my 7mgte at 10psi air fuel? and possible max boost? mod list

[7m3sgte]

hello my first post on here i love the forums so far have found all info i need ty everyone.. but i have some questions if anyone knows..
anyone know the stock air fuel ratio of a 7m at about 10 psi?
10.0 a/f under boost 14 when idle sound alright? the sensor is installed at the bottem of the dp. i dont know it will make a differences being down there instead of at the turbo?
its in a 87 supra.. i think the later gen swapped into it.
heres my mods

new huge fmic and plumbing, blow off (my intake stays ice cold at 10 psi)
full 3" straight pipe exhaust
no idle control
mls hg unknown thickness original from cometic torqued down 75 pounds
alot has been deleted under the hood
anyone think a few more psi is ok? or have any opinions on it? please lol?
thanks.

 

[bioskyline]

more info. stock turbo? stock injectors? has the fuel system been upgraded?

 

[7m3sgte]

yup as far as i know thats all the mods that are done to it.. its been running at 10 psi since i got it. no boost controller. from what im understanding is no more boost untill Lexus SC400 V8 afm and 550cc fuel injectors? it dont feel to be pulling hard as it should but im not sure what it should feel like.. im used to a fwd celica 3sgte at 15 psi burning tires through 3rd. i hook after first with the supra

 

[bioskyline]

big difference between a supra and a celica, rwd vs fwd, and the supra is alot heavier. with the stock fuel system 12 psi is about max, and even then your on the verge of fuel cut.

 

[Nick M]

Even at 10 psi, you will still be very rich. Apples to oranges, with the 57 Boss Jr and 550's, I am 9.8:1 at 10 psi. They Toyota program is quite rich, which is needed to cool the charge of a boosted engine.

 

[grimreaper]

something else to consider, af ratios should not be dialed in based on boost. You can run it as lean as the motor will take based on the variables of your setup. Just make sure you understand what and how those variables will effect the motor. Timing, octane, charge cooling, turbo efficiency, load, temp etc...

 

[enjoi.this]

If you read the instructions on the wideband kit it tells you to mount the wide band O2 sensor 12-16 inches from the turbo so your install is correct.

If your still on the stock CT26 and fuel system, you will be limited buy fuel cut. 10-12 psi give or take will be your max psi.

 

[Nick M]

something else to consider, af ratios should not be dialed in based on boost. You can run it as lean as the motor will take based on the variables of your setup. ...

Correction factors are just that. They are minor corrections to the main input, which is airflow and engine speed.

 

[7m3sgte]

think i just had a boost leak.. did a few pulls today after moving some plumbing around also put some better clamps on. she idles better and pulling harder.. i was showing off lol.. not really watching the wideband because its down in the ashtray but i think it should be all good.. i will check on that tomorrow when i take it out again. thanks for the replys though i have gained some usefull info. next i will upgrade to lexus afm and upgrade fuel system when im ready for more and have some extra money.

 

[enjoi.this]

7M's really come alive with the lex/550/safc mods. getter done and enjoi :icon_razz

 

[dubsupra209]

on stock fuel system 10.0 a/f sounds rights to me!

mine was 10.2 at 9 psi

---------- Post added at 11:44 AM ---------- Previous post was at 11:43 AM ----------

you should really go maf pro i had a neo and it sucked didn't lean it out as much as i wanted...

now i got maf pro not installed yet

 

[7m3sgte]

checked the wideband today doing a few big pulls i got a steady 10.9 at about 9.5-10 psi.

 

[dubsupra209]

checked the wideband today doing a few big pulls i got a steady 10.9 at about 9.5-10 psi.

you could still lean it out more to like 11.5 maybe