Soldato
Toyota Yaris GR4 4x4 Rally going into production.....
Chucked my stock car on the dyno yesterday, just out of boredom really.
Very pleasant surprise. This was the best of 3 runs, others were 286 & 288.
Don’t think I’ll ever bother with power mods, but I would really like the roof put back to forged and probably adjustable springs to sort the ride height /corner weighting.
As I said on Instagram a happy dyno!
I suspect the cars in the U.K. on Vpower make around 270 horses due to knock sensors advancing timing but I think 290HP just shows this dyno to be a little happy, remember dyno operators can setup their dynos to vary results and many places do exactly this and it’s very possible to do on a MAHA.
Don't know if you're interested in buying a small RC car to go with it Tamiya Toyota GR Yaris - M-05 58684 (modelsport.co.uk)
My Mum got me one of those for Christmas, still need to build it.
Soldato
Interesting power figures, in fact probably the highest I've seen for a standard car !
Out of interest, I keep seeing "adjustable springs" being mentioned lately. What am I missing here? Since when can a spring be adjustable?
Think adjustable coilovers but without the damper
KW have offered adjustable springs for years, they include a hat and coil like coilovers use so you can spin the hat in or out and thus give you some height adjustment.
I won’t be touching suspension on mine, I don’t think it sits overly high and having some clearance is nice and the ride is fine, good infact yes it can struggle over some of the really bad roads but otherwise it’s fine.
Passed 1000 miles now and loving it still and absolutely thoroughly enjoy having all four tyres screaming for dear mercy on roundabouts, total hooligan.
As above, 2 springs and an adjustment ring essentially.
https://mss-sales.com/shop/porsche-991-1-2-gt3-gt3rs/
I am somewhat vexed by the dyno result myself, I did chuck a TDI Tuning box on it aswell which only made it 296. Makes me wonder if my car is running something a bit different or the tuning box is complete guff! Bit odd given others have had results from them.
Man of Honour
I don't disbelieve the power numbers on that dyno sheet.
Maha are very consistent on the calibration and validate the calibration with the same van that's dyno'd on different dynos every day of the week.
Sheet shows no operator fudge correction was applied and the temp/humidity too
The TDI tuning box was withdrawn from sale at many places due to a few tuners testing it and finding two things, it makes no power and it was also potentially unsafe because TDI have done zero real world testing. Their graphs on their website well I could draw better with a set of crayons and it’s clear all TDI do is use an algorithm for their never tested results and it’s all make believe and in the case of the Yaris GR has been proven to make no power as proven by yourself.
If you want to go tuning box route then DTUK is the proven and very well tested box, it’s also the box some Toyota franchises themselves offer and is the same box Litchfields and Milltek are using in their power packs.
Get a DTUK box and the gains should be 20-30HP and is the box people have been hitting around 4-4.5s 0-60’s with so real world proven gains.
I myself am just waiting to see if someone cracks the ECU plus the car I am finding is getting faster with miles.
They gave me an immediate refund regardless so, at least there’s that. As I understood it the Fensport guys just said it’s useless with stock cooling and all boxes have that problem. Power won’t last more than 1 pull regardless so no use on track.
Anyway it doesn’t need it really, I have no complaints performance wise. I do wish the seat was lower (hit my knees on the steering column sometimes) but so many other great things about the car I’m not fussed. I might consider the MSS springs just to reduce the roll a bit IF it takes over from the 4C for track duties next year.
Oh I know a couple other local owners getting the roof stripped and relaquered which I rather like too so, maybe that!
Anyway it doesn’t need it really, I have no complaints performance wise. I do wish the seat was lower (hit my knees on the steering column sometimes) but so many other great things about the car I’m not fussed. I might consider the MSS springs just to reduce the roll a bit IF it takes over from the 4C for track duties next year.
Oh I know a couple other local owners getting the roof stripped and relaquered which I rather like too so, maybe that!
Soldato
@Gibbo - What’s the generally accepted power output with the tuning boxes now that people have had time to test the various claims? I’ve got some potential fun and games ahead of me with the sprints this year as the Yaris’s are all in my class but there’s a 300hp cap on the class and I’m expecting one or two with tuning boxes to be pushing the boundaries a little 
Soldato
Personally wouldn't trust a DTUK box either.
I asked them some basic questions, in pursuit of not knackering my car. They responded by blocking my social media from theirs.
@Gibbo - What’s the generally accepted power output with the tuning boxes now that people have had time to test the various claims? I’ve got some potential fun and games ahead of me with the sprints this year as the Yaris’s are all in my class but there’s a 300hp cap on the class and I’m expecting one or two with tuning boxes to be pushing the boundaries a little
Depends on the dyno but generally the gain is around 25HP so about 295HP. If the car is running a turbo back exhaust then it’s around 300HP. Some have fitted larger intercoolers, full exhaust systems and tuning box and are around 315 horses.
@Gibbo - What’s the generally accepted power output with the tuning boxes now that people have had time to test the various claims? I’ve got some potential fun and games ahead of me with the sprints this year as the Yaris’s are all in my class but there’s a 300hp cap on the class and I’m expecting one or two with tuning boxes to be pushing the boundaries a little
Yup, there are quite a few YGR filling slots in sprints, they drop in the same class as my MX5.....
It's great that they are being bought by people willing to use them though rather than polishers.Yes it does, class spread in southwest is 1.8-2.6cc in A3, turbos get a 1.4 multiplier making the Yaris 2.23cc, its not the end of the world, just makes things hard for an NA car in that class.
