Jump to content
  • Announcements

    • fly by

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

      We set out to establish Datnet in the late '90s to provide the best Nissan-Datsun online resource, we don't plan to ever stray from that. Huge updates site-wide to make your experience the best it can be. Stay around, read, post and enjoy - when your done you can go back to Facebook and 'like' us there too: datnet.org on Facebook
dat14u

1968 Ca18Det 510

Recommended Posts

UPDTATE

Drove home from the nats and pulled the brakes apart after they died an unknown death.

Rebuilt all the callipers and master.

Put some 290mm rotors on the rear and new rb74 pads.

Put it all back together after a little issue priming the master.

Went to dyno day........

Im after some thoughts on this.

My car went from a gt28r making about 220kw to a 2871r making 180kw.

Before it was:

fresh forged ca18det

gt28r@18psi

e85

nistune

248 cam on inlet

720cc

rb20 maf

etc

I pulled the motor apart and bought some new bits:

gt2871r .64 52t

1000cc

z32 maf

4xls1 coils

I tuned the car myself and sure i dont know what im doing but it went pretty well with the gt28r.

i ran 117mph at the drags which is worth 220kw+ in my car.

Since fitting the new bits it hasnt felt as strong, or at best equally as strong on the road.

At the dyno day it made 230hp@21psi.

The timing map was similar on both, slightly rescaled and fuel was 11.8 - 12.2 under load to redline.

The car currently runs and drives fine, just doeasnt pull as hard as it should.

Ive triple chacked the cam timing and boost leaks.

Any thoughts?

Share this post


Link to post
Share on other sites

UPDTATE

Drove home from the nats and pulled the brakes apart after they died an unknown death.

Rebuilt all the callipers and master.

Put some 290mm rotors on the rear and new rb74 pads.

Put it all back together after a little issue priming the master.

Went to dyno day........

Im after some thoughts on this.

My car went from a gt28r making about 220kw to a 2871r making 180kw.

Before it was:

fresh forged ca18det

gt28r@18psi

e85

nistune

248 cam on inlet

720cc

rb20 maf

etc

I pulled the motor apart and bought some new bits:

gt2871r .64 52t

1000cc

z32 maf

4xls1 coils

I tuned the car myself and sure i dont know what im doing but it went pretty well with the gt28r.

i ran 117mph at the drags which is worth 220kw+ in my car.

Since fitting the new bits it hasnt felt as strong, or at best equally as strong on the road.

At the dyno day it made 230hp@21psi.

The timing map was similar on both, slightly rescaled and fuel was 11.8 - 12.2 under load to redline.

The car currently runs and drives fine, just doeasnt pull as hard as it should.

Ive triple chacked the cam timing and boost leaks.

Any thoughts?

Check simple things first.

What sort of ignition timing are you giving it

Maybe do a comp test and or leakdown test.

Did you replaced valve-springs ?

Is that the same spec turbo as shoey?

Share this post


Link to post
Share on other sites

Problem solved.

Have a read if your bored.

http://www.nissansilvia.com/forums/index.php?showtopic=499161&st=0&gopid=6306211&

Explains why i was 2 sec slow at the nats too i guess.

TCC track day will have the answers....

Geez mr peters, the keyboard warriors were quick to jump to conclusions.. Gotta remember, they drive nissans.. prob get stuck changing their oil filters..

hope you've got it sorted now ..

Share this post


Link to post
Share on other sites

Another quick update.

Car is pulling hard after the closed butterfly incident...

I made a fibreglass heat shield for the air filter and a mesh headlight replacement.

All is looking good for Sunday at Wakefield.

post-894-0-67779300-1313125733_thumb.jpg

Mesh headlight

post-894-0-15160600-1313125761_thumb.jpg

Heat shield

post-894-0-31656300-1313125837_thumb.jpg

New coils

post-894-0-54916100-1313125861_thumb.jpg

Home flare job

post-894-0-43848000-1313125867_thumb.jpg

post-894-0-58465000-1313125816_thumb.jpg

Share this post


Link to post
Share on other sites

Looks good mate, Good luck on Sunday,

Share this post


Link to post
Share on other sites

Another update...

