SupraSport billet head

This week we finished the final prototype of our billet head for #2jz engines. The head features two cam profiles, a short duration (advertised: 245 degrees) 8.25mm lift for idling and cruising and a long duration (advertised: 300 degrees) 13.25mm lift for high RPM and on-boost situations (2mm more than the current most aggressive cams available). This will allow your 2jz engine to idle and cruise like stock, have good fuel economy, enough vacuum, good exhaust gas velocity and pass emissions easily, while also being able to run very high horsepower.

To finish the broadest powerband possible we have optional dual #VVTi, intake from 2jz-vvti exhaust from 3sge beams. This is optional as some tuners would prefer less programming we can do fixed gears.

For more flow we are running a wider valve angle and bigger valves. The intake valves in OEM quality are 36mm (37mm for Supertech) and the exhaust valves are 32mm in OEM quality (33mm for #Supertech). That is +3mm on the intake and +4mm on the exhaust.

The head is made completely with OEM parts readily available at any company. The ports are all CNC matched and machined and we start with a billet chunk of new aluminium, not your 25 years old #Toyota casting.

The head has no buckets, valve lash is adjusted in 30 minutes with a screw driver like honda engines. We are 100% port compatible with the 2jz head so your intake and exhaust manifold will fit. For special racing applications we are able to do a straight port exhaust design, although the stock exhaust design is proven to 2000+HP already.

We will provide basemaps for any aftermarket engine management system (#ProEFI, #Link, #Haltech, #AEM) and even the older systems like AEM series 1 can control all functionality in this head.

If you are at the #Supra meeting in Las Vegas ask for Arnout and you can see this prototype in person! #SupraSport http://www.suprasport.nl

https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-xpt1/v/t1.0-9/14390850_1190470457708371_8245453237719439057_n.jpg?oh=bafcf0d2f8903fffed8f8a4972a5aac0&oe=5871404A&__gda__=1483319242_e27de01ba02cebe967a2dae205ac95c6

https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-xfp1/v/t1.0-9/14448934_1190470524375031_1540611932499467707_n.jpg?oh=f8996c53c1958e3a1099fecefec2fe3f&oe=58A95FE4&__gda__=1482717108_59d74b8214fafa710c9341c8154a8edf

https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-xfp1/v/t1.0-9/14355684_1190470564375027_4841022125588952687_n.jpg?oh=2e03cccd2f26bb3520b68d86995e57d4&oe=5875A361&__gda__=1483814449_cc04f85e3ba659ec04fa8b840e8c05f6

https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-xfp1/v/t1.0-9/14359005_1190470574375026_4413175346235359327_n.jpg?oh=7541929bc29d6b2be600a6ed99707805&oe=586A298A&__gda__=1483694298_034899a53570552001259de70cc45d4e

The response to our post about the new billet head we developed for #2jzgte was overwhelming. We received a lot of questions and we will answer these in the next couple of days. The head was photographed in detail at the Supra meeting in Las Vegas by David Tanner. We will use his pics to explain some of the details and considerations of the head.

In todays picture you see the billet camshaft and the rockers. We decided to make use of as many OEM parts as available so everyone can service our head. The rockers are the #Honda K20 rockers. You can buy these straight from the Honda dealer per set. As you can see the valve adjustment is done by a screw instead of shims. The camshaft profile can be custom selected, from already proven profiles for the K20 engine. We prefere to choose from this profile as the K20 has similar bore, stroke and rod length as the #2jz engine. We can supply or copy any profile you can come up with.

https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-xlf1/t31.0-8/s960x960/14435038_1195988400489910_3223749648048816839_o.jpg

On the next picture David Tanner made in Las Vegas you can see the coil we are using. The coil is the #Honda K20 / F20 unit. We had to go with this coil as it has a longer shaft than the 2jz coils. We will find a way to mount other coils also, but the first release will use the K20/F20 coils. On the #S2000 with turbo and supercharger we built earlier this year we are already making 800 rwhp with just 4 coils so 6 should be sufficient up to 1200 rwhp at least.

