R32 TT

Well.... everyone’s being trying to stop transmission of late so...

The 4.375? Nope - still got front and rears (the rear includes a full GT-R diff housing, but no diff).

If nothing gets in my way (and plenty is trying to) I should have a result this weekend.

Yeah have to say I had similar with my 8374 a few years ago and was also disappointed with little casting dags on my 8474... They could be better finished given they are the premiere models in Borg Warner’s line up..

Good grief... you're right. Problem is that if you google "Matchbot" using Chrome in Australia, the first link takes you to this 'old' one. BW need to take that down.. would take 2 mins to do. I even have a response on FB messenger from them apologizing but they don't know when the new turbos would be up on matchbot (that was 12/12/19, so only 4 weeks ago.. ) If their own people don't know its up........... : /

I agree - and on their "premiere" line of turbos, you'd think it would have been done almost on the day they were released.. Still - good to double check what I've gone and done...

Matchbot now has the latest EFR range up (finally!) for anyone that is interested.

PS Merry Christmas.

I guess it all comes down to what you want out of it. I went from 0.92 IWG to 1.05 EWG on a 8374 - no other changes and while I gained a bit up top - I definitely noticed I lost some 'punch' out of slow corners. For Tarmac Rally Sprints and so on, this does hurt me a bit out of slow corners (of which there are many) - but I'm sure it would be a bit quicker at the drags. So great, quicker car on paper - slower time at the Sprints.... Everyone seems to get hung up on this and goes for the larger housing because "its less restrictive and makes more power".. and then in the same breath talk about area under the curve. I will say this though - if you're running a sequential - some of that thinking goes out the door since you can pretty much always guarantee the turbo will be in its sweet spot. But at that point you may as well look at a bigger turbo altogether too! Why bother with an 8474 when you can have a 9280 and just drop a cog?

Lol - the 'real race car' scares me. And you can talk anyway....!

Well I have been massively held up by suppliers - mine should have been ready 6 months ago - but its gone around in circles and frankly hasn't been a good experience. No point dwelling on that though. That said - things are FINALLY coming together and so I hope to have mine going sometime in early/mid Feb. There is still a bit to do. It will be 3.2L Nitto, 8474 / 1.05, Kelford 272 10.8mm/Beehives/Ti Retainers , Light head work with 1mm oversize valves, Dry Sump. (the old motor was 3.0L, 8374 / 1.05 (previously 0.92 IWG), HKS 264 10mm, 9L Wet sump with various breathing mods etc.) Don't expect more than 530-550kW at hubs at 25psi - but hoping for strong delivery from 3500 through to 7500rpm. May need a cam change to help - we will see. And I guess we are going to see what eMAP we get. I'm hopeful it will remain under 1.5:1 and I'll be happy with that. Please, could you all take moment to close your eyes and think happy thoughts for my Syncro PPG gearset.

In my opinion for a street car I’d be sticking with the 1.05. It will be more usable and responsive. I used a 0.92 IWG on an RB26/30 and it was good. Yes it opened up a bit with the 1.05 I’m using now but I’m on the fence about the improvment. if you have a sequential then sure go 1.45 as you will always be able to pluck the right gear and “response” will be good.

...have they finally got the 8474 up on matchbot have they?

Sorry what I meant by saying "it can't be" (when referring to 1:1) was that that is really very good and not an indicator to me that the Turbine housing is a restriction. Sounds to me then like its probably pretty good to drive!

Ah ok - so 1:1? (can't be...) Or 2:1 (unlikely, surely?) What makes you say that eMAP is showing a rectriction. If MAP=eMAP from 5k onwards, that's not really restrictive I would not have thought. If you're out of Injectors I'd and pushing 36psi I'd say you're on a low reading dyno at a guess....

Which turbo and what rear housing are you using - on what size engine etc? And what emap/map are you seeing roughly?

I’m surprised that speedo still worked after you had it - seeing as it only goes to 180km/hr Damo! ? needle wasn’t bent?

Well done mate - that must be a relief. Smoke machine eh - how did you hook that up..?

And if you are operating at that point on the MAP that Lith shows - its not very efficient at that point of the map - so are your intake temps getting very hot? If they aren't this might indicate you're not actually at that turbo speed and perhaps you are reading it wrong. If they are, then I guess that backs up that you are working the turbo hard and there is likely a leak.

What capacity engine is it mate? 2.6/2.8/3.0?

I like that he appears in the reflection to be enjoying a relaxing cigarette after sex.

Thanks! Its does recover pretty quickly. It tapers up to a 4" Dump pipe off the back of the turbo. Then at around where the cat would be it tapers down to a 3.5" Titanium the rest of the way - with two straight through Ti mufflers. There is a single 50mm Turbosmart gate to atmosphere off a divided 6 boost manifold. (single wastegate port though) Standard BW BOV in compressor cover being used.

Does it nose over after 7000rpm at all? Yeah it does begin falling off at 7000 - but not sharply - I'll sometimes rev a bit past 7500 if I need to hold a gear. Typically I find myself changing at around 6800-7000 not for any other reason than it just feels right. For those interested here is exhaust pressure vs boost. Generally seeing around 1.3:1.. Crossover where exhaust begins exceeding boost is around 6200-6300. (this is the 1.05A/R) I am hoping that the 8474 being more efficient at higher boost levels will mean lower shaft speed required, less drive to the turbine and therefore exhaust pressure will still stay reasonable for the power goals I am after. (while maintaining good low down boost threshold)

You can see on this Dyno sheet how we are bring on boost gradually. (for those wondering why its not snapping to full boost immediately)

I've just been playing with video and Motec Logging to overlay some gauges onto my videos. Now the hard work is done, should be easy to add this for future videos. So here is my 8374 on 3.0L at a recent event. Running around 23psi. (260kpa) Will be good to get the 8474 on for comparo in some weeks - will definitively do a back to back test. (I should add that we do have boost by rpm - so we are not trying to make full boost at 3500rpm, hence you'll see a more gradual rise in boost with revs)