Momentum kit owners
08-15-2011, 10:26 PM
#82
Registered User
Alright, kinda a newb but what the hell. I went to a local performance shop in Lewisville, texas (imported performance) and Steven told me all about the momentum ST kit. He has it on his 350 on a fully built motor and it make 550 to the wheels. I was going to have him order it and put it on my 350 but i didnt have him do it because i was told by many other shops that our motors have a Compression of 11:1 and the rods are very weak and even at 8psi the rods would snap very quickly. Also the vavle springs would be crushed at such a stress. After reading this thread, it seems like nobody is having a problem with these things.. Is this true? I have 68K on the motor so is that why everyone is telling me the rods and valve springs will break soon? or did everyone put Eagle rods and brian cowers springs in their motors? Plus, he told me that it didnt come with Uprev tuning software and he was going to have to have another place do the tuning. Do the actual kits come with UpRev tuning? I want UpRev tuning on my 350 if i get a ST kit, but i dont want to get the momentum kit if they dont come with it.
Last edited by 350_captain; 08-15-2011 at 10:29 PM.
08-15-2011, 10:44 PM
#83
just by what they have told you, you should start running from that shop. do a quick search, upgraded springs on stock cams seems to have a habit of breaking cams and FI puts no extra stress on cams, why would it its not changing anything in the valvetrain. the stress put on the valvetrain comes from extra revs which results in valve float, aka the valves are moving so fast that the springs cannot close them all the way, thats the easiest way to explain it. rods on the DE give at about 450 hp stay around 350-400 and you will be fine another quick search will show you that. finally go directly to momentums website and it says right in the parts included it comes with uprev. like i said the shops only looking to rape you without lube and then send you on your way never to return, run and find a reputable shop.
08-16-2011, 07:14 AM
#84
it comes with a pretuned reflash. If the dealer the OP wants to buy from is not an Uprev tuner, they cannot adjust the tune. So yes, the shop is correct. If the OP wants a custom dyno tune (any why wouldnt you??), it will need to go somewhere else to do it.
Last edited by str8dum1; 08-16-2011 at 07:16 AM.
08-16-2011, 06:37 PM
#86
there where other people listed in that thread that had problems though that dint have there own thread iirc. it just seems to me by his wording that the shop is telling him he HAS to buy them
that was in 1 instance on a HR (with implications of inproper install), and no such cases on a DE
it comes with a pretuned reflash. If the dealer the OP wants to buy from is not an Uprev tuner, they cannot adjust the tune. So yes, the shop is correct. If the OP wants a custom dyno tune (any why wouldnt you??), it will need to go somewhere else to do it.
it comes with a pretuned reflash. If the dealer the OP wants to buy from is not an Uprev tuner, they cannot adjust the tune. So yes, the shop is correct. If the OP wants a custom dyno tune (any why wouldnt you??), it will need to go somewhere else to do it.
08-17-2011, 02:17 AM
#87
Registered User
okay so let me get this straight.
1. The rods should be fine even though they have 68k on them and they hold up to 450hp?
2. The standard kit comes with everything aka the injectors, fuel pump and Up-Rev. (which is what i want)
3. This shop isnt trying to rip me off? This shop didnt tell me that the rods will break. Cobb tuning told me they would break.
4. Valvesprings and cams arent really needed since they only deal with drivetrain and not the engine and its stress directly?
5. In accordance to 4, if i have this shop put the Momentum standard kit on my stock block, it should be fine? ( i emphasize *should) up till about 450hp?
6. (super newb question) how do i find a reputable performance shop in my area? if this one is not good (even though they sound good)
1. The rods should be fine even though they have 68k on them and they hold up to 450hp?
2. The standard kit comes with everything aka the injectors, fuel pump and Up-Rev. (which is what i want)
3. This shop isnt trying to rip me off? This shop didnt tell me that the rods will break. Cobb tuning told me they would break.
4. Valvesprings and cams arent really needed since they only deal with drivetrain and not the engine and its stress directly?
5. In accordance to 4, if i have this shop put the Momentum standard kit on my stock block, it should be fine? ( i emphasize *should) up till about 450hp?
6. (super newb question) how do i find a reputable performance shop in my area? if this one is not good (even though they sound good)
08-17-2011, 02:37 AM
#88
okay so let me get this straight.
1. The rods should be fine even though they have 68k on them and they hold up to 450hp?
2. The standard kit comes with everything aka the injectors, fuel pump and Up-Rev. (which is what i want)
3. This shop isnt trying to rip me off? This shop didnt tell me that the rods will break. Cobb tuning told me they would break.
