R32 TT

Well I'll start by saying I'm not an engineer. I am going to go with the KiwiCNC ones. They are made of 7050 alloy have good fillets and radius. The material alone is in the order of double the strength and fatigue resistance - Those bolts, once torqued correctly place most of the load at the flat face of the mating surface - the 'stretch' you're talking about through torqueing them up would be far more than the extra stretch 'load' placed on them from a steering input or bump. (in my opinion) so I doubt they would flinch. - but again "not an engineer". oh and I don't think stitch welding 7050 is a good idea, likely just weaken the material (from what I read)

Those bolts would be orders of magnitude stronger that cast aluminium though. And its mainly clamping force, not shear they are dealing with?

haha yeah those or the KiwiCNC ones.. but I need to go buy that lotto ticket you mentioned (and win) to afford them. They do seem like a really good thing though - especially with the R35 bearing upgrade.

I have been wondering the same thing. Ikeya Formula here. Add A050's and they are under a lot more strain than stock - plus that lever as you point out. Still you'd think you'd hear more about it.

Yep - well I do more tarmac rally sprints and a little bit of circuit. It hasn't had any direct hits in the 20 years I've had the car - other than one or two 'bad bumps' and a curb but that was in the correct direction - ie wheel hitting it rolling, so tyre and spring took most of the impact. Definitely sends a chill up your spine though...

Just had this happen to me too. R32 GTR. Also broke "just before going out onto the track" - someone up there is looking out for us... Very scary since I was about to do a narrow street course with zero run-off and curbs everywhere. Many people on here upgrading to billet uprights and R35 bearings? Or buying new OEM knuckles? I am not keen to replace with another s/h 30 year old fatigued part.

How did you get on with this? Did you end up fitting a prop valve?

Yep - I have had three different EFR's - and still run an 8474. All have had this casting issue and I didn't like it either. The Turbo's perform well - but its disappointing to see this lack of quality control - and yes it does make you naturally wonder if there are other problems that you can't see. I think that Borg Warners attitude to "its fine, and doesn't stop it working" is not a good thing. As others above have said, other manufacturers seem to get their castings nice and tidy and you would expect that the top of their line be well finished. Maybe BW should have a read of this thread and think about it for Version 2.0. PS. I've had 8374 and 8474 back to back on same engine - and I can say that in my experience the 8474 definitely does not spool as quickly as the 8374. I can say this from dyno charts, seat of the pants feel, logging and track times. The 8474 does exactly what you would expect: Spools a bit later (200-300rpm), and makes a bit more power up top.

so that's what - 4 days you've driven it?

6466 is tempting with the 5 Speed.

Yes all good - the only way for me to know is swap to a GTX3582 or 6466, perhaps 6870 to compare. A fair bit of money just to experiment though, and then - will I miss how it drives...? that said the 8474 is noticeably lazy compared to the 8374 for just an inducer change. Its not the "same down low but more up top" the internet seems to suggest.

Yep - following. Well then I guess the map has to be wrong - or I am making close to 900 engine hp. Which I doubt.

Sorry what I meant was, in answer to this question - "Do you reckon you're making the power you'd expect when your compressor speed and boost level suggest you are pushing at least 90lb/min of air?" - I'd say 'I think so', given the restriction to overall flow caused by eMAP. Would that be correct? Or am I misunderstanding?

I haven't looked at it on the map - but even if the compressor is making 90lbs on the map - there is that 1.2:1 back pressure no? Hence flow would be less?

Interesting that everyone is saying back pressure is a thing - I assume that is only once you starting pressing out 900+hp? Here is my 8474 using 1.05A/R on 3.2L Nitto. about 750hp at hubs. eMAP/MAP is rarely over 1.2:1 as you can see here 1.17:1 @7515rpm Yes circuit car, not Drag car - but I guess I this would be around 800-820hp at the engine - at what point does exahsut pressure become a problem - ? Or do you think I already have a problem...?