re: disabling supercharger

jimb · 08-27-2008, 12:20 AM

I know this may sound dumb, after you want power but... with current gas prices, it would be nice to have more control of when you use lots of gas.

If one were to put a switch in-line with the supercharger clutch wire disabling the supercharger, would it create any problems for the system?
I suppose it would generate/show an engine fault but other than that, would it be/cause a problem.

Doing this you can stay out of boost when your in city traffic, and can re-enable it when you want it, not when the car want's it.

Thanks,
Jim

F0Bman · 08-27-2008, 01:05 AM

You can disable the supercharger but that won't help much if you don't reduce your fueling.

jimb · 08-27-2008, 01:10 AM

how do you mean fueling?
I would expect the ECM to continue monitoring the MAP sensor/intake pressure and without the supercharged airflow, keep injecting based on the resulting unsuperchared numbers?
Course that's what I'd expect and I've been known to be wrong on more than one occasion.

Thanks,
Jim

Juiced N Blown · 11-02-2008, 03:17 PM

why don't you just unplug the supercharger if your concerned about gas?

MR2 Drifter · 11-02-2008, 08:04 PM

The only thing I can think of is messing with the ECU with a piggyback or something and tune the fuel air ratio down

I thought the supercharger always had to be on when the car was on though? I never heard of anyone setting it so it can go on and off

And what gas prices? gas has gone WAY down since $4 a gallon
now its around $2.50 -$3.00 a gallon

Angus · 11-02-2008, 11:21 PM

Quote:

Originally Posted by jimb

I know this may sound dumb, after you want power but... with current gas prices, it would be nice to have more control of when you use lots of gas.

If one were to put a switch in-line with the supercharger clutch wire disabling the supercharger, would it create any problems for the system?
I suppose it would generate/show an engine fault but other than that, would it be/cause a problem.

Doing this you can stay out of boost when your in city traffic, and can re-enable it when you want it, not when the car want's it.

Thanks,
Jim

i heard about a guy that used his power/economy AC buttons to activate and disconnect the electronmagnetic clutch on his SC, but he said it ran like such a dog.

why don't you just try and drive around without the SC led coming on ?

im running 11.5psi on my 4agze and can still get 30mpg if im careful

tech2 · 11-04-2008, 12:58 PM

The reason this is a cool idea is less about saving fuel and more about living a Mad Max fantasy I've had since I first saw the The Road Warrior.

Angus · 11-04-2008, 10:12 PM

Quote:

Originally Posted by tech2

The reason this is a cool idea is less about saving fuel and more about living a Mad Max fantasy I've had since I first the The Road Warrior.

now that, i can understand !

yoshimitsuspeed · 03-17-2009, 04:43 AM

Quote:

Originally Posted by jimb

I know this may sound dumb, after you want power but... with current gas prices, it would be nice to have more control of when you use lots of gas.

If one were to put a switch in-line with the supercharger clutch wire disabling the supercharger, would it create any problems for the system?
I suppose it would generate/show an engine fault but other than that, would it be/cause a problem.

Doing this you can stay out of boost when your in city traffic, and can re-enable it when you want it, not when the car want's it.

Thanks,
Jim

I just converted my GZE to turbo in a 2 stage process. The first stage eliminated the SC and I drove it NA for a couple months like that. I calculated my mpg and it was to close to compare between normal boosted driving and NA. I might have gotten 1 or 2 mpg better on a long road trip but nothing to write home about. I found without the SC my foot spent a lot more time on the floor just to get it's slow ass moving. Let me tell you 1.6 liters with low comp and no boost is a dog. Compare it to the super econo civic on accel but still only half the mpg. I wouldn't bother. The car is designed for boost. The compression is designed for boost and from what I found it's happiest that way.
Just drive nice and baby the pedal. Smooth inputs have a huge effect, easy on easy off, that kind of stuff.

como · 03-19-2009, 09:06 AM

I, too, want to know- because Mad Max is my hero, and I want that switch in my car, too.

toyotaspeed90 · 03-25-2009, 10:25 PM

Ugh.....

Nobody pays attention. The s/c's can get good gas mileage because you're usually in vacuum at cruising speeds/loads on the engine.... when it starts to boost you will start using more fuel.

The ecu is designed to work in conjunction with the s/c. I would assume it would not know if the s/c is on or not. IF you want to save fuel the key would be to trick the ecu into knowing the s/c is off when you have it turned off.