Had the day off work as its my bday. What better way to spend it than in the western suburbs of Sydney playing with the dat... back up a few weeks...

So day before racing at wakefield i put a cage in i won off ebay. Turns out Mr Shoesmith was the seller...

post-894-0-86867600-1314343756_thumb.jpgpost-894-0-50460300-1314343787_thumb.jpgNote the new set of rubber...

It is a 6 point but i didnt put the front legs in yet.

Anyway track day was awesome. Car was running well. 18psi was about the limit of traction in 3rd when tuning on Sat so thats what i ran at.

Car was double entered by my uncle also.

Had 1 little incident that made the tyre grab the guard.. this:

caused this:

post-894-0-35925700-1314344028_thumb.jpgpost-894-0-80019900-1314344045_thumb.jpg

You get that.

Ended up 7th of 80 which was pretty sweet.

http://www.natsoft.c...08/2011.WAKE.SS

I felt the car had a bit more in it but the times didnt come down. Stoked with 9's though.

Few more vids..

Back to today..

Considered panelbeating the front guard, but obviously it wasnt flared quite enough, which means if i did it properly this time i would have to re-do the LHS guard. Fuck that. Im looking at some flared fibreglass ones from alfa.

So in having a look over the car i came across this..

post-894-0-92301300-1314344415_thumb.jpg

How the hell can that happen. That was a new boot when i put the cv's in a few years ago. There is nothing to fowl on???

The front brake pads are also almost gone. They were about 60% before Wakefield, i guess the extra little bit of speed to wipe off and 2 times the laps took their toll.

So replacing brake pads seems like boring loser stuff to me, so i pulled the trusty wilwood callipers that the ebay fairy brought me out of the cupboard and grabbed the old school ruler and did a few measurements.

It looks like the new setup will be floating disk so i can run a set of rotors and generic pads for the street, then undo the callipers and replace the rotors with a new set and track only pads for the track.

New rotors will be 320x30 and will fit under my 15's!!!

New calliipers Wilwood 4x44mm piston to replace Mazda 4x36mm piston.

But wait there more, proper Demtel style.....

The brakes will be put on the back burner after i break a few gearboxes with these babies..

post-894-0-36620700-1314345303_thumb.jpgpost-894-0-50771700-1314345311_thumb.jpgpost-894-0-56781400-1314346045_thumb.jpg

  • Like 1

Share this post


Link to post
Share on other sites

Nice work Mr Pierre's! Hey pretty sure those rear legs of the cage are meant to go into the outer corners of the parcel shelf - ie not centre.

And get the drag radials out!!!

Share this post


Link to post
Share on other sites

They are not strait for some reason. Its either outer edge on the hoop as it is now and in the middle on the shelf, or at the edges of the shelf and middle of the hoop. Neither is ideal me thinks

Share this post


Link to post
Share on other sites

Great times Peters, well done"mate, great job, 1.09s

Go the datto 1600, Thats the quickest 1600 time that I know of amongst all the guys I know racing ,

Share this post


Link to post
Share on other sites

Went out to the drags this week.

Nice clear night, got 5 runs in.

Was pretty confident of hitting mid 11's with the M/T's.

Was running 22psi all night, didnt touch a thing in the engine bay.

18psi tyre pressure.

Ended up struggling but got there in the end.

1st run i forgot how quick it was going to get through 1st and hit the limiter. Still got pretty close.

12.009@ 120.56 1.895 60'

2nd run didnt give it enough and bogged right down off the line, almost stalled.

12.740@ 116.98 2.479

3rd run same as lastgave it a bit more ~5000 but still bogged way down.

