Anyone have a built motor yet for FI?
 

I just found out today that my rods are bent on my G. So now begins the long process of a motor rebuild that will be able to handle 10 lbs no problem.

For how long have you been boosted? What psi were you running? What HP?

This G had and engine built because rods bent during tuning

GTM Motorsports*::*Customer Vehicles*::*Juan.U

Edit: Here's the story on the car: http://www.the370z.com/forced-induct...-tt-build.html

Car hasnt even left the shop, I believe the turbo kit has been on the car for maybe a few weeks running. They had a few issues with the cars fuel cut, bovs leaking, and the clutch.

Monday they had everything fixed and before I was to come get the car they called and said they think the car spun a bearing. Then today they took the oil pan off and you could see the bent rods.

Stats on the car is Greddy TT kit, 8 psi, 507hp

here is the build:
Mazworx-GambitX Greddy TT build - MyG37

Are rods on a G different than on a Z? There's quite a few TT Z's out there pushing about the same if not more and I haven't heard of rod failure... yet.

should all be the same, yah thats why im in shock and pissed at the same time.

maybe if I was running 12 psi or more i would say ok i deserve it but thats not the case

Wow... that really stinks man. This thread personifies my only fear of going FI.

Two ways to look at it... crap happens, bad luck, etc.

Or shop mistake...

I'd say talk it over, calmly, with the manager or owner and look for explanations of what happened.

BTW, I've not heard of this place and have nothing against them... just saying one of two things happened.

Damn, sorry to hear that. We finally have a data point for where the stock motor may be over-taxed. The speculation forever has been 450-500WHP. Best of luck getting it all worked out. Maybe they will throw in labor and you will just have to pick up some forged internals.

this actually proves how good GTM is when working on this platform. so far don't think anybody has blown their motors installed and tuned by Sam.

What did your torque curve look like? That is really the more useful "data point" to be gained here, IMO.

OP,
Engines are not created equal.. I hope the shop steps up for you and takes some responsibility.
GL!

I wouldn't bet $ on that....

While I am sure GTM cars have had issues, I would have to say that at this point they must have the best ratio and IMO the better products for the Z34... there are GTM FI cars "all over" and to this point I haven't heard of a failure. Again, I am sure it happens but law of averages...

I mean, I agree with you and I am certainly not trying to start a GTM vs. debate. Simply pointing out that there are far more GTM builds than anything else.

no idea, they never did one from the dyno. Again things I couldnt control not being there all the time.

I can say this, Sam at GTM has been helping me with questions and concerns the entire time through the build. He is a very honest person and I wish I could have sent my car to him 3 months ago. Im sure I wouldnt have the issues I have had so far.

There still hasn't been enough FI 3.7Ls yet to come up with a "safe" HP range. There are plenty of FI 3.7Ls running over 500whp, including myself. It's all in the tune... and a little luck.

If im not mistaking the g37 weighs more than the z therefore taxing the rods even more. My auto convertible was the same problem because it was so much heavier at the same horsepower as other coupe manual zs, it had much higher loads to handle on the rods and mixed with horrible tuning is a bomb waiting to happen.

My god, give them a blowjob while youre at it. :nutswinger:

Sorry to hear about your misfortune. This is pretty scary with the technical issues you dealt with prior to engine failure.

Force feeding is a gamble, period. The only times I rev beyond 4k at wide throttle is during "testing" lol. I'd shat bricks if my engine goes kaput during normal driving. Therefore, the only real intense workout my engine is getting is getting dyno tuned.

:icon18: I was thinking that same thing.

GambitX:

Hopefully, You get everything straightened out and put down some serious power after forged internals.....:tup:

Hey man! I was only stating the facts. Isn't it true? You're such a hater!

once track season slows down a bit, our engine builder should have time to get my engine together :)

bent rods @ 500rwhp is crazy. havent been browsing the forums a lot lately, but nismo370's gtm tt stg1 @ 12psi is still holding strong.

It sure is I am the first hand witness to that. The car gets driven hard.

