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Old 09-08-2012, 02:02 PM   #1 (permalink)
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Turbo Setup For Towing/Twins

Hello Everyone, I need some help here. A few days ago my hx35 decided it had enough and the compressor started rubbing the inside of the cover. So, i went and had a very reputable turbo supplier and engine builder put together what they thought would be a great turbo for me. Its not working so great. My egt's are up and it is laggy as hell... The hx35 would light early and do a good job for the towing i do. They thought stepping up the compressor size and turbine housing size would drop my egt's but its went the opposite way.

They basically built me a hx35 with a 60mm compressor, stock turbine wheel and 14cm turbine housing. With the stock hx35 with a 12cm housing i could tow my 12k 5th wheel and keep egt around 900-1000 on the flats and 1200 on a pretty good grade as long as i kept it in drive and the hill wasnt too long. Now i will hit 1200 before i get to 45mph and that is with a pretty light foot. Once i finally get up to speed i can barely keep it below 1100 on flat ground and pulling a hill is a nightmare.

I am going to build my twin setup (? / HT3B) as soon as winter hits but until then i would like to use the truck and camper a few more times. I hate to just put a stock hx35 back on if there is something a can get that would perform better both as a single and in a compound setup...

Would a 12cm housing help me? I am thinking the 14cm is causing the turbo to not light early enough and that is whats getting my egts out of hand.

Any advise on turbo sizing for a really great compound setup that can tow would be greatly appreciated.
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Old 09-08-2012, 04:04 PM   #2 (permalink)
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The 14cm housing is too big to spool, that's where your egt issue is.

You could do hx35/s400, s300/s400.
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Old 09-08-2012, 04:22 PM   #3 (permalink)
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I already have a ht3b to use for an atmospheric charger. Would a 12cm housing on the current (60mm) turbo yield better performance for towing than the hx35 did as a single? Would it be better in a twin setup also? - Thanks Scott
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Old 09-08-2012, 04:30 PM   #4 (permalink)
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I think you'll be better of wIth a 12cm housing. You want the small charger to spool fast. If I ever did a twin set it would be with the stock hx35.
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Old 09-08-2012, 04:43 PM   #5 (permalink)
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The 14cm on the HX35 is a desirable housing for use in twins, it'll spool pretty well and be able to help out the big turbo to support more power. Once the wastegate opens up on your 35/40 hybrid it'll lower the EGT a lot. I'm using an HX40 with an 18cm housing over an HT3B with no problem, it starts to light at 1500 RPM and makes over 20 psi by 1750 RPM.

What's the housing size on the HT3B? A larger 26cm housing would work better with the 14cm, but a 22cm housing would be a good match for a 12cm housing on the secondary.
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Old 09-08-2012, 07:38 PM   #6 (permalink)
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I would go with a 12cm housing on which ever turbo you choose, twin or single as they spool better down low. A 35/ht3b combo has been time proven to be a good all a round set up. Just reuse the stock exhaust housing and spool will be quicker and EGT will come down.

A 14cm housing lowers EGT at high rpm, but spools slower and makes for higher temps down low where you tow.

If you are certain you are going to do twins, go with a super B. while it is not a big improvement over stock as a single, the wastegate flows much better and makes it about the best secondary you can get in a twin set up.

If you want a single that will do well towing and make room for more power later, a 62/65/12 is about the best all purpose single going. It works well in a twin set up, but will not spool as well as the 35 or super B.
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Old 09-08-2012, 10:13 PM   #7 (permalink)
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If your complaining about it spooling as is, you should go back to a Hx35/12. Once you put the 3B on, the 35 will light slower.
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Old 09-09-2012, 08:52 PM   #8 (permalink)
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Thank for the info guys, i really appreciate it.

So, does it make any since at all to stick with the 60mm compressor and go to the 12cm housing? Or, will this cause me problems when i install the twin setup since the compressor is larger/heavier than the hx35?

Also, i'm not sure what the turbine housing size on my ht3b is. These are the numbers cast into the housing (696290-32) (OUC-B) (F1 B11). Does the 32 mean it has a 32cm housing? If so, that seems really big???

I bought it because it was advertised as being a perfect candidate for a 5.9 Cummins compound turbo setup...

Thank again guys - Scott
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Old 09-10-2012, 03:13 AM   #9 (permalink)
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The 60 wheel should be just fine in a twin set up, but if spool up is the issue go back to the 12cm housing and your problem will be solved.
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Old 09-10-2012, 05:50 PM   #10 (permalink)
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I'm 90% confident that the housing on your HT3B is a 32cm. That will be pretty laggy, I'd recommend searching for a 27cm or smaller. If you can't find a housing in a reasonable amount of time then it'd be best to run the 14cm housing on the secondary, a 12cm over over a 32cm would be a terrible match. The 32cm will light, it'll just be lazy on the bottom end, but it'll hit hard in the higher RPM.
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Old 09-11-2012, 10:58 PM   #11 (permalink)
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I'm taking my 60mm turbo in tomorrow and having it swapped for a 58mm compressor and 12cm turbine housing. I would also like to get the turbine housing on the HT3B swapped out while i'm there. Would a 23cm housing work better for me since i do tow 12k fairly often? I can live with higher egt's while drag racing or sled pulling (1600* or so) - But i really do need it to tow well and keep egts under control while towing. I am thinking i need the smaller turbine housing to spool sooner and keep egt's at bay. Am i looking at this the right way? - Thanks again - Scott
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Old 09-11-2012, 11:36 PM   #12 (permalink)
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The 23cm would be a good match with the 12cm secondary. I recommend porting the wastegate on the 12cm, this will help when racing.
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