On my 87 with a gze on Megasquirt I have the s/c on it's own relay and switch. I haven't driven it much since I got this car back and threw the ae92 motor in (with 101 s/c stuff)... but long ago when I had it running in it's prime it got (wasn't tuned) 14mpg with the s/c on and 40+ with it off. Def. slow to drive with the s/c off.

Another thing you might want to consider is using a C series transmission. Much lighter, will make the car more nimble, and better gear ratios... all = better gas mileage.

mr2tim · 03-26-2009, 05:11 PM

Quote:

Originally Posted by toyotaspeed90

Ugh.....

Nobody pays attention. The s/c's can get good gas mileage because you're usually in vacuum at cruising speeds/loads on the engine.... when it starts to boost you will start using more fuel.

The ecu is designed to work in conjunction with the s/c. I would assume it would not know if the s/c is on or not. IF you want to save fuel the key would be to trick the ecu into knowing the s/c is off when you have it turned off.

On my 87 with a gze on Megasquirt I have the s/c on it's own relay and switch. I haven't driven it much since I got this car back and threw the ae92 motor in (with 101 s/c stuff)... but long ago when I had it running in it's prime it got (wasn't tuned) 14mpg with the s/c on and 40+ with it off. Def. slow to drive with the s/c off.

Another thing you might want to consider is using a C series transmission. Much lighter, will make the car more nimble, and better gear ratios... all = better gas mileage.

mr2tim · 03-26-2009, 09:21 PM

To see if you like the non-supercharging effect unplug the supercharger relay on the right side of the ECU, that's all it will take. It will not explode the engine, nor damage any components, I have done this on occasion.

Should you decide to proceed after a trial period then add a switch, connect to the two wire lead going to the supercharger at the eletromagnetic, all you need to do is switch either wire to break the electricity circuit, your choice

Remember, the 4a-gze egine is a 8:1 compression engine, the N/A engines are 9.5:1. That's a difference of 1.5 DOWNWARDS in performance, like 16% LESS.
Yes, it's also 16% more economical.

Please keep us Club Website folks up to date on your impressions and results, we are all curious about your results in these "green" days of saving the planet vs 550hp Cadillacs?

19 year S/C driver and competitor

8589 · 09-20-2009, 03:10 PM

Just did the switch, from 27.5 to 31.5 highway 60-80 MPH (90% highway)

could be me, but appear that city driving bring more temp to engine = no like SC off = be careful if modded on city driving, I don't do much city so don't quote me (yes is doggy, like someone say has to do with compression ratio)
Is good also if "someone else's" has to drive car

if it get stolen they will dump it around the corner LOL....LOL
also good for teaching that special someone to do stick shift (car is so smooth is even pleasant at times)

Jackstand Queen · 09-21-2009, 12:23 PM

Yeah, I like what 8589 said. Put the switch for the SC in there somewhere hidden. Then when you hand the car over to a valet parking attendant, or your best friend . . . turn the SC off.

When your friend says "I couldn't get it to go good". Just tell him that he lacks the advanced driving skills needed to make this SC car get up and go.

I think I will installing a secret SC switch on my car quite soon.

mcmr2 · 09-27-2009, 03:04 PM

Thanks for the update 8589! So where did you put the switch and which wires did you put it on?

goldluderay · 09-29-2009, 04:58 PM

im thinking about running a push button switch at the base of the gas pedal this way the only time my s/c will kick on is at complete wot,,,,, im thinking about useing this set-up with a nst pulley along with a afc - wideband street tune

8589 · 09-29-2009, 05:25 PM

Quote:

Originally Posted by mcmr2

Thanks for the update 8589! So where did you put the switch and which wires did you put it on?

toggle switch for dummies (like me)
pull off pigtail by SC, find dead/negative wire of the two (odly, mine was the red not the black) you don't want to run power all the time to the switch.

splice negative, attach double wire, and run double wire toward the cockpit via big hole beneath wall carpet behind driver seat again via floor board/door sill and U R right at baby quarter panel that conceal fuse box, pull apart baby panel (ease one nut) and is plenty of room there to install switch (very soft plastic ease to make hole even w/o drill)

I DID WASTE TIME WITH DASHBOARD. I Spend an hour putting brittle things back. No room /not worth it

Do not buy Walmart type PLASTIC THREE WAY TOGGLE, (I did) will fail at thread/nut on installation,,delaaay.. and if you guess is not right you have to pull panel apart again..more delaaay buy METAL TWO WAY toggle

If U already have some double wire and some ol shiet around the house this mod goes from zero to 10 bucks

IF is not clear: SC has TWO wires, you run ONE of them to switch.

