SmurfyBhoy

NOt that bad realy heres my SC42 hat had been fitted to my Blob STI

On-the-bog

Ah just re-read it, thought it was on a 2.5.

SmurfyBhoy

I think that last graph was on a 2.5 actually so yea i thought a 2.5 would wake it up earlier,

sorry mate it's me who can't read

Ste333

iTrader: (3)

well it is a 25G I suppose interesting to see the numbers though

boosted

add my bit here, I have a cheap Chinese eBay 20g that was £125 band new with 1 year warranty.
Must be doing the business as my full weight newage (1500kg with driver) does consistent 12.3's with it, so circa 380hp.
I love all the tubro snobbery

On-the-bog

ah i re-re-read and yeah rb5 with s forged 2.5 hahaha.

So statement stands, I'd expect it to be 1000 rpm earlier to full torque so very very laggy

On-the-bog

It's nothing to do with snobbery at all, its to do with best results of spool vs power.

SmurfyBhoy

Agree,

Would've been acceptable had it been on a 2.0 would expect over 400 ft/lbs from a built 2.5,

SmurfyBhoy

Can we see a graph for this cheapo turbo

or is it a guestimate ?

If it's doing those times who cares what brand it is

On-the-bog

For comparison, all pulling considerably more power and spool

https://www.scoobynet.com/799025-sco...l#post10499895

post 3554

even outspooled by a 2.0

https://www.scoobynet.com/799025-sco...etter-126.html

post 3761

boosted

Full boost 1.6 bar by 2800rpm, 1.5 bar held to 6500+
It's does 12.3's, 379bhp is the power required to do those times with 1500kg. That's more accurate than a rolling road. Power isn't important, the speed of the car is what matters

On-the-bog

Maybe yours is (got a dyno graph for comparison, spool is typically later on a dyno). But every turbo performs differently on different cars not to mention you may have got one that is decent.

I shall explain, cheap knockoffs tend to have much larger tolerances, however that doesn't mean 1 in 1000 can't be a good match and tolerances be very tight, so it performs ok.

boosted

Tolerance of which part?
I have had four engines and Seven tubros on my Impreza in 3 years, this is the fastest.
I have owned and ran 8 cheap Chinese turbos over the years all with good results (from escorts, sierras, BMW, golf, two impreza's) also ran genuine garretts, holsets and mhi tubros.

scooby2.5maz

iTrader: (16)

He obviously hasn't driven enough . He also needs to realise it's on stock wrx heads , non avcs . Also it ain't a £1500 turbo but £500 turbo

SmurfyBhoy

Is there any proof of this ?

Full boost on a 2.0 by 2800rpm ?

or is it a 2.5 ?

Be nice to see a graph to compare

Ste333

iTrader: (3)

That's very specific...how do you come to that calculation? Not taking the ****, just generally out of interest

boosted

2.5 9:1 compression. Proof of what?

boosted

Torqstats never lies.....

SmurfyBhoy

Proof of the power the spool any of these claims lol ?

Not doubting just always good to see a timeslip/dyno graph/datalog ?

So its a fully forged higher compression 2.5 ?

SmurfyBhoy

Those apps are bull**** tbh,

What about transmission losses and the thousands of other variables ?

Id say give or take 10%

boosted

Yeah, 2.5 with wrx heads, 8.9:1 compression and a 7cm cast 20g.

On-the-bog

uh target calculator says 417bhp, its only when you put it in the calculated time (1500kg and 379bhp) is says 12.3.

SmurfyBhoy

**** me did you do those times at Crail ?

boosted

Are they really?! What about said descepencies with a RR? It's all relative and all educated guesswork.
However the weight and times don't lie....

boosted

Yep, best bit is I mapped the car myself with a megasquirt

boosted

Use dragstrip time not 1/4 mile

On-the-bog

in this case there's no benchmark times to compare the turbo's, hence the dyno benchmark, which while are slightly varying, decent dyno's typicly show results very similar.

Also were talking about spool here anyway so dyno would be the like for like.

SmurfyBhoy

I thought a fully loaded newage oiled and fueled was closer to 1600kg,

SmurfyBhoy

Prob go even quicker elsewhere,

I suspect you have a fair chunk of torque to go with "only" 380 ish bhp,

Guessing well over 400Ftlbs 420 ish even

boosted

Of course dyno spool is BS anyway... road is where it counts.
I had a genuine evo3 big 16g on my 2.0l before the 2.5, it spooled about 3800 and couldn't hold boost up the top...
20g was spooling at 2800 and dropping like a stone too until I discovered an inlet pipe restriction... now it holds boost all the way. Can only assume this was the problem with the previous setup too. My point being let's not be too quick to blame the tubro. Chinese or not.