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      Still the original, still the best Nissan Datsun resource   11/02/2017

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dat14u

1968 Ca18Det 510

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Boring update.

Had fun at the Skyline Nationals at Wakefield.

Was good to be out with some old school motorsport beasts.

There were way too many cars on the track to get a clean lap in but was good fun.

Chasing one of the original Winfield GTR's. Slicks + 4wd = I lose.

http://racing.natsoft.com.au/637343890/object_21771760.94F/Result?1

I went back out a few weeks later with yet another brake combo on the front.

It was just speed off the streets. Not very many exciting cars there.

Did a best of 1.09.1 hand timed. This day saw the front left tyre down to canvas.

Last week i did a few laps at SMP GP circuit for the Motor Magazine twilight night.

It was overcast with patchy rain. This made for interesting turn in with 6 year old $50 tyres on the front.

I was pretty happy to hit the limiter in 5th in the last session. 7200+225/50/15+3.9=250kmph!

Thanks for the Gopro Mr P!

As i tend to do when something wears out...replace - no...upgrade - yes.

Front tyres need replacing now. Rears maybe 1 more track day.

So that means the fronts will turn from 205/50/15 to 225/45/16.

And the rears will turn from 225/50/15 to 265/45/16.

That means flares on the rear and probably a move from 3.90 gears to ~4.3.

Im going to try and compete in all 8 rounds of the NSW supersprint CChip next year SVC.

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nice up date and vids mate, loved them

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Few pics of masacre...

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No dramas doing any of this with the workshop and hoist...

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The (much) taller tyres convinced me to change diff ratio's.

I got my hands on the same diff from a Y31 cima in 4.36.

This will lower the top speed to 230kmph @ 7200

7500 will see it to 240ish.

Interestingly and annoyingly the inner cv's were different, and at closer

inspection the centres were actually different too.

They have a washer thet sits between the 2 cv's.

The 3.90 centre has this washer 10mm closer to the passanger side when

compared to the 4.4. This means i had to put my axles into the cv's that

came with the 4.4 diff.

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First round is 24 March at Wakefield which is coming up pretty quickly.

Ill have to pull my finger out.

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Post nats update.

Got the car running barely before 24/3 track day at Wakefield.

Had a good day out, the car handled pretty similar to before.

It felt quicker but ended up with 1.10.1 as the quickest time for the day.

I was pretty dissapointed but what do you do.

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Drove down to PI for the nats.

Had a good run down.

Had a few issues on the track.

Of 3 timed sessions i had a blown cooler pipe twice and a broken wire to the fuel pump fuse = 3 DNF's.

Got to know the tow vehicle guy pretty good:(

Had a best of 1.57 and the car had heaps left so wasnt too bad.

Put the street tyres back on before driving home and noticed a bit of brake fluid coming from one of the crossover pipes on the front calliper.

Drove home no dramas.

I tried to tighten the flare nut on that calliper and the tube tore.

Im done with these shit brakes. wasted alot of my time and money.

Im booked in for round 2 at SMP GP this weekend so stole some brakes off a mates shell. hopefully they fit.

After this weekend ill embark on yet another probable wast of time and money.

Evo brembos front and back.

Fronts will be pretty easy. Havent really looked at the backs.

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Just got home from work nice and early, keen to do some work on the Dat.

I cant find my keys to the garage so locked out of it till the mrs gets home with the other keys :(

So thought ide update.

I put some 256 vented rotors on the front with hilux callipers for SMP GP.

They worked well until the pedal started hitting the floor on the second lap.

i Bled them between races but no difference.

The brakes worked but the pedal would hit the floor, not amazing for confidence.

The pads are now glazed white. I guess they didnt like it much.

Any way i finished 40 of 136 entries. 9th in class. Best lap of 151.4

The car felt pretty good. A little understeer though.

last session when i snuck out last behind the quicker group and had traffic free track

Thanks to Steve for the callipers and GoPro. Thanks to Graeme for the rotors.

Obviously me thinking i hit the limiter in 5th a few months ago was bullshit. I wasnt even hitting 220kmph.

From Round 1 a few weeks ago

You can hear the diff opening up coming through the fishhook.

Just another thing to add to the list.

The 3.90 vlsd never had an issue.

Ive read about shimming them, i might look at that in the future.

In the meantime i have the brakes v54.11 underway.

Im using 330mm front crappydoor rotors with a pretty basic alloy bracket.

Rear is 280mm silvia rotors and an alloy bracket.

I plan to use a wilwood park brake same as datsport for their twin spot rears.

I have the front and rear rotors bolted on on 1 side. i have the alloy for the front bracket, just have to drill a couple of holes in it.

Still need to buy the alloy for the rears.

Master stays the same 17/16 that i had on with the wilwoods.

Next race is 2/6 at SMP long which will come up pretty fast on me.

I need to get this thing on the road!

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HI Mate, Good time's at Eastern Creek,

Well done, Can't wait to join you with the race car in a couple of months time,

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Brakes are finished and are awesome.

While i had it all in bits i stiffened the rear springs a bit.

Missed round 3 because of personal reasons but it was pissing rain so not a great loss.

