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620 with s13 front suspension


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#1 Drewmcinnes

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Posted 20 May 2017 - 05:26 PM

Ok guys
I'm about to remove all my front suspension and origanal mount points to accomodate
S13 crossmember and suspension. So hears my question, every one I have seen fabricates suspension turrets off the chassis and then just cuts out the inner wings.

I'm thinking a little out of the box here, so hear me out. What if I solid mount the cab to chassis, then make a suspension turret onto the body and then an addition body mody mount inbetween the firewall and the new front suspension. basically incorporating the strut turret into the body for a nice finish. Once the body is solid mounted the new strut tops wouldn't flex with articulation.

Can anyone see any problems with this in theory??
Any ideas would be excellent.
Basically this is a street truck in Australia so I need this to be legal on the road.

Kind regards
Andy

#2 willz

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Posted 20 May 2017 - 05:42 PM

I think Chad Copeland has fit an s13 front section into a 620 with an sr20det. Been a while since I've read his build though so I could be wrong

#3 Drewmcinnes

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Posted 20 May 2017 - 05:43 PM

Yep chad did but he has built suspension turrets off the chassis.

#4 thisismatt

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Posted 20 May 2017 - 09:00 PM

Check out bob3's MX520 build. He did what you are describing, I think
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#5 Lockleaf

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Posted 20 May 2017 - 09:22 PM

What is the advantage of what you are describing?

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#6 wayno

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Posted 20 May 2017 - 09:39 PM

Anything that connects the suspension to the body/cab is going to cause massive noise/vibration/rattling, same with attaching the cab solid to the chassis, massive noise inside the cab while it is being driven, that is why the cab is connected to the chassis with rubber isolators, to control noise/vibration/rattling as the cab is like a drum and the noise gets amplified, even my inner fender well sheet metal touching my steering gear caused a lot of noise in the cab.


 

 


#7 Drewmcinnes

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Posted 20 May 2017 - 10:08 PM

I understand that the noise may increase but one would argue it's no different
From when 4wd owners do a body lift with a solid bush.

I'm unsure if there will be any real benefit I just think it would look very clean and
Have a nice finish.

#8 MikeRL411

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Posted 20 May 2017 - 10:20 PM

I understand that the noise may increase but one would argue it's no different
From when 4wd owners do a body lift with a solid bush.

I'm unsure if there will be any real benefit I just think it would look very clean and
Have a nice finish.

 

Form over function?  Let's us get real!  Drive it or look at it.



#9 Drewmcinnes

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Posted 20 May 2017 - 10:24 PM

It's not really the look per say I'm going for. In Australia our road rules
Are rather strict so I'm more so trying to incorporate the simplest and cleanest,
Possibly even factory like finish I can apply.

The idea stemmed from the fact I don't want to reamed by the police
And the more factory like finish I can get it finished the better.

Hope that makes sense

#10 Lockleaf

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Posted 20 May 2017 - 11:10 PM

I would say build the towers on the frame like people normally do. Then build the fender wells to fit those towers. You get the the structural benefits of building it on the frame, but visually it appears to be part of the body?

Half Pint ('71 510 Goon) http://community.rat...agon/p?=1269361

 

Audrey ('69 Roadster 1600) http://community.rat...rey-the-ratster

 

Tiny Havok ('85 720 DIY built Crewcab 4x4) http://community.rat...ache/?p=1395455

 

720 Shenanigans http://community.rat...20-shenanigans/


#11 Drewmcinnes

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Posted 21 May 2017 - 12:21 AM

Sounds like a plan

#12 datzenmike

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Posted 21 May 2017 - 06:47 AM

Ok guys
I'm about to remove all my front suspension and origanal mount points to accomodate
S13 crossmember and suspension. So hears my question, every one I have seen fabricates suspension turrets off the chassis and then just cuts out the inner wings.

I'm thinking a little out of the box here, so hear me out. What if I solid mount the cab to chassis, then make a suspension turret onto the body and then an addition body mody mount inbetween the firewall and the new front suspension. basically incorporating the strut turret into the body for a nice finish. Once the body is solid mounted the new strut tops wouldn't flex with articulation.

