will 2.87 pulley blow my motor/ no internals
everyone has been talking about that idea since forever. One person did manage to get a wastegate to work at some point, but the 2 or 3 other people who did actually try it weren't sucessful for whatever reason.
The problem with that idea anyway is you're going to overspin the stock blower big time. So you have to either be content with overspinning the blower and hope it doesn't fail too soon or lower your redline which ends up making the whole thing pointless unless you just really want low end power for cruising around town mainly
The problem with that idea anyway is you're going to overspin the stock blower big time. So you have to either be content with overspinning the blower and hope it doesn't fail too soon or lower your redline which ends up making the whole thing pointless unless you just really want low end power for cruising around town mainly
Last edited by sentry65; Aug 5, 2008 at 10:33 AM.
Ok so what if I just wanted to go to the 2.87 but didn't want to go over 10 psi with my stock block. Would this valve be consistent enough to bleed off that 1 or 2 lbs of boost every time or would it be safer to just go with the 2.87 and let it go to 11 or 12 psi and just tune for that. Keep in mind I do have meth.
if you have meth, you should be fine anyway. I wouldn't bother messing with wastegates unless you're really bored
a nice alternative is to go with higher flowing exhaust/headers/cats/cams, etc to lower the psi
IMO 12 psi is fine if you don't abuse the car, 13psi is starting to push your luck, and 14+psi is a time bomb waiting to go off on a stock block with a vortech
a nice alternative is to go with higher flowing exhaust/headers/cats/cams, etc to lower the psi
IMO 12 psi is fine if you don't abuse the car, 13psi is starting to push your luck, and 14+psi is a time bomb waiting to go off on a stock block with a vortech
Last edited by sentry65; Aug 5, 2008 at 11:31 AM.
What is changed on a built motor to be reliable at 13+ psi?
Or are you ASSUMING that over 13psi makes more power than the rods can handle. If thats the case, thats an ignorant statement. Just bc you increase boost, doesnt mean you'll get an increase in power.
My vortech runs 15psi and easily runs 13psi at ~5900 rpms. Its all hot air though a small exhaust. under 400 DD horsepower and way less torque.
So please explain if you are just assuming higher psi = higher power. Or is there something to do with the pressure thats addressed with a built motor??
Or are you ASSUMING that over 13psi makes more power than the rods can handle. If thats the case, thats an ignorant statement. Just bc you increase boost, doesnt mean you'll get an increase in power.
My vortech runs 15psi and easily runs 13psi at ~5900 rpms. Its all hot air though a small exhaust. under 400 DD horsepower and way less torque.
So please explain if you are just assuming higher psi = higher power. Or is there something to do with the pressure thats addressed with a built motor??
Originally Posted by sentry65
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 str8dum1; Aug 5, 2008 at 11:39 AM.
no, it has nothing to do with the rods directly
I never said higher psi = higher power.
I mean, how many times have I preached over and over against that in regards to the vortech????
psi is pressure and high pressure means high heat.
What this means for you on your car is you will saturate your engine with heat sooner than someone making the same whp as you but at a lower psi.
So if you abuse the car and drive it hard for a long time, that can lead to rod or piston damage because of the high heat. Not because of high psi itself and not because the rods are weak.
Water/meth injection is great for combating that high heat so if you're running a cooling mist kit kit like your sig says, then that's probably helping you a lot.
If you're not reving to redline you'll probably be much better off since higher revs make more heat overall than a high psi at lower revs.
Unless the person really knows what they're doing and is taking the right precautions with some combination of w/m injection, race gas, oil coolers, etc, I just don't generally advise everyone to run 14+psi at 6600 rpms on a stock engine and I think even 13 psi at 6600 rpms is slightly risky. Especially to the people stuck with 91 octane gas or who don't have a good local tuner who know VQ's
You're making the power you have not because you've maximized the efficiency of all your breathing mods, but because the blower is larger and is trying to cram more air through the system. The Si-trim blower is not as efficient as the stock blower, so you're getting more heat per psi compared to the stock blower. I personally would not be comfortable with 15psi at 6600 rpms even if it's making "only" 400whp DD which is like what? 430-440whp DJ? - that's pretty considerable as is and plenty high enough to break stuff if the tune isn't almost spot on. I'd look into higher flowing cams/headers/cats/exhaust etc because 400whp DD at 15psi is a sign that you'll gain some good power with more flow and lower your heat/psi. I don't know all the details of your car, but think cams would help you the most
I never said higher psi = higher power.
I mean, how many times have I preached over and over against that in regards to the vortech????
psi is pressure and high pressure means high heat.
What this means for you on your car is you will saturate your engine with heat sooner than someone making the same whp as you but at a lower psi.
So if you abuse the car and drive it hard for a long time, that can lead to rod or piston damage because of the high heat. Not because of high psi itself and not because the rods are weak.
Water/meth injection is great for combating that high heat so if you're running a cooling mist kit kit like your sig says, then that's probably helping you a lot.
If you're not reving to redline you'll probably be much better off since higher revs make more heat overall than a high psi at lower revs.
