All being well, I'm sure it'll reach that target in your sig easily.

That is a rare exhaust housing, it's a turbo technics casting. Good choice, I had one of them sitting around not so long ago.

yeah kept my eye out for the exhaust housing for a while.... Although spool was awesome with original its been found by a good few tobe restrictive after 5500 revs.... Hopefully now i'll keep making power all the way to 7200 with the help of the the boost also holding alot better.... Really tailed off with my t3 super 60... Don't think the hole in it helped though!?

i also think it should easily reach that target but i ain't counting my chickens (or horses) just yet!...

nick

so it seems my exhaust cam is out by between 20-25 degrees...
would this explain the way it was running?
well anyway should be sorted by the end of sat so fingers crossed it runs ok... If not, keep an eye out for it in the "i'm breaking my coupe" section!

Nick

Much further out than that!

In your post #1151615 you said the inlet cam was at 7-8 mins past the hour and the exhaust cam 48-49 minutes past the hour, using the clockface notation

Each minute out on the clockface notation is 12 crank degrees. So if the inlet cam should be a 17 minutes past, the inlet cam could be out by 17-8= 9 minutes which equals an error of 108 degrees. If the exhaust cam should be at 43 minutes past the exhaust cam is out by 49-43=6 minutes which is an error of 72 crank degrees.

108 + 72 = 180 degrees, which is what suggests (to me) that the cam wheels being on the wrong camshafts.

p.s. If you do have a T38 turbo then it is good for over 460 BHP. In fact I have seen dyno figures sent to me by Turbo Technics of an Evo producing 583 BHP @ 6948 rpm with one of their T38s (Stage 3 TT S205).

if you think about it though (explained to me yesterday) if the crank is turned over once more from my original observation the the cams would have turned half a turn therefore being not that far out (pointing roughly in the right direction) so now the inlet is at approx 37-38 .... And the exhaust at 17-18 (but should be at 22-23..... So that would be a difference of 5 mins, if each minute equals 6 degrees then approx 30 degrees out...... (each minute equals 6 ddegress NOT 12... I think?) lol

regarding turbo, it not a turbo technics t38, that's a rollerbearing isn't it?
Me and saint have been having a running debate as to what my turbo actually is..... The turbo guy who built it used to run the exact one on his hill climb integrale but swapped to a gt2871r as he was given it to try by an american turbo company.... He did say that my turbo would make more peak power than the gt2871r....? We'll see.

A Turbo Technics T38 has a 73mm diameter compressor wheel and is 60 trim. It can be built with a ball bearing or plain bearing CHRA

60 crank degrees out it is then!
Think i remember my compressor wheel being very close in size to a gt3071 interms of inducer and exducer.... Think mine are 70mm & 51mm where as the gt3071 is 71mm & 52mm Irc??
The gt turbos are newer tech though and alot more efficient than my big old journal bearing cossie turbo!

nick

Closest (Garrett) compressor wheel I know to that is 69.85mm/51.65mm 54 trim T04B. Does it have 8 blades?

Pretty sure it has 7 blades... Not 8? May be wrong, that size seems very close to the dimensions i quoted though!
what sort of power do the T04b make?

nick

It's a pretty odd-ball compressor wheel. I think it might be a T04B T5/T6 trim - and I can't find a compressor map for it. I think you need to Google!

right found some specs for my turbo but still no idea of what it is or capable of? Lol

compressor wheel 71mm (7 blades)
exhaust wheel 53mm (11 blades)
M11 compressor housing with 2.5" inlet
55 a/r exhaust housing!

confused.com

Nick

What size is the inducer on the compressor wheel?

Well im's guessing a bit without pics, but if the exhaust turbine is 53mm exducer it is likely a stage 2 T3 turbine (standard T3 is 1.898" so under 50mm) and stage 3 is nearly 57mm so say stage 2 turbine at a guess

Compressor, well it could

T04B V trim as this is a 2.75 exducer (69.85mm)

Even a T04e 46 trim is a 2.95 exducer (74.93mm)

So I would be guessing a t04b V trim in a T04b cover as they are 2.5" inlet

I'll find a map for you, but if it is a t04b V trim it is certainly an old design turbo - all B series are of course,, but I think we discussed that when it was built

Nick, when is your "engine builder" coming to sort his mess out?

as you know know the problem, cant you get him over asap?

at this rate...Begbie might be finished before you!

