Hey all,
This week I fabricated myself a 3" dump pipe to replace the OEM cast one, thanks go to MickL for supplying his old one to use as a pattern - so my car wasn't off the road all week . I basically wanted to remove the major restriction the 1KZ-TE motor has in the exhaust system without going to the expense of a whole new system (call me a tight-arse). The bore diameter of the cast one is roughly 1 3/4" and the rest of the system is just under 2 1/2". I was prepared to replace the muffler if needed, but first impressions are that I'm more than happy with the results. This thing now pulls right up to the redline now whereas before you had to upshift just above 3000rpm as there was nothing above that point. It would be very interesting to compare my result with a mandrel bent 3" system fitted - chipped prado on a dyno.
I made a jig using the cast dump pipe, fabricated a flange from 10mm plate to suit the intermediate pipe including studs and used the turbo housing flange Mick sold me, (I was going to profile cut my own but for $20 why bother?). Used one 135 deg bend and a 90 deg bend (in 3" pipe). The result didn't look too dissimilar to the Beaudesert and Taipan ones available except for being shorter and made in mild steel not stainless. A coat of heat proof paint to combat corrosion and it was a straight bolt in jobby. All up cost me $75 plus my time.
I did add some brackets to it to refit the heat shield but due to the differing dimensions of the pipes the shield touches the new pipe in one spot and rattles a little, so I think it will be removed in the next few days.
I will take some photo's tomorrow and post here, though with the benefit of hindsight I should have done that during fabrication and before fitment but I do realise this mod isn't really a handyman's project - there is a bit of skill with a mig welder required and machining of the flange isn't something you can do without a lathe and if you have those skills you shouldn't really need a series of photo's to show you what to do.. 8)
[edit photo's attached]
Regards
Adrian
This week I fabricated myself a 3" dump pipe to replace the OEM cast one, thanks go to MickL for supplying his old one to use as a pattern - so my car wasn't off the road all week . I basically wanted to remove the major restriction the 1KZ-TE motor has in the exhaust system without going to the expense of a whole new system (call me a tight-arse). The bore diameter of the cast one is roughly 1 3/4" and the rest of the system is just under 2 1/2". I was prepared to replace the muffler if needed, but first impressions are that I'm more than happy with the results. This thing now pulls right up to the redline now whereas before you had to upshift just above 3000rpm as there was nothing above that point. It would be very interesting to compare my result with a mandrel bent 3" system fitted - chipped prado on a dyno.
I made a jig using the cast dump pipe, fabricated a flange from 10mm plate to suit the intermediate pipe including studs and used the turbo housing flange Mick sold me, (I was going to profile cut my own but for $20 why bother?). Used one 135 deg bend and a 90 deg bend (in 3" pipe). The result didn't look too dissimilar to the Beaudesert and Taipan ones available except for being shorter and made in mild steel not stainless. A coat of heat proof paint to combat corrosion and it was a straight bolt in jobby. All up cost me $75 plus my time.
I did add some brackets to it to refit the heat shield but due to the differing dimensions of the pipes the shield touches the new pipe in one spot and rattles a little, so I think it will be removed in the next few days.
I will take some photo's tomorrow and post here, though with the benefit of hindsight I should have done that during fabrication and before fitment but I do realise this mod isn't really a handyman's project - there is a bit of skill with a mig welder required and machining of the flange isn't something you can do without a lathe and if you have those skills you shouldn't really need a series of photo's to show you what to do.. 8)
[edit photo's attached]
Regards
Adrian
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