will 2.87 pulley blow my motor/ no internals
i am kinda wondering this as well.. i have a 3.12 now with stock injectors and fuel pump and running pig rich.. (10-10.5 via my aem uego) i am about a mile above sea level which i know has a lot to do with this with less oxigen in the air..i was told my ss box was tuned for a 2.62 pully at sea level before i bought it and i have made no changes.. would it be safe to run the 2.87?
Originally Posted by gothchick
When it comes to Vortech, I'd give serious attention to Sentry's thoughts and opinions. I think he has more experience than anyone else on the boards on the topic.
There's still a lot of people who have been running vortechs longer than me and/or have more mechanical experience with them. Certain shops know them extremely well and could run circles around me with their knowledge/experience. All I really did was do that write up and share some knowledge I've learned from reading about other people's experiences
Originally Posted by drumminguy81
i am kinda wondering this as well.. i have a 3.12 now with stock injectors and fuel pump and running pig rich.. (10-10.5 via my aem uego) i am about a mile above sea level which i know has a lot to do with this with less oxigen in the air..i was told my ss box was tuned for a 2.62 pully at sea level before i bought it and i have made no changes.. would it be safe to run the 2.87?
so if you went higher in elevation you'd run even.The most definite answer to your question is to take it to a shop and get on a dyno if you change it and see where you end up at. However IMO the stock injectors are going to really be giving you all they've got pressure-wise though. Not sure if you have a fuel pressure gauge to look at, but you don't want that too high either. It's all a huge balancing act
What kind of boost would the 2.87 make with my mods along with say a Borla exhaust? I'm hoping to keep it no higher then 10 psi on my stock block, I am hitting about 9 psi with my 3.12 but I still have the stock exhaust though I do have test pipes.
going from stock to borla exhaust I'd guess would lower your psi maybe .3 psi or so. The borla is pretty good, but it's not going to perform a miracle by itself. Nor is it extremely high flowing. I used to run one when I was NA btw
Originally Posted by gothchick
When it comes to Vortech, I'd give serious attention to Sentry's thoughts and opinions. I think he has more experience than anyone else on the boards on the topic.
Originally Posted by sentry65
going from stock to borla exhaust I'd guess would lower your psi maybe .3 psi or so. The borla is pretty good, but it's not going to perform a miracle by itself. Nor is it extremely high flowing. I used to run one when I was NA btw
I really wouldn't be worried about losing low end torque with just an exhaust with the 2.87 pulley.
With stock everything else, you could probably use a huge dual 3 inch exhaust and not really lose any significant low end tq with the 2.87 pulley because of how much air it shoves in the engine
IMO the 2.87 is dangerous if you haven't changed out either your cats or headers or cams as long as it's something else besides just a small exhaust swap.
I'm at around 11 psi with the 2.87 pulley with cams/headers/HF cats/exhaust. With just a borla and nothing else, I'd suspect you'd be closer to 13 psi which is starting to get a little dangerous on a stock engine unless you baby the car and rarely rev it high. I have to assume you like reving high though since that's the nature of the vortech. Anyway, water/meth injection might really be worth looking into if you went that route.
It really is a balancing act. The people who have tried going the cheap route with just changing one area and not matching it with changes to other things have usually ended up with problems later on.
The more you can evenly try to increase exhaust flow through the whole engine/headers/cats/exhaust, the more likely you'll eliminate bottlenecks and pressure/heat building up at certain points. The engine itself is the main place where you want to reduce the pressure/heat as much as possible. Changing just an exhaust is mainly relieving some of the pressure/heat inside the cats and trickles some of that relief down to the engine. Changing the cams, headers, and cats (just because the stock cats are so restrictive) are going to help the most with relieving pressure/heat directly from inside the engine with a supercharger...which is why those mods really suck with a roots/twin screw blower like the stillen
With stock everything else, you could probably use a huge dual 3 inch exhaust and not really lose any significant low end tq with the 2.87 pulley because of how much air it shoves in the engine
IMO the 2.87 is dangerous if you haven't changed out either your cats or headers or cams as long as it's something else besides just a small exhaust swap.
I'm at around 11 psi with the 2.87 pulley with cams/headers/HF cats/exhaust. With just a borla and nothing else, I'd suspect you'd be closer to 13 psi which is starting to get a little dangerous on a stock engine unless you baby the car and rarely rev it high. I have to assume you like reving high though since that's the nature of the vortech. Anyway, water/meth injection might really be worth looking into if you went that route.
It really is a balancing act. The people who have tried going the cheap route with just changing one area and not matching it with changes to other things have usually ended up with problems later on.
The more you can evenly try to increase exhaust flow through the whole engine/headers/cats/exhaust, the more likely you'll eliminate bottlenecks and pressure/heat building up at certain points. The engine itself is the main place where you want to reduce the pressure/heat as much as possible. Changing just an exhaust is mainly relieving some of the pressure/heat inside the cats and trickles some of that relief down to the engine. Changing the cams, headers, and cats (just because the stock cats are so restrictive) are going to help the most with relieving pressure/heat directly from inside the engine with a supercharger...which is why those mods really suck with a roots/twin screw blower like the stillen
Last edited by sentry65; Jul 31, 2008 at 04:45 PM.
