Redline360 Mishimoto Radiators

Spring Rate Conversion Chart – Easily Convert KG/mm to LBS/in

Many of our customers are looking to buy coilovers or lowering springs for their car. Half of the manufacturers show their spring rates as kg/mm while others show them as lbs/in. It's easy to forget what the conversion is so we put together a quick and easy chart to use for reference.

Roughly 1 KG/mm is equal to 55.997 LBS/in. Easy way to remember is 1 KG/mm = 56 LBS/in.

Here's a few quick charts:

700 lb/in = 12.5 kg/mm
650 lb/in = 11.6 kg/mm
600 lb/in = 10.7 kg/mm
550 lb/in = 9.8 kg/mm
500 lb/in = 8.9 kg/mm
450 lb/in = 8 kg/mm
400 lb/in = 7.1 kg/mm
350 lb/in = 6.2 kg/mm
300 lb/in = 5.3 kg/mm
250 lb/in = 4.5 kg/mm

kg/mm to lbs/in
16 = 896
15 = 840
14 = 784
13 = 728
12 = 672
11 = 616
10 = 560
9.0 = 504
8.5 = 476
8.0 = 448
7.5 = 420
7.0 = 392
6.5 = 364
6.0 = 336
5.5 = 308
5.0 = 280
4.5 = 252
4.0 = 224
3.0 = 168
2.0 = 112

Hope you guys find this helpful! Let us know if you have any questions about these numbers.

Filed under: Suspension No Comments

Vorsteiner BMW M4 Widebody In Yas Marina Blue


The new BMW M4 has quickly become a favorite amongst both BMW enthusiasts and those new to BMW. The twin turbo inline 6 has proven to make some intense power even stock. Vorsteiner, a very popular BMW aftermarket manufacturer for BMW's, has released a new version of their GTRS4 widebody kit for the BMW M4. The special blue color, known as Yas Marina, is becoming popular on widebody kits such as these as well as those who vinyl wrap their cars.


Vorsteiner says this widebody is a 10th anniversary edition, so expect these widebody kits to be released in low quantities. This kit is about as aggressive as the Liberty Walk widebody kit.

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Gabriel’s Lowered 2012 Volvo S60 T6 AWD with Exhaust


Gabriel came to us looking to lower his Volvo S60 T6 AWD and decided on getting H&R Sport Lowering Springs to lower his car 1.2 inches front and 1.2 inches rear.

After installing the springs, Gabriel wrote this review: "I have a 2012 Volvo S60 T6 AWD. and these H&R springs are a huge improvement. Drop the car more then 1.2. They almost Look like coilovers that are not maxed out. The car rides stiffer. Feels better on the highway. But avoid brick roads. It will throw you around!"


He continues with his mods list: "Right now it's just straight piped, K&N high flow air filter, Michelin super sports 235 40 and H&R lowering springs. And because of the springs im running more negative camber all the way around."

Gabriel has offered his email address ( to all other S60 owners who want to ask him questions about his car!

Nice S60, Gabriel!

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Stance your Honda Civic or Acura Integra with Ultra Low BLOX Street HS Coilovers

BLOX Street HS Coilovers - Stance Civic Integra

If you are looking to really lower your Honda Civic or Acura Integra, BLOX has the answer for you. The all new BLOX Street Series HS Coilovers feature a shortened shock body which gives you an even lower starting point than most other coilovers on the market. With a twin tube shock design and good shock stroke, these ultra low coilovers still provide a firm yet comfortable ride. Top mounts are included as are steel lower mounts for durability. These coilovers allow for you to have an aggressive stance with various wheel fitment combinations.

These coilovers have a 10kg/mm front spring and a 6kg/mm rear spring rate.

Get more info and pricing here:

BLOX Coilovers Honda Civic EG/EK [Street HS] (1992-2000) BXSS-00300
BLOX Coilovers Acura Integra GS/RS/LS/GSR [Street HS] (1994-2001) BXSS-00300


Jeremey’s 2015 Honda Civic Si on D2 Lowering Springs


Our customer, Jeremy, came to us looking to lower his 2015 Honda Civic Si. He decided on the 2015 Civic Si D2 Racing Lowering Springs to lower his car 2.0" in the front and 2.0" in the rear. With their lifetime warranty, progressive spring rate, and great price, he was excited to get them on the car!


Above is the car after the springs have been installed. We think it's a perfect drop and makes the car look much better by cleaning up the stock wheel gap.

The car looks great Jeremy, glad you like it!

Filed under: Honda 1 Comment

C7 Corvette Z06 with 375 Rear Tires!


Wow! A customer of ours showed us this car today and we just had to share it. It's simply beautiful. We know it's a C7 Corvette Z06 with 375 width rear tires. The wheels are 20 inch in the front and 21 inch in the rear. It looks like it has some suspension work as it's a bit lowered, but it could also be the way the wheels fill up the fender, reducing the gap.


If anyone knows more information on the owner of this car, or it's modifications, please let us know!

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2006 Lexus IS350 with Perfect Stance on Megan Racing EZ Street Coilovers

Our customer Mike came to us looking to add coilovers to this 2006 Lexus IS350 to give him the stance he wanted. Mike and his father painted the car Porsche Mint Green at their shop in Louisiana called Auto Perfection Inc and wanted to give it the right look. Mike went with Megan Racing EZ Street Coilovers , one of the most popular choices for the IS350, to lower his car and maintain good ride quality. We think the car turned out great, and the stance looks awesome.

