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Tell me about your GT3794 HTA's

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urbansmoker1 said:
I dont expect to get it until february honestly. They said 2-3 months?




Cause the turbine is effin huge and it will lag for me like none other.

I bought the hx52 for rebuild experience. I never really planned on running it.....

I mean look at this

3794 specs
Compressor- 67/94
Turbine- 72.5/66.5

Hx52 specs
Compressor 71/98
Turnine 70/84

As you can seeeeee the hx52 is really a huge mofo i dont wanna mess with. Plus it's twin scroll and I'm not.


So not only is the 52 laggier it's also larger and makes less power than the 3794 as well as might cause engine bay space issues.

The 37 fits in a 35r config.
Click to expand...

From a fitment perspective, the 3794 is a logical choice compared to the list of things you would need to fit the HX52 on your current setup.

Couple things though.. it really is not very laggy given the size of the turbine wheel. The 16cm^2 housing is very well matched. This was done for OE Emissions requirements on the trucks they are found in. You need to get airflow up early to keep things clean.

My own car reflects this, I have very tall gearing and almost non-existent back-pressure however.

We don't actually know if the HX52 (67/99 or 71/99 wheel) will make less or more than the 3794's 67/94 wheel or it's direct competitor.. the 6766.

This is because we've not had anyone share results of boost in the 40s let alone mid 50s like, Devin's Test:
PTE 6766 vs. FP 3794 - 5 different boost levels - Boostin Performance - evolutionm.net

The best either did at 37-38psi was 796, where two HX52s on Stock 1G Intake Manifolds and "small" cams have passed 800whp at that level and a couple thousand rpm earlier. One of which made 816whp. A third HX52 car with a non-stock IM made 775whp at 30-31psi.

I'm making ~23whp/psi boost and not even in this turbo's sweet spot yet nor is my tune anything but conservative at this stage. Also on OE Replacement pistons.. etc. Excuses, excuses Right? LOL

Just saying, don't count the big guy out just yet. ;) To use your own words "you might be surprised."

FWIW, it would actually be a "6770" or "7170" to use PTEs nomenclature.
 
urbansmoker1 said:
I drive it on weekends but i have a daily driver. The dsm is basically gonna end up a dragster. And i never have a hp goal. But the 3586 is basically same size as hx40, and i know i want growing room. So why buy a 3586 and then upgrade to a 3794 when i could just grt the 3794 first especially sinxe they cost the same.

I habe no problem with 30psi by 5500

I do have a problem with 30psi by 6k

But again, she will 2 step launch at 6k rpm and be anywhere from 5k-8500 at the track. Does this sound like the turbo for me? I'll probably be fine with 800hp as an end goal, and i worry about constant motor rebuilds and broken things. Im not on an unlimited budget....but when i get there to 800hpwho knows if itll get boring. The 3586 would be pushed to the max to make numbers like that.

I don't see a point in a 700-900hp street car, your asking for license suspensions and a trip to the crusher.

The 3794 is safe to say the largest turbo I'll ever put on my dsm.


Sort of wish FP offered like a...... 37r turbine maited to a 64/88 compressor. But sadly the hta88 is a 67mm as well.

I sort of feel there is a gap needing to be filled where the pte6466 lives. I'll just never put another pte turbo on my car again.
Click to expand...

Just so you , a 42r on a 2.0 will give you 25-30 psi but 6k in 3rd gear
 
Yeah this turbo doesnt have a 42r turbine though. Appreciate your spool numbers from another large turbo with the same compressor spec

I was just looking at the hx40 specs and came to realize the 3794 should spool very similarly to the hx40 the only real extra lag i see is cause from the larger compressor wheel, check this out
Hx40
60/86 74/64

3794hta
67/94 72.5/66.5

The hx40 has a larger turnine exducer! I was reviewing a video of my car with the hx40 and saw wastegate open 28psi 5k something tells me the 3794 is very very close behind packing a shit ton more punch.

Just thought is bring up this interesting observation.

That said, i would predict the 3786 to spool spot on with the holset
 
Last edited:
urbansmoker1 said:
Yeah this turbo doesnt have a 42r turbine though. Appreciate your spool numbers from another large turbo with the same compressor spec

I was just looking at the hx40 specs and came to realize the 3794 should spool very similarly to the hx40 the only real extra lag i see is cause from the larger compressor wheel, check this out
Hx40
60/86 74/64

3794hta
67/94 72.5/66.5

The hx40 has a larger turnine exducer! I was reviewing a video of my car with the hx40 and saw wastegate open 28psi 5k something tells me the 3794 is very very close behind packing a shit ton more punch.

Just thought is bring up this interesting observation.

That said, i would predict the 3786 to spool spot on with the holset
Click to expand...

Exhaust Manifold, Intake manifold, Cams, and the exhaust system all play a roll in how it will spool up and overall TORGUE production. I have a 4 inch full turbo back exhuast on my car. I SWEAR IT SPOOLED FASTER WHEN IT WAS JUST A TURN DOWN ON THE CAR, without the exhuast.
 
Any turbo should (generally) spool faster if you decrease exhaust pressure. Im sure with that 4"(!) pipe you dont notice TOO much difference in spool vs a straight dumped dp, right? Thats a big ass exhaust. But, with turbos, bigger exhaust is always better
 
^^^ Now thats what IM talkin about. Looks nice too. F backpressure!!
You build that? I was looking at your welds in another thread(sorry off topic here) and it really is making me want to get a TIG and go down to the local community college for a course over the summer. Sure would be nice to have that skill. Id still have to learn about all the angles and pie cutting, stuff looks complex, but i wouldnt have to find a shop if i wanted to change things up.

