GR Yaris Head gasket gone on Motive Garage GR

[Lauren]

Subaru guys know the pain. Will be interesting to see what solution the aftermarket comes up with if the cylinders are walking. However, I would wager they aren't currently at this power. Hopefully, it is as relatively simple as aftermarket head bolts and head gasket.

I don't think they will, given it's not an open deck in the purest sense as the open part is only so to halfway down the bore.

 

[GRWTF]

I don't think they will, given it's not an open deck in the purest sense as the open part is only so to halfway down the bore.

With my engine out I am scrambling to find head bolts at 2000 quality grade but the only ones so far are custom 625 grade which won't do. May pull the head bolts and measure but I am likely out of time for this first phase. When I do power the engine will need to come out again for head bolts (when ARP2000's are available), MLS gasket (either stock or improved aftermarket), and anything else that pops up between now and then.

Thinking about the labour cost that could have been saved doing it now is depressing...I need a drink

 

[Tralien]

Interresting question for me is the rev limit. Coming from honda where we first raised the rev limit for about 500 rpm after installing a programmable ecu, I wonder what revs you can run and how long you can hold the torque. The upgraded springs should help to rev the car to its limit...motive run 7250 as I can see in the vid. Is this stock limit? Did they raise the limit? Looking at the torque curve they should have enough to make more hp when they go for 7500 or 7800 e.g.

So more power not from more boost, but from higher revs. Can anyone share experience with that?

 

[amarce]

Interresting question for me is the rev limit. Coming from honda where we first raised the rev limit for about 500 rpm after installing a programmable ecu, I wonder what revs you can run and how long you can hold the torque. The upgraded springs should help to rev the car to its limit...motive run 7250 as I can see in the vid. Is this stock limit? Did they raise the limit? Looking at the torque curve they should have enough to make more hp when they go for 7500 or 7800 e.g.

So more power not from more boost, but from higher revs. Can anyone share experience with that?

Hi Tralien,

This:

Our first failure! - Valve Springs

So, unfortunately we joined the small but expanding club of smashed rockers, bent valves and damaged camshafts! See how we attempt to fix the problem along with some oil pressure loss under braking.

www.fensport.co.uk

 

[Chrisnufc]

We bought a 3 year old Rav4 T180 2.2 that drank oil like I drink tea - about 10 cups a day New short engine from Toyota along with lots of other bits & pieces. This was in 2011 & I'm not concerned about anything similar happening with the GR engine. If the head gasket is only going to give up after getting a beasting at 37 psi, then the majority of us have nothing to worry about

36psi it is

 

[Onehp]

For us normal owners, knowing that the fundamentals are capable of much more than the 50-ish hp tickles we are likely to give the engine with a bit more boost and an induction/exhaust gives a lot of comfort.

Yes, mechanically, but watch out with heat. Stock engine runs hot and relatively lean and this can destroy an engine long before running big numbers. E.g. Motive run port injection, E85, big turbo and open exhaust and all those gives a massive cooling effect and flow efficiency and allows for much advanced timing to make 'low load' power. If it weren't for that, instead of 37psi/2,5bar they would need to run a theoretical 58psi/4bar for double the power. Even so, they ran significantly lower power on track.

Just saying it's not linear and the false comfort of 'it's only' tickles can kill an engine, still need to keep eyes open. Personally I am more interested what power this car can run reliably doing 50'000km on the Nordschleife....

 

[Tralien]

Hi Tralien,

This:

Our first failure! - Valve Springs

So, unfortunately we joined the small but expanding club of smashed rockers, bent valves and damaged camshafts! See how we attempt to fix the problem along with some oil pressure loss under braking.

www.fensport.co.uk

Thx for that....puh..thats not much...7600....to be clear.....aftermarket springs were already added? Or could you run 7600 safe with upgraded springs?

 

[amarce]

Thx for that....puh..thats not much...7600....to be clear.....aftermarket springs were already added? Or could you run 7600 safe with upgraded springs?

with upgraded springs (And the EZ cams, it's a good choice to change them when you are there), I think that you can rev it pretty high (You should ask them the revlimit, but I assume that 8K can be achieved). This would not do a lot of sense since this little engine needs A LOT of air at that revrange

When the engine failed for them was on stock springs, so that's why they released the springs, to mitigate valve float when the turbo presure is rised and when RPM are increased.