12.424@ 121.90 2.291

4th run tried riding the clutch a bit more off the line but still no good. Hit the limiter in 3rd too.

12.034@ 120.90 2.026

last run thinking i was going to miss out on 11's. dialed up about 6500, got off it pretty hard. Shifted 3-4th a bit early and just missed boost for a split second.

11.544@ 122.39 1.767

post-894-0-41538200-1316214508_thumb.jpg

Im thinking ill give it another crack, i reckon there is a bit more in the 60' and ill wind the boost up a bit.

11.3's????

or broken gearbox????

Share this post


Link to post
Share on other sites

You are faster................for now

went 11.683@ 123.78mph 1.830 on low boost (18psi)

run as high as 125mph

then snapped a cv spline

Share this post


Link to post
Share on other sites

Went back out to the drags on 5/10 day.

Nice night, got 6 runs in.

18.3@75

11.9@122

11.3@123

11.5@121

12.0@120

13.5@82

post-894-0-33402800-1318924448_thumb.jpgpost-894-0-56948200-1318924459_thumb.jpgpost-894-0-03709000-1318924464_thumb.jpgpost-894-0-72085000-1318924466_thumb.jpgpost-894-0-91609800-1318924468_thumb.jpg

Also did some work on the roll cage mount at the rear.

I ran a strip of 50x3 across the top of the rear shelf, and the same below it with 20x20 RSS attached then welded it all in with a few braces to the shock mounts.

I also included anchor points for a harness.

post-894-0-96059700-1318924110_thumb.jpgpost-894-0-75456300-1318924115_thumb.jpg

I also masacred the front guards and welded on some flares.

post-894-0-61652300-1318924128_thumb.jpgpost-894-0-36290500-1318924131_thumb.jpg

  • Like 1

Share this post


Link to post
Share on other sites

Nice work Peters,

Share this post


Link to post
Share on other sites

Been a while between posts.

Since last post the car sat for 3 months.

In that time i pulled the front brakes off and got stuck into a new setup.

Ended up with Mazda 3 mps 320x25 rotors.

post-894-0-65807000-1338802355_thumb.jpgpost-894-0-39705600-1338802408_thumb.jpg

post-894-0-41293400-1338802458_thumb.jpgpost-894-0-90827300-1338802504_thumb.jpg

Plan was to run a set of race only pads and rotors at the track then another set of rotors with street pads. Race pads were Wilwood 'A' compound.

Once i got the brakes done i drove the car to work each day for a few weeks.

The brakes felt really good at street speeds.

I was running around town on 12psi.

One day i put some 260 8.8 cams in that have been sitting on the shelf for 6 months.

Fiddled with the tune a bit and cam timing on the inlet side. No idea what it ended up at. No marks on the DIY cam gears.... Felt better than pre swap though.

The day before TCC supersprint i planned to set up a microswitch on 2nd gear to switch a solenoid for lower boost control. i.e. traction control...

Problem: when i turned up the boost the car was missing at anything above 15psi.

I hadnt really boosted it hard since running 22psi at the drags 6 months ago.

It wasnt leaning out at all. I dropped the plug gap to 0.65mm.

This got me to about 17psi before it would break down.

By the time i had worked out gapping down helped the shops were closed. No new plugs for me.

Owell, it felt pretty strong on 16psi so i left it at that, with 2nd gear switched to 13psi.

Pre scruteneering i swapped over the rotors and race pads. Did a few ~100 - 0 stops on the road out the front then hit the track. First lap was still bedding in but was starting to feel very good, braking later than usual.

By the end of the session i could not control the front lockup. tTe line between good braking and lockup was too fine.

Next session was no better, went for a trip to the sandpit at the end of the strait. Had to be towed out at the end of the session.

Next session had massive brake shudder so wasnt much good. Went in and changed the front right rotor. Must have warped with hot pads in the sandpit.

Next session braking was still an issue, lockup or overshoot...