Originally Posted by sentry65
I really wouldn't be worried about losing low end torque with just an exhaust with the 2.87 pulley.
With stock everything else, you could probably use a huge dual 3 inch exhaust and not really lose any significant low end tq with the 2.87 pulley because of how much air it shoves in the engine
IMO the 2.87 is dangerous if you haven't changed out either your cats or headers or cams as long as it's something else besides just a small exhaust swap.
I'm at around 11 psi with the 2.87 pulley with cams/headers/HF cats/exhaust. With just a borla and nothing else, I'd suspect you'd be closer to 13 psi which is starting to get a little dangerous on a stock engine unless you baby the car and rarely rev it high. I have to assume you like reving high though since that's the nature of the vortech. Anyway, water/meth injection might really be worth looking into if you went that route.
It really is a balancing act. The people who have tried going the cheap route with just changing one area and not matching it with changes to other things have usually ended up with problems later on.
The more you can evenly try to increase exhaust flow through the whole engine/headers/cats/exhaust, the more likely you'll eliminate bottlenecks and pressure/heat building up at certain points. The engine itself is the main place where you want to reduce the pressure/heat as much as possible. Changing just an exhaust is mainly relieving some of the pressure/heat inside the cats and trickles some of that relief down to the engine. Changing the cams, headers, and cats (just because the stock cats are so restrictive) are going to help the most with relieving pressure/heat directly from inside the engine with a supercharger...which is why those mods really suck with a roots/twin screw blower like the stillen
With stock everything else, you could probably use a huge dual 3 inch exhaust and not really lose any significant low end tq with the 2.87 pulley because of how much air it shoves in the engine
IMO the 2.87 is dangerous if you haven't changed out either your cats or headers or cams as long as it's something else besides just a small exhaust swap.
I'm at around 11 psi with the 2.87 pulley with cams/headers/HF cats/exhaust. With just a borla and nothing else, I'd suspect you'd be closer to 13 psi which is starting to get a little dangerous on a stock engine unless you baby the car and rarely rev it high. I have to assume you like reving high though since that's the nature of the vortech. Anyway, water/meth injection might really be worth looking into if you went that route.
It really is a balancing act. The people who have tried going the cheap route with just changing one area and not matching it with changes to other things have usually ended up with problems later on.
The more you can evenly try to increase exhaust flow through the whole engine/headers/cats/exhaust, the more likely you'll eliminate bottlenecks and pressure/heat building up at certain points. The engine itself is the main place where you want to reduce the pressure/heat as much as possible. Changing just an exhaust is mainly relieving some of the pressure/heat inside the cats and trickles some of that relief down to the engine. Changing the cams, headers, and cats (just because the stock cats are so restrictive) are going to help the most with relieving pressure/heat directly from inside the engine with a supercharger...which is why those mods really suck with a roots/twin screw blower like the stillen
oh yeah that's right, sorry didn't see your sig
Originally Posted by 350Z400rwhp
Thanks Sentry, I do have test pipes and meth now. I don't plan on doing cams or headers as that is just too much work without pulling the engine. I will do the exhaust (Borla True Dual) so I figure I should be close to your 11 psi as I have test pipes instead of High Flow Cats.
not sure if im special, but my 2.87 is a fairly strict 10psi, and the car is rarely there long enough to know. Typically in the auto, im shifting a good 500rpm short of 1st gear redline, then a little less for 2nd. Need a valvebody next.....
that 10 psi is only with borla and HFC
that 10 psi is only with borla and HFC
Originally Posted by turtle1678
hey sentry how much hp will cams add as opposed to running just the 2.87 with full exhaust and water/meth. I heard that they make a huge difference
pretty much. Depends on what cams you get. I have JWT cams which aren't super extreme so they seem like they gained mostly across all the rpms. I guess I wouldn't be surprised if they did lose some power below 2000 rpms, but like I care
Why is it dangerous? examples please.
Originally Posted by sentry65
I I'd suspect you'd be closer to 13 psi which is starting to get a little dangerous on a stock engine unless you baby the car and rarely rev it high.
I'm not going to go look up every example. There haven't been a ton of people willing to put 13 psi on their stock engine with a vortech. The ones who have, a good portion of them have had their engine bite the dust, though obviously not all. It partly depends on which VQ engine it is and rpms you run it at
Diesal is one example that comes to mind. Even though he was tracking the car, he was running 109 octane race gas so I doubt that was a tuning issue. Maybe it was heat, but then again isn't heat the big issue anyway with 13 psi? If he just drove it on the street, he might have been fine
Diesal is one example that comes to mind. Even though he was tracking the car, he was running 109 octane race gas so I doubt that was a tuning issue. Maybe it was heat, but then again isn't heat the big issue anyway with 13 psi? If he just drove it on the street, he might have been fine
Last edited by sentry65; Aug 5, 2008 at 10:29 AM.
Or how bout putting a 2.62 pulley on for super quick low end boost and bleed off excess boost over say 11 psi with one of these http://www.928m.com/parts/boostlimitervalve.php Then you pretty much have a wastegate for a supercharger. Would this over spin the blower with a DE motor? This is a route I am considering this winter.
