[Aus335iguy]

Loving how neat it looks already…

[Brule]

Just seen that you are going to re use the efr 7670.

It is severe a choke point.

You will gain hp in all areas if you go up one or two sizes.

For example look at this video with a 2jz a g30 comparing to a g35 frame turbo.
Not an efr but efr7670 is even smaller then g30 770.

Link ofvideo

My precision 6466 setup makes 300kw at 3600rpm. 400kw by 4200rpm and that would be even more through a manual transmission. 914nm at 4000rpm too.

BW7670 is to small for a 3L engine.

[jzx_andy]

Originally Posted by Brule

Just seen that you are going to re use the efr 7670.

It is severe a choke point.

You will gain hp in all areas if you go up one or two sizes.

For example look at this video with a 2jz a g30 comparing to a g35 frame turbo.
Not an efr but efr7670 is even smaller then g30 770.

BW7670 is to small for a 3L engine.

I agree with this broadly. You are limiting things with such a small turbo and will need to run a fairly high boost pressure to get it making the sort of crank hp it's rated for, and even then, it'll likely spool too quickly for the stock N54 rods to take it well, in which case you'd be tuning out a lot of the potential low-end torque (which I understand is the entire point of going small turbo) just to keep an unopened N54 holding together.

62-68ish mm wheel turbos with the right rear housing are a good fit for a N54 if going down the usual ST path IMO. I'd only consider going smaller if you are missing two or more of these things with an ST setup:

- twin scroll manifold + rear housing
- e85
- ball bearing CHRA

If I'm not mistaken, you have all of the above things with your setup Socks, plus the overall lighter rotating assembly that a baller EFR turbos offers over Garrett and Precision units.

If anything, I'd say each of these things put together make a compelling argument to go for a 900-1100hp rated turbo. You might not use such a turbo to it's full potential at peak power, but you certainly will be maximising it at lower rpm's, spool will still be fantastic, and you won't have to go bigger if you end up chasing more power or (touch wood) the motor lets go and you end up going built N54, in which case you might as well send 30+ psi through a turbo and make real power.

If you're on the fence, now's the time to bite the bullet and go for a bigger snail. Otherwise, just fuckin' send it! Lol.

[Socket]

Thanks for the suggestions guys.... but not looking for more top end
I spend 99% of the time city driving, so low end response is more important to me then top end and that's where the 7670 excels. Spools up almost as quick as stockies but doesn't run out of puff at 5000 rpm like twins do. Agree would be nice to have a monster turbo under the hood but 350-380 kw is more then plenty for me

[Socket]

MOD 135 - CONT
Work continues on the bottom mount. This week is fabrication of the exhaust manifold pipework to the turbo.... Measure, cut, test fit, cut, measure, test fit again, tack weld, measure, cut.... Custom work is so time consuming. Lucky for me, Vince is doing 99% of the work. And doing a great job.. I mean just look at those bevels and welds

[vtl]

Thought id chime in and fill in some pics of the build process

Have completed a very similar low mount single over the last year with a g35-1050 clone (Pulsar) turned out quite nice and was very happy with the result. The top mount on SPCGRY has always been a bit of a messy setup and it is really great to finally have the skills to make it how we originally would have wanted it to be.

Turns out theres plenty of room for a low mount, and I am puzzled as to why there hasn't been kits released for RHD. The 1050 is quite a large turbo and have found the EFR was a lot easier to fit in the same space. A Garret G30-770 would probably be the ideal size for someone wanting to stay on direct injection and run on a Helix pump

The goals were to have a nice fitting low mount setup that focused on good fitment and ease of fabrication rather than trying to make it complicated and fancy. After a lot of thinking a single scroll low mount setup log manifold was decided on. IMO, if you have long runners where the bank lengths are not that equal (the current top mount setup on SPCGRY) theres probably not much benefit to staying with twin scroll.

First stage is to get the log manifold started, which the parts all fabricated off that. Buttweld tees were used which simplify the fabrication process, but since the manifold spacing is closer together than the manifold ports, they have to be cut and rebevelled. This is simple in theory but can be a bit tricky to get right as the cast parts are not that uniform, and when tacked together the parts can move, resulting in poor fitment.

The manifold flange that was used was the RB one, I have used the CX racing one on the previous build which was actually a lot better. The RB one requires you to weld the inserts in and I have found this manifold is a bit thinner than the CX racing one, which requires careful welding as it will warp more readily.

After a lot of grinding and fitting up, the bank 1 and bank 2 pipes are fitted and welded up very carefully in such a way where they drop right onto the three locating rings on the inserts. The extra work done now to get it perfect pays off later in the build. The pipes are then tacked but not fully welded to the manifold flange, the pipes will need to come out later to cut the hole for the link pipe.

A lot of effort was put into making a bracket to hold the turbo to the engine, this really saves time as the turbo could be positioned accurately, but tilting the mount and stacking washers to really fine tune the position down to the mm. Luckily the compressor housing and turbine housing are a lot smaller than a G35-1050, (although the CHRA itself is quite long on an EFR) and it was quite easy to get the turbo well positioned once the mount was made.

For the link pipe, a coped piece of pipe needs to be made. This is a tricky piece as the link pipe has a larger diameter than the manifold, so a normal coped cut will leave a massive gap on the top and bottom. The simple solution is to hammer and shape the 'lip' of the cope so it sits against the manifold with no gap. I have found this part is tricky to fine tune, this was done in CAD first, then 3D printed so it slides onto the pipe as a guide for a paint pen mark. This is then cut with a plasma torch and cleaned up with a grinder

The next section of link pipe is some tight radius bends, these need to be cut a few times on the bandsaw until the right angle is acheived, nothing too hard but time consuming. A lot of time was spent on the grinder to get the flange to drop in nicely over the 90 degree elbow too.

