2.5 rev limit
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2.5 rev limit
What derives the lower rev limit of the 2.5 engines?
My current 2.0 (2.1stroker) is at its limit due it being an open deck block and I just want to keep an eye open for future upgrades. If I'm going to convert a block to closed deck (closed deck blocks seem quite scarce atm) I figure I might as well convert a larger capacity engine but I'm concerned about the lower rev limit.
Any thoughts?
My current 2.0 (2.1stroker) is at its limit due it being an open deck block and I just want to keep an eye open for future upgrades. If I'm going to convert a block to closed deck (closed deck blocks seem quite scarce atm) I figure I might as well convert a larger capacity engine but I'm concerned about the lower rev limit.
Any thoughts?
#2
What derives the lower rev limit of the 2.5 engines?
My current 2.0 (2.1stroker) is at its limit due it being an open deck block and I just want to keep an eye open for future upgrades. If I'm going to convert a block to closed deck (closed deck blocks seem quite scarce atm) I figure I might as well convert a larger capacity engine but I'm concerned about the lower rev limit.
Any thoughts?
My current 2.0 (2.1stroker) is at its limit due it being an open deck block and I just want to keep an eye open for future upgrades. If I'm going to convert a block to closed deck (closed deck blocks seem quite scarce atm) I figure I might as well convert a larger capacity engine but I'm concerned about the lower rev limit.
Any thoughts?
They run perfectly well at well over 500hp....
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JGV: as in, mapper won't push it further than 440bhp @ 28psi
Last edited by cardinal.sin; 26 May 2016 at 08:07 PM. Reason: Error
#5
So you are at the Rev limit of an open deck block? That makes no sense....
Decent heads are decent heads.... flow benched, port matched, over size valves, double springs, retainers, lairy cams, etc...
Decent heads are decent heads.... flow benched, port matched, over size valves, double springs, retainers, lairy cams, etc...
Last edited by JGlanzaV; 26 May 2016 at 08:09 PM.
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Pat @ Scoobyclinic.
Spec: 2.1 budget RCM stroker kit, JDM big port AVCS heads with UK spec cams and valves (bought heads from here recently), HDI FMIC, ID1000, RCM 340, fuelab FPR, GT spec headers, SC42+, Meth injection kit, 4bar map sensor, syvecs. Think that's about it. I know the turbo won't help with the power but was hoping for over 450bhp on the meth map.
Yes, I know RR figures mean very little in the real world blah blah....
Spec: 2.1 budget RCM stroker kit, JDM big port AVCS heads with UK spec cams and valves (bought heads from here recently), HDI FMIC, ID1000, RCM 340, fuelab FPR, GT spec headers, SC42+, Meth injection kit, 4bar map sensor, syvecs. Think that's about it. I know the turbo won't help with the power but was hoping for over 450bhp on the meth map.
Yes, I know RR figures mean very little in the real world blah blah....
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I started looking at CDBs, realised there aren't many about, looked into CDB conversions then looked into 2.5 CDB conversions and wondered why the rev limit was in place (which Banny answered).
As per a previous thread on here, in which you proved to very helpful and convincing, we discussed cams and torque curves etc and I agreed that midrange and a wide-as-possible torque curve was preferable. That's why I was concerned about the lower rev limit of the 2.5 engines, as I figured it would cap the upper limit of my torque curve.
Does that make sense?
EDIT
And yeah, I re-read your reply and realised I'd read your reply wrong so I edited my reply!!! FFS! lol
Last edited by cardinal.sin; 26 May 2016 at 09:11 PM.
#11
No. Sorry, I may have been unclear. I'm at my power limit, according to my mapper, due to me having an open deck block. This is my current situation.
I started looking at CDBs, realised there aren't many about, looked into CDB conversions then looked into 2.5 CDB conversions and wondered why the rev limit was in place (which Banny answered).
As per a previous thread on here, in which you proved to very helpful and convincing, we discussed cams and torque curves etc and I agreed that midrange and a wide-as-possible torque curve was preferable. That's why I was concerned about the lower rev limit of the 2.5 engines, as I figured it would cap the upper limit of my torque curve.
Does that make sense?
EDIT
And yeah, I re-read your reply and realised I'd read your reply wrong so I edited my reply!!! FFS! lol
I started looking at CDBs, realised there aren't many about, looked into CDB conversions then looked into 2.5 CDB conversions and wondered why the rev limit was in place (which Banny answered).
As per a previous thread on here, in which you proved to very helpful and convincing, we discussed cams and torque curves etc and I agreed that midrange and a wide-as-possible torque curve was preferable. That's why I was concerned about the lower rev limit of the 2.5 engines, as I figured it would cap the upper limit of my torque curve.
Does that make sense?
EDIT
And yeah, I re-read your reply and realised I'd read your reply wrong so I edited my reply!!! FFS! lol
Personally I'd stick with the open deck block and ask for it to be pushed a bit more...... unless there is a component in your engine that can't handle it? The block will be fine...
Like I said my odb did 30k miles at over 500hp. A piston gave up when we started pushing it towards 600. But that was due to a manufacturing fault with the pistons and gudgeon pins not the block.
And bare in mind my subaru is a track and weekend toy. Everytime I go out in it I kick it's ****ing head in, none of those 30k miles were easy miles....
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