Forced Performance Hta Turbos

[GTScotT]

The difference between a 3076 .63 and a 3582 .82 will be massive, that is a definite..

From memory there was a source somewhere which showed some HTA back to backs on an Audi (IIRC?), which may even be in this thread if you have a good read... On WOT pulls the HTA3582 was not far off the garden variety 3076.

What you need to consider before taking those results as gospel are as follows:

- WOT pulls on the dyno are not a true indication of what will be felt when commuting with the car. While full boost might be at a similar place, the 35R will definitely be MUCH doughier in the traffic.. Regardless of how stellar the HTA technology is, as a 35R rear wheel is simply a lot more turbine.

- Your car currently sports a .63 turbine housing, which is arguably undersized for your application. As a result your setup would likely feel a little more enthusiastically potent than what a comparable .82 setup would feel, and so just going to a .82 will already take away some of that poke. Going up in turbo size will do more again.

It sounds like the car is reasonably well set up but mostly does a lot of commuting, so I am a little gun shy to say "yeah sure, whack a HTA3582, it will be awesome". As much as I do believe it will rock socks, I think the majority of the time you are commuting you will miss the current setup. On the street you probably wont notice the jump in power nearly as much as you will notice the jump in lag.. This is honesty coming through.

If an increase in power is sought there is an alternative you may want to consider. Hypergear has a variable geometry housing he is playing with at the moment that could be adapted to most turbos. Essentially when not on target boost the housing will be small (around .50ar) and when target boost is achieved it will open to be the full size (.82). You could probably use one of these housings with the existing 3076 to "have it both ways" as you noted, or you could still pursue the HTA3582 path and potentially have something stellar.

I'm sure that will give you something to think about. Have a good read of this thread and also the Hypergear thread, page 1 will have an index of what page topics start on.

Good luck.

[34GeeTeeTee]

Going from the GT3076 to the HTA3076 was the best thing I have done to the car and the change is not really shown by the numbers...

I have not been posting updates but instead enjoying the car finally, it's so much faster but so much better in general too...

I would recommend the HTA without hesitation.

[r34unit]

Going from the GT3076 to the HTA3076 was the best thing I have done to the car and the change is not really shown by the numbers...

I have not been posting updates but instead enjoying the car finally, it's so much faster but so much better in general too...

I would recommend the HTA without hesitation.

Is it a big difference in down low response or up high pull ?

If so when do you come on boost ?

[34GeeTeeTee]

Is it a big difference in down low response or up high pull ?

If so when do you come on boost ?

It's a major difference but mainly noticed down low, the HTA feels like a smaller turbo... You have boost the moment you squeeze the throttle unlike the GT that needed time to build.

It's hard to show or explain, but from driving both turbos I would not hesitate to choose the HTA over the GT anyday...

Of course it's more aggressive with the extra power and torque but I am yet to get that power to the ground, the biggest thing I am impressed with is the power/boost down low...

[GTScotT]

Great feedback. Glad you added, Matt.

BTW I would be keen to pilot at the drags some time if you would allow I would love to see what I can do with 400kw lol

[methz]

hopefully 11s at 135mph hehe

[sky30]

Since your boost drops from 20 psi to 16, you may benefit from going the hta3076, and i would think it would then hold 20psi to redline. Mine was boost dropping same as yours before i switched to hta.

And whack a .82 rear on the hta and it should be similar or better in spool than your current setup, and make a heap more power

Edited August 12, 2013 by sky30

[34GeeTeeTee]

Great feedback. Glad you added, Matt.

BTW I would be keen to pilot at the drags some time if you would allow I would love to see what I can do with 400kw lol

It'll get down the drags one day but for the next few months it will do daily duties and preperation for the SAU NSW SMSP South Day and the SAU NATIONALS.... Once i have done them ill get some decent rubber and see if i can run in a straight line

hopefully 11s at 135mph hehe

Lol 11's maybe, but 135mph

Since tour boost drops from 20 psi to 16, you may benefit from going the hta3076, and i would think it would then hold 20psi to redline. Mine was boost dropping same as yours before i switched to hta.

And whack a .82 rear on the hta and it should be similar or better in spool than your current setup, and make a heap more power

I would think so!

[GTScotT]

It'll get down the drags one day but for the next few months it will do daily duties and preperation for the SAU NSW SMSP South Day and the SAU NATIONALS.... Once i have done them ill get some decent rubber and see if i can run in a straight line

lol sounds like a plan I'm no straight line guy but I find the drags to be some very hassle free fun. Give it a go when you get a chance, there is definitely a skill to be mastered and its good fun.

