saving Stock rods by keeping peak torque low ? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-17-2012, 11:11 PM   #21
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Originally Posted by Boosted Escort View Post
I made 280 whp with a holset hy35 on a stock BP until the oil pump blew. another guy on clubprotege made 300hp on a stock BP. he had an aem stinger with a good tune that motor lasted for two years and then the oil pump gears shattered. I could probably list a dozen who have been around 300whp with stock internals granted some of them didn't last that long. its all in the tune.
Just curious were you running a stock or lightened flywheel ?

Im planning to run a stock flywheel with a FM clutch. With all the vibrations that are going on at the crank with 250whp using a light weight flywheel seems like a bad idea
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Old 10-18-2012, 12:10 AM   #22
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FWIW I've been running 17psi-18psi (MBC) with a GT2560 on my stock 97 engine daily for a couple years. I do have minor oil consumption (.5L in 1500-2000km).

I only operate the car this way because I have a vvt head sitting there and intend to build a bottom end anyways.

YMMV
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Old 10-18-2012, 11:38 AM   #23
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Originally Posted by AllSystemsNominal View Post
Im planning to run a stock flywheel with a FM clutch. With all the vibrations that are going on at the crank with 250whp using a light weight flywheel seems like a bad idea
The flywheel side of the crank is held in place by the rest of the drive-train, worry about the oil-pump end instead.
Or are you planning to use 250+hp while free revving (or slipping the clutch massively)?
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Old 10-18-2012, 02:59 PM   #24
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Quote:
Originally Posted by AllSystemsNominal View Post
Just curious were you running a stock or lightened flywheel ?

Im planning to run a stock flywheel with a FM clutch. With all the vibrations that are going on at the crank with 250whp using a light weight flywheel seems like a bad idea
Yes I was using a lightened flywheel. Shouldn't of been why it blew up though it was balanced and I had the stock harmonic balancer.
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Old 10-18-2012, 11:01 PM   #25
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Fwiw I was using the fidanza FW with 244hp 218Tq and it felt fine and never gave me a problem
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Old 10-19-2012, 01:32 AM   #26
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Fwiw I was using the fidanza FW with 244hp 218Tq and it felt fine and never gave me a problem
how many miles at 244whp and with what kind of abuse ?
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Old 10-19-2012, 10:30 AM   #27
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I have an ACT 13lb flywheel and it's great except if you like high load, low rpm driving. If you do your transmission will rattle, otherwise it allows for faster, smoother shifting. I've only had it for ~5000km.

Again, YMMV.
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Old 10-19-2012, 05:41 PM   #28
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Quote:
Originally Posted by thirdgen View Post
Where is Paul when you need him...
All I can say is: stock block, gt2560, 18ish psi...319whp.
Paul actually sold his car and put that money into a business or something a few years back if I heard correctly.

There have been a few GT2560's on stock bottom ends making around 300hp reliably throughout the years. Saint_Foo was also pushing right around that much on his setup, and I know he beat the **** out of it. One thing is that just about every gt2560 making that sort of power is on an absurdflow setup.
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Old 10-20-2012, 08:58 PM   #29
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So when it comes time that I start tuning the spark am I correct in my thinking that the way to tell if my timing is too far retarded would be

1. get an EGT probe and watch for high temps (which I havent really planned to use on my setup)

2. Watch the AFRs and see if they start going richer
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Old 10-20-2012, 09:14 PM   #30
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egt and afr won't tell you if you reached mbt.
well, egt might but still I wouldn't trust that at all.
only way to know is to get on a dyno and keep advancing til it stops making power or knocks. or you can do the whole butt dyno/virtual dyno thing but not as accurate.
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Old 10-20-2012, 09:41 PM   #31
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Under 4k Im not really going for MBT. Id like to keep torque down a little lower than most people making 240-250whp in an effort to keep from bending rods. I should beable to keep the torque down by retarding the timing. But dont want to go too low and cause issues
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Old 10-20-2012, 09:43 PM   #32
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so stay in the range most have it at and don't sweat it

I just see no reason to get an egt sensor/gauge unless you just want to

not running boost control going straight off the wastegate is the best way
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