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Help with 3.4l

PA3.4l

By PA3.4l
in 986 Series (Boxster, Boxster S)

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PA3.4l Member

PA3.4l

Posted
Posted

3.4lpa 8-14-08

I have recently completed the 3.4l swap on a 98 boxster and the car runs great. I think the ecu is programed for a stock 3.4 and the rev limits at about 6600-6800rpm. Needless to say I think the car can be more aggressive than what it is. I also have Dansk 100 cel cats headers and ghl muffler. What do i need to do to get the most of this setup? Is the rev limit correct for a 3.4l

Thanks for any input

-Mitesh

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PA3.4l Member

PA3.4l

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3.4 liter rev limiter is set at 7,300 RPM.

Which program (Boxster?) did they use on which DME (version)?

The DME is 5.2.2 version found on 98 boxster. I'm not sure which program you are reffering to

-Mitesh

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PA3.4l Member

PA3.4l

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All this time I thought I had a 3.4. I will contact the guys who did the swap. Before I start going nuts. Is there a way to tell what program I have? or the fact that the rev limit is at around 6600 a good enough indicator that I have a boxster program. I'm not sure how the guys who did the swap are going to respond.

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PA3.4l Member

PA3.4l

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If I do have the wrong program should I look into getting a performance program ie. Giac chip? or do I need carrera program 1st? Do I need to have the guys who did the swap reprogram the dme or can t be done at another Inde? Lastley are there any complications in trying to run a carrera program into my 98 DME. Maybe that is why the shop didn't do it, or it wasn't part of the deal...

-Mitesh

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PA3.4l Member

PA3.4l

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Sorry Loren,

I looked at the thread but I didn't read it. Mainly becase I am not very mechanically inclined. I printed the pdf and tried to make sense of it. If my car is running the boxster program is it missing wires from the DME to the vac solenoid? resulting in me needing to -- have the DME redone, I can provide this service along with a new wire to add to the harness and instructions on calibrating the MAF to avoid running issues for $150 to contributing renntech members, $200 for non-contributing members.--- OR do I need to take my car in to A GIAC dealer and have them change the program.

Once again thank you for help

-Mitesh

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tholyoak Member

tholyoak

Posted
Posted

As a new member and one that is admitting up front that they don't have much mech. aptitude I will cut you some slack ;) but you really should search the multiple posts on this topic here. It is quite a popular subject.

If you have access to a porsche tester (PST2 or PIWIS) it is very easy to figure out if your DME is properly programmed as a 996. If it is, it will be recognized as a 996 and not a 986. You can also look and see if there has been an additional wire added to the connector that goes to the DME and runs to the actuating solenoid for the secondary plenum butterfly. Without this your 3.4L engine will not produce much more power than the 2.5L you removed.

As the soft rev-limiter is 6700 on a 2.5L boxster, I am pretty sure you are still running the 986 program in your DME.

Todd

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PA3.4l Member

PA3.4l

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This is not as easy is i thought. I found the dme under the drivers seat. From reading your pdf I am to be looking for a wire installed in position 59. Very hard to tell. Do I have to remove the seat?? Is there no other way... Again I am mechanically challenged :D

-Mitesh

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insite Member

insite

Posted
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This is not as easy is i thought. I found the dme under the drivers seat. From reading your pdf I am to be looking for a wire installed in position 59. Very hard to tell. Do I have to remove the seat?? Is there no other way... Again I am mechanically challenged :D

-Mitesh

the dme is not under the driver's seat, it is in the trunk.

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PA3.4l Member

PA3.4l

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The DME is not under the seat (that is the alarm control) it is in the rear trunk behind the carpet panel.

post-1-1219180831.jpg

Found Dme now where is pin 59. Can I see it by just looking or do I need to pull something apart

--Mitesh

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Loren Member

Loren

Posted
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Folks please READ the 3.4 liter Engine Swap PDF referenced in post 7 above.

There is only one engine carrier for a 3.4 liter -- and the engine mount is the same for all 3.4 and 3.6 liter cars.

post-1-1219460208_thumb.png

The A means the part has been replaced with an updated version.

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tholyoak Member

tholyoak

Posted
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Actually Loren, it is 964 C2 mounts that are needed at the trans end on an engine swap as these mounts are taller and drop the trans end to match the drop at the front of the motor. You do not want 993 mounts as these are the same part as the 986/996 mounts.

-Todd

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JP-"S" Member

JP-"S"

Posted
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Yep different part number! Thanks for the part number for the 964 motor mount. Unfortunately they cost 2x more then the 993 ones. And on top of that the ABS controller cost another 1600 bux....Jeez I am going to go broke doing this.

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gimmemebit Member

gimmemebit

Posted
Posted
Actually Loren, it is 964 C2 mounts that are needed at the trans end on an engine swap as these mounts are taller and drop the trans end to match the drop at the front of the motor. You do not want 993 mounts as these are the same part as the 986/996 mounts.

-Todd

Todd

I know you have done a couple 986 to 996 conversions. What do you think would be a fair price to put a 3.6 in my 2001 986 S. Please address the following: 1) Reprogram ECU, 2) Labor R & R and 3) Other fabrications etc (not incl 996 headers)

Thank you for your response.

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PA3.4l Member

PA3.4l

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So back to pin 59..... Since no one in my area has the means to read my ecu program and the guys who did the swap are 3hrs away I figgured that

If a mechanic showed me the top of the intake manifold and i saw a valve actuator arm swing open after 3000 rpm then it would be safe to say that I have the right program. Right?

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tholyoak Member

tholyoak

Posted
Posted

open the engine lid, rev the car past 3k and the actuator on the second plenum should move. If that happens you don't have the 2.5L program, whether you have the right program is not guaranteed as the red line should not be as low as you previously state.

You may also want update your profile to indicate where you are located, there may be a member nearby willing to help you out.

-Todd

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