Toyota Yaris GR4 4x4 Rally going into production.....

That depends on the intake routing and pipework. The intake elbow on my MPS pancakes before entering the turbo. Replacing that with a better aftermarket item made a nice difference to the driveability and turbo spool.

So while the actual airbox might be the most efficient, you may see some quality improvements from airbox to turbo depending on how it was designed by Toyota.
 
Over on the GRY forum was a link to interesting report on tuning boxes, basically they are just upping the boost, then letting the ECU (hopefully) compensate. So there is no "mapping going on" seem to me bit like putting a heavier spring on waste gate valve. Plus the "improvement" is minor. Seems a pointless waste of a warranty, better wait for proper remaps when they crack the ECU if more power is the ambition.
Fensport posted some sound advise on the testing they are doing. https://gr-yaris.co.uk/forum/threads/tdi-tuning-crtd4-tuning-box.1330/
 
9designs2 said:
Over on the GRY forum was a link to interesting report on tuning boxes, basically they are just upping the boost, then letting the ECU (hopefully) compensate. So there is no "mapping going on" seem to me bit like putting a heavier spring on waste gate valve. Plus the "improvement" is minor. Seems a pointless waste of a warranty, better wait for proper remaps when they crack the ECU if more power is the ambition.
Fensport posted some sound advise on the testing they are doing. https://gr-yaris.co.uk/forum/threads/tdi-tuning-crtd4-tuning-box.1330/
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Indeed, they essentially clamp/modify signals from MAP/Pre-throttle boost and MAF sensors to fool the ECU into driving the ECU harder, then do the same to the Fuel Rail pressure sensor to trick the ECU into delivering more fuel.

It isn't the worst of ideas as the boost and fuel are taken care of, and the ignition is also artificially bumped a small amount too due to the ECU thinking there is less load. There's generally some left on the table there by OEMs and modern ECUs have intelligent enough knock control strategies that you're not going to blow a hole into a piston with det
 
Tuning boxes can only do so much, everyone knows that. But for many it's the only viable option for added power without risking warranty issues. When the ECU is cracked it'll be very interesting to see!

Btw... I'm just interested in the platform and how it is progressing, I'm not affiliated in any way with DTUK or RS Fabrications. I'm just friends with the guy who is :D So I've just been around to grab a few videos during testing plus obviously had the opportunity to drive the car with the mods too.
 
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ScoobyDoo69 said:
Tuning boxes can only do so much, everyone knows that. But for many it's the only viable option for added power without risking warranty issues. When the ECU is cracked it'll be very interesting to see!

Btw... I'm just interested in the platform and how it is progressing, I'm not affiliated in anyway with DTUK or RS Fabrications. I'm just friends with the guy who is :D So I've just been around to grab a few videos during testing plus obviously had the opportunity to drive the car with the mods too.
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I like the exhaust... they are only 30 mins down the A5 from me :)
 
Not gonna post pictures for now, but you can see what I have posted in show us your car.

But having had the car a couple of days, I have not gone crazy in it due to running it in but some things I can highlight from my short ownership:

Suspension: Coming from an Abarth Competizione the GR Yaris Circuit Pack rides vastly superior, damping is fantastic, so even though its firm it is quite comfy. Maybe the only weakness is over uneven ground it can get a little unsettled but as a total package the suspension seems excellent and of very high quality.
Engine: Seems a lot more potent than test car, still not gone full throttle, maybe that is due to been 2 up versus 3 up, or the fact Toyota put 99 Momentum in the car for delivery and I've since put Vpower in, so 100kg less and maybe test car was running rubbish fuel, plus the air temp is maybe cooler, but I cannot remember how warm or cold it was on my test drive. What I am so impressed by is this little engine has get up and go from very low RPM, it is responsive across the entire rev range, but of course it really does seem to come on song about 3500rpm, but if your in a high gear at 2000rpm and put your foot down, the car picks up. Not redlined mine yet but I've held it at partial throttle to 6000rpm and it gets there with no delay, the test car pulled eager to 7000rpm. The engine on paper should be pretty rubbish, but it drives nothing like a 3cy 1.6 turbo if feels more akin to something bigger. I love the internal noise, so I think exhaust wise I am staying stock unless one comes out that unleashes big power gains, otherwise maybe it just makes sense to look at stuff like downpipe, cats and OPF delete if they yield decent gains, but I need more seat time because right now it seems very adequate, but maybe its just a case of the white cars are the fastest and of course the low kerb weight will be greatly helping with response from the engine.

That is it, averaging 25mpg at present, which I feel is good as I've been on country roads and town driving, no sustained cruising due to running in.

