How do newage JDM engines rev to 8k? what extras do they have making this possible?
02 November 2010, 11:20 AM
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How do newage JDM engines rev to 8k? what extras do they have making this possible?
As above.
what makes them rev higher and is it possible to get a uk engine to rev that high?
anyone raised the rev limit on their uk engine by any chance?
Also what would it take when getting my 2.1 built to get it to rev to 8/8.5k rpm?
Eddy
what makes them rev higher and is it possible to get a uk engine to rev that high?
anyone raised the rev limit on their uk engine by any chance?
Also what would it take when getting my 2.1 built to get it to rev to 8/8.5k rpm?
Eddy
02 November 2010, 11:28 AM
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I asked Andrew Carr to raise mine...
He said he usually drops it by 500 rpm if you ask !
dunx
P.S. Possibly more aggressive cam timing/lift ?
P.P.S. As A.J. @ Enginetuner... Arf's does it ( but that may be a billet crank > £2K ! )
He said he usually drops it by 500 rpm if you ask !
dunx
P.S. Possibly more aggressive cam timing/lift ?
P.P.S. As A.J. @ Enginetuner... Arf's does it ( but that may be a billet crank > £2K ! )
Last edited by dunx; 02 November 2010 at 11:29 AM.
02 November 2010, 11:37 AM
#3
As for the 2.1 you dont need a fancy billet crank to rev that high, Andy F was revving to that with a standard sti crank. Would advise 1 piece valves, double valve springs,possibly titainium retainers and better cams though.
Banny
02 November 2010, 11:50 AM
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i'll need to get some prices on them, i defo want a higher rev limit on the new engine.. would it require any different parts to get it to 9/9.5 like yours banny? or a much bigger cost or are they similar price range?
02 November 2010, 01:26 PM
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Valvetrain and nitrided crank. 
To a certain degree unless you have a big turbo to make use of the extended range, I would question any need to extend it past 7k.
To a certain degree unless you have a big turbo to make use of the extended range, I would question any need to extend it past 7k.
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02 November 2010, 01:43 PM
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I asked Bob Rawle to map mine (UK classic) for 8250 rpm as I have STi3 heads so thought it would be OK ... he said that I'd need the following before he'd do it:
"Raising the rpm limit that far strictly needs the valve train to be uprated, solid lifters as an essential, otherwise the shims are known to jam valves open, also you need to consider double valve springs"
Zak @ Mocom suggested that it's not a cheap mod
TX.
"Raising the rpm limit that far strictly needs the valve train to be uprated, solid lifters as an essential, otherwise the shims are known to jam valves open, also you need to consider double valve springs"
Zak @ Mocom suggested that it's not a cheap mod
TX.
02 November 2010, 01:57 PM
#10
I asked Bob Rawle to map mine (UK classic) for 8250 rpm as I have STi3 heads so thought it would be OK ... he said that I'd need the following before he'd do it:
"Raising the rpm limit that far strictly needs the valve train to be uprated, solid lifters as an essential, otherwise the shims are known to jam valves open, also you need to consider double valve springs"
Zak @ Mocom suggested that it's not a cheap mod
TX.
"Raising the rpm limit that far strictly needs the valve train to be uprated, solid lifters as an essential, otherwise the shims are known to jam valves open, also you need to consider double valve springs"
Zak @ Mocom suggested that it's not a cheap mod
TX.
Banny
02 November 2010, 11:22 PM
#20
Nope engine hadn't blown, I put a for sale ad up as money was a little tight at the time... Had a couple of issues with the breather system which was causing it to smoke slightly in stop start traffic but once I plumbed the pcv back in it's been running very well, covered 3k miles since then. Tbh I normally change gear just before it reaches 8k as the power starts to tail off... When this engine fails I'll look at building a new one with uprated valvetrain/cams etc.. But so far it's been fine!
03 November 2010, 07:57 PM
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No Andrew Carr wouldn't raise it... 
This was on a car with a useable power band from 6K to 7500 rpm.
So I needed it badly...
I wouldn't expect to get to 8500 rpm except on the dragstrip to save a gearchange.... IMHO.
dunx
P.S. I shift at 7400 rpm, and love the idea of reachimg 8000+ rpm once a month. A.J. @ EngineTuner is supposed to be sorting my heads, but he's very busy at the moment... so I'm waiting for the phone call to discuss "spec".
This was on a car with a useable power band from 6K to 7500 rpm.
So I needed it badly...
I wouldn't expect to get to 8500 rpm except on the dragstrip to save a gearchange.... IMHO.
dunx
P.S. I shift at 7400 rpm, and love the idea of reachimg 8000+ rpm once a month. A.J. @ EngineTuner is supposed to be sorting my heads, but he's very busy at the moment... so I'm waiting for the phone call to discuss "spec".
Last edited by dunx; 05 November 2010 at 07:20 PM.
04 November 2010, 01:14 PM
#22
Nope engine hadn't blown, I put a for sale ad up as money was a little tight at the time... Had a couple of issues with the breather system which was causing it to smoke slightly in stop start traffic but once I plumbed the pcv back in it's been running very well, covered 3k miles since then. Tbh I normally change gear just before it reaches 8k as the power starts to tail off... When this engine fails I'll look at building a new one with uprated valvetrain/cams etc.. But so far it's been fine!
Ohh. 8k would have been a bargain then for a working car!!
04 November 2010, 01:25 PM
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No Andrew Carr wouldn't raise it...
This was on a car with a useable power band from 6K to 7500 rpm.
So I needed it badly...
I wouldn't expect to get to 8500 rpm except on the dragstrip to save a gearchange.... IMHO.
dunx
P.S. I shift at 7400 rpm, and love the odea of reachimg 8000 rpm once a month. A.J. @ EngineTuner is supposed to be sorting my heads, but he's very busy at the moment... so I'm waiting for the phone call to discuss "spec".
This was on a car with a useable power band from 6K to 7500 rpm.
So I needed it badly...
I wouldn't expect to get to 8500 rpm except on the dragstrip to save a gearchange.... IMHO.
dunx
P.S. I shift at 7400 rpm, and love the odea of reachimg 8000 rpm once a month. A.J. @ EngineTuner is supposed to be sorting my heads, but he's very busy at the moment... so I'm waiting for the phone call to discuss "spec".
as for your build dunx.. are you leaving car with engine tuner? or getting heads shipped back here?
04 November 2010, 01:27 PM
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Nope engine hadn't blown, I put a for sale ad up as money was a little tight at the time... Had a couple of issues with the breather system which was causing it to smoke slightly in stop start traffic but once I plumbed the pcv back in it's been running very well, covered 3k miles since then. Tbh I normally change gear just before it reaches 8k as the power starts to tail off... When this engine fails I'll look at building a new one with uprated valvetrain/cams etc.. But so far it's been fine!
any word from martyn or JGM when mapping it for the higher revlimit? any advice or warning from them?
05 November 2010, 02:04 PM
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It's still big fun trying to kill mine with 2 bar of boost
I'm aiming to get into a budget restricted 2011 "slot"...
It's either me doing it, or my MOT tester Ben the Ev* man, or if I can scrape up some more shekhls AJ himself
I'd like it strong and reliable, not chasing a number... just want to enjoy it for what it does best
LOL
dunx
I'm aiming to get into a budget restricted 2011 "slot"...
It's either me doing it, or my MOT tester Ben the Ev* man, or if I can scrape up some more shekhls AJ himself
I'd like it strong and reliable, not chasing a number... just want to enjoy it for what it does best LOL
dunx
