Have to agree there,

Only 150Ft/lb @ 3k rpm

Peak torque at 4500 rpm

Is 400+ turbo figures,

I expect the lack of AVCS plays a part down low tho.

Would be expectin a lot more down low

My old VF35 on my Sti for comparison


https://cimg0.ibsrv.net/gimg/www.sco...feeda3722d.jpg

And on 102 fuel plus ported heads etc.
You would expect some rapid spool and acceleration :wonder:

Nice results there,What max boost was the vf35 running?

Odd results. I'd expect the complete opposite; quick spool and then run out of puff.

It's as if it's running a bigger (too big) turbo like a 20g. Slow spool and then ultimately can't breath/fuel enough once it comes on boost.

Standard ECUtek map so think it was 1.55 limit,

FMIC too

Heres the road dyno of that vs my bigger one on pump fuel and old 800cc injectors,

Since replaced those 800's with 850's and a splash of Ethanol


https://cimg5.ibsrv.net/gimg/www.sco...07d1892cb2.jpg

If I'm reading it right,your vf35 has nice fast spool low down which should be similar to a td05-16g.
Then your bigger turbo @4k rpm shows it a clean pair of heels,even more so now with a splash of meth I bet!

Which turbo you running now? I need some meth in my life I reckon :D

@Linksfahrer
Is yours 100% a genuine td05?

This is the one comparing V-Power to 20% Ethanol


https://cimg1.ibsrv.net/gimg/www.sco...b48c918a6b.jpg

The turbo began life as an SC42

Got damaged

Sent to Owen Developments and got remachined to fit bigger billet wheel, upgraded bearings & internal heatshield,

It's similar to thier M-Spec turbos,

It's fancy name would be an O/D GT3073-HTA-M

Bit of a Frankenturbo, mix of Blouch, Garret & Owen Developments parts.

Plenty for a stock 15+yr old engine


https://cimg1.ibsrv.net/gimg/www.sco...78fdc903dd.jpg

Impressive! That extra torque is amazing with 20% ethanol :eek:

Thinking of having my sc42 redone,it's got a worrying crack where the inlet joins,might just repair the crack tho if it's easy enough to do.

I didn't have the turbo before it got the OD treatment so cant tell how much difference it made,

should flow close to an sc46 id imagine

This brings the old question boost over timing.

Ive tested lower boost but more advanced timing over more boost with less timing, the more boost less timing seemed to give the bum in seat dyno better results, yet alot of people say more advanced timing with less boost gives more power.

blowing hot air rather than actual boost seems to be around 1.4 on my TD05h 16G,running a 2003 TMIC on a 1995 WRX. over this it doesnt seem any better running 1.5 compared to 1.3 or 1.4

I agree totally with these statements.


Simply the kick in pants feel is missing further up, it is as if you can boost as much as you like put its a diminishing return. The timing effect is particularly noticeable when compared using a 98 octane and Aral 102.

Equally this shows in the fuel consumption on high boost on a fast run the tank seems to drain in seconds. If you back off to 0.8-1.0 bar everything seems to settle down and you are still accelerating or doing >120 mph.

I'm not surprised though as a TD05 16G 7cm is simply not in its Graphed most efficient boost v flow area over 1.1 bar . I'm convinced that you can only get the best from this Turbo if you either throw out the cat or at least reduce the back pressure considerably with a high flow cat 3 inch system. It certainly should not be being held back by the WRX heads , these flow very well and probably more so since I smoothed out casting irregularities and lightly ported them.

Are you still using a cat convertor ?

No, its from Taiwan. I think Mickey has the only one left on here ;)

I'm not convinced that its all that bad though
it is capable of raising its game to 2.0 bar.
It did so when my last boost controller went bad :eek:
hence all the rework now.

The first / real question is what's happened to the potential Torque
when its already at 1.0 bar ?

My suspicion is the failed exh gasket during tune
 

https://cimg2.ibsrv.net/gimg/www.sco...6081890f4e.jpg

https://cimg5.ibsrv.net/gimg/www.sco...c3929d3033.jpg
Looks to me that , I have to toss in a high flow Cat and seal
the Turbo - downpipe gasket , then try again :Whatever_

Does ppp not already have high flow sports cat?
Did you fit new gaskets when you put the car back together,you can now confirm the gasket has failed as you would hear and see it?

Yes you can hear it.


No it does not have a high flow cat.


https://impreza.co/wp-content/upload...P-Brochure.pdf


Unfortunately for me only the Sti PPP had that.
Not having one at 4000rpm robs you of 42lb/ft of torque :(


https://impreza.co/wp-content/upload...P-Brochure.pdf


And if anyone has one from the Sti I'm all ears for your offers :p

Ralph, can you not just fit a 3" decat downpipe, and a high flow cat in the centre section? It's a cheaper option, than a sports catted downpipe, most likely.

STI prodrive cats come up regularly on ebay, so should be able to find one in the near future IMO.

