NLF Welding Specialist

NLF Welding Specialist Exhausts, intercooler cooler piping, turbo manifolds and more

What happens when you reduce engine reversion?Recap.My previous setup had my consolidated turbo manifold with a t3 singl...
24/11/2025

What happens when you reduce engine reversion?
Recap.
My previous setup had my consolidated turbo manifold with a t3 single scroll 1.06 gen 3 3584 with the wastegate plumbed off the turbine housing.

The new setup has my newly designed consolidated split pulse turbo manifold. The wastegate is plumbed off the turbo manifold collector with a divider tongue going all the way to the wastegate valve. This keeps the exhaust gases separate for as long as possible, helping reduce engine reversion, resulting in a cleaner air fuel mixture.
Turbine housing is a t4 1.06 twin scroll.

The outcome, 14.3kw overall power increase, makes the same power in the lower rpm with 2.4psi less boost, makes the same power mid rpm with less boost, more overall power in the higher rpm with same boost.

The tune was not touched when comparing the new setup.
Fuel: e10

Why have the divided tongue all the way to the wastegate valve and not end it flush with v-band like artec turbo manifolds? Have a read of Morrison Fabrications findings and see what happens when you have even a small gap that allows exhaust gases to cross over.

https://www.facebook.com/share/p/1DFkM66rwa/

04/11/2025

Well that was a succes!
No boost spike!
So the car picked up an extra 2 psi on the same tune when changing the setup to a split pulse consolidated manifold with the wastegate mount on the manifold, divided all the way to the wastegate valve. Why? Simple, a decrease in reversion which means more efficiency. Will be taking the car to the roller dyno in 2 weeks and run it on the same tune to see where exactly it picks up. Will also do a run on the Dyno with the same boost as before (the previous setup up saw 8psi on the Dyno so when it visits the Dyno next, I will set the boost at 8psi) and if in fact reversion has been reduced and the setup is more efficient, then theoretically it should make more power with the same boost, on the same tune.
I will be at a bit of a disadvantage as the data from the last Dyno run was done in May so hopefully it won't be too hot on a day when I'm back there.
My theory is that because it has a cleaner air fuel mixture from reducing reversion, that it's able to make more boost. if wastegate priority was the reason to why it's increased the boost, there would be other signs such as boost spiking. I will know for sure when I take it back to the Dyno..

04/11/2025

Which sounds better? Titanium muffler or straight pipe?

Here's a comparison on the barra with the G42 twin scroll 1.15 turbine housing with twin gates on the split pulse turbo ...
24/10/2025

Here's a comparison on the barra with the G42 twin scroll 1.15 turbine housing with twin gates on the split pulse turbo manifold against the 3584 gen 3 1.06 turbine housing on a consolidated single scroll turbo manifold. There was less than 1000 rpm difference between the two...
Utilizing 2 gates, one on each merge completely eliminates reversion/cross talk allowing for a cleaner air/fuel mixture. Benefits are a faster spool. Combining it with a consolidated turbo manifold means:
-volumetric efficiency increase
-generate more mass airflow in the turbo sooner
-create more power in low rpms with less psi

The purpose of this comparison is to demonstrate a split pulse setup on a turbo many frame sizes up wasn't that far behind in boost response with its divided setup vs a 3584 on single scroll manifold.

24/10/2025

G42 twin scroll - twin gate turbo manifold

Prototype split pulse 50mm wastegate merge for the barra 3584 consolidated turbo manifolds.Has the divider all the way t...
24/10/2025

Prototype split pulse 50mm wastegate merge for the barra 3584 consolidated turbo manifolds.
Has the divider all the way to the wastegate valve to further reduce reversion. Benefits are faster spool time, better fuel economy and a cleaner air/fuel mixture from reducing reversion. With the t4 fl**ge and some other tweaks, I'll hopefully be able to reduce the emap ratio and have the max power in the desired rpm.
This split pulse wastegate design will be available for all my consolidated turbo manifold designs including rb30, tb48 and barra.
Also soon to be released will be my VE ls2 turbo manifolds..

If you would like to know more about the topic of wastegate split pulse setups regarding the splitter going all the way to the valve, check out this like from Morrison Fabrications

https://www.facebook.com/share/p/1CZi52Pqub/

I worked on my titanium polishing method and re anodized the piping in a more exotic purple. Pretty happy with how it ca...
20/10/2025

I worked on my titanium polishing method and re anodized the piping in a more exotic purple. Pretty happy with how it came up. For all your tig welding needs, please message me.

Address

Sparks Road Gorokan
Gorokan, NSW
2263

Opening Hours

Monday 7am - 5pm
Tuesday 7am - 5pm
Wednesday 7am - 5pm
Thursday 7am - 5pm
Friday 7am - 5pm
Saturday 9am - 5pm

Website

Alerts

Be the first to know and let us send you an email when NLF Welding Specialist posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Contact The Business

Send a message to NLF Welding Specialist:

Shortcuts

Share

Category