GQ Nissan Diesel tourbcharging

Sorry i forgot to mention that fuel comsumption did ont improve any.

I have an 89 gq what brand of extractors have you got and was the exhaust mandrel bent?
Was the performance and economy appreicable???

Fossil you tool

Hi Greg, night shift and computer problems,but I have eventually got around to it. The extractors I have fitted are MOTAVATOR MPH 598, they fitted with on problems,some brands may not fit as easily. The piping is not mandrel bent,as I already had a 2 1/2 in. system fitted ,so I stayed with that. I would recommend the mandrel pipe. The muffler is a MERCURY straight through and I have a resinator at the rear end.(A bit noisier than normal,but nothing to be worried about,I am going to fit another at the end of the extractors.
I have fitted another air cleaner adaptor (sits on top of the inlet manifold)(home made)this increased the inlet dia. from 63mm (std) to 67mm,along with the K&N filter,helps the air flow.
Tests I have done (hot,dry air):- 100km/hr steady
90mm PVC ram air tube (removed LH headlight and fitted tube into air cleaner flex piping.
Inlet manifold vacuum went from -2.8kpa (std. air cleaner setup) to -.1kpa at 1000kph.
Fuel consumption went from 24mpg to 26.5mpg.(so at least 1 1/2 to 2mpg extra).I used the same bowser, same side of bowser etc. and made sure there was no air in the tank.This may not sound much, but on a graph it is fairly drastic,in fact with the standard system the vac. is around -1.8 at 80kph to -4.5 at 130kph, where as with the ram air(snorkle) it is around -.1 at 80kph and stays about the same through to 130kph.
OK, so the extractors do not hang on (power wise) as does the turbo,but it does not cost as much and the engine will last a lot longer. When I tow my van I have to go back to 4th on some long slow hills. I have just been for a test run in a 96st 2.8td, I noticed that the pickup and top speed was approx. the same as my 4.2d with extractors and ram air. Hope you can follow this and it helps with your decision.Gordon.

Hi Greg, night shift and computer problems,but I have eventually got around to it. The extractors I have fitted are MOTAVATOR MPH 598, they fitted with on problems,some brands may not fit as easily. The piping is not mandrel bent,as I already had a 2 1/2 in. system fitted ,so I stayed with that. I would recommend the mandrel pipe. The muffler is a MERCURY straight through and I have a resinator at the rear end.(A bit noisier than normal,but nothing to be worried about,I am going to fit another at the end of the extractors.
I have fitted another air cleaner adaptor (sits on top of the inlet manifold)(home made)this increased the inlet dia. from 63mm (std) to 67mm,along with the K&N filter,helps the air flow.
Tests I have done (hot,dry air):- 100km/hr steady
90mm PVC ram air tube (removed LH headlight and fitted tube into air cleaner flex piping.
Inlet manifold vacuum went from -2.8kpa (std. air cleaner setup) to -.1kpa at 1000kph.
Fuel consumption went from 24mpg to 26.5mpg.(so at least 1 1/2 to 2mpg extra).I used the same bowser, same side of bowser etc. and made sure there was no air in the tank.This may not sound much, but on a graph it is fairly drastic,in fact with the standard system the vac. is around -1.8 at 80kph to -4.5 at 130kph, where as with the ram air(snorkle) it is around -.1 at 80kph and stays about the same through to 130kph.
OK, so the extractors do not hang on (power wise) as does the turbo,but it does not cost as much and the engine will last a lot longer. When I tow my van I have to go back to 4th on some long slow hills. I have just been for a test run in a 96st 2.8td, I noticed that the pickup and top speed was approx. the same as my 4.2d with extractors and ram air. Hope you can follow this and it helps with your decision.Gordon.

Hi Glen, I noticed in your reply to Bill that you run your Patrol at about 150kw(Flywheel?) I fitted the same turbo etc. to my 93 st and it was tuned to approx. 100-110 kw. (7 3/4 psi). (I have extractors now).I was wondering how you could get 150kw (approx. 75% increase from standard) without doing some sort of damage to the engine, over the long term. Puzzled Gordon.