4. Valvesprings and cams arent really needed since they only deal with drivetrain and not the engine and its stress directly?
5. In accordance to 4, if i have this shop put the Momentum standard kit on my stock block, it should be fine? ( i emphasize *should) up till about 450hp?
6. (super newb question) how do i find a reputable performance shop in my area? if this one is not good (even though they sound good)
1. The rods should be fine even though they have 68k on them and they hold up to 450hp?
2. The standard kit comes with everything aka the injectors, fuel pump and Up-Rev. (which is what i want)
3. This shop isnt trying to rip me off? This shop didnt tell me that the rods will break. Cobb tuning told me they would break.
4. Valvesprings and cams arent really needed since they only deal with drivetrain and not the engine and its stress directly?
5. In accordance to 4, if i have this shop put the Momentum standard kit on my stock block, it should be fine? ( i emphasize *should) up till about 450hp?
6. (super newb question) how do i find a reputable performance shop in my area? if this one is not good (even though they sound good)
https://my350z.com/forum/forced-indu...for-noobs.html
https://my350z.com/forum/forced-indu...ng-thread.html
08-17-2011, 02:59 AM
#89
Registered User
08-17-2011, 06:05 AM
#90
1. who knows. its a risk that you have to decide you wanna take. cars have broke at less, some at more.
2.the standard kit has all that
3. i think there was confusion in what they told you and what was perceieved
4. no reason to even touch the heads on a stock block build
5. no one is going to guarantee that. Start basing your expectations on wheel torque. Trq breaks rods. I would not go over 380ish ft-lbs. Whatever hp that corresponds to is where i'd stop.
6. you are just bolting on parts and using a prepackaged tune. nothing special or complicated about it. Any shop could do that.
2.the standard kit has all that
3. i think there was confusion in what they told you and what was perceieved
4. no reason to even touch the heads on a stock block build
5. no one is going to guarantee that. Start basing your expectations on wheel torque. Trq breaks rods. I would not go over 380ish ft-lbs. Whatever hp that corresponds to is where i'd stop.
6. you are just bolting on parts and using a prepackaged tune. nothing special or complicated about it. Any shop could do that.
okay so let me get this straight.
1. The rods should be fine even though they have 68k on them and they hold up to 450hp?
2. The standard kit comes with everything aka the injectors, fuel pump and Up-Rev. (which is what i want)
3. This shop isnt trying to rip me off? This shop didnt tell me that the rods will break. Cobb tuning told me they would break.
4. Valvesprings and cams arent really needed since they only deal with drivetrain and not the engine and its stress directly?
5. In accordance to 4, if i have this shop put the Momentum standard kit on my stock block, it should be fine? ( i emphasize *should) up till about 450hp?
6. (super newb question) how do i find a reputable performance shop in my area? if this one is not good (even though they sound good)
1. The rods should be fine even though they have 68k on them and they hold up to 450hp?
2. The standard kit comes with everything aka the injectors, fuel pump and Up-Rev. (which is what i want)
3. This shop isnt trying to rip me off? This shop didnt tell me that the rods will break. Cobb tuning told me they would break.
4. Valvesprings and cams arent really needed since they only deal with drivetrain and not the engine and its stress directly?
5. In accordance to 4, if i have this shop put the Momentum standard kit on my stock block, it should be fine? ( i emphasize *should) up till about 450hp?
6. (super newb question) how do i find a reputable performance shop in my area? if this one is not good (even though they sound good)
Last edited by str8dum1; 08-17-2011 at 06:06 AM.
08-17-2011, 10:23 AM
#91
Vendor - Former Vendor
Join Date: Apr 2011
Location: Wilmington NC
Posts: 112
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Our tune we supply is only for standard boost, people are seeing 390-420whp(stock headers and with our headers, also with different dynos) To get around the 450whp mark, you will need to turn the boost up and have a custom tune applied.
08-19-2011, 01:25 AM
#92
Registered User
Hey Taylor, in accordance to what str8dum1 stated, what is the amount of torque that is being delivered with this kit. I know you said 390-420 hp, but what the range of torque?
08-30-2011, 04:07 PM
#96
if you are worried about blowing your engine by going FI then don't go FI. Boost on our engines is playing with fire so unless you are willing to gamble or can afford to build the motor when your engine fails...stay away. There is no such thing as playing it safe when boosting on our cars despite what anyone tells you.
