Jump to content
SAU Community

Recommended Posts

I got 280kw at 16psi at 6000rpm. I had no cat. If im correct u had a cat in ur exhaust system?.....Get rid of the cat and I can almost guarantee you will see around 20rwkw gain and response gain as there is less back pressure on exhaust wheel.

Edited by adam999111

I've got something like this

http://justjap.com/store/product.php?productid=18066&cat=&page=1

Will order a mid muffler prob tomorrow or fri and see if I can fix it all up before I go to Japan then make appointment for when I get back for another run. Just wish it wasn't 2 hrs to tuner. Driving through the city with a twin plate was a nightmare.

How far back was your dyno sheet Adam?

Edited by t_revz

I got 280kw at 16psi at 6000rpm. I had no cat. If im correct u had a cat in ur exhaust system?.....Get rid of the cat and I can almost guarantee you will see around 20rwkw gain and response gain as there is less back pressure on exhaust wheel.

Based on what exactly? There is barely 5hp difference between my car with the exhaust on vs off...

I've got something like this

http://justjap.com/s...066&cat=&page=1

Will order a mid muffler prob tomorrow or fri and see if I can fix it all up before I go to Japan then make appointment for when I get back for another run. Just wish it wasn't 2 hrs to tuner. Driving through the city with a twin plate was a nightmare.

How far back was your dyno sheet Adam?

My dyno sheet is on page 292. that power and psi i stated was actually at 6200ish rather than 6000, mind you its did make just over 290 before some timing was backed off.

Based on what exactly? There is barely 5hp difference between my car with the exhaust on vs off...

Based on the laws off physics.. In an Ideal world nothing after the dump on the turbo, will obtain the best results performance wise. any restriction in the exhaust is going to result in power loss, thats inarguable, its just when the gains don't become significant enough to worry about. Please dont get hung up on numbers, it might not be exactly 20kw... As with your exhuast, it must be a good free flowing one

Edited by adam999111

^^^

On the same time you are also running an external gate. I've also made 290rwkws on 19psi peek at 6200rpms at 17psi on the same turbo externally gated off the turbine housing. It some appears the external gate has greater gain used on stock exhaust manifold.

I've got something like this

http://justjap.com/s...066&cat=&page=1

Will order a mid muffler prob tomorrow or fri and see if I can fix it all up before I go to Japan then make appointment for when I get back for another run. Just wish it wasn't 2 hrs to tuner. Driving through the city with a twin plate was a nightmare.

How far back was your dyno sheet Adam?

that's quite a restrictive cat once it warms up

Only when it's warm? ^^^

when the core heats up, becomes an exhaust restriction, this easily can be done with a few squirts on throttle on full song.

yeh sorry i keep forgetting i have ext gate and t_revz is internal, but he will still see gains non the less without at cat.

Will also see some decent fines from the EPA if caught :)

Soon enough it will be free flowing. Just have to find a suitable muffler to compensate noise and bring it down quite a bit

I might be biased here, but HKS Super dragger, it's dead quiet man. Seriously not much louder than a stock VL 3.0..

I've used Apexi N1, HKS Hi Power, DRIFT, St Mays all on RBs, and the HKS Super Dragger has been the most quiet one.

when the core heats up, becomes an exhaust restriction, this easily can be done with a few squirts on throttle on full song.

Why would it only be a restriction when it's hot? The substrate doesn't change, it just gets hot...

Will also see some decent fines from the EPA if caught :)

Eh, we're in WA ;)

Yeah that's a good point. Easy to check too. I can fully understand not making as much as ex gate versions up top but should be close as I've got extensive head work and cams etc but I would think midrange should be near identical. But looking at boost I have 13psi at 3700 while Stao's latest was at 21 so no wonder it's 110hp lower.

Going to check actuator preload next day off and see if that's ok too. Try to double check VCT ASAP. Come to think of it I haven't heard the solenoid clicking like it used to. Vct obviously affects boost curve in a big way?

Vct is practically make or break for an RB25 on vct based cams.

if that's not working deduct something like 1000rpm for boost threshold. its silly.

Well it was done but cos I dropped the car off before Sean got there and we didn't chat he set boost to 18psi max and very safe. Only made 340hp but he told me to ignore the number as he can never reproduce Hp numbers that hypergear customers expect. So I drove home and gave it a couple squirts and it feels good. Maybe it was similar power but just low reading dyno...until I compared my result to previous results and it seems lazy on boost. Might need more preload. So thinking of taking it back after doing the exhaust and Sean said we can try put 21+ down its throat

Any other thoughts? Mine is red

Power

photo_zpsfe9a9fae.jpg

Boost

photo_zps4956dc8c.jpg

That's a little disappointing...

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

    • Have a look at that (shitty) pic I posted. You can see AN -4 braided line coming to a -4 to 1/8 BSPT adapter, into a 1/8 BSPT T piece. The Haltech pressure sender is screwed into the long arm of the sender and factory sender (pre your pic) into the T side. You can also see the cable tie holding the whole contraption in place. Is it better than mounting the sender direct to your engine fitting......yes because it removes that vibration as the engine revs out 50 times every lap and that factory sender is pretty big. Is it necessary for you......well I've got no idea, I just don't like something important failing twice so over-engineer it to the moon!
    • Yup. You can get creative and make a sort of "bracket" with cable ties. Put 2 around the sender with a third passing underneath them strapped down against the sender. Then that third one is able to be passed through some hole at right angles to the orientation of the sender. Or some variation on the theme. Yes.... ummm, with caveats? I mean, the sender is BSP and you would likely have AN stuff on the hose, so yes, there would be the adapter you mention. But the block end will either be 1/8 NPT if that thread is still OK in there, or you can drill and tap it out to 1/4 BSP or NPT and use appropriate adapter there. As it stands, your mention of 1/8 BSPT male seems... wrong for the 1/8 NPT female it has to go into. The hose will be better, because even with the bush, the mass of the sender will be "hanging" off a hard threaded connection and will add some stress/strain to that. It might fail in the future. The hose eliminates almost all such risk - but adds in several more threaded connections to leak from! It really should be tapered, but it looks very long in that photo with no taper visible. If you have it in hand you should be able to see if it tapered or not. There technically is no possibility of a mechanical seal with a parallel male in a parallel female, so it is hard to believe that it is parallel male, but weirder things have happened. Maybe it's meant to seat on some surface when screwed in on the original installation? Anyway, at that thread size, parallel in parallel, with tape and goop, will seal just fine.
    • How do you propose I cable tie this: To something securely? Is it really just a case of finding a couple of holes and ziptying it there so it never goes flying or starts dangling around, more or less? Then run a 1/8 BSP Female to [hose adapter of choice?/AN?] and then the opposing fitting at the bush-into-oil-block end? being the hose-into-realistically likely a 1/8 BSPT male) Is this going to provide any real benefit over using a stainless/steel 1/4 to 1/8 BSPT reducing bush? I am making the assumption the OEM sender is BSPT not BSPP/BSP
    • I fashioned a ramp out of a couple of pieces of 140x35 lumber, to get the bumper up slightly, and then one of these is what I use
    • I wouldn't worry about dissimilar metal corrosion, should you just buy/make a steel replacement. There will be thread tape and sealant compound between the metals. The few little spots where they touch each other will be deep inside the joint, unable to get wet. And the alloy block is much much larger than a small steel fitting, so there is plenty of "sacrificial" capacity there. Any bush you put in there will be dissimilar anyway. Either steel or brass. Maybe stainless. All of them are different to the other parts in the chain. But what I said above still applies.
×
×
  • Create New...