dmhenderson's Nismo '12 GTM supercharged build thread where I freak out a lot

[theDreamer]

It will all come down to the tune, weather and type of dyno.

[dmhenderson]

It'll be a dynojet dyno and it will be the middle of july so ...hot.

As for the tune, we're going to take the pre-flash we get from GTM and then tweak it.

[Baer383]

Originally Posted by dmhenderson

It'll be a dynojet dyno and it will be the middle of july so ...hot.

As for the tune, we're going to take the pre-flash we get from GTM and then tweak it.

I'm at 516 now, as far as the GTM Tune it's good but very rich you will probably start at 440-455 first pull and work from there.

[dmhenderson]

So you still haven't explained why you would be at 516 but I woudn't assuming we tune it...?

[dmhenderson]

Seems to be some concern as well that at 500+ whp, the piston rings will fry inside of 50k miles (that would be bad). Any thoughts?

[Chuck33079]

Assuming you're going to hit 500, 516 is 3.2% off. That's well within the range of dyno variance.

[Baer383]

Originally Posted by dmhenderson

Seems to be some concern as well that at 500+ whp, the piston rings will fry inside of 50k miles (that would be bad). Any thoughts?

Don't worry about the number (HP or TQ ) Sam told me when the engine finds the tune it likes the numbers will be there,

Your worrying about stuff that won't happen.

Just dial in the tune play around with the a/f (mine likes it rich on the top end) and your tuner will see the sweet spot.

[dmhenderson]

Originally Posted by dmhenderson

Seems to be some concern as well that at 500+ whp, the piston rings will fry inside of 50k miles (that would be bad). Any thoughts?

This is a major concern. I don't have another 3k to blow on piston rings and a motor teardown right now

Anyone?

[sixpax]

Originally Posted by dmhenderson

This is a major concern. I don't have another 3k to blow on piston rings and a motor teardown right now

Anyone?

I would guess it depends on how you drive it after it has attained 500+ HP ... drive it like you stole it all the time or take it to the track every other weekend then I don't think it will last as long. Probably not going to blow up, but it definitely will not live as long a life as a NA motor.

[dmhenderson]

Rare track (Drag strip) use and just conventional driving / some "spirited driving" otherwise.

[Chuck33079]

If the tune is conservative and spot on, and you maintain the car appropriately, I wouldn't expect you to have any issues. I was told by the shop that installed my TT kit that as long as I stopped at 500 whp, it would last a long time.

[MJB]

Originally Posted by dmhenderson

Seems to be some concern as well that at 500+ whp, the piston rings will fry inside of 50k miles (that would be bad). Any thoughts?

Hey man I wasn't trying to scare or discourage you about the build.. I just meant as far as long term reliability goes, its a risk you have to be willing to take. I mean, that comes with the territory when you are going to be making almost 50% more power compared to stock. I guess thats why a good rule of thumb when going boost is to have an emergency fund set aside just in case. Know what I mean?

[Chuck33079]

If you boost a car that left the factory as NA without an "emergency motor fund" or daily driver you can use while you fix the Z, you're doing it wrong.

[dmhenderson]

I should be ok so long as it doesn't happen like 2000 miles after the SC goes in.
(my "emergency fund" was swallowed whole by this build)

[theDreamer]

You should be fine, just keep up with maintenance and monitor the car regularly.
Not sure I have the highest, but one of the longest running boosted cars with over 40k miles with boost.