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Ohlins Type HAL
Anyone have any experience with these Ohlins DFV Type HAL coilovers from rhdjapan.com?
I reached out to Ohlins USA and was told the difference from Road and Track coilovers from US retailers is that they're essentially pieced together from the vendor and NOT backed by Ohlins warranty. Any opinions on these? Is it worth saving the $600 to lose the warranty? https://cimg8.ibsrv.net/gimg/www.rx7...cd8a1658d0.jpg |
Look at it this way, if they tried to upsell you for a $600 'protection plan' on the regular dfv's would you bite?
Id definitely take the $600 off deal LOL (im running ohlins dfv's, they are amazing) |
True, I suppose the $600 saved would cover rebuilding a set if it ever came down to it.
Originally Posted by Oppai
(Post 12611843)
Look at it this way, if they tried to upsell you for a $600 'protection plan' on the regular dfv's would you bite?
Id definitely take the $600 off deal LOL (im running ohlins dfv's, they are amazing) |
Consider the spring rates being used and what other differences there might be. Beyond that, I got nothing.
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Looks very similar to the kit offered by Sake Bomb Garage, minus the Swift springs...
https://www.sakebombgarage.com/fpspo...er-kit-fd-rx7/ |
Did you ever end up getting these from RHDJapan?
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Originally Posted by SaiyanJin93
(Post 12615686)
Did you ever end up getting these from RHDJapan?
https://cimg5.ibsrv.net/gimg/www.rx7...e4acb3832d.jpg |
Would love to see these on your car when installed, I live just south of Boston and work in Quincy. The USD to YEN is favorable so the price has dropped about $100 good time to buy. Is that the Ohlins springs or Swift springs?
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Probably won't be installing until early next spring. If you're willing to wait I'd be happy to meet up once they're installed. I'd honestly jump on them while the markets good though, they occasionally have sales and promo codes you can add for a greater discount too.
I just got the ohlins springs, i believe theyre 11kg f/r
Originally Posted by SaiyanJin93
(Post 12615929)
Would love to see these on your car when installed, I live just south of Boston and work in Quincy. The USD to YEN is favorable so the price has dropped about $100 good time to buy. Is that the Ohlins springs or Swift springs?
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Originally Posted by skem
(Post 12615734)
Yes, they're beautiful and got em at a great price. I can answer any questions regarding part numbers and what's included.
Spoiler
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Thanks for sharing. Wondering have you gotten it installed and how did you feel about the 11/11 spring rate. Thanks.
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there is a reason Mazda delivered the FD with 26% less spring rate in the rear and another 12% motion ratio which further softens the rear in relation to the front. equal (F&R) rates turn the world beating road racing chassis into a drift configuration. according to Sakebomb, Ohlins needed the additional rate to keep the rear shock piston from bottoming... rear lack of travel. Sakebomb, on their own and to their credit, engineered a fix (longer rear stroke) and now offers a properly biased spring package. only avail thru SB. as long as you are not out to break track records you have a nice set of coil overs..
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Originally Posted by Howard Coleman CPR
(Post 12643046)
there is a reason Mazda delivered the FD with 26% less spring rate in the rear and another 12% motion ratio which further softens the rear in relation to the front. equal (F&R) rates turn the world beating road racing chassis into a drift configuration. according to Sakebomb, Ohlins needed the additional rate to keep the rear shock piston from bottoming... rear lack of travel. Sakebomb, on their own and to their credit, engineered a fix (longer rear stroke) and now offers a properly biased spring package. only avail thru SB. as long as you are not out to break track records you have a nice set of coil overs..
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"(due to the motion ratio) the rear wheel rates are softer than the front when using identical spring rates front and rear?"
yes, there is a longer lever arm in the rear in relation to the spring. one inch wheel movement in the front moves the spring .60 one inch wheel movement in the rear moves the spring .68. |
Originally Posted by Howard Coleman CPR
(Post 12643083)
"(due to the motion ratio) the rear wheel rates are softer than the front when using identical spring rates front and rear?"
yes, there is a longer lever arm in the rear in relation to the spring. one inch wheel movement in the front moves the spring .60 one inch wheel movement in the rear moves the spring .68. |
"your statements contradict themselves" yes. rear linkage V front works toward softening the effective rear rate spring rate.
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Definitely some crossed wires here because Howard's characterization of the effect is correct - equal spring rates F&R results in a higher bias towards oversteer.
But the explanation for why seems mixed up. The factory F&R wheel rates are nearly the same because the rear spring rate is lower. This means that the rear motio ratio of (.68) must yield a higher wheel rate in relation to the front motion ratio (.60), given a particular spring rate. If the spring rates were the same, it would introduce more oversteer bias because you end up with a wheel rate notably higher than the front. The math backs this up: Front: 10kg spring x (.6^2) = 3.6 wheel rate Rear-a: 8kg spring x (.68^2) = 3.69 wheel rate Rear-b: 10kg spring x (.68^2) = 4.62 wheel rate |
It's interesting, I always noticed that most of the Japanese tuner coilovers were same spring rates F/R, and generally very high. I ran a bunch of combos over the years starting with proportions similar to stock and then with a smaller and smaller gap percentage wise between F/R until I drove Fritz's car on track that had 14/14k Tein coilovers, and I just went with that (well, 800/800) ever since. It does make the car more lively.
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Originally Posted by Howard Coleman CPR
(Post 12643083)
"(due to the motion ratio) the rear wheel rates are softer than the front when using identical spring rates front and rear?" yes, there is a longer lever arm in the rear in relation to the spring. one inch wheel movement in the front moves the spring .60 one inch wheel movement in the rear moves the spring .68.
I measured the motion ratio of the FD and came up with similar numbers.
Originally Posted by cloud9
(Post 12643094)
This means that the rear motio ratio of (.68) must yield a higher wheel rate in relation to the front motion ratio (.60), given a particular spring rate. If the spring rates were the same, it would introduce more oversteer bias because you end up with a wheel rate notably higher than the front. The math backs this up:
Front: 10kg spring x (.6^2) = 3.6 wheel rate Rear-a: 8kg spring x (.68^2) = 3.69 wheel rate Rear-b: 10kg spring x (.68^2) = 4.62 wheel rate |
At the risk of being pedantic..
Originally Posted by Billj747
(Post 12643107)
To find the wheel rate, you need to multiply spring rate by motion ratio^2. With equal spring rates front and rear, the rear wheel rate will be
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Originally Posted by cloud9
(Post 12643136)
At the risk of being pedantic..
Stiffer. |
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