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#21 Spiff

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Posted 05 November 2017 - 10:51 AM

Well, results are in; my tired old Z20E+T made a best run of 167.8hp at the wheels at 0.6bar boost(8.7psi) today. Estimated 200.1hp to the crank. I'm well pleased with that.
Video link of one of the Dyno runs will be up when I get it uploaded to YouTube ☺️

#22 Spiff

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Posted 05 November 2017 - 11:37 AM



#23 datzenmike

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Posted 05 November 2017 - 12:21 PM

Can't read the numbers. I've seen spinning tires before.


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#24 Nathyne

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Posted 05 November 2017 - 02:03 PM

Nice Spiff! How did you adapt the SR20 CAS to the z24? I am holding off on ordering pistons for a little while as my rb26 is just getting finished up at the shop (melted a piston at 492whp two injectors were found to be out of spec) and there was some surprise head work with leaky valves. Once its all back and there are no more surprises I will start ordering parts. For now I am going to start on cleaning up the head, lapping valves and seeing if there are any casting lines I can knock down in the ports.

 

 

Picture of my head just because, hopefully my spring compressor shows up soon!

z22_head.jpg

 

 

 

Edit:

Realizing now that I am going to need to look into higher compression pistons as with a 57cc z22 head it will lower it too much. Was under the impression my z22 head was the 45cc but that is only z20s i believe. Will need to cc it once it is all cleaned up to be sure.



#25 datzenmike

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Posted 05 November 2017 - 02:27 PM

See post #18.

 

You need the Mileage Option head (casting #W04) from the '83-'86.5 720. These are the 45 to 47cc combustion chamber heads. This one...

 

pGouIVP.jpg

 

Notice the quench areas top and bottom.


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#26 Spiff

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Posted 05 November 2017 - 11:35 PM

Can't read the numbers. I've seen spinning tires before.

 

You saying it isn't true? I'll post the print when I get it, I only have a screenshot of it right now.

 

Nice Spiff! How did you adapt the SR20 CAS to the z24? 

 

I removed the cam gear from the sr20 cas axle and cut a offset notch at the bottom of the axle to match the oil pump shaft. Then I designed a new pedestal for it in fusion360 and had it 3d printed in nylon.

https://www.instagra...en-by=sand_sjol



#27 datzenmike

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Posted 06 November 2017 - 06:06 AM

You saying it isn't true? I'll post the print when I get it, I only have a screenshot of it right now.

 

 

 

 

 

Absolutely not!!! Would love to see the numbers for this. The vid doesn't show anything really just the car. I'm curious about what power is made at all the RPMs.


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#28 Lockleaf

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Posted 06 November 2017 - 08:27 AM

Very impressive gains compared to the turbodatsun.com build. Less displacement, only slightly more boost, much better power at that boost level.

Half Pint ('71 510 Goon) http://community.rat...agon/p?=1269361

 

Audrey ('69 Roadster 1600) http://community.rat...rey-the-ratster

 

Tiny Havok ('85 720 DIY built Crewcab 4x4) http://community.rat...ache/?p=1395455

 

720 Shenanigans http://community.rat...20-shenanigans/


#29 Spiff

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Posted 06 November 2017 - 10:47 AM

Absolutely not!!! Would love to see the numbers for this. The vid doesn't show anything really just the car. I'm curious about what power is made at all the RPMs.

 

 

Probably misunderstood you then. Graph of the final run is coming as soon as I get the email. I have this photo I took of an earlier run though. A bit blurry but I believe it says 163.9

Power peaks just over 5000, very linear power delivery. Click this link for image: https://photos.app.g...t3zEfr9SceVWpF2 I haven't found me a photobucket alternative yet

 

 

Very impressive gains compared to the turbodatsun.com build. Less displacement, only slightly more boost, much better power at that boost level.

 

Well, It's almost winter here so the cooler air definately helps, I believe his build was seeing some 70 degrees celsius intake temps and I'm at around 30-40 at max. Also I have the advantage of running tuneable efi I guess. 

What I can't understand is how that turbodatsun build haven't blown up? As far as I could see he didn't do anything other than retard the base timing to 0 degrees, that's like 20-25degrees all in? 

My engine was knocking like crazy even at 17degrees under boost and we had to pull so much timing in that area that we ended up actually loosing some hp compared to our initial runs...



#30 datzenmike

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Posted 06 November 2017 - 12:22 PM

Odd graph. I assume blue= torque and red is HP? Torque is always less than HP above 5252 RPMs and higher torque below it. 

 

 

HP = TORQUE X RPM /5252

 

At 4000 it shows 225 torque which works out to 171 HP but it shows about 125 HP so the torque line is too high


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#31 Lockleaf

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Posted 06 November 2017 - 06:06 PM

You're running coil packs correct? No longer the distributor?

Half Pint ('71 510 Goon) http://community.rat...agon/p?=1269361

 

Audrey ('69 Roadster 1600) http://community.rat...rey-the-ratster

 

Tiny Havok ('85 720 DIY built Crewcab 4x4) http://community.rat...ache/?p=1395455

 

720 Shenanigans http://community.rat...20-shenanigans/


#32 Spiff

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Posted 06 November 2017 - 06:51 PM

Yeah I'm running Toyota yaris coils