Lithium

If you aren't changing the ECU then don't change the turbo - it'd be folly to put an 18G onto an RB25 and try and run 13-14psi without tuning.

Nice! How is spool? <br /><br />Sent from my GT-I9505 using Tapatalk<br /><br />

To clarify your question - you are looking for more spool/response without changing the turbos? They are way oversized for that power level.

Nice - definitely a bit of improvement there, how were the intake temps this time?

FP Have just started selling their Super94 HTA and Super99 HTZ turbos with T4 twin scroll turbine housings, which personally (and I am sure plenty of others into their RBs ) is relevant to my interests. Good luck, hope it come sometime this month - I am excited to hear how this goes and it's not even my car haha

Here's a wee GoPro clip from this weekend, mate's S14 running the TD05-16G (anti-surge housing version) doing a street sprint around an industrial area, ultimately a low speed "circuit" so this clip isn't really one to show outright power so much as show how usable the power that these things can bring to the party is. The car is using G4 Link boost control setup up to run wastegate boost in 1st and 2nd gear, and ~16/17psi in 3rd - in an effort to keep the car from trying to make it look like a D1 event Even with this setup the car was quite excitable in 2nd gear, the owner ended up finding it quicker to keep it in 3rd gear for most of the track - which is where I am coming from showing this clip. For such a cheap turbo capable of hitting high 200rwkw fairly happily I reckon the transitional response and also low down pull (there are corners here where it is usefully accelerating from around and even under 3000rpm) are very decent.

I hope you finally get some resolution soon

It's in an S13 drag car in the US, aiming for 7s: Still on stock crank and girdle! Good luck for Friday, be good to see how it goes with the new intercooler etc

I was just reading about a stupidly powerful (like 1200+whp) RB25 result that just came up this evening then remembered this... did this get back to the dyno? And the strip?

Yes - as far as I know they are. The 16Gs from all I have heard have tended to be a little more flow friendly in the "TD06" compressor housings that most of them come from Kando with, not sure exactly how true that is but the 16G cars with the bigger housings seem to punch the better numbers... we treated that as plausible enough that it's what was decided on

Doh - was hoping for a dyno plot, but watching the vid - damn, that is clearly both making many many kw and coming on very nicely. Impressive!

Looks a lot like the housing most typically used on GT3071R but as others have said, check the core (solid bit between the two housings) for a serial number <br /><br />Sent from my GT-I9505 using Tapatalk<br /><br />

Interesting - what were the relative spool and power numbers? Was there absolutely no other change in the whole setup? Probably no need for the anti-surge in most cases anyway, but still... I'm surprised that there is that big a difference. I'm not surprised there is perhaps a slight difference - though.

Who tuned it, and how do other RB25 compare on that dyno? Odds are that it's nothing to do with the turbo itself. I've heard this quite a bit but haven't seen the testing which confirms this - is there a thread or some results which show this? I'm still really impressed with the only Kando turbo I've used so far, it appears to have no issue at all with spool or making power per psi - with an 8cm internal gate making 20psi by 3600rpm on a stock SR20DET, 250rwkw at 16psi on E85. If a non-antisurge one is substantially better, then wow.

Nice Something a bit pumpier is going to need to go onto that thing Keeping with Borg?

A guy I know is doing an interesting twin turbo setup with his Supra which sortof fits into this topic - while I am not convinced by his approach I am watching with great interest, this conversation (and the potential outcome) may be interesting to people here: http://www.supraforums.com/forum/showthread.php?720625-Kevin-s-Compound-Sequential-Twin-Turbo-Design

Is that a parallel twin turbo setup on that RB25? Doesn't look like a staged twin turbo setup to me, if it is then it hasn't necessarily be done overly well - as Stao implied, there are single turbos which would provide comparable spool with nicer power delivery and at least as much power.

So we finally have a local drag strip almost ready to open and my mate who owns this Silvia wouldn't mind getting the car to the strip for a bit of fun so we went out for a bit of road tuning recently to squeeze a bit more out of it. For reference sake it made 250rwkw @ ~16-17psi on E80 with a completely unopened SR20DET and made full boost at 3500rpm, so we went out with the plan of winding it up until we ran out of fuel or hit 20psi - as it turns out we maxed out the ID1000s (55psi base pressure) at more or less bang on 20psi, so that all matched up pretty well. With the Kando 1bar actuator I am having to push up around 75% duty cycle to maintain ~130-136kpa boost (~19-20psi) over 5500rpm, which is working a fair bit harder than when we were working with 16-17psi - at the moment I am guessing it MIGHT be more to do with the actuator as going by what I've done with the fuel map to keep it happy at around 20psi it is still pumping pretty good air through the engine. It doesn't really warrant a full dyno tune, but the owner MAY get a power run in sometime to see what the changes have made. What I can report is it has made a heck of a difference in terms of how the car goes, it feels like an animal compared to what it was on 16-17psi and our datalog analysis agrees that it is going a lot better - so I'd say if it goes on the dyno it'll blow the old 250kw effort out the water. Should be interesting to see how it goes on the 1/4 I will provide results if or when that all happens!

Hard to say for sure but Mustang are the lowest of the US dynos. Fwiw the car ran over 165mph with the 6766....<br /><br />Sent from my GT-I9505 using Tapatalk<br /><br />

To give this a bit of a nudge - here's a comparison of a car running a Precision PT6766 versus one running a FP Super99 HTZ on an EVO running 47psi, probably about 300-400rpm difference in lag and near 100whp more on the same boost level! The Super99 is NOT on full attack mode here, by the way - at this boost area the tuner/owner are happier doing the rest of the tuning on the track as you are probably on bought time with everything when pushing that hard. Has run 8.8 @ 168mph so far with this turbo on a cold track with big traction issues, will be interesting to see how it goes next season with more seat time etc.

Possibly an S300SX 8375 that you haven't quite got the measurements right on? Measuring wheels isn't always done perfectly..

That wouldn't surprise me too much but the T78 is a smaller turbo so not comparable. Compare a T88 with the T51R and the T51R response will look a lot better, then no doubt go to a modern 67mm billet turbo and things start getting quite interesting <br /><br />Sent from my GT-I9505 using Tapatalk<br /><br />

What T78 was it? Surprised there isn't a difference in spool! PS. There is apparently also Gen2 CEA versions of the 62mm and 64mm compressors coming too. This outta be interesting!

Yeah that has been discussed, we aren't short on ideas - it was just going to be particularly helpful if there was a comparison between a turbo that has been on the car before... and one of the options that could be considered. One of the points of consideration is if the PT 64/67mm would make that kind of power at the lower boost levels (comfortably under 30psi) that a highly cammed/ported RB would like to.

550-600kw at hubs, C16<br /><br />Sent from my GT-I9505 using Tapatalk<br /><br />