Can anyone see any problems with this in theory??
Any ideas would be excellent.
Basically this is a street truck in Australia so I need this to be legal on the road.

Kind regards
Andy

 
 
The 620 body was never designed to support the suspension as it has a solid frame for this. This is a really bad idea and the body will fold like a banana over time. Maybe the first good speed bump.

 

Off road... solid mounts. I guess in extreme use (flying through the air) the body would act like shaking Jello pudding on a plate.

 

Street... use rubber mounts. There is no reason for solid mounting whatever.


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#13 Greiggy

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Posted 24 May 2017 - 02:07 AM

first up - talk to an engineer about this...  there are plenty around brisbane who will let you know what can and can't be done.

 

Look for people who can mod plate codes LS3 and LS4. To be legal there has to be design work done and approved before any fabrication is done, so the vehicle complies with ADR's etc...

 

If it was my car and i was trying to get rid of the steering setup, id be installing coilovers in place of the factory shock ( look at beebani's kits for ideas) and then converting the car to rack and pinion using a custom rack and ends to suit. 

 

I've spoke to quite a few engineers and they all have said its quite a big job to do, but could be done if time and money is no problem.

 

I hope this info hasnt scared you off as that wasnt my intention.... but if your going to do it and make it legal, get the right info first so it is legal and safe as well.

 

If you want to know anymore pm me, happy to talk to you :thumbup:


sjeff64 - I wonder if it is a Datsun thing to always flip the "bird " in a picture of your rig LOL


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#14 BEEBANI

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Posted 24 May 2017 - 05:23 AM

I've sent quite a few sets of my control arms and coilover mounts over to your neck of the woods, I know of at least one that's complete and driving without any issues.  The biggest problem is finding the Navara parts for the spindle/hub swap I believe.



#15 G-Duax

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Posted 25 May 2017 - 09:30 AM

S13 is a strut suspension, and the rather tall upper spring mount position would put a lot of twisting force into the 620 frame rails.

The S13 is a unibody, and designed to have some strength higher up.

I say some, because people still run strut bars to keep the unibody from flexing.

 

Personally I think an S13 front is a bad choice.



#16 datsunfreak

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Posted 25 May 2017 - 03:56 PM

Can't seem to locate his build thread, but I know member Rhapakatui did something along these lines. He used an Infiniti J30 (your Nissan Leopard?) for a donor. Similar suspension design to an S13/S14 but with a V6 engine. 

 

 


It's your car, just don't ruin it.

 

It's also not my money, so i'll suggest the most expensive option. 

 

 


#17 willz

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Posted 25 May 2017 - 04:14 PM

You could always just buy beebanis coilover kit if you're wanting something different. I'm not sure what you're trying to accomplish with the s13 subframe

#18 thisismatt

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Posted 25 May 2017 - 04:52 PM

I've sent quite a few sets of my control arms and coilover mounts over to your neck of the woods, I know of at least one that's complete and driving without any issues.  The biggest problem is finding the Navara parts for the spindle/hub swap I believe.

 

Does that mean your arms have passed engineering in AUS?


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#19 Drewmcinnes

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Posted 11 June 2017 - 10:59 PM

Spoke with an engineer and he is happy for me to triangulate a suspension turret to mount s13 from suspension.
No dramas there. I will have to just trim the inner guard on the body to clear the suspension.
He actually suggested me running an s13 rear crossmember as that way all the suspension and brakes are from
One specific car and won't have to brake test it

#20 Greiggy

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Posted 15 June 2017 - 09:43 PM

thats great news buddy!!

 

continue to talk to him throughout your build and you will have no problems when the time comes to get the car registered and road legal!! 


sjeff64 - I wonder if it is a Datsun thing to always flip the "bird " in a picture of your rig LOL


1978 SR20DET 620 'TOY-620'

72, 73, 77, 77 donor parts vehicles.