Fp hta 3794r?
 

Would like to know what everybody thinks about this turbo? 90 lbs/min?

thanks for the heads up...

from Forced Performance's site...

" The FP HTA&trade GT3794R turbocharger is the next step beyond the FP HTA&trade GT3586R in power production within the GT35R footprint. It combines the greater turbine flow found in the GT37 with the 90lb/min flow rating of the 94mm HTA&trade compressor. The compressor wheel measures 67.5mm inducer and 94mm exducer. The turbine wheel measures 72.5mm inducer and 66.5mm exducer.
This unit has a standard GT35R configuration, so it can easily replace an existing GT35R without modifying the header or manifold. It is available in either 3" vband or 3" 4 bolt outlet. No other turbine housing options are available at this time.

This turbocharger is recommended for applications running 40psi boost pressure that target the 800-900whp range. The FP HTA&trade GT3794R has exceeded 900whp easily during testing as well has running 8's in the quarter mile with trap speeds in excess of 160mph.'

here's my take...

the compressor specs out similarly to my GT4094 which will flow 80 pounds and make 600 SAE rw rotary hp properly tuned.

the hotside is smaller... probably due to the compact GT35 package.

comparatively:

cold side
average area sq inches

GT4094r 8.175

HTA3794 8.148

hotside

GT4094r 6.423 78.5% of cold

HTA3794 5.89 72.2%

the dyno sheet showing 850 hp checks out w the est'd 80-90 flow. 850 * .975 to correct to SAE = 829/ 1.3 to get rotary rwhp= 637 whic h is on the money for 80 pounds per minute.

while the hotside might be a tad small the concept of a 80+ pound per minute delivery in a tiny put in your pocket GT35 18 pound frame is appealing.

i also hold Robt Young of Forced Performance in high esteem.

a neat option. 2011 is going to plow some new ground w re to turbos.

howard

I believe the only current downside is the T3 footprint is all they offer right now.

If it is any help, I will have some good results from the 3586R shortly. I got it on the dyno but I have a pretty serious boost leak from my meth jets on the UIM. I had alcohol spraying 2' in the air.

Anyway back to my point. I stopped the tuning after the leak was noticable bad but I will say that at 21psi (which I am sure the motor is seeing alot less from the leak) my car did not drop off power all the way to 7500rpm. I know people claim the T3 35r falls off top end but not the 3586R so far

This is a rough tune around 17psi but if you look closely at the end on the video you can see the power stay steady. I know the torque isn't showing the darn clamp wasn't on the plug wire correctly my fault.

http://www.youtube.com/watch?v=CDPCl..._order&list=UL

I hear they were coming out with A t4 version pretty soon. Maybe have bigger hotsides. Sounds good

This turbo is going to blow most turbos out of the water. I made good power on my precision 67mm, over 500hp and the spool was fast but can you imagine this turbo when they come out with the divided t4. I dont see why a standard garret housing wont fit? the exhaust turbine is about the same as the gt35r so why not put the exhaust housing on?

Full race twin scroll manifold mated to a t4 3794r hows that sound?

well its official were buying one for the Evo and see how she does

Might get I've for the fd

One*

I have ordered an HTA 3586r with T4 1.00 divided housing and Full Race manifold. In a couple of months i will tell you how it sounds!!!Waiting so long for this set up.....

Boxer2Rotary what housing do you have on your 3586r and what rpm do you see 15-17psi??

It cannot be seen on the dynno. The power seems to be very stable from midrange to top.

I'm pretty sure the 3794r will not disappoint me.

Are u going to use it on a streetport and what manifold would u consider?Try full race divided. A little big in diameter should give you about 200rpm slower spool but you going to have plenty and steady whp all over the range.

i thought about running this turbo on the 7 but if i upgrade its going to have to be bigger. The issue lies in the turbine wheel. the wheel is small like the gt35r, to4z, 60-1 and pt67's but when you start flowing more air like the 37 compressor then you build more back pressure in the exhaust and then that builds heat. Thats why you never see gt40 gt42 gt45 with small turbine wheels. You have to be able to get whats coming in to go back out. And a gt35 framed turbo would not make 700hp like a bigger framed turbo with out alot of work and even at that you still dont see gt35r's making no more than 550hp. Now 500hp is easy on a 67mm turbo so if thats the power goal then it should not be a issue. Just remember our cars flow alot more air than a 4cyl and thats what the gt37r was intended for, not saying it wont work but rotarys flow like 6cyl and 8cyl not 4cyl

It seems very comparable to a BW wheel (smaller inducer with a larger exducer), runs the same turbine as a 37R so pretty close to a P-trim. I would expect the similar response as a 67/65 H-cover. If a T4 can't be fitted I wouldn't bother.