Furthermore in this picture you see one of the vvti solenoids, the other solenoid is on the exhaust side. These solenoids are the OEM #Toyota VVTi solenoids you find in the #JDM #2jz-gte as well as in the 2jz-ge with vvti that is in the IS300 and GS300.

https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-xap1/t31.0-8/s960x960/14524428_1196802503741833_4484126233361424540_o.jpg

Two pictures of the actual cooling of our billet 2jz-gte head, again made by Mr David Tanner. The head has a big area in the middle all around the sparkplugs and combustion chambres that is filled with water. Fresh water flows from the bottom (from the block) through the headgasket into this water collection chambre. The water gets heated up in the head and flows out at the front to the radiator. The holes to the side (call them steamholes), flow the water around the valve guides so these get sufficient cooling as well (very important). In total there is more water in our head than in the OEM 2jz head.

https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-xlp1/t31.0-8/s960x960/14481827_1198656060223144_7220135528108340975_o.jpg

https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-xpt1/t31.0-8/14445115_1198656056889811_6827200373424930304_o.jpg

Lovely idea and great to see this sort of thing being developed but dare I say unnecessary for 99% of Supra owners. I dread to think of the cost

Lovely idea and great to see this sort of thing being developed but dare I say unnecessary for 99% of Supra owners. I dread to think of the cost

I saw $15,000 on Facebook. Awesome piece of kit, but only for the very top tier cars.

I saw $15,000 on Facebook. Awesome piece of kit, but only for the very top tier cars.

My hondota has vtec brah, whould be good to see the end results with this

Would open up a pretty high rev range if it had the supporting mods.

Probably going to be used the most by drag racers so will be good to see how it performs over what is usually used

Nice engineering project

1. Rockers. Which why and how

We choose to go with the K20 rockers. We are actually using the K20 rockers, the honda K20 part no. We wanted to make use of as many OEM parts as possible because you can always choose to go aftermarket anyways by buying replacement parts. I didn't want to reinvent the wheel even if our wheel would roll better. K20 rockers / valvetrain has been proven well over 10k RPM with upgraded parts and are fine up to 8-9-10k RPM easily in stock configuration so these are perfect. Additionally the K20 shares similar bore as the 2jz (I think even exactly the same). This was important to place the valves on the right spot in the combustion chambre.

2. Valves. Which why and how

We first checked the K20 valves which are 35mm on the intake (36mm for K24) and 30mm on the exhaust (31mm for K24). We compared this against the 2jz (33.5mm on the intake and 29mm on the exhaust) which was already an upgrade. However the K20 valves are 5.5mm stem (not really a problem but 6mm stem is more solid) and more important the K20 valves were pretty short. If we were to make a K20 drivetrain on our head we had to convert the belt to a chain like the K20 as we needed smaller camgears. We looked into using the camgears for the B series for a moment, however you would have to change the drive wheel on the crankshaft as well. We took a B series crankgear, milled it out to the diameter of the nose of the 2jz crank and had hardly any material left. So this was a no-go. We needed to have the camshafts more apart to allow the camgears (stock 2jz camgears) to go on. We searched both the ferrea and the supertech catalog for an engine which had aprox. the same valve diameter as the K20, longer valves (aprox. 120mm long) and if possible 6mm stem. We ended up with some not very common subaru engine the EJ25 SOHC. Turned out the OEM type valves are sold cheap on ebay and Supertech makes replacements. At the moment Bottle from Titan is talking with Ferrea and they are making these valves as well except they are not listed in the catalogue. The OEM Subaru valves are 36mm x 6mm x 121mm on the intake and 31.5mm x 6mm x 122mm on the exhaust. The intake valves from Supertech are stainless steel 37mm x 6mm x 120.6mm and the exhaust are even inconel and are 33mm x 6mm x 121.7mm.

So to be precise:

OEM are:

36mm v.s. 33.5mm = +2.5mm intake

31.5mm v.s. 29mm = +2.5mm exhaust

Supertech are:

37mm v.s. 33.5mm = +3.5mm intake

33mm v.s. 29mm =+4mm exhaust

3. Valve angle

With the longer valves we could still not facilitate the camgears. We had to make the valve angle wider. This will also optimize the flow so that is a good thing. 2jz valve angle is 45 degrees, K20 is 50 degrees, our head is 55 degrees and B series heads are even 60 degrees, however these heads have problems with valves touching each other with very aggressive timing patterns and us having vvti on both sides we didn't want nor needed to go this high in valve angle.

4. Factory water neck

We just couldn't get that to fit plus it is in the way for large frame turbos. We made a small bypass unit there when thermostate is still closed. The main water outlet is now a tube at the front.

5. Height

With the wider valve angle the cams went a little bit down, with the added rockers they went up again. There was quite some room inside the 2jz valve covers which we don't need (ventilation chambre that can made differently) so all added (and subtracted) together we are aprox. 16mm higher. The exact height difference I will show later. We will clear hood and TRD strut tower etc.

