Evo General : Evo I - X

[greenmivec]

Dear Brothers,

I open this thread for us to discuss anything about evo. For a start i am just curious what is the safe cruising speed for an evo? In my case is evo ix but i am sure not much different from other earlier evo since they are force induction.

What is your cruising speed? In other words the safe rpm to cruise on highway since i believe

High rpm = boost kicked in = pressure built up in turbine

For evo ix the boost kick in at 3500rpm, therefore i will drive around 3000rpm which is around 130km/h. Is it safe to maintainthat speed all the way from KL to Kuantan for example? But because of my curiousity, i drop the speed to 110 - 120km/h with less than 3000rpm

But how about the gear, is the gear safe to maintain because of tje short gear ratio?

With my cruising speed at 3000 to below boost, i manage to get the fuel is above half tank from KL to Kuantan and around 430 and above. Km full tank.

Please advise guys

 

[stutzedward]

I don't know about Evo but I drive an Airtrek Turbo with similarly detuned E7 4G63T. I drive all the way from Singapore back to KL averaging around 160-180kph all the way (mind me, point to point from Singapore Beach Road to Old Klang Road KL, 3 hours 15 mins including custom @ 2nd link) where RPM is around 3K.. boost active around 0.2 bar.. no problemo at all. No hiccup at all. :)

http://carphotos.cardomain.com/ride_images/4/700/4589/39249794019_large.jpg

 

[greenmivec]

Thanks for the prompt reply bro edward. Wow that is fantastic, on my way back to kl from cameron highland last week end there was a fast airtrek as well.

Airtrek and evo 7 is using the same engine. So i assume there might be no problem to maintain high speed right? But i m amazed 180km/h the rpm is only around 3600rpm. May be because it is tuned for airtrek. For evo 180km/h i think around 4500 rpm already.

I m not really concern at the fuel consumption, i just afraid that i might do damage to the turbine if maintin high speed. How does MIVEC helps in this? Since mivec n vtec are meant for top speed, true?

My ix really nice to cruise at 140 - 160km/h, but that is already 3500rpm.

 

[stutzedward]

Airtrek uses E7 GTA gearbox cos it's auto.

Mivec 4g63t is better compared to older Evos as Mivec gives more torque. I don't think u need to worry cos these engines are bullet proof robust (unless yr engine has internal damage). So far, they can be tortured n no sweat with it.

 

[Jun_EK9]

so far i have no prob maintaining high speed at hwy.my normal cruise around 160-180kmp and manage 30c per km

 

[greenmivec]

thanks a lot stutzedward and jun ek9

if we maintain 3500 and above rpm, and the boost kicked in, it shall be no problem right? it wont do any harm to turbo?

from your experience i believe shall be no problem right?>


forget to tell you guys, that my evo ix is stock. no modification at all. only bost controller and boost meter installed. so is it safe too?

 

[aycy]

how many bar is ur boost controller set to?

 

[greenmivec]

bro aycy

1.0 bar only, but i think i accidently change the value in the controller, it goes to 1.1 something bar. but not reach 1.2 bar.

my car condition is all stock.

 

[pengyu]

i drove from Gombak to Kuantan before using LPT cruising at 180kmh and above all the time. That's almost two hours of high speed, and so far (alhamdulillah), fortunately nothing is wrong. I dont think these Evo engine will have problem with that.

RPM around 3-4k.

 

[greenmivec]

Bro pengyu

Thanks for the reply. Wow 180km/h, your fuel must be like water right hahaha

I cruised at 160km/h and rpm 3500-4000 just nw and nothing strange occur. Water temp normal, boost was around 0.2.The only different is the fuel consmption different about 50km.

So i believe there will be no problem cruising at high speed for our evo. It is very fun especially at karak, 140km/h cormering, although my heart almost stop pumping hahah

Thanks for the advise guys

 

[EVOFans]

bro aycy

1.0 bar only, but i think i accidently change the value in the controller, it goes to 1.1 something bar. but not reach 1.2 bar.

my car condition is all stock.

Err...you are under boosting your car lar
AFAIK,stock EVO IX should see 1.4bar peak and taper a bit at top end

 

[R11]

I drive evo IX as well, I can maintain cruising speed around 140 -160km/h on the hi-way.

The problem is the oil-temperature, when it exceeds 110 deg, I started to slow down.

So, other than the off-boost condition, what is the safe oil-temperature to run during cruising?

 

[greenmivec]

Ooo really ker bro,

It may be because the dealer set it to 1.0 at the boost controller. I do remember reading the stock boost is 1.38. But not really sure until i got the cr in hand.

So guys, should i set it back to 1.38 boost? I just have to set it at the boost controller right?no parts upgrading required right?

 

[Veloc]

I do not drive an evo, but it is my dream car. And I drove a turbo diesel car before though. What I think is, if the engine is built for turbocharging, no problem. Even if you are at mid rpm where the turbo kicks in, but if you are cruising, means it is on low load. Then vacuum will always be generated in the manifold. Even if there is boost, it will be very low because the load is low. Like what our brother said in the reply above, the boost is at a mere 0.2 bar only. So no problem. I use to drive my old turbo diesel junk last time with a sucky engine and it is not a tough car at all. Boost at 5 psi (around 0.4 bar) at 100 kph on highway. No problem.

