Next Step For The Stag - Exhaust

[zoomzoom]

So a brief run down of where I am at on my S1 stagea: I replaced my worn turbo with a hypergear high flow unit last year, which added lag naturally, but more than I expected. I then added an MV shift kit, as a precautionary mod. Plus the trans works so much faster.

However now I am looking towards some kind of tuneable ECU, which will probably have to be standalone since its an S1 auto. Before I look at that, I feel I should upgrade the stock exhaust.

I would like something quiet though. In fact I wouldn't rule out anything as too quiet, I am just interested in maximising the performance of the turbo.

What would be the best solution? Even second hand?

Plus is it worth getting these ebay dump pipes? Such as this?

http://www.ebay.com.au/itm/TOG-NISSAN-R32-R33-SKYLINE-RB20-RB25DET-GTST-R34-GTT-TURBO-EXHAUST-DUMP-PIPE-/181239134171?pt=AU_Car_Parts_Accessories&hash=item2a32b1b7db

Even though stainless steel is nice, mild steel would work for me. Im not concerned about looks either.

[Trex]

You'd need a piggyback not a standalone. What turbo did you get?

I personally wouldn't bother with those mini dumps. Get a full split or belmouth dump/front pipe that will connect the turbo to cat with 1 pipe. high flow cat are cheap these days. and you may have to make your exhaust if you want it to be quiet.

a cheaper option may be a 32gtr exhaust which had to have the tip extended 10-20mm to exit the bumper, also the gtr rear muffler hanger. i couldn't see any other mods needed to make it fit, don't quote me on this. It is a full 3" from the turbo and has 2 oval shaped straight through mufflers, It's quiet on idle and cruising up to 4k but it does scream at high rpm and will drown everything else out.

Yours being a highflow will naturally be deeper so maybe a larger rear muffler will do the trick. There is enough room under there to fit a massive muffler!

Edited June 30, 2014 by Stagea97

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I purchased the standard profile R33 high flow from hypergear. Also I am out of my depth with the ECU side of things, apparently.

[XRATED]

Single piece full length mild steel bell mouth dump/down pipe combo.

I would get a custom 3" made at an exhaust shop... with a nice big center muffler and big oval rear muffler. The exhaust shop can get it to fit up nice and close to the body to maximize ground clearance.

What are your power goals? If they are modest you might be able to get away with an safc neo (has some timing control as well as fuel).

Don't forget to change the fuel pump too.

Edited June 30, 2014 by XRATED

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Modest power goals. I can't imagine I would go past 12-14 psi

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Im mainly trying to recover the lower rpm response and power.

[hypergear]

Did that have a OP6 mark on the rear housing?

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Did that have a OP6 mark on the rear housing?

I don't believe so, however that is going to be a guess as the turbo is behind heat shields now. At the time I only ordered the regular R33 turbo/exhaust housing.

Edited June 30, 2014 by zoomzoom

[hypergear]

I have slotted the actuator bracket, preload the actuator and see if that helps.

Factory 21U turbine ended high flow has similar response to stock turbo with a manual, but I'm not sure what its like on Autos. If it is an OP6 then it can make a lot of power, but will be down on response.

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I had the chance to take off the heat shield and its definitely a 21U housing. However, I cannot see how I can alter the wastegate at the flap side or the actuator side to add more preload. The position seems to be fixed.

From memory, you also enlarged the wastegate hole, and the flap is larger?

If that is so, could the additional surface area simply be overpowering the tension on the wastegate actuator?

Photo is attached:

[scotty nm35]

If that is so, could the additional surface area simply be overpowering the tension on the wastegate actuator?

That is exactly what is happening.

[zoomzoom]

It would certainly seem like it. Even with a ball and spring valve MBC, the onset of boost is very gradual and reminds me of just plumbing the intercooler pipe straight into the wastegate. My wastegate is the 0.3 bar standard one.

I have had my eyes on these for a while:

http://www.ebay.com.au/itm/Kinugawa-Adjustable-Turbo-Wastegate-Actuator-Nissan-Skyline-RB25DET-R33-/291179923073?pt=AU_Car_Parts_Accessories&hash=item43cbad0681

Though judging by the shape of the bracket on it, I dont think it will attach without creating a new bracket. ie the Kinugawa looks like it sits flat on the front of the turbo, whereas in my picture above the stock has a right angle bracket...

[hypergear]

The wastegate has been bored out to suit the disc. I have slotted where the bracket is bolted onto the compressor housing, so if you lose up that two bolts you will find it can move up and down. It looks like its been preloaded already so no need to touch that.

In this case you might just need to get the car tuned with timing and fuel adjusted. I can supply an adaptronic ecu at a cheap price since you've purchased the high flow service from us. Please PM for additional information.

[Ben C34]

How does the adaptronic go woth the auto trans?

[Trex]

How does the adaptronic go woth the auto trans?

I tried to find out the same info a while ago from adaptronic and a local tuner but was never given an answer

It still needs to be to be used as a piggy. I know of an auto r33 that has used one as a piggy and made roughly 280kw, I was never able to contact the owner to ask him exactly how well it went and if all the features were available.

I do know a manual r34 that used one as a wire in standalone before adaptronic made them, it had some idle issues and would always hunt. Made great responsive power though!

Edited July 2, 2014 by Stagea97

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The wastegate has been bored out to suit the disc. I have slotted where the bracket is bolted onto the compressor housing, so if you lose up that two bolts you will find it can move up and down. It looks like its been preloaded already so no need to touch that.

In this case you might just need to get the car tuned with timing and fuel adjusted. I can supply an adaptronic ecu at a cheap price since you've purchased the high flow service from us. Please PM for additional information.

I will certainly keep it in mind. It has been a long term plan. However, I will take small steps at a time.

Now that I have seen a photo of the kinugawa wastegate actuator installed, I believe it is worth a shot first. Between the 0.8 bar it comes with, and an additional 0.5 bar spring, I will see if those make a difference. If the high-flow wastegate flap has more exhaust pressure forcing it open compared to a stock turbo, hopefully the 0.8 bar spring will make a tad less boost than that.

[hypergear]

How does the adaptronic go woth the auto trans?

I'm not sure if adaptronic has the CAN data for Stagea auto. Which is why I had to keep the factory ECU in the Kia for Auto commands. If that is the case then it will have to be an piggy back for this car, good part is it is cheaper in price.

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Just been doing some further research on everything. I will update when I have installed a stiffer wastegate spring.

Firstly, Stao, I have been reading the adaptronic site. Which ECU were you thinking would work with the auto stagea?

Secondly, in terms of dump and front pipes, the opinion I am getting from SAU is that bellmouth dump pipes with a bend in the section just before the cat converter is the most likely to fit, as the ones with straight pipes touch the body, and split dumps interfere with nearby piping.

Something like this should fit? http://justjap.com/index.php/jjr-mild-steel-3-bellmouth-front-dump-pipe-nissan-skyline-r32-r33.html

I would prefer it in stainless, however it looks like it is a straight pipe to the cat: http://justjap.com/index.php/jjr-stainless-3-bellmouth-front-dump-pipe-nissan.html

I will have to check with just jap whether it is a straight item.

[hypergear]

The Just jap will will do ok, Just need to die-grind the flange area to suit the factory dump gasket. I will make an inquiry for you about the plug in ecu with factory auto.

[hypergear]

Got a reply. The R33 plug in ecu only works with Manual. You will need to run a piggy pack and keep factory ecu for Auto commands. I can supply the E420d at a reasonably good price for existing customers. Please do drop in an pm if you would like to run that Piggy pack ecu.