76er Swallowtail K-Jet turbo build

[Oneofthegreats]

Well after Preeny came down & drove this around alittle bit.

We sat down, had some drinks & threw some ideas around about the tune & how to improve & fine tune it. Cause after the boost regulator unscrewed & boost regulator hose split, it threw the tune way out & I just couldn't find the old tune again.

So I thought I'd give a few of the idea's a try & play around with them.

First off, I cleaned the K&N air filter which hadn't been cleaned since I built the car. So more or less 50+K!!!!! To say it was black & chocka block with dirt is an understatement. I've seen cleaner filters in vacuum cleaners!

Then replaced the fuel filter too.

Then onto refitting both the tuning equipment, being the Boost gauge & Air/Fuel Meter Gauge.

I started off repairing one of the cyl. head plastic fitting's that broke after a backfire yesterday which was basically the start of whole process of playing around with the tune.

I removed the Hobbs adjustable pressure switch for the Aux. injectors (cold start valves) & bench tested & then readjusted it from a 7psi cut in to 13psi cut in.

So when it hits the magical 13psi mark the extra injectors cut in & supply extra fuel on boost. Instead of dumping fuel in earlier at 7psi. Now it has a fair amount of extra air volume before dumping in extra fuel.

Then I readjusted the system pressure of the K-Jet system. I reshimmed up the system pressure regulator from 82psi to 94psi.

Then redjusted the ignition timing to approx 10BTDC.

Reset the Air/Fuel mixute at idle to approx. low 14's/high 13's:1 & seemed very happy.

The onto the R/test to reset the boost regulator. This took several start/stops to get it right. As when bench testing it, you don't get the same volume of air from the turbo as you would from 60 gallon air compressor tank.

After alot of R/testing & playing around, I ended up with it set at 20psi & adjusted the timing retard to approx 1.5 degrees per pound of boost.

With these few changes, the car has now come alive.

It certainly doesn't have the same amount of kick it did, but now it doesn't have any stutter or fuel dump at all. It will pull cleanly in all gears with a nice smooth surge & then when it hits 4K the surge gets greater!

So you can cruise along in 4th@100km/h, plant it & without any stuttering, it can (let your imagination take over).

Now it doesn't wheel spin like it did & makes bugger all boost in 1st due to not building up enough engine load, but in 2nd it will boost & turn the tyres, hook up & away you go, 3rd & 4th come about very fast!

If you in 3rd at 60, it will also squeal the tyres on hot mix & pull nice & smoothly past the legal speed limit.


So overall. Even though the car isn't as fast as it was or turn the tyres as violently as it did , its feels only a fraction slower & it's a much nicer & heaps easier car to drive. Which is also pretty bloody fast.

Big round of applause to Preeny! Without the booze he's useless! haha

P.S. but it wasn't all him!

[GoLfMan]

good to hear you've sorted it mate

now I need to have another ride in it!

[DubSteve]

After being in the car the other week, anyone can ask Tim the laughs I had with this car with just the sheer awesomeness that comes out of it! A pure sleeper I love it!

[Jarred]

You still owe me a drive!

Glad to hear you have refined the tune though.

[Preen59]

Great stuff, Tim! Glad to hear you got it all sorted.


PS.. The invoice is in the mail mate. hahahaha.

[velly_16v_cab]

great result guys, i will pop around for a blast some day soon tim

[gldgti]

sounds brilliant. we need a private server for video hosting

[Oneofthegreats]

Ok. Alittle update.

The car has now done 20K on the turbo setup & all has been going well until last Fri. night when the gearbox decided to start making some unusual noises which were more prominent in 2nd gear. (this is the powerskid gear, so it copes all of the abuse I dish out to it!)

I thought. Bugger it & I'll keep driving it. Whats the worst that can happen? right?

So I've been bumming around in it for the last couple of days & with a last minute decision to head upto the VW Jamboree, I was off with gearbox noise in tow.

By the time I finally got to the park, the car was making a loud enough racket that I could hear it over the engine especially in 2nd gear! Even with light taking off & babying it ,it was noisy as hell. You could even just have it idling away in neutral & it was noisy.

So after the show, we heading back to Waterboys house for a catch up & once again we were off. Well by the time I got into Melb. people were actually taking notice at how loud the noise had become in traffic! haha

But I pushed on (more like babied on!) for the 2 hour drive & finally made it into my driveway where on arrival it went ""BANG""

It locked up in 1st gear & had no drive what so ever. The noise in neutral & idle is unbelievable! Just full of bearing & crunching noises! Lucky it didn't punch any holes in the casing either. But by the sounds of it, I reckon its junk!


So I'll bang in the ever trusty diesel 4spd which I always rely on in need which has never let me down.



that is until I push god knows how much power though it! Only time will tell.

I'd post up a vid of it idling away, but I have no idea how to upload vids off the camera & they are bloody massive files too!

[Golf Loon]

Thats Gold that the old girl got you home, then died on the driveway.

I have some great TDI 020 boxes that have awesome ratios for what you are doing with it and are strong enough to hold the power. Hit me up if you feel the need.

[Oneofthegreats]

Thats Gold that the old girl got you home, then died on the driveway.

I have some great TDI 020 boxes that have awesome ratios for what you are doing with it and are strong enough to hold the power. Hit me up if you feel the need.

Thanks Matt!

Your right about getting me home & then dieing!

It broke a clutch cable last Wed. in peak hour Melb Westgate traffic & I had to nurse it over to St Kilda for a important meeting & then had to get over to Essendon through the city to replace it!
I could only manage just a tiny amount of clutch for takeoff only & had to go clutchless the rest of the trips. The pedal sank to the floor as usual!
When I removed & inspected it was fried to the max & only was holding together by 2 strands!

I reckon I've replaced more clutch cables & components in Mk1s than I have replaced brake pads, discs & also any light globe in a mk1! They are bloody terrible! But that's the joys of running a heavy duty clutch!

I'll definitely keep this in mind, but I reckon the TDI boxes may put alittle too much load on very tired old engine under long periods of boost.
I'm not really into crazy long ratios or top speed.


You can only do 100, but its more about how fast you can get there, or turn the tyres trying! haha.




I might just try the stock old 4 spd for the time being, as I'd really like to hopefully get some sort of movement on the custom auto build up