DIESEL DO NICELY
@ I’ve just bought a Astra Mk5 CDTi 150bhp with the X-Pack, black leather interior, two lady owners, it’s really fast and can keep up with new VXRs. How do you get it up to 240bhp like 888 diesels? Michael
AGood choice of car and they have loads of potential, plus are still capable of returning excellent MPG figures and reliability if looked after. It could be argued that the decision to borrow these lumps off the Italians was one of Vauxhalls best decisions. They do go well, however a new VXR would make it look very silly indeed so we’ll opt for the default “he wasn’t trying” response as the new VXR is a very quick car. To put it in to perspective, the CDTi will hit 60 in 8.4secs, the new VXR will do it in 5.9secs. The CDTi will do 130mph flat out, the VXR is 155mph on paper and reputed to be good for 160 and more… it’s one of the quickest in its class.
Taking a CDTi to 240bhp like the 888 diesels is also a bit far-fetched. For a start the 888 CDTi was 200bhp, not 240bhp and getting a diesel to 240bhp, whilst possible, is neither cheap nor easy. A remap, intercooler, exhaust, hybrid turbo and even at that you may just crack 200bhp. There was always talk of redesigned manifolds and such like but ultimately, the M32 boxes aren’t too keen on the huge torque figures such modifications bring. Many have tried and some have remove the O2 sensor so that it runs rich and it will bang. I have tried this and still no popping or banging. I don’t really want spend loads on it as it’s had too much money on it already. Thanks in advance. PS the O2 sensor is now back in. Steven. succeeded but getting 240bhp from the CDTi unit is not an easy task. A reliable 180bhp to 200bhp along with chassis and brake upgrades would be the better package. That said, a new VXR would still tear it a new one… and that’s before anybody mentions tuning packages.
ANot quite sure where to start with this one to be honest… yes, some cars will naturally pop and bang, and with highly tuned, aggressively mapped cars it comes with the territory. There are a few reasons why a car will do it but it’s more commonly attributed to unburnt fuel, valve overlap, mapping and an unsilenced exhaust system. Some big power engines will pop and bang as they will be fuelling heavily at the top end to match but thus can’t back the fuelling off enough on closed throttle, so tend to ‘bang’ as the excess fuel exits the chambers through the hot manifold. It sounds incredible on your Wortec equipped Monaro VXR or highly strung XE on throttle bodies.
However, on a 1.6 Astra… less incredible and the fact some generic maps are offered that actually overfuel the car on purpose, purely to try and impress Chantelle outside Maccy D’s, is a bit worrying. Disconnecting X, Y or Z is a terrible idea… not only will the fuel economy suffer, but unburnt fuel burns catalysts, gums up the fuel system and also reduces power. It’s right up there with fake brake discs as far as good ideas are concerned so we don’t condone such antics and would instead suggest money is spent elsewhere. Normally aspirated, small capacity engines that were designed for reliability and economy need not pop and bang.
Want ‘pops and bangs ‘ from a small capacity N/A engine... look elsewhere