suffolkdar

I think this is a valid question and await some interesting debate about this, I have a 2.0 sti ppp that has been remapped giving 330/330 on the rollers, I also have a Mitsi GTO 3.0 twin turbo which was dyno'd @ 320/355 a few years ago, It is at the moment under going some tlc and hopefully it might see some miles by the end of the summer, Both very fast cars, but both very different, the scooby is great all round and I love it to bits,The engine revs sweetly and I akien like riding a two stroke motorbike, keep it in the power band and it flys,This to me has always been Impreza turbo driving, Today I took out an 06 reg 2.5 Sti with ppp, It was good fun and it is still a great car!, I did however find it pulled through the rev range much more but had a reluctance to reach the higher revs, Much like my GTO, Less of a racer and more of a cruiser!, To me today I was dissapointed as i walked away for the 06 sti, not because it was a crap car, far from it, it just didn't deliver the "Impreza" driving experience I expected.

Rob2101

with the 2.5 as most people will know that they have lowered the revs down to 6 1/2 from 7 due to the engine having more torque than the 2.0.

It might of felt like the car had the reluctance to get to the high revs
but it would of got to the speed just as quick as and plus having a bigger engine it has smoother power delivery.

bluenosewrx

iTrader: (2)

Seems like a valid point there mate!!, i have no experience from The 2.5 so cant really add anything to the party.

I am due to get a MY04 Spec C ltd and am expecting some good things from it,i have chosen this over a 06 STi as its a car i have alwys wanted,hope i am not dissapointed.

Mac

Rob2101

I can't comment on the spec C as i have never been in one or have driven
one.
But i would like to know if anyone has one and what they think of the 2.5.

I would of liked them to have done the blobeye in the 2.5 then might of thought about swopping my bugeye for one

ex-webby

You could have the best of both worlds and stick a 2.5 in to a Spec C.

Mine rev's the same as my old JAP 2ltr Twin Scroll did.

Rob2101

there is that

Snazy

Looking forward to the difference a bit for next weekend. Will be interesting to see how different the drive is.
Not usually one for driving too hard, but have hit almost 7k a few times.
Didnt know the 2.5 was a slightly less revvy engine, but guess I will discover this also next weekend.

hallsy67

ive only had my 2.5 a week but seems to rev freely to me must admit though didnt drive a 2.0 version but my brother had a 2000 model from new and when he drove mine said the low down torque was totally different

cster

I've got a big dick, so of course I prefer a car with a smaller engine.
As my mum used to say-"there's no substitute for cubic inches!"
Come to think of it, that is a funny way to measure c*ck sizes.

Terminator X

iTrader: (7)

You won't be, it's awesome

TX.

gDallasK

I've been thinking about changing for a while now but the last few examples of the current model are coming through to dealers now so I had to act. I tried out a 2.5 WRX last weekend and was very surprised how much better it delivered power at low revs. The difference in torque is very noticeable. It feels completely different and I was quite happy to save the cost (and higher insurance premium) of the PPP.

I'll be picking up my new Urban Grey saloon (once they've swapped my beloved Momo steering wheel and stereo from the old car) on Sunday.

Can't wait ........

pdm

I bought a 2.5 WRX but found it used to "stutter" at low revs - there was a defininte flat spot.

After though that it picked up very well.

I've since had PPP added to it and the difference is amazing - no stutter and it pulls like a train whatever the revs. I don't now get a pause and then a rush of power.

In fact it's better to leave in a higher gear than change down.

I am not sure that its massively faster than it was when I got it but its the way the power is delivered is much better now.

RobinSherwood

Hi there,

I've got a 06 Sti Spec D which replaced a (stolen) WR1.

I originally tried a 2.5 Sti with PPP but that was disappointing and I doubt it was any better than the WR1, so my car has a Milltek exhaust and has been remapped to 340bhp and 350 lb/ft and I certainly have no complaints with the way it revs. With these mods there is no perceptible difference between the way the WR1 and the 2.5 Sti revs. It has taken a couple of attempts to get the car mapped so that I am happy with it, but it can't be too bad as the car did a 13.01 standing 1/4 at Elvington and finished 13th overall in the Handling shootout.

