Max safe boost? [Merged 10-6]

[Turbolaser]

Is it safe to do the boost contol solenoid mod on a stock 1G?

 

[JayRolla]

I have been running a 32psi spike with not issues for awhile now. 6 bolts have stronger heat studs that dont stretch as easily. Im actually still using my stock head studs on my second head and they where still within spec.

 

[habitatguy187]

I have been running a 32psi spike with not issues for awhile now. 6 bolts have stronger heat studs that dont stretch as easily. Im actually still using my stock head studs on my second head and they where still within spec.

WTF , This is totally against everything I've read on the forums, people usually say around 22-23psi, you've got my hopes up because I'm planning on stopping around 23ish psi and if I don't have to buy head studs all the better.

 

[JayRolla]

I do have a MLS HG though.

 

[Calan]

Before my rebuild, I was running 21-23psi daily on an E316g with occasional 25psi spikes, on stock head bolts and stock composite HG (I think..the PO had half-ass rebuilt the motor...I know it wasn't MLS) and I didn't have any issues. DSMLink and 70-90 times put the WHP estimate around 365-375, which seemed about right.

I did find a broken ring land on a piston when I tore it down though

 

[95GreenGSX]

Thanks guys. This isn't my daily driver and I do want gto push it around 25psi on this turbo. If I'm changing my t belt in the near future then I will change my gasket and studs. I'm goin to be running my hx40 setup as soon as I get my damn erl exhaust mani, if it hasn't been changed by then, I will do it when the cams are being swapped

 

[CanadianTSi]

Knock (excessive cylinder pressure) will lift the head, keep the knock away and 25psi will be fine.

 

[95GreenGSX]

Knock (excessive cylinder pressure) will lift the head, keep the knock away and 25psi will be fine.

Good thing I'm running e85.

 

[gettingwop]

No one mentioned anything about fuel being an issue with boost? What about injectors? I think everyone is familiar with being able to push our stock internals to a comfortable amount of power but 450cc injectors and a stock wired FP shouldn't exceed 16 PSI safely. 17-18 at max. I am using a turbo like the 14b or 16g for these figures. Over that you'd be running very lean.

I see your running e-85 so what injectors, fp, and afpr are you using?

 

[95GreenGSX]

No one mentioned anything about fuel being an issue with boost? What about injectors? I think everyone is familiar with being able to push our stock internals to a comfortable amount of power but 450cc injectors and a stock wired FP shouldn't exceed 16 PSI safely. 17-18 at max. I am using a turbo like the 14b or 16g for these figures. Over that you'd be running very lean.

I see your running e-85 so what injectors, fp, and afpr are you using?

1450s, walbro 255 (single as of now), and aeromotive afpr

 

[JayRolla]

No one mentioned anything about fuel being an issue with boost? What about injectors? I think everyone is familiar with being able to push our stock internals to a comfortable amount of power but 450cc injectors and a stock wired FP shouldn't exceed 16 PSI safely. 17-18 at max. I am using a turbo like the 14b or 16g for these figures. Over that you'd be running very lean.

I see your running e-85 so what injectors, fp, and afpr are you using?

Because he asked about the stock motor and if his head would lift. We all expected he had the correct supporting mods.

 

[gettingwop]

Those are some beefy injectors, E85 on! The closest E85 pump for me is like an hour away and it's at a service station on the PA turnpike (near allentown) so it's out of the question for me.

 

[gettingwop]

Those are some beefy injectors, E85 on! The closest E85 pump for me is like an hour away and it's at a service station on the PA turnpike (near allentown) so it's out of the question for me.

 

[melben1224]

here are my mods
apr headstuds
steel headgasket
3' gm mas
maft translator
255 fuel pump and regulator
evo 111 16g
3'downpipe and exhaust
850 injectors
2 1/4" intercooler pipeing
fmic 18x7.5x2.75
boost gauge and mbc
will have alky water injection installed this week hopefully

so at 20 psi what kind of power do you think im putting down to the wheels on pump gas? Do you think i can safely run 25psi with this set up when i get the injection kit installed? i have a pocket logger also for tuning but i havent used it in a couple years but i did tune it for 20 psi back then.

