Jump to content
SAU Community

Recommended Posts

what gear was 18psi at 3000 on ya gt? My GTX is prob 3800 @ 21psi second gear internal gated on 98 :whistling:

yeah im thinkg bout the .82 external wastegate 56t on bp98 i used to have a 3071 that made 280rwkw on 18psi but wasnt a very big pull but now i have a different rb25 which is alot healthier

  • Replies 119
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

yeah im thinkg bout the .82 external wastegate 56t on bp98 i used to have a 3071 that made 280rwkw on 18psi but wasnt a very big pull but now i have a different rb25 which is alot healthier

mate if you want an easy 300 go the kando t67

it is arguably similar in response to a 56T 3076 but is $800 delivered and actually gets about 330kw on 20psi

800 will buy you a 3076 housing... its good value and theres a massive thread on them now. please read it.

I think the T67 is a fantastic turbo but needs an external wastegate and really should have an aftermarket exhaust manifold compared to the 3076 which does not need either so puts it really in the next category up.

never really updated this. well here it was as of a few weeks ago. currently sourcing bigger gate springs and going e85 in the next week or so

Interesting on your graph - it almost looks like the 56T is actually surging around the 3000rpm mark.

My GT3040 (the 600hp one) did a similar thing, wasn't quite as severe but it also started to ramp, drop away a little, and then re-ramp again.

It was *barely* audible unless in specific conditions, but it was hurting the performance none the less.

Did you notice any surge around that point with the 56T? It's certainly not known for it!

Be interesting to compare our setups once mine is on E85 next week as our setups are similar :thumbsup: when are you seeing full boost and what size are your injectors mate?

Ive got 850cc injectors a tomei pump and a GTX3071R internal gated

Full boost in 4th is about 3200. Didnt change at all when I went e85. And I'm using nismo 740cc and Bosch 044 pump.

Nismoid; Mines the 52t. I don't notice any surging

The comparo graph though (from page 3) the blue line vs the red line.

Ah mis-read, so it was a 52T just a housing change.

The blue graph has very "suspect" dips that usually come with surge as mine was exactly the same, interesting either way :)

If ya didnt notice then might have just been tune or something.

yep.

also it seems its down about 20rwkw at the 3080rpm marker over both other set ups.

Martin did say it kept wheel spinning around the 3000rpm mark, would that do it also.?

Well wheelspin would cause those dips

But it shouldn't be turning tyres if strapped right or the ramp rate gets changed to suit

This tune was done on federal RSRs. The last one on potenza re001s that were a lot wider.

The only thing that's changed between then is the fuel and the rear tyres. And last time it had no dips. Might just go back with the potenzas and see how it goes

  • 3 weeks later...

in the interest on science, and because i love changing turbos, i recently pulled off the 52t .63 rear and put on a 56t .63 rear just to see what the difference was for the turbo coming on, with unsurprising results. The difference seems to be negligible with boost coming on 150rpm earlier back to back. same dyno etc.

next step is to go to a .82 rear and see if that will solve the surge issue. as the .63 really didnt like it when i went e85 and whacked some boost into it

will be doing this next week

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



  • Latest Posts

    • Hard line it, you will be thankful later on, if you car had hicas, use that as your return. 
    • Hydro lifters not bleed up could be the ticking noise
    • You know the worst thing about acquiring more space for me? I tend to acquire more things to fill the space...
    • Ended up spending a WHOLE day yesterday cleaning and rearranging my shed.  Due to the aforementioned disorder, my shed is as cluttered and confused as my brain. Again, because of said disorder,  at any one time there are 5 projects on the go at once and because they're still on the go I don't put everything away so I can "get straight back to it" which rarely happens.. So anyway,  I bought a couple of cheap 2mx2m all steel "pallet racks" to put in my back shed.  The idea is to then take pretty much everything out of the main shed that isn't car related. Most of the garden and building stuff is now booted out to the back shed and onto to the shelves where they belong! There's still more rearranging and reallocating to do and it's still a bit busy in there but it's a massive improvement on how it was previously. I've discovered floor space I forgot I had...  For those that have fully dismantled a car before will understand just how much space it takes up!  Particularly panels, bumpers, engine/trans, etc.  I've got stuff hanging on every available wall to get it up off the floor!  This is not exciting content for a blog but has certainly made the shed feel like a more work ready space now!
    • Updating results from our ATR43SS-1 turbo in T3 .63, OEM bolt dump pattern. Not a big number but pretty sweet for a stock Rb20det. Car's managed to pull 220rwkws at 20psi, perfect boost control internally gated with EBC and excellent mid top end power band as they usually skydive after 5.5K. Usual bolt on supporting mods and inlet plenum and factory location exhaust manifold. Pump 98 fuel was used (Ron 93).     
×
×
  • Create New...