Full mods list:

Custom Catback Exhaust
Lexus F sport Intake Box
Megan Racing EZ Street Coilovers
Megan Racing Camber Arms
Delinte D7 225/40/18 235/40/18
Koenig Torch 18x9 Front and 18x10 Rear (painted white)
Molded Wald Spoiler

For more pictures of this IS350, check out Mike and Auto Perfection Inc (Louisiana) on Instagram.

Filed under: Lexus, Suspension 1 Comment

C7 Corvette Z06 Heat Soak or ECU Timing Being Pulled?

There have been a lot of people complaining lately that after a few track laps their 2015 C7 Corvette Z06 feels slower. Initially people though that the supercharger was getting too hot, and so it was heatsoaking, effectively making the air going through the supercharger to the engine too hot and not making as much power.

GM has made a statement on this topic and has said that the problem is that the car is designed to pull back timing after some use, which helps to prevent any powertrain damage. They believe that the majority of owners will never race their C7 Z06, so they will never have this problem, or they simply won't notice. GM has said that there are aftermarket products you can purchase that will allow for you to override this feature in the ECU.

Some have said that the reason the ECU pulls back timing is because of the heat soak. The ECU sees the supercharger getting too hot, so it pulls back timing to prevent any engine damage. The real reason is still unknown, but those who are getting their C7 Z06 Corvettes dyno'd will soon test to see if the ECU pulls back timing when the supercharger air temps reach a certain temperature to cause heat soak.

If anyone has any data to prove either of the above, please contact us and we can share it here, so we can get down to the bottom of the power loss in the new Z06.

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2013 Subaru Forester XT Sleeper with COBB AccessPort


When our customer, Will, told us he was building a sleeper 2013 Subaru Forester XT Turbo, we were intrigued! Check out the modifications below that allowed for him to create 228 horsepower at all 4 wheels, and a very impressive 351 ft/lbs of torque! All of this through a stock exhaust, with minimal mods. The COBB AccessPort is a great tuning device, and we covered it in this other post previously.

Cobb Accesport
Cobb Downpipe
Cobb Intake with box
(Stock exhaust) - Sleeper!
Whiteline 22mm swaybars and endlinks
Dyno tune by PIA in Tacoma, WA

I looked long and hard for a 2013 Forester XT Touring with low miles, finally I tracked one down 175 miles away. It was well worth the search amd the wait. Before I even had license plates I had to fix the body roll and release the power held back by restrictive parts and tuning. It's now making a peak of 351awtq and 228awhp running 16lbs of boost on a custom map from PIA in Tacoma, WA. I kept the exhaust stock for road trips, and so my wife wouldn't kill me. My 16 month old daughter loves the car and makes growling noises every time I start it up. Thanks to Redline360 and PIA for the amazing customer service and mods. It's truly an amazing sleeper, and handles perfectly for daily driving and the ocassional (okay, more than ocassional) hard corner. I would highly recommend both Redline 360 and PIA to anyone looking for their car to perform at its best!

What an awesome daily driver! What do you think? Let us and Will know in the comments below!


Amir Ghadiri’s Track Prep 2013 Scion FR-S Turbo Build


Amir Ghadiri's 2013 Scion FR-S is simply awesome. Amir is building not only a solid turbo Scion FR-S using a CX Racing Turbo Kit, but he's also building the car for show.

Here are some details about the vehicle:

2013 Firestorm Scion FR-S

KW V3 coilovers
Ground control front camber plates
Stance rear lower control arms


Enkei RPF1 18x9.5 +38 square
Falken RT615k 265/35-18 square

CX Racing Turbo kit (prototype)
Full blown Motorsports radiator
Full blown Motorsports aluminum fan shroud w/ slim fans
Full blown Motorsports oil catch can
Drive Shaft Shop 600HP axles
Ultimate racing 3" catback exhaust


HT auto front lip (painted black)
CS side rockers (painted black)
CS rear spats/aprons (painted black)
Seibon VS style CF hood
Seibon GD style CF wing
50% full windshield tint
5% window tint
Black vinyl roof
Custom Laser cut aluminum splitter
Custom Laser cut aluminum side rocker extensions
Custom Laser cut aluminum rear diffuser
APR CF splitter (cut down, used as mounting surface for intercooler)
Black painted wheel wells
De badged rear with garnish holes filled & painted
Black tow hook (rear)


Exterior lighting:
WinJet black headlights
Factory fog lights
Smoked Valenti tail lights
Smoked reverse lights
Smoked side marker lights


Pioneer App Radio 3
Custom 1-piece micro suede wrapped dash panel
Black interior panels
Cusco red spin turn drift button
TRD shift knob
JDM center console armrest
OEM audio+
2 flush mount 12" subs (trunk floor)
Triple gauge A pillar pod
AEM digital oil pressure gauge
AEM digital wideband gauge
AEM digital truboost gauge

Car has many more mods but it gets hard to list it all. Car is regularly displayed at major events (spocom, 86fest, offset kings formula drift, extreme autofest, stancenation, etc) as well as weekly events such as cars & coffee irvine. Overall the car gets a great deal of publicity.

Make sure to check out Amir's Instagram @amirghadiri

Beautiful FR-S Amir, and excellent build!

Filed under: Scion FR-S No Comments