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R34 Gt-T Mods And The Future..

macca911

By macca911,
in Engines & Forced Induction

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macca911 Enthusiast

macca911

Posted
Posted

Hey all,

I have a 2001 R34 GT-T that I recently modified with the following..

• HKS GT-RS
• Z32 AFM
• Deatchwerks 600cc Injec.
• APEXI Power FC
• Apexi panel Filter
• Bosch040 Fuel Pump
• Blitz SE Intercooler
• Splitfire Coil Packs
• Exedy sports Clutch
• HKS EVC 6 Boost Controller
• NGK Plat. Plugs
The help I'm chasing is where to go from here? I made 250rwkw on pump 98, however I was hoping for a little more. I've been researching thoroughly however I'm currently at a bit of a loss.
The car is extremely responsive and that's what I was going for when planning these upgrades, I don't want to lose that..
I'm looking into type B pon cams, and it's my understanding, with the turbo selection I'm right on the boarder of type A vs type B..
Also looking into e85, however I know this will require fuel system upgrades..
Can anyone recommend anything else I'm missing?
I've seen a few 33gts-t's on this forum supposedly making 300kw with this turbo and was hoping to get closer to that..
Any suggestions are welcome,
Cheers.
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https://www.sau.com.au/forums/topic/439882-r34-gt-t-mods-and-the-future/
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GTSBoy Grand Master

GTSBoy

Posted
Posted

The GT-RS is a good street turbo. Gives great response but chokes the engine up top. Remember that dynos vary, so 250 on yours might be closer to 270 on another, and 270 on that one might be closer to 300 on another. So you can't compare unless you can do a backup check like same dyno same day or trap speeds.

If you want more power you really need to look elsewhere. Some of the HG highflows or new turbos would probably suit and then there are a handful of other options that make sense at varying budgets (such as HTAs or their replacements).

E85 will certainly get you another 30 rwkW or so, possibly more. Also help with the GT-RS being a bit of a hot gas restrictor for the engine too.

GTScotT Grand Master

GTScotT

Posted
Posted

Cams will probably fall short on bang for buck, but E85 will net you a tiny bit more.

The thing is that 250kw is fairly close to the turbos outright flow potential on the turbine side. So going E85 MIGHT result in 20-30kw but most likely not more than that.

Be it myself I would accept that the setup is performing really well as it is and just enjoy it. The $$ outlay on going flex fuel wouldn't be worth the power gains and the hassle of running to E85 pumps just doesn't do it for me.

Bass Junky Grand Master

Bass Junky

Posted
Posted

Cams wont do any good if the turbo is running out of puff. Many many moons ago I had a GCG highflow with 260 degree Poncams and the damn thing made 250 rwkw from about 6500 to 8000 rpm, so they helped fatten the top end.

But the turbo wouldn't flow any more than it would flow.

Bigger turbo for more power my friend.

Blackkers Experienced

Blackkers

Posted
Posted

it depends if you want to put up with travelling to buy e85 and if it's easy to obtain in your area basically. What boost level are you running? i'm willing to bet you can run a few more pounds on e85 to help chase power.

with the bigger top end it will be like having a bigger turbo without the added lag. it just comes down to how much of a hassle it is for you to run the fuel. If you already have all the other mods, then just a fuel pump and bigger injectors and a tune will get you there.

i went e85 a while ago and its awesome

wolverine Grand Master

wolverine

Posted
Posted

250rwkw = good result on 98 ron

E85 won't need a total fuel system upgrade just a decent E85 safe fuel pump would be all I would do.

300rwkw was done on one of the dynos in Adelaide from memory......but I have a feeling it would make 250rwkw on the same dyno you used.

macca911 Enthusiast

macca911

Posted
  • Author
Posted

Thanks everyone,

I'm running 20pound quite comfortably, we had it up to about 23 but the knock levels were through the roof..

@wolverine, yea not an entire fuel system but I can imagine the 600cc injectors wouldn't be sufficient.. Fuel pump either for that matter.

I'm in the middle of moving to Brisbane and not too sure what E85 is available up that way but it shouldn't be too hard to find out..

30kw extra is nothing to sneeze at, if the fuel is readily available then why not..

Cheers for the responses!

Cowboy1600 Grand Master

Cowboy1600

Posted
Posted

Time for a new turbo if you're after more power.

Can't go past the hypergear line up for RBs.

I'm not sure what E85 availability is like in Brisbane. If it's a bit suspect, perhaps WMI might be a better option?

Cowboy1600 Grand Master

Cowboy1600

Posted
Posted

From what I understand 250rwkw from a GTRS is a healthy result - the OP cant expect much more. He might gain 20 odd kw with ethanol, but that's a $1000+ investment for a relatively small gain. Bang for buck I doubt he can do better than a bigger turbo at this stage (which is $2k+ but would net much bigger gains and provide much bigger overheads if he does go E85 or WMI later). If he's hell bent on keeping the GTRS, then perhaps WMI might be an option instead of E85, as he's identified a concern regarding E85 supply.

I was merely giving a couple of options. I don't see why you're so confused.

Ben C34 Grand Master

Ben C34

Posted
Posted

I'm not confused. Now that you have explained it more it makes more sense. Your initial post said if he wants more power he needs a bigger turbo, which as yiu agree isnt the case. Its just a case of value for money and time at this point.

scotty nm35 Grand Master

scotty nm35

Posted
Posted

I made 250kw on my old Sierra s1 highflow, and over 300 swapping to ethanol. There should be another 40-50kw in the GTRS if the tune is pushed, and with the amount of second hand injectors floating about he could probably convert for bugger all.

Saying that, I sell Walbro 255's for $100, or VDO pumps are even cheaper at around $70. Both should get there flow wise. You can get Siemens injectors pretty cheap these days... The main cost is in the tune, but that is inevitable when chasing power.

A larger turbo is not going to feel as good on the street and is going to cost heaps more.

Blackkers Experienced

Blackkers

Posted
Posted

600 CC would probably be a bit small to keep decent AFR's on your set up. I've got 1000cc and use 80% duty at 306kw 20psi on a HG highflow. that was with wheelspin from 5k+ RPM so we don't really know how much power is being made. anyway I think they are probably similarly sized turbos and 600CC injectors might only get you there with an adjustable FPR and a very good fuel pump

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

600 CC would probably be a bit small to keep decent AFR's on your set up. I've got 1000cc and use 80% duty at 306kw 20psi on a HG highflow. that was with wheelspin from 5k+ RPM so we don't really know how much power is being made. anyway I think they are probably similarly sized turbos and 600CC injectors might only get you there with an adjustable FPR and a very good fuel pump

!! I make 314AWKW with 550 Deatschwerks injectors. 600s will be fine.
Cowboy1600 Grand Master

Cowboy1600

Posted
Posted

!! I make 314AWKW with 550 Deatschwerks injectors. 600s will be fine.

On E85? 600s will be hard up against it. From what I've read here you need 20-30% more flow when running E85.

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