Just wanted to share my frustrations (3L uim related)

[mindtrip1016]

I finally got the time to bend my own EGR tube out of 1/2" copper tubing. I had the smart idea to buy the cheap spring type slide on pipe benders. This type of bender is not for the weak. I am tired, sore and sweaty. Anyways, I was on my final bend when I get knocked on my butt with one peice of the copper tubing still in my hand and the rest of it in the bench vise. Luckily I had only broken off 6" of the 24" peice, so I was able to salvage enough to get the job done. After much measuring, bending with finesse, I am finished with the custom ghetto rigged EGR tube. I put it all back together and my car runs like crap. I checked under the hood and one of the connectors on a fuel injector is not all the way plugged in. I take the uim back off to fix it. While I am bolting the uim back on, I realize that the green tube that plugs into the top of the EGR solenoid is stuck between two of the runners. I stand up to straighten my back and it suddenly starts to rain. A heavy down poor at that. So here I am inside, venting my frustrations to people all across the world.

[mindtrip1016]

Turned out to be a not so bad day after all. I swapped the SVT butterfly and throttle plate over to the 3L casting. While it was taken apart I did the optimization how-to found on TeamNECO. That in itself made a huge difference in throttle response. Highly recommended! With the unrestricted throttle body bypass built into the 3L tb, I experienced throttle hang. I quickly got rid of that by drilling two holes in the lexan plate I made about a month back to block the IACV holes on the manifold. I drilled the incoming hole small and the outgoing hole the size of the port. This plate acts as a restrictor plate like the 1/2" copper cap would in the bypass tube on a 2.5L intake. The EGR tube is holding up perfectly so far and well worth the sweat and grunting.

[PuckPuck]

ok i'm confused about this IAC plate...

looking at the pics in vids/pics you rigged your IAC similar to how I have it with 1/2" copper tubing... and you can see this lexan plate mounted onto the manifold... are you saying you drilled this lexan plate? if you did you are allowing unmetered, unfiltered air to enter the engine...

[slockin]

Sounds like you have the IAC mounted on top of the 3L UIM like it's "supposed" to be. Any hood clearance issues?

-Nick

[exigent]

I looked at the 3.0 manifold sitting on my bench tonight... i can honestly say i dont think its worth it. Perhaps over stock but definatly not over an extude honed or svt manifold. I deftinatly dont think all that fuss over the egr is worth it either. Just block the port and direct your efforts to preventing a CEL.


Try this. Pull the vaccume line off the egr valve. This tube "sucks" whenever the evr solinoid opens... this just happens to be the same time the DPFM sensor expects a pressure differential across the egr tube. Follow me? Use that to your advantage! Take the line from the solinoid and put a tee in it. Plug one of the lines from the egr tube into one end... then use a piece of hose on the other end to another tee. Now.. on the second tee put the other line from the egr tube and a tiny little breather filter. (dont want dirt sucked in)


Now... this *should* cause a pressure diferential between the two lines when the solinoid opens. This may not be the exactly correct amount of differnetial... but with a code reader and some experimenting you can get the proper amount of differntial and keep the CEL light from coming on.


This way... you simply plug up the exhaust manifold bung and make an aluminum plate to bolt over the place where the egr enters the upper intake manifold.

Viola... no egr and no CEL.

Oh... but dont do it. You are defeating an emmision control device. But then again. Its an off road race only vehicle right???? :) Just make sure you hide and or make this look stock and it shouldnt really attract attention.

[mindtrip1016]

Originally posted by: PuckPuck
ok i'm confused about this IAC plate...

looking at the pics in vids/pics you rigged your IAC similar to how I have it with 1/2" copper tubing... and you can see this lexan plate mounted onto the manifold... are you saying you drilled this lexan plate? if you did you are allowing unmetered, unfiltered air to enter the engine...


