Jump to content
SAU Community

Gtr Joey's R32 Gtr E-Flex, Twinscroll 83/75 Results

GTR_JOEY

By GTR_JOEY,
in Engines & Forced Induction

 Share

Recommended Posts

  • Replies 300
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

GTR_JOEY
GTR_JOEY

Engine in!!!

GTR_JOEY
GTR_JOEY

Small present from the mrs

XKLABA
XKLABA

Lol, as if, I would much prefer to be doing it with twins then a big single

Posted Images

HarrisRacing Proficient

HarrisRacing

Posted
Posted (edited)

Don't know how I missed this thread before, but I'm glad it got bumped...it's been a great read.

Right now I'm in deep contemplation of single turbo for my 2.75L stroker (if you want to call it that).

I took the liberty of finding some dynos from both Joey and Simon's cars early on at lower boost levels. Albeit both on E85, they are both still at around 20 psi. Joey stated that his 8375 was pretty much out of breath on top and I used the dyno that is missing the 24psi midrange in this comparison (for fairness). I assumed his was standard cast wheel and I also found that his was the .91 housing and I saw where Geoff at full race recommended 1.00 for more power. For the money, I just don't think this turbo can be beat for a nice powerband and while Simon has made STUPID big numbers I think on a 2.6L and for $600 US, this is looking like a strong candidate for a pumpgas turbo. Of course I am not taking the EFR 8374 ($$$$$$$) into comparison yet.

Anyway hope this helps put things into perspective for others looking for information. If anyone finds a dyno of a low boost stroker build with the 8375 (cast) or 6266, let me know...I'd love to add them.

Patrick

post-136202-0-51390000-1428798994_thumb.png

Edited by HarrisRacing
GTR_JOEY Grand Master

GTR_JOEY

Posted
  • Author
Posted

Thanks for the post Patrick.

Your right the 83/75 is one of if not the best bang for buck turbo on the market. As you would have seen on my graph it did nose over a bit. My comments in your previous thread were as a comparison to my own results

My new set up improvements consists of

2.9 stroker

Raised compression to 9.1

Cleaned up head

260 cams with 11mm lift with a very aggressive fast opening lobe

Ferrea valve train with duel valve springs to eliminate any possibility of valve float (a much better set up the the previous tomei gear I had, old springs had only 60 pound of seat pressure)

Ceramic coated exhuast side.

This combination will be a large improvement to response, but I'm also looking to really get the most out of this turbo by pushing it past 450rwkw

Fingers crossed

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

    • Borci88
      Borg Warner EFR Series Turbo's V 2.0

      By Borci88 · Posted

      Not a problem at all Lithium, I appreciate your help regardless. I've pulled a small part of a log where the target pressure was 28psi and it spiked to 36.4psi. I've only just begun using Data Log Viewer so if I'm sending this in the wrong format let me know.
    • Lithium
      Borg Warner EFR Series Turbo's V 2.0

      By Lithium · Posted

      Sorry had a bit of a week and haven't had heaps of time to follow this, so apologies if I've missed something - any chance of showing a log with the rpm, turbo speed, MAP, and wgdc all in one view? Definitely an "interesting" problem, and while it's definitely worth noting that there was a similar issue with the twins I'd not completely put all bets on the root cause being the same thing.  Keep an open mind, follow the data.
    • Borci88
      Borg Warner EFR Series Turbo's V 2.0

      By Borci88 · Posted

      I built this engine approximately 12 years ago so my own head (brain) is a little grey on the exact hardware in the RB head, however what I recall is. Stock RB25 NEO TURBO Intake Camshaft HKS 260 degree Exhaust Camshaft (R34 GTR) RB25 NEO Turbo Springs  I ported/removed the exhaust stud humps found in the RB25 head so theres less turbulence but it wasn't ported/polished properly, just a hump removal. I've attached two pictures of the before and after to illustrate.     The ECU gets its boost reference from the nipple on the rear of the head on the intake side, behind the fuel rail. The wastegate gets its boost reference from a nipple on the cooler pipe immediately after the comp cover.  Could a decent pressure drop across the intercooler cause the wastegate to be seeing a higher PSI than what the ECU is seeing, and thus it can't control it accurately and quick enough?   We ran a line to the actuator and watched it open and close using an air compressor, while we didn't have a gauge on the line to see when it was cracking open, it was opening smoothly.  I just removed the gate now and even though the documentation says you need to open it in a vice due to preload (which I did), there wasn't any preload on the cap, which is something we noticed straight out of the box as well when new. This silver cap internally is threaded to the actuator rod that runs out the bottom of the straightgate. Not sure how I'm supposed to get this spring out to be frank.. Potentially but everyone else doesn't appear to have to stop at 500kw because of 6boosts design.  I would, but I think I'm getting to that point where if I'm going to do the head and make another 100kw, then I'm going to need a fancy gearbox and quite a few other things and 10k becomes 20k becomes 30k within a few months. I'm not necessarily sold on the idea just yet that the head is restrictive at 4000rpm (and what.. 300kw?) and yet doesn't seem to be restrictive at 7000rpm when it's making 500kw, however I'm obviously not closing the door on that theory.
    • Kinkstaah
      Mistakes were made, my R34 Story

      By Kinkstaah · Posted

      Yeah - Half the problem is I know this sensor actually goes to 150C.. I'm pretty certain it is min of 11C. So still more data required I suppose. It's really quite hard to get the oil temp to 100+ then immediately pull over and take a reading before the temp drops. Annoyingly I suppose the range I really 'want' is likely 80 -> 120C. TBH the ecu can't really *do* anything with it, and the gauge itself is very visible... ...but you know how it is.
    • The Mafia
      Borg Warner EFR Series Turbo's V 2.0

      By The Mafia · Posted

      My EFR 8474 Black, made 800awhp on a roller dyno. at 25-26psi. E85. Shaft speed was around 106,000rpm 1.01 rear. The rear is maxed.  6 boost Turbosmart 60mm gate 3.5inch exhaust  Head is worked to the shithouse. Bain racing. VCam. 272 exhaust. RB28 - RB26 foundation.  You have an intake issue. Start getting proper data and I mean go back to the simple things.  - Pressure test your intake - Block off the Turbo BOV, you don't need it.  - Test pressure before and after your intercooler If your head is pretty stock, that is your issue. Especially if it is NA.  Take it off and spend $10k on it. 
×
×
  • Create New...