NAR...

think i got confused....
not sure of exhaust wheel size, has 11 blades though!...
inducer and exducer are 71 & 53 respectively!

marco: engine SHOULD be running saturday! Wahoo!!

nick

well a T04b V trim has a 55mm inducer, so it isn't likely the V trim wheel in that case

fingers crossed for you mate!

Incoming text message

and i stand corrected..

does that mean begbie is done?!

nick

It sounds like a stock GT28 exhaust turbine and a 71mm 56 trim compressor - so it's like a GT2871 but with journal bearings rather than ball bearings in the middle.

Don't rely on this, but I've read that the exhaust turbine becomes restrictive due to its size/number of blades, so although the compressor is good for 475BHP (I've read) you won't get there because the turbine side will choke before you do.

Possibly why your mate got shot of it?

interesting! Well i was only after between 350-380 so hopefully will get there?! 400 would be a magical figure to reach in my little old 16vt, it'll just depend what boost level we can get to safely.... I was thinking max of 1.6-1.7 bar, but flea will have permission to go as far as he thinks possible!!

Nick

Like this maybe:

http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT28/GT2871R_743347_2.htm

But you have a smaller A/R exhaust housing.

Can anyone else identify the .55 A/R turbine housing? I don't know any T25 flanged Garrett turbos that use them. Or do you have a T3 flange?

It's a T3 flange, not T28, and T3 .55, thanks why I don't think GT28 turbine - I have never worked with T28 turbines but aren't they alot smaller and won't fit in a T3 flanged snail

Anyway, without pics it will be very hard to ID

just guess we'll have to see what it produces, it is a little anoying though not knowing what i've actually got..... On the other hand though its a bit more exciting as i could be completely blown away when i get "the call" from flea........ Or not

nick

According to this
http://www.jdmperformance.co.uk/item_detail.php?prodID=53005
a T28 turbine can be fitted (with machining) to a T3 housing.

If so, 400 wheel horse power potential!

I cannot find a T3 turbine smaller than 2.32" (58.928mm) diameter.

400 wheel bhp!.... That would be nice!
that's prob with the 84ar exhaust housing....
Where as i've got a 'piddly' 55ar..
although Nigel has proved its possible to get just as much ( infact more ) power out of his 63ar housing than the guys running 84's with the same cold side!

Nick

GT28 turbine 76 1.85"/46.9mm 2.09"/53.9mm (from GT2871R) NS111 is an 9 blade turbine from memory, Nick says above his is 11

It's smaller than any of the T3/4 family turbines already, so as the link says it has to be a special housing with a smaller turbine scroll, the .55 Nick has is a T3 cosworth one from memory so designed for T3 turbines.

T3 Turbine - - 1.898" 2.319"
T3 Stage 2 Turbine - - 2.122" 2.559"
T3 Stage 3 Turbine - - 2.229" 2.559"
T4 N Trim - - 2.071" 2.922"
T4 O Trim - - 2.296" 2.922"
T4 P Trim - - 2.544" 2.922"
T4 Q Trim - - 2.693" 3.111"

The T3 turbine 2.32" is just standard (rounded) is already bigger than the GT28 turbine so you would need a special housing with a smaller turbine internal, the T28 turbine is too small already that is why I didn't think it was that

There are plently of GT28 turbine sized T3 housings, with ATP it is a option to get the GT28 series with T3 flanges, as per the link. This is cosworth housing though I think

Without pics I can't tell sorry Nick and it all speculation so I will leave it there, the dyno will let you know

Cheers

Nick said above 53mm diameter and 11 blades, so maybe T25/T28 turbine shaft 435922-1?

Inducer = 53mm
Exducer = 41.7mm
Blades = 11

I agree that the .55 A/R housing is most likely from a Cosworth/Garrett T34...

I have a T35 and I'm pretty sure the standard T34/T35 turbine wheel is 58.9mm/2.32 inches

Need a quick answer, trying to find if cam wheels are wrong way round..... There is different part numbers on the wheels..
The one on the inlet wheel at mo is 76918 83
One on exhaust is 76918 85.... HELP