So for a badass, bullet proof, built for punishment engine such as the evo's 4G63T, I don't see any effects that are bound to happen besides the engine thanking and rewarding you with a smile...

Long live evo.

 

[greenmivec]

Bro veloc

Now i understand how turbo works. Although the rpm is 3500 - 4000, the built up pressure in he turbine is a low boost around 0.2 bar. The boost will pick if we continue to floor the gas. With the low boost built it is safe to cruise at high speed.

Even i came across reading in evom, the boost also have some kind of cut off to release the over pressure.

When evofans told about my ix is low boost, i search and found out, that boost level will be different avcording the gear used. The stock boost is 1.38 bar.

But the low gear is around 1.1 bar and high gear will be at 1.38 and drop to 1.2.

How about you guys?

I confuse a bit. But should the boost be the same for all time?according to evom.net, it might be it is tuned to remove the boost limiter.

Please correct me if i understood in wrongly.

---------- Post added at 10:37 PM ---------- 6 hour anti-bump limit - Previous post was at 10:34 PM ----------

Please click here for the discussion

http://http://forums.evolutionm.net/evo-engine-turbo-drivetrain/196900-stock-evo-ix-mr-boost-questions.html

But my ix if i look at my gauge correctly all the way is around 1.1 - 1.2 bar only, should i set the controller to 1.38bar?

---------- Post added at 10:40 PM ---------- 6 hour anti-bump limit - Previous post was at 10:37 PM ----------

I drive evo IX as well, I can maintain cruising speed around 140 -160km/h on the hi-way.

The problem is the oil-temperature, when it exceeds 110 deg, I started to slow down.

So, other than the off-boost condition, what is the safe oil-temperature to run during cruising?

Good question bro.

What is the safe oil temp?

Bro r11 what is your boost for gear 1 - 6? All same ? 1.38bar?

 

[stutzedward]

Yr right bro greenmivec, boost level varies by gears... but difference should NOT be too much. Prolly +/- 0.15 bar the most.

My airtrek stock boost level is 0.6 bar (varies between models, some models are 1 bar stock) and now, I have it at 1.2bar with boost controller. It hovers between 0.9 bar to 1.2 bar depending on gears.

 

[greenmivec]

I dont really understand how to use the boost controller. If i set the boost, actually the mechanic set it, to 1.0 bar, does it mean all gear will be at 1.0 bar or will still varies according to gears?

There are 4 levels to set in my m7 boost controller. Level 1 1.0 level 2 1.1 level 3 1.2 and level 4 1.3.

If i use level 1, so it wont go until 1.3 right? But it happened to jump to 1.2 bar. Never experience 1.38 or 1.4 bar.

 

[Veloc]

Boost controller to control boost lo... But it is limited by your mechanical wastegate. The wastegate sets the limit of max pressure you can have. The electronic boost controller can let you have anything in between the the minimum and the max pressure allowed by the wastegate. Some let you programme different boost on different rpm points.

Example, if your wastegate can take maximum 1.3 bar, you can control your boost anywhere from 0.5, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2 and max 1.3 bar. But cannot go 1.4 bar and above.

 

[greenmivec]

But why mine is only 1.1 bar?

Is it because of the boost set at the controller?

How do i set it back to normal boost setting?

 

[kariayam]

Later evos boost curve do have boost spike... it will spike to 1.4 bar FOR FEW SECONDS then drop to lower pressure (may be 1.2 bar..i'm not sure) under load. This curve is standard setting by the manufacturer. (look for top gear or fifth gear tv show..cant remember which one)

As with electronic boost controller, the 2 main functions are:
1-to set your boost
2-to set boost response (also called as gain setting- how fast maximum/full boost can be built up)- means you will be able to get maximum/full boost at earlier RPM.

The boost controller will limit the maximum boost pressure as set by you. if you set 1 bar, then the maximum pressure will be limited to only 1 bar with no boost spike,boost creeps, over boost..etc..whatever you call it..

Now we will talk about gain setting. If you set the gain setting too high,you will have the risk of boost spike. i.e: if your boost setting is 1 bar, then you set too much gain, there will be possibilty the boost will spike to above 1 bar before returning to 1 bar.

Conclusion:
1-Set the boost..
2- set the gain
3- fine tune >adjust the gain to minimalize or to eliminate the boost spike.
4- READ your boost controller manual on how to operate the controller

up to this point, i dont understand why you'll need a boost controller on the stock evo ix. when you adjust the boost controller, it will eliminate the factory boost setting which features the '1.4 bar boost spike'. And you will not want to set the boost higher than 1.4 bar or constant at 1.4 bar as the fuel system and engine management are still stock which is beyond the turbo and engine capability. ~~~~1.4 bar is considered high for a stock turbo and engine

And my previous experience of high speed cruising with evo was, I travelled quite often from KL to Terengganu few years ago. maybe once a week. cruising speed on the LPT Highway was 160-180km/h @ 4000,4500RPM. Water temp was perfect but still i had my cranckshaft bearings fucked.

It's beacause the engine oil must had been boiling hot as i dont have any oil temp gauge. The hot oil cannot provide enough protection for the bearings. I then had my engine overhauled. ( from positive sides: it's time for Upgrades )

Lesson learnt for all the high speed cruisers, upgrade your oil cooler or install an oil temp gauge to monitor your oil temp. these few hundred bucks of investment will save you thousands of bucks and time. And water temp gauge too...Good Luck!!!!!