HX35 mods

[D-dog357]

I have a 12cm 35 housing that I will be putting on my H1c. The plan is to cut out the divider hoping to accomplish two things.

First is to get close to the flow of a 14cm as it's a DD with mild towing.

Second is to allow the WG to bleed all cylinders evenly.

Do you think that size turbo would control the smoke from 5X12's ?

Has anybody tried this mod before ?

[Tacoclaw]

Twin scroll housings are actually really good at getting and keeping a turbo spooled, I wouldn't cut the whole divider out. I would port the WG hole and drill a hole through the divider though.

[PToombs]

Do you think that size turbo would control the smoke from 5X12's ?

Nope! Not even close!

[Remps]

If mileage is a priority 190's or maybe a 5x10 injector would be good. Although I think 5x12's would work if you tuned the pump to not push more than 30ish psi boost. I think if you never plan on going bigger than an hx35, the 5x12's aren't needed. Doesn't Philip tow with 6x16's and an HX40? I doubt his pump is turned up at all.

[dazedandconfused]

If mileage is a priority 190's or maybe a 5x10 injector would be good. Although I think 5x12's would work if you tuned the pump to not push more than 30ish psi boost. I think if you never plan on going bigger than an hx35, the 5x12's aren't needed. Doesn't Philip tow with 6x16's and an HX40? I doubt his pump is turned up at all.

I thought his were 6x18's.

[D-dog357]

TC - part of the idea in removing the divider is to let the WG work evenly on all cylinders and not have unnecessary turbulence from cross drilling etc. Perhaps I should just remove the divider to a point just past the WG and leave the the rest of the snail alone ?

At this point I plan on nothing larger then a 60-62mm comp up grade when I have some spare cash . As we all know these trucks have a way of knowing when we either have a few extra bucks or none at all. Either way they want their pound of flesh so it might be awhile.

Just looking to make this beast do a little work and not get past by a Yugo.

Looks like I might have a set of 5X12 nozzles up for barter if this turbo wont keep the smoke in check.

[D-dog357]

BTW; does anybody know if these
( http://compare.ebay.com/like/1210753827 ... s&var=sbar ) OR ( http://www.ebay.com/itm/Holset-H1C-H1d- ... 33?vxp=mtr )

e-butt rebuild kits for the H1c are worth a bucket of piss ?

Do I really need new hardware for the turbo too or just the bearings.

[Sutter1stgen]

We ported my wastegate opening and drilled a quarter inch hole in the devider. That was all it took to help out. For gasket reasons I'd like to leave the devider alone at the flange. Just for the sake of engineering. I ordered a 7blade 60mm compressor wheel and housing through BAE. Its helped cool a little more. When I ran my hx35 as a single I found my 190s to be a good match. A little bit more power, and a clean burn with added milage. Before I knew what I know now, I put down 255/555 torque through a slipping non lockup converter, with 35/14.50 tires. And it burned clean.

[skilletky]

Looks like I might have a set of 5X12 nozzles up for barter if this turbo wont keep the smoke in check.

i drove mine for a bit with 5x12's and a stock turbo. if you have yer ip screw set right, it is somewhat possible to control the smoke. but it is no fun driving like that. i put on a 62/71/14 and it was still smoky. i think if i would have kept the exhaust wheel at 65mm and maybe a 13cm housing, it would have spooled up faster and helped control no/low boost smoke.

[PToombs]

There has been some discussion of exactly what Philips injectors are. They don't barely smoke, and the EGT's are manageable. Nobody has had the balls to sneak 1 or 2 out and take them to a fuel shop to be checked.

[oldestof11]

The way he drinks dew, there ain't enough time between the trips to town for the next 2 liter.

If you take out the divider, might as well put the 18cm housing on. The turbulence induced by an undivided housing is not helpful. Look up on google on the spooling difference between an undivided .88 housing and the divided .91 housing on a S300 63/68. The bigger one spools faster.

[D-dog357]

Interesting that a 1/4" cross drilling of the divider helps balance the EG flow. Yet it is also said here that I should port the 3/4" gate hole larger. Not trying to argue as I know almost nothing. Yet what little I know about fluid dynamics would say that the divider starting AFTER the WG would give a better flow and balance to the system and a 1/4" cross hole would mostly create turbulence. I understand that a divided housing would give better spool-up as the divider in the snail increases EG velocity going in to the wheel. That said I've read many places that a undivided housing is only equivalent to a 2cmm increase in size - not 6cm.

Remember folks my first Q on this thread was if anybody had tried this ??

Don't get me wrong I truly appreciate all comments and advice - THANK YOU one and all.

[Sutter1stgen]

A external waste gate is perpendicular to flow in the manifold or hot pipe. There is a rough 90degree for the exhaust flow to travel through to releave pressure. I know it's not a smooth mandrel bend, but they work. Well drilling that small hole helps a lot. I like to leave as much cast as possible when it comes to a part dealing with that much heat. Insure it's no big deal, but it's just me.
Here's a crude example. The gasket between my hotpipe and top turbo blew a 2" section completely out. Its .043" thick I believe. My primary was only making 20 psi of boost. Now with that section missing it was roughly the same area as a 3/16" diameter hole. Not very big right? Well when I replaced the gasket my primary boost went up to 35psi. It was a smal hole, but made a huge difference. You could drill a larger hole if you'd like. Its just what I did.

[D-dog357]

On the topic of suggested nozzles - does anyone know the specs on 190's ? The injector list has no info. I know they're "a smaller yet more efficient nozzle" but that's all.What kind of power can they make ? I was thinking about some 330's - 5X11 = 20% bigger than stock. What are they like ?? Or even the 215's - 5X10 which are only a fart bigger, about 5% in size but would flow a tad bit more then that because of less turbulence/surface friction.

I know most of you guys are looking for balls to the wall power so you might not have even looked at these, but I won't know if I don't ask.

Keep in mind I'm only shooting for around 250hp and keeping the EGT's under control (famous last words - LOL) and at most, will be only up-grading the turbo using the stock H1c with the HX ex housing and most likely a 62/86 BAE comp or something like that.

You know keeping it cheap

[Tacoclaw]

The 'gate is simply pressure relief, it flows from an area having at least 30psi of extremely hot air to one having 0psi of much cooler air, the downpipe. As Stutter said, when I had 2 exhaust gaskets start leaking on my twin set, you may as well have taken the things off there. Three, tiny cracks you probably couldn't get a piece of paper through we're dumping enough exhaust pressure to make a 62/65/12 spool worse than the 67/71/14 on there now.

I did the roughly same thing as you, ran a stock H1c cold side with an HX turbine housing with my ported head, cam, and 5x14 injectors. I could bury the pyro, but it would 'gate right off at 35psi and not go any higher.

After I widened the 'gate hole and carried it right through the divider. There wasn't much use in me doing that, as I had a 1" undivided spacer still on there from my twins, but I did.

I'll also say that I wasn't impressed with its spooling, I think my old 18cm housing spooled faster than that setup, and is almost guarantee it was because of that 1" piece of missing divider. Twin scrolls were made to help spool turbos, cutting any real amount of it out will completely negate that.