Jump to content
SAU Community

Recommended Posts

Cheers

How does the .68 T4 compare size wise to a GT30 .63?

3" outlet?

Sorry for all the questions lol just trying to figure out whether I should lump it with a custom manifold for a td06, use my TD07 or sell it and get one of these.

Plus im a bit of a geek when it comes to this stuff lol

LOL only just noticed the intake temp, went to post and you had already posted...

So dodgy temp correction and boost wound up so high the dyno can't even read, INTERESTING

this is a stupidly high ramp rate to smooth it out lol, don't doubt the power, just how smooth it is lol

I attempted to enter a negative figure into a DD Dyno to check correction factor but it didnt except it. I tried IT of 1 dergree C, 12.5 and also tried unplugging the temp sensor and got the following corrections. Wishful thinking but imagine if the dyno was removing another 10% from the figure... :)

post-20010-1287131218_thumb.jpg

post-20010-1287131699_thumb.jpg

post-20010-1287131772_thumb.jpg

I attempted to enter a negative figure into a DD Dyno to check correction factor but it didnt except it. I tried IT of 1 dergree C, 12.5 and also tried unplugging the temp sensor and got the following corrections. Wishful thinking but imagine if the dyno was removing another 10% from the figure... :)

Thats generally been my understanding - the greater the intake temp exceeds the ambient temp the greater the correction (inflates power) and vica versa (deflates power). So there is no correction where intake temp and ambient temp are the same.

After looking at the graph this morning, Chea though there was a bit more in it :)

Starting to lift the head at that power so we're gonna have to leave it there for now. Have the Motive drag challenge next week, after that put a Tomei head gasket on and a 6262SP!!

I'll start making the vid

2m4ympj.jpg

awesome results PJ well done,

but

Look how the power drops up top....

Quick everyone should start hating precision turbo's like you hate Hypergears... :)

This engine doesn't have valve springs, don't think they'd be loving life right now. It would be to interesting to see if the power would hold flat then (some studs and a head gasket would help us too)

We'll log it @ the track for you :) Can't wait it should see close to 135mph trap speed!

  • 3 weeks later...

Well we've since replaced the head gasket in the S14, and while it was apart installed ARP head studs and a BC valve spring and a retainer kit, which has allowed us to rev the engine a bit harder.

The result was 392.3kW at the wheels with a 35psi spike which fell down to a stable 33psi.

For the guys who were sceptical before, we ran it at 29psi and got 367kW at the wheels. So there it is, the limit found of a 5557. Pretty crazy stuff really from a baby .63 exhaust housing!

If the weather is good tomorrow we'll be taking the car to WSID on full slicks :laugh:

Here are the sheets

rlexjs.jpg

10i5ph1.jpg

And now for the Skyline lovers, here are some pics of the R34 that we're building, you can check out a full spec list on our site at: http://www.powertune.com.au/projectcars-gtr.html

It now features a BC 2.8 and Precision GT4271R ball bearing billet turbo, Powertune twin scroll manifold, hopefully we'll have it run in and tuned by the end of the month, then of course straight to the drags :P

1177d60.jpg

2vvtauu.jpg

2czy911.jpg

For the guys who were sceptical before, we ran it at 29psi and got 367kW at the wheels. So there it is, the limit found of a 5557. Pretty crazy stuff really from a baby .63 exhaust housing!

Was not skeptical before... Was just noting that you had used more boost than you were claiming!

I myself am super impressed with your results, so much so that if you get your ass into gear and test a 5557 0.63 on a RB25 I would be very interested in purchasing as I'm just about to do a 25 conversion on my 32 this month and looking at a few options for turbos at the moment :)

Edited by SimonR32

Bit of an update for my rb25+5557 combo...

Picked it up last week (arrived in aus the day before) semi tuned.... still having dramas! Electrical/ignition, burnt the clutch the first night, no vct still, only 18psi atm on a verrrry conservative tune.

Feels good to drive with off boost, it starts making good power from 3k onwards.

I'm glad powertune has pushed this turbo to it's limmits... I wasn't going to push 30+ psi into my stock rb25. I'll see where we go at 250-260 odd on 98.

Cheers

Justin

Was not skeptical before... Was just noting that you had used more boost than you were claiming!

I myself am super impressed with your results, so much so that if you get your ass into gear and test a 5557 0.63 on a RB25 I would be very interested in purchasing as I'm just about to do a 25 conversion on my 32 this month and looking at a few options for turbos at the moment :verymad:

Yes the results are awesome, this time we turned it back to show that we were telling the truth about the boost though, as I can't show you the log on the Haltech... well I could but it's too much mucking around for a busy workshop.

As mentioned previously, we will offer free tuning to a donor RB25DET owner wanting to put one on a 5557 purchased from us. Don't be shy guys :) If we had an RB25 as one of our project cars it would be on it!

The turbo's and all other info can be found on our website.

And the 6262SP will be going on the S14 next after we race it, 40psi here we come. Wonder how/if the standard bottom end will let go!!

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

    • Sounds like you've got an interesting adventure ahead here with local support if you have trouble! My guess is that, unboosted, you will be OK with a small upgrade like -9. What will happen is that once the stock ECU sees more airflow than it expects it will add a heap of fuel and pull a heap of timing to be safe because it can't understand how it could get that much air without there being an issue. You will see clouds of black smoke and it won't pull hard through the midrange and top end. So, overall it will be a bit frustrating but should be OK. If you are still nervous set the base timing back 2o through the CAS, but it will be even more sluggish everywhere. As said above through...this is not my guarantee your engine won't be blown into a million pieces, leaving you looking for very hard to find parts A better idea is get a computer with logging ASAP, wire in a wide band O2 sensor and a use remote tuner. I've done multiple cars this way and while it is not as good as a specific tune on a dyno they can get it 90% right. I'd suggest if you can afford an R33 GTR these days you can afford an ECU and tune. And if you can't afford that you sure won't be able to afford the rebuild if it goes bad in the meantime,.  
    • Yeah it would be nice if someone took the time to put that sort of information together, but there are a lot of variations in looms. I think you are making this way hard for yourself if you just want to get it running....sourcing an SR20 with the right wiring will be a billion times easier than matching the RB loom to an S15 chassis. If you do end up going this way, you just need to trace every wire in the loom with a multimeter, 95% of them will go to a location you can confirm at the ECU.....and then post it up for the next person who needs it  
    • Just top it up with water, and keep a general idea of how much you added. It is normal for water to be pushed into and pulled out of the reservoir through the cap, and it should not be more than half full or it will be likely to overflow when hot. Any decent mechanic can do a pressure test of the cooling system to confirm if you have a leak. Keep in mind if it is only leaking a little and when hot it may well evaporate before you see it hit the ground
    • I'd ask the shop what they used and use that. Mixing coolants is sometimes OK, sometimes not, and you have know the details of each coolant to know whether it's a good idea or not.
    • Is it alright to top up with just another green coolant?
×
×
  • Create New...