Master Power Turbos ?

[tridentt150v]

That's on a hub?

[Lithium]

Yep.  At a guess it would be just over 360kw at wheels on a Dyno Dynamics on its all in boost, a .82 housing would allow more I would say - with still decent response.  

[bj0rn]

awesome!  ive been keeping an eye on these,  youre right about data being thin on the ground.  really good results too.  what were the other cars and model of mp that 'just worked'?  

[Lithium]

A RB25 powered GTS4 circuit car running a .82a/r R595 - I didn't really mention that because the car does circuit racing, not time attack but actual laps and laps of racing on stock bottom end and 98 octane so I wasn't really squeezing out it's full flow potential on the dyno... everything was done to ensure he could rely on it for laps on end.   It made ~295kw @ hubs on 98 octane at around 16psi, hitting target by around 4000rpm.

Another was an R545 with a .82a/r housing on a Honda F20B engine (2litre twin cam VTEC, a bit like a destroked H22A) in a Honda Accord.  That only had ~540cc injectors so was not making big power either, but was making good boost by 4000rpm - again another one I never got specific on because the turbo clearly had plenty of flow to spare, the power figure (just over 200kw @ hubs on ~10psi) wasn't going to do it justice.

[bj0rn]

1 hour ago, Lithium said:

A RB25 powered GTS4 circuit car running a .82a/r R595 - I didn't really mention that because the car does circuit racing, not time attack but actual laps and laps of racing on stock bottom end and 98 octane so I wasn't really squeezing out it's full flow potential on the dyno... everything was done to ensure he could rely on it for laps on end.   It made ~295kw @ hubs on 98 octane at around 16psi, hitting target by around 4000rpm.

Another was an R545 with a .82a/r housing on a Honda F20B engine (2litre twin cam VTEC, a bit like a destroked H22A) in a Honda Accord.  That only had ~540cc injectors so was not making big power either, but was making good boost by 4000rpm - again another one I never got specific on because the turbo clearly had plenty of flow to spare, the power figure (just over 200kw @ hubs on ~10psi) wasn't going to do it justice.

thanks for the reply mate.  i was looking at either the r595 or r545 for an unopened sr on 98 with around 18-20psi down its throat.  i like the 59/59 r595 wheel match a bit better than the 54/59 r545, but it would be fairly laggy id imagine.  

[Lithium]

4 minutes ago, bj0rn said:

thanks for the reply mate.  i was looking at either the r595 or r545 for an unopened sr on 98 with around 18-20psi down its throat.  i like the 59/59 r595 wheel match a bit better than the 54/59 r545, but it would be fairly laggy id imagine.  

What power are you aiming for, with what fuel etc?  Stock cams?   One of the things I tune has been running a Kinugawa TD05-16G6 with the 3" intake (TD06 style compressor) for the last few years - completely stock internals (including cams), and flex fuel on up to 20psi. Honestly, it is an amazing match imho.    I know it's not a Masterpower, but it works so well I don't know why you'd go for something different - especially if you are running with an external gate.  The thing can hit 20psi+ at around 3000rpm in higher gears, and has trapped at around 120mph in the 1/4 mile - is pretty rapid.

Edited March 19, 2017 by Lithium

[bj0rn]

as above,  around 18-98 on pump 98 fuel.  unopened so yeah stock cams.  e85 is only available at a couple pumps in perth so im not really looking to go down that route.  my old car did 119-120mph passes id be pretty happy with that haha.  350rwhp would be nice,  so whats that around 280rwkw or there abouts?  makes 270rwhp on a disco pot at the moment and 110mph. and yes will be external gate. 

[Lithium]

6 minutes ago, bj0rn said:

as above,  around 18-98 on pump 98 fuel.  unopened so yeah stock cams.  e85 is only available at a couple pumps in perth so im not really looking to go down that route.  my old car did 119-120mph passes id be pretty happy with that haha.  350rwhp would be nice,  so whats that around 280rwkw or there abouts?  makes 270rwhp on a disco pot at the moment and 110mph. and yes will be external gate. 

Hang on - you are running a discopotato on 20psi already?   

I'm kind of inclined to think that there probably isn't a huge amount of point in upgrading the turbo and running 18-20psi without doing cams, the cams are potentially the limiting factor in your setup at the moment I'd have thought.    280kw @ wheels on 20psi with pump gas on stock cams sounds pretty optimistic, regardless of what turbo you use.

[bj0rn]

yeah at the moment 18psi, stock motor,  disco,  270rwhp.  

the other idea was to stay garrett and go up to a 3076. you reckon the stock cams will limit it regardless of what turbo? 

[Lithium]

I guess I haven't had HEAPS to do with SR20s, but they seem like they aren't that great on stock cams - at least from what I've seen so far a GT3076R would be a waste as you'd make well short of what they are capable of on 20psi but get heaps more lag.   For what it's worth, even with the 16G on 20psi the turbo seems to have more flow available

[bj0rn]

alright something to think about.  cheers. 

[Skepticism]

Interesting that the comp map looks quite similar to 7670 despite the wheel having much larger dimensions (59/80 vs 57.2/76.2)

Edited March 21, 2017 by Skepticism

[SKYMAGGOT]

Would the R595 be an upgrade for a T67? Looking for a T3 open option.

[Lithium]

My gut feel is they're much of a muchness for flow, but the R595 would spool better

[SKYMAGGOT]

At a guess would you think it would be enough to make it worthwhile or too close of a sidestep?

[Lithium]

Not sure I'd bother tbh.

[SKYMAGGOT]

15 hours ago, Lithium said:

Not sure I'd bother tbh.

Thanks, will leave it for now.