Who here honestly has experience with the HKS GT28 twins on the street at all?

Too bad Guilly isn't around here anymore. He could tell you about it, as he is one of the Supra guys whose car was infamous - around 1000 crank hp on those twins.
http://www.suprastore.com/guil19hkspre.html

I have some experience. What would you like to know?

Streetability?

Check out this link: http://www.to4r.com/special.php?id=1. It's an exhaust shootout, but the car used for the test has 2835s 264 cams and stock internals. More importantly, click on the last dyno sheet and take a look at the dyno comparison. When you remove the car with the 3.76:1 auto ring and pinion, you'll see that the car with the biggest cams, exhaust and intake had the best spool.

All the cars tested were VPC/GCC equipped at the time of their individual dynos. The "Conclusions" section of the write-up places everything in perspective. As with almost everything concerning our cars TUNING and the integrity of your set-up are critical areas necessary extract the best your turbo has to offer. The 2835s are DBB, so that will help as well.

i have had these turbos for almost two years and absolutly love them. I made 788rwhp 688rwtq at 26lbs with a 50 shot, great spool and incredible top end. I am running a full fuel system, hks front mount and stock intertnals, stock cams. i am in the process of putting in a built motor & head with 265/274 cams.

If you buy a car with the twins already on it, no problem. However, they are not the best recommendation if you start a new project with those. They are more expensive than a single turbo kit and have no real advantage over a properly sized single turbo.

And yes, I rode in a 2835 car before. Bill Robards' car actually.

-Olivier

quote:

Originally posted by supraduc:
i have had these turbos for almost two years and absolutly love them. I made 788rwhp 688rwtq at 26lbs with a 50 shot, great spool and incredible top end. I am running a full fuel system, hks front mount and stock intertnals, stock cams. i am in the process of putting in a built motor & head with 265/274 cams.

Great spool with an N20 assist?

nope, boost alone rarely use the n2o 450rwhp by 4500-4700 rpm

So what about its streetability?

OK THEN I WILL SPELL IT OUT they are very streetable they spool early and spin all the way to 35lbs of boost

quote:

Originally posted by boostfiend:
So what about its streetability?

Your questions are very general. Why don't you provide a definition of what you think is "streetable" and, maybe, guys can help you with that. Everybody has a different definition of what is, and isn't, streetable, so tell us what you would like these turbos to do in terms of spool and mid-range and maybe we can help you out.

quote:

Originally posted by Blue Mountain Supra:

quote:

Originally posted by boostfiend:
So what about its streetability?

Your questions are very general. Why don't you provide a definition of what you think is "streetable" and, maybe, guys can help you with that. Everybody has a different definition of what is, and isn't, streetable, so tell us what you would like these turbos to do in terms of spool and mid-range and maybe we can help you out.

Jeez lol... I'd like to know if this is a kit that I can tolerate coming to a stop sign or light constantly, something that spools enough off the line with minimal lag for the street (sans N20), complexity compared to singles, advantages, disadvantages, operability on pump gas because I will almost never be running race gas, what supporting gear I would need, advice from other owners of this kit, caretaking. PRETTY MUCH EVERYTHING! If you know something, please tell me.

1) not the fastest spooling turbos but if your intentions involve 700+rwhp the best of both worlds.
2) much more complex as far as instillation also more to go wrong 2turbos 2 waste gates i run 1.5 bar on pump gas no prob no knock
3) you will need a fuel system, 850min injectors, big front mount, full exaust, aem ecu, and a wide band o2 sensor.
4) i dont feel that this system requires any more matinence than a single

quote:

Originally posted by boostfiend:

quote:

Originally posted by Blue Mountain Supra:

quote:

Originally posted by boostfiend:
So what about its streetability?

Your questions are very general. Why don't you provide a definition of what you think is "streetable" and, maybe, guys can help you with that. Everybody has a different definition of what is, and isn't, streetable, so tell us what you would like these turbos to do in terms of spool and mid-range and maybe we can help you out.

Jeez lol... I'd like to know if this is a kit that I can tolerate coming to a stop sign or light constantly, something that spools enough off the line with minimal lag for the street (sans N20), complexity compared to singles, advantages, disadvantages, operability on pump gas because I will almost never be running race gas, what supporting gear I would need, advice from other owners of this kit, caretaking. PRETTY MUCH EVERYTHING! If you know something, please tell me.

I'd say don't waste your time and money on these turbos, or any turbos for that matter capable of making 700+ wheel, if you will not be running race gas, this coming from a guy who has never had anything other than twins in his MKIV (I'm on my third big-twin upgrade). You live in Cali like I do and, if all you plan to do is use that 91-octane water in your car, I don't see the point of spending thousands for this kit only to cheap out on fuel and never be able to realize all this set-up has to give (with the right tune).

No offense intended, but it sounds like you need to conduct quite a bit of research about turbocharging in general before deciding in advance on what type of set-up you desire. I suggest purchasing Hugh MacInness' book entitled "Turbchargers" to gain a better understanding of how these things work. HKS twin kits are quite rare and VERY FEW Supra owners have direct experience with them, so I would question the advice you might receive on this or any other forum regarding this set-up from those that do not have direct experience. Your response to my earlier comments indicates, to me at least, that you need to make the effort to find out more about "how things work". Again, no offense intended, but the more specific and technical your inquiries, the better the responses will be.

if you want like that kind of power go with a SP74GTQ or Ho thats what adroctt used to run on his and its a verry driveable car and twins are to complicated

I don't need all that power. I was merely curious. I'm interested in the SP67GT-HO.

quote:

I'd say don't waste your time and money on these turbos, or any turbos for that matter capable of making 700+ wheel, if you will not be running race gas, this coming from a guy who has never had anything other than twins in his MKIV (I'm on my third big-twin upgrade). You live in Cali like I do and, if all you plan to do is use that 91-octane water in your car, I don't see the point of spending thousands for this kit only to cheap out on fuel and never be able to realize all this set-up has to give (with the right tune).

could always use a water/meth kit...