10 replies to this topic

[Jaska]

I’m trying to find out wether my front subframe is pushed in or not. The previous owner is without a doubt crashed it, and all the body panels were changed in the front. However, there was a gap about 50mm between the front of the subframe and the mounting points on the front panel. I thought that was due to bad fitting of the new panels (the welds for example were terrible).

After driving like thos for a couple of years the 998 decided to stop working, and after some headscratching i decided to do an engine conversion. I made up a jig and made measurements, after that i started chopping the subframe.
I’ve now fitted the engine etc, but the clearances seem much tighter than others i have seen doing the same conversion.

That leads to my question, due to there being some mixed information about the front to back dimensions of the subframe, can someone measure or tell me what is the measurement from top arm mounting hole to the front of the subframe, where the mounting point is? Thanks in advance.

-Jaakko

Ps. I have seen the body dimensions and jig information pics but there seems to be quite difference between the measurements between front mounting points and tower bolts? My subframe is single bolt rubber mounted type, but the measurement i’m asking should be the same in all subframes right?

[nicklouse]

it is not a given standard measurement so you are going to have to show how you want it measuring if the standard set-up measurements in the Haynes manual are not enough.

so front hole or rear hole?

[Jaska]

If its possible, (you don’t have the top arm in place) can you ”hook” the tape measure to the hole of the top arm, and measure the distance to the top front corner of the front crossmember? Or just from the front ”wall” of the tower to the front of the crossmember? Does that make any sense :)

[Jaska]

Oh, and yes the front hole of the top arm mount

[ukcooper]

 Mini_Jig_info2.jpg   39.75K   62 downloads

 

 mini_subframe2.jpg   33.96K   53 downloads

[Jaska]

I have seen those, but the top one does seem to have some difference to this if im not missing anything?

The ”jig diagram” suggests that the measurement from tower mount to front mount is 379mm and the body dimensions diagram suggests it is 469,1mm? Im aware there might be some difference due the rubber mounts as the other measurements are for the body and the other for the subframe but i dont think that should be 9cm? Again i might have missed something crucial here :))

[Jaska]

 296239B2-0585-4EE0-A448-17A0FF0D04CB.jpeg   186.83K   9 downloads

[KTS]

..you need to bear in mind that the upper arm is not perpendicular to the car - it's angled slightly forward, so the wheel centreline is ahead of the subframe tower centre line

 

measurements from my subframe are 323mm from subframe front face to the front face of the front tower side, and 427mm to the rear face of the rear tower side. (..measured at the level of the front fixing hole..) 

[Jaska]

Thank you for measuring that. Yes i understand that the wheel centerline is not the same as the tower centerline, isn’t that the measurement C on the vertical alignment vheck diagram?

[KTS]

Thank you for measuring that. Yes i understand that the wheel centerline is not the same as the tower centerline, isn’t that the measurement C on the vertical alignment vheck diagram?

 

yes  - my bad

 

as far as i'm aware the best diy method to check for a bent subframe is to measure compare the diagonals as shown on ukcoopers post above

Edited by KTS, 21 August 2018 - 06:41 AM.

[Jaska]

I actually did compare the diagonals before cutting, and if i remember correctly there were some diffeence so i adjusted the mounts once i made the cuts. I made sure the frame is symmetrical. I thought that the front crossbeam might have moved backwards in that process as i didn’t have a reliable source to check the measurement from front to back. But, thanks to you KTS I now have at least one measurement to refer :) also thanks for everyone else who posted to help

-Jaakko