8589 · 09-29-2009, 05:33 PM

UPDATE

i HATE PLACEBO ON THE WEB, few fill ups gave a 29.5 instead of original 31.5 so went from 27.5 to 29.5..I apologize for rushing to post after only one fill up

(never did the TS to gain MPG)

Jackstand Queen · 09-30-2009, 12:21 AM

Make sure this SC manual cutoff switch uses the ground wire of the the SC clutch.

The ECU controls the SC's electrical switch via the SC relay. And you do not want to mess with the ECU's operation of the SC.

I wouldn't recommend turning this DYI switch while the car is running at high speed, throttle on. But only at idle, or when the engine is not running.

Using this switch to squeeze another MPG out of the car is anal retentive. Using this switch as an Anti-Idiot Countermeasure makes perfect sense to me.

08-27-2008, 12:20 AM	#1 (permalink)
jimb No Skills Join Date: Aug 2008 Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	re: disabling supercharger I know this may sound dumb, after you want power but... with current gas prices, it would be nice to have more control of when you use lots of gas. If one were to put a switch in-line with the supercharger clutch wire disabling the supercharger, would it create any problems for the system? I suppose it would generate/show an engine fault but other than that, would it be/cause a problem. Doing this you can stay out of boost when your in city traffic, and can re-enable it when you want it, not when the car want's it. Thanks, Jim

11-04-2008, 12:58 PM	#7 (permalink)
tech2 Some Skills Join Date: Jun 2006 Posts: 74 Thanks: 5 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	The reason this is a cool idea is less about saving fuel and more about living a Mad Max fantasy I've had since I first saw the The Road Warrior. Last edited by tech2; 11-04-2008 at 10:37 PM.

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08-27-2008, 01:05 AM	#2 (permalink)
F0Bman Cage Fighter Join Date: Mar 2008 Posts: 257 Thanks: 0 Thanked 3 Times in 3 Posts iTrader Rating: (0/0% )	You can disable the supercharger but that won't help much if you don't reduce your fueling.

08-27-2008, 01:10 AM	#3 (permalink)
jimb No Skills Join Date: Aug 2008 Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	how do you mean fueling? I would expect the ECM to continue monitoring the MAP sensor/intake pressure and without the supercharged airflow, keep injecting based on the resulting unsuperchared numbers? Course that's what I'd expect and I've been known to be wrong on more than one occasion. Thanks, Jim

11-02-2008, 03:17 PM	#4 (permalink)
Juiced N Blown No Skills Join Date: Nov 2008 Posts: 6 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	why don't you just unplug the supercharger if your concerned about gas?

11-02-2008, 08:04 PM	#5 (permalink)
MR2 Drifter No Drifting Skills Join Date: Jun 2008 Location: Chicago Posts: 956 Thanks: 3 Thanked 16 Times in 16 Posts iTrader Rating: (2/100% )	The only thing I can think of is messing with the ECU with a piggyback or something and tune the fuel air ratio down I thought the supercharger always had to be on when the car was on though? I never heard of anyone setting it so it can go on and off And what gas prices? gas has gone WAY down since $4 a gallon now its around $2.50 -$3.00 a gallon

03-19-2009, 09:06 AM	#10 (permalink)
como Road Warrior Join Date: Jan 2009 Location: Southern Maine Posts: 519 Thanks: 13 Thanked 8 Times in 7 Posts iTrader Rating: (2/100% )	I, too, want to know- because Mad Max is my hero, and I want that switch in my car, too.

03-25-2009, 10:25 PM	#11 (permalink)
toyotaspeed90 No Skills Join Date: Jun 2006 Location: Bellingham, WA Posts: 422 Thanks: 0 Thanked 32 Times in 32 Posts My Google Map iTrader Rating: (0/0% )	Ugh..... Nobody pays attention. The s/c's can get good gas mileage because you're usually in vacuum at cruising speeds/loads on the engine.... when it starts to boost you will start using more fuel. The ecu is designed to work in conjunction with the s/c. I would assume it would not know if the s/c is on or not. IF you want to save fuel the key would be to trick the ecu into knowing the s/c is off when you have it turned off. On my 87 with a gze on Megasquirt I have the s/c on it's own relay and switch. I haven't driven it much since I got this car back and threw the ae92 motor in (with 101 s/c stuff)... but long ago when I had it running in it's prime it got (wasn't tuned) 14mpg with the s/c on and 40+ with it off. Def. slow to drive with the s/c off. Another thing you might want to consider is using a C series transmission. Much lighter, will make the car more nimble, and better gear ratios... all = better gas mileage.

