Ic so you think if he throws on the dyno and tunes it like it is now it will fix the misfire??? what about the low compression.... still has to be a ring gland or somthing??? SHould I just get the Wiesco pistons to save the hastle?
How much boost with a propper tune could a engine hold with just Aftermarket pistons and stock rods, aftermarket head gasket?????

 

Poping in Wiesco pistons is not going to solve your problem...

 

How so... if it is a messes ring gland or piston ring?? and then we can clean everything out and throw back on dyno. Nothing else could possibly lead to this... 380cc injector pry leaned out, I now for SURE it wasnt rich, looked at the plugs// so I can think of anything else.
Off topic though Do you think pistons alone can handle good boost or should I do rods as well since now I have the chance?????

 

IF, thats the problem and you go thru the hastle of replacing the pistons, it would be wise to do the rods at the same time.

 

I think this is what i am doing
Wiesco Pistons
Eagle Rods
Arp hardware
Head gasket

 

Thats some major sh*t. I wouldn't just jump to do that. You may be better off swaping motors if it comes to it but something sounds fishy with it.

Why couldn't you go past 5000rpms? Doesn't sound like something that bigger Injectors would solve.
Sorry to say this but it sounds like your shop is leading you to buy more and more stuff. They may be good and that could be off base but you should definitely dig deeper before jumping into an engine build.
If it comes to a rebuild you should do the rods. They are the weakest link in our cars.

 

Thats what I was thinking.. But if your going to do pistons, you might as well do rods...Oh and stay away from the Eagle rods, go Crower or Pauter its worth the extra few $$$$$..Just so you know a bottom end build, when all is done will run you some serious cash, just so you know which road your being led down..I would be more curious as to "WHY" my engine needs to be rebuilt at this point...Just a word of advice..

 

D350Z10, so your shop did a compression test, and all the cylinders were 200psi and one measured around 180psi?

If this is the case, by no means, would I began tearing down that motor until a leak down test is performaned to confirm the results. 180psi is within factory specs, but the variance between cylnder is about 6psi beyond specs. Still, IMHO, this doesnt warrant teardown of the motor.


I think its more of a tuning issue, rather than a damaged motor, IMHO.

 

If they used Maf pulldown and didn't create their own timing map(I don't even think you can with the UTEC because I have only used speed density with the cars I have tuned with it) it could have put him on a pretty advanced part of the ignition map.......boom.

 

If the engine is blown for that reason then I certainly would not have that shop do the rebuild...or touch my car again for that matter. Bring it elsewhere.

 

I agree the Z rods are junk if your doing a tear down do it right the first time dont half *** it b/c you will regret it later and end up spending more dime. sets of pistons and rods can easliy be 1100 bucks. Did you even go back to square one yet with your 380s?

 

the map sensor is needed once you make it past a certain amount of airflow through the maf and the ecu is no longer able to control the injectors. you are pushing enough power this could be the case. that could be the cause of your revs stopping at 5000.
185psi is the factory high spec on a compression check. 142 psi is recommended rebuild time. i'm kinda curious how they were able to hit 200 anyways. not too sure what to tell ya, many things could have caused a cracked ring land. possibly even one of the original injectors being clogged could have leaned out just that one cylinder. but chances are it would have set the po305 code then too.

 

Even with MAF pulldown, they would still need to create their own timing map. If they used the preloaded timing map, it would certainly damage the motor, as you would be running very advanced timing. It would be TPS based, rather than pressure, which is not a good thing with an FI car. No matter how you look at it, something smells fishy with this whole ordeal.

 

I could not have said it better myself..Especially when he called my shop and said he was using an Emanage, and tuned it himself..LMAO..

 

I doubt that was Trent...

and second... Tuning Factory (godspeed) has tuned and installed many FI Z's... not as many as Sharif! But still enough to be called experienced... I've seen them dyno tune cars... They are VERY accurate about their process and really take care of the customers! Dan and Jeff are good people up there and they dont run a shady operation as to what you guys are implying...

IMO... Trent probably shouldnt have run the 330cc injectors with that much boost and what not... Either way... Tuning Factory will get this all squared away and customers shouldnt have a negative outlook on their quality and performance because of this incident...

Thats all im trying to get at! They are solid mechanics that know what they are doing when it comes to boost! Thats why I took my car to them...

Knowing trent im sure he hit a bit of boost a few times with those 330cc in that car before they added the new ones That might have played a roll lol

 

Actually it was Trent...How many other TN 350Z's in Michigan are running a UTEC and just switched to 550CC injectors and got a #5cylinder misfire code..It was just odd the way he acted, thats all..He was telling me he used an emanage..To me that is fishy.At anyrate, no one can duiagnose his problem over the internet or phone, so Im sure his tuners have a more accurate depiction as to what is going on with his car..

 

wow... either way it wasnt tuning factories problem... that car was running smooth when it left the shop after the dyno... and Trent knew not to take it over 5000 rpm otherwise the car runs outta the efficient amt of fuel cuz of the little injectors... even a little bip above could do damage really quickly know what I mean?

All im saying is TF are good people! I didnt want to see their name start to be taken down because of a incident that wasnt in their hands! Thats all!

 

If I understand correctly, he had 380cc injectors (cause thats what the kit comes with) and then they installed the UTEC but did not tune it at all (setup for MAF-based N/A stock vehicle w/ smaller STOCK injectors). He drove off and damaged his engine. The stock injectors are smaller than the 380's so it would have run rich if it was a stock tune. Still sounds fishy.
Why bother leaving the UTEC plugged in until its tuned for the setup? Its an easy plug-in/out. Someone exercised poor judgement imo.
Anyhow, hate to hear this stuff and hope it ends up being something simple.

 

Guys Guys... The Tuning is NOT THE ISSUE, I spoke to Jeff today and he told me they used speed density with the map sensor and perfect timing... If they wouldn't have the car wouldn't have even BOOSTED on the dyno... The negative talk about the company is not doing anything, THE entire issuse is the 380cc Injector in cyclinder 5 was runing to rich because the spark plugs were Drenched in fuel so fuel pry sprayed the cyclinder wall and caused a piston ring or a ring gland to crack... I had the tn kit installed with the re-flash at first, and then didnt even boost and waited for the UTEC so I could at least drive the car and get other things done, ONCE UTEC came Tuned with speed density and map + a boost solonoid wont work with a MAF.... so off course the tuned the right way... come on guys The Tuning Factory had DONE SOOO MANY greddy tt Z's and perfect results. IT is not the company. So back to the problem, the Car was tuned and found that injectors maxed out at 5k rpms and wouldnt tune further but did tune and pull timing and adjust fuel... MY A/F was PERFECT... so what most likely happend is the injector couldn't hold it.... That is the only reasonalble thing.. The are taking apart the engine right now and finding the exact problem, SINCE they are taking it apart I have the chance to get a motor build because the entire cost is the labor so I brought that up and I want to be safe and not run into this ****. So please enough negative talk about my SPONSER SHOP... trust me they are not trying to make money off of me lol....

 

I hope you dont think FI.com was talking negatively about your shop, becuase we never do that, and that certainly was not our intention.

I do question, however, why they are tearing down a motor that has 180psi cylinder pressure in one, and 200psi of pressure in the other 5. Factory spec is 160psi or higher.

Just trying to help you out here.