Since your boost drops from 20 psi to 16, you may benefit from going the hta3076, and i would think it would then hold 20psi to redline. Mine was boost dropping same as yours before i switched to hta.

And whack a .82 rear on the hta and it should be similar or better in spool than your current setup, and make a heap more power

I can't agree that telling the guy that swapping out to a HTA will fix his boost control issue... While that might work there would be much cheaper methods available to him which WILL result in a decent increase in power alone.

It should be noted that the potential cause of the boost drop might NOT be the turbo or even the housing size but potentially his gate position.. SO it would be worth his time in investigating that issue before he forks on a mega turbo. It would be very annoying to put le mega turbo on the car and still have that sort of drop... For comparably dampened results.

OP why not try look at your gate position and size first, and the size of your rear housing, before dropping a lot of coin on the new turbo? I am confident that a fixing the boost control issue alone will net a reasonable gain and might make you pretty happy for the bang for $$ ratio.

[34GeeTeeTee]

I tried a couple of standing starts on the weekend... I was useless, so no doubt there is skill involved! Keen to learn, just time and money are a factor as always... The car will be with me for a very long time as I love it so it WILL happen eventually

[Joshbigt62r]

Matt they are a fantastic fun car. As good as GTR's are with there 4wd atessa system you just can't beat that gts-t/gtt rwd step out fun in my opinion. Especially a HTA 3076 equipped gtt must be awesome. I reckon with some good tires and some seat time you'll easy see a 11.5 atleast.

I'm still saving for my turbo kit. but I'm not doing it half assed there for the reason I'm saving, doing it once and doing it right.

Josh.

[34GeeTeeTee]

Matt they are a fantastic fun car. As good as GTR's are with there 4wd atessa system you just can't beat that gts-t/gtt rwd step out fun in my opinion. Especially a HTA 3076 equipped gtt must be awesome. I reckon with some good tires and some seat time you'll easy see a 11.5 atleast.

I'm still saving for my turbo kit. but I'm not doing it half assed there for the reason I'm saving, doing it once and doing it right.

Josh.

This is why it took me 5yrs to get it from the high flow, to the 3037 and finally where its perfect for what i want with the HTA3076... Its been a long road but the car is just everything i wanted from it, i havent had much seat time and have not got the power down to the ground and already i am amazed what it can do, i think over the coming months it is going to really start showing what it can do!

I had the option to buy a GTR at the time of purchase but felt i could have more fun as an all rounder in the GTT, funnily enough 5 years ago they werent that common! Now they are everywhere and cheap. They were also very expensive to modify early on as there wasnt a huge aftermarket support, nowadays there are parts galore!

I smile everytime i drive the car whether its on low boost, plumb back or just off boost! Its just a damn good combo!

[sky30]

I tried wastegates, exhaust, intercooler pressure drop, signal hoses. And couldnt fix my boost drop, turns out the compressor was out of flow and as soon as i put the hta it solved this.

he is looking to upgrade to a hta , and im just saying its a good idea coz it will probably fix the boost issue.

Sounds like ur dead against hta, may be try one and see why people hype about them, theres good reasons for it.

[34GeeTeeTee]

I tried wastegates, exhaust, intercooler pressure drop, signal hoses. And couldnt fix my boost drop, turns out the compressor was out of flow and as soon as i put the hta it solved this.

he is looking to upgrade to a hta , and im just saying its a good idea coz it will probably fix the boost issue.

Sounds like ur dead against hta, may be try one and see why people hype about them, theres good reasons for it.

In saying that, i maxed the 3037 and had it running 24psi down to 21ish..... The HTA did the same thing just on a higher scale due to a bit more flow so it was say 28psi to 24psi..... The dyno sheet shows this increase in boost as an increase in power and torque which of course makes sense, what it doesnt show is how the car behaves totally different on the street! So i agree with what you are saying IF the turbo is at its limit, but also think its a good idea for the OP to diagnose to be sure before handing over a wad of cash!

I HTA all the way and think they are the best combo for an RB, i dont care what else is available nor do i care what people think, i know my car and i have never smiled so much driving it

[Lithium]

I tried wastegates, exhaust, intercooler pressure drop, signal hoses. And couldnt fix my boost drop, turns out the compressor was out of flow and as soon as i put the hta it solved this.

he is looking to upgrade to a hta , and im just saying its a good idea coz it will probably fix the boost issue.

