Pulley down!? ATI D1 kit...
Pulley down!? ATI D1 kit... I am wondering what your guys thoughts are on pulleying down so I can make power sooner in the RPM band rather than wind out to 7k to make the 550rwhp I make now. Right now it makes 8.5psi at 7k rpms, but I am wondering if pulleying down would be beneficial. Correct me if I am wrong here, I am still learning. But by pulleying down I should make more boost sooner in the RPM band, which would allow me to shift sooner and take some stress off the motor. I would imagine if I did pulley down the car might see around 10psi at 7k rpms, but I would no longer take it up that high, as I would be making more power sooner. Does this make any sense? My car also has a cam and upgraded valvetrain in it.
Basically I need to upgrade to the fluidampener pulley anyways, and I figured while I was doing that I may as well pulley down for more boost. On the street the car doesnt see more than 5psi mostly because I use regular street tires and they just spin! So, I really only beat on the car at the track.
Basically I need to upgrade to the fluidampener pulley anyways, and I figured while I was doing that I may as well pulley down for more boost. On the street the car doesnt see more than 5psi mostly because I use regular street tires and they just spin! So, I really only beat on the car at the track.
Yes you are on the right track, and your car will indeed bring boost in sooner at wide open throttle. The problem is that you may find it hard to shortshift, when all the power is building, which could lead to the big bang theory... Bob
your rev limitor would have to be set much earlier Mick. it can be done and probably is a bit smarter too. anything over 6500 rpms is asking a lot for the ls1 on a regular basis.
the tune would have to change as well. creating more cylinder pressure earlier in teh rpm range will not be a good thing unless the tune changes.
the tune would have to change as well. creating more cylinder pressure earlier in teh rpm range will not be a good thing unless the tune changes.
Originally Posted by gator's 99TA
your rev limitor would have to be set much earlier Mick. it can be done and probably is a bit smarter too. anything over 6500 rpms is asking a lot for the ls1 on a regular basis.
the tune would have to change as well. creating more cylinder pressure earlier in teh rpm range will not be a good thing unless the tune changes.
the tune would have to change as well. creating more cylinder pressure earlier in teh rpm range will not be a good thing unless the tune changes.
Seems reasonable. I would say the most important thing you need to consider and NOT exceed is the max S/C head rpm limit. (65000 rpm for an ATI P-1SC). Or you will experience the big-bang theory Bob mentioned. Call the mfr & tell them your setup & they'll tell you the new max rpm.
Originally Posted by WAHUSKER
Seems reasonable. I would say the most important thing you need to consider and NOT exceed is the max S/C head rpm limit. (65000 rpm for an ATI P-1SC). Or you will experience the big-bang theory Bob mentioned. Call the mfr & tell them your setup & they'll tell you the new max rpm.
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Originally Posted by gator's 99TA
trakday is only running 7 psi i believe in a 346" motor. he wont be close to overspinning teh blower, esp on a 6 or 8 rib.
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Originally Posted by JAILBAIT
if you go to a larger pulley you are going to then have to think about bigger injectors
I take it you have the 4.5" pulley on it now. With a good tune it would be safe for you to up your boost to 8 psi, so along with lowering your rpm you could also pick up some top end power. You could try a 3.85" pulley, which would require shifting much sooner, possibly at 6000 rpm. Bob
Originally Posted by TrakDay
Well I went ahead and ordered my parts today! Bob at EPP hooked it up pretty good.
3.85" pulley and Fluidamper are on the way.
Thanks Bob!!!
3.85" pulley and Fluidamper are on the way.
Thanks Bob!!!