~S~

hes right its like the extended tip theory but if you cant get the exhaust to plow there is no point

My air fuel was 10.5 at the time of the video so spool was weak. I'm going on the dyno tonite and will let you know where I am seeing 15-17psi once I get a good run with mid 11 a/f. I also adjusted my Pim values in ly map so if everything holds together I will see how the turbo is over 23psi.

T3 1.06 housing. For the purpose of comparing it vs the other GT35R T3 variants.

I do not going to compare it with gt35rs. I am thinking how mine with t4 1.00 will be doing!!! Divided manifold I suppose??? Brand?? How about response? What rpms are you see 15psi?

Apparently it has response slightly better than a 6765, and they will be offering the T4. They had so many people asking them to do it, and they had to cave.

630 capable? Can it be done?,

Well on piston motors they have made 800 whp on the t3 3586r and 900whp on the t3 3794r so if you do a t4 for the rotary motors and do Howard's math. The 3586 should do 615 and the 3795 should do 690. That is dividing piston HP by 1.3. Could be way off as I feel 550 tops for 3586 but I will be on the dyno shortly with the 3586 to get some solid numbers on a street ported motor. Video to follow.

Okay the video is from my camera phone so not great but you can clearly see I get 16psi around 3800rpms 4th gear pull road tune 11.2 a/f.

http://www.youtube.com/watch?v=KFhWRWHeKbg

How much power are you making in the vid?

Not sure. Hoping to get on the dyno by this weekend. Car goes good, holds boost past 7500rpms. I will post results soon.

It is not good video but we get the point. 16psi at 3800rpm. I am going to use full-race's manifold which will have aproximatelly 200rpm slower spool due to large primaries. The difference from your setup is that i have t4 divided exhaust housing and manifold and two wastegates that suppose to give me faster spool and better boost balance. So hopefully i am going to spool same as you. Any porting job on yours?

I have a Dave gibson street port (not sure how large that is). the exhaust ports are ported pretty good as well. I have the 1.06 housing which is a slower spool than an .82 would have been.

I am suppose to head to my buddies dyno tonight if he gets back to the shop in time. I will have good quality video with a flip camera at that point. I will keep you posted on the thread.

Is this your setup you are going to have? If you read down a bit to "uncle harry's" post he gets 13psi at 3800rpms on a regular T4 35r.

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/full-race-turbo-manifold-856090/

Can you give a bit more info on your setup? You say 16lbs by 3800, but what is your max boost when you are achieving that? I might have missed it but do you have a short or long manifold, single or twin wastegate, rerouted to the down pipe or to the atmosphere?

Thanks :)

I did that run just for this thread it was only a 16psi max run I have a aspec short runner street port single wastegate rerouted. I went to the dyno tonight but the clamp for rpms and torque was missing a magnet so no torque or rpm readings. The car feels like it is low on compression a bit. Made 437whp 19psi and 470whp 21psi. No knock at all
i could probably lean it out a bit and advance timing but I want to check compression first. i had it set for 23 on the 19psi runs and 25psi on the 21 psi runs. I am using a blitz sbc-id and i think the gains have to be higher or I need a manual boost controller because it will hit the set boost but is only making the lower boost numbers list above in the upper rpms and the line is up and down on the graph.

Don't you find that a bit hard to buy? Physics is physics. A inducer the same size essentially as a 67mm a larger (10mm) exducer and essentially the same sized turbine wheel? That's a bit more compressor to push for the same sized turbine wheel. Imagine if we took a 35R and made the comp exducer 92mm how laggy that would become. My guess is no, and I'm not saying you're wrong, I'm wondering who is saying that and what the comparisons actually were, ie T3 to T4? T3 to undivided T4? Maybe aero had some effect but even still rotational mass has grown.

~S~

Uncle Harry uses T4, thinks undivided,with 1.06 a/r and usual 3582r
I am going to use T4 divided with 1.00 a/r and hta 3586r billet.
So i will be very close to him if not better regarding spool and whp.
He is also uses very aggressive port. I will try stock port in order to see beter exchausts speed and pressure, more heat because of that of course, but hoppefully better spool.
It will be very close "battle" bewtween these two setups. My opinion is that the tuning part will be the most crucial.
Another factor will be the fuel!!!In Greece we have available 100 octane fuel everywere. I heard, correct me if i am wrong, that is rare in US.