Then what's the point? If that's true, it seems like it would have been a lot more fun to just stay NA and spin it out.

theres so many other factors besides how much horsepower that affect the resilience of rods in an engine. timing, air/fuel ratio etc. the whole 'safe for a certain hp' thing assumes the tune is safe. If the tuner puts your car on the dyno and leans the **** of the motor with high enough boost levels (which actually don't need to be that high on a high compression motor) then you'll have knock and possibly damage, ie, what happened to your car.

so yea, the fact that you weren't making as much hp as other vq37's, doesn't automatically mean you were safe.

Well it's for the fun factor. I'm just saying it would stink for the engine to fail while casually being driven.

Well they are willing to fix the car and put it back to factory, but I have to wait 2 to 3 months and that means 8 months in the car world. NOT gonna happen

what? What about Your turbo kit? Are they removing that too?

right now guys i need a plan or I need ideas to who has rebuilt there motors with what and what compression. I need to call sam at GTM in a little bit to see what he has ready to go or if he has ideas for me.

no they want to just fix whatever is wrong in the motor and put factory parts back in it. A factory Rod is 60 there cost and a cardillo rod is like 200 each. So they are trying to save there money here.

well i can see your expectation that they would rebuilt your motor to factory spec without additional charge. However i dont think they have an obligation to pay for forged rods/pistons and give you a 'built' motor that you never had in the first place. They should rebuild your motor, and if you pay for the upgraded parts they should work out a fair price since they blew your motor

You can get a set of eagle rods shipped for 450$ also you can go with K1 rods they cost about $600. Then there are the gtm rods I think they cost $1000. You can also get a set off Wiseco pistons for $700 of the shelf 9:1 compression that will be good for your turbo set up.

Damn, it's nice enough that they'll put you back to stock... Most shops leave that on you.

buy the parts and let them install the forged internals instead of stock. Maybe they can get you the parts at their cost?

yes you have a good point, my complaint is why 2-3 months to make fix it? Thats insane. the car has been in there shop for over 2 months now for just the turbo kit install.
Im fine with them putting it back to stock, im just not going to wait 2-3 months. Also they want to give me the car back with 5lbs of boost because its obvious they are scared to blow it again because they do not know how to tune the car correctly

i personally wouldnt go all the way down to 9:1 in the VHR unless going for REALLY high boost. part of what makes this engine so amazing is all the technology behind it, and technology in engines also includes being capable of running high compression with crummy pump gas while still making decent power with advanced engine management systems.

stock engines are capable of 600rwhp if tuned right with fragile NA internals at 11:1 compression. Most guys who built their engine will never exceed 650-700rwhp. 10:1 is the lowest I would go... I am deciding on a CR right now for my extra engine, but I will probably order some custom 10:1 or 10.3:1.

not to beat a dead horse with a long post, but the VHR is really an amazing engine. I wouldnt take away part of what makes it drive so great. The fact that we have a 13.0 second car before the turbos even spool is why it drives so friggin AWESOME with turbos, cause the second they are pushing the air harder even before pressure is generated just makes this engine RIP. ever driven a car like a STI or an EVO or Supra, those cars are like 15-16 second cars if you take the turbo off, the engines drive like zombies until the turbos spin up to high boost. its an exagerated example, as even a 9:1 VHR isnt going to be that slow.... but we are in a new age here with much better engines... 9:1 is old school stuff, no need for that low to bring a VHR to 700-800hp IMHO.

i think at around 10:1, the car should still drive and feel like a mid 13 second car or so when not loading it into boost. that means a really great feeling engine.

Well after a long day of going back and forth with the shop we have decided on what to do but it isnt final yet. But as soon as its final i will let everyone know what we decided to do that will speed up this whole process and get me the car back ASAP.

Good luck!! Keep us posted.

eagle rods are meh.

The tune man....the tune and im sorry to read this.

:iagree:

This car uses Eagle Rods

Hal’s street car sets 6speed 350Z record at 9.34, VIDEO - MY350Z.COM Forums

Now that is really pushing the limit with them,I wouldn't push them that hard my self. However there are plenty of people that use them for mild builds.

Depending on a persons power goal's ,the K1 rods are a good choice.Tom Molnar the guy that runs K1 use to run Oliver racing that made rods for domestic cars for a very long time. For big power clear choice is Carrillo rods they are like $1900 though.