Who's blown their MSP motor and why?

[UnNaturalinc]

I'd like to see who's blown their motor and why exactly that happened. boost spike, running lean, etc....

I've read a number of times that anything over 250whp is where things start to get sketch. I realize these rods are weak and this is actually nothing more than a 120hp engine w/ a turbo kit strapped on. Many of us (myself included) have already gone beyond double this number.

 

[Captain KRM P5]

well mine is a protege5, but i blew mine dragracing at the track and pushing way too much boost with not enough fuel and way too much spark. snapped two rods, shattered two pistons, bent the other two rods, warped the crank, cut the oil girdle in half, blew four holes in the block and fried a few valves.

 

[benben84]

Blew mine up driving it home from buying it. Previous owner ran 1 bar boost and no ems. I turned boost down to 6psi and threw a rod anyways. I bought the car for half of bluebook and knew it had some problems so I didn't cry too long. haha I now have the engine out and can see right through it. So far damage has only been the hole in the block, smashed holes in oil pan, smashed coolant line to turbo, bent bracket for intake manifold, dirty engine compartment.

 

[Captain KRM P5]

ah benben i know that car well

 

[MyZmZm]

well mine is a protege5, but i blew mine dragracing at the track and pushing way too much boost with not enough fuel and way too much spark. snapped two rods, shattered two pistons, bent the other two rods, warped the crank, cut the oil girdle in half, blew four holes in the block and fried a few valves.

you certainly don't do things half-assed... when you do it, you go all the way! (shocked)

 

[PHRiSCo]

I've blown 2 factory MSP engines.

First one was 5th gear, 6500 rpm, WOT. It was a violent explosion, smoke shooting out from every crevass available from the engine bay.

Second one, not really blown I guess, bent 2 rods. I dont know when. But one morning I was driving just minding my own business havin a coffee, maybe 2000-3000 rpm when the engine starting knocking. One of the rods decided to bend far enough to hit the crank, (is that right?), at every revolution.

 

[jeffmsp]

no properly setup MSPs with supporting mods have failed that we are aware of, then again if you are WOT in 5th it doesnt matter what is done to the motor, its blowing. see brianmp5 for more details lol indigrisil sp? blew his but I think it was due to a bunch of things (and he is p5 neways with an undislosed amount of car raping before hand I believe and it blew in 4th on the dyno) im sure he can give the details

 

[UnNaturalinc]

I've blown 2 factory MSP engines.

First one was 5th gear, 6500 rpm, WOT. It was a violent explosion, smoke shooting out from every crevass available from the engine bay.

Second one, not really blown I guess, bent 2 rods. I dont know when. But one morning I was driving just minding my own business havin a coffee, maybe 2000-3000 rpm when the engine starting knocking. One of the rods decided to bend far enough to hit the crank, (is that right?), at every revolution.

So why did they blow? That's what the point of this thread is.... to bring up the variables and circumstances that cause the motor to blow.

 

[UnNaturalinc]

then again if you are WOT in 5th it doesnt matter what is done to the motor, its blowing.

Huh? (uhm)

 

[Shane5425]

well, i guess if it goes , u just go all out..... damn...

well mine is a protege5, but i blew mine dragracing at the track and pushing way too much boost with not enough fuel and way too much spark. snapped two rods, shattered two pistons, bent the other two rods, warped the crank, cut the oil girdle in half, blew four holes in the block and fried a few valves.

 

[silverspeed03]

Huh? (uhm)

Yeah I would also like to know more about this.

If I'm going 80mph in 5th gear and want to pass someone..... I should drop to 4th?

 

[warrier04]

^^ yes.

5th is not a passing gear. it's a strict cruising gear.

 

[Blitzd]

here is the 5th gear thing again. I have heard this from many places. We have noticed similar problems with a Mazdaspeed6. It hasn't blown it motor but the ecu is cutting power to stop it from over boosting I think. Have no real reason why yet. If you are at 80 in 5th I would think that roll on power should be fine but the probelms I think occur when the rpms are low in 5th and you nail it. Car is really slow to accelerate and the turbo is making all sorts of noise trying to bring the car up to speed. Not sure why it acctually hurts the car I guess it might lean out in 5th.

I blew a motor in my Spicy, I was running 12 psi at the time with some decent supporting mods. Just no tuning. Thats what I believe killed me. Fried my turbo, and 2 rings.

 

[UnNaturalinc]

^^ yes.

5th is not a passing gear. it's a strict cruising gear.

The purpose to downshift would be if you didnt have the power to pass in 5th. Yes, there'd be more load in 5th however. But it shouldn't be considered a "strict cruising gear"

I personally use engine power rather than turbo power when needed. Something that stuck w/ me after my RX-7 (since boost opens up the secondary injectors). So for fuel economy sake I'd use engine instead of boost. Load promotes boost so to speak.

 

[ChopstickHero]

^^ yes.

5th is not a passing gear. it's a strict cruising gear.

depends how fast you want to pass the car in front of you.... haha. if you're passing them slowly, then why downshift? if you want to dust them, then yeah, downshift.

i found that after my turbohoses smic and Unichip were installed, i had more "passing" power in 5th gear.

although on steeper uphills (frequent on some SoCal highways), I usually downshift to 4th instead of staying in 5th gear.

 

[warrier04]

true.

when i say strict cruising, i mean a 'no boost' gear. from everything i've read, boost in 5th gear has created many headaches for many people.

 

[jeffmsp]

ive boosted it hard on stock boost and 10psi up to 5th rev limit, but I had all the mods, really good gas, methenol, etc but i would never advise it.the motor will blow. 5th is just too much load. one misfire or hell if anything went the slightest bit wrong im sure it would have popped and popped big. I would definately not boost 5th unless Im at the end of 4th with full momentum going into 5th. Dont start boosting low especially. just dont boost it at all if it feels like the motor is taking alot of load. maybe 1/2 throttle max t play it safe etc

 

[UnNaturalinc]

true.

when i say strict cruising, i mean a 'no boost' gear. from everything i've read, boost in 5th gear has created many headaches for many people.

That would be an outside variable then, not due to simply just boost in 5th gear...

If you're cruising on the freeway and give it gas at all, you're going to be boosting instantly.

 

[SP33D]

My first motor (stock boost with cold air intake) blew when it was 0 degrees out at partial throttle in 2nd gear... the turbo would scream at partial throttle if i did it a certain way.. but the car didn't really move, so I'm guessing it leaned out and i throw the #2 rod through both sides of the block.

My second motor (stock boost, mam fmic, cai, 3" turboback exhaust) when it was first put in under warranty it used to tap really bad (back when it was stock). Well mazda said it was the lifters that needed to be adjusted or something, so they fixed it and it stopped tapping. So then I did those mods, and about 2 months later, the tapping started in my block instead of my head. I'm afraid to drive it now because the tapping is so loud that I think it can blow at any time. I think the problem is one of the rod bearings.. but I don't have the money to fix it right now.. so I'm just saving for the MAM built motor ( ps beau if you read this and want to give me a good deal, let me know )

 

[silverspeed03]

That would be an outside variable then, not due to simply just boost in 5th gear...

If you're cruising on the freeway and give it gas at all, you're going to be boosting instantly.

This is exactly what I was trying to say...How do you NOT boost in 5th.