L&G.scooby

Hi all.
Had MY03STI ppp 3 months now and after reading/searching and learning as much as I can on this very helpful site I have a little niggle.
It has a EcuTek remap with ful 3" turbo back decat exhaust, green panel filter bit no 3 port.
Just wondering why only 323 HP when similar cars make 340 to 350 ish.

Any ideas?

ALi-B

iTrader: (1)

Boost is bit late spooling 4000rpm to hit 1bar doesn't sound right to me

Unless you have a big turbo, I'd say you should be hitting 1bar closer to 3000rpm.

That should really shouldn't affect peak bhp too much, as thats at mucher higher rpm, but it'll make a poor torque curve at lower rpms.

Too many factors and cuases to say what it could be, but it needs investigating IMO.

L.J.F

iTrader: (31)

It's hit or miss when it comes to Vf series turbos, plus it depends what fuel was in the tank at the mapping session? You really need to speak to the mapper to get a better understanding on how the car is running. Normally you should see between 320-340 with the basic mods so you aint really down on power and as long as the car drives smooth and fueling correctly then you nothing to worry about.

L&G.scooby

Car drive just great, making 1.4 to 1.5 on the boost gauge. It's the standard turbo, and I only put v power in but don't know what fuel it was mapped on but pretty sure it would have been v power as it has a great service history with lots spent on it.
I have now got Harvey headers to go on, just need to get a matched up pipe then it's 3 port and a remap so hoping the boost should come in sooner.

ALi-B

iTrader: (1)

Oh hang on, I'm not awake yet - Type uk...thats a VF35 on a 2.0 engine ?

That'll explain some of the lazy spool.

L&G.scooby

Ok, are they known for that?
Will headers and up pipe help this?

ALi-B

iTrader: (1)

Yes. Its a big turbo on a 2.0 engine. Still capeble of big top-end BHP though, it just takes more revs to get it to spin up. Compared to say, a td04 (which in contrst has limited top end power). I still think it should be making 1 bar sooner though.

I mistakenly read your car being a JDM not a UK. The JDM Sti had a twin scroll VF37 or VF36 which is different kettle of fish.

53

iTrader: (41)

325 is sports cat territory, you should be making a little more but it depends on the car, map and the mapper really. Who mapped it

Tidgy

How recent is that graph? date on it says 09?

L&G.scooby

Yes, mapped on the 09/05/09 before I bought the car and mapped at Scoobyworks, but don't know the mapper or who Scoobyworks use?? If I give them a call will they have any info on my car?
Also does not have any cats at all.

Tidgy

Ah righto, i wouldn't get too hung up on it, impreza's are notorious for varying results after mapping. As long as its running safe (dyno run will prove that) then i'd just enjoy it

SirFozzalot

Agreed. Mines got a sports CAT and runs 325.

L&G.scooby

Runs perfect. Thanks all

jd5217

VF35 a big turbo?

Pramas

mine was running 325bhp, turned out to be a bent gasket on the intercooler, boost was escaping. Have you checked for any leaks in the pipework?

L&G.scooby

No, not checked for that.
How would I go about checking for leaks?

ALi-B

iTrader: (1)

It is when compared to a TD04.

But then a VF35 is small when its on a 2.5 engine, the extra CC makes it spool like a TD04

Gear Head

iTrader: (2)

Keep saying that to yourself and forget about the graph.

Cocker

iTrader: (3)

think mine around 320 aswell with sports cat, but it drives perfect and has done since i have owned it. Reliability is more important to me than squeezing another 10bhp and the hassle of decat

Stealth

iTrader: (4)

Graphs from rolling roads are bull **** mate, they give a rough figure of what the car is running... they're not road figures and if she drives well and feels good that is all that counts!

The VF35 is only really capable of running 350bhp tops so you are not that far off it. The map could be uber safe which would bring the figure down slightly, better to have a 325bhp safe car than a 350bhp on the edge car

the hamster

iTrader: (7)

Currently 305bhp with a VF35, sports cat, FMIC, walbro and standard headers/up pipe running VPower

Have had it as high as 336 but my up pipe is leaking plus the map was for my old engine/turbo which have since been replaced.

Hoping to go full up/down de-cat soon + a 3 port to get to 340/340

Scoobyworld

iTrader: (4)

that'll be me

323bhp is a little low, if its a full decat, but was obviously the most we could extract from the car at the time, if there had been an issue (i.e boost, fueling etc) we would have found it and fixed it. We spend long periods on our dyno mapping the cars we have in, so if we could have produced a better figure, we would have.

Its possible the previous owner was running 97ron fuel, or worse, we've plenty of customers who wont use anything more pricey.

Best idea is to pop in and we can have a chat, I keep detailed notes on every car we map, so should be able to look it up. Tweaking the map for headers, 3 port etc shouldnt take too long if you wanted to go that route at some point too (around £100-£150 for map tweak)

We usually achieve 330-340 on a car of your spec (more if headers), but then again every now and then we get a car that simply wont hit those figures, and yet shows no signs of problems either on delta dash, det cans or inspection.

cheers
Neil

Scoobyworld
Scoobyworks

L&G.scooby

Thanks Scoobyworld. I'll give you a ring today.
And thank you for all you replies. I am only a 3 month old scooby owner, and I am not ever getting rid of my blob! I love it. Just wondered why so I asked the question.
Can't wait to get my headers and up pipe on in the new year with 3 port and a tweak map.

jd5217

Why is it fitted as standard then if it is large on a 2ltr? It depends on your expectation. There are enough 2ltrs running GT30 hybrids with no lag issues.