Max safe boost? [Merged 10-6]

[Turbolaser]

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

 

[lporte01]

Your best bet is going to be start out at say 15lbs or so of boost, then work your way up until you get to say 25 max. This also depends on the rest of your setup. What fuel system modifications do you have done?

 

[RadDsm]

You should only run as much boost as your fuel system will allow.

 

[DROPthatCLUTCH]

Your best bet is going to be start out at say 15lbs or so of boost, then work your way up until you get to say 25 max. This also depends on the rest of your setup. What fuel system modifications do you have done?

Just an upgraded pump. Not sure what kind..
Was set at 22 PSI on my 14b when i bought it. Haha
I turned it down eventually though.. But i missed it when i did.

 

[lporte01]

Upgrading to the turbo, you should also have a bigger set of injectors, an adjustable fuel pressure regulator, and preferably a 255lph fuel pump. One thing you dont want to do is starve your motor for fuel. Detonation is your worst enemy.

 

[cantgo2fast]

I run mine at 15lbs on the street and 21-22 when im at the track. Will go to 25+ when I get my E85 setup

 

[tips000]

I litterally just ed.

But seriously!? That much boost?
I was thinking, more like 15?

, i thought it was funny, i know 12 isnt much, but on the stock fuel system it still pulls harder than my neighbors 14b did on his completely stock tsi

 

[DROPthatCLUTCH]

Upgrading to the turbo, you should also have a bigger set of injectors, an adjustable fuel pressure regulator, and preferably a 255lph fuel pump. One thing you dont want to do is starve your motor for fuel. Detonation is your worst enemy.

Yes, very true.
Well i think I'm going to run 15, Just until i get some injectors, FPR, and EGT.

 

[RadDsm]

You shouldn't run any more than 11-12psi unless you have a way to monitor knock. 15psi is most likely going to be too much.

 

[dsmboost84]

I ran 22 psi on 93 all day! But do make sure you have the fuel to compensate and some kind of engine management.

 

[dmentdgst]

I'm running at 20psi but from time to time I'll push 23

 

[rs2nr]

Does tuning come into play when raising your boost?

 

[skatershawn]

Does tuning come into play when raising your boost?

Absolutely... i mean a stock tune will be ok upto maybe 14-15psi, but to be completely save you should push it too much! Some people to tend to run higher, 18-20psi on stock system and tune, but i think that pushing it a bit! You don't want to starve you motor from fuel, you will end up melting a piston or something! and you want to tune to try and stay far from knock, because pre-detonation will destroy your motor.

So again, yes tuning comes into play when you raise the boost!

 

[rs2nr]

Yea im just buying every part and setting it to the side, as tempting as it is to install i rather play it safe than take a chance.

 

[DROPthatCLUTCH]

Absolutely... i mean a stock tune will be ok upto maybe 14-15psi, but to be completely save you should push it too much! Some people to tend to run higher, 18-20psi on stock system and tune, but i think that pushing it a bit! You don't want to starve you motor from fuel, you will end up melting a piston or something! and you want to tune to try and stay far from knock, because pre-detonation will destroy your motor.

So again, yes tuning comes into play when you raise the boost!

Yeah, I'm actually just gonna leave my boost where it is right now and run 12 psi for now.
Thanks for the info man.

 

[my dreamt dsm]

I've read that 10 is safe on a 7 bolt but you might not feel any difference. How come I see some members and youtube vids where people push 16-17psi with no tune...example just downpipe, exhaust, intake

 

[JusMX141]

it's my excuse to buy a evo III big 16g, and some headers.

Did you drop a 5.0 in that beast?


By the way- we don't really need another "how much boost" thread clogging our arteries, so it's now merged. The working limit of an Evo III 16G is right before the turbine wheel melts off, or right before your rods blow through the block. Some guys like to run less boost than others to prevent either of these events from happening.

Carry on.

 

[PWR4HIM]

Well I guess this is the place for this question instead of a new thread, because it kinda has to do with a max boost question but is a little more detailed.

Car has AFPR at about 39.5psi, rewired 255, stock 450cc's, MBC set at 15psi, stock ecu and tune. My question is that I have read a million times that about 15psi is max for the stock injectors, well I just got my WB o2 in and I am reading about 10.2-10.5ish at full boost. So correct me if I'm wrong but would it not be safe to turn the boost up a bit more, maybe 17psi (I know the 14b probably isn't efficent much past 18psi). I was thinking as long as I try to keep the AFR's richer than say 11.8-12 at full boost I think I'll be safe. But that is my question.

Also does the stock ecu account for knock to set off fuel cut, because I thought if it does look at knock values for fuel cut it might hit fuel cut at 17psi because of knock. I still have the stock SMIC, but a FMIC is sitting in my basement and going on next week. So question #2 is (if you think knock would be a concern) wouldn't the FMIC make a difference in knock and then 17psi be safe? (assuming my AFR's will be ok at 17psi).

Sorry I don't have a way to log yet. That is the next purchase.
Thanks

 

[britdog]

Okayi have a 4g63. Im going to be installing a 16g turbo from dnamotoring.com. i got it off my buddy. I also am putting on a stock 2g ported exhaust manifold. a front mount intercooler and a open o2 dump. i have a manuel boost controller and a greddy turbo timer. and a cold air intake. I have the stock fuel pump and fuel injectors, so what kind of boost should i run with these new parts. I was told no more then around 14 to 16 psi so i dont fuel cut. thanks guys
I also attached a picture of the turbo its brand new never used and no shaft play or anything

 

[SOADweskey]

You were told correct, and you should also buy something to let you log/tune the car as soon as you can. Then get a bigger fuel pump and injectors and have some fun.

 

[Bud92gsx]

You should be safe with 14..16 psi on a 16g might be cutting it pretty close...

 

[Achelea]

Well, get a Datalogger and keep the boost down.

If you look up some tuning suggestions, they suggest slowly turning the boost up til you get knock, then back off a few pounds. Keeping under the knock keeps you safe.

*Goes looking for the tuning page he's thinking of.*

 

[britdog]

alright cool thanks guys im going to turn it up slow. i dont want to push something to hard and damage something. i will most likely be getting a new fuel pump and injectors around xmas time. im looking at dsmlink or another one called eprom i believe.

Okay im thinking pocketlogger. Its not as expensive as dsmlink. But what do you guys think

 

[Achelea]

Get the pocket logger BEFORE You start turning up boost. There's a list here and one of the quotes is "It can handle 1 more pound." Then the motor goes boom.

 

[hurricanecris24]

Whats the max boost someone has run on the stock 2g pistons with 1g big rods on race gas or meth?

 

[icerob]

Whats the max boost someone has run on the stock 2g pistons with 1g big rods on race gas or meth?

Or E85?