engine

[msprotege2k3.5]

ok ive been doing some reading on here and i have found many different answers about the same question. i have a 2003.5 msp and i would like to know how much HP and boost pressure can the factory block handle. i have a unichip that has been tuned on 13psi and i have been driving like that for 2 years and nothing has happend. i change my oil every 2500 miles anduse full synthetic, and keep up with all maintence. so if any one here really knows the exact numbers can u please let me know. thanks.

 

[ZOOMit]

What's OE PSI, 9? If you've been driving like that for two years then you'll be okay. Not sure how much boost it can handle. 15-19 I think but don't quote me.

 

[theEZV]

no exact numbers. most people are afraid to go over 10psi. sounds like you have a good tune, and are probably pushing the limits of the stock block. what are your mods besides the unichip?

 

[theEZV]

What's OE PSI, 9? If you've been driving like that for two years then you'll be okay. Not sure how much boost it can handle. 15-19 I think but don't quote me.

stock psi is like 6.5. these rods will not handle 19psi

 

[SeR_Cyclops]

not true. I know a guy that ran 19psi on the stock turbo with a tune and it didnt blow up. he lowered it back down and then ended up getting a disco tater.

 

[theEZV]

the number of people running that much boost on the stock block is very small. there's a reason for that. props to your buddy. i would be too scared to run that much

 

[SeR_Cyclops]

It was 505zoom.

 

[808MP5]

So how much boost are you running?
13psi on a stock block is awesome.

My stock block is pushing 209whp
8-9psi with a gt30r
untuned

 

[theEZV]

505zoom is the man. im gonna turn it up to 10psi once it gets warmer and hope for the best lol

 

[Spiced MSP]

im scared to even go into boost now and I have not touched the boost at all. I have a MBC but it's not installed. I have heard too many stories of blown engines on stock boost and also the A/F mixture leans out as the rpms increase in boost? I barely see boost, at least not until I get some sort of EMS. CS downpipe, EMS, and AEM UEGO hopefully coming soon.

 

[JMKOOPA]

I used to run about 18psi daily for 5 months and the day I lowered it... boom. Wasn't even pushing it or anything. But I was looking for a reason to get a built engine anyway so unless you've already saved up for one, I'd suggest you keep it under 9.

 

[Spiced MSP]

I used to run about 18psi daily for 5 months and the day I lowered it... boom. Wasn't even pushing it or anything. But I was looking for a reason to get a built engine anyway so unless you've already saved up for one, I'd suggest you keep it under 9.

(iagree)

 

[Rush]

I ran about 10psi on my MSP for awhile, and that was as far as I was ever willing to push it. I was on the stock block .. BUT I had essentially EVERY SINGLE supporting mod in existence. Even still, it was a risk -- but I knew that and was willing to deal with the consequences if/when the engine committed suicide.

 

[slavrenz]

not true. I know a guy that ran 19psi on the stock turbo with a tune and it didnt blow up. he lowered it back down and then ended up getting a disco tater.

Yeah, maybe it worked once or twice, but have him run at 19psi every day for a week or two and then see what happens. IMHO, I'd much rather to be able to boost reliably for a long time than to get off a one time "suicide boost". But maybe that's because I'm a poor college student

On a side note to the OP, full synthetic oil every 2500 miles is crazy! You could probably double that interval and save yourself a few hundred bucks each year. On the bright side, you'd have enough saved up after a few years for a new motor in case you do decide to push the limit on your block.

 

[BOOSTR]

No one will be able to tell you at what point your rod bolts will let go and/or when your rods will twist and you will have one or more new places to see what went wrong inside your block. Just be glad that it held up for 2 years and that you are tuned. Maybe you are not a hard driver or have simply been lucky. With a 17.1:1 effective compression ratio you better hope that all systems remain in go mode.

 

[808MP5]

505zoom is the man. im gonna turn it up to 10psi once it gets warmer and hope for the best lol

I was under the impression that colder air is better. Denser = more air = more gas

 

[jonridinhi]

which means you will hit fuel cut sooner in the winter....

then lean out. BOOM!

 

[theEZV]

the cold has screwed up my afc tune

 

[jonridinhi]

See.....

Ok I will not lie I found this out the hard way. I tunned in July in SC and that winter up in WV my tune was crap.

 

[808MP5]

which means you will hit fuel cut sooner in the winter....

then lean out. BOOM!

Sounds like you need a fcd and add more fuel. I was under the impression if you hit fuel cut. It also cuts off the engine also which = no combustion = no boom ??? In theory I guess

I wish it would get a little colder here. 65 is the low