2835 Vs Gtrs For Street

[nsta]

As topic, which would you prefer, im aiminf for 250rwkw max, and a mid-low 12sec daily driven car?, is this possible, and response is the key for me, the more the better.

[paulr33]

highflow would give better response and cheaper

but if i was to choose between 2835 and gt-rs i would choose 2835 pro-s as you can choose the a/r size whereas gt-rs is fixed

i also think the gate setup on the 2835 pro s is a bit better

[Dale FZ1]

Compressor spec differences between those two particular units is not huge. 56 trim vs 52 trim impeller gives the Pro S a little more pumping capacity and perhaps another 30 crank hp if you want it at maximum flow. At that stage the higher flowing turbine (and wastegate design) in the Pro S probably allows another 15-20 hp to be developed as well. Figure on a maximum difference of around 25rwkW between the two designs, but I'll stick my neck out and run with the GT-RS as being noticeably quicker responding to a transient throttle, regardless of which A/R turbine housing is mated to the Pro S.

Slightly off-track from the original question, but as for whether a GT-RS will be less boost-responsive than any of the more commonly used high flows, I would doubt it. The Garrett based cores use essentially the same rotating assembly and may flow slightly less than the HKS housing combos, but they will (should) accelerate into and through the boost range at a similar rate. Exact specs of GCG style and Slide high flows are not known, but there is little complaint about their overall performance.

Bottom line: GT-RS for street use and around 250kW is probably the best unit, but at a price. High flows are probably just a short distance behind performance wise, but a long way in front price wise. If you wanted more than 250, then the Pro-S is a viable alternative - but given the small increase in power capabilities you would have to consider the GT30 based units (eg. 3076R) which are capable of supporting even higher power for the $$ being spent.

Very standard advice is to carefully consider the application and your own maximum power ceiling + transient response requirements + budget and then make a choice.

Edited May 1, 2007 by Dale FZ1

[discopotato03]

Yep lots of controversy over turbines/housings and those 71mm GT35 compressor wheels .

Cost and complexity are very much a factor as well as performance (potential) numbers . A GT-RS (HKS housing GT2871R 52T turbo) is more compact/cheaper/simpler to fit than their Pro S turbos . Where the smaller dryer' pays off is that it works closer to the sorts of engine revs/loads used much of the time . I think you get better value for money from your mods when you can use them most often , 250 kw ? its a number based on torque and maximum revs . Your respective calls but I think its torque numbers you ought to be chasing because if you can get it without big revs great , then pull another gear because thats what the box is there for .

As far as the GT-RS is concerned its based on the HKS custom T3 flanged GT28 .64A/R integral wastegate turbine housing . If you can beg/borrow/etc one of these housings ANY GT28 BB based turbo with that turbine can be bolted up eg 2530 GT28RS GT2535 GT-RS GT2871R's .

Cheers .

[nsta]

Yep lots of controversy over turbines/housings and those 71mm GT35 compressor wheels .

Cost and complexity are very much a factor as well as performance (potential) numbers . A GT-RS (HKS housing GT2871R 52T turbo) is more compact/cheaper/simpler to fit than their Pro S turbos . Where the smaller dryer' pays off is that it works closer to the sorts of engine revs/loads used much of the time . I think you get better value for money from your mods when you can use them most often , 250 kw ? its a number based on torque and maximum revs . Your respective calls but I think its torque numbers you ought to be chasing because if you can get it without big revs great , then pull another gear because thats what the box is there for .

As far as the GT-RS is concerned its based on the HKS custom T3 flanged GT28 .64A/R integral wastegate turbine housing . If you can beg/borrow/etc one of these housings ANY GT28 BB based turbo with that turbine can be bolted up eg 2530 GT28RS GT2535 GT-RS GT2871R's .

Cheers .

Basically how could i make a street weapon r33 gtst with a hks gt-rs?what supporting mods will i need, and will i be maxing out the turbo to reach the goal?

ive currently got:

3inch exhaust plus split dump pipe

hybrid front mount intercooler

apexi pod filter

running 10psi

9.5" rims all round with 235f and 265r, toyo t1r tyres

lot of suspension work done, coilovers, camber arms etc...

now heres the plan:

hks gt-rs kit

bosch 040 fuel pump

nismo 550cc, or 700cc injectors(havent made up mind, but the 700cc are nearly the same price)

power fc (dnno if ill need the hand commander?)

will this be enough or will i need to do more?, and im keeping my auto, but putting in a shift kit, and electronic controller so the changes will be manual using a b&m shifter.