Also what would be a good turbo upgrade for me as i do not want to do anything else to the car except for a better turbo. I really want to hit that 400 hp mark but i would be happy with 350 to the wheels i think. I have this motor in a 89 dogde colt hatch btw if you are interested.

 

[JayRolla]

here are my mods
apr headstuds
steel headgasket
3' gm mas
maft translator
255 fuel pump and regulator
evo 111 16g
3'downpipe and exhaust
850 injectors
2 1/4" intercooler pipeing
fmic 18x7.5x2.75
boost gauge and mbc
will have alky water injection installed this week hopefully

so at 20 psi what kind of power do you think im putting down to the wheels on pump gas? Do you think i can safely run 25psi with this set up when i get the injection kit installed? i have a pocket logger also for tuning but i havent used it in a couple years but i did tune it for 20 psi back then.

Also what would be a good turbo upgrade for me as i do not want to do anything else to the car except for a better turbo. I really want to hit that 400 hp mark but i would be happy with 350 to the wheels i think. I have this motor in a 89 dogde colt hatch btw if you are interested.

Dont ask "how much HP I will put down", thats called bench racing and not liked around here.

I dont know if you are just running the stock timing map but if so that 20psi should be about the most you could run unless you pull some base timing out. If you get a good injection kit than I dont see why 25psi wont be possible or even more with some good timing. To get the 400whp mark usually we have to run 30+psi spikes and lots of timing. Not to mention a good set of cams.

 

[Madcap]

Ok, I searched for an answer but all weren't really helpfully to my situation. I'm currently running a stock t25, turbo back exhaust, evo3 o2 housing, mbc, gauge, aftermarket bov, upper intercooler pipes. Ok, that said..... I'm about to install a 16g, 560 EVO injectors, rewired 550 Fuel pump, 3" GM MAF and translator. What is it that determines the amount of boost one can run safely?

 

[95redturboawd]

You won't be able to know without a way to measure knock.

 

[Madcap]

k, so a Apexi safc will do the job?

 

[e85_4g63]

Safe boost level's are determined by knock count, fuel octane, engine condition, supporting mods, elevation, your car's level of tune, etc. If you want to know what a safe level of boost is then my answer to you is 10 to 12 psi.

 

[Simadowna119]

yes i have searched this and am still yet to find good answers....

i have a boost gauge(not installed yet) and im going to get a boost controller this weekend......can i crank the boost up to 14/15 psi without tuning or adding any additional parts?..and will that mess anything up?

and in my searches i found out you can get more boost by removing the bcs? what is a BCS and is this true?....how is it done in detail please?


thanks

 

[99rtguy]

i would want to add a 2g mas and bigger injectors along with a mbc and getting a logger as well. wanna keep an eye on those fuel trims.

bcs= boost control solenoid

using a mbc, you can delete the bcs

 

[14spectre88]

you'll be fine at 14 or 15 psi. remove that bcs when you get the boost controller on.

 

[slo-rst-laser]

I would strongly get some kind of a logger though, just to be on the safe side.

 

[ali]

you should be fine running 14 or 15psi but that is the limit.

 

[djordan97]

I have seen people locally turn the boost up to 17 psi on stock cars but it has been my personally experience with my eclipse and other turbo'ed cars that it is much better to do things like upgrading exhaust and intakes before turning up the boost as you will see a much more positive gain at that time. I know that there are many threads on this forum and others and by several reputable dsm builders on suggestions on an upgrade path that will yield positive and reliable results. here is a link to a very concise site for upgrading your eclipse, RRE 1st Generation Eclipse  Upgrade Path

 

[Jeff99GS]

Re-wire the fuel pump with heavy gauge wire and a relay!