Tuned In

Field Report: Why A 4G63 Is BETTER Than An RB26 | R32 GTR 4 Banger.

December 14, 2022 High Performance Academy
Tuned In
Field Report: Why A 4G63 Is BETTER Than An RB26 | R32 GTR 4 Banger.
Show Notes

Pulling out an RB26 and replacing it with a 4G63 is not something you see to often, or possibly ever, when it comes to the R32 GTR Skyline chassis, but that is exactly what has been done to this time attack weapon. Let's see what makes it tick.

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Dom from Tony Rigoli Performance (TRP) runs us through some of the reasons why Chris Alexanders CJA Motorsport Nissan R32 GTR Skyline is better off with a 4 cylinder Mitsubishi 4g63 producing 1030hp to the hubs via a Borg Warner EFR 9280 is better than the equivalent 6 cylinder RB26.

The 4g63 retains the MIVEC setup in this application which along with a custom cam helps the car have great boost response from as low as 4,500rpm with engine management and traction control strategies being managed by an EMtron KV16 and a MoTeC Dash/Logger handing the rest including extra data logging along with a MoTeC PDM.

Like many cars we see now the factory strut towers are retained as per World Time Attack Challenge (WTAC) rules along with the firewall which is one reason why the team have chosen to go with a 4 cylinder engine which gives them great packaging advantages especially when coupled with a transaxle in the rear of the car.

'Fire ring' cylinder sealing is used to keep cylinder pressures where they should be, and how that works along with a copper gasket is explained by Dom along with why a 2.2L 4g63 build using a TRP stroker kit was chosen over a 2.4L option.

Not bad for a build that took a few weeks eh! We're sure there is plenty to dial in and look forward to seeing this build progress up the time sheets in the coming time attack events after a few battles with the aero at this event.

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