[lukits01]

Just as a reference

My auto with 244rwKw with HKS 2535 on Mickey Thompsons was hitting 12.5

Considering the GT-RS is the bigger replacement for the 2535, it will not have a problem hitting your target

supporting mods

Nismo fuel pump, 450cc injectors, Wolf3D, and MV Automatic Shift Kit

for 1/4 mile leave it on auto, not sure about the BM shifter though

[Kaido_RR]

HKS GT2835 PRO S

251kw @ 16psi (with shitty tune) - 13flat with a 112mph (good enough for a mid 12 if i could get if off the line)

buy the kit bolt it on, get and tune and your away (kit is very easy to install comes with everything you need, braided lines, dump pipe, intake pipe)

full boost under 3300rpm, and very very streetable

[Blitz]

The GT-RS on an RB25 is awesome.

I have been in a couple of R33 GTS-T's running them and their performance and response has been outstanding.

[nsta]

Thanks, so theres no need to get the larger 700cc injectors at the same cost as 550cc(is it too overkill?), im getting the mv shift kit.

[Taso84]

highflow would give better response and cheaper

but if i was to choose between 2835 and gt-rs i would choose 2835 pro-s as you can choose the a/r size whereas gt-rs is fixed

i also think the gate setup on the 2835 pro s is a bit better

and what a/r would u recommend for his application?

[R33silverS2]

High flows are probably just a short distance behind performance wise, but a long way in front price wise.

Isn't the price only about $200 or so? Nengun has the rb25 gt rs full kit for around $2100, and gcg rb highflows are around $1900...

Or is it the installation that makes the price difference? i.e highflow direct bolt on unit etc...

[croat]

gtrs on a rb25 is a very good setup. i had it before and could not fault it. it was a strong and reliable 250rwkw -260rwkw on around 17-18 psi. you will need your exhaust, intercooler, fuel pump, and 555cc injectors. the rest will bolt up with the kit.

[SimonR32]

Isn't the price only about $200 or so? Nengun has the rb25 gt rs full kit for around $2100, and gcg rb highflows are around $1900...

Or is it the installation that makes the price difference? i.e highflow direct bolt on unit etc...

no they are the same, just some turbos are overrated!

[Taso84]

which 1 is overated?

[Dale FZ1]

Frankly, I don't believe either is over-rated. They both work well. As does a GT2871 Garrett cartridge into OE housings.

They may share similar max power capabilities but I'd say their characteristics in operation would be slightly different. The HKS GT-RS should be slightly more progressive and easier to drive in its delivery. Whether the average driver would notice or care is a moot point.

The extra cost in the HKS kit comes in the lines, fittings, shields etc that make it a complete kit.

The main attraction of a GCG style unit is true bolt-on / bolt-off re-using all oil and water connections, no obvious change from stock appearance.

And the difference is around $400. Just a matter of determining your priorities and lay down the $$.

But back to the original question posed, and my opinion GT-RS is still a small step ahead for street use and internally stock engines compared to the 2835 Pro-S for virtually the same price.

Edited August 13, 2007 by Dale FZ1

[The Mafia]

I run a GT3037 56 trim and 0.63 rear.

Car made 300rwkw with 18psi of boost, and the torque curve was the best I have seen. Hit 700nm at 3,000rpm and stayed like that to the limiter.

I had water methanol injection though.

I'd be looking at a GT3037 with a 52 trim and a 0.63 rear. That should land you 250rwkw easily, and maybe with a little more when you need it. (oh, and you will, trust me)

[Fujiwara]

I run a GT3037 56 trim and 0.63 rear.

Car made 300rwkw with 18psi of boost, and the torque curve was the best I have seen. Hit 700nm at 3,000rpm and stayed like that to the limiter.

Was this on standard internals?

And back to the original question.

I am tossing between these 2 turbos but leaning more towards the 2835 proS as it gives me room to achieve more power when i get some work done on the engine.

[joeyjoejoejuniorshabadoo]

Unless you're going internals then any more than a gtrs will be pointless imo

[R33silverS2]

with a price difference of a few hundred bucks in the scheme of things i really dont think it should be an issue to someone doing and upgrade for the 250+kw range. The amount of money you have to spend doing with either option with all the supporting mods, ecu, injectors, pump, fpr -if required, z32 , clutch etc makes the $300 or so quite a small figure. I'm going to go the hks route as i fugure if i am spending all that money what is a few extra hundred bucks, and you get a brand new HKS turbo with brand new braided lines and new fittings etc. Not to mention the testing that would go into the HKS unit. That said, I am sure the gcg units are equally as capable - I just think if you r gonna spend 5k getting to 250kw from 200 the extra price isn't really an issue.

[joeyjoejoejuniorshabadoo]

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