Just an update. That spool up and those power numbers were with only 60psi in the rear housing. I would think spool would be improved and so will power output with a good compression motor. Good thing its winter time.

Well they have a 86 exducer on the 35r and it spools up great on my motor that has bad compression. I don't see any more lag verses a normal 35r.

Nearly there....


FP 3586r, dual Tial mvr 44 wastegates.

http://i368.photobucket.com/albums/o.../enginebay.jpg

You don't need a manual boost controller you need a mapable electronic boost controller and a stronger wastegate spring. A standard 1.06 GT35R is already in turbine section choke on a 13B motor. Bringing more compressor wheel to the equation is not going to do anything good. Most likely you have excessive exhaust manifold pressure at any rpm above 5000 when boost above 15psi.

21psi in your intake, probably 30psi in your exhaust manifold, no wonder your boost controller is having a hard time when the wastegate is unseating by itself.

If your happy with 440rwhp/530BHP buy a 1.06 GT35R if you want more buy a T04Z 1.0. No amount of marketing is going to allow a poorly matched turbo to make the power of a big one with the response of a small one :lol::lol::lol:

Common sense is something rare in these days. Just small searching holds answer. GT35R maxxed out on turbine on stockport engine by 20-21 psi boost. Mated to P-trim turbine and good for maxxing out compressor:icon_tup:

Exactly. I´m not sure if it is in this thread, but claims that T4 flanged T3 housing flows more than regular T3:blush::lol:

I am not lacking common sense. I already had a t3 single 35r setup from the previous owner and the turbo was bad so I figured I would try the 3586 to see if it was any better than a regular 35r rather than swapping my whole setup out. I did plenty of searches and don't disagree with the 35r t3 being choked up top and I'm not arguing that its better than a good t4 setup because its not. I will be switching to a t4 over the fall once I save a little money.

As for the boost controller what do you recommend? I'm using a blitz sbc-I'd and a 1bar spring in a tial 46mm.

I have a large street port not stock ports so me running 23psi is pushing It a bit for now. I usually leave the boost at 20psi anyways. Car is fun to drive but Jobro is right, If you want low 400whp t3 is fine but leaves no room to make more power, I maxed out at 470. T3 35r works hard to make the same power at 20 that a billet 67 makes at 14. My next setup is a precision billet 67.

Did you try raising the gain on the controller first?

Boost controller comparison chart is here https://www.rx7club.com/3rd-generation-specific-1993-2002-16/electronic-boost-controller-comparison-chart-952767/ . The Blitz SBC controllers use an unconventional valve unit. If you really want to switch controllers I'd go with something that uses a 3 port solenoid--basically anything on that list there that isn't Blitz

have the gain at around 30 which is decently high. I was going to raise it a bit as it goes up to .50.

boxer where in ct are you located? would be nice to meet up with fellow single turbo fd owners. only 1 other here in ri that i know of.

So what numbers are the t4 35r 1.06 guys making at 20 psi w/ a bit of water/meth injection? JUst trying to get a comparison to correlate my numbers here soon. It will be a healthy streetport engine. G

You can do a search for the normal t4 35r Dyno numbers here on the forums as there are quite a few with that setup. I would think similar numbers to mine maybe a bit lower and I run meth as well.

Branford which is about hour to RI border.

Thanks. Sounds about right. I made 423 @ 17psi on straight 93 octane for a while. Never had a problem. Going to be bumping up to id 2000's in the rear and aeromotive 340lph. and shoot for 20-21 psi on high boost setting with 50/50 water meth sprayed. Hopefully get the 450 mark. G

What do you have for injectors now? I never came close to high IDC with 550/1680. Then again I run (2) 760cc AI jets at about 80%.

550's and 1600's. Do you think I would be ok since there is some meth. involved (50/50 h20/meth.)? I purchased an aquamist 2D systemw/ an injection amplifier. I was reading where it is better to run a bit higher duty cycles w/ this kit because it sprays according to what it reads from the injector voltage output. I just didnt want to be pushing it too close. It would be nice not to have to spend the extra $$. 450 whp is my goal. G

i made 480whp with 550/1600 injectors on race gas but not too extreme of an afr 11.8. idc was 90% so it was getting up there. you could add in some meth that would help out lower your idc as it is a fuel. 450whp should be fine with 550/1600's though.

boxer we need to setup a meet for some rx7s around the area. maybe meet midway near the casinos or at a track... something. i havent been to a nice rotary meet since 07 in cape cod.