Intercooler and fuel efficiency

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Originally Posted by steveG

Just be warned, that once its up and running you'll likely never intercool it ;)
I've even got a WTA sitting on the shelf, but its just so reliable and trouble free I can't bring myself to start pulling it apart and messing around with it.

I've been meaning to throw a thermocouple in the inlet to see how hot the air is from the turbo, but haven't got around to it.
If yours has a working wastegate it will be interesting to compare EGT's etc as mine has the w/g wired shut - I didn't have a suitable actuator at the time I fitted it, and its never made it far enough up the priority list since!

Next build will be a better turbo and an intercooler, but thats a wee way off yet. The T25G still does a pretty reasonable job.

PS: I need to do some work to improve inlet restriction as my setup easily trips the filter indicator even with a brand new filter. Try and keep everything as big and smooth as possible on the inlet side of the compressor (air filter, snorkel, ducting etc) and stay away from corrugated hose to connect your snorkel up with.

Steve

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I was going to follow your lead with the wastegate but now you've got me thinking.
Mine seems to work but have to fab a bracket.

Without a functioning wastegate it's not EGT that is a problem. Rather exhaust pressures build much higher and these kill power. Just like an exhaust brake.

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Originally Posted by Boof Ed

Rar110, what do you mean; curve of the 'barrel'?

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The inlet pipe previously just butted into the side of the filter housing with a circle cut out of the housing. To make the opening bigger I made the inlet so it goes over the curve with an oval shaped opening on the housing.

Attachment 75361

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Originally Posted by rar110

The inlet pipe previously just butted into the side of the filter housing with a circle cut out of the housing. To make the opening bigger I made the inlet so it goes over the curve with an oval shaped opening on the housing.

Attachment 75361

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Looks good.
With the air entering at an angle like that it would help with the cyclonic action to separate dust too. I guess you'd probably want it to swirl the air in the same direction as the vanes on the main filter.

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Originally Posted by Dougal

Without a functioning wastegate it's not EGT that is a problem. Rather exhaust pressures build much higher and these kill power. Just like an exhaust brake.

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I really should get off my butt and put an actuator on mine to see what difference it makes.

Steve

From my experience after fitting a wta intercooler it was a noticable increase in performance ,lower egt . It basicly was a gear differance . What i mean is that if you normally go up a hill in a particular gear on the highway ,you would find you could stay in a higher gear and not have to change down. Therefor the inter cooler is lowering the temp of the air entering the engine thus producing more power . I did the same to a Nissan patrol 4.2 turbo . We dynoed the vehicle on the Friday and re did it on the same dyno on the Monday -6hp increase at the rear wheels.Hope this helped

Graeme:D