My St205 Seems Faster Than I Thought...

[adamgt]

I knew my GT4 had some mods when i brought it but now im not sure exactly whats been done...

I know somehow the boost is increased to 1.1bar with no sign of boost controller, (my mate thinks the ecu has been remapped to run 1.1) has exhaust and induction kit.

The reason i wonder is because i have raced 2 genuine Impreza STI's and beat them both! One of them is a special edition light weight model with adjustable drive (4x4, rear wheel or front). And the other one is a Pro drive with 305bhp standard.

Is it possible that i am beating these cars just with an exhaust, induction kit and increased boost? Or is there definately more been done?

I cant find from previous owner as it is an import and i am 1st UK owner

[mikeb]

Maybe the scoobies just have crap drivers? ;)

[Leeky]

Scoobies are quicker 0-60 usually but the gearing on the st205 is more for up higher in the range.

Get a scooby and an st205 side by side doing 30 or 60 and then if they both floor it the celica will get out in front.

They have a much better 2nd and 3rd ratio. Where as the scooby has a very very quick 1st gear.

[adamgt]

Maybe the scoobies just have crap drivers?  ;)

←

Nah, they can drive, i know them both.

[dawesy]

you will have a boost controler somewhere if its running 1.1 bar it may bee a bleed/releif valve hidden down by the tubby.

310-320bhp is possible with just an induction kit, exhaust and boost increase to 1.1so it is possible to beat the scoobies.

if you want a health check on it (and to find out what goodies its got, the man to call is ian smith at the toyauto centre (0115 9787855) he knows just about all there is to know about GT4's

[chris202]

Maybe the scoobies just have crap drivers?  ;)

←

Nah, they can drive, i know them both.

←

Maybe you just have jedi reactions :o and can drive like a demon !!

[Sketchy]

hey mate,

I've been thinking about your higher boost since the last post you put up about it, unless in has a aftermarket ecu it isn't remapped as this can't be done to the standard toyota ecu, the ecu is under the center console pull the carpet back in the passenger footwell and you should be able to see it. check for toyota markings.

Also check to see if it has any piggy back controllers attached to it.

We deduced that it definately didn't have a boost controller in the last post however I was chatting to some of the guys on the GT4OC at a rolling road day last month about it, and one of them suggested that a previous owner might have ported the VSV, i.e. made the hole in it bigger so that it bleeds off more air and hence get higer boost.

Another suggestion was that you might have a hybrid ct turbo as these tend to come with uprated actuators which increase the standard boost. You can check the actuator boost level by disabling the VSV and leave the turbo pressure pipe connected to the actuator. If it's standard you should see about 0.7bar.

As for power levels your mods and 1.1bar sound see you around the 300-320BHP region on a ST205, and as has been said above athough the scooby has a better start than the gt4 due to lower weight , lower first gear and better standard clutch for lanching once rolling the four tends to have the edge even in standard form.

[GTForbes]

Another suggestion was that you might have a hybrid ct turbo as these tend to come with uprated actuators which increase the standard boost. You can check the actuator boost level by disabling the VSV and leave the turbo pressure pipe connected to the actuator. If it's standard you should see about 0.7bar.

←

tewchnically if it has an uprated actuator then it wouldn't have the VSV active at all as uprated actators dont have the second line that runs back to the VSV.

[mikeb]

I know somehow the boost is increased to 1.1bar

←

Do you actually know that it is boosting to 1.1 bar (e.g. measured with a calibrated gauge), or are you just speculating?

[adamgt]

I know somehow the boost is increased to 1.1bar

←

Do you actually know that it is boosting to 1.1 bar (e.g. measured with a calibrated gauge), or are you just speculating?

←

I have defi boost guage and control unit which is meant to be extremely accurate.

[daktari]

Tis extremely likely you have a boost controller, either manual or electronic. Check the vacuum pipes coming off the wastegate actuator and follow them to their conclusion.

[adamgt]

Tis extremely likely you have a boost controller, either manual or electronic. Check the vacuum pipes coming off the wastegate actuator and follow them to their conclusion. 

←

Already checked and there is nothing

[adamgt]

hey mate,

I've been thinking about your higher boost since the last post you put up about it, unless in has a aftermarket ecu it isn't remapped as this can't be done to the standard toyota ecu, the ecu is under the center console pull the carpet back in the passenger footwell and you should be able to see it. check for toyota markings.

Also check to see if it has any piggy back controllers attached to it.

