Aftermarket cam gears on 7m

bryanf89 · 01-24-2010, 02:05 PM

I recently purchase some adustable cam gears for the 7mgte engine. It goes all the way to -12 to +12. What does it mean if i go negative or postive and what does it influence?

gteduck · 01-24-2010, 05:21 PM

It will alter where your power is made in the rev range.
the higher that is the more HP, BUT it will take longer before it tries to separate your head from your shoulders. I'm not sure if u can do it with a factory EMS ???
if you do it , get it done properly, otherwise you might end up with a big ass paperweight .

bryanf89 · 01-24-2010, 09:05 PM

im still not clear about it...can u give me an in depth explanation

gteduck · 01-25-2010, 02:10 AM

the cam gear basically advances or retards the timing on the cam ( opens the inlet valves earlier or later in the engine cycle ) this inturn will give you power lower or higer in the rev range, depending if you move it to the plus or minus side on the gear. zero is standard timing. it can be a simple way to gain power,but there are trade offs. I had mine done when i first put the 7mgte in my mk2. BUT i have a microtech EMS witch was tuned on a dyno via a laptop. it let the engine rev out more giving me about 274whp , great on open roads but annoying in traffic. At low rpm in traffic it was not as smooth. It tended to surge a bit while holding accelerator steady. No problem on the gas ,or of it ! But i was always in traffic going to and from work so it got annoying . So next time i had it serviced i had them set it back to fairly standard timing, witch dropped my power to 234whp. still running 15 pd boost with both tunes. but made it alot smoother at low steady revs .

bryanf89 · 01-25-2010, 02:18 AM

so turning towards a positive range will advance my timing allowing more power in higher rpm's but not allowing a smooth engine timing in lower steadier rpm's? I'm assuming turning it towards the negative range will retard my timing allowing more power in lower rpm's to allow quicker acceleration but losing out on top speed?

gteduck · 01-25-2010, 02:30 AM

I'm not sure if this is possible with a Factory EMS cause i never had one on this particular engine. If u find a mechanic that can do it for you , he should know if its possible. whatever you do don't just slap it on by yourself and hope it works. It just might do more harm than good. have you done your gasket and put in arp head studs yet? i had mine done by a friend who tunes hi performance turbo cars for a living. it does make the car go hard thou when done right. You'll have a smile on your face for a month. till u get used to it ,then you'll want more.

hope it helps!

bryanf89 · 01-25-2010, 02:44 AM

Is my conclusion on cam timing correct? y wouldnt it be possible on the stock EMS? my mechanic is well known in the field he could take a car apart and put it back together lol.
by the way what does ems stand for...i heard of the ECU but EMS? i know it cant be electronic modulated suspension lol

honestly i dont know if the car got a new gasket or head struts. i bought the car from a guy that worked in a dealership and he said he set the turbo to 12psi im sure he changed the head gasket at the very least unless he wasnt pushing it

gteduck · 01-25-2010, 02:49 AM

Quote:

Originally Posted by bryanf89

so turning towards a positive range will advance my timing allowing more power in higher rpm's but not allowing a smooth engine timing in lower steadier rpm's? I'm assuming turning it towards the negative range will retard my timing allowing more power in lower rpm's to allow quicker acceleration but losing out on top speed?

it's the other way, advance for low end and retard for top end. retarding it lets it rev higher than you normally would be able to, you can tell the differance quite easy once you drive it , i loved holding it at about 3000 rpm in third and then bury my foot . My diff is a 4.1 so it really would launch hard and the extra revs meant i didn't have to shift as early. IT WAS FUN!!!!

gteduck · 01-25-2010, 03:04 AM

EMS = engine management system, the little computer or box that controls the injectors and look's after firing the plugs, you air fuel mixture ,all that sort of crap. you know the shit that makes it go! LOL
i'm not sure if the mapping needs to be altered that's all maybe you should ask your mechanic. Im only a dumbass engineer!!! lol
i can machine an engine ,assemble an engine, but i'm the last prick you want to tune your engine!!!! LOL

bryanf89 · 01-25-2010, 03:17 AM

ok gteduck let me see if i got this correct....tuning the cam to a positive range will retard my timing allowing my engine to achieve higher rpm thus producing more hp in higher gears but the trade off is not having smooth timing on low steady rpm and tuning my cams to the negative range will my advance my timing allowing for quicker acceleration in lower gears but losing out on top speed and power in higher gears...is my knowledge on this correct?

lol if there was thing i want to do to my supra is definatly rebuild the engine give that baby a new heart a modified heart that is

lol

01-24-2010, 02:05 PM	#1
bryanf89 3" Exhaust Join Date: Nov 2009 Location: NYC Posts: 231	Aftermarket cam gears on 7m I recently purchase some adustable cam gears for the 7mgte engine. It goes all the way to -12 to +12. What does it mean if i go negative or postive and what does it influence?

