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For new X owners who have either driven or ridden in a Evo VIII or IX can you please describe what the powerband feels like to redline, does the X have good top end? Thank you
I have driven both 8's and 9's but the thing is all of them were never stock. They were all modified to about 350HP. All I can say about the X is that the top end isn't that great, it seems to flaten out at around 6000 RPM. A shop has told me that this is due to the throttle backing off at high RPMs when the boost reaches a certain point. The factory boost is set to about 1.2 bars but it spikes past 1.5 bars at times. When this happens, the ECU automatically backs off on the throttle and the boost drops to about 0.8 bars.
I will be installing an EVC 5 and boost gauge this weekend so hopefully I should be able to keep the boost at around 1.4 bars so the throttle doesn't back off.
 

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Yeah, but if you read what vivid racing is saying about the car then You'll notice that the reason that the car isn't that fast from the factory is that it's running retarded rich all throughout the rev range. The boost also drops too much toward redline. So, once these issues are fixed with an intake to lean things out (check out the results from vivid racings intake kit, very impressive) and a manual boost controller to help control the taper, the car will be a monster... although the best results are going to be had from an ecu flash. SiC, are you sure that the ecu mapping isn't just programmed to pull the throttle back at redline? I mean it seems kinda bizarre that the boost curve would be so unstable with a factory exhaust and tune. I mean usually what will occur if the boost spikes real bad is that the ecu will pull timing in an effort to reduce the chance of damage, not pull boost. I've been into the tuning scene for a while and have never heard of a car doing that. I mean usually if the car has an aftermarket turbo back exhaust that flows really well, the spiking can occur if the turbo's wastegate can't let enough excess boost out to keep up with the flow of the exhaust. Now, an ecu tune will usually correct this, however even with a proper tune, accelerating full throttle at low rpms in a high gear can and will cause a spike that usually settles as the rpms rise. Yet again this is in a high load/low rpm situation. High rpm spiking is strange, please try to find out what is causing this. Vivid racing has not mentioned anything about unstable boost curves, only that the boost drops toward redline as it should, just more than they would like. Now, I'm sure that you probably know most of the suff that I'm telling you, so please don't think that I'm trying to educate you, I'm just brainstorming outloud. It does seem strange though, doesn't it?
 

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SiC, are you sure that the ecu mapping isn't just programmed to pull the throttle back at redline?
I was quoting what Monster Sports told me about the throttle being pulled back at high rpms when the boost spikes.

One interesting thing came up on Japanese web sites and is causing alot of questions. According to a Japanese magazine called "My Car", they are saying that the EVO X's here have a hidden governor built into the ECU for breaking in the engine. It is suppose to "limit" the engine for high output until the odometer reaches 1000km. After the engine reaches 1000km, the output of the engine exceeds 300 HP.
:wtfsign:
 

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Thats really interesting. If that's true, I think that's really cool, and smart. Please keep us updated on the status of that...that is if any info is officially released proving this to be fact. This would really put to rest the question of why your motor is doing that.
 

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I was quoting what Monster Sports told me about the throttle being pulled back at high rpms when the boost spikes.

One interesting thing came up on Japanese web sites and is causing alot of questions. According to a Japanese magazine called "My Car", they are saying that the EVO X's here have a hidden governor built into the ECU for breaking in the engine. It is suppose to "limit" the engine for high output until the odometer reaches 1000km. After the engine reaches 1000km, the output of the engine exceeds 300 HP.
:wtfsign:
That is retarted - if it is true.
 

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I personally own an 2005 Evo 8 and Evo X.

Top End:
When the Evo 8 was stock it had the same boost taper which made the top end of 6000-7000 feel flat. Boost taper was 20 psi - 17 psi. The Evo X has a boost taper of 23 psi - 17 psi, but because of the more efficient turbo it doesn't feel like it falls completely flat but similar to the Evo 8.

Mid Power:
Peak Torque feels very linear all the way to redline through the midrange on the Evo X. My Evo 8 pulls much stronger and less linear to redline. The boost taper on the 8 doesn't occur until 6000 rpms. According to Vivid racing the Boost in the X starts dropping just after peak linearly till redline so it doesn't keep pulling like the 8 does. What I like is the power is linear and predictible which is probably why the SAWC likes when it determines how much torque to move around the system when it needs to adjust in real-time.

