She blew!!!! :(

[kapower06]

Racing a twin turbo 350z A/T, 03 mustang (cam, intake mani,headers,exhaust, chip tune), and another 06 gt' ( unknown mods, probably stock). ANyways racing the 350zTT was a blast we were dead even until my car bogged out for a split second and then it still accelerated, yet slower then normal, so I immediately backed-off the throttle, and went into 5th and just started cruising. Waited a minute or two and decided to get back on it, up to 20psi and everything is good. So we get rolling again at about 45mph (4.7k rpm in 2nd with j30 lsd) and I start loading up before we start ( applying brakes and flooring it) I usually start loading it up as soon as I here the first honk. Well,third honk comes and I leave at 18psi, which = WOW!!! tires loose at 45-65mph, chirp the tires into third at close to 70(pretty cool sounds while going over highway speeds, lol.) the 350z and I are dead even , the stangs are falling behind, quickly. lol. Pull through third into fourth and still dead even, into 4th and I notice slight chugging coming from my car, so i back off asap, into 5th and nothing, no power, give the car any throttle and it just bogs out, I though I blew an i/c pipe..... Then the ominous smell of burning coolant fills up the car. Sh!#.

I pulll over and there is smoke pouring from my exhaust , freight train style. lol. Popped the hood and there is smoke spewing out from the back of the head onto the firewall. The radiator is cold. So I pop the cap, its empty.

THe question I have though is how come there is no oil in the coolant and no coolant in the oil? its weird, the oil level is perfect and once I filled up the coolant it stayed nice and neon green? SO there is no mixing my guess is that it blew the back of the gasket and the compression pushed the coolant out and not into the combustion chamber.

So I pulled the spark plugs out and heres what I saw.... OUCH!!! looks like 3 & 4 detonated..... I then remembered that I filled up with 91octane and not the 93 that I usually fill up with. ( the damn gas stations around here are switching to 91octane, the station that I filled up with 91 used to have 93, but no excuses)

Also looks like I was using too cold of a plug, bcpr7ei-x. Shoulda stuck with the 6's. oh well.



So then the process starts as I begin to tear her down for a head gasket and anything else my baby wants. Almost an excuse to save up a few bucks and splurge for some forged pistons/rings and possibly some cams,springs , and valves. getting set-up for my future plans of about 450-500whp. I think stock rods should hold that? chime in anyone?.

Before I start tearing her down



about 2 hours in



And just cause I like timing belt shots.... Even though my pulleys look funny.



Any questions and/or comments are greatly appreciated. Thanks everyone.

P.S. I was thrilled to be dead even with a greddy kitted 350z. even if I popped my head gasket. lol

[Logan76]

That sucks you blew your HG but thats tits you went side by side with the Z, What are your plans for a turbo? going bigger? and are you going to go with a FMIC this time?

[kapower06]

Yeah keeping up with that 350z TT was pretty cool. The guy gave me props for keeping up. Yeah Im planning on the gt2871r with the .64a/r, and at that point cp pistons, cryo stock rods, cams, springs and then yes a Front mount.

[r34 gtr]

weak sauce abou the HG! at least youll be able to do what i did and rebuild it the right way. not that mine has anything to show for it buuuut.... good job showing those clowns what 1.8 liters can do!

[kapower06]

Yeah I'd like to get a little window sticker that says either, only 1.8, just a 1.8, or only a 4 cylinder. BUt then again im going for the sleeper kinda thing. BUt yeah it sucks about the headgasket. oh-well. it was bound to happen sooner or later. running 18-20psi spiking to close to 25pounds, I guess has some negative effects on the head gasket, along with some detonation, and maxing out my n60 (maxima) mafs. lol that puts me damn close to 310hp.

[kapower06]

yeah I hit 96% afl on the SAFC2 During one of the runs. which (310(.96)=297.6hp)so damn near 300whp. I wish I had more then a few hundred bucks saved up...lol. I would be getting some cp pistons, and probably some Tomei poncams. Oh well. Ill be back in the game as soon as it quits snowing here as I don't have a garage.