Hows the weather up there? LOL. My garage is done, ready to start my build thread but damn its cold, im waiting it out a bit more. I have to get a bunch of tools still and mount my heater/plumb the LP lines etc. Too cold, too lazy.
 
boost97gst said:
^^^ Now thats what IM talkin about. Looks nice too. F backpressure!!
You build that? I was looking at your welds in another thread(sorry off topic here) and it really is making me want to get a TIG and go down to the local community college for a course over the summer. Sure would be nice to have that skill. Id still have to learn about all the angles and pie cutting, stuff looks complex, but i wouldnt have to find a shop if i wanted to change things up.

Hows the weather up there? LOL. My garage is done, ready to start my build thread but damn its cold, im waiting it out a bit more. I have to get a bunch of tools still and mount my heater/plumb the LP lines etc. Too cold, too lazy.
Click to expand...


Hows the weather??? It's -6*F it sucks balls. Yeah i welded that pipe up, pie cuts are actually real easy if you have a chop saw. :thumb: welding is alot of fun. I'm trying to get a job in race fabrication.
 
urbansmoker1 said:
Yeah this turbo doesnt have a 42r turbine though. Appreciate your spool numbers from another large turbo with the same compressor spec

I was just looking at the hx40 specs and came to realize the 3794 should spool very similarly to the hx40 the only real extra lag i see is cause from the larger compressor wheel, check this out
Hx40
60/86 74/64

3794hta
67/94 72.5/66.5

The hx40 has a larger turnine exducer! I was reviewing a video of my car with the hx40 and saw wastegate open 28psi 5k something tells me the 3794 is very very close behind packing a shit ton more punch.

Just thought is bring up this interesting observation.

That said, i would predict the 3786 to spool spot on with the holset
Click to expand...

Its easy to compare wheel sizes and try to make a direct correlation to how its going to spool. The compressor wheel itself is just as important as the turbine side and I find the turbine side is damn near just as important to make good power per lb of boost. With that being said you may spool a slightly slower but I would bet on a dyno you would make less power/lb until it is lit up which would move peak torque to the right. Just my 2 pennys.
 
I agree with you it moves oeak torque to the right, a sacrifice I'm willing to make for more power. I think itll still be fun on the street for a turbo it's size, plus when people look at it they will think it's a regular 35r :sneaky: but it has tricks up it's sleeve.

What sort of fuel setups are you guys running with this turbo? -8 feed walbro 450? Dual 255's? Single weldon? Mechanical?

I was thinking a walbro 450 and if i needed more put an 044 inline.
 
We had 2 aeromotive 340 lph intank with -6 feed and return lines with ID 2000 injectors and at 928 whp we still had enough fuel system for about an extra 100 whp or so.
 
Thats good to know, 680lph supports 1000hp. So i should be good with a 450 and a 044 thats like 700lph
How much boost were you guys running to make 928. And was that on stock 6bolt? You guys have done crazy shit with this turbo.
 
Why don't one of you guys try a G3782va/powerstroke turbo? You can use a bunch of different ways to control the variable vanes, the solenoid works like a window switch, power one side and it opens power the other side and it cloeses. When the vanes are closed it makes the exaust housings AR around .4 and it opens up to .90AR, so it should spool really fast. 66/72mm turbine and if you want the powerstroke turbo guys bore the housing for a GT40 wheel 78mm I think. They do use a Vband turbine inlet like the tial housings so the manifold would be a pain and the oil outlet is funky(gotta get the drain tube from Ford and braise it in there. But you can get the stock58mm 62mm 64mm and 68mm(found the cast 68/94mm for 30 bucks apiece new) wheels for them. There is a powerstroke turbo guy that mods the stock compressor cover to fit all those wheels or you can get the .96ar cover that fits over them without modding for $250. I have two of them I am gonna get the 68mm wheels installed on for a twin turbo mustang. The best part is they are cheap either new or takeoffs. I got mine for 100 apiece. So with a rebuild and a balance with the new wheel and a new or modded compressor cover you save enough to have a manifold built and new exaust built and probally put a billet wheel in there and you get the spooling benefit of the Variable Vanes. Seems like a win to me.
 
smokehouse_83 said:
Why don't one of you guys try a G3782va/powerstroke turbo? You can use a bunch of different ways to control the variable vanes, the solenoid works like a window switch, power one side and it opens power the other side and it cloeses. When the vanes are closed it makes the exaust housings AR around .4 and it opens up to .90AR, so it should spool really fast. 66/72mm turbine and if you want the powerstroke turbo guys bore the housing for a GT40 wheel 78mm I think. They do use a Vband turbine inlet like the tial housings so the manifold would be a pain and the oil outlet is funky(gotta get the drain tube from Ford and braise it in there. But you can get the stock58mm 62mm 64mm and 68mm(found the cast 68/94mm for 30 bucks apiece new) wheels for them. There is a powerstroke turbo guy that mods the stock compressor cover to fit all those wheels or you can get the .96ar cover that fits over them without modding for $250. I have two of them I am gonna get the 68mm wheels installed on for a twin turbo mustang. The best part is they are cheap either new or takeoffs. I got mine for 100 apiece. So with a rebuild and a balance with the new wheel and a new or modded compressor cover you save enough to have a manifold built and new exaust built and probally put a billet wheel in there and you get the spooling benefit of the Variable Vanes. Seems like a win to me.
Click to expand...

Have any non-diesel results you can link us to?
 
Nobody is using them cause they are scared of the variable vanes, but you can weld the vanes open and have a gt37 turbo for nothing. They are even cheap brand new 6-800 bucks, I think you can get the 62mm version for 900. If you google GT3782VA you can find some posts from a guy using one on a mazda 626 and one on a single mustang, but thats about it. I am goin to control mine with a megasquirt(to have the vanes open slowly off the line, but you can use a throttle switch or hobbs switch to open the vanes at a set point.
 
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