Longevity of the perfectly built 7M

[born2drv]

I want some opinions here but no wise ass responses

If you had unlimited budget, the perfect machinist, the best components, etc.... and you built an engine, how long do you think it would last daily driven very hard @ 600hp?

I know it's a very open ended question with a lot of variables, but if you built the perfect engine how long would you be satisfied it lasted?

I'm coming to to the realization that no 600hp engine can be built bullet proof and sooner or later it will tire out or break down. Is it fair to say the best 7M engine driven hard at 600hp will still need rebuilding every 50,000 miles? What about 500hp? 100,000 miles?

 

[johnathan1]

Well, I haven't really seen too many 600hp 7M's, asomething usually goes majorly wrong before the engine wears out.

 

[Big Wang Bandit]

I have NO FIRSTHAND experience, But my friend who put a TON of money into his 7m(over 5000 dollars) just recently shot a rod out of the block. Even after 3 tuning sessions.
He wasn't even driving it "hard" for the 4-5k miles he was running it.

But then again, Maybe some of his work went wrong.

 

[tissimo]

about 2 weeks then a bhg and a rodknock to follow after that..

As long as you want prettymuch.. Its all in the tunning.. look at Duanes car.. it has lasted a long time now... and still going strong (i think unless hes rebuild the engine with his new setup?)

Send your oil out every once in a while to get checkout to see whats going on in the engine.. I'd say if you beat on it constantly probably last 50k miles then think about rebearing it and check everything out make sure its all good..

 

[MassSupra89]

3,000 miles.
The block and head can be crafted and assembled by god. But the headgasket is not. Lol.

Yea it's all about the tune, there is a point where parts will wear, and wear faster because of the power, its just a given with moving parts. But catastrophic failure can be avoided for hundreds of thousands of miles with the "perfect machinist and tune"

 

[Mr.PFloyd]

get a 2jz :kloguck:

 

[starscream5000]

:werd: If you ran the perfect A/F and great Oil pressure for the weight you used (Group V 0W 30 FTMFW) along with having your oil temps in the optimum range for operation and efficiency, not to mention 190 degree coolant temps. Then it all depends on how hard you drive this 600 HP beast. Oh, BTW Kyle, 2500 isn't a ton of money .
















I knew what number you meant.

 

[Big Wang Bandit]

:werd: If you ran the perfect A/F and great Oil pressure for the weight you used (Group V 0W 30 FTMFW) along with having your oil temps in the optimum range for operation and efficiency, not to mention 190 degree coolant temps. Then it all depends on how hard you drive this 600 HP beast. Oh, BTW Kyle, 2500 isn't a ton of money .
















I knew what number you meant.

Stop pointing out typos plz. AIM doesn't help my SM posting.

 

[Doward]

If I had that unlimited budget, I'd have a turbocharged LS7/T56 in my Supra

Seriously.

On a 7m, though - a perfect MHG setup, a set of Carillo rods, custom billet crankshaft, forged slugs with optimized quench, AEM EMS with a perfect tune - topped with a properly built tubular manifold + a proper sized turbo/intercooler to keep temps UNDER 100º F coming into the intake - I could see 600hp lasting a long time.

Driven 'very hard' though, is extremely relative. Are we talking constant 1320 runs? Auto-x? Just driven daily, I only find myself hitting my set 14psi maybe... twice a day. Everything else, is just a heavy part throttle (where I believe the majority of Supras kill the stock gasket).

Just my .02

 

[johnathan1]

That's interesting, so you think heavy part throttle acceleration is harder on the gasket than WOT?

 

[starscream5000]

Why do you think that? A leaner condition while at heavy part throttle vs. full throttle?

 

[supramike7m]

why do you say that doward? interesting

 

[boostadikt]

it will last as long as you can maintain it, i am running 500whp almost daily and my built engine is now at about 6,000 miles and running just as strong as ever. if it stays maintained which it will i expect at minimum 2 or 3 more years out of it, probably changing turbos, fuel and other things over time

 

[mkIIIman089]

(Group V 0W 30 FTMFW)

Erm... well... ah nevermind.

 

[born2drv]

Hey guys the reason I'm asking this is because my 7M recently had a catastrophic failure, I knew it was coming since my engine was knocking but it's still painful to hear your engine pop/snap/bust on the freeway ... I learned my lesson and my next rebuild will be much better then the one I had done recently.

I was hoping it would last a few more months while I got all my rebuild parts in order but I guess I wasn't so fortunate. So anyhow I'm just trying to do a cost analysis of sorts, to determine what my HP goals should be. I was VERY happy with 450ish HP and perhaps 600-700 is really not needed and is a lofty goal. Maybe I'm better off just being happy with 450-500 running as efficiently as possible (my new FFIM, better exhaust manifold, upgraded cams, etc), and rebuilding the engine to withstand 700+ hp and hopefully that will last say 100,000 instead of building an engine for 700+hp and pushing it to 600-650hp frequently and seeing it last only say 15-20,000 miles.

So I guess I'm just debating what I want out of my car, I know I want my next engine to last at least 50k miles easily, preferrably 100k. So that means I really can't ask it to make much more then 500hp even if I build it up like crazy. And if 500hp is my goal perhaps I should look into a slightly smaller faster spooling turbo for my next setup.

 

[jdub]

Erm... well... ah nevermind.

^^^ LOL

Actually this whole thread is highly amusing

 

[born2drv]

This is no laughing matter I want some honest useful feedback here. Rebuilding a 700hp engine and pushing 700hp out of it for $5k every 5,000 miles is not really my idea of fun Rebuilding a 700hp engine and only pushing it to 300hp will obviously last forever but is no fun either. So where is that happy medium between power and relative longevity? I'm trying to determine what a realistic power goal here is.

 

[jdub]

Fair enough

I built mine for 700 HP and run in the 450ish range. I used top components for the bottom end and head...crower rods, fully balanced, line honed, Ross pistons, 1mm oversized valves w/ TRD springs, mild port to name a few. I made 100% sure all torque specs and all clearances were met.

Got over 10K on the motor and it's running great...plenty enough fun for me. An AEM EMS and 264 cams are in the works.

Having said all that, you could do everything perfect and still have a failure...you never know when that rod has a fracture inside or your AFPR suddenly decides to cut your fuel in half and you go lean. The only thing you can control is buy top components, assemble w/ attention to detail, and resist the urge to cut corners.

 

[tissimo]

Get good quaity parts, have it assembeld preceicly, and get a good tune on it by a good reputable tunner and you'll be good. If your seriously want it to last, invest in a standalone, and have it tuned.

Its all in the tunning. Darin ran his bone stock 89k miles 2jz to a 9.49 i think at 144, but he is one hell of a tuner.

 

[ma71supraturbo]

"Very hard" is very subjective. Competitive race car engines rarely last more than 1 season. You will see guys run more "stock" engines in the restrictive classes for maybe 2 years. But they're running WOT for 30 minutes to a couple hours at a time...

On the other hand, you could have a 1000hp supra that you go WOT for maybe 10 seconds once a month. It might last 50,000 miles.