[rico05]

When my HG went, it did the same thing. No mixing, nothing odd. Just a river of coolant pouring from the side/rear on the exhaust side of #4. Sucks man. But this is an opportunity to do some nice work!

[r34 gtr]

mine just leaks oil there. no coolant. still kinda ghey though. you totally pwnt those plugs, hope nothing else is worse for wear!

[boost_boy]

Jake,

Glad you're having fun with the car. It's been good to you, but you got to think about what caused this problem. Detonation is usually bad (epecially when it does that to your spark plugs) and I'm pretty sure you were leaning-out as well. I'm going to share this with you in the fact that you smoked more than just a headgasket. You've cracked some ringlands on the intake valve side of the pistons, so don't get lazy on me and think it's just a headgasket.

You know I won't steer you wrong, so when you read this, give me a call and we'll rap more about it. And silly, you don't need to cryo your rods to make over 400hp and you really don't need CP pistons either unless you plan on running some serious boost through that engine and on a regular basis. Give me a call because your # is somewhere in my home and I'm not there.

Dee

[dash]

wouldn't plugs be lighter if car was leaning out ? ...or could oil vapour be contaminating the mixture ?Maybe high intake temperatures due to the sidemount at that level of boost, resulted in detonation.

Stock fuel pressure regulator & 240sx fuel pump ?I'd think a T3 compressor @18-25psi would max out the 370s. Hi tq too.

What will you use to tune your 4-500hp venture ?

Dees' 't28 hookup' is one tougha55 li'l turbo, no doubt.too bad tho, 'cause car sounds like it was a blast.

[sedoken]

that sucks. but know that spinning your tires = bad (even chirping). next time u race try not to do it.

yeah it's a lot more fun to do and people will think it's 'cooler' but it doesn't help with winning a race, especially one that close

[kapower06]

Dash- I dont think I was leaning out to far but I know I wasn't burning all of the fuel due to the amount of suit coming from the exhaust. Which doesn't necessarily mean that I was not leaning out. Also IM pretty sure the sidemount was not heating the air over a dangerous level.

Bottom line is I was running 20psi +/- 2psi on some 91oct. that the gas station changed to recently. ( I shoulda looked, oh-well) . And well the SAFC went up to about 227points on the knock meter....

But I see this as an opportunity to create the monster that I've always wanted.

Walbro 255lph (hi-pressure model) with the stock regulator. (no-no I know)

My plans for the 400-500hp are as follows 1.Sell all current parts to include (t25 hybrid turbo, SSAC Manifold,Megan 02 Housing, ARC smic(inc. all piping and stock recirc valve.) , 444CC GTi-R injectors, Horsham Developments stage 3 chipped ECU, N60 Mafs, Wiring harness with SAFC II (black edition) wired in already and tuned for 93oct. gas and n60 mafs. looking to get around $1500 obo for everything. may part out.

2.Purchase ssac FMIC, t3 top-mount manifold, T3/T04e (60trim, stage 3 .48 a/r), 72lb. msd injectors, and an SDS.

3. ARP headstuds, "Dee's special" 270* cams, Heavy Duty Valve Springs, New main&rod bearings, CP pistons (maybe) or Stock pistons (possibly swain tech coated) with good aftermarket rings. Ka-e Throttle body. All new gaskets.

4. Get tuned, go for maiden voyage, **** myself, change underwear, repeat.

sedoken-

Your partly right..... Spinning your tires is not bad even in drag racing... Research it. there is a specific point to where spinning the tires keeps the engine in its torque "band" while still achieving maximum acceleration.

[r34 gtr]

man, im worried about maxing out my 510s with 20lbs. 370s were a little weak. give that bad boy a lot more fuel! anyway, you might want to spring for a slightly more hoss turbo. isnt dee running something similar and making ~350? (dee, feel free to slap me around). maybe a td06 25g or a gt35? other than that it sounds like a good plan. would probably do the cp pistons to be safe. i mean, lets be honest, you probably raped the ones in there. if you get greedy and decide you want closer to 500 you will be in for some trouble.