Turbo T28

[foggyjames]

I think that's exactly what Mike is saying - when you've got a lot of air involved (hence why smaller turbo cars often don't have CBVs or BOVs), it can "back up" pretty quickly once you snap the throttle shut with a head of boost built up. The compressor tries to stall, which puts a massive load on the turbo shaft...wearing the bearings faster, and potentially resulting in a snapped shaft (seen a couple like this).

cheers

James

[Ross9]

Yes it would sound the same, it's the same thing after all, just the blades chopping the air and causing the turbo to stall.

A mate of mine once had a similar thing, and had to change some of the spec, and the turbo, at part throttle, like motorway cruising etc the turbo would stall/surge, had to back off and then on again with a bit more pedal to stop it. Not occuring at full throttle but the effect on the turbo is the same as what Mikey was mentioning, and yes eventually the shaft snapped and the turbo collapsed, dumped a sumps worth of oil doen the exhaust in not a long time...smokey lol.

Ross

[MikeyL]

OOOOPS!!! Ross!!

at least its not something you will have to worry about

Foggy, if your manifold will take a T3, this would be a good punchy unit. This is of course if your manifold will take a T3, and your downpipe has a T3 exhaust housing coupling.

can provide 300bhp and be on boost by 2-2.5k rpm.

Wayne, Foggy and Ross have confirmed what you needed to know

[foggyjames]

The manifold will accept a T3-flanged turbo if the flange is milled flat. Although T3 derived turbos are pretty popular on the RWD Volvo scene, I'm concerned that it's rather old technology. Having said that, they're dirt cheap, the range of interesting parts available for them is massive, and they're well proven - so it's an interesting suggestion!

I'll be running the stock baby TD04-13C at first anyway, so I have plenty of time to work this out.

cheers

James

[MikeyL]

Hi James,

Thats the beauty of the turbo. you can pick them up on EvilBay for under £100, they're tough old units and do spool up nicely, plus it'll give you a slightly better kick and the midrange would be improved. Again it runs out of puff at the top end if boost is higher than a bar but then a bar of boost on a cosworth engine is circa 260/270bhp at the flywheel.

You're not after breaking records, and as good as the GT range are, for what you're wanting the car for i couldnt possinly justify the expense.

Alot of people may question why you'd use an T series, but lets be honest, the T3 and T34 are both superb units. in fact i intend on using a T34 on an 850 T5.

Mike

Originally Posted by foggyjames

The manifold will accept a T3-flanged turbo if the flange is milled flat. Although T3 derived turbos are pretty popular on the RWD Volvo scene, I'm concerned that it's rather old technology. Having said that, they're dirt cheap, the range of interesting parts available for them is massive, and they're well proven - so it's an interesting suggestion!

I'll be running the stock baby TD04-13C at first anyway, so I have plenty of time to work this out.

cheers

James

[foggyjames]

It's a fair point - they are good value. There are also parts to bring them bang up to date, including modern geometry wheels, BB catridges and there's probably a bigger range of housings available than for any other turbo. The ATP 'ultimate internal wastegate' for the T3 (and others...it fits loads of Garrett units) is a very nice piece too.

cheers

James

[pyaap]

Originally Posted by foggyjames

The manifold will accept a T3-flanged turbo if the flange is milled flat.

Here's another solution from ATP, if you would like to preserve the "lip" on the flange:

"Volvo Flange Adapter for T3 Flanged Turbo to Stock Manifold"

http://www.atpturbo.com/Merchant2/me...egory_Code=FLG

[MikeyL]

tbh, i wouldnt worry too much about customising a T series from stock

GT series turbos are throw away items if the shaft snaps

[foggyjames]

Assuming the studs are long enough, that's an awesome piece of kit, and will save a few notes at the machine shop. I'm a big fan of ATP, but I've never noticed that chap before. The only problem I can forsee with it is that there is minimal clearance between the turbo (if using a redblock '90+' manifold and a TD04-13C) and engine mount on a 360. That spacer might be enough to just tip it over the edge.

All stuff to be lodged in the back of my mind for when the turbo swap happens

cheers

James

[Al115]

Have to say that after my experiences I will not use ATP again in a hurry. I bought a GT turbo off them that was so well assembled, the compressor wheel scraped against the housing! Imagine that thing spinning at 20k rpm