Jump to content
SAU Community

Recommended Posts

Heys guys I own a 96 gts-t with an Rb26 transplant with the following mods:

Garret gt35R –700 horse and custom manifold, turbosmart ex-gate 42m

Wisco forgies

Shot peened and linished rods, arp bolts

Heads ported (JHH)

Tomei Cam gears

Halteck ek6-Halteck boost controller

Sard 700’s and Boshe o44

The car has made 386 horse (280 rkw) at 18 pound with the above set-up. From the quick research I have done the hks 2530’ s flow about 350 horse each as with the T517’s so our flow ratings turbo wise are similar 700 horse. After seeing what you guys are making I am left scratching my head as to what is wrong with my set-up. From the graph’s I have seen there is a 30 to 50 kilowatt difference….

My question is what the heck have I done wrong, and is there a big difference between states (I am in queensland) between dyno’s. Most of you guys who have seen or know of RNS11Z set-up and he made 420ish horsepower (I know it was a RB25) with a t88 and still wasn’t close to you guys, so what up.

Maybe my horsepower/kilowatt conversion is way off….any ideas? Also sydney kid what is you're formula for working out spool rates.

What is wrong with my set-up. From the graph’s I have seen there is a 30 to 50 kilowatt difference….

My question is what the heck have I done wrong..........

Also sydney kid what is you're formula for working out spool rates.

Hi help. let's start with dynos, the most popular is Dyno Dynamics with Shoot Out Mode software. If you are not using the same, then the comparisons are difficult to say the least.

386 rwhp is 288 rwkw using the usual "divide by 1.34" method.

I don't have a "formula" for working out spool rates, I just use experience on what we have seen in the real world. I can extrapolate that accross different engines and engine capacities. It is not perfect though.

As for what's wrong, let's start with exhaust, you didn't mention it? Intercooler? Pipework? Also I have a rule of thumb that says over 300 rwkw = upgraded camshafts, have you done them?

Without a graph of boost and A/F ratios, I am stuggling to suggest much else.

Sorry intercooler is a hks item all intercooler piping is hpc coated. As for exhaust it is an apexi gt item. I read a post about exhaust choking big horsepower car I think it was by "steve" so the thought did cross my mind was going to put the car on the dyno and drop the pipes to test the theory.

No I haven't done the cameshafts would rather spend the money on a three litre bottom end to be honest. Do they make that much difference for the expense.

Cams make a huge difference. Thats were i was losing most of my power. If your still using matty's dyno and making 380rwhp on his dyno, thats about 460 on other dyno's. His dyno is a fair wack out. It could also be your ecu that is holding you back due to no one being able to tune it.

I think your motor is being choked by the standard cams. No matter how much boost you run, the cams are going to dictate how much air is able to flow into and out of the engine (ok, that's pretty simplified, but that's the gist). You're going to need cams with a 3 liter bottom end anyway, so don't think of it as money wasted.

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


  • Similar Content

  • Latest Posts

    • Welcome Jan, It's very likely that you are in over your head. You'll just have to learn to swim hard and fast! These old rust buckets have more ways to bankrupt us than almost any other car. But hopefully there's nothing wrong that ruins the whole show! We can help a fair bit. There's plenty here who've been fixing these things for >25 years. cheers
    • Hi all. First off, thanks for reading my post. So end of last season I put the car away knowing I was leaking at least two fluids. One of them being rear turbo's oil. I went to my car recently that is waiting in a garage to take a peek with my boroscope to try and see if I can narrow down the souce of oil before taking it out of storage. What I found is not so great I think. The rear turbo is (probably) leaking from the oil drain. The hose and it's clamps are probably the original ones, so most likely just worn out or loose. However I spotted a line of rust going straight down from the turbo oil feed, as if water leaked out of there at some point. Also explains the red liquid that was dripping from my front subframe, which I initially thought was power steering. I can even see coolant drops hanging off the side of the oil pan as well. After a quick hit on the web I found a select few discussions about porous engine blocks. My question is if the pics of the turbo oil feed and the left hand side of the block (imgur link below) looks like it could be exactly that to you. Maybe someone in the community has seen it before and knows what it looks like. If it actually is a porously leaking block, has anyone attempted at fixing it with simple methods like putting a sealer in the cooling system and using something like jb weld on the block surface, or will it just leak in 2 weeks again? I could not find any detailed info or pictures on this topic. If I need a new engine, tell me softly. https://imgur.com/a/knVvmZ8
    • Hey all. I'm 23 and from Germany, September last year I bought a mildly modded 1995 GTR Vspec. Looks great and was fun so far, but I already have a list of issues of various severity that I need to take care of, potentially growing longer the closer I look. I just hope I'm not in over my head, I really want to keep the car and work towards it becoming great. I hope y'all will help me out in getting there, I am positive I will need help sooner rather than later to figure out how to proceed. greetings, some pics of the car I posted to imgur. https://imgur.com/a/StKkabz
    • Would be interesting what the price would be without the barracuda wheels. Looks like he dropped it down to 40k. Maybe his mate wasn't correct about the 50k evaluation. Has always been a dream of mine to own an auto 33. Looks like I'll have to keep saving my pocket money or ask mum for more pocket money.
    • Thinking about importing a stagea as a family car since i’m getting married this year, thoughts? Me and my fiance both like stageas, but don’t have any experience with them
×
×
  • Create New...