boost/vacuume gauge help

[Hacki_sack_kid]

i just got a boost/vacuume gauge from autometer, im wondering 2 things about it, when its idling (mine is set at 1000 to help the turbo) what reading should i get from it? currently im getting a 0, and its reading a max of 7 psi and i had the guy i got the turbo from set the waste gate at 8 or 8.5, anyway i was wondering if it was just a bad place that i put it or if i have a vacuume leak or a boost leak, any ideas? I put the boost gauge line in on hose #90999-92002 (L=200) off the throttle body.
http://cygnusx1.net/Supra/Library/EPC/291420/catalog.aspx?F=1708&P=3

 

[suprahero]

If you installed it and you're getting a 0 on vacuum, then you've installed it on a vacuum line with a one way valve. I don't know what they're called, but they will only let air go through it one way. You need to try a different vacuum line and see if that helps you.

As far as the boost goes, it's probably reading it correctly. You'll know for sure once you relocate it to another source.

 

[ms07s]

Suprahero is correct.

You should use the hose for the factory boost gauge sensor in the driver side strut mount area.

 

[suprahero]

Suprahero is correct.

If you only knew how long I've waited for someone to ask a question that I actually knew the answer too...........:biglaugh:

 

[isnms]

That hose is in front of the throttle plate. That's why you are not reading any vacuum at idle with throttle closed.

edit: try anywhere off of 88200B (No.1)
http://cygnusx1.net/Supra/TechTips/graphics/vacuum_3h.gif

 

[Nick M]

If you only knew how long I've waited for someone to ask a question that I actually knew the answer too...........:biglaugh:

Says the man with 9600 posts... :sarcasm:

For the original post, the amount of "boost" you will show on the gauge when stock is 5.5-7.5 with a manual trans.

Auto is slightly less from the torque converter slippage.

 

[suprahero]

9600 posts of pure nonsense, and only one answering a question...........:biglaugh:

 

[Rennat]

why is the OP idle at 1000 "to help the turbo"...??? nobody caught that??

 

[ms07s]

If you only knew how long I've waited for someone to ask a question that I actually knew the answer too...........:biglaugh:

Your welcome. For everything there is a first time.

 

[AGlobalThreat]

why is the OP idle at 1000 "to help the turbo"...??? nobody caught that??

Thats what I was wondering.

A 1000 rpm idle is unnecessary.

 

[92nsx]

You plumed you boost gauge to your BVSV.:biglaugh::kickinthenuts:
Try hooking it up to hose 17344C, or any other vac. hose

 

[Dunckel]

Please explain to me how you came to the conclusion that a 1k rpm idle helps the turbo. I'm not going to flame, I just want to know why you think that.

 

[Hacki_sack_kid]

Please explain to me how you came to the conclusion that a 1k rpm idle helps the turbo. I'm not going to flame, I just want to know why you think that.

from what i heard at least it helps it cool off faster, i shouldn't have said that it helps the turbo it helps me is what i meant, and as far as the other post saying that stock it is 4.5 to 7.5 this isn't a stock turbo, and like i said i had the guy put the spring in the wastegate to 8 psi.

 

[gaboonviper85]

Unless you run a standalone how the hell do you "set" idle rpm?? Isn't it ecu controled??

Factory idle is 6-700 rpm...300 more rpms isn't gonna help much...



Your doing it wrong....

 

[suprahero]

My car idles better @ 900-1000 rpm..............:dunno:

 

[Hacki_sack_kid]

Unless you run a standalone how the hell do you "set" idle rpm?? Isn't it ecu controled??

Factory idle is 6-700 rpm...300 more rpms isn't gonna help much...



Your doing it wrong....

there is a screw in the throttle body, you back it out and the idle increases, u screw it in and the idle decreases, as far as im concerned messing with the ecu with my knowledge of cars is a bad idea. rather than messing something up id rather leave it alone and i believe that the ecu controls the idle, raising it or lowering it depending on how hot the car is running and the screw just adjusts the rpm range it does it with but i don't know, this is my first car and i have no training in cars at all, im just making... uneducated guesses lol, so please set me straight if im wrong.

 

[Slow66]

My car idles better @ 900-1000 rpm..............:dunno:

You have bigger cams though....that changes everything

Oh, and Hack-i, don't make uneducated guesses. Educate yourself before you mess with things on the car. Since you know where to find the online TSRM, research where the idle should be for you're setup and put it there.

 

[jdub]

there is a screw in the throttle body, you back it out and the idle increases, u screw it in and the idle decreases, as far as im concerned messing with the ecu with my knowledge of cars is a bad idea. rather than messing something up id rather leave it alone and i believe that the ecu controls the idle, raising it or lowering it depending on how hot the car is running and the screw just adjusts the rpm range it does it with but i don't know, this is my first car and i have no training in cars at all, im just making... uneducated guesses lol, so please set me straight if im wrong.

This is a very bad idea...the screw on top of the TB is set from the factory full closed due to the reasons mentioned. It was removed from the '89+ motors because it's not necessary and people keep messing with it. You just opened up a pirate air source to the motor.

All you've done is cause the ISCV (controlled by the ECU) to step closed in a effort to bring idle down, effectively defeating an engine control. Screw it back in (all the way) and pull your EFI fuse for a minute so the ECU can re-learn idle.

 

[Hacki_sack_kid]

This is a very bad idea...the screw on top of the TB is set from the factory full closed due to the reasons mentioned. It was removed from the '89+ motors because it's not necessary and people keep messing with it. You just opened up a pirate air source to the motor.

All you've done is cause the ISCV (controlled by the ECU) to step closed in a effort to bring idle down, effectively defeating an engine control. Screw it back in (all the way) and pull your EFI fuse for a minute so the ECU can re-learn idle.

thanks for the info, one more little bit of info i would like to have for when i relocate the boost gauge lines what is a good reading to have for the vacuume, cuz i still don't know if i have a potential leak

 

[isnms]

http://www.users.bigpond.com/ergoff/vac1.htm