Robin

automodellistagt

i love lamp

dynamix

iTrader: (3)

2.5 is the future - torque is the name of the game

Mine is a baby compared to Webbie's but the overall driveability and rapid progress in the 2.5 when properly mapped is stunning whether on the road or on the track.

Shark Man

The 2.5 does get unfair bais against it. As what Suffolk says, the original 2.0 turbo lumps (e.g a 1994 Turbo) were akin to 2strokes - on or off, and when below the powerband had awful power output. They were just too reliant on the turbo to be spinning to make any decent progress.

This IMO, on a car is annoying, a flaw. You can get away with it on motorbikes beacuse of the lack of weight...but on heavy car, its not my idea of the characteristics of a "driver's car".

Later 2.0turbos have much better powerspread over the rev range (re: twin scroll) and the 2.5 is just another way at giving more power at lower revs whilst still maining a decent peak output. All in all, the 2.5 is more flexible to different driving scienarios.

Sure the kick in the back isn't as prominent, but remember that "kick" is because the engine was producing very little power before the turbo started working.

pjhsid

The experience of 2.5 litre engines extends to just RB320s, but they knock spots off PPP'd RB5s and MY99/MY00 2 litre jobbies.

Just so much power delivery thru out the rev range. The word to describe the acceleration in the 2.5 PPP is RELENTLESS.

ex-webby

2.5's are very driveable as already mentioned and as a road engine, certainly seem to be the best bet.

I must admit I did drive a 2.5l (modified and converted from a 2l) Scoob last year (not sure what spec the engine was internal wise), but I am over the moon with the fact that my set-up still revs to over 8k, with peak power at the same point as it was on my 2l twin scroll.

I had the understanding that standard 2.5's (engine wise not mapping wise) were a bit flat at the top end with power dropping fairly rapidly, but the fact that power / torque was seen sooner circumvented this.

Any comments?

ScoobyWeb

Mmmm, Not sure what you mean here but my 2.5 STI redlines at 7k, the previous 2ltr uk/euro models redlined at 7250. I love the way mine drives, no flat spots, pulls strong, especially from around 2800 to 6500, beyond this it just flattens out. But as said before, some small mods and the right remap and these things are a different beast.


Chris.

MrRA

Shaun did you spec the optional billet crank in your setup?

dynamix

iTrader: (3)

The rev limit set in the OE map is 6900 - it is really not worth going near that though with the power band.

Rob2101

i was going off what i had seen in regards to the revs, i had a look at one in robinsons and the red line mark was at 6 1/2k so i asked him why have they lowered it.

suffolkdar

Maybe my first post was a bit long winded, The point I was making was that the 2.5 drove much more like my 3.0 twin turbo GTO, Lots of low down grunt, This is not a bad thing, It just didn't feel like driving an Impreza as I'm used too.

BeeSTi

Simple answer, Shorter rods and longer pistons 2.5 then reves like a 2.0 liter


Having driven the 2.5 ppp sti I now own a JDM 2.0 STi

ex-webby

MrRa,

Yes.

ScoobyWeb

Still not sure what you mean as my redline mark is 7k, as is every other one I have seen. As Dynamix has previously posted the rev limiter cuts in at around 6.9. I have my rev beeper set at 6.4 but rarely hit it as there is no need to rev it past that. Are you sure it wasn't the WRX that you saw at the dealers (not sure what the redline is on a WRX as I have no personal experience of them.


Chris.

MrRA

I guessed you had from your comment about your 2.5 revving so high. Fair play, you've gone all out on your setup.

ex-webby

MrRa,
Full details in the up and coming Stage 3 Engine Modification article. Trouble is, I am already looking at and discussing possibilities for Stage 4!

MrRA

Looking forward to it.

When will it end?

ex-webby

When the Mrs checks the bank balance!