Low Power:
The Evo 8 spools slower than the Evo X. the new exhaust on the Evo X feeds the turbo much quicker and therefore feels like a larger displacement engine down low. Of course when full boost is realized it doesn't slam you back in your seat like the 8 does.
 

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I was quoting what Monster Sports told me about the throttle being pulled back at high rpms when the boost spikes.

One interesting thing came up on Japanese web sites and is causing alot of questions. According to a Japanese magazine called "My Car", they are saying that the EVO X's here have a hidden governor built into the ECU for breaking in the engine. It is suppose to "limit" the engine for high output until the odometer reaches 1000km. After the engine reaches 1000km, the output of the engine exceeds 300 HP.
:wtfsign:
this is pretty dumb but i guess it could prevent premature wear on the engine.
 

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I was quoting what Monster Sports told me about the throttle being pulled back at high rpms when the boost spikes.

One interesting thing came up on Japanese web sites and is causing alot of questions. According to a Japanese magazine called "My Car", they are saying that the EVO X's here have a hidden governor built into the ECU for breaking in the engine. It is suppose to "limit" the engine for high output until the odometer reaches 1000km. After the engine reaches 1000km, the output of the engine exceeds 300 HP.
:wtfsign:
:wtfsign: Makes wonderfully beautiful sense that saves them a couple thousand in warranty engine repair/replacement....hmm.. I wonder why they wouldnt openly state this especially if its just going to shut off on its own in due time....
 

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I was quoting what Monster Sports told me about the throttle being pulled back at high rpms when the boost spikes.

One interesting thing came up on Japanese web sites and is causing alot of questions. According to a Japanese magazine called "My Car", they are saying that the EVO X's here have a hidden governor built into the ECU for breaking in the engine. It is suppose to "limit" the engine for high output until the odometer reaches 1000km. After the engine reaches 1000km, the output of the engine exceeds 300 HP.
:wtfsign:

Interesting and certainly sounds plausible as a built in safegaurd for proper run-in...

This would certainly liven up the SST model :)

BTW I'm sure there are current owners of the X that have exceeded 1000km by now - they should know whether or not this is true from experience on their cars ??
 

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Discussion Starter · #18 ·
Wow thanks for the great write up, I am sure with some tuning, a nice turbo back and an intake we can fix the taper issue and feel the turbo surge again. What you described here sounds very similar to how a 04-07 Sti feels which isnt a bad thing of course. Does the X feel as fast as the 8 to you?


I personally own an 2005 Evo 8 and Evo X.

Top End:
When the Evo 8 was stock it had the same boost taper which made the top end of 6000-7000 feel flat. Boost taper was 20 psi - 17 psi. The Evo X has a boost taper of 23 psi - 17 psi, but because of the more efficient turbo it doesn't feel like it falls completely flat but similar to the Evo 8.

Mid Power:
Peak Torque feels very linear all the way to redline through the midrange on the Evo X. My Evo 8 pulls much stronger and less linear to redline. The boost taper on the 8 doesn't occur until 6000 rpms. According to Vivid racing the Boost in the X starts dropping just after peak linearly till redline so it doesn't keep pulling like the 8 does. What I like is the power is linear and predictible which is probably why the SAWC likes when it determines how much torque to move around the system when it needs to adjust in real-time.

Low Power:
The Evo 8 spools slower than the Evo X. the new exhaust on the Evo X feeds the turbo much quicker and therefore feels like a larger displacement engine down low. Of course when full boost is realized it doesn't slam you back in your seat like the 8 does.
 

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Wow thanks for the great write up, I am sure with some tuning, a nice turbo back and an intake we can fix the taper issue and feel the turbo surge again. What you described here sounds very similar to how a 04-07 Sti feels which isnt a bad thing of course. Does the X feel as fast as the 8 to you?
i can't really say for sure the 8 isn't stock anymore. i'm used to 300 whp car that's 3000lbs so the X is much slower. I would say the X is more predictible stock.
 

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Discussion Starter · #20 ·
i can't really say for sure the 8 isn't stock anymore. i'm used to 300 whp car that's 3000lbs so the X is much slower. I would say the X is more predictible stock.

I see, have you driven or ridden in a stock Sti and if so can you compare the X to this please. Also which car do you like more the 8 or X? Thanks
 
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