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EA888 rev limit

The Dude

Autocross Champion
Location
PNW
Car(s)
MK7 GTI S
So has anyone nailed down the specific failure point of the EA888.3? Assuming you have a turbo that continues to flow efficiently and the supporting mods to run it, what's keeping you from revving to 8k, or 8.5k, or even higher? I've been searching for the last half hour but haven't found anything.
 

jimlloyd40

Autocross Champion
Location
Phoenix
Car(s)
2018 SE DSG
The EA888.3 engine simply wasn't designed to rev that high. I've seen a few guys say they rev to 7500 RPM. Mine shifts at 7000.
 

The Dude

Autocross Champion
Location
PNW
Car(s)
MK7 GTI S
The EA888.3 engine simply wasn't designed to rev that high. I've seen a few guys say they rev to 7500 RPM. Mine shifts at 7000.
I understand that, but I was pondering the specific reason. Valve springs? HPFP gonna pop? All available turbos run out of air past 7500?
 

jimlloyd40

Autocross Champion
Location
Phoenix
Car(s)
2018 SE DSG
Valve springs and whatever other parts are necessary to rev that high. And if it could rev that high someone would build a turbo that would flow at that RPM. It would be laggy at low RPM's . A lot of the foreign exotic cars like Lamborghini, Ferrari etc rev that high but they have no low end torque. A very high revving engine isn't practical for street driving. A friend of mine used to have a Honda Prelude and that car revved over 7500 RPM but you had to keep it above 4500 RPM to have any power. It was fun to wind it out though. Had a little bit of Indy car sound at high RPM and the trans was a close ratio one that would keep it in the high RPM range.
 

The Dude

Autocross Champion
Location
PNW
Car(s)
MK7 GTI S
I'm told the head doesn't flow well, but I don't know that to be accurate either.
 

Escape Hatch

Autocross Champion
Location
USA
Car(s)
Mk7 GTI
It is an intriguing question and I am curious to know the answer. Current fuel cutoff for me is 7250 and I make power all the way up to that point. I'm sure these larger turbos can carry the power a bit further but the valve springs likely are not up to task. Perhaps a valve train upgrade with a port and polish?
 

Desslok

Autocross Champion
Location
PA
Car(s)
2019 Rabbit
High RPMs are more for getting the most out of a naturally aspirated engine. Kind of redundant on a big turbo motor.
Maybe for a full-on race car, but the law of diminishing returns applies well here.
 

roystr

Ready to race!
Location
California
"Undersquare" (small bore + long stroke) engines typically don't like to rev as high as oversquare engines (big bore + shorter stroke). The EA888 is significantly undersquare.

There's more side load on the cylinder wall vs oversquare. There are exceptions, of course. The 1.8 liter B18C5 in the Integra Type R is undersquare (but not as much as the EA888) and revs to 8400 and they run forever. The F20C in the Honda S2000 is oversquare and revs to 9000 rpm.

Plus, I think from a design perspective, it was setup with cams and a cylinder head that was optimized for lower revs and a turbo.
 

ChrisMk77

Autocross Champion
Location
Sweden
Car(s)
2018 GTI Performance
"Undersquare" (small bore + long stroke) engines typically don't like to rev as high as oversquare engines (big bore + shorter stroke). The EA888 is significantly undersquare.

There's more side load on the cylinder wall vs oversquare. There are exceptions, of course. The 1.8 liter B18C5 in the Integra Type R is undersquare (but not as much as the EA888) and revs to 8400 and they run forever. The F20C in the Honda S2000 is oversquare and revs to 9000 rpm.

Plus, I think from a design perspective, it was setup with cams and a cylinder head that was optimized for lower revs and a turbo.
It is more of a DI comuter engine design limitation with the waterjacketed exhaustmanifold limiting flow.

The 1.8t 20v loves to rev to 9000rpm+ when built with our bore and stroke for example.
 

swcrow

Autocross Champion
Location
Virginia
Car(s)
7.5
A friend of mine used to have a Honda Prelude and that car revved over 7500 RPM but you had to keep it above 4500 RPM to have any power. It was fun to wind it out though. Had a little bit of Indy car sound at high RPM and the trans was a close ratio one that would keep it in the high RPM range.
Honda S2000 in a nutshell. NA and 7000 rpm was its powerband. Constantly felt like I was going to blow the engine
 
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