power_slide Hitting the apex Donating Members 596 Member For: 16y 8m 10d Gender: Male Location: Miranda Posted 05/07/10 12:10 PM Share Posted 05/07/10 12:10 PM (edited) What is the general rpm limit for a straight 6? I know a v8 is somewhere around 7200 rpmAfter that the power gain is minimal Edited 05/07/10 12:12 PM by power_slide Link to comment https://www.fordxr6turbo.com/forum/topic/69196-gas-bmw-2jz-street-engine/page/2/#findComment-1021936 Share on other sites More sharing options...
senna_T Forged Member Lifetime Members 15,818 Member For: 18y 4m 21d Gender: Male Location: SW Sydney Posted 05/07/10 12:13 PM Share Posted 05/07/10 12:13 PM nah you don't need to, but you need decent rpm to spin big boost to run big MPH. If you have a 2-step limiter set at 4500rpm for example to build boost, then your rpm limit is set at 7000rpm, its not alot of usable power to get down the track. The goal posts change when it comes to bigger cube motor, trans choice, then obviously diff ratio etc etc Link to comment https://www.fordxr6turbo.com/forum/topic/69196-gas-bmw-2jz-street-engine/page/2/#findComment-1021938 Share on other sites More sharing options...
mic Donating Members 1,725 Member For: 17y 5m 10d Gender: Male Posted 05/07/10 12:24 PM Share Posted 05/07/10 12:24 PM but another 1000cc for the ford, and on top of that its a strokey motor. lots of air being pushed out exaust valves with a stroke of 99mm. no one yet has dumped a sh*t load of cash on one of these things.... Link to comment https://www.fordxr6turbo.com/forum/topic/69196-gas-bmw-2jz-street-engine/page/2/#findComment-1021943 Share on other sites More sharing options...
mic Donating Members 1,725 Member For: 17y 5m 10d Gender: Male Posted 05/07/10 12:26 PM Share Posted 05/07/10 12:26 PM On 05/07/2010 at 12:10 PM, power_slide said: What is the general rpm limit for a straight 6? I know a v8 is somewhere around 7200 rpmAfter that the power gain is minimalprove it Link to comment https://www.fordxr6turbo.com/forum/topic/69196-gas-bmw-2jz-street-engine/page/2/#findComment-1021945 Share on other sites More sharing options...
SPIKO Gold Donating Members 1,924 Member For: 20y 2m 21d Gender: Male Posted 05/07/10 08:14 PM Author Share Posted 05/07/10 08:14 PM Be patient............ Alot of you underestimate the harmonics of the Barra 4.0L and it's possibilities, this will not be the case soon... Link to comment https://www.fordxr6turbo.com/forum/topic/69196-gas-bmw-2jz-street-engine/page/2/#findComment-1021993 Share on other sites More sharing options...
mic Donating Members 1,725 Member For: 17y 5m 10d Gender: Male Posted 06/07/10 04:28 AM Share Posted 06/07/10 04:28 AM I have always been a skyline/supra man, but these engines from ford are so good and have sooo much potential. its almost as if they have fluked it. every engine has a bad harmonic, that's why big performance costs $$$ Link to comment https://www.fordxr6turbo.com/forum/topic/69196-gas-bmw-2jz-street-engine/page/2/#findComment-1022089 Share on other sites More sharing options...
sexual harrassment panda I see a red door and I want to paint it black Donating Members 5,919 Member For: 15y 8m 3d Gender: Male Location: Far north queensland Posted 06/07/10 07:04 AM Share Posted 06/07/10 07:04 AM On 05/07/2010 at 12:01 PM, mic said: who says u need to exceed 8500 rpm ?? u think one of those 2j's would last forever at 11,000 rpm ?? 3.4 stroker supras have an rpm limit of 8500 also. or thereabouts dependidng on their confidence lol. rpm kills engines, esp piston engines....Yes but by changing the stroke they change the engine harmonics how the engine makes it's power.Read SPIKO's build thread, that should show you what's currently possible with our 4.0l straight 6. If the motor he is building won't rev it's tits off further and make more power than anyone else has I'll take a load to the face from peter north. Link to comment https://www.fordxr6turbo.com/forum/topic/69196-gas-bmw-2jz-street-engine/page/2/#findComment-1022123 Share on other sites More sharing options...
mic Donating Members 1,725 Member For: 17y 5m 10d Gender: Male Posted 06/07/10 07:26 AM Share Posted 06/07/10 07:26 AM hope we're not getting our wirs crossed here. what exactly are u trying to say mate ? Link to comment https://www.fordxr6turbo.com/forum/topic/69196-gas-bmw-2jz-street-engine/page/2/#findComment-1022127 Share on other sites More sharing options...
SPIKO Gold Donating Members 1,924 Member For: 20y 2m 21d Gender: Male Posted 06/07/10 07:46 AM Author Share Posted 06/07/10 07:46 AM On 06/07/2010 at 7:04 AM, sideways82 said: Yes but by changing the stroke they change the engine harmonics how the engine makes it's power.Read SPIKO's build thread, that should show you what's currently possible with our 4.0l straight 6. If the motor he is building won't rev it's tits off further and make more power than anyone else has I'll take a load to the face from peter north.LMAO Sideways I couldn't of said that better myself....... Link to comment https://www.fordxr6turbo.com/forum/topic/69196-gas-bmw-2jz-street-engine/page/2/#findComment-1022133 Share on other sites More sharing options...
bluprinturbo Donating Members 605 Member For: 17y 1m 17d Gender: Male Location: brisbane Posted 06/07/10 08:26 AM Share Posted 06/07/10 08:26 AM On 06/07/2010 at 7:04 AM, sideways82 said: Yes but by changing the stroke they change the engine harmonics how the engine makes it's power.Read SPIKO's build thread, that should show you what's currently possible with our 4.0l straight 6. If the motor he is building won't rev it's tits off further and make more power than anyone else has I'll take a load to the face from peter north.hahahahahah you must be very confident, and rightly so. Link to comment https://www.fordxr6turbo.com/forum/topic/69196-gas-bmw-2jz-street-engine/page/2/#findComment-1022149 Share on other sites More sharing options...
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