Sounds like ur dead against hta, may be try one and see why people hype about them, theres good reasons for it.

In this case however we know that a normal GT3076R can supply up around 20psi in the high rpm on a fairly mild RB25DET without too much issue, so falling to 16psi up high suggests another issue which changing the turbo won't guarantee fixing.

On the flipside, if extra power without extra lag is an end target then going from a .63 GT3076R to a .82 HTA GT3076R sounds like quite a step up - a MASSIVE improvement in power potential and the odds are a nicer overall drive to be had, going from 34GeeTeeTee's results.

Whether it is worth the money spent can really be a case of "in the eye of the beholder". Depends on how much power he wants, or how happy he is with what he has now.

[GTScotT]

I am far from being against the HTA, I simply read into what people say they are after and I consider the best and most cost effective way to achieve that.

We have been told the car is mostly a commuter vehicle and has the odd spirited punt, which tells me a large outlay is probably unwarranted. The OP has mentioned he wants more power without picking up too much lag, and in my own mind I have identified a couple of issues worth considering before making the change.

Consider this: If the OP was to fix his boost control issue and have it hold 20psi flat, he would likely get a 20kw gain which would easily be felt seat of the pants. This MAY put a big enough smile on his dial to continue on with the current setup and enjoy it a while longer. Likewise with the exhaust housing. Once OP decides the fixes to these issues were NOT enough of an improvement for him he can then buy himself a HTA knowing he no longer has a boost control issue, and he has only lost the cost of a touch up tune to get it to hold 20psi flat.

I think Lith's post sums it up pretty well, too.

[sky30]

I would agree its up to the op to decide if its worth spending the cash. My opinoion is same as 34 geetees, well worth the upgrade not just for power increase, but beter boost response, its realy amazing i went to a 4mm larger compressor, but boost response improved a heap, must be very well designed.

Edited August 13, 2013 by sky30

[34GeeTeeTee]

I would agree its up to the op to decide if its worth spending the cash. My opinoion is same as 34 geetees, well worth the upgrade not just for power increase, but beter boost response, its realy amazing i went to a 4mm larger compressor, but boost response improved a heap, must be very well designed.

I was sort of worried when i first made the purchase of the HTA as it was pretty spontanious but good ole Lithium kept me confident with the facts while waiting for the tune, everything was spot on once it was complete and the initial drive was just awesome! Big thumbs up to Forced Performance for what they have done, they have really taken a proven performer and just kicked it that bit further! Oh and big thumbs up to Lithium for keeping me motivated all the way through

Actually, where is Bri73y with updates and feedback?

[Lithium]

I was sort of worried when i first made the purchase of the HTA as it was pretty spontanious but good ole Lithium kept me confident with the facts while waiting for the tune, everything was spot on once it was complete and the initial drive was just awesome! Big thumbs up to Forced Performance for what they have done, they have really taken a proven performer and just kicked it that bit further! Oh and big thumbs up to Lithium for keeping me motivated all the way through

All good man, glad the punt paid off! Being the first can have it's pros and cons - but everything was there in theory for it to be a good result, and it speaks for itself in regards to how well these Garrett/FP units work. It's a shame there is such stigma about "these work on xxx but won't work on yyy" - while a turbo may work better on one motor than another (depending on flow, pressure ratio etc match-up) when you have the kind of results etc that are already available for the HTAs its a pretty safe bet that a lot of their units are perfect for RBs

Actually, where is Bri73y with updates and feedback?

This. Trying not to nag him, but been gagging to hear how it goes when the car is behaving and he gets to loosen it's leash I am pretty sure he's due to have taken it out for some racing by now

[AngryRB]

I find it a bit confusing when people say that the dyno is different to how it behaves on the street, my experience with the GTX was that it was very similar to its dyno graph, I havnt had the TS GT3076 on a dyno yet but so far the STREET feel is not night and day compared with the GTX, so the change from GTX to GT compressor doesn't seem to back up what was said about response in my case... seems to me that all these turbo's have the same size hot side, a 60mm turbine that can only speed up so fast and the motor itself doesn't seem to be able to ingest and flow the gas quick enough when the revs are under 4000rpm, maybe other peoples setups are making the difference... In future id be trying the Hypergear route..

Edited August 13, 2013 by AngryRB