6. Cam profiles

I am no pro at this. So I just copied what is currently out there. The K20 shares the same / similar bore, stroke and rod length as the 2jz. I took the Brian Crower K20 camshaft for turbo applications (BC0041-2) and copied that on the camshaft for the prototype. There are more camshaft profiles on the website of brian crower. We can mix and vary ourselves. The low cams are like 180 degrees and 8.25mm lift the high cams are like 13.25mm lift and 300 degrees. You won't be able to idle on the high cams with less than 2000RPM

7. VVTi

If you are tuning for power (what we all do) I strongly advice to tune the intake vvti at least. This will give you a lot more torque in the mid and even a little down low. The exhaust vvti is there to finish everything. You can make the engine cruise and idle a lot better with some slight exhaust vvti tuning. However if for whatever reason you want to call this head 'overkill' then I can only partly agree with you regarding exhaust VVTi. You might not need that. If you want a mechanical fuel pump, we can do fixed gear on the exhaust. So to all the vvti haters, sure, you don't need vvti on the exhaust but still you DO need it on the intake and it is a very nice have on the exhaust. Also I know for sure if you dont have vvti on the exhaust you would still want an adjustable gear on there, so why not just a gear that is controlled by the ECU.

The camgear is a modified Supra gear with the internals from the 3sge dual beams, so again OEM items for easy fix and replacement. The 3sge beams wheel didnt fit on directly as it has 2 less sprags than the supra one.

1. Will the valve covers be custom? What will be the finish?

Valve covers will be aluminum we can finish polished or anodized or powder coated. If you want custom engraving, sure.

2. Will there be a spark plug cover? What will be the finish?

Spark plug cover. Not at the moment

3. Will there be a lower timing cover? What will be the finish?

Lower timing cover. No. It fits on the lower timing cover. There will be an upper timing cover. Also billet aluminum with an O ring in the middle to seal the front hot pipe exit. We can make a lower timing cover to match the upper timing cover.

4. What leads you to believe the K20 coils will live long in the spark plug valley? This is an issue with the LSx coils.

K20 coils have been designed for this and works fine. I have not seen issues with these coils. We can modify for other coils if you want.

5. Are OEM Toyota coils an option?

We can consider that however the shaft is a lot deeper so we need to find a solution to extend the coils. It was easier to fit the K20 (F20 are the same) coils.

6. Will there be custom brackets to bolt down the coils?

No the coils bolt to the valve cover.

7. What wiring modifications are necessary from a stock USDM engine harness to accommodate the additional solenoids?

Two solenoids for vtec (you can switch intake and exhaust independant like the Nissan system works). Two VVTi solenoids. And the coils. We will provide the harness / housings and all with the head.

8. Does the stock fan shroud + radiator hose arrangement still fit? Or are users required to move to a non-stock setup?

Yes we will keep the stock fan. The stock fan is in most cases the best fan so not a good idea to get rid of it.

Headgasket will be stock or aftermarket. We have the same 'face' as the stock head so nothing different there.

Sounds amazing, when will you have a working prototype?

Sounds amazing, when will you have a working prototype?

 

/QUOTE]

Lol he wont have fa........like all the rest of his threads its all copied and pasted from the internet

 

 

Lol he wont have fa........like all the rest of his threads its all copied and pasted from the internet

 

/QUOTE]

Oh right, I thought he might have some direct involvement in the project. I have seen this on their website.

 

 

Tremendous though this is as a project, I think anyone buying this should expect to become part of the development process. I'd love to know more about the engineering behind it - and not just "we picked this part from here and that part from there and put them together". There really ought to be some serious number crunching behind something as complex as this.

Sounds amazing, when will you have a working prototype?

 

/QUOTE]

 

Its not me Arnout in Suprasport , he is putting it on the flow bench in the next 3-4 weeks , saw most of this on Suprasport facebook page

 

One of the biggest developments in 2JZ , taught members would be interested

Tremendous though this is as a project, I think anyone buying this should expect to become part of the development process. I'd love to know more about the engineering behind it - and not just "we picked this part from here and that part from there and put them together". There really ought to be some serious number crunching behind something as complex as this.

To be honest I am shocked somebody would put this level of development in the 2JZ, never-mind the financial cost , great to see what can be done ; one of the best engineering projects I have seen in a long time , as you said some Tremendous though gone into this

I wonder will they invest in a set of Kistler spark plugs

There are still people spending hundreds of thousands of £ on Supra builds across the world, they obviously think there's a market for it.