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coming from a former modded duramax owner, yes you need the intercooler on those engines unless you detune the crap out of them, the reason alot of older small diesels dont have intercoolers is because...they dont have turbo's. The other reason is heat, cast iron handles heat and pressure much better than aluminum, which the duramax is entirely constructed from
 

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flamethrower
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Discussion Starter #723
You could check out Tech Tim's version at Wild West Off Road....

https://www.wildwestoffroad.com/catalog/ifs-kits-and-components/cat_13.html

This is as close as you can get to a Kit. Then you will need to hire someone to install it.

Kits are tough, and a ground breaking as this build is, Tech Tim has taken it one step further. Yes, his is designed for Toyota, but IFS is IFS, and it could easily be adapted to any vehicle.
 

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flamethrower
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Discussion Starter #727
A lot of it depends on what you are starting with, and how bullet proof you want to go. :D
 

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Hi Bebe,

I am an FJ cruiser owner and recently going long travel with the bolt on kit made by Allpro. I am new to Pirate4x4 and I found your build thread during google search. Your build is truely astonishing and gave lots of IFS guys more hope and confidence. I'm sure you have already received overwhelming compliment so I will cut straight to the cake:)

On page 17, how do you figure out the right spring rate which helped you gain the extra flex? I tried to search through your build thread but couldn't find more on that. I assume the front and rear need to have similar "stiffness" in order to get the most flex? I saw most IFS front + SA rear setup the rear usually takes up all the flex while the front is stiff and leveled.

Hope I can gain some insight from you. My sincere appreciation in advance!

Thank you!
Kai
 

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flamethrower
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Discussion Starter #730
Hi Bebe,

I am an FJ cruiser owner and recently going long travel with the bolt on kit made by Allpro. I am new to Pirate4x4 and I found your build thread during google search. Your build is truely astonishing and gave lots of IFS guys more hope and confidence. I'm sure you have already received overwhelming compliment so I will cut straight to the cake:)

On page 17, how do you figure out the right spring rate which helped you gain the extra flex? I tried to search through your build thread but couldn't find more on that. I assume the front and rear need to have similar "stiffness" in order to get the most flex? I saw most IFS front + SA rear setup the rear usually takes up all the flex while the front is stiff and leveled.

Hope I can gain some insight from you. My sincere appreciation in advance!

Thank you!
Kai
Honestly Kai-

The first advice I received was from Mike Shaffer who builds desert racers. He said, "calculate what you think it should be and then double it". He wasn't far off.

You will need to obtain corner weights, and calculate both sprung and un-sprung weight. Then using a website spring calculator (I should have one posted in my thread), enter the required dimensions (shock angle and distance from center) and weights, it will recommend a spring rate. You'll also need to consider if you want to do a single rate or a dual rate set up.

I am running 650/750 in the front. We started with 350/450 - LOL.

You need enough spring to carry the weight of the vehicle at the desired ride height - but not too much, or it will be too stiff. Honestly the vehicle does most of the work via a-arm design - that's what determines the amount of flex and ratio. Off road performance is important, but don't lose sight of the on road aspect. Your vehicle needs to be safe on the road, so err on the side of appropriate on road performance. If it's too soft you will have a hard time maintaining control at speed on sweeping turns.

I have leaf springs in the rear, so that rate is set by the manufacturer. Shock is more important here, and we still need to re-tune my shocks for desert running. I have too high a rebound rate at the moment.

Lots of Internet research is really the way to go, every time I learned an new term and a new aspect of tuning long travel IFS.

Good luck, and don't forget to post your build on Pirate4x4.com

Bebe
 

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flamethrower
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Discussion Starter #731
PS always use the post number, there are different settings for number of posts per page...I only have 15 for this thread :)
 

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Honestly Kai-

The first advice I received was from Mike Shaffer who builds desert racers. He said, "calculate what you think it should be and then double it". He wasn't far off.

You will need to obtain corner weights, and calculate both sprung and un-sprung weight. Then using a website spring calculator (I should have one posted in my thread), enter the required dimensions (shock angle and distance from center) and weights, it will recommend a spring rate. You'll also need to consider if you want to do a single rate or a dual rate set up.

I am running 650/750 in the front. We started with 350/450 - LOL.

You need enough spring to carry the weight of the vehicle at the desired ride height - but not too much, or it will be too stiff. Honestly the vehicle does most of the work via a-arm design - that's what determines the amount of flex and ratio. Off road performance is important, but don't lose sight of the on road aspect. Your vehicle needs to be safe on the road, so err on the side of appropriate on road performance. If it's too soft you will have a hard time maintaining control at speed on sweeping turns.

I have leaf springs in the rear, so that rate is set by the manufacturer. Shock is more important here, and we still need to re-tune my shocks for desert running. I have too high a rebound rate at the moment.

Lots of Internet research is really the way to go, every time I learned an new term and a new aspect of tuning long travel IFS.

Good luck, and don't forget to post your build on Pirate4x4.com

Bebe
Thanks a lot for the detailed info! This is very helpful. My setup is much less involved than yours and I'm just buying off the shelf package. The coilover that the vendor recommend is 650 single rate, which sounds like in the ballpark. I have always thought that's too much and I should put a soft spring for crawling, but it seems it's not the case.

Glad that I came across here and I will get more involved in Pirate4x4. Much more to learn from you guys.

Thank you again!
Kai
 
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