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Old 03-21-2019, 09:24 PM   #1
impolvo
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Default How much boost can a d24t +ic take

That is all
Car 262c
D24t from 85? 760
Added intercooler and mbc
Was getting 14 lbs pre intercooler
Intercooled 12-13 swapped to na intake for better flow longer even runners and less heat soak from exhaust manifold

I upped it a bit if I really pull it’ll get 22 lbs
But normal driving not over 18
Seems nice and happy ? But I’d prefer to not assplode it
Runs well , fuel is turned up a bit 3inch exhaust
Stock Garrett t3 oil cooled turbo doesn’t complain
New timing and ip belts
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Old 03-21-2019, 09:31 PM   #2
vwbusman66
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I'd encourage you to get an EGT gauge. That will determine how much more boost/fuel it can take.
Id use the 1.6IDI TD safe EGT range as a benchmark for the 2.4, considering they're similar pumps and the same pistons.

EDIT: Maybe measuring IAT's would be beneficial as well. Good to see when the turbo starts to get out of its efficiency range (or just find the compressor map) or the intercooler runs out of steam.
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Old 03-21-2019, 10:10 PM   #3
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I second the EGT gauge, that’s what really matters.
How much smoke/soot are you getting? If it’s a lot, you’ll want to dial the fuel back.

If the d24 is similar to the VW 1.6, then you can boost away!
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Old 03-21-2019, 10:18 PM   #4
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It can likely take as much boost as you can throw at it. Boost pressure of a few atmospheres is nothing compared to cylinder pressure. And with a diesel, adding boost without adding fuel will just lean out the mixture and make it run cooler, with less smoke. As the others said it's exhaust temp that you should watch closely because that will reach a functional maximum as you start to add more fuel to go along with the boostz.
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Old 03-21-2019, 10:23 PM   #5
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They make widebands for diesel applications, probably the best way? Idk, but you get specific #s at least
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Old 03-21-2019, 10:55 PM   #6
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It can likely take as much boost as you can throw at it.
100%
Buddy/shop mate had a 1.6 VW idi in his samurai. It was running 20-25psi with a Garrett T3 from a om617. Absolute terrifying riot. EGTs would climb if you had your foot planted and pulling a big grade, but usually wouldn’t exceed 1250F ish.
Keep the smoke under control and you’ll be good.
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Old 03-22-2019, 06:18 AM   #7
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Remove waste gate hose and let er rip.
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Old 03-23-2019, 09:39 PM   #8
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I seem to remember that with stock head bolts it was determined that 20 psi was the absolute max "safe" limit. Then again, there's obviously many factors that come into play and I'm sure some engines would handle 25-30 whereas other may pop a head gasket around 15. Does it still have the original head gasket/bolts? My D24T seems to still have the original 2 notch gasket and while I've been tempted to turn the boost up a bit I have to say the 35 year old bolts and gasket worry me a bit! Good to see another D24 guy on the forum still, there is absolutely no other engine of that size that sounds so giant and truck-like haha, I love them.
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Old 03-23-2019, 11:08 PM   #9
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I do plan on adding an egt sensor soon
For now I upgraded to a better boost gauge and keep it sub 18

Last edited by impolvo; 03-24-2019 at 10:43 PM..
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