Had round 4 on the weekend. The car felt great but the vlsd wasnt working too well.

Time to pull the rear out and play with the diff.

http://www.youtube.com/watch?v=oTXlpeJSZ10

http://www.youtube.com/watch?v=TgesoZ34R-w

Ill take some pics of the brakes at some stage

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All these updates from you and SJ are giving me motivation to dust off my race car.

I've just chucked in an FJ that was taking up valuable garage floor space.

I may just have to get it running now :teehee:

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Greats stuff Andrew,

Yes Graeme, Sounds good, But you have two race cars now,, But the FJ will be good in the old Historic race datsun 1600,

I'm keen to do a couple of 6 hour marathons, which run with a team of 4 cars, ( just have to finish the race car )

cheers

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great update Mr peters. How did you get the speedo up in the left corner, of the video's ??

Shawn, i'd be keen to do a 6 hr or something like that..

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Hi Mark, I think its an app on his phone,

Yes me too, I will look into it,

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More fiddling with the car as that is pretty much all i do these days.

Post round 4 i pulled the rear end out and and bit the bullet and bought a KAAZ lsd centre.

Fitted it all up and ran it in before round 5.

I also attacked the front guards and started making some flares.

Ran pretty well at SMP south. Finished 29 of 97 and 5th in class. My best result so far.

The car was back to understeering a bit with the extra mid corner grip and was overall a handfull on the tight track.

Got down to a best lap of 1.03.0

Forgot to borrow GoPro so footage is iphone

http://www.youtube.com/watch?v=EJUVh7tH69Q

Some other pics

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pre massacre

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Back to Wakefield next weekend where lap times mean something to me.

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Had an awesome day at WP on the weekend.

Car went well although still a bit of understeer.

Killed my PB and ran 1.07.9

Pretty boring video, was first out with no traffic.

http://www.youtube.com/watch?v=ACeJ4KWTQC4

Few pics of the front flares

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The handbrake isnt working very well.

The calliper is floating, and the slots on the rotors bang on the pads and they rattle around and i guess ware the pads down a bit so its loose.

ill try hard mounting it at some stage

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Super fully sik update time

Out at SMP North the other day for round 7.

Finished 33/97 and 1.13.2 best lap.

Was starting to get used to the new couple of turns but blew 5th gear.

Owell the box has been in the car for several years of abuse without being touched.

Ill pull it out and see whats wrong, before fixing it and im going to cryo freeze it before reinstall.

Im going to strip the engine and have a look at the bearings and bores.

Its only done about 10k since rebuild so all should be good.

http://www.youtube.c...h?v=bZzTbW7sJa8

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Been a while.

Since last post i have been pottering away.

I rebuilt the gearbox with a spare shaft and new bearings.

I cryo froze all the metal parts inside. Not sure if that would do anything but was $50.

The summer mod plan was wider tyres on the front and a bit of aero.

I had to slightly widen the front flares.

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Before the racing season started i did a drift day with SDC.

I sucked at drifting and managed to clean snap both axles.

First time in 15 years i have ever not driven home from a track day in 1 piece.

Turns out there was a big dip in the track that when hitting it at speed and turning the rear swaybar was bottoming out on the axles.

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Had new unbreakable axles made by Mark Axisa to replace the broken unbreakable axles . Quality is insane. Was a pretty $$ day out though.

Fast forward a few months to Round 1 at Wakefield.

So i was very unsure as to how the car would handle now.

It now has 265/605 Dunlop 2nd hand slicks on each corner and i added a rear wing.

I did a wheel alignment to end up with approx:

front castor 6.5deg; camber -2.5 to -5 range; 3mm toe out each side.

rear whatever it used to be.

The car handled pretty well, only noticeable difference was the high speed understeer due to the rear wing lifting the front.

At wakefield this is pretty easy to counter with trail braking.

Overall grip felt better with noticeable difference getting on the power out of corners and through the fishhook.

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Best of the day 1.07.0 which is 1 sec quicker than previous. I think it was more due to the wing and smaller rear tyre diameter than actual change to full slicks.

The old rear tyres are 645 diameter, so the change to 605 is the equivalent of going from a 3.9 to 4.3 diff ratio.

i started the day with -5 camber as ide read slicks usually like lots and aimed at 32psi hot as i couldnt find any info on rough pressures.

The inside of the tyres was way hotter so i took some camber out, didnt measure but maybe down to -4.

The inside was still hotter but i didnt change it again.

For the last session i took the rear wing off and it turned into an oversteering beast. Ide say mix of less rear down force and front suspension not stiff enough.

It was 1.7 secs slower in that session.

Gopro had issues so no decent footage.

Round 2 at SMP GP.

I didnt change too much, i started making a splitter but didnt finish it.

I turned up the boost a bit, now around 21psi.

It was a good day out in the end. I went 4 secs faster than last time. 1.47.4

My fastest lap of the day was my very first hot lap where i had no confidence in the tyres at all and was braking early and coasting around.

Everything i tried throughout the day just saw the times going backwards.

This is my first 2 laps

This is a later session

As you can see alot of sideways action and generally not much grip.

