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Discussion Starter · #361 ·
Do you think TIG welding would also be a bad idea, due to the potential of ripples? Or was that specific to brazing? I really like the idea.
The problem was the heat from the brazing - MIG or TIG should be better
There is also the rivet and glue approach - which I found tempting but chickened out as I was not sure about getting it through our certification process
 

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Discussion Starter · #362 ·
Im wondering if anyone here has sucessfully welded to car sheet metal with a arc welder? (cheaper than other types of welders) It seems possible if you turn the welder right down and tac weld back and forth with stops to cool?
Yes I have done a fair amount of that in the past - it requires much more careful preparation than gas welding but it is doable
 

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I know you've increased your tire diameter to decrease motor RPMs, is it worth changing diff gearing? Did the increase in tire diameter noticably decrease your low speed power at all? Seems like you have plenty of it?
 

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Discussion Starter · #364 ·
I know you've increased your tire diameter to decrease motor RPMs, is it worth changing diff gearing? Did the increase in tire diameter noticably decrease your low speed power at all? Seems like you have plenty of it?
Not really
I went from my 195/60/15 to 225/45/17 Nittos to get more grip - THEN I went to 235/45/17 Nexxens to drop the revs a wee bit but mostly so that I could use the Nittos on the front when on the track

195/60/15 --- 518/km - initial -- RPM at 96 mph (153 kph) - 5436 rpm
225/45/17 ---- 502/km - 3% larger RPM at 96 mph (153 kph) - 5248 rpm
235/45/17 ----- 495/km - 4.6% larger RPM at 96 mph (153 kph) - 5175 rpm

I'm having difficulty getting the Nexxens to grip - the slightly smaller Nittos appear to have more grip - so that is the limit - not the available torque

A taller diff might help - If I see one I will grab it - currently a 4.1:1 Subaru limited slip diff
 

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Discussion Starter · #365 ·
Not really
I went from my 195/60/15 to 225/45/17 Nittos to get more grip - THEN I went to 235/45/17 Nexxens to drop the revs a wee bit but mostly so that I could use the Nittos on the front when on the track

195/60/15 --- 518/km - initial -- RPM at 96 mph (153 kph) - 5436 rpm
225/45/17 ---- 502/km - 3% larger RPM at 96 mph (153 kph) - 5248 rpm
235/45/17 ----- 495/km - 4.6% larger RPM at 96 mph (153 kph) - 5175 rpm

I'm having difficulty getting the Nexxens to grip - the slightly smaller Nittos appear to have more grip - so that is the limit - not the available torque

A taller diff might help - If I see one I will grab it - currently a 4.1:1 Subaru limited slip diff
On the 1/4 mile I got to 104 mph (no traction at the start)
195/60/15 --- 518/km - initial -- RPM at 104 mph (168 kph) - 5946 rpm
225/45/17 ---- 502/km - 3% larger RPM at 104 mph (168 kph) - 5762 rpm
235/45/17 ----- 495/km - 4.6% larger RPM at 104 mph (168 kph) - 5682 rpm

No chance of getting there with the 15 inch wheels! - no grip
I intend to try the Nittos at the next meeting

The chief forklift motor Guru (Major) has said that my motor "should" be OK at 6500 rpm !!!
At 6000 rpm with the Nittos I would be doing 175 kps - 109 mph

At 6500 rpm - 189.6 kph - 118.5 mph
 

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Discussion Starter · #366 · (Edited)
Went Drag racing on Sunday
Great day out
I joined the local club so they put me in their shoot out - randomly selected lanes and opponents
First run against a turbocharged 5 liter Mustang - I won
Second run against an M3 BMW - I won
Third run against a supercharged and nitro Falcon - I won
Fourth Run - this guy had a bloody parachute bolted to the back of his EVO - I lost!

I only have the times for the last run
1/8th mile - 7.987 - 95.1 mph
1/4 mile - 12.218 - 109.5 mph

The EVO nearly broke into the 8's - 9.01 and 157 mph

109.5 mph is 6045 rpm - I think I need slightly taller tyres
 

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Discussion Starter · #368 ·
Did you note the EVO's time/speed in the eighth?
It did 5.967 and 125.4 in the 1/8th

It was going a lot faster than me at the end but when he opened the parachute I was leaning hard on the brakes to stay behind him - then he stopped to remove it and I tootled past him and around the rest of the track
This drag race was set up as part of the Teretonga circuit so after the drag bit you are meant to drive sedately around the rest of the circuit - which of course is what I did!
 

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Discussion Starter · #369 ·
On Saturday we had our first Autocross of the new year

Gardners Autocross - in a paddock owned by the Gardner family

It was superb - great fun




 
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