Spec V, first build, about $1000
02-14-2007, 07:00 AM
#51
0.5 BAR
Thread Starter
Join Date: Dec 2006
Posts: 141
Re: Spec V, first build, about $1000
The trans is built by http://www.aichikikai.co.jp/english/, not a nissan tranny, and is the same 6 speed used in the VQ powered Maxima and Altima SE-R, just with a diffrent bell housing, same trans used in the v-6 Hyundai Tiburon. So there is good head room on the transmission as far as power handling. Not going to handle 500 HP forever, but......... it's not garbage, it's built for a v-6, LSD too, no one tire burnouts at the track. <--- facts.
I understand where you're comming from, but sometimes all you see on forums is the really bad or really good.
The pencil thin rods aren't a flaw.......... they're that way to lighten the rotating assembly. That means for the car maker: better power output, higher gas mileage, lower emissions, cost savings. Are all new motors like this? You'll find comprimises somewhere. Once you start reducing back pressure and modding the motor the heavy pistons on the dill weed rods become more of an issue at higher RPMs. As the exhaust is emptied form the cylinders with less effort there is less dampening force acting aganist the inertia forces around TDC exhaust stroke, rods will see higher loads.
I've got to leave for work. I'll try to fact it up, I'm not a fan boi blinded by nissan love.
I understand where you're comming from, but sometimes all you see on forums is the really bad or really good.
The pencil thin rods aren't a flaw.......... they're that way to lighten the rotating assembly. That means for the car maker: better power output, higher gas mileage, lower emissions, cost savings. Are all new motors like this? You'll find comprimises somewhere. Once you start reducing back pressure and modding the motor the heavy pistons on the dill weed rods become more of an issue at higher RPMs. As the exhaust is emptied form the cylinders with less effort there is less dampening force acting aganist the inertia forces around TDC exhaust stroke, rods will see higher loads.
I've got to leave for work. I'll try to fact it up, I'm not a fan boi blinded by nissan love.
02-14-2007, 12:47 PM
#53
0.5 BAR
Thread Starter
Join Date: Dec 2006
Posts: 141
Re: Spec V, first build, about $1000
Originally Posted by Joseph Davis
That's the sort of ---- I like to hear. 
So enter "exhaust back pressure" and exhaust stroke. If we can agree that the highest tensil loads on the rod occure around or at TDC on the exhaust stroke, then the increased exhaust effort caused by sticking a turbo in the exhaust, and the higher volume of exhaust gasses to evacuate actually act to decrease inertial loads on the rod TDC exhaust stroke.
Exhaust gas introduced into the cylinder, during cylinder filling or as residual from the exhaust cycle, either through an EGR system or exhaust reversion (see cam overlap and increased exhaust back pressure) act to lower cylinder peak pressures by making combustion less efficent. Less peak pressure = more timing can be run or higher compression w/ FI and some exhaust recirculation so long as the exhaust isn't bring too much heat with it. Turbo cams (less overlap) tipically mean less timing because of improved cylinder filling AND less exhaust reversion = higher peak pressures.
Back to work......... parts came in......
The increase in cylinder pressure due to burning way more fuel and air act to increase compressive loads on the con rod, but not as much as you would think. Doubling the HP output does not double cylinder pressures, or compressive forces seen by the rod. I'll find the math.
You can have rod failure on an up stroke or down stroke. Failure on a down stroke is usually more catastrophic because the piston will continue traveling downward and make contact with rotating assembly. Failure on an upward stroke *somtimes* will spare the what's left of the piston rod part and whats left rotating smacking event, sometimes.
03-03-2007, 09:30 PM
#55
0.5 BAR
Thread Starter
Join Date: Dec 2006
Posts: 141
Re: Spec V, first build, about $1000
^^^^^^ CspecRun is picking one up
I'm going to pick up a block sunday. It'll be used to mock up and fab downpipes.
The way it'll work:
I'll only take on a 1-2 at a time, deposit required, 2-4 weeks turnaround. (will change once I can do them quicker)
To ensure quality and proper fittment:
If using an autoboost manifold, send your turbine housing. If using another manifold send manifold & turbine housing.
I'm going to start by offering 2.5" downpipes, 3" will come later.
You can get it with the wastegate recirculated or an open dump, your call.
Let me know the number of O2 bungs you need (factory sensor(s), wideband, 02-03 have both on downpipe, so 3 for an 02-03 and a wideband, 2 for an 04+)
I will do them 2 ways, a patch in downpipe, meaning it will need to be fitted into the existing exhaust, or a factory flange, meaning it will bolt the head pipe (what incorrectly gets called a "downpipe") with no modification. Both have pros and cons, but you can get it your way
Price will be around $225 shipped mild or aluminized steel only. If you want them wrapped with heat wrap I can do that too, for a little extra, just let me know.
I'm not going to do IC piping, BUT/BECAUSE it will be available from Treadstone soon, 2.5" aluminum, polished, mandrel bent, with HKS SSQ flange, silicone, and t- bolt clamps, also B15 spesific IC mounting brackets will be available for use with a Treadstone TR-8 intercooler.
I'm going to pick up a block sunday. It'll be used to mock up and fab downpipes.
The way it'll work:
I'll only take on a 1-2 at a time, deposit required, 2-4 weeks turnaround. (will change once I can do them quicker)
To ensure quality and proper fittment:
If using an autoboost manifold, send your turbine housing. If using another manifold send manifold & turbine housing.
I'm going to start by offering 2.5" downpipes, 3" will come later.
You can get it with the wastegate recirculated or an open dump, your call.
Let me know the number of O2 bungs you need (factory sensor(s), wideband, 02-03 have both on downpipe, so 3 for an 02-03 and a wideband, 2 for an 04+)
I will do them 2 ways, a patch in downpipe, meaning it will need to be fitted into the existing exhaust, or a factory flange, meaning it will bolt the head pipe (what incorrectly gets called a "downpipe") with no modification. Both have pros and cons, but you can get it your way
Price will be around $225 shipped mild or aluminized steel only. If you want them wrapped with heat wrap I can do that too, for a little extra, just let me know.
I'm not going to do IC piping, BUT/BECAUSE it will be available from Treadstone soon, 2.5" aluminum, polished, mandrel bent, with HKS SSQ flange, silicone, and t- bolt clamps, also B15 spesific IC mounting brackets will be available for use with a Treadstone TR-8 intercooler.
