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Old 10-12-2017, 04:39 AM   #1
7075T6

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High EGT,s on HX55 WM, 4x560 diesel endurance raceboat

Need some advice..

Iīve got the FPT 6,7-560 engines in my raceboat.
Very similar to the Cummins 6,7 but slightly different bore/stroke and 3150 rpm ceiling vs 3300 on the Cummins.
Also low c/r at 14,1:1.

Need another 50-60 hp/engine to get the boat running the way I want.
That shouldnīt be a problem. But.. Also need more power at low revs to get the boat on plane easier.

That is the issue when you need to go from zero to 100 mph in one gear and have 3150 rpm to play with..

Cool seawater and large heatexchangers/oilcoolers keep the water and oiltemps at ok levels.

The problem is the EGT-numbers. After only a minute at WOT the EGT,s reach 1350-1400 F.
Then I need to go below 2800 rpm for a while to cool things down.

Depending on seastate the engines are under full load for long periods as enduranceraces can last several hours.

Turbos are Holset HX55WM, gated, 41 psi boost.
Watercooled turbinehousings and T3 waterjacket flanges.

Canīt find any data but measured them:

Comp 100 mm exd, 70 ind
Turb 96 ind, 71 exd

Donīt know the size of turbinehousing. 14? Se pic.

Any ideas out there?
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Old 10-12-2017, 10:58 AM   #2
tall boy

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1350-1400 F EGT before or after turbine?
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Old 10-12-2017, 11:15 AM   #3
7075T6

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Quote:
Originally Posted by tall boy View Post
1350-1400 F EGT before or after turbine?
Before. FPT say max 1350 but the derating in the ECU is set at 1500F.
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Old 10-12-2017, 11:24 AM   #4
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i'm not familiar with your engine or how boats work. however excessive heat at WOT relates to two things. too much fuel at WOT or not enough turbo.

can you back off some fueling above 3000rpms? just enough to pull the heat out of it? that would be the cheapest fix. a little tuning with the ol laptop goes a long way.

what is your drive pressure? if your housings are to small you could be choking up the exhaust to much and building heat instead of power. again by loosing a bit of potential over fueling up top DP would go down. if you are seeing high drive pressures this might help. just because you take a bit of fuel away doesn't always mean you loose HP.

If drive pressures are too high which means your housings are probably to small for those rpms, would it be possible to install external wastegates somewhere in the exhaust, or modify your current housings to flow better? this would allow the engine to breath from a bigger straw and free up some ponies and loose some heat/drive pressure.
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Old 10-12-2017, 11:29 AM   #5
12vchevydually
 
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I understand it's a water cooled housing but that exhaust housing looks restrictive!
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Last edited by 12vchevydually; 10-12-2017 at 11:36 AM.
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Old 10-12-2017, 11:31 AM   #6
7075T6

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Quote:
Originally Posted by turbo2387 View Post
i'm not familiar with your engine or how boats work. however excessive heat at WOT relates to two things. too much fuel at WOT or not enough turbo.

can you back off some fueling above 3000rpms? just enough to pull the heat out of it? that would be the cheapest fix. a little tuning with the ol laptop goes a long way.

what is your drive pressure? if your housings are to small you could be choking up the exhaust to much and building heat instead of power. again by loosing a bit of potential over fueling up top DP would go down. if you are seeing high drive pressures this might help. just because you take a bit of fuel away doesn't always mean you loose HP.

If drive pressures are too high which means your housings are probably to small for those rpms, would it be possible to install external wastegates somewhere in the exhaust, or modify your current housings to flow better? this would allow the engine to breath from a bigger straw and free up some ponies and loose some heat/drive pressure.
Donīt have the drivepressure readings. Will make fittings for sender during winter. Bit tricky with the watercooled housings.
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Old 10-12-2017, 11:34 AM   #7
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you say your gated at 41psi but what total boost are you seeing at WOT?
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Old 10-12-2017, 11:45 AM   #8
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We did a pair of turbochargers for a twin 3406E engine race boat on lake michigan. His requirements were 1000hp per engine and lightning fast response. You boat guys sure make it tough on us turbo guys Luckily SIS (cats parts program) made it a little easier on us as they at least give SOME info on the turbochargers.


Can you measure the turbine wheel? There are quite a few flavors of turbine for the HX55 turbochargers. A simple turbine upgrade can do wonders.
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Old 10-12-2017, 11:46 AM   #9
7075T6

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Quote:
Originally Posted by turbo2387 View Post
you say your gated at 41psi but what total boost are you seeing at WOT?
Sorry. 41 is total boost at WOT.
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Old 10-12-2017, 11:47 AM   #10
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and where are your gates set?
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Old 10-12-2017, 12:59 PM   #11
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Pressure when they open? Donīt know that.
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Old 10-12-2017, 01:05 PM   #12
7075T6

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Quote:
Originally Posted by zfaylor View Post
We did a pair of turbochargers for a twin 3406E engine race boat on lake michigan. His requirements were 1000hp per engine and lightning fast response. You boat guys sure make it tough on us turbo guys Luckily SIS (cats parts program) made it a little easier on us as they at least give SOME info on the turbochargers.


Can you measure the turbine wheel? There are quite a few flavors of turbine for the HX55 turbochargers. A simple turbine upgrade can do wonders.
Ok. Here.
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Old 10-12-2017, 01:06 PM   #13
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Is there any adjustment on your wastegate? Ideally I would look into a twin turbo setup. Faster spool up with greater top end flow.

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Old 10-12-2017, 01:09 PM   #14
7075T6

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Quote:
Originally Posted by badbowtie View Post
Is there any adjustment on your wastegate? Ideally I would look into a twin turbo setup. Faster spool up with greater top end flow.

Sent from my SAMSUNG-SM-G930A using Tapatalk
Adjustment,yes.

Twin turbo. No..LOT of work and money with 4 engines..
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Old 10-12-2017, 01:15 PM   #15
badbowtie
 
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I get budgets, but it really is the best of both worlds. I would try to tighten down your wastegates just to see if more air would cool your egts , or if it will just be too hot to help. The only downside is even if it helps on top it won't affect the bottom end at all.

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Old 10-12-2017, 01:35 PM   #16
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you should test each wastegate with compressed air and see when the gates are actually opening.

are they functioning
are they staying closed too long
are they opening too soon
are the diaphragm's leaking?

also. how much HP are these engines making?

Last edited by turbo2387; 10-12-2017 at 01:36 PM.
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Old 10-12-2017, 01:40 PM   #17
7075T6

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Quote:
Originally Posted by turbo2387 View Post
you should test each wastegate with compressed air and see when the gates are actually opening.

are they functioning
are they staying closed too long
are they opening too soon
are the diaphragm's leaking?

also. how much HP are these engines making?
Will check gates. Diaphragms should be ok. Only 30 hours on the engines.
560 hp at 3000 rpm.

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Old 10-12-2017, 01:43 PM   #18
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70/71/??? is gonna be close at sustained HP controlling temps.

to temps creep up or shoot straight to 1400*
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Old 10-12-2017, 02:42 PM   #19
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There is 80mm exducer turbine for HX55, flows over 900 hp.
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Old 10-12-2017, 02:50 PM   #20
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OP looks like you have the 86x77 turbine. As mentioned there is an 86x80 available as well. As long as the turbine housing isn't an issue we could easily upgrade those on both ends if desired.
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