Yes, yes and no. I did have my IAC relatively similiar to yours with copper tubing and heater hose. Last weekend I swapped over to the 3L TB, because when the engine would get hot, a kink would form in the IAC hose and restrict air flow. I could have rerouted the hose, but I didn't have enough on hand. The lexan plate that once covered the IAC ports on the manifold, now has two holes in it. The outgoing side is port matched and the incoming has a small off center hole to restrict some air flow and reduce throttle hang. The IAC now sits on top of the manifold, where it belongs with a lexan restrictor plate between them. With the hood closed it does not rub, but under medium to hard acceleration it does. Not to the point where it can be heard. It doesn't even leave a dent, just a scratch that can be buffed out. I have an old thin refrigerator magnet that now serves the purpose of protecting the underside of my hood from scratches. --- thanks to my local realtor.

Exigent: You are right. This mod may not be for everyone. It was worth it to me just to save $600+ from purchasing the SVT uim. Something that may have helped the installation process of the EGR is if I had bought the 3L EGR. Then I would only have had an inch or two of tubing to connect. I couldn't find a junk yard that would sell the EGR tube with out the exhaust manifold. I like your way of thinking. Your idea of defeating the EGR, without a CEL sounds good. I think the hardest part would be finding a tee that would fit both 1/2" tubing and however small that green hose is on top of the EGR solenoid.

[slockin]

Originally posted by: mindtrip1016
The IAC now sits on top of the manifold, where it belongs with a lexan restrictor plate between them. With the hood closed it does not rub, but under medium to hard acceleration it does. Not to the point where it can be heard. It doesn't even leave a dent, just a scratch that can be buffed out. I have an old thin refrigerator magnet that now serves the purpose of protecting the underside of my hood from scratches. --- thanks to my local realtor.

Do you have the front motor mount inserts? I wonder if they could keep the motor from moving enough to scratch the hood.

-Nick

[mindtrip1016]

Originally posted by: slockin
[Q
Do you have the front motor mount inserts? I wonder if they could keep the motor from moving enough to scratch the hood.

-Nick

I have the stock motor mounts.

[Blackcoog]

I have energy suspension inserts and it still rubbed just a bit.

[CATerina]

I will be doing this mod soon. Any tips? I have the Throttle body, UIM, EGR and IAC from the 3.0L

[exigent]

I just measured the 3.0 manifold in my garage... its 32/30mm the stock upper is 30/28mm I dont remember what the svt is... but iir its 32/30...

I just noticed on thing though... the ports arnt split... I always thought they were... but they arnt.. they just have a "wedge" between the ports. I dunno just caught me off guard.

I agree its much cheaper then the svt upper... but at the same time I wonder if its worth all the work :) Id like to see an actual dyno.

[jojolmnop]

yeah, i measured the same thing just now. i thought that the dh svt upper was 34mm?? oh well, with the shared port, it'll be easier to port this one out. i hope the gasket is bigger.

[exigent]

I will say that the 3.0 upper lends itself to porting much easier then ours... if you simply cut the entire back off the manifold you have access to all the runners.... you could port and polish the whole thing easily and then have the back welded back on. then... operating from the throttle body neck it would be posible to smooth the weld if nesasary.

[RodneyBur]

Originally posted by: exigent
I will say that the 3.0 upper lends itself to porting much easier then ours... if you simply cut the entire back off the manifold you have access to all the runners.... you could port and polish the whole thing easily and then have the back welded back on. then... operating from the throttle body neck it would be posible to smooth the weld if nesasary.

If you could do that I'd be willing to pay $$$$$

[Jagular]

I could do it for you. I do port work quite often. I also have a TIG welder and am proficcient at welding aluminum. Probably for 100.00

[jojolmnop]

i just properly measured my svt lim and the 3.0L upper and this is what i got:

svt lim = 35mm
3.0L uim = 30mm

so looks like we have a big bottleneck there. the gasket between the uim and lim is 35mm so it is just fitting around the ports of the svt lim. now for the fun part of porting out the uim a little more. from what i can tell, the runners are plenty thick where porting the uim provides still some room so doing the runners will not do much b/c the ports max size is still smaller. that's if i want to use the gasket w/o modification. still a step up from stock nonetheless.