03-26-2009, 09:21 PM	#13 (permalink)
mr2tim SUPERcharZed ToyZ RacZer Join Date: Mar 2008 Location: South Florida Posts: 690 Thanks: 2 Thanked 41 Times in 38 Posts My Google Map iTrader Rating: (2/100% )	To see if you like the non-supercharging effect unplug the supercharger relay on the right side of the ECU, that's all it will take. It will not explode the engine, nor damage any components, I have done this on occasion. Should you decide to proceed after a trial period then add a switch, connect to the two wire lead going to the supercharger at the eletromagnetic, all you need to do is switch either wire to break the electricity circuit, your choice Remember, the 4a-gze egine is a 8:1 compression engine, the N/A engines are 9.5:1. That's a difference of 1.5 DOWNWARDS in performance, like 16% LESS. Yes, it's also 16% more economical. Please keep us Club Website folks up to date on your impressions and results, we are all curious about your results in these "green" days of saving the planet vs 550hp Cadillacs? 19 year S/C driver and competitor

09-20-2009, 03:10 PM	#14 (permalink)
8589 No Skills Join Date: Mar 2009 Location: Florida Posts: 43 Thanks: 2 Thanked 2 Times in 2 Posts iTrader Rating: (0/0% )	Just did the switch, from 27.5 to 31.5 highway 60-80 MPH (90% highway) could be me, but appear that city driving bring more temp to engine = no like SC off = be careful if modded on city driving, I don't do much city so don't quote me (yes is doggy, like someone say has to do with compression ratio) Is good also if "someone else's" has to drive car if it get stolen they will dump it around the corner LOL....LOL also good for teaching that special someone to do stick shift (car is so smooth is even pleasant at times)

09-21-2009, 12:23 PM	#15 (permalink)
Jackstand Queen Cage Fighter Join Date: May 2008 Posts: 677 Thanks: 52 Thanked 56 Times in 53 Posts iTrader Rating: (1/100% )	Yeah, I like what 8589 said. Put the switch for the SC in there somewhere hidden. Then when you hand the car over to a valet parking attendant, or your best friend . . . turn the SC off. When your friend says "I couldn't get it to go good". Just tell him that he lacks the advanced driving skills needed to make this SC car get up and go. I think I will installing a secret SC switch on my car quite soon.

09-27-2009, 03:04 PM	#16 (permalink)
mcmr2 Some Skills Join Date: Oct 2006 Location: atlanta, ga Posts: 67 Thanks: 1 Thanked 1 Time in 1 Post iTrader Rating: (0/0% )	Thanks for the update 8589! So where did you put the switch and which wires did you put it on?

09-29-2009, 04:58 PM	#17 (permalink)
goldluderay No Skills Join Date: Nov 2007 Posts: 38 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	im thinking about running a push button switch at the base of the gas pedal this way the only time my s/c will kick on is at complete wot,,,,, im thinking about useing this set-up with a nst pulley along with a afc - wideband street tune

09-29-2009, 05:33 PM	#19 (permalink)
8589 No Skills Join Date: Mar 2009 Location: Florida Posts: 43 Thanks: 2 Thanked 2 Times in 2 Posts iTrader Rating: (0/0% )	UPDATE i HATE PLACEBO ON THE WEB, few fill ups gave a 29.5 instead of original 31.5 so went from 27.5 to 29.5..I apologize for rushing to post after only one fill up (never did the TS to gain MPG)

09-30-2009, 12:21 AM	#20 (permalink)
Jackstand Queen Cage Fighter Join Date: May 2008 Posts: 677 Thanks: 52 Thanked 56 Times in 53 Posts iTrader Rating: (1/100% )	Make sure this SC manual cutoff switch uses the ground wire of the the SC clutch. The ECU controls the SC's electrical switch via the SC relay. And you do not want to mess with the ECU's operation of the SC. I wouldn't recommend turning this DYI switch while the car is running at high speed, throttle on. But only at idle, or when the engine is not running. Using this switch to squeeze another MPG out of the car is anal retentive. Using this switch as an Anti-Idiot Countermeasure makes perfect sense to me.