I understand that fueling etc.... is different between japan and the UK but I've carried out a reasonable amount of mods to my UK turbo and it still only reaches 260 on the rollers?

OK, it is running nearly 300 lbs of torque, and it's mapped well within safety (between 1.1 / 1.2 bar) Very happy with how it drives.....

It's just will a UK engine ever push the same as an import?

 

turbo and mapping for fuel are probably the main reasons.

 

get yourself a tdo5 on there and an apexi power fc. should help on the way. 260 out of a uk motor isn't that bad.

does have a lot to do with the fuel ratings though afaik.

eta - just see you already have the power fc. what fuel was it mapped on?

 

AS I said... my car's running sweet. It's just loads of people keep saying "oh uk cars are so slow" and as i work in engine design, I wondered why?

Are any of the internals different or is it just the TD04? So did JDM cars from 97-98 onwards still have TD05s? or is the TD04 a UK only turbo?

I do have an Apexi btw......

 

Cheers Matt...

I'm not 100 % sure should have been Tesco 99... but due the the Fuel Issue it may have been 97..... (99 I think though)

I know for a fact Zak has not maxed the mapping and if I asked him, Im sure he'd tweek the boost.... But I don't want to go down that road....

 

what rollers?

depending on cooling fans they may under-read substantially.

 

i think it was the early jdm cars that had the td05 and all changed to the td04 from 96? sure someone will correct if wrong.

not sure how much difference it would make to your power output.

i think gear ratios were different in the jdm cars as well - shorter. not 100% on that though. i think another thing is that jdm cars are lighter so acceleration will be increased.

i can't see how anyone can say that any turbo impreza is slow. if they were, the insurance group would be lower as well as their desirability.

 

another very good point ambient temps can make a huge difference to your power output reading.

at the end of the day bhp figures don't mean anything. in gear times are more important. how happy you are with the way the car drives is the most important thing.

 

i use tesco 99 as well. from my jdm 94wrx on WRCs rollers i saw 250bhp. that was with full decat and equal length headers. being a 94 it also had the td05 on there. i too was running tesco 99 ron, i always do as it's the easiest sul for me to get. i think optimax or (v-power now) can up the figures according to some tests, but it's being able to get it all the time.

not worth tweeking the boost too far. much better to have an engine that's reliable at the end of the day.

 

The RR session was at Engine Advantages and previously it had run 240 with just a centre decat / backbox and a pnl filter..... Then I uprated the fuel pump regulator, added a Dawes, changed the ECU, fully decatted and had it remapped and that only made 20 bhp more on the same rollers?

As i said, Im very happy with the car... OK I'd like to get to 300BHP but I was suprised that amount to std jap imprezas making nr to 300 when stock?

Can a TD05 really make nearly 100bhp difference?

 

It's not just BHP either though.

Look at all the models available in Japan that we never get. Type R, Type RA, S204, Spec C etc etc.
Britain is a very big market for Subaru in terms of top end Impreza's, and if they imported all the above models in with Manufacturers warranty, they'd have no problems sell them. Hell, I'd have traded in for an S204 straight away.
We don't even get a rear wiper over here.

Edited to say : It's not just Subaru either. Look at Honda with the new Type R. We get a luke warm hatch, while Japan get's the faster models plus the Saloon version.
Other manufacturers are just as guilty.

 

spot on.

although i do have an RA just not a new one

 

Bibo - it may be that your ignition advance multiplier had dropped due to dodgy fuel and that would have recuded ignition advance and thus power or this dropped down due to excessive heat on the dyno -> same effect.

I like to be able to see what the car is doing so use a laptop and OBD lead to log what the engine is doing or if the dyno operator is friendly - sit in the car with them logging whilst they are doing the runs.

 

Cheers guy's I think I might book some time with Zak again and see what happens......

 

quick ? for you Bibo. is that 260bhp at the wheels or the fly?

 

flywheel I would have thought.

What type of dyno was it?

 

not yours with 300lb torque in a light classic

torque for go, BHP figures for show

 

HERE are some listings on the VF Turbo range but as yet we don't have anything for the TD range of Turbo's if anyone has a listing it will be good for the data base

 

I thought it was the wheels? But I'm not sure now... i'm new to all this game, can you tell

OK, that's not bad at flywheel... but I'll check....

Yep, 300 lbs torque is cool!!!!!

 

or this: Subaru Turbo List - Newbies & FAQs - NASIOC

 

if you've got a figure of 260 from zak's remap graph that should be at the wheels.

if it's 260 at the fly you've got a fast car, if it's 260 at the wheels you've got an animal

 

that's just what i was thinking. when frayz lists up what he's got since the latest mods it's always quoted at the wheels. 260 at the wheels will be over 300 at the fly won't it?

 

Brilliant find

 

but Bibo is quoting this from a dyno/rolling road. They will normally quote flywheel figures and depending on what dyno it is there may be an element of doubt over it

 

ah i see.

taken from Engine Advantages site:

The Company is equiped with a Hofmann Dynatest 112, which is a 2 and 4 wheel drive rolling road capable of speeds up to 150mph and 535bhp per axel.
The rolling road incorporates data analysis and logging software to ensure the optimum mapping for all driving conditions. One major advantage of the rolling road is that it enables the engine to be mapped in-car, which is difficult to achieve on the open road

 

Checked another persons printout from the day as mines at home

Yet, I'm 100% sure the Terzo's running 260bhp at flywheel....

 

It is flywheel figures then

Dont know much about their rollers from first hand experience, but dont read too much into them - its how it drives on the road that is most important. Zak will never chase headline figures as it is all about the area under the curves.

Mine has 356bhp & 402lb/ft according to the dyno but the real kick is because it has over 300 lb/ft torque from 2500rpm right up to redline - that makes for rapid progress in my book

I am guessing that your torque curve is the one that Zak has concentrated on - compare the shape of that curve with anyone else running 260bhp, or much higher even, and you will see why yours is quicker.

Torque rules

 

Cheers DM

I'm still interested if anyone knows the difference in Europe/JDM specs.....?

 

Why does every one have an obsession with big BHP? It does not always mean you have a faster car,
How many people on here actually know what BHP is, What is it a measurement of? How is it calculated?

 

The funny thing is that if your car is on a rolling road (as mine was yesterday), the bhp is calculated from the torque figure based on engine revs - in other words it is torque that the RR is in fact measuring. Yup - low down torque is the way to go. On a UK WRX like mine, that means a TD04 Hybrid (like mine )or a VF35.