The rear wing adds alot of drag. I have been told by a few different guys at the track they lost up to 20kmph on the strait here.

I am 2 kmph faster than last year so the extra 1psi and smaller rear tyres are making a big difference.

At the end of the second last session i was black flagged. Apparently the wing was flexing and bowing in the middle too much and they were worried it may snap.

I took the wing off for the last session and ended up spinning on the first hot lap at 230kmph at the end of the strait.

I didnt finish the lap so the gps data didnt save.

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Pretty lucky to get away with that 1. 4 flat spots is all, lucky they are only $50ea.

I have since bought another set of tyres and got some more info on them.

They shoudnt be at any more than 28psi and were probably overheating the rears hence grip continually fading.

SMP North in 2 weeks so im going to finish the splitter, take out some camber and try lower pressures.

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I forgot to mention what happened to the gearbox.

The 5th gear - reverse gear shaft snapped clean.

I was out at SMP North last weekend.

Was a great day at the track.

The weather was a bit average with a little early rain and rain threatening all day and strong winds.

I managed to put a splitter together in time.

Its acp panel with a 20mm square alloy frame that bolts to the front chassis rail and the back of the xmember.

I also put a brace in the middle of the rear wing.

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A note on handling from last time.

I did a wheel allignemt again and found the rear right arm was completely free to move through its camber and toe adjustment.

This is obviously why it was a nightmare to drive. I was blaming the tyre pressures but this was it.

i ended up with

front: camber -2-4 range, set it at -2.5

castor +6.5

toe 2mm out each

swaybar at its stiffest

shocks at their stiffest

rear: camber -1.5

toe 4mm in each

swaybar in the middle

shocks at their stiffest

tyres at 28psi hot

So the car was amazing to drive. By far the best its ever been. No noticeable understeer or oversteer.

Eastern Creek has walls on every corner so pushing the limits isnt an option but i kept giving it more and it was taking it.

I cant wait to get back to wakefield where i can give it 110%

I ended up with a best time of 1.11.5.

I was consistently 5kmph slower than last time which i initially thought was the extra drag from the splitter, but the wind was howling back up the strait and several people mentioned they were way down on top speed too.

A few of the laps from the last session.

Next is SMP Long in a month.

Nothing really to do on the car, but i have just been diagnosed with TB and have been home quarantined for 3 weeks so im sue ill find plenty to fiddle with on it.

It might even turn 1 colour.... outrageous!

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I ended up getting a month of work.

It was sweet. There was nothing at all wrong with me but apparently i was contagious.

So i watched every game of the soccer world cup and played with the datto.

Its all 1 colour now.

SMP Brabham went ok but not as good as previous event.

The day started well but traction quickly went downhill.

I ended up with fastest 2.11.6 from the first session.

I finally pulled my finger out and bought a fire suit and HANS.

SMP GP last weekend.

Good fun day but still fastest session was still the first.

1.45.6

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Some of the competition

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Wakefield in a few weeks. Keen as

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Wakefield last weekend.

It was a great day out.

I had convinced myself that i have too much body roll going on.

So i had some thicker swaybars made up.

Now 20 rear adjustable 26 front adjustable.

They turned up last Thursday so i barely had time to throw them in and make some links to suit.

Anyway i set them both in the middle of adjustment and had the shocks set to hardest.

First session traction felt great but there was heaps of understeer. Best 1.06.0 - 1 sec off pb :)

i then tried to change the front bar to softest setting, but turns out i have to take the splitter off to do this and by the time i worked this out i didnt have time before next session.

So i just moved the front shocks to softest.

Noticeably less understeer, but still present. I didnt get a clean lap, with traffic holding me up west of 1.06.4.

I left the suspension as is for the rest of the day.

Next session 1.06.1 then 1.06.3 in the last.

Grip was pretty consistent all day but as usual couldnt beat my first session time.

First session:

Second session:

Third session

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At the last event at Wakefield last year the car started missing.

I thought it would just be a vac hose or something.

It turned into low compression so i pulled the motor and stripped it.

It was probably due for a freshen up anyway.

New rings and bearings. Turns out 4 of the inlet valves were totally worn.

So i put it all back in with new valves.

I took it to SMP GP a few weeks ago for a run in.

After the first session the timing belt snapped so i got my first ever ride home in a tow truck.

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It was raining + slicks = not much good

The timing belt snapped when it was idling so luckily no damage it seems.

Replaced that and back at SMP GP for R1 of this years supersprint.

I felt i didnt have any grip all day.

My fastest session was the first as usual 1.46.9

There was a presentation after for last year.

I was 3rd in Sports Sedans 2-4L

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Last November i also did a Targa High Country.

This was an awesome experience as a navigator in my uncles 73 911 RS.

Unfortunately we DNF from a cracked oil line.

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Hey mate just read this thread, it's so good to see a car evolve and get quicker (or slower)with each adjustment. It's inspirational.

1.06 at Wakefield. that's awesome.

My 1600 wonders all over the place doing 80ks can't imagine doing 200.

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Thanks

Going fast on the track is nothing like the street.

Track surface is so flat and smooth.

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