heinzboehmer's 2002 Topaz 6MT Coupe

[George Hill]

I think I've finally perfected the technique to drain coolant on this car without making a mess of my garage floor. Documenting the steps here for future reference:

1. Remove all shrouds and belly pan
2. Set catch pan underneath general lower radiator hose area
3. Slightly lift up temp sensor on lower radiator hose
4. Let coolant drip out
5. Slowly undo expansion tank cap
6. Let coolant drip out
7. Squeeze upper radiator hose a million times to get as much coolant out as possible
8. Slowly disconnect lower radiator hose
9. Let remaining coolant drip out

Key is to always have a very small stream coming out of the sensor port. This will keep splashing to a minimum. Yes, it is tedious and does take forever, but I find this preferable to cleaning up a huge coolant spill. Example of how slowly coolant should be coming out:

Thats pretty much how I do it too, nice work.

[heinzboehmer]

I think I've finally perfected the technique to drain coolant on this car without making a mess of my garage floor. Documenting the steps here for future reference:

1. Remove all shrouds and belly pan
2. Set catch pan underneath general lower radiator hose area
3. Slightly lift up temp sensor on lower radiator hose
4. Let coolant drip out
5. Slowly undo expansion tank cap
6. Let coolant drip out
7. Squeeze upper radiator hose a million times to get as much coolant out as possible
8. Slowly disconnect lower radiator hose
9. Let remaining coolant drip out

Key is to always have a very small stream coming out of the sensor port. This will keep splashing to a minimum. Yes, it is tedious and does take forever, but I find this preferable to cleaning up a huge coolant spill. Example of how slowly coolant should be coming out:



Anyway, whole point of this exercise is to swap in a new radiator, so let's get to that.

There was a bit of debris in between the condenser and rad, but not a ton:



Vacuumed all that out and then blew out the condenser as best I could. There are still some small rocks really wedged in there, but this is as good as it's gonna get without complete replacement.

Original rad had definitely seen better days:




As others have noted, OE radiator is still being listed under the Modine brand by most online retailers, but is actually labeled as NRF:



Forgot to take a picture of the shiny new rad in the engine bay, but whatever, everyone knows what a radiator looks like.

Initial tests look good. Seeing ~10 C temp drops across the rad around town, so similar to before. Will test further, but I likely won't see a huge difference (if any) on the street, since the previous rad was working fine in those conditions. Need to book another hot track day to see how the car does there.

And since I had all this stuff out of the way, I replaced the idler pulleys + hardware on the main belt.




Nothing super interesting there, except for maybe that black "protection cap", which my car did not come with when I bought it. I'm assuming some previous mechanic lost it at some point.

[tlow98]

So when are we making that custom rear subframe?

I’m in to help with this project!

[George Hill]

No exhaust, no problem, lol.

[heinzboehmer]

Yeah exhaust clearance is definitely the biggest issue. I bet you'd end up needing to build a custom section 2 to get around the lower pickup points.

[Bry5on]

Could this be as "simple" as cutting off the old RCA pickups on the stock subframe and welding on new ones but lower? I suppose you could then use two pairs of ARCAs with coilover rear suspension. I might be able to do some scanning with the Einstar and experimenting on my track car over the winter.

A scan would be awesome if you’re willing to share it! The issue is exhaust clearance, but yes that approach could get you there.

[ethan]

So when are we making that custom rear subframe?

Could this be as "simple" as cutting off the old RCA pickups on the stock subframe and welding on new ones but lower? I suppose you could then use two pairs of ARCAs with coilover rear suspension. I might be able to do some scanning with the Einstar and experimenting on my track car over the winter.

[heinzboehmer]

It probably does! Rear suspension looks jacked up because of that damn high rear roll center, and the camber changes *significantly* with ride height because that instant center is basically in the diff, related to the stupid high roll center.

So when are we making that custom rear subframe?

[bigjae46]

I took the rear bumper off to do the muffler swap and noticed that the adhesive on some of the crash bar tabs had failed, so fixed that. Cleaned the area and reattached the tabs with JB plastic bonder. I also decided to add a couple rivets to each tab (including the ones that still hadn't fallen off) for some extra security. Don't think these are coming off anytime soon.

No adhesive seemed to work for me...rivets seem to be the only way to go.

[Bry5on]

Think this pic illustrates the motivation behind the camber arms quite well:

Rear right wheel looks almost like it's got positive camber!]

It probably does! Rear suspension looks jacked up because of that damn high rear roll center, and the camber changes *significantly* with ride height because that instant center is basically in the diff, related to the stupid high roll center.

Apologies for the thread hijack.

[mention]Bry5on[/mention] are you okay with me adding this to the CAD files master list sticky for everyone's future reference? https://r.tapatalk.com/shareLink/topic?share_fid=2212386&share_tid=271707&url=https %3A%2F%2Fnam3forum%2Ecom%2Fforums%2Fmobiquo%2Fredi rect%2Ephp%3Ftid%3D271707&share_type=t&link_source =app

Yep, no problem

[karter16]

Thanks ethan for hosting! Files can be downloaded here: http://bry5on-nam3forum.sfo2.digital...step_files.zip

Apologies for the thread hijack.

[mention]Bry5on [/mention] are you okay with me adding this to the CAD files master list sticky for everyone's future reference? https://r.tapatalk.com/shareLink/top...ink_source=app


Sent from my iPhone using Tapatalk

[heinzboehmer]

Think this pic illustrates the motivation behind the camber arms quite well:



Rear right wheel looks almost like it's got positive camber!

Also, cool pic with friends:

[Bry5on]

Happy to host them on S3. PM me if that would be helpful.

Thanks ethan for hosting! Files can be downloaded here: http://bry5on-nam3forum.sfo2.digital...step_files.zip

[heinzboehmer]

Also I believe heinzboehmer redesigned the upper duct to better match the dust shield if memory serves. Heinz, shoot me that file if you want.

Sorta. I redesigned the upper duct to match my modified brake shields. I had previously cut them to install circular flanges for traditional brake duct hoses.




Happy to share the files, but they're matched to the cut shields on my car, so not sure they'll be useful to anyone else.

[ethan]

Follow instructions here for flap trimming: https://nam3forum.com/forums/forum/m...963#post253963

Trying to upload step files but they’re too big for the forum. Will have to find a spot to host them. Also I believe heinzboehmer redesigned the upper duct to better match the dust shield if memory serves. Heinz, shoot me that file if you want.

Happy to host them on S3. PM me if that would be helpful.