I've heard that MY98 drivers have reached 150mph whilst I couldn't exceed 135mph any comments ??

 

It takes a very long piece of road to get it up to anywhere near it's top speed. If there was a 10 mph headwind, then this would knock 10mph off your speed for starters.

Subaru claim 144 mph, but most tests have shown about 140 - 143 mph. However, with a speedo which is a few % optimistic, then an indicated 150mph + should be no problem.

Unfortunately, you need to travel overseas to verify this, as there isn't a track in the UK (apart from Millbrook and other testing tracks) where you can get much over 110 - 120mph on the straights.

 

At Goodwood in my STi V TYpe R I was hitting just short of 140mph on the back straight, coupled with the rev counter reading I have little doubt this was reasonably accurate and within a couple of mph, and I was still accelerating. Will be interesting to see what i hit (speed wise) at Donnington this weekend.

 

Robbie, from what a lot of other people have said i doubt you would see 140 at Donington, maybe 130 on a couple of bits, but that is on a very good day.

 

Allan, I live in Holland and sometimes go to Switserland via Germany ,so I have some data.In kms my 98 car runs 260 ,I believe that's about 160 mph.Untill 250 kms things go very easy,for the last 10 kms the conditions must be good.Also other dutch owners(even my dealer with his demo car)claim the car runs out of reach of the speedo(260+),most of them standard cars.So you guys in the UK have got the hot (STI) versions,we have the roads nearby to make the engines sing.

 

Chrisd, thanks for your reply, with my MY98 I noticed that the acceleration is fairly good up to 125mph (210kph). Then
the acceleration drops rapidly so that it takes forever to reach 135mph (230kph).
I have a standard unmodified scooby running on 98 unleaded. 160mph seems legendary so what is the secret ???

 

Hello guys.

I believe speaking about what you read on on your speed pointer do not tell you anything on your real speed. 2 same cars could be at the same speed with a gap of 20 KM/H on the board.

Maybe it's better to talk about rpm in 5th gear. I believe that previous scooby with 15 inch wheels are at 6000rpm at max speed (230 KPH). Of course if you have not the original wheels it's not the same thing.
Me I got 6800rpm with 17 inch wheels (of course it's a modified MY94)

bye..

 

Allan,I drive a my 98,K&N panel filter,no cats,laser backbox and piggybag module which increases turbopressure with0,2 bar.Also run on 98 ron and with resetted ECU.I have the standard wheels and tyres,though that makes no difference,15,16 or17 inch wheels,the tota height remaines unchanged .

 

Hi Chrisd,
Whilst it's very close,changing wheels/tyres
can have an effect on your speedo reading.
I have a STi4,and changed from 205/50/16 to
17's.The closest tyre fit is 205/45/17,but even these have a different rolling radius to
standard.I actually ended up going for SO2's,
and these were different again.They are about
3% down on rolling radius! yes I know it's
not much,so I'm reading about 3% over + however much the clock is out in the first place.I've so far managed 7700rpm in top,I'm
hoping to hit the magic 7800rpm,but I know
the mph will be out by about 10%(nuts)
By the way,I'd love to know what board you
went for,and what gain you got?
Mark.A

 

Hello Chrisd
I can confirm your speed. I'm driving a MY98 as well with no modifications on original 16" tyres.The acceleration goes very quick until 250 km/h, then it slows down until 255. Maximum Speed I've reached (3persones,tank half fueled) was 255 as well, but it felt like there was a speed limiter stopping the acceleration.
Last week I've spoken to the general importer of Superchips/UK in Germany for an ECU upgrade and he told me that also the speed limitation will be cancelled with the installation of the new chip!?(max 250.hm/h) Does anyone know something about this in regard to Superchips?
Hope you'll understand my humbling english:-)

 

fmimpreza,

I've had a Superchips conversion and notice a steady power surge from 4500 revs all the way to the red line (and beyond to 7500 - as far as I dare take it on the odd occasion) in each gear giving me a good 10mph more in each gear as opposed to the pre-converted car (no-one can argue with this as I know what my car did before and what it does now OK ). Have certainly had it off the clock on one occasion at around 6300 revs but this probably means my clock needs checking so I don't want to start a great debate on this point please. I am very pleased with the superchip conversion but would point out that overboost limits on the OE ECU are taken out and replaced by a manual blow off valve so I had to get vacuum hoses upgraded to cope (plus I had an embarassing moment when zipping past someone on the motorway when my turbo pipe blew its hoseclip and the engine cut out at 85 in the fast lane!). If you're considering it then uprate your hoses.

 

Thanks Dobbo,

I will catch a eye on the clips.
What's your maximum boost output with the manual blow off valve? Does not the additional fitted valve confuses (?) the original blow-off-valve enough to prevent an engine cut out?

 

I've just bought a MY95 (I'm obviously not as rich as the average member)
Can anyone tell me what the speed per 1000rpm is in each gear with standard 15" wheels ( said I was skint, can't afford bigger ones!)
I've managed to get on the rev limiter in 4th showing a shade under 140mph, and it still appeared to pull quite well when I changed into 5th, showing over 145mph until other traffic arriving V V fast in the windscreen advised me that discretion is the better part of valour and I cruised back down to 80ish. It felt as though it would go much quicker if I'd kept my foot down, but maybe it's my speedo reading a fair bit out.

 

I've had an indicated 150mph when the rev limiter cut in. that was on a flat road on a relatively still day. 17" wheels, standard exhaust & Magnex back box, Hks filter. No idea what speed that really is?

 

I've been on the BBS previously about a 155mph max,it didn't go down well with other owners who dont want a boy racer image associated with the impreza(and i can't disagree with that).Anyway i didn't see how much rpm i was showing as the road was being consumed rather rapidly,and i'm afraid concentration was of the utmost importance.I have however experimented in 4th gear and the max in 4th @7000rpm is 132mph pulling quite strongly to 125mph, i have been caught out by lesser powered cars when i'm cruising at about 80ish in 5th off boost,but if i'm on the ball and drop to 4th gear it usually does the trick and they soon stop tailgating me(which really pisses me off).
My car is a MY98 the max was when standard,but now it has had the P.C "treatment"and revs more freely it might be better, but as for max speed it is pretty hairy on UK roads.

[This message has been edited by TC (edited 18-04-99).]

 

The acceleration from 130mph onwards is pretty crap is there a simple way of improving this? on the evolution I've heard it's much better.

 

I just had a run in my MY97 stock just removed the catalitic. I noticed that you can use 4th gear up to 215kmh then shift it to 5th when you get to 7100 rpm . Yes it was slow to pick up it dropped at 4500 rpm and slowly creeped to 230 kmh around 5500 rpm then it picked up quickly to 250 kmh when I reached 6500 rpm . I did this with one passanger (watching the revs ,speed and boost gauge boosting at .95 bar) . I belive you have to redline it up to 7500 rpm on 4th before shifting to 5th since the ratio of 5th gear seems to be far from 4th.

 

The problem with acceleration at high speed is due to the Scooby being shaped like a brick! You're either going to need shed loads of power or improve the aerodynamics to make it go any faster. Neither of which would really be worth it IMHO.