You could also fit a normal sports cat down pipe, but I'm not sure what the fit is like... I have a scoobyworld sports cat downpipe (replaces mid section), mated to a miltek exhaust, and I had to cut and weld to get the pipes to mate up (don't know if it was due to the the downpipe or miltek).

Having said that, if you can find a PPP sports cat, I'd personally go for one of them. I've had two over the years and they never gave any problem and fitted perfectly.

I like the idea of cheaper but ... with close to 1,5 bar ?


Will not retaining that Prodrive back box with its 2 1/4inch (57mm) internal diameter leave the flow restriction further down ?

I, and I'm sure others, have run close to 400bhp using a prodrive back box :)

​​​​

Ralph, most 3" decats drop to 2.5 inch to meet the OEM centre section, likewise 3" catbacks usually drop to 2.5" to meet the OEM downpipe. There are very few true 3" inch systems.

Micky , clearly I'm not on the pace here..


You push 330 hp from a TD05 H 16G @ 1 bar ! :notworthy


Despite head improvements, Decat-up,255lph fuel pump,550 injectors
I can't even get close ( I have a "laggy" 312 hp @ 1.4 bar )


Where in your opinion am I going wrong ?

Did you have a dyno run pre-mods? There could be an underlying fault with your engine (low compression for example). Or there could be a fault with the turbo.

The sc turbos have changed alot over the years, housing changes, blade changes, no of blades etc.

Constant development of them makes it difficult to track what's what. I believe the current 46 is a previous 42 that was tweaked and found to out perform the older 46 so replaced it.

Only constant is the name vs bhp, 38 - 380bhp, 42-420bhp etc

They are Blouch turbos.

Scoobyclinic just spec em before ordering which anyone can.

Do you think for one min that they design their own parts or machine them ?

There is no "development" they just chamge the specs

It isn't some magical SC turbo

They like to use a 7cm housing thats it. Blouch usually 8cm or 10cm as more for 2.5.

Dont try tell me for one min that they design or build these.

Blouch do the hard work & constant development.

Unless by SC constant development u mean they ask for a different wheel this time around. Same as anyone could ....

SC just save u the import fees, time & hassle for a cost.

There isnt any difficulty tracking whats what if u stick to the Blouch naming convention.

SC just order a different Blouch but keep name the same...

Not hard to figure out if you put your mind to it.

The name is actually vs Flow too. Just coincedence it similar to achieveable bhp.

Hi , No Dyno run premods , most of these I did in 2014
then roadmap by JGM sadly one of his last.
I killed the last engine 2017 on a fast run in -5°C
the sti pistons expanded faster than the walls and all four
cylinders were badly scuffed.

Underlying fault with Turbo , yes maybe its a Cheapy China one.
I have to consider that with a high oil consumption , 500ml 600mile.
but it still makes >1.5 bar if you let it. So maybe its only
bearing clearance's in it , letting oil into the combustion chamber.

Obviously I can have the compresion tested again , but that's not top
of my list , I have no oil in water. The heads I reworked myself
with new valve seals. The Block has 2000 miles 0,05 overbored
with new pistons. It all sounds a bit loose untill it warms up but the
EJ20 do tend to be plagued as noise makers.

Fact is I have very little bottom end torque, and its been
like that post rebuild and also after the latest map from Duncan.

its rather hard to critic the map based on this , Duncan has
found more power in top end, it actually runs smooth clean as
you would expect over 4k but I can't help feeling that the top end
is astmatic, which has got to be down in some part to the Std
WRX CAT in the downpipe.

My biggest concern is the unexpected lack of torque lower down.
it runs uncomfortably , pull is irregular as if you know it could
be better but either doesn't get the timing/fuel/or chance to
breath right. The MAF is clean, the filter is a new MANN.
The only fault code I have seen was a exhaust high temp on Bank 1
I had that cleared and it has not re-occured.

I'm lost I don't know what to chase, but I am not going to
discuss this futher on Micky's Post ,
He has the best TD05 H 16g figure by a country mile at 1.0 bar

I will go off do some homework and work systematic through it.
and report back on a new post when I have an improvement.

This.

380cfm, 420cfm, etc...

It's difficult to fault find without a baseline. If you managed 280+ on a TD04, then we can assume that everything is working fine and it must be changes you've made after this.

Pretty much everyone fits a sports cat/uprated downpipe/system so that's a given that you should change that. Really no point comparing dyno figures with other cars at this stage.

Look for all the cheap fixes first: vacuum leaks, exhaust leaks, actuator, boost solenoid, fueling etc - although these should really have been picked up during mapping if they were an issue.

If it was me, I'd fit a sports cat and get it remapped. If it's still not behaving properly, I'd get a genuine TD05 or VF35. Or consider a different mapper?

sore subject for you or summit cos you kinda went off on a rant there lol

It's well know they are made by blouch, clinic spec them, test the specs on differn't platforms (2.0, 2.1, 2.5 etc) to see if they work or not. They also try new specs not on the market yet which is why they get revised. But of course you can buy test turbo's on their website can't you. hang on,,,,

at the end of the day you makes your choice you pays yer money.