Max boost on stock internals
 

With a FM II link and a good tune how much boost can you run on stock internals? 15? I've seen alot of people say 12 and others say it can run 15 fine.

A friend of mine has been running 15psi on his 95 with a Link and AVO turbo kit for 5 years now. He's got a very good tune IMO. Runs numerous track events and drives it on regular basis. I think the reality is - the more boost you run, the sooner the demise of your engine. BUT there are so many other variables in there that can lengthen or shorten that "deadline". I'd run 15 since I know somebody doing it with the same setup. And the fact that a 1.8 salvage engine is relatively cheap and simple to replace, makes it hard not to do.

Thanks alot for the info. Taking the car in on monday to finish getting it tuned. Going to do 15 PSI. Hopefully I can go to the dyno soon and see what I'm running.

Don't forget... turbo size makes a big difference in the PSI you can support. Its not PSI that blows motors... its HP/TRQ/Stress that kills them.

AVO system isn't the same as the fmII right?

no, not the same.

not the same but the avo kits used basically the same turbo. 15psi would be just fine.

im glad to hear this.:bigtu: so im not ass scared of doing this:crx:

Some AVO kits came with t25 but most with t28's, I have the t28 at ~10-11psi = 210rwhp, 15 should be about 250whp which is about the max for a stock engine

His peak rwhp number was 267. It was a real sleeper too, until he put the extraction hood on it. Just looked like a regular Merlot until he mashed the go pedal.

I did run 18psi on my 1.6L for 2 1/2 years and it lived through it all. Ran a 8.2 @ 88mph in the 1/8 mile with it too. It was a T3 S60 setup with a similar fuel system to what I have now. Was most likely around 260-270whp. It blew up when I spiked to 25psi ( MBC failure ) on the interstate @ 6500rpm in 4th gear.

15psi on a GT2560R is a lot different than 15psi on a 50 trim T04E...but either way it will live with good tuning. The strength of the B6 and BP engines are quite impressive.

Thanks for the info Andy :)

What is the most power you can run safely on a 01-05 vvt engine.
Is 240 safe?

20Gs

Do u think many others know where 20gs came from in this regard?

Isn't that why it's funny?

90 Turbo, all Miata motors (90-05) will withstand around 250whp and 225wtq. Above that, reliability begins to suffer. You cannot use a boost level to describe engine reliability.

i mean it's funny to us specials who get the joke :)

Its normally the rods that gives these stock engines trouble isnt it? And those are normally busted by the torque right?
Would pushing the power band higher (through a intake manifold with shorter runners) lower the peak torque slightly, allowing more high end power while reducing stress on the rods?

technically.

So you'll drop a ton of money and R&D just to save yourself the "headache" of putting trouble free rods and pistons in?

If the tune is good (i.e. you don't burn a hole in the piston or melt a valve) the stock rods will go first from simple torque. They are the same basic cast rod for all 15 model years. Most turbos don't like to run at extreme RPMs which makes any intake/head work academic if you are doing it to lower torque values. Just put some forged ebay rods in and be done with it. :2cents:

i know a local guy whos running 21 psi on a stock 1.6 but hes running 22 degrees retard timing, he said he has about 250 to the wheels... his car is no joke. he autocrosses religiously and has had his set up for a little under 2 years.

i have a fully built 1.6 and a t25 max power is 250?

what kind of power could you make with a 1.8 with just arp head studs and a new head gasket? I'm gonna hopefully be finishing my drift build before the summer so I want to be able to push reliable power for the season but from this thread, people are saying you can make 250 with stock internals?

Holy Necro Batman... Good luck with the incoming onslaught :facepalm:

If you survive, you've got a lot of reading and learning to do.

Lots bro. Just send it.

ARP headstuds and a new HG should be good up to about 25psi. So run about 22psi just to be safe.

the same exact power that you can without arp studs and new headgasket

This.

And the other, too.

Came for the show. :inout:

Damn, this thread has been double Necro'd. Impressive, newbs, impressive.

At this pattern, this thread should come to life again around 2023. Welcome to the Noob Comet thread everyone.

10/10 will ban again

It's a remarkable dichotomy. He clearly searched to find this thread, but then couldn't read it to find the answer?

Is tire smoke a hallucinogen?

I need a business partner to go into the business of producing Tire Smoke vape juice flavor.

He probably had a hood vented exhaust dump killing brain cells.

probably will be still.

This entertains me, because the OP is an IRL friend. He was 17 or so when he made this post in 2007.

Hi Doug!

I'm throwing money at my screen right now for this investment opportunity and nothing is happening.

just read trough this discussion about the limits of the stock engine. i find it very interesting that from my experience the pure torque level is not equivalent to the stress the engine experiences.
I am currently running my 99' B6 NB (yes with had the 1.6 in the NB in europe) with a TD04L-13T at 15psi@4500 tapering up to 17-18psi@redline. with 13psi all the way it pushed 300nm and 220hp on the dyno (talking fly power).
this setup is going strong for about 22tmiles now.

friend of mine bent his rods on his 1.6 rotrex supercharged after bout 15tmiles. on the same dyno as mine it did 243nm and 255hp (on the fly). much less torque but more top end power. he ran on excellent fuel with great intake temps massive amounts of timing, tuned on the dyno, no knock detected and as the dyno told, it made good power and felt aggresive.

What i want to say is, that from the torque standpoint, there was no concern at all, that this setup would harm the engine. In my opinion you can't limit the stock engines capability by Torque nor Boost levels. Just exceeding the peak cylinder pressure, the engine (the rods to be honest) can take, will wear it down over time. i ended up tuning my timing to a point where the engine still sounds very flat and soft, not aggresive and hard working, even if i could ran more without knock, i don't think thats the way to make it reliable on the long run.

Daniel

In a fair attempt to enlighten us, You read a 10 year old thread.