Several months ago, I found a PI intake for cheap. I finally got around to installing it and I'm very happy with the result. It feels like a completely different engine above 4000 now.
The intake was from a police interceptor and had a foam glove around it to protect it from heat. I kept that piece and installed it too. The install was pretty simple and the PI intake literally slid into place easier than the NPI intake came out.
The power gain with the PI intake is very noticible. I already had PI cams and an offroad H pipe, so the NPI intake was really holding the car back. I found myself actually hitting the rev limiter today, which is only 5700. I had never hit the rev limiter before because there was no reason to rev it that high before. Here is a my review of the modifications I've done to date:
Stock: Torque dropped off starting at 3800 and it was pretty much done making power by 4500, but I reved it to 4800 at the track. It ran 14.6 in the 1/4 with a poor 2.3 60' time.
O/R H pipe: Definitely added torque all around and gave a bit more power on the top end. I felt a 5100-5200 to be a good shift point and ran 14.2 in the 1/4.
Drop in K&N: No noticible change in power, but I don't have to replace paper filters now.
Underdrive pullies: if I rev it high enough (and out of the power band), I could feel a slight difference. They were free, so why not.
PI cams: these were a huge PITA to install, but I pulled the front cover to replace the guides while I was in there. They gave a little more top end again. I felt like 5500 was a good shift point, but the power gain was very subtle and quite high in the rev range, without much additional torque.
Tweecer: I added 4* of timing and lean out the top end quite a bit. It just made a bit more torque all around, but a pretty subtle gain
PI intake: I bet a 5800 shift point would be good, but the rev limiter is getting in my way at 5700. The car pulls much harder above 4000. This by far the biggest power gain, but it was the last major restriction too. I can understand why everyone says gears, gears gears now. In stock form, the 3.27 gears were a nice match for the power band which ended at 4500. Now, some gears would really help to keep the engine in the newly formed power band from 4000-5700.
Pretty soon, I'll put the tweecer back on this car (it is on the 88 at the moment) and see how it feels. I'll fine tune the AFs, add the timing back in, and raise the rev limiter a bit. I really need to get it to the track to set a new time though. That's a lot of changes since I ran 14.2.
The intake was from a police interceptor and had a foam glove around it to protect it from heat. I kept that piece and installed it too. The install was pretty simple and the PI intake literally slid into place easier than the NPI intake came out.
The power gain with the PI intake is very noticible. I already had PI cams and an offroad H pipe, so the NPI intake was really holding the car back. I found myself actually hitting the rev limiter today, which is only 5700. I had never hit the rev limiter before because there was no reason to rev it that high before. Here is a my review of the modifications I've done to date:
Stock: Torque dropped off starting at 3800 and it was pretty much done making power by 4500, but I reved it to 4800 at the track. It ran 14.6 in the 1/4 with a poor 2.3 60' time.
O/R H pipe: Definitely added torque all around and gave a bit more power on the top end. I felt a 5100-5200 to be a good shift point and ran 14.2 in the 1/4.
Drop in K&N: No noticible change in power, but I don't have to replace paper filters now.
Underdrive pullies: if I rev it high enough (and out of the power band), I could feel a slight difference. They were free, so why not.
PI cams: these were a huge PITA to install, but I pulled the front cover to replace the guides while I was in there. They gave a little more top end again. I felt like 5500 was a good shift point, but the power gain was very subtle and quite high in the rev range, without much additional torque.
Tweecer: I added 4* of timing and lean out the top end quite a bit. It just made a bit more torque all around, but a pretty subtle gain
PI intake: I bet a 5800 shift point would be good, but the rev limiter is getting in my way at 5700. The car pulls much harder above 4000. This by far the biggest power gain, but it was the last major restriction too. I can understand why everyone says gears, gears gears now. In stock form, the 3.27 gears were a nice match for the power band which ended at 4500. Now, some gears would really help to keep the engine in the newly formed power band from 4000-5700.
Pretty soon, I'll put the tweecer back on this car (it is on the 88 at the moment) and see how it feels. I'll fine tune the AFs, add the timing back in, and raise the rev limiter a bit. I really need to get it to the track to set a new time though. That's a lot of changes since I ran 14.2.