After this, the cope piece is tacked in and used as a template to cut the hole in the manifold. The pipes are then seperated from the flange and the hole is cut out with a grinder. The bank 1 and bank 2 streams have to be seperated to keep the o2 sensor readings accurate, so a steel disc is welded in between to seperate them.

Next step is to fully weld up the pipes to the manifold flange, weld the link pipe onto the manifold

[Brule]

Nice welding on the V band.

Did you get any dyno resultd from the Pulsar setup you did.

I think the larger frame turbo would make more torque and power from lower rpm even at 2000rpm-3500rpm then the EFR.

Any data you got from that setup especially lower rpm stuff?

I want a Precision 5862 turbo but worried it might make less down low then a 6266 due to back pressure.

[vtl]

Thanks! The flange welded really nicely and was the first time I've done a full circumference looking that well freehand without using a positioner or using pulse welding

No dyno stuff, just a few logs so far which weren't ideal due to not being in an open road and the car still needs to be tuned.

The larger turbo is heaps laggier than the EFR. The 7670 EFR can hit 20psi by 3300rpm, at the same rpm the Pulsar 6862 is doing only 5psi, it needs around 4400rpm to reach 16psi. Basically a night and day difference in response between the two, and this is pretty much what I'd expect for a turbo of this size. Would likely need a higher rev limit to really take advantage of this turbo as it wants to make all the boost up top.

The singles are still much larger than the combined stock twins and you're not going to make less power down low with a smaller single.

[jzx_andy]

I would say the 5862 would definitely make more down low than a 6266 on pump fuel.

On e85 the difference between the two may be less obvious, particularly if you are safe and tune a 5862 setup to come on slower in order to look after the rods. This is something that Adam from JMC advised me when I was tossing up between the 3582r gen2 (essentially a reverse 6266 that's maybe a tad smaller overall) and 3576r gen2 (slightly smaller than a PTE 5862).

Andrew from Zero to 60 uses a Pulsar g35-1050 clone with his JMC kit. On e85 and with a single scroll housing, it seemed to have a similar boost threshold to what Vince described. Pretty gutless below 4k and would be tempting to run a higher rev limit to regain some powerband.

[Brule]

Make a 5862 bottom mount so I can see your data hahaha.

Keep it up welds are nice!!

[Socket]

After 12 months the scale model of spcgry is finished and safe at home in its display case. The model was built by Randel at One of One diecast. Randel did an amazing job. The attention to detail is just crazy. The photos and video really do not do it justice. If anyone is looking for someone to do a custom model of their ride, I can highly recommend Randel. Hit him up on facebook

[kookie]

Are you getting another one commissioned seeing your car has changed again

[Socket]

Originally Posted by kookie

Are you getting another one commissioned seeing your car has changed again

No mate, modding one car is hard enough

[waterbottle1]

oh man socket, you are still going strong here!
beautiful build as always mate

[Socket]

Originally Posted by waterbottle1

oh man socket, you are still going strong here!
beautiful build as always mate

Hey mate, glad to see you after all this time. Hope life is treating you well

[CalvinNismo]

Hi Socket, great car and a great thread! It took me a while to make my way through, but learned a lot.

Yours/vtl's new manifold setup reminds me of one a company in the UK makes. Not an abundance of information on it online but it's made by Leadfoot Racing. Thought seeing it might help you guys out if you've not got everything buttoned down yet.

https://www.leadfootracing.co.uk/pro...turbo-rhd-n54/

[IMG]https://www.hackengineering.co.uk/wp...-1024x1024.jpg[/IMG]

[Socket]

Originally Posted by CalvinNismo

Hi Socket, great car and a great thread! It took me a while to make my way through, but learned a lot.

Yours/vtl's new manifold setup reminds me of one a company in the UK makes. Not an abundance of information on it online but it's made by Leadfoot Racing. Thought seeing it might help you guys out if you've not got everything buttoned down yet.

https://www.leadfootracing.co.uk/pro...turbo-rhd-n54/

[IMG]https://www.hackengineering.co.uk/wp...-1024x1024.jpg[/IMG]

Cheers Calvin.... very interesting.... thanks for the link.... Are you working on a project car? If so what have you done so far??

[CalvinNismo]

Originally Posted by Socket

Cheers Calvin.... very interesting.... thanks for the link.... Are you working on a project car? If so what have you done so far??

Hi Socks, I'm currently working on a single turbo E87 build… It's single turbo though because it's an N55. 😂

The E87 is pretty much a shell now and I'm just working on cleaning and tidying the underside and getting the loom fully out. I haven't started stripping the 135i yet, but I will in the not too distant future, once the E87 is 'ready'.

I look forward to your turbo updates!

[Socket]

Originally Posted by CalvinNismo

Hi Socks, I'm currently working on a single turbo E87 build… It's single turbo though because it's an N55. 😂

The E87 is pretty much a shell now and I'm just working on cleaning and tidying the underside and getting the loom fully out. I haven't started stripping the 135i yet, but I will in the not too distant future, once the E87 is 'ready'.

I look forward to your turbo updates!

Big job mate.... hope it goes well keep us posted !!!

[Socket]

Busted the front lip again
Lucky I ordered more then 1 last time I ordered from maxton design in the UK
Nice day to work on the car

[Coupes33]

I see you are giving the original wheels a run Phil. SPCGRY looks great no matter what wheels you have on it.

[Socket]

Originally Posted by Coupes33

I see you are giving the original wheels a run Phil. SPCGRY looks great no matter what wheels you have on it.

Thanks Coupes, front passenger side is a bit scuffed up, so don't look too closely