Intercooling versus other?

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Originally Posted by justinc

In that vid, mine isn't much slower to build up boost but your lower gearing is a plus in that dept.

I agree in theory about the top end, BUT I can still get to the fuel governor in 4th gear, approx 145Km/h. It gets there quite quickly too:eek:, so I am quite happy with its all round performance really.

And I sympathise with 'workshop ornament' staus:(. I have the same problem with aux water tanks, twin shock set up, twin spare carrier parts, etc etc. ...One day....:(:D

JC

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When I had the 1.2 LT230 mine would hit the governer at about 145. Now with the 1:1 there's nowhere I'm willing to try it.
I run an exhaust manifold pressure gauge everytime I change something. This little T25 I run can deliver more boost than backpressure below 2000rpm, but over that the combination of small exhaust and small turbo means backpressure climbs fast.
A bigger turbo will shift that crossover point higher up the rev range.

I actually have a mostly built T25/T28 combo sitting on my workshop bench. Basically a T25 with a 0.64 A/R exhaust housing (currently 0.49) and a 60mm T28 compressor wheel (currently 51.3mm). I just need to bore out a spare T25 compressor housing to fit the 60mm wheel and it will be a direct bolt in swap for my current turbo.

Alas, too many things to do and not enough time or money to get them all done. After passing 11 in a row 6 monthly safety checks (WOF) at private garages, I'm taking the rangie to an official testing station on wednesday. Wish me luck.:(

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Originally Posted by Dougal

When I had the 1.2 LT230 mine would hit the governer at about 145. Now with the 1:1 there's nowhere I'm willing to try it.
I run an exhaust manifold pressure gauge everytime I change something. This little T25 I run can deliver more boost than backpressure below 2000rpm, but over that the combination of small exhaust and small turbo means backpressure climbs fast.
A bigger turbo will shift that crossover point higher up the rev range.

I actually have a mostly built T25/T28 combo sitting on my workshop bench. Basically a T25 with a 0.64 A/R exhaust housing (currently 0.49) and a 60mm T28 compressor wheel (currently 51.3mm). I just need to bore out a spare T25 compressor housing to fit the 60mm wheel and it will be a direct bolt in swap for my current turbo.

Alas, too many things to do and not enough time or money to get them all done. After passing 11 in a row 6 monthly safety checks (WOF) at private garages, I'm taking the rangie to an official testing station on wednesday. Wish me luck.:(

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I agree with gearing, with 1:1 high range and your 5th gear you could easily go TOO fast:eek:
Good luck at the inspection:) I didn't know you guys had 6monthly safety inspections! It'd put a few vehicles off the road down here I reckon. Good thing too. I constantly shudder at the vehicles I see on Tasmanian roads:mad::mad:

JC

Has anyone done any work with Water injection on diesels? Have a little experience in water/ meth injection on petrol. What diffence does the added SCR make.
What nobody has mentioned re I/C is the resultant heat-soak through-out the whole system and effects on longevity.
Dave.

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Originally Posted by Barefoot Dave

Has anyone done any work with Water injection on diesels? Have a little experience in water/ meth injection on petrol. What diffence does the added SCR make.
What nobody has mentioned re I/C is the resultant heat-soak through-out the whole system and effects on longevity.
Dave.

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What are you worried about regarding heat-soak? I wouldn't consider it a longevity concern, more a short term performance reduction.

Since I need water injection for my supercharged rangie as not cost effective to intercool I may as well try it in the 4BD1T. Simply a 150psi 12v pump, water shut off solenoid, 30mic jets,variable pressure controller + relays tank etc.
I actually want to run a more complex set up on a new CRD I have here too.

Water injection was very popular a few years back but now larger intercoolers and water spray over intercooler is more common.

We'll see how it goes with a variable boost controller, more fuel etc. Should be able to run 26psi with no intercooler if set up correctly. May use some metho as well:D

The problem is your 4BD1T will be on boost almost 100% of the time it's driven, so the amount of water you need to carry will be truely astounding.

Will you have an over-ride to reduce fuelling (and EGT's) for those times when your water runs out? Methanol can pre-ignite in a diesel.