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1G double check on safe psi for 1993 auto

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enriquez2000

Proven Member
2,268
806
Oct 5, 2014
fort collins, Colorado
Before being told to look, i have been reading and im seeing for basically stock set up it is safe to run around 15psi. I just want to verify that before I start turning it up. With my boost gauge in Im seeing 11psi now. Only thing I am unsure of is that since the auto awd cars have 390cc injectors I wasnt sure if they would deliver proper fuel. Right now the car is unmolested other than the addition of the gauge and a k/n filter.
 
Short answer: leave it at stock boost.

Every car is different and there are far too many variables for us to give you concrete answer. The condition of your fuel pump, your fuel filter, the individual injector flow rate, the vehicle's compression, etc. are just a couple factors.

Even on stock boost 450cc injectors can tap out and you'll hit fuel cut.

Do it right and get larger injectors and a higher flowing fuel pump along with a way to tune it.
 
Short answer: leave it at stock boost.



Do it right and get larger injectors and a higher flowing fuel pump along with a way to tune it.

All that is in the works... all maintenance is on point and motor is good to go. Spent the last month going over it all. This is a daily so I dont want to go crazy with it any way. With all the reading I see its supposedly safe to hit 14 or 15psi, but maybe not.. thats why Im asking before I just turn it up. I do understand the need to tune and datalog, I have an insanely high horsepower Honda(700+) with all the monitoring you could imagine.[DOUBLEPOST=1416845269][/DOUBLEPOST]That being said my long term plan is..

dsmlink
550cc injectors
walboro 255 fuel pump
wideband 02

of course exhaust will be upgraded and a FMIC. eventually maybe even a 16g turbo. But dsm link is first on my list. After having full control over my honda, its hard to not have the same here.
 
Without a wideband 02 sensor and something to tune with like ecmlink, aem or at least a safc2 or MAF Translator gen2 pro , you are relying on the factory ecu programming and the MAF sensors abilities. The factory ECU programming and the factory MAF sensor "may" be able to compensate for a small increase in boost like 14 or 15psi , but your only asking for trouble. Plus the gain in power from just turning the boost up a couple psi on a stock setup, you will not "feel" much of a difference. You can turn the boost up and it "may" run correctly somewhat but it probably wont. So don't even mess with it until you get something to tune with. The main point is that the ECU is programmed for the stock boost pressure. Anything outside of that setting +or- a phew, it is not correct and the engine is not running precisely. t Actually it will probably hurt your performance more than helping , again its probably not enough to "notice" or "feel".


Your long term plan is good but you also have more options. Like a Apexi safc2 and MAF Translater Gen2 Pro. They can fool the ecu so you can tune for higher boost and bigger turbos and such. But the best is a standalone, an actual programmable ecu like Ecmlink or AEM.
 
Without a wideband 02 sensor and something to tune with like ecmlink, aem or at least a safc2 or MAF Translator gen2 pro , you are relying on the factory ecu programming and the MAF sensors abilities. The factory ECU programming and the factory MAF sensor "may" be able to compensate for a small increase in boost like 14 or 15psi , but your only asking for trouble. Plus the gain in power from just turning the boost up a couple psi on a stock setup, you will not "feel" much of a difference. You can turn the boost up and it "may" run correctly somewhat but it probably wont. So don't even mess with it until you get something to tune with. The main point is that the ECU is programmed for the stock boost pressure. Anything outside of that setting +or- a phew, it is not correct and the engine is not running precisely. t Actually it will probably hurt your performance more than helping , again its probably not enough to "notice" or "feel".


Your long term plan is good but you also have more options. Like a Apexi safc2 and MAF Translater Gen2 Pro. They can fool the ecu so you can tune for higher boost and bigger turbos and such. But the best is a standalone, an actual programmable ecu like Ecmlink or AEM.

I would use AEM if I had a different goal in mind, but price is not worth it to just make daily driving a bit more fun. Ive been scouring the web for ecmlink used. I have a spare ecu to Chip(non eprom conversion) but still gets pricey. Standalone is always the way to go in my opinion. Ill most likely just wait.. This is actually the first time im using a MBC too.. in my honda its set up to change boost by gear and all that fun stuff. Is there any benefit to putting the MBC in place of the BCS in this stock system if i set it at 11psi?
 
The 1 g auto came with a tiny little turbo. Just run it like it is. Less problems and still be dependable. That turbo, and the exhaust manifold are both smaller than a manual stock factory setup. If you up the boost any, your exhaust back pressure is going to negate any gains.
 
The 1 g auto came with a tiny little turbo. Just run it like it is. Less problems and still be dependable. That turbo, and the exhaust manifold are both smaller than a manual stock factory setup. If you up the boost any, your exhaust back pressure is going to negate any gains.

It has a 14b and 2 g exhaust mani in it.. only mod it came with
 
with that turbo you can run a max boost pressure of 16 psi on STOCK fuel system. @ 14-15 you are fine, but pushing it. its been said many times but cant find a solid link rn, only a reference found here under boost controller.

http://www.dsmtuners.com/threads/basic-horsepower-upgrades-1g-4g63t.476796/

just play it safe and do the free mods found at the above link

All free mods have been done by me. Im actually on step 3 of the next set of mods. Along with adding a boost gauge and montioring it at a steady 11psi when flooring it. I know its been said it can handle it, just wanting opinions and verification. Makes sense it could push the limits of the maf correction without assistance.
 
no i dont think so if you have stock injectors i think the ecu is competent enough. I'd reset the ecu by disconnecting the battery so it gets used to running 14psi. i think youd be fine without dsmlink tho. anyone else care to weigh in?
 
I ran 20 psi on all stock fuel system on 14b turbo stock fuel pump and stock injectors for a solid 8 years never once had a problem not sure what the 390's are rated for stock though. low 12's all day
 
I ran 20 psi on all stock fuel system on 14b turbo stock fuel pump and stock injectors for a solid 8 years never once had a problem not sure what the 390's are rated for stock though. low 12's all day

I like this real world application.. we can theorize all day.. but what have people ran for a length of time is what I want to know.
 
not all cars can do the same thing every car is different, if your looking for a exact answer I cant see you finding it, wait until you get the proper mods why rush and have issues.
 
IUgrad I respect your answer only thing is why hold back power that is there from the beginning even longer from what the factory has done. Early 90's were good that's when everything was still overbuilt and made not to break. Look at stuff today how long does it last before its outdated or some Chinese company made something and its supposed to break so they can take your money over and over again. I also have the gvr4 jdm engine but ive never had an issue at running 20psi the engine doesn't holds up strong and is still strong. The only things that don't hold up is 3 bolt rear ends and stock trannys, since then I have went to a 4 bolt rear end and a tre tranny but the tranny for some reason only held up for 600 miles. so now im on a 95-96 tranny and its held up great so far. I swear up and down that these motors are built like brick shithouses LOL
 
14psi will be fine, just do your maintance. And don't put sh** gas in it, if your really worried go to a performance shop with a dyno and get it checked out.
Never anything below 91 for me. All maintenance was done before i started driving it.

My buddys only have 2 wheel drive dyno. Ill keep it 14 at most until i have tuning capabilities. Most likely 14 until i have the rest of my parts i want to integrate.
 
Never anything below 91 for me. All maintenance was done before i started driving it.

My buddys only have 2 wheel drive dyno. Ill keep it 14 at most until i have tuning capabilities. Most likely 14 until i have the rest of my parts i want to integrate.
Boost it! Let it do what it was bread to do.
 
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