Jump to content
SAU Community

Single (t51r) Vs Twins (t517z)

GTR 94

By GTR 94,
in Engines & Forced Induction

 Share

Recommended Posts

GTR 94 Mentor

GTR 94

Posted
  • Author
Posted
I think what people are trying to say is that: You sacrificed sooooo much response and usable power for so little power gains.

It just doesn't sound right. You mentioned you have a 1100hp set-up, so why is it only making 500hp?

I know an rb25 with a to4z making 360rwkw on pump fuel at 20spi

or

an rb30et with a 1000hp turbo making 420rwkw at 22psi, on pump fuel.

I do understand that these turbos really wake up at about 30+psi, especially when using C16, but your figures really sound low.

My question is; which set-up do you really prefer to drive?

*edit: Damn Daz just got in b4 me ;)*

ok you are correct the power gains so far are minimal but, the car has plenty still to go. all i was trying to show was what i think is one extreme to the other, seeing as i have been there and done it that is all. not trying to put wind up anyone or prove any points just one against the other.

Hey Lee,

I definetly had the 8cm version and most power i made with the t517z turbos was 365rwkws...

Seeing your car at the show and shine with the BFT (big fu(koff turbo) i thought this car has come along way since i last saw it...

At the end of the day it something you had to try and its not the end of the world, if your not happy with the lag swap it for a smaller turbo and you should still have the same peak power but shitloads more midrange...

And remember dynos are tuning tools..... all dynos are different....

Cheers,

Jack

hey Jack cheers for clearing that up. yeah was good to see you at the show and shine would have been good to have a good chat, but mate needed to be home so had to leave early. hopefully i can get to a few more events and meetings now and do more club activities.

i know that i always have the opportunity to go back to a smaller setup but like you said i had to try it and i did, but i am also not saying i am not happy with the lag it is a totally different feeling to the twins.

And couldnt agree more "dynos are tuning tools..... all dynos are different...."

cheers mate

you can actually get T51R's to make power earlier...but it takes a fair bit of experience and r & d. Ive seen what we thought the was perfect set-up (made 500AWKW at 25psi on 98 pump fuel) come alive 1000rpm earlier and made another 50AWKW with a different approach to the port work and camshaft change.

ok i understand. maybe you could send me a dyno sheet showing this, i do believe you, its just to be honest i haven't really been able to find any dyno sheets for 2.6lt SPL's around anywhere to compare with. as ive also said it is still tuned very rich so deffinatley with more tuning ill be hoping to see better results.

cheers

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • joshuaho96
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By joshuaho96 · Posted

      I mean the other day I had to walk someone through diagnosing why their timing belt was walking off the cam gears. At least one of the issues was a bent tensioner stud. Local mechanics have found runout on the CAS mechanism causing weird failures. I'm also no saint here I've documented some of the things I've had to learn the hard way. Something I discovered recently is that my CA emissions catalytic converters weren't even welded correctly to align the downpipe to the main cat and they tossed the support bracket that goes from the transfer case to the downpipe to support everything there. I spend a lot of time chasing down these decidedly unsexy problems and the net effect is it feels like I never actually get to the original objective (flex fuel, VCAM, oil control, cooling, etc).
    • r32-25t
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By r32-25t · Posted

      At times with how you make everything sound, all I imagine Americans doing when they see a gtr is standing there looking at it and bashing it with a gun like how a caveman would with a club and hoping it fixes itself 
    • joshuaho96
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By joshuaho96 · Posted

      I think this is just a product of how the US market works for this stuff. Shops are expensive and there's no real way of knowing what kind of results you're going to get, people don't really have the institutional knowledge. I have heard too much at this point to really put faith in anybody "full service" except maybe DSport and they aren't really a full service kind of shop. If you go to the right place I have no doubt they'll get it right for you. Some locals have set it up right but the cost really is nuts and even now they're still fighting issues. And you know I'm a crazy person who thinks things like twin scroll, relatively short low-mount cast headers, PCV recirc to intake, recirculating BOV, right-sized for ~400 whp, MAF load, validating all of that to a standard comparable to OEM test programs, etc are relevant. For what it's worth, multiple local owners at this point have been stuck in a perpetual cycle of blowing a motor -> getting someone to rebuild it -> some missed detail causes the bearings to wipe and spin just outside of break-in mileage or drop valves or some other catastrophe -> cycle repeats. I usually only find out about this because I'm perpetually helping random friends with diagnosing car troubles, Skyline or otherwise. The single turbo stuff if I'm honest is mostly secondary, it just doesn't seem to achieve the numbers in the ~2000-3000 rpm region that I would expect given the results I've seen here or in Motive's videos. I don't really know what we're missing here in the US to be causing this. Lots of people like to emphasize the necessity of finishing the project first and foremost, but I'm not made of money and I can't afford to be trashing a 15k+ USD engine build with any regularity. Or spending my relatively limited garage time these days unable to triangulate problems because too much was changed all at once. Also, even if it isn't a catastrophic failure I would consider spending the cost of single turbo conversion with nothing to show for it to be pretty bad. 
    • V35_Paul
      So whats the deal with the porous block VR30DDTT

      By V35_Paul · Posted

      The water pump is know to leak as well. So if the coolant is low checking that first as well as hoses. 
    • Murray_Calavera
      HKS stroker kit step 0/1 or HKS GTIII 2530

      By Murray_Calavera · Posted

      Reading your posts Josh, sometimes I feel like I've gone in a time machine back to the 90's when everyone was doe-eyed and figuring things out for the first time.  I've lost track of how many single turbo GTR's I've seen on track that haven't burnt down lol. Everything has been figured out a long time ago. These things are at the point now where its essentially turn-key to go single turbo. 
×
×
  • Create New...