovers do look slightly over sprung. If I end up getting these coilovers, I might have Megan drop the front spring rate from 14 kg to 12 kg.