All the while the car felt very strong, tyres were holding on awesome, could boost out of corners in 2nd...

For the last session I put the street pads in, which were RDA $30 jobs.

They cooked after 1 lap but at least I could stand on them and feel confident that it wouldn’t lock up. I was braking way way early. Did my fastest lap for the day on cooked brakes.

http://www.natsoft.c...05/2012.WAKE.SS

Today i got around to looking into the breakdown issue. Didnt have to look very far. Put a new set of plugs in... 24psi... sweet. Car doesnt stop though, still got cooked pads in there.

Plan is to get some higher coefficient friction pads for the rear and some lower ones for the front that can handle the heat and mix and match to get some good braking back.

Before thats required bring on the DUD drag day in a few weeks...

  • Like 1

Share this post


Link to post
Share on other sites

Little update.

I have been out to the drags 3 times in the last few month.

I set the rear end up to sit pretty high using KDRL-02 springs. I think they are about 760 pounds.

I set the rear camber to +1.

First pass with this setup i ran 1.69 60' - my best to date - but missed 3rd. 11.6@121

From then on i have had clutch issues off the line.

i managed an 11.3@122.9 first pass at the 2nd DUD Sunday. 1.75 60'.

Last time out i had 8 passes with a best of 11.7@124. 2.0 60' and 11.9@125.4 2.2 60'.

Before this i played with the cam timing. I was basing it on the TP load in Nistune.

I figure the higher the load the more power its making. Not sure if this is true.

I picked up 2mph so must have some truth.

An interesting note is the final tune i went with had a max load of 125 dropping off to about 118 at 7000.

I logged the runs at the drags for the first time ever and the max load was 112 dropping off to about 100.

The heat sink of sitting in the staging lanes must make a decent difference.

When i turn the boost down to max 112 load the car feels like a snail after driving it at 125.

Ill get it onto a dyno 1 day and see whats actually happening.

The clutch has lost all its bite off the line and slips.

It still holds up with the circuit semi's so it wont be replaced until something blows up.

I think for now i am retired from the drags.

Off to WP again in a few weeks for the Classic Skyline Nationals track day.

Hoping to have the brakes sorted and smash some big $$ skylines

Share this post


Link to post
Share on other sites

Little update.

I have been out to the drags 3 times in the last few month.

I set the rear end up to sit pretty high using KDRL-02 springs. I think they are about 760 pounds.

I set the rear camber to +1.

First pass with this setup i ran 1.69 60' - my best to date - but missed 3rd. 11.6@121

From then on i have had clutch issues off the line.

i managed an 11.3@122.9 first pass at the 2nd DUD Sunday. 1.75 60'.

Last time out i had 8 passes with a best of 11.7@124. 2.0 60' and 11.9@125.4 2.2 60'.

Before this i played with the cam timing. I was basing it on the TP load in Nistune.

I figure the higher the load the more power its making. Not sure if this is true.

I picked up 2mph so must have some truth.

An interesting note is the final tune i went with had a max load of 125 dropping off to about 118 at 7000.

I logged the runs at the drags for the first time ever and the max load was 112 dropping off to about 100.

The heat sink of sitting in the staging lanes must make a decent difference.

When i turn the boost down to max 112 load the car feels like a snail after driving it at 125.

Ill get it onto a dyno 1 day and see whats actually happening.

The clutch has lost all its bite off the line and slips.

It still holds up with the circuit semi's so it wont be replaced until something blows up.

I think for now i am retired from the drags.

Off to WP again in a few weeks for the Classic Skyline Nationals track day.

Hoping to have the brakes sorted and smash some big $$ skylines

Noice work there Mr Peters.. an inspiration to the DIY'ers !!!!

Share this post


Link to post
Share on other sites

Nice times/ work Andrew,

Have fun down at the Syline nationals, ( just can't make it that weekend, )

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Recently Browsing   0 members

    No registered users viewing this page.


Dish service areas


×