Performance Heads
01-07-2006, 08:41 PM
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Performance Heads
01-08-2006, 09:11 AM
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maybe its a secret so nobody will copy their idea. or it doesnt do diddly squat. i dont think that port work will do much, crawford tried it and i dont think they got the numbers they were looking for. They didnt even break 300 whp from what i remember. Or they did and it wasnt worth it for the amount of power they lost below.
01-08-2006, 12:33 PM
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Originally Posted by plumpzz
thats almost the same setup richie from australia went with..he doesn't expect power but he expects high RPM, bigger power band and no piston float.
do you mean piston slap or valve float.....i am unaware of the term piston float.
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01-08-2006, 12:58 PM
#8
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Originally Posted by FatBoy1
For that price it does'nt matter...
well it includes more than the nismo heads does, so i think its a good deal. in the end it only cost you 3750+ shipping which isnt bad for what you get.
01-12-2006, 12:23 AM
#13
These are not stock heads which are ported so i wouldnt compare these to them plus your getting another set of heads so its always going to cost more than just porting the ones you've already got.
The power these make will not be all up top as it also increases your compression ratio to about 12:1, these gains will be seen everywhere.
The power these make will not be all up top as it also increases your compression ratio to about 12:1, these gains will be seen everywhere.
Last edited by mchapman; 01-12-2006 at 12:26 AM.
I'm a nubb.
01-12-2006, 09:52 PM
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Originally Posted by mchapman
These are not stock heads which are ported so i wouldnt compare these to them plus your getting another set of heads so its always going to cost more than just porting the ones you've already got.
The power these make will not be all up top as it also increases your compression ratio to about 12:1, these gains will be seen everywhere.
The power these make will not be all up top as it also increases your compression ratio to about 12:1, these gains will be seen everywhere.
01-12-2006, 10:12 PM
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from that link
Z1 VQ35 Reworked performance Head Package includes:
- Z1 performance cams/springs
- Substantial FI portwork
- Ferrea 1mm Oversize Valves
- Ferrea dual Coil valve springs
- Ferrea Titanium Retainers
- Ferrea Spring Seat Locators
- Completely Reworked VQ Heads
There is a refundable $750 core charge added to the price of the heads. To recieve the core charge back we must recieve a complete set of reworkable heads assmbled with cams and all cam caps in the factory location.
looks like its for forced induction to me because it says substantial FI portwork. it's just the stock heads rebuilt and you have to return yours unless you wanna pay the core charge
Z1 VQ35 Reworked performance Head Package includes:
- Z1 performance cams/springs
- Substantial FI portwork
- Ferrea 1mm Oversize Valves
- Ferrea dual Coil valve springs
- Ferrea Titanium Retainers
- Ferrea Spring Seat Locators
- Completely Reworked VQ Heads
There is a refundable $750 core charge added to the price of the heads. To recieve the core charge back we must recieve a complete set of reworkable heads assmbled with cams and all cam caps in the factory location.
looks like its for forced induction to me because it says substantial FI portwork. it's just the stock heads rebuilt and you have to return yours unless you wanna pay the core charge
01-13-2006, 01:20 AM
#18
Originally Posted by thawk408
Are you sure it raises your compression?
These would be FI heads as they have 1mm oversize valves. The stock valves are rather large already and going 1mm oversize may actually reduce air velocity on an NA motor. The Nismo heads are actually 1mm undersize but they flow alot more than the stock heads.
Last edited by mchapman; 01-13-2006 at 01:24 AM.
01-13-2006, 02:14 AM
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Murray,
The Nismo spec 1 heads don't give a lot more flow in terms of air (that was why I don't understand why would nismo bother to release it)... but Spec 2 heads are a lot better though!!!
Here is the flow test from Nismo with their heads compare to the standard ones.
cheers,
richie
The Nismo spec 1 heads don't give a lot more flow in terms of air (that was why I don't understand why would nismo bother to release it)... but Spec 2 heads are a lot better though!!!
Here is the flow test from Nismo with their heads compare to the standard ones.
cheers,
richie