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Re: Shed clean out, few NOS parts
No life (a.k.a. DattoMaster)
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Id be interested in the Ute diff center. Ill send you a PM. Ta

Posted on: 11/9 21:02
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Re: Engine choices: E15, Supercharged A15 or SR20DE
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Pm sent

Posted on: 12/11 5:38
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Re: Engine choices: E15, Supercharged A15 or SR20DE
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Ask away! I'm serious about the offer too!

D, It was a healthy SR16VE N1. Good enough to win the U1600 class at the Nationals 4 weeks ago anyway. And I only tuned it the week before that.

Posted on: 12/11 3:14
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Re: Engine choices: E15, Supercharged A15 or SR20DE
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D, The SR16VE was an N1 engine, so I've updated the post to show that.

Tom, It probably all depends on if you like to just be out on the track and having fun reliably, In which case a STD SR would be hard to beat for that(as others have said). The Turbo A12 would be faster not just in a straight line, but in the corners and under brakes. I'm confident in the A12a turbo being reliable at 15Psi on E85.
I certainly didn't mean to put any pressure on your decision making. I just love the A12T (done properly(disclamer,lol))

Posted on: 12/11 0:41

Edited by sikyne on 2018/12/11 1:09:10
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Re: Engine choices: E15, Supercharged A15 or SR20DE
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Tom, I understand that it would be a daunting task to take on and that it may be easier for you to put an SR20 in the car. But I believe in the turbo A12 so much i'm happy to help it happen.

What if I build a turbo EFI kit, fly over, fit and tune it for you within your budget?

Posted on: 12/10 22:26
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Re: Engine choices: E15, Supercharged A15 or SR20DE
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Regarding the belt driven option, Unless its a later screw charger, they are not as efficient. The drive losses are also significant. Because they are positive displacement chargers they make boost from low down, which is great for the street but can be prone to detonation low down without dropping comp or pulling ign timing. Then at high rpm the losses start adding up.

I like that with turbos, you can size them to start working from higher in the rpm(say 4-4.5k), This makes them efficient at higher rpm and Boost is higher than ex manifold pressure. Also you can control boost to maintain a flat torque curve for linear power delivery within driveline limits. Eg, if your gearbox is rated to 150 ft lb, you can add boost until you are at 140ft lb then add more when the torque would normally fall off to maintain the 140ft lb.
So the boost could be at 16psi at 4500 back to 13psi at 5500 then tapering up to 17psi at 7500

Posted on: 12/10 6:50

Edited by sikyne on 2018/12/10 8:19:54
Edited by sikyne on 2018/12/10 8:20:49
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Re: Engine choices: E15, Supercharged A15 or SR20DE
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Hi Tom,
I have never had a failure using cast pistons, but changed to forged as a precaution once I was consistently making over 220Hp atw. I have done a few pulls on the dyno at over 30psi on cast pistons, but wouldnt want to run at that boost over a race with the std pistons in it.
The fresh A12 will be fine for boost. Though I do like to run about .018 (.006/1 of bore diam)ring end gap when turbocharging an A12. For 15Psi you will get away with a tighter ring end gap than that.
Is the A12a all standard? ie, round port head, cam, springs etc.

Do you have acces to a workshop and a eddy current dyno?

Posted on: 12/10 5:36
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Re: Engine choices: E15, Supercharged A15 or SR20DE
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The Turbocharged standard A12 makes more power than all the Standard 2Lts engine options and is lighter. But you would have to balance up the fabrication time differences between fitting an SR and making the bits for the turbo A12. Both options will need new Exhausts, wiring, fuel systems, upgraded cooling systems etc.

I like the idea of you going with a low boosted stock A12 to start with. You will get away with the gearbox and tail shaft you are currently running. You wont need to run an intercooler at low boost and the radiator you have may be up to the task.

The car will still be light and balanced with little increase in weight over the front. The value of this should not be underestimated.

If the standard cam is retarded about 4-8 degrees, Peak power will be at around 72000Rpm and less boost will be require to make the power(taking the stress off the gearbox and clutch).

This combo running 15Psi and E85 will make 140-150Hp atw and wont need an intercooler. It would be a faster car(even initially) than having an SR in there making more power.

The other advantage is that extra power can be added as clutches and gearboxes are upgraded and an IC added over the years, with the potential to make more power than ANY NA 2 Lts can make.

Posted on: 12/8 23:29
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Re: Engine choices: E15, Supercharged A15 or SR20DE
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Hi Tom,

These are some figures from my Dyno.

-SR20DE STD(Pulsar Challenge cars, standard ECU, wiring AFM etc) 125-135Hp atw at 6900rpm

-SR16VE N1 STD 130-140 Hp atw at 8400Rpm

-SR20VE Built for Circuit 200Hp atw at 8200rpm

-A12 STD Long motor and inlet manifold. Budget single injector EFI conversion, log turbo manifold. -180Hp atw


The best 2Lts engines in Australia make 240Hp atw and these include Honda K and B series, 3SGE and SR20VE, with the SR20VE being slightly higher than the others.



I would not recommend a belt driven supercharger on a circuit car unless it was used for Auto X or motokana.

Posted on: 12/8 22:08

Edited by sikyne on 2018/12/8 22:29:49
Edited by sikyne on 2018/12/8 22:48:07
Edited by sikyne on 2018/12/8 22:57:45
Edited by sikyne on 2018/12/11 0:27:50
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Re: HAVE YOU GOT A DIFF FOR ME ??
No life (a.k.a. DattoMaster)
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Hi Bob, Swap for a 4.4:1?

Posted on: 2018/11/15 12:54
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