EGT on Isuzu

[DRanged]

Gday all

Is anyone other than myself running an EGT guage on a 4BD1T Isuzu. ( factory turbo or a/market). If so I would be interested in your readings to use as a comparison.

Many Thanks
Justin

[Larns]

Na the factory turbo (without tweaking the pump) only has 5psi output, havn't seen the need, even in darwin.

[rick130]

it's not the boost that ups EGT, it's the fuel.

[Larns]

Yea I know, the fuel also controls how much boost as well. Hence why I said mine hadn't been tweaked. I'm only refering to the factory Isuzu turbo too, they didn't have a wast gate and were a matched turbo to the motor.

[Larns]

Hay Justin, should be getting my converted 85 bellhousing back this week:arms: . 'Hopefuly it won't be too long and I'll have the 380 in yay, and hello to easy crusin.

[justinc]

Hi Justin its Justin,

I have tweaked and de tweaked mine, as I had 10psi and 630 Deg. (Upstream) for a while with the auto in, now with the LT95 I can get heaps more performance and see only 500 to 540 Deg. and get about 25 to 27 mpg.

I still get around 10 psi at the manifold, because this is where I have the wastegate actuator line plumbed in.

The non wastegated factory turbo's are important to set up with a pyro and boost gauge, as they can overspeed and over fuel/temp if too much tweaking is done. Having said that, I would move the factory fuel setting about 1 turn (screw out, not in like the Tdi) and see what it feels like. 1 turn isn't a lot, as I have moved mine 3 and can only get 620deg, and this is with 460,000km old injectors!!!

I recently fitted a 4BD1 turbo , huge front mount intercooler and Santana to a 130 Dcab, and after initial running we upped the fuel 2.5 turns, and it'll now climb hills like you won't believe, even in 5th. Very happy with its fuel economy too, currently using less than the 300Tdi that came out. ( Primarily due to the small capacity engine being asked to do too much, this is one heavy 130.)

JC

[def-90]

hey justin,

mate haven't forgot i still owe you some knead it.

mate mine runs at about 600ish with a long run uphill, can get it to go higher (for a few sec's) but usually at the top of the hil by then, and cools very quickly.

running factory garrett turbo (around 12 - 13psi when up it)and turned the fuel up and down that many times can't remember where it is. around town usually sits on around 200 - 300 deg. have a smalll i'cooler top mount, and pyro is at half way round the dump pipe 90' bend from turbo.

any help


sam

[DRanged]

Gday guys


Many thanks for your readings. The reason I asked is, that since fitting a TD5 turbo ( M20 Garrett from memory) and changing my injector nozzles to the turbo nozzle, my EGT readings are higher than that of other diesels. But after seeing everyones readings they are within the norm. Before this I was running a non wastegated Switzer Turbo at around 6-8psi.

Sam if your readings are after the turbo, and thats what your guage says you are running big temps in your turbo.:o Are you going to the joint club trip to the Springs???

Justin, I am running 10psi at the inlet, after the I/cooler, and have forgotten how much I have wound the fuel out, but it pulls like a train. My t/couple is just before the inlet to the turbo upstream. It sits on 400 - 450 around town under acceleration, and can go into the high 600's when chasing a TD5 up a hill:D they just cant pull from 800rpm hey.

Larns, hope you get your R380 going soon. Give the 75/85 Transmax a go in it. I have tried all sorts and so far its the quietest. I am considering using my old auto trans cooler and pumping the g/box oil through it as well.

Thanks again guys

PS will have some Isuzu power steering bits for sale soon if needed.

Justin

[justinc]

Gday guys


:D they just cant pull from 800rpm hey.



Justin

:D :D :D :D :D :D :D Aint that the truth!!!

[isuzurover]

Yea I know, the fuel also controls how much boost as well. Hence why I said mine hadn't been tweaked. I'm only refering to the factory Isuzu turbo too, they didn't have a wast gate and were a matched turbo to the motor.

Your 5psi value is not quite correct. As I posted previously on OL:

1988 and Earlier engines were fitted with an:
IHI RHB-6 (with wastegate). The wastegate opening pressure (boost pressure) was: 680mmHg = 13.15 psi = 0.91 Bar

1989 and Later engines were fitted with a Garrett T-25 with NO WASTEGATE. Maybe this is where the erroneous 5psi boost figure came from, but I don't see why these would run lower boost than the earlier engines.

[def-90]

hey justin i never let it run really to 600, that was just to test it a few times to see how long it takes to get that hot, i would have thought that 200-300deg round town would be ok, normally on the freeway doing 100kph or so she sits at about 300deg.

you think these temps are too high?

[DRanged]

Are these adjusted temperatures ie the differance between the temp in the dump pipe is 75 - 100 deg lower than temps before the turbo. Mine runs the same temps as yours, but mine is measured before the turbo.

If I can get my brakes working ( fitting a 92 Disco booster and m/cylinder) I will see you at the springs if you are going.

Justin

[def-90]

hey justin man i'd love too but gotta work monday and mates party on sat nite, bugger not happy:mad: try and make meeting trow nite again

[def-90]

oh yeah no they are not adjusted temps thats my readings, post turbo. about 3".:(

'others' have told me this should be ok?