01-25-2010, 02:44 AM	#7
bryanf89 3" Exhaust Join Date: Nov 2009 Location: NYC Posts: 231	Is my conclusion on cam timing correct? y wouldnt it be possible on the stock EMS? my mechanic is well known in the field he could take a car apart and put it back together lol. by the way what does ems stand for...i heard of the ECU but EMS? i know it cant be electronic modulated suspension lol honestly i dont know if the car got a new gasket or head struts. i bought the car from a guy that worked in a dealership and he said he set the turbo to 12psi im sure he changed the head gasket at the very least unless he wasnt pushing it Last edited by bryanf89; 01-25-2010 at 02:46 AM. Reason: forgot to mention

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01-24-2010, 05:21 PM	#2
gteduck Intake Join Date: Jan 2010 Location: melbourne,australia Posts: 31	It will alter where your power is made in the rev range. the higher that is the more HP, BUT it will take longer before it tries to separate your head from your shoulders. I'm not sure if u can do it with a factory EMS ??? if you do it , get it done properly, otherwise you might end up with a big ass paperweight .

01-24-2010, 09:05 PM	#3
bryanf89 3" Exhaust Join Date: Nov 2009 Location: NYC Posts: 231	im still not clear about it...can u give me an in depth explanation

01-25-2010, 02:10 AM	#4
gteduck Intake Join Date: Jan 2010 Location: melbourne,australia Posts: 31	the cam gear basically advances or retards the timing on the cam ( opens the inlet valves earlier or later in the engine cycle ) this inturn will give you power lower or higer in the rev range, depending if you move it to the plus or minus side on the gear. zero is standard timing. it can be a simple way to gain power,but there are trade offs. I had mine done when i first put the 7mgte in my mk2. BUT i have a microtech EMS witch was tuned on a dyno via a laptop. it let the engine rev out more giving me about 274whp , great on open roads but annoying in traffic. At low rpm in traffic it was not as smooth. It tended to surge a bit while holding accelerator steady. No problem on the gas ,or of it ! But i was always in traffic going to and from work so it got annoying . So next time i had it serviced i had them set it back to fairly standard timing, witch dropped my power to 234whp. still running 15 pd boost with both tunes. but made it alot smoother at low steady revs .

01-25-2010, 02:18 AM	#5
bryanf89 3" Exhaust Join Date: Nov 2009 Location: NYC Posts: 231	so turning towards a positive range will advance my timing allowing more power in higher rpm's but not allowing a smooth engine timing in lower steadier rpm's? I'm assuming turning it towards the negative range will retard my timing allowing more power in lower rpm's to allow quicker acceleration but losing out on top speed?

01-25-2010, 02:30 AM	#6
gteduck Intake Join Date: Jan 2010 Location: melbourne,australia Posts: 31	I'm not sure if this is possible with a Factory EMS cause i never had one on this particular engine. If u find a mechanic that can do it for you , he should know if its possible. whatever you do don't just slap it on by yourself and hope it works. It just might do more harm than good. have you done your gasket and put in arp head studs yet? i had mine done by a friend who tunes hi performance turbo cars for a living. it does make the car go hard thou when done right. You'll have a smile on your face for a month. till u get used to it ,then you'll want more. hope it helps!

01-25-2010, 03:04 AM	#9
gteduck Intake Join Date: Jan 2010 Location: melbourne,australia Posts: 31	EMS = engine management system, the little computer or box that controls the injectors and look's after firing the plugs, you air fuel mixture ,all that sort of crap. you know the shit that makes it go! LOL i'm not sure if the mapping needs to be altered that's all maybe you should ask your mechanic. Im only a dumbass engineer!!! lol i can machine an engine ,assemble an engine, but i'm the last prick you want to tune your engine!!!! LOL

01-25-2010, 03:17 AM	#10
bryanf89 3" Exhaust Join Date: Nov 2009 Location: NYC Posts: 231	ok gteduck let me see if i got this correct....tuning the cam to a positive range will retard my timing allowing my engine to achieve higher rpm thus producing more hp in higher gears but the trade off is not having smooth timing on low steady rpm and tuning my cams to the negative range will my advance my timing allowing for quicker acceleration in lower gears but losing out on top speed and power in higher gears...is my knowledge on this correct? lol if there was thing i want to do to my supra is definatly rebuild the engine give that baby a new heart a modified heart that is lol