Driveability woes (please help) - 07/09/06 03:17 AM
I just got my built-to-the-hilt 3L hybrid back on the road! I was going to do a true dual exhaust system on it and had planned on using the stock Y. So I cut it apart. I'm taking a new job and moving so I needed it to run. I didn't want to take the chance of it rubbing the ground. Nor did I like the idea of putting the pipes under the tank (which is what I would have done). I was searching some old posts and Demon said that it didn't feel like he gained a lot of power but the transition was smoother. So I guess it wouldn't help much anyways. So I had ordered a MSDS Y from Marty. After getting the headers and now the Y I honestly have to say that they make killer stuff! And that comes from a guy that owns a set of Kooks headers.
Anyways my situation is a bit unique. I honed out the secondaries 2mm (from 34-36). I then backed off the secondary linkage being that the butterflys are slightly oval.
This is where I think I get my driveability problem. I only pull 15.5"hg at idle at 800 RPM. It sometimes has a rolling idle and revvs up to 2K then pulls 20"hg but will go down after a few seconds. It also holds higher RPMs when I go to shift.
I'm confident that I do not have an external vac leak.
I have a CEL and 6 codes (4 hard and 2 pending). All catalyst monitor related so they are negligable.
The only PIDs that were off were my LT fuel trims which were both at 17. Makes sence being that I am using the SVT injectors and it still thinks that it is a 2.5l. The other PID that was off was my BARO. For my altitude, 153-154 is perfect. I am at 162.
I think that this is just the nature of the beast.
So my question is can this problem be tuned out via Excal2 or is this out of it's limits? I tried a few searches but came up with people that had porblems after optimizing TBs.
Also since I got your attention, the 96 block that I used had a much bigger hole for the KS. So big that I the bolt will not go through the KS. Any suggestions? W/o any advance (I have 0* of advance at idle). This thing runs like [censored]! Honestly I think my old 2.5 would take it. Their is much more power to be had.
Here is a list of my mods...
3L Hybrid
-3L valves
-ported heads
-Secondaries honed 2MM
-heads, secondaries, and UIM all port matched on the secondary (primaries left alone)
-MSDS headers and Y
-Unorthadox (I think.. was on the car...) pulley
-Some high flow K&N FIPK (one again on the car...)
-CR 11.25:1
-65MM TB
-Magnaflow Mufflers
-FRPP wires
THANKS!!
Anyways my situation is a bit unique. I honed out the secondaries 2mm (from 34-36). I then backed off the secondary linkage being that the butterflys are slightly oval.
This is where I think I get my driveability problem. I only pull 15.5"hg at idle at 800 RPM. It sometimes has a rolling idle and revvs up to 2K then pulls 20"hg but will go down after a few seconds. It also holds higher RPMs when I go to shift.
I'm confident that I do not have an external vac leak.
I have a CEL and 6 codes (4 hard and 2 pending). All catalyst monitor related so they are negligable.
The only PIDs that were off were my LT fuel trims which were both at 17. Makes sence being that I am using the SVT injectors and it still thinks that it is a 2.5l. The other PID that was off was my BARO. For my altitude, 153-154 is perfect. I am at 162.
I think that this is just the nature of the beast.
So my question is can this problem be tuned out via Excal2 or is this out of it's limits? I tried a few searches but came up with people that had porblems after optimizing TBs.
Also since I got your attention, the 96 block that I used had a much bigger hole for the KS. So big that I the bolt will not go through the KS. Any suggestions? W/o any advance (I have 0* of advance at idle). This thing runs like [censored]! Honestly I think my old 2.5 would take it. Their is much more power to be had.
Here is a list of my mods...
3L Hybrid
-3L valves
-ported heads
-Secondaries honed 2MM
-heads, secondaries, and UIM all port matched on the secondary (primaries left alone)
-MSDS headers and Y
-Unorthadox (I think.. was on the car...) pulley
-Some high flow K&N FIPK (one again on the car...)
-CR 11.25:1
-65MM TB
-Magnaflow Mufflers
-FRPP wires
THANKS!!