1HD-T Turbos
Submitted: Sunday, Aug 22, 2004 at 18:20
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Sam B
Hi, Has any gone through the project of putting bigger compressor
wheels in the CT26 turbos (1HD-T) , do they have any Dyno readings and what worked etc Thanks
I have just put a 1HZ in my BJ74, (the 13bt got the Boot!!) with a 1HD-T turbo assembly and fuel pump fitted to it, I need more responce down low i.e. 1600rpm
thanks SAM B
Reply By: Rowdy - Sunday, Aug 22, 2004 at 19:59
Sunday, Aug 22, 2004 at 19:59
Yo Sam,
Mate, I dont know much about this "bigger compressor
wheels thing" for the 1HD-T, but I do know that
mine is very sluggish below that 1500/1600 RPM mark also.
I have an Auto (Sahara) and below those revs, she is very doughy, but when that turbo kicks in, at about 1600/1700 - hang on....
I was considering an alteration to the torque converter, to change the lockup (stall speed) from 1300rpm to about 1700rpm, that way the turbo boost would come in at the same time as I got direct drive to the transmission - however , a lack of confidence that I'm on the right track has held me back, so far!!!
Tell me more about these compressor
wheels - what role do they play, etc..
Rowdy...
AnswerID:
73599
Reply By: Bob H - Sunday, Aug 22, 2004 at 20:23
Sunday, Aug 22, 2004 at 20:23
Hi Sam,
From what i have assimalated from turboing cars, a smaller turbo will spool up quicker(come on boost) than a bigger one. you have to work out what you need, more power down low or more up higher in the rev range as a smaller turbo will not give the results up high and a larger turbo has the power up high and notdown low. May two turbos(1 small and 1 large) or alternatively a supercharger would over the problem of no go at low revs. hope this helps.
Regards
Bob
AnswerID:
73603
Reply By: ianmc - Sunday, Aug 22, 2004 at 22:45
Sunday, Aug 22, 2004 at 22:45
A free flow exhaust, say 2.5" with low pressure muffler will help low speed grunt
a bit. Also make sure your air intake/filter is free flowing, no undue bends & clean filter.
AnswerID:
73633
Reply By: Truckster (Vic) - Monday, Aug 23, 2004 at 08:47
Monday, Aug 23, 2004 at 08:47
You should have a word to the blokes at JPC in
Melbourne, they do heaps of high-flowing work on turbos.
They had a hand in some GQ's runnin round with over 180kw at
wheels. but at the cost of reliability, but that will go the same with any donk..
Power costs $ and reliability on any engine.
AnswerID:
73649
Reply By: Paul from Denco Diesel and Turbo - Wednesday, Aug 25, 2004 at 13:35
Wednesday, Aug 25, 2004 at 13:35
Compressor
wheels compress air to pull through the turbo.
A larger compressor wheel takes MORE power to drive it, and so speeds up slower than your original compressor wheel. With a larger wheel you would have more power in the top end, rather than in the love revs where you need it.
Hi-flowing puts a larger compressor wheel into the turbo, so this is not the solution for you.
Denco have a turbo upgrade for the CT26 which gives better mid and high range power than the factory turbo.
To get more response down low you should approach your closest DENSO diesel fuel injection specialist.
AnswerID:
73900