Toyota delivered the car on 38psi all round also, so do check your tyre pressures, dropped them to 32/29 this morning which according to door jam is correct, also disabled the keyless entry as well. :)
 
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Thats how the gt86 suspension is. Over very rough surfaces it also feels loose. The springs are soft but the shocks are hard I think (which is how it should be on sports cars, many get it backwards). The Lotus is the same only pulled off flawlessly.
 
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Nasher said:
Thats how the gt86 suspension is. Over very rough surfaces it also feels loose. The springs are soft but the shocks are hard I think (which is how it should be on sports cars, many get it backwards). The Lotus is the same only pulled off flawlessly.
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That's a big problem with Jap cars in general. Especially performance ones. Our roads are very unique in their bumpiness/cambers due to being so old in their origins. If you have ever been to Japan and seen their roads it makes total sense to make cars like they do.

I am going back a few years but I remember being in an Impreza P1 (Prodive did the suspension for uk roads) and it rode just so much better than the normal V3/4 imports that were around at the time.
 
Nasher said:
Thats how the gt86 suspension is. Over very rough surfaces it also feels loose. The springs are soft but the shocks are hard I think (which is how it should be on sports cars, many get it backwards). The Lotus is the same only pulled off flawlessly.
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Yeah I am quite happy with it, could argue because I was used to the Abarth which felt like it had no springs, but I am also coming from an S2000 which has Ohlins and the Yaris has a similar feeling of quality damping, so though I am sure the Nitrons offer an improvement, I just don't see the factory suspension as a weakness and feel the need to further improve it and I am happy with factory ride height, it is nice to have some ground clearance. :)
 
Still cant get excited about this car but i admit not driven one. 25mpg on a light 1,6 3 cylinder thats being run in sounds pretty crap to be honest, but i guess its relative :D

Obviously white cars are the fastest
 
Simon said:
Still cant get excited about this car but i admit not driven one. 25mpg on a light 1,6 3 cylinder thats being run in sounds pretty crap to be honest, but i guess its relative :D

Obviously white cars are the fastest
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Well new engine, people with a few thousand miles on them are returning close to 50mpg on long journeys when sitting at sustained speeds.

Ive been making sure to take country roads wherever possible and constantly changing gear and using the rev range to run it best way I think I can so 25mpg is good to me considering the driving it’s been doing, same in M5 be 10mpg :D

But I get lack of excitement thing we just need a small hot hatch and this is the best to be honest I nearly did not bother with one as did not want 35k leaving my bank but as Toyota offered interest free and the fact they are easy to flip for a profit I thought let’s go for it and I’m glad I did as it’s a seriously good bit of kit, though on a hot Summers day I’ll still be taking the S2000 out it might be slow but that car just feels so right. Surprised you seem to dislike your so much.
 
Yeah worth a punt i guess it reminds me of the Gt86 hype with it being a Toyota and that was very flat when i experienced one (only from passenger i admit)

Dislike my what? S2000? great car but to be honest its a driveway ornament since the MOT ran out a long time ago.
 
Simon said:
Yeah worth a punt i guess it reminds me of the Gt86 hype with it being a Toyota and that was very flat when i experienced one (only from passenger i admit)

Dislike my what? S2000? great car but to be honest its a driveway ornament since the MOT ran out a long time ago.
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Well drove GT86 and did not want one, lack of power a main reason but car was missing something else too that even with more power I’d still not want one, but Yaris is impressive.

Ah thought you’d fallen out of love with it the S2000 guess it probably needs a bit of work if it’s been sat years.
 
Gibbo said:
Well drove GT86 and did not want one, lack of power a main reason but car was missing something else too that even with more power I’d still not want one, but Yaris is impressive.

Ah thought you’d fallen out of love with it the S2000 guess it probably needs a bit of work if it’s been sat years.
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The GT86 is one of the best “out of the box” driving cars you can buy.

I’d take a purpose built RWD sports car over a turbo hatch everyday of the week.

Like you said above, it’s not all about power.
 
You need to rev the nuts off. Above 5000rpm it's much more responsive. The S2000 is kinda the same (and people used to complain about that too), there is nothing in the low revs.

People have got too used to driving turbo cars.
 
Great feedback Gibbo, good to hear it's living up to expectations and the hype. I still have around 3 months to wait :( .... Did take the RS out today, loved it, but then it ain't stock ;)
 
Nasher said:
You need to rev the nuts off it unlike a turbo car. Above 5000rpm it's much more responsive. The S2000 is kinda the same, there is nothing in the low revs.

People have got too used to driving turbo cars.
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Lol he’s got a 458 a M5 V10 and a S2000.
I’m sure he knows that some engines need to be revved
 
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