Larger Turbo vs. EGT's? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 24 (permalink) Old 03-20-2008, 11:16 PM Thread Starter
 
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Larger Turbo vs. EGT's?

Howdy folks, I just put another turbo on my truck and my exhaust temps have me very puzzled. My mods are in my sig and nothing has been changed except turbos. When I was on my stock turbo I could push it to about 55 psi, but my exhaust temps were only around 1600 tops. Then I went to a plain jane s300 with a ported 16cm housing, it ran hotter than the stocker during normal driving but on top it also ran about 100 degrees hotter, would make about 40 psi of boost. So tonight I installed a B-1 62-14 charger, in hopes of cooling down up top a little. Well much to my suprise I took off for my test drive and pegged my 2000 degree pyro at about 45 psi of boost. What am I missing here folks? I'd always understood that a larger turbop while it'll run hotter down low will cool better up top? Can anyone please explain what's going on here? It's got me flustered cus at this point I was honestly happier when my stocker was in.
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post #2 of 24 (permalink) Old 03-21-2008, 02:00 AM
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What do you have for an air filter and exhaust system?

Do you have 3.55 or 4.10 gears?

What RPMs are you turning when hitting 45psi/2k EGTs?

All of the engine mods are in my sig. Never seen over 1300* at 38#. Have 4.10 gears.

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post #3 of 24 (permalink) Old 03-21-2008, 02:55 AM Thread Starter
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BHAFfor the filter, full 5" exhaust from downpipe back, 3000-3200 rpm when these temps were reached.
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post #4 of 24 (permalink) Old 03-21-2008, 02:58 AM Thread Starter
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oh and 3.55 gears
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post #5 of 24 (permalink) Old 03-21-2008, 11:33 AM
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Forgot to ask, what are your injectors equivalent to? And, are your temps towing or empty?

"Some people are educated beyond their intelligence."

'93 W350 CC, LE, 5spd, HTT modded H1C, 4" DE

Sold- '99 3500 Q/C, SO CTD, 4x4, 5spd.

Traded off- '97 3500 C/C, 4x4, CTD

'92 W250, LE, CC, CTD w/ tweaked pump (SOLD)


"Obama = Hoax and Chains"

If Obama is the answer, it must have been a stupid question.
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post #6 of 24 (permalink) Old 03-21-2008, 12:42 PM Thread Starter
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Injectors are ~150hp I believe. These temps are empty, about 50 degrees outside.
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post #7 of 24 (permalink) Old 03-21-2008, 04:09 PM
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Quote:
Originally Posted by willy91
Injectors are ~150hp I believe. These temps are empty, about 50 degrees outside.
Sounds like an intercooler upgrade is needed IMO:
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post #8 of 24 (permalink) Old 03-21-2008, 08:12 PM
 
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I would try adding some timing, especially at those rpms

How fast is your fuel coming in? Just a thought, but I would wonder what it would do if you delayed full fuel until about 35psi

Also make sure that turbo is in good shape and someone hasn't clipped the turbine. Thats all I can think of right now, I'm a little stumped too :shrug:
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post #9 of 24 (permalink) Old 03-21-2008, 09:39 PM Thread Starter
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Quote:
Originally Posted by Dual K20s
I would try adding some timing, especially at those rpms

How fast is your fuel coming in? Just a thought, but I would wonder what it would do if you delayed full fuel until about 35psi

Also make sure that turbo is in good shape and someone hasn't clipped the turbine. Thats all I can think of right now, I'm a little stumped too :shrug:
fuel comes in real fast if I tromp it, but it gets real hot if I roll into it also. I had the turbo apart before I put it on, cleaning the housings and such so I know it's all in tact.
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post #10 of 24 (permalink) Old 03-23-2008, 02:31 PM
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How bad is the turbo lag? If a lot of lag, you might need a 12 housing to light it faster. Maybe even try the 13 SS housing. Has bigger 'gate ports, too.

More timing would help some, but won't cure it all.

I would check for boost leaks. I had to use hairspray on all of my intercooler boots. Haven't blown them off since. I also had to replace the o-ring on the turbo to elbow adapter and tighten all of my intake manifold bolts. Some were loose.

May have a leak in the intercooler or one of the boots.

"Some people are educated beyond their intelligence."

'93 W350 CC, LE, 5spd, HTT modded H1C, 4" DE

Sold- '99 3500 Q/C, SO CTD, 4x4, 5spd.

Traded off- '97 3500 C/C, 4x4, CTD

'92 W250, LE, CC, CTD w/ tweaked pump (SOLD)


"Obama = Hoax and Chains"

If Obama is the answer, it must have been a stupid question.
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