Bill Verburg

no, the SAi air pump isn't needed except to please the emissions *****. , A vram engine needs 2 signals, 1 for the central resonance flap and 1 for the 6 intake tubes(vram). This is from memory now, you need to look at the wiring for a US '95 and say '97 RoW, but as I recall the SAI pin on a US 95 serves the same purpose as the RoW Vram resonance pin and the '95 resonance pin serves the purpose of the RoW vram. When you add a RoW vram chip it sends the resonance signal through the old SAI wire which needs to be connected to the Vram resonance flap and the vram signal goes through the old resonance flap wire to the vram solenoid. This all presupposes that you use a RoW compatible chip like I did.

As for the vacuum, yes ,you need it and in fact I ended up increasing the depth of the vacuum well. I installed a vram egg carton vac res in the left rear wheel well. Then had issues(which may have been vac leak related) so I added a second vacuum res from a '95 993( I think I cornered the market on '95 vac cans as I bought 3 extras for my other car which has a '95 engine in it but only used 1), The electric signals just actaute solenoids that allow the vac. to do the actual work

North Coast Cab

Great. I don't need the emissions so that will save some $$
I am having trouble finding the vacuum reservoir in PET. Can you point me in that direction?
I am taking the harness to the pros this weekend to verify it has been updated and work for the v-ram upgrade. The only tag on has this #993.607.323.00

FlatSix911

Based on real world torque graphs the difference is 12 to 18 ft.lbs. and a well tuned chip can equal the mid range gains for far less cash...

JM993

Respectfully disagree. See Steve W's comment earlier in this thread.

JM993

The vacuum tank you want is 993 110 691 01 (see illustration 107-14).

This is not an insignificant project. Note that there are a significant number of other parts you will need for this conversion. Also, for those of us who want to retain our A/C, note that the routing of the lines (and the lines themselves) on v-ram cars are different.

I'm planning on doing a how-to write up on this later this winter (unless someone beats me to it).

JM993

Oops, I blew the part number. It's actually 993 110 060 00.

Bill Verburg

When I t'ped my 3.8RS vram into my '95 I retained all the stock A/C


It doesn't look factory but it's acceptable

the '95 993 vac cans I have are 993.110.140.03 they bolt to the ventral face of the intake manifold on the drivers side.

the '96 up vram egg carton vac res. are 993.110.060.00 and mount in the drivers side rear wheel well near the carbon can.

JM993

Agreed. Great job on improvising the 95 lines to route around the engine. Did you move the original 95 intake manifold mount for the a/c lines to the fan housing or did you make a new one? I'm also curious how you secured the lines on the driver's frame rail.

Thanks Bill.

Thanks

Gus

Bill - It looks like you used the smaller vacuum canister over the large multiball shaped one - Does the smaller one work OK - Am just starting on conversion and trying to round up all the parts to make the change on a 964- figuring out all the lines and where to run is an issue.

clubsport1

My '95 Vram has the egg carton resevoir, under the left side rear arch....I get the clunking of solenoids activating as I turn on/off, so i assume all is well...is thre any advantage to fitting the extra resevoir?

Gus

Isn't that a vacuum canister on the left side just behind the heater air duct pipe. Looks like it is the stock vacuum canister that is normally hooked to the back side of intake filter housing on the right side of the engine bay (as you look at it) - Was just thinking that you used this as the vacuum canister because it is the only one I could see - so you have this one and the egg carton - what do you use this one for??

guards red

Gus,

the one your looking at is the small one fitted to the none varioram cars that is used to work the rsonance flap only. The varioram cars do not use this cannister, they use the larger one fitted in the wheel arch at the driver's side. The small one on it's own does not have enough capacity to work the varioram system and the resonace flap on the fly. Additionally later cars AC system use the cannister to supply vacuum to run the heater flaps.

If you're carring out the conversion go for the bigger vacuum cannister, they're cheap and do the job as Porsche intended. I've seen the smaller ones used in tandem, two minimum, but the're not enough room to mount them and still retain the heater motor etc.

Regards
GR

Gus

Bill - Read back to your earlier notes -
"As for the vacuum, yes ,you need it and in fact I ended up increasing the depth of the vacuum well. I installed a vram egg carton vac res in the left rear wheel well. Then had issues(which may have been vac leak related) so I added a second vacuum res from a '95 993( I think I cornered the market on '95 vac cans as I bought 3 extras for my other car which has a '95 engine in it but only used 1), The electric signals just actaute solenoids that allow the vac. to do the actual work"
You added the second canister because of leaks ??
Do you have an extra egg carton canister I can get from you ?- Think some one was looking for this part number - it's "A 171 820 603"
I need to get a vacuum unit (solenoid)- 993 110 462 02- as am missing this then 3 change over valves 996 605 123 01. Also need to get a hand full of the small elbow vacuum line fittings.
The biggest item I need is the rubber air box 993 110 385 02 (between the throttle body and the mass air flow) Plus I have to adapt my 964 idle speed adjuster to this configuration - then figure out the wiring issues from the DME to the engine. I only will have one control wire for the resonance flap which exist that I can use - will have to wire all change over valves using this connection to activate the solenoids. Fun -

Gus

GR - thanks - that clears up the question - looking for the larger canister - Figuring out how to use what I can use from my current set up is the interesting side of this. Hopefully I will not having to spring for too many extra parts other than what I am missing listed above (prior note). It is hard trying to figure out all the lines and hose connections, about as bad as trying to find the correct wires.

Bill Verburg

I have both, originally an egg carton from a '96 -98 was installed in the wheel well, I later had vacuum issues which were probably a leak, but the second '95 vac. can was Tee'd in to deepen the vac. well potential. I could probably remove the second one but being a belts and suspenders guy choose to leave it.