mini valver Posted June 29, 2016 Share Posted June 29, 2016 Wanting to raise my rpm for a little while till I get my head built will the stock cams and valve springs handle 8300 Quote Link to post Share on other sites
5e colin Posted June 29, 2016 Share Posted June 29, 2016 (edited) no 7600rpm is about the max i would go on a stock head and i like pushing limite often valve float starts occurring around that rpm also stock intake is a killer you be just revving and making no progress thats on 4efte whats your spec ??? Edited June 29, 2016 by 5e colin Quote Link to post Share on other sites
mini valver Posted June 29, 2016 Author Share Posted June 29, 2016 Everything but the head race tech custom 1l larger inlet fully forged lightened and balanced 4efte. Godzilla exhaust Mani holset turbo. Everything but the head am on with doing 1now. I thought stock rpm was 7800 Adam b said should be safe to go to 8200 8300 as some of them piggy back ecu red to about that. Quote Link to post Share on other sites
daniel_g Posted June 29, 2016 Share Posted June 29, 2016 Some of the P&P ECUs go to about 8.5k RPM.I wouldnt be trusting 20year old valve springs. They'll sag over time. Get a set of Cruise or Zisco then raise the rev limit. Quote Link to post Share on other sites
5e colin Posted June 29, 2016 Share Posted June 29, 2016 Everything but the head race tech custom 1l larger inlet fully forged lightened and balanced 4efte. Godzilla exhaust Mani holset turbo. Everything but the head am on with doing 1now. I thought stock rpm was 7800 Adam b said should be safe to go to 8200 8300 as some of them piggy back ecu red to about that. i advise you not to go there with stock springs its not because a P&P revs that high a stock engine will !!! Quote Link to post Share on other sites
mini valver Posted June 29, 2016 Author Share Posted June 29, 2016 I am only doing it for a while the head was rebuilt when it was forged about 4k mikes ago Quote Link to post Share on other sites
mini valver Posted June 29, 2016 Author Share Posted June 29, 2016 Just strange they do rev that much if they can not take it cheers for the info tho Quote Link to post Share on other sites
5e colin Posted June 29, 2016 Share Posted June 29, 2016 it only takes 0.0001 of a sec. to drop that valve Just strange they do rev that much if they can not take it cheers for the info tho not strange atal there mapped for tuned engines Quote Link to post Share on other sites
mini valver Posted June 29, 2016 Author Share Posted June 29, 2016 My engine is tuned but the only thing left to do is the head. What is stock Max rpm I always thought it was 7800 Quote Link to post Share on other sites
triple j Posted June 29, 2016 Share Posted June 29, 2016 Your surely going to need the rpm with the holset lol. Quote Link to post Share on other sites
morgey Posted June 29, 2016 Share Posted June 29, 2016 P and P ecus were actually a mapped ecu in japan, they were base mapped to set mods, the ones that rev to 8.5k will have been on a built engine. Others will be for mild tuned engines. Front mount, exhaust, more boost or bigger turbo. Limiter around 7.5k and delimited speed. They are good though as they still use the base ecu's parameter selection so can be used on a variety of setups fairly safely. As for stock max rpm, as colin said 7600 would be about it, any more and you will just be pushing your luck. Quote Link to post Share on other sites
AdamB Posted June 29, 2016 Share Posted June 29, 2016 (edited) You'll be fine to rev to 8100-8300rpm (on new OEM springs) as I said on the phone pal. Some P&P's go to about this or slightly more. Yes the old valve springs will have sagged, lost tension blah blah, but on the other hand I certainly wouldn't be going chucking in a set of Zisco or Cruise springs because they don't come with any specs to install them at! (Zisco at least). Chucking in a set of aftermarket springs without checking the base pressure, installed height, free height etc etc is asking for trouble! Springs aren't necessarily the issue, its the acceleration from the cam that is. Edited June 29, 2016 by AdamB Quote Link to post Share on other sites
5e colin Posted June 29, 2016 Share Posted June 29, 2016 My engine is tuned but the only thing left to do is the head. What is stock Max rpm I always thought it was 7800 any time you go above 7400/7600rpm you risk the chance to fuck up your engine trust me i fucked up more engines then probly anyone on here ADAMb !!!!! no chance a stock spring gose above 8 k if you do and it survives its pure luck she is still going ( thats what 5e colin says ha ha ) Quote Link to post Share on other sites
Sudden Posted June 29, 2016 Share Posted June 29, 2016 *seconds Adam's post* new oem valve springs, valve clearances well within spec. Unless it's a 5e bottom end that hasn't been balanced and strengthend don't go over 8 Quote Link to post Share on other sites
Whitenoize Posted June 29, 2016 Share Posted June 29, 2016 Mine went to 8200 with a mines p&p rarely saw that sort of rpm but didn't have any problems Quote Link to post Share on other sites
adzy Posted June 30, 2016 Share Posted June 30, 2016 Mine went to 8200 with a mines p&p rarely saw that sort of rpm but didn't have any problemsI'm the same with my sard. No point in me revving it right out on a ct9 really lol Quote Link to post Share on other sites
mini valver Posted June 30, 2016 Author Share Posted June 30, 2016 Cheers lads. The holset I have is a hybrid kind of thing and it's boosting 1.3 bar at the mo at about 4k so it's very good for spool. Need the extra revs just so I can push it but like I say I am in the process of building a head just won't be ready for when I need it so I.e wanting to rev my old head a little bit. Quote Link to post Share on other sites
Foggy Posted June 30, 2016 Share Posted June 30, 2016 Stock springs will take 8k no problem Quote Link to post Share on other sites
Maxep Posted July 1, 2016 Share Posted July 1, 2016 Revved mine plenty of times to 8.5k with a P&P ecu, still goin strong . Quote Link to post Share on other sites
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