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Joined: Oct 2003
Posts: 3,038
Clos
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Clos Sep 8, 5:02am - #269436 
2000 Spectra Blue Toyota Celica
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2000 Toyota Celica

Joined: Oct 2003
Posts: 3,038
Alexandria, VA
lucky if you see this click on it

okay i have a question, i showed the video of you shifting at 8,600 rpm to a friend, and he asked me how come you do that, he was wondering if our engines still make power after red line, he said something like the engines should stop producing hp wen they reach the red line, is this true or false?
Joined: Oct 2003
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Clos
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Clos Sep 8, 5:03am - #269437 
2000 Spectra Blue Toyota Celica
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2000 Toyota Celica

Joined: Oct 2003
Posts: 3,038
Alexandria, VA
anyone else thats knows about this can help 2
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VSGTS14
05 WRB
VSGTS14 Sep 8, 5:03am - #269438 

05 WRB
2005 Subaru WRX STi

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Milford, NJ
well he prob played with that power fc and made his engine go nutz

SUBARU TECNICA INTERNATIONAL
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genax
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genax Sep 8, 6:16am - #269439 
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2001 Toyota Celica GT

Joined: Oct 2003
Posts: 41
425,253
you canmake power with proper tuning butwhy risk bending a valve?

lifehappensevenwhileyourplanning
Joined: May 2003
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spaztikid
dikitzaps
spaztikid Sep 8, 6:19am - #269440 
dikitzaps
1974 Toyota Celica

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Posts: 5,346
LA
power FC allows different maps to be made... allowing more power to be made at higher rpm's.
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Haulin_A_Doo
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Haulin_A_Doo Sep 8, 7:17am - #269441 
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Posts: 2,016
Ontario
Revs are limited by a computer, not because the engine can't make horse power above redline, but because the motor will not take the extreem punishment. As soon as you remove the rev limiter using power FC, even without tuning, the GTS will make power all the way past 9,000.
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Elec-FuYu
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Elec-FuYu Sep 8, 7:27am - #269442 
2003 Silver Toyota Celica
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2003 Toyota Celica

Joined: May 2003
Posts: 2,454
B.C. Coquitlam
" he said something like the engines should stop producing hp wen they reach the red line, is this true or false? "

true, to honda engines.

our GTS engine makes power till about 8600rpm (where redline is at 7800rpm). then it start to drop, but maintaining an average of 160whp until 9000rpm (where the cams, valves starts to vibrate, causing unstableness)

where as the vtec engines stops making power after redline (the cams, valves starts to vibrate, causing unstableness even b4 redline). the car actually slows down when you pull longer on a gear over redline.

this is on engine with STOCK blocks, cams, valves. Modded ECU is to be used to go pass redline. but the hardware of the eninge is remained STOCK.

there it shows the difference of the limits of the two engine.

I am a HID Maniac!!
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Illusive
Member
Illusive Sep 8, 8:22pm - #269443 
Member

Joined: Nov 2002
Posts: 396
Southern California
holy moly thats a lot of incorrect information spineyes

basically the engine stops making power at around 8200 rpms.

when anyone finds a gts N/A that makes power to 9K rpms let me know wink

the next question,
why shift at 8600.
simple answer =lift
complex answer= in order to get the best possible acceleration you want to stay on the highest curve in the powerpand, on our cars with tuning on the pfc we can make peak power at 8200 rpms, but only loose about 5whp by 8600 rpms, if one were to shift at 8200 rpms (and still land in lift) you would be making less horse power at 6000-6500 rpms than if you held the gear till 8600 and then shifted and landed around 6600 rpms.
at 8600 rpms on our cars the engine makes the same power at 6600 rpms therefore that is the idea "sweat spot" you want to stay in for maximum acceleration.
gearing and tire size play a role in the shift point also, you do not want to shift 4th at 8600 rpms because 4th gear is so (numerically shorter) than 3rd gear, when you up shift 4th gear at 8600 rpms you rpms drop to about 68-6900 rpms, this would hinder acceleration because the sweet spot is right at 6600, so you would need to upshift 4th gear around 8200 rpms in order to stay in the engines sweet spot.

this is all with the apexi power FC of course.

btw tell your friend hes a tool, and redline doesn't mean the engine stops making power after that point, manufacturers put that there to stop the average idiot from blowing his engine(which is also why rev limiters are installed on production vehicles)

Controlled Inertia
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8.831 @ 79.8 mph (best 1/8 new motor 12/02/04)
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