Diesel engine performance & tuning

 

HOME
TESTIMONIALS
ACCESSORIES
DIAGNOSIS & MAINTENANCE
PERFORMANCE UPGRADES
 
General advice
Model index
 
Petrol engine tuning
LPG conversions
 
Diesel engine tuning
OTHER UPGRADES
NEW PARTS
RECYCLED PARTS
FAQ
ARTICLES & LINKS
CONTACT US
BLOG

 

 

Information management & website development
ASPAC Consulting


Before 1994, Land Rovers wwere available with either the 2.5-litre 200  Tdi engine or the 3.5-litre  Rover V8. The 2286cc 4cyl, ohv, indirect injection, diesel was first used in S2A, S3 and early 90 and 110s. A five bearing crank-shaft was introduced in 1980. The original transmission was a dual-ratio five-speed manual with drive via a  transfer case with a lockable centre differential. Attempting to upgrade this engine is NOT recommended..

The 200TDI (1990 - 1994) 2495cc, 4cyl, ohv, direct injection, diesel (nominally 2.5L). natural aspiration developed 85bhp at 4000rpm, 150 lb-ft at 1800rpm. The turbo version developed 107bhp at 3800rpm, 188 lb-ft at 1800rpm. This engine is still in common use as a hardy, reliable power plant

In 1994, the 200Tdi engine was replaced by the 2.5 L 300Tdi 4 cylinder engine with Bosch electronic emissions control for certain models. At around this time, a stronger R380 gearbox was fitted to all manual models.

The Series II Discovery debuted in autumn 1998.  The 2,495 cc Td5 in-line direct-injected electronic management was smoother, producing more usable torque at lower revs than its 300Tdi predecessor. The Td5 engine was derived from the  Rover L-series passenger car engine.

Marketed as the LR3 in the USA, Land Rover introduced the Discovery 3 in 2004. The engines were all  Jaguar / Ford/ PSA-developed 2.7-litre, 195 hp (145 kW), 440 Nm  V6. These vehicles were fitted with multiple electronic traction control systems including the 'Terrain Response' systems where the on-board computer selected the gearbox settings, suspension height, differential lock and throttle response of the engine.

In 2009, the Discovery 4 was released with two engine options from  Jaguar Land Rover's Gen III. The  TDV6 Gen III was a 3.0-litre development of the 2.7-litre engine used in the D3 with twin-sequential  turbochargers.  Fuel economy, power, torque and exhaust emissions were improved. In 2011, the 2.7-litre engine was dropped and two versions of the 3.0-litre engine were made available – the TDV6 and the SDV6 (the latter offering 245 bhp).

Tuning the Land Rover Diesel engines

Just as with any other engine, adjustments / enhancements can maximise the power output, but no amount of tuning will improve an engine that is not running correctly in the first place. Also, an engine typically delivers less than half of its power to the wheels with every related system (air con etc) robbing power from the wheels.

Unlike petrol engines, diesels are designed to provide maximum torque at the low end of the RPM range. It delivers its greatest power to climb hills, tow trailers etc at low and medium RPM.

The starting point is to ensure that the engine is performing as designed, meaning that fuel and air settings are correct, air intake is as efficient as possible, the exhaust system is clear of blockages and the injectors are delivering fuel at the correct pressure and spray pattern. Only when these factors have been checked and adjusted is there any merit in making further enhancements.

Assuming the engine now has a “clean bill of health” fuel mapping is the best way of increasing power and torque. However, the only effective way to measure what is happening is by using of a dynamometer. This actually measures performance at the wheels – where it matters.

The 2286cc 4cyl, ohv, indirect injection, diesel was first used in S2A, S3 and early 90 and 110s. A five bearing crank-shaft was introduced in 1980. We do not generally recommend attemping to upgrade this engine

The 200TDI (1990 - 1994) 2495cc, 4cyl, ohv, direct injection, diesel (nominally 2.5L). natural aspiration developed 85bhp at 4000rpm, 150 lb-ft at 1800rpm. The turbo version developed 107bhp at 3800rpm, 188 lb-ft at 1800rpm. This engine is still in common use as a hardy, reliable powerplant

300 TDi, turbo, diesel, inter-cooled (1994 - ). 2495cc, 4cyl, ohv, diesel (nominally 2.5L). 90.5mm x 97mm, 19.5:1 cr, 111bhp, 83kW at 4000rpm, 195 lb-ft, 265Nm at 1800rpm. This is a quieter, faster engine than the 200TDI. Many are poorly tuned and performance may be significantly improved using our tuning techniques.

The performance data graphed by our dynamometer for all of the various diesel engines may be selected from the following table

Vehicle
Example
200 and 300TDI

Graeme Cooper Automotive 2019
All rights reserved