4396 replies to this topic

[CHILL Gone DUTCH]

Started to get the gear box out of the car this morning before family time

And found this on the subframe
The way it's cracked looks like the subframe has actually tornrather than just cracked




Never rains but it poors

Decided to not rush now and try have it ready for Anglesey

On a other note I did a 400 mile round trip yesterday to Somerset for a second hand clam

[hughcam]

That subframe looks absolutely FUBAR :/

[Arno]

And found this on the subframe
The way it's cracked looks like the subframe has actually tornrather than just cracked




 

 

IMHO That's a fairly normal stress crack in steel that has simply progressed over time. (the tip 'creeps' futher)

 

Likely it has been there for some time but (much) smaller. But as it progresses the area around it becomes more 'loose' so flexes more under repeated loads and that speeds it up and... you get the idea

 

A bit like bending a tab on a coke can back and forth. It will slowly 'give' and then rapidly come apart.

 

Definitely needs fixing though.. But luckily the subframes are (as far as I know) pretty boggo steel, so crack can be arrested (drill hole at tip), damaged area ground down and then a good weld bead to tie it all back together. If you want to be fancy you can do a dye penetrant test around the cracked area to see if there are any small 'branches' from the main crack that need attention too.

 

Bye, Arno.

[Arno]

Double post..

Edited by Arno, 27 July 2018 - 10:38 AM.

[CHILL Gone DUTCH]

Thanks arno I will take advice and re-weld and extra streghthening

[CHILL Gone DUTCH]

It deffenately was not there 18 months ago when I did suspension rebuild
But could be anytime after that

[Zoobeef]

Do you have a brace bar?

[siztenboots]

must admit , I never jack under those rear subframe parts where the undertray bolts to , metal there is very soft , always on the middle of chassis and only for short periods.

[siztenboots]

if the subframe had been powdercoated , would this have been visible during inspection?

[FLD]

These cracks are appearing from a sharp (ish) edge on the sheet steel making up the frame. Could the fix for this issue be as simple as dressing the corners off the edge where it starts and polishing up to remove the start point? I know this doesn't help Chill.

[CHILL Gone DUTCH]

REtired from the sprint series and decided to fix her up hopfully for next year when I might give it a other go

[mbes2]

Whoop whoop Exige Won! 

 

 

Will be good to see you back in 2019 

[SteveA]

How many rounds are left Chris?

[CHILL Gone DUTCH]

There's 3 rounds left

[CHILL Gone DUTCH]

Finally got round to taking he gearbix out to investigate the no pressure and found the slave/thrust bearing has had a bearing failure

[CHILL Gone DUTCH]

Not the end of the old but the clutch does have some wear on it so That's being replaced to

This brings up a other question is it worth sticking a 4.17 gearbox in there while it's off

The car will no longer be used on the road so track only and I currently can't remember using fith gear in the last 2/3 years infact the only time I remember using 5th is at zandvoort

Does anyone have the data between standard and 4.17 g box at 7500 rpm limiter please

[CHILL Gone DUTCH]

On a other note hat to remove the inlet to get to one bolt of bell housing

It's very clean in there since water injection and pcv system
Will check the laminovas before it goes back in

Edited by CHILL Gone DUTCH, 20 August 2018 - 04:00 PM.

[Danny Scarbro]

Not the end of the old but the clutch does have some wear on it so That's being replaced to

This brings up a other question is it worth sticking a 4.17 gearbox in there while it's off

The car will no longer be used on the road so track only and I currently can't remember using fith gear in the last 2/3 years infact the only time I remember using 5th is at zandvoort

Does anyone have the data between standard and 4.17 g box at 7500 rpm limiter please

Hopefully this will help you Chris;


Stock 3.95
mph / RPM 1000 2000 3000 4000 5000 6000 7000 7500
1st Gear 5.3 10.5 15.8 21.1 26.3 31.6 36.9 39.5
2nd Gear 9.3 18.7 28 37.3 46.7 56 65.3 70
3rd Gear 14 27.9 41.9 55.9 69.8 83.8 97.8 104.7
4th Gear 19.4 38.9 58.3 77.7 97.2 116.6 136.1 145.8
5th Gear 23.3 46.6 69.8 93.1 116.4 139.7 162.9 174.6

4.17 FD
mph / RPM 1000 2000 3000 4000 5000 6000 7000 7500
1st Gear 5 10 15 20 24.9 29.9 34.9 37.4
2nd Gear 8.8 17.7 26.5 35.4 44.2 53 61.9 66.3
3rd Gear 13.2 26.5 39.7 52.9 66.1 79.4 92.6 99.2
4th Gear 18.4 36.8 55.2 73.6 92.1 110.5 128.9 138.1
5th Gear 22 44.1 66.1 88.2 110.2 132.3 154.3 165.4

4.41 FD
mph / RPM 1000 2000 3000 4000 5000 6000 7000 7500
1st Gear 4.7 9.4 14.2 18.9 23.6 28.3 33 35.4
2nd Gear 8.4 16.7 25.1 33.4 41.8 50.2 58.5 62.7
3rd Gear 12.5 25 37.5 50 62.5 75.1 87.6 93.8
4th Gear 17.4 34.8 52.2 69.6 87 104.5 121.9 130.6
5th Gear 20.8 41.7 62.5 83.4 104.2 125.1 145.9 156.4



That's based on a 255/40/17 tyre? Is that correct?

4.41 would be perfect really, doubt you would see anymore than 156mph on any circuits in the UK...might be wrong though your car is seriously fast!

Dan

[CHILL Gone DUTCH]

Thanks for the information Dan
Think it's time for a 4.17

Rather than a 4.41

[MAXR]

Chris, what's the max speed you get upto along the main & back straight at Snet? Do you reach 150mph now? I have to get into 5th with a 4.17