SN-95 + vortech questions
09-23-2007, 04:22 PM
#11
Underboss
Join Date: Jan 2006
Location: Helaware
Posts: 20,273
RE: SN-95 + vortech questions
ORIGINAL: 2000GT4.6
IMO if you want to do a PI swap + blower what you should do is the PI swap, do the blower, and then run methanol injection. The methanol injection should compensate for the higher compression ratios, stop the motor from pining/detonation in other words, and you will make ALOT more power with the PI setup.
The PI swap doesn't increase the compression THAT much, the meth should more than compensate.
IMO if you want to do a PI swap + blower what you should do is the PI swap, do the blower, and then run methanol injection. The methanol injection should compensate for the higher compression ratios, stop the motor from pining/detonation in other words, and you will make ALOT more power with the PI setup.
The PI swap doesn't increase the compression THAT much, the meth should more than compensate.
09-23-2007, 08:23 PM
#12
5th Gear Member
Join Date: Jul 2006
Location: carlisle PA
Posts: 3,007
RE: SN-95 + vortech questions
ORIGINAL: lizzyfan
Correct, had that setup for almost a year with no problems! Compression=Power!!
ORIGINAL: 2000GT4.6
IMO if you want to do a PI swap + blower what you should do is the PI swap, do the blower, and then run methanol injection. The methanol injection should compensate for the higher compression ratios, stop the motor from pining/detonation in other words, and you will make ALOT more power with the PI setup.
The PI swap doesn't increase the compression THAT much, the meth should more than compensate.
IMO if you want to do a PI swap + blower what you should do is the PI swap, do the blower, and then run methanol injection. The methanol injection should compensate for the higher compression ratios, stop the motor from pining/detonation in other words, and you will make ALOT more power with the PI setup.
The PI swap doesn't increase the compression THAT much, the meth should more than compensate.
09-23-2007, 10:19 PM
#13
Underboss
Join Date: Jan 2006
Location: Helaware
Posts: 20,273
RE: SN-95 + vortech questions
ORIGINAL: silverstang1996
ahh i gotcha, like i said i wasn't sure if it'd be safe since the swap bumps it up to like 10-2.5:1 compression, then S/C ontop of that. what compression were you at lizzy?(when you had s/c & PI swap). and what is the highest, safest comp. ratio you should go to on those motors?
ORIGINAL: lizzyfan
Correct, had that setup for almost a year with no problems! Compression=Power!!
ORIGINAL: 2000GT4.6
IMO if you want to do a PI swap + blower what you should do is the PI swap, do the blower, and then run methanol injection. The methanol injection should compensate for the higher compression ratios, stop the motor from pining/detonation in other words, and you will make ALOT more power with the PI setup.
The PI swap doesn't increase the compression THAT much, the meth should more than compensate.
IMO if you want to do a PI swap + blower what you should do is the PI swap, do the blower, and then run methanol injection. The methanol injection should compensate for the higher compression ratios, stop the motor from pining/detonation in other words, and you will make ALOT more power with the PI setup.
The PI swap doesn't increase the compression THAT much, the meth should more than compensate.
09-23-2007, 10:34 PM
#14
2nd Gear Member
Join Date: Nov 2006
Location: Bergen County, New Jersey
Posts: 477
RE: SN-95 + vortech questions
Increased compression on a S/C'd vehicle doesnt really come into effect as a true detriment until you start getting into the higher boost areas.
A 10.5 compression with 6-8psi and a GOOD TUNE (Remember, it is always the TUNE that makes the difference) Will be fine.
Honestly, if you do not want to bump the compression, do the PI Intake/Cams swap. The main problem with the NPI's is their HORRIBLE power band- the Intake and Cams will make it pull to redline just like the PI's do. Not to mention it still gives you 85% of the power of a PI swap.
The only time you need to do the FULL swap is when you want to do aftermarket cams- NPI heads cannot lift as high as aftermarket cams demand.
A 10.5 compression with 6-8psi and a GOOD TUNE (Remember, it is always the TUNE that makes the difference) Will be fine.
Honestly, if you do not want to bump the compression, do the PI Intake/Cams swap. The main problem with the NPI's is their HORRIBLE power band- the Intake and Cams will make it pull to redline just like the PI's do. Not to mention it still gives you 85% of the power of a PI swap.
The only time you need to do the FULL swap is when you want to do aftermarket cams- NPI heads cannot lift as high as aftermarket cams demand.
09-24-2007, 07:24 AM
#15
3rd Gear Member
Join Date: Apr 2007
Location: Georgia
Posts: 931
RE: SN-95 + vortech questions
That 10.5:1 compression ratio mythfor the pi swap is wrong from what Tim @ mph said. Its more like 11.47:1. That's what he told me when I got my car tuned on the 15th. But he tuned my car to run 8psi with an innercooler and made 376rwhp, so a good tune with a pi swapped motor and boost is possible. That's with 10.5* of timing tho lol, he said he normally runs pi cars at 17*.
09-24-2007, 08:45 AM
#17
4th Gear Member
Thread Starter
Join Date: Oct 2006
Location: NC
Posts: 1,185
RE: SN-95 + vortech questions
Ok, but let's look at it this way. Why don't I just s/c the car right now and not add the PI swap at all? I mean, I can always port and polish the heads and give it more hp that way at the same compression correct? Add a set of blower cams and I'm running more HP than the block can take. I'll have to start forging the internals at that point. Correct me if I'm wrong, but PI is not the only way to go. I plan to have my car a long time, so what's wrong with waiting another year and saving enough up to get either VT (or any other) heads and some blower cams?
09-24-2007, 11:57 AM
#19
Underboss
Join Date: Jan 2006
Location: Helaware
Posts: 20,273
RE: SN-95 + vortech questions
ORIGINAL: trickdriller
Ok, but let's look at it this way. Why don't I just s/c the car right now and not add the PI swap at all? I mean, I can always port and polish the heads and give it more hp that way at the same compression correct?
Ok, but let's look at it this way. Why don't I just s/c the car right now and not add the PI swap at all? I mean, I can always port and polish the heads and give it more hp that way at the same compression correct?
09-24-2007, 11:59 AM
#20
2nd Gear Member
Join Date: Nov 2006
Location: Bergen County, New Jersey
Posts: 477
RE: SN-95 + vortech questions
ORIGINAL: trickdriller
Ok, but let's look at it this way. Why don't I just s/c the car right now and not add the PI swap at all? I mean, I can always port and polish the heads and give it more hp that way at the same compression correct? Add a set of blower cams and I'm running more HP than the block can take. I'll have to start forging the internals at that point. Correct me if I'm wrong, but PI is not the only way to go. I plan to have my car a long time, so what's wrong with waiting another year and saving enough up to get either VT (or any other) heads and some blower cams?
Ok, but let's look at it this way. Why don't I just s/c the car right now and not add the PI swap at all? I mean, I can always port and polish the heads and give it more hp that way at the same compression correct? Add a set of blower cams and I'm running more HP than the block can take. I'll have to start forging the internals at that point. Correct me if I'm wrong, but PI is not the only way to go. I plan to have my car a long time, so what's wrong with waiting another year and saving enough up to get either VT (or any other) heads and some blower cams?