←

Hi

Thanks for your reply again, i have looked at the ECU and cant see any Toyota markings, although it is hard to see it properly. I could only see a sticker that had '7-616' on it. Does that help at all?

[Sketchy]

hey mate,

I've been thinking about your higher boost since the last post you put up about it, unless in has a aftermarket ecu it isn't remapped as this can't be done to the standard toyota ecu, the ecu is under the center console pull the carpet back in the passenger footwell and you should be able to see it. check for toyota markings.

Also check to see if it has any piggy back controllers attached to it.

←

Hi

Thanks for your reply again, i have looked at the ECU and cant see any Toyota markings, although it is hard to see it properly. I could only see a sticker that had '7-616' on it. Does that help at all?

←

Sounds like it might be an aftermarket one then, I know for a fact that the Apexi PowerFC for the 205 can adjust boost levels with the standard VSV up to about 1.5Bar but you wouldn't really want to be doing that without an uprated turbo as the stock CT would be well out of it's effiency range and acting more like a hair dryer than a turbo. I have to check mine again as I can't remember what other markings the toyota one has. I'll get back to ya. :D

[Sketchy]

Another suggestion was that you might have a hybrid ct turbo as these tend to come with uprated actuators which increase the standard boost. You can check the actuator boost level by disabling the VSV and leave the turbo pressure pipe connected to the actuator. If it's standard you should see about 0.7bar.

←

tewchnically if it has an uprated actuator then it wouldn't have the VSV active at all as uprated actators dont have the second line that runs back to the VSV.

←

Their uprated not replacement ones which still have the toyota due port design. Not like the replacement one which only have one. I.e. like the normal ones just with an uprated/stronger spring hence higher boost.

[adamgt]

I have to check mine again as I can't remember what other markings the toyota one has. I'll get back to ya. :D

←

Thanks mate

[Bibbs]

Drive it to Reading .. us local guys will have a look.

And don't worry about the scoobies .. I toasted a STI the other week in the rain in my stock s2000 (247bhp) .. They aint 'quick' by a long shot.

[adamgt]

Drive it to Reading .. us local guys will have a look.

And don't worry about the scoobies .. I toasted a STI the other week in the rain in my stock s2000 (247bhp) .. They aint 'quick' by a long shot.

←

A standard 0-60 time of 4.6 or 4.7 is quick to me <_<

[Bibbs]

Drive it to Reading .. us local guys will have a look.

And don't worry about the scoobies .. I toasted a STI the other week in the rain in my stock s2000 (247bhp) .. They aint 'quick' by a long shot.

←

A standard 0-60 time of 4.6 or 4.7 is quick to me <_<

←

Yeah, but if they DO get those times the clutch lasts about 3 launches.

and you have to be a 'god' driver to match any 0-60 times. And no, not on the speedo .. as we all know that lies.

The GT4 and MR2 have good 0-60's, but rubbish 0-62's .. as the limiter comes in about 61 I'd heard ..

[adamgt]

Yeah, but if they DO get those times the clutch lasts about 3 launches.

and you have to be a 'god' driver to match any 0-60 times. And no, not on the speedo .. as we all know that lies.

The GT4 and MR2 have good 0-60's, but rubbish 0-62's .. as the limiter comes in about 61 I'd heard ..

←

I know you have to be a good driver tho get these times but when i talk about 0-60 im really just judging the cars performace what its capable of.

as for the limiter at 61... ive never felt my car slow down at that speed. Mine contiues to pull hard even when ive gone off the speedo. B)

[sotal]

I think he meant that 61 hit the rev limiter in that gear, if you need to change gear more often it obviously causes a bit of a slow down

[adamgt]

I think he meant that 61 hit the rev limiter in that gear, if you need to change gear more often it obviously causes a bit of a slow down

←

Makes more sense. I thought it sounded a bit wierd

[Bibbs]

yeah sorry .. I think that's the limit in 2nd ..

changing gear obviously adds a lot of time to 0-60 runs ..

[Leeky]

Yeah scoobys are geared for 0-62 where as the celica's ratios are more for rolling acceleration.

Like i said before on another thread, get a scooby and an st205 side by side at 30 and when they both put the power down the celica will get out infront.

[*rollaboy]

a mate of mine recently imported one of those sti 2 door imprezas. it was modified ie: boost turned up (it may have been a hybrid turbo) but my point is.... the accelaration was genuinely scary.ive never fely such power (and ive been in some powerful cars). he got the boost turned down to .8 bar after 2 weeks. the back end kept on going a.w.o.l. even with the torque split set to 50/50.