How much boost can I run?

06-17-2006, 02:06 AM
Okay I have been tossed around all kinds of ideas here from nonreputable places about my boost. I have swapped in a b18b1 into my 4dr 95 civic its turbocharged running only 5 psi which I just recently found out. I am running one of those 12:1 FMU's and stock injectors. I as well have a S-AFC2 that was installed by a shop claiming that I would need it to raise and lower the fuel level. Now with this setup can I raise the boost level or do I need to throw out the FMU and buy bigger injectors and then run more boost or can I do it with the setup I have. The reason I did not know how much boost I was running was because I had a bad gauge. But when I bought my wastegate it supposedly had a .725 spring in it which I was led to believe was 7 psi.
Any help would be greatly appreciated.

06-17-2006, 12:46 PM
If you have some cash to spend, checkout getting uberdata or chrome or something like that, get some injectors and a wideband and have it tuned you'll be much happier than doing anything with an fmu or fuel controller.

goto and search for chrome or uberdata they are pretty cheap compared to hondata and such. Just search around and see what YOU like.

anyway the amount of boost you could run also consists of how good your tune is and what your goals are.

06-17-2006, 01:03 PM
Wow that has been the best info I have ever had. I am really not being sarcastic either that was really helpful.
Steven Combs

06-17-2006, 02:13 PM
Anytime. Good luck with whatever you decide to go with.

06-18-2006, 01:55 AM
stock i think you only have 240cc injectors so dont be going anywhere past 5psi with that...DSM 450cc injectors im pretty sure will be enough meet your goals (depending on what that is) civicHBsi91 said get rid of that FMU and get a real tuning device...just curious what turbo are you running?

06-22-2006, 01:05 AM
the question isn't "how much boost" but "how much power". Your turbo and my turbo are completely different....we need to talk in terms of hp when figuring injector size. DSM 450s on a Crome chipped P28 would be awesome for your set up....FMU isn't the way to go

12-05-2007, 04:32 PM
I have a 97 Honda Civic LX with a B18B1 LS engine. Right now I am running 8lbs of boost on a Greddy T4 turbo. I got my motor swap and boost and tune done by a guy named Jamie at Goods Automotive in Portsmouth, VA and he is a stock car racing at Nascar so he knows what he is doing. He Chromed my ECU and gave it bigger fuel injectors. All this was done for 4,500 dollars. He did an awesome job and it is tuned perfectly. I have beaten cars left and right, even new cars. I have had peoples jaws drop cuz they can't believe how fast and pwerful my 4 door civic is. Needless to say I agree with what everyone has said here. Do alot of research on what your thinking of doing before goin for it. Me personally I would do what Jamie did to my car. Chrome the ECU, bigger injectors, and a T3 to a T4 turbo..Greddy, HKS, Apexi...whatever brand you may personally I love Apexi...but I wanted to keep my AC so I had to go with second choice Greddy (trying to get sponserd by Apexi). But I still love my Greddy. And as far as a turbo timer....I would get one or get a car alarm with one because if you run that turo hard all night then you will definatl want one so your oil can circulate and cool down and not gum up the internals. Also get an exhaust temp gauge definatly. It will keep you from blowing your manifold or engine. Jamie told me not to exceed 16 on the temp and thus far I have not exceeded 12. But I also have a true cold air intake system so it helps too. Hope I helped out. :)

12-05-2007, 06:20 PM
Hey, thanks for reviving a 6 month old thread. Start your own if you have a question. Also, you need to get your shit straight because about 90% of what you said was either incorrect or made very little sense. I could list examples, but i really dont care to waste my time doing so...

12-05-2007, 07:02 PM
Oh snap! You have a T4 Greddy turbo? I bet that thing spools like crazy. And all the engine management, bigger injectors, and a tune for $4,500; damn that's cheap. Or did that include installation of the turbo kit too, cause I can't find anyone who will do all that for less than $10,000. But I bet that cold air intake really helps push those psi to the engine. :)...


12-05-2007, 11:57 PM
lol...i could poke fun at all the inconsistancies in the above post, but i just dont have the time or energy to do it. Keep up the good work :p

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