Description

240z/260z/280z Rear Diffuser

This is a high quality Skillard aluminum Rear Diffuser built for the Datsun 240z, 260z, and 280z. It comes ready for easy installation, taking anywhere from 30-90 minutes to install.

Rear Diffuser Specs

This custom skillard rear diffuser comes in raw aluminum or with a black powder coat finish. See below what sets this diffuser apart from its competition.

• Made of high quality 1/8″ aluminum for a long lifetime.
• Designed to fit around the OEM fuel tank, but will likely work will a fuel cell depending on size and location.
• Open for both single or dual exhaust setups.
• Installation is quick and easy.
• Weighs only 14lb.
•  Openings for exhaust are 10″ wide and 5″ tall, not including the cutout for exhaust tip.

Customer Feedback

Below is some feedback from Steve Hoyles who has track tested our S30 Rear Diffuser. His comparison graph can be seen in the pictures above.

“Ben,

I spent some time on the track over the holidays trying to get my car

setup with your diffuser and I thought I would share some data. I run

your diffuser on both my personal race car and we also have one on my

team’s WRL race car. Both cars are 240Z’s (see photos attached). On

my race car I run a front splitter which extends to the engine cross

member.

After mounting the diffuser the car immediately has

much more rear grip but understeers badly. After playing with setup I

found that adding 3 PSI to the rear tires and setting the wing to zero

degrees (6 degrees without diffuser) balanced the car fairly well. A

comparison graph of the data of the best diffuser run vs. my previous

personal best is attached. The diffuser run was about 0.8 seconds

faster (1:45.0 vs 1:45.8) and about 5MPH quicker at the end of the

longest straight. The car is still a little understeer biased so my

mid corner speeds are a little off with the diffuser but I think with

a little more tuning I could get another half a second out of it. I

am a staff instructor at this track and I have thousands of laps on

this car. Dropping 0.8 seconds in one tuning session is very

impressive.

I’m very happy with how effective the diffuser is at adding rear

downforce while keeping the drag of the car low.

Thank you for making such high quality products for these old cars!!

With your stock diffuser and a 3″ splitter the car is VERY balanced and easy to

drive at the limit.

How to install a Skillard 240z/260z/280z Rear Diffuser

Looking to complete the package?

Pair this Datsun S30 Rear Diffuser with a Skillard Front Splitter for maximum aero on you Datsun Z.