Unless the person really knows what they're doing and is taking the right precautions with some combination of w/m injection, race gas, oil coolers, etc, I just don't generally advise everyone to run 14+psi at 6600 rpms on a stock engine and I think even 13 psi at 6600 rpms is slightly risky. Especially to the people stuck with 91 octane gas or who don't have a good local tuner who know VQ's
You're making the power you have not because you've maximized the efficiency of all your breathing mods, but because the blower is larger and is trying to cram more air through the system. The Si-trim blower is not as efficient as the stock blower, so you're getting more heat per psi compared to the stock blower. I personally would not be comfortable with 15psi at 6600 rpms even if it's making "only" 400whp DD which is like what? 430-440whp DJ? - that's pretty considerable as is and plenty high enough to break stuff if the tune isn't almost spot on. I'd look into higher flowing cams/headers/cats/exhaust etc because 400whp DD at 15psi is a sign that you'll gain some good power with more flow and lower your heat/psi. I don't know all the details of your car, but think cams would help you the most
Last edited by sentry65; Aug 5, 2008 at 04:24 PM.
http://www.928m.com/parts/boostlimitervalve.php
I had two of these valves I was going to try on my system before I sold the Vortech . I have a good feeling that they will work great and if used with a stock blower . As long as they are installed before the IC , I think over spinnning the blower will not be harmful to it . If installed before the IC all preasure over a set psi is bled off the extra heat build up will not be there because the preasure is kept at a set level .
I had two of these valves I was going to try on my system before I sold the Vortech . I have a good feeling that they will work great and if used with a stock blower . As long as they are installed before the IC , I think over spinnning the blower will not be harmful to it . If installed before the IC all preasure over a set psi is bled off the extra heat build up will not be there because the preasure is kept at a set level .
Cool, I wasnt trying to come off as a dick. I honestly wanted to know. I run a meth setup where I see almost a 1 point drop in AF between on and off. Sharif tuned the car, so I know its solid (well need a retune as of late)
I can imagine that I can make a lot more power with this blower if i do something to the internals to increase flow. 15 psi is alot of boost. just gotta change the heat into hp!
thanks!
I can imagine that I can make a lot more power with this blower if i do something to the internals to increase flow. 15 psi is alot of boost. just gotta change the heat into hp!
thanks!
Originally Posted by sentry65
no, it has nothing to do with the rods directly
I never said higher psi = higher power.
I mean, how many times have I preached over and over against that in regards to the vortech????
psi is pressure and high pressure means high heat.
What this means for you on your car is you will saturate your engine with heat sooner than someone making the same whp as you but at a lower psi.
So if you abuse the car and drive it hard for a long time, that can lead to rod or piston damage because of the high heat. Not because of high psi and not the rods being weak.
Water/meth injection is great for combating that high heat so if you're running a cooling mist kit kit like your sig says, then that's probably helping you a lot.
If you're not reving to redline you'll probably be fine since higher revs make more heat overall than a high psi at lower revs.
Unless the person really knows what they're doing and is taking the right precautions with w/m injection and/or race gas etc, I just don't generally advise people to run 14+psi at 6600 rpms on a stock engine and think even 13 psi at 6600 rpms is slightly risky. Especially to the people stuck with 91 octane gas
You're making the power you have not because you've maximized the efficiency of all your breathing mods, but because the blower is larger and is trying to cram more air through the system. The Si-trim blower is not as efficient as the stock blower, so you're getting more heat per psi compared to the stock blower. I personally would not be comfortable with 15psi at 6600 rpms even if it's making 400whp DD (which is like what? 430-440whp DJ?). I'd look into higher flowing cams/headers/cats/exhaust etc because 400whp DD at 15psi is a sign that you'll gain some good power with more flow and lower your heat/psi
I never said higher psi = higher power.
I mean, how many times have I preached over and over against that in regards to the vortech????
psi is pressure and high pressure means high heat.
What this means for you on your car is you will saturate your engine with heat sooner than someone making the same whp as you but at a lower psi.
So if you abuse the car and drive it hard for a long time, that can lead to rod or piston damage because of the high heat. Not because of high psi and not the rods being weak.
Water/meth injection is great for combating that high heat so if you're running a cooling mist kit kit like your sig says, then that's probably helping you a lot.
If you're not reving to redline you'll probably be fine since higher revs make more heat overall than a high psi at lower revs.
Unless the person really knows what they're doing and is taking the right precautions with w/m injection and/or race gas etc, I just don't generally advise people to run 14+psi at 6600 rpms on a stock engine and think even 13 psi at 6600 rpms is slightly risky. Especially to the people stuck with 91 octane gas
You're making the power you have not because you've maximized the efficiency of all your breathing mods, but because the blower is larger and is trying to cram more air through the system. The Si-trim blower is not as efficient as the stock blower, so you're getting more heat per psi compared to the stock blower. I personally would not be comfortable with 15psi at 6600 rpms even if it's making 400whp DD (which is like what? 430-440whp DJ?). I'd look into higher flowing cams/headers/cats/exhaust etc because 400whp DD at 15psi is a sign that you'll gain some good power with more flow and lower your heat/psi
i have only 440 with 2.87 stock fuel rail, it depends on your tune im sure. We went real conservative and going to get larger injectors before anything else, but 650s i imagine good with most tunes
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