3400 Swap Into a 95 Z26

[95BlackRoseZ26]

I posted this over on beretta.net and haven't gotten any responses yet so I figured I'd throw it up on here and maybe some of you could help. I know some of the stuff might be specific to this swap in a beretta only, but any help is appreciated.

I'm getting ready to swap a 3400 into my 95 OBDI Z26. After reading the 3400swap.com guide and looking around on beretta.net and 60degree v6 I still have a few questions. For reference, my donor engine is from a 2002 grand am.

1. Fuel Injectors
This seems to be a highgly debateable topic. So far I've read that the 3400 injectors will run too rich, or on the other hand that they'll be fine as long as I use the 3400 regulator and fuel rails. Most of the swaps that I've read about have used the 3100 injectors, rails, and regulators. I'd definitely like to use the 3400 stuff if I can, being that it has 12k miles on it compared to 150k on my 3100 stuff. I know if I do that I will have to redo my injector harness for the 3400 injector connectors, which is no problem in my mind. However, will this run too rich on my stock 3100 computer?

2. EGR
I know that everyone that has done this swap so far has either blocked off the egr or used an adapter plate on a 97-99 upper manifold. If I have to I will take this route. However, I'm pretty sure my new engine will include the 2002 egr (I won't have the engine till tomorrow). Is there any way to adapt this egr electrically to my OBDI system? It doesn't seem like anyone has tried this so I guess I would be the guinea pig. Although, being that I haven't looked at the two egr's side by side yet, maybe theres an obvious reason it won't work? If anybody has ideas on this or advice it'd be greatly appreciated. It'd be great if I didn't have to buy an adapter plate and a new upper intake.

3. Exhaust & Manifolds
I know that the position/angle on the rear 3400 manifold means it won't bolt up to my current downpipe. Of course I'd like to use the 3400 manifold since it flows better. My question is will I have problems with heat and my steering rack if I do? I intend to call an exhaust shop before I do this and see how much it would cost to just make a new downpipe and connect it to my current exhaust. It doesn't seem like it should be too much. Also, I remember reading that it would be easier for the exhaust shop if I had the downpipe from a 3400 car, then they could just attach this to my exhaust. Is this true?

4. Coolant Pipes/Heater Core Hoses
In reading the 3400 swap guide, it says to use one heater core hose from the 95 and one from the 99+ grand am. Now this of course deals with a 95 grand am. Is the same true for a beretta? In other words, could I use one of my current hoses and then the other one from my 2002 grand am engine? Also, the coolant line that attaches to the top of the waterpump housing (the one with the bleeder valve across the front of the engine, right above the valve cover) is currently messed up on my car. The bleeder screw is completely stripped out. In other words, I'm hoping that this isn't the line from 95 that I need. If it is, what is the part number so that I can order a new one? If this is the one that I'm supposed to use off the 99+ than hopefully my new engine will include it.

[korbendallas68]

Fuel Injectors:
They will work, BUT since your ECU is not set for their higher lbs. rating, your car will run not like it should. It will also cause problems down the road when the Torque Converter kicks in when driving (Very severe vibrations). Just use the 3100 injectors, rail, fpr. It will make it easier than changing your fuel injector harness. And your will run better, I really have not noticed any loss in power by switching, it may have made it better?? Idk...

EGR:
Nope, you can not modify the EGR to work with your OBDI ECU. Your '95's is a digital EGR and the '96+ is a linear design. The upper intaker mani is only $55... The plate should be very, very cheap to make.

Exhaust:
Just swap out the 3400's rear mani's for the easiest route. Or yes, you can bring it in to a shop, and they can figure out a plan for you. You must have the 3400 down pipe in order to connect to the 3400's rear mani (someone coreect me if I'm wrong on that!) It prolly won't be cheap... Mine wasn't for some reason... You should not have problems with the steering rack or anything back there. Its a tight fit for the oxygen sensor though.

Coolant:
Well I need to make some changes to that part... I had to use the Push-On type for the heads... I really didn't want to fuss around with tapping a hole... I could of used the stock hoses from the '95 if I would have tapped out the hole and use the 3100's screw type pipe on the lower intake mani. I jusr mentioned the 99 hose sause it looks like it fits pretty good... I currantly am using my own hose I made... (I had to get the car running before I got the '99 hose.)
And yes, the messed up pipe you described is the one you will need. I couldn't tell you the part numbers right now. I still need to find them and update the site. Your 99 will have the pipe on it, but its way, way to far away from where its supposed to be. (the other one I mentioned before is the shorter pipe connected to where the thermostat is, under the TB)

-Ryan

[95BlackRoseZ26]

So the big question I have left is still with the exhaust manifolds. You have the 3400 manifold and a custom downpipe then Ryan? And haven't had problems with heat and the steering rack? Sorry to ask again, I'm just getting different things from different people, I'm being told on beretta.net that I'll have problems with melting my rack. However, it seems like berettas and grand ams are pretty similar.

So if I were to use that coolant pipe from the 99 grand am, it would properly attach to the lower intake without tapping a hole, yet still hook up to my heater core properly? It'd be nice to not have to tap that hole and worry about cracking the manifold or something.

One last thing, I'm using the 3 wire ect sensor from a 97 minivan for my temp gauge, what cars can I get the plug that plugs into this sensor from? (other than the minivans obviously, I don't see too many of them in yards around here) Thanks for the help.

[Cliff8928]

I fried my rack boot and bushings from the heat (i currently have a stock heat-wrap from a twincam Grand Am, don't know how well that will hold up)

The Coolant pipes will be in the wrong spot, you're best off just tapping the hole and making it fit like original (or else the heater hose has to go up and around the brake booster, and back around, that's how mine is for now) I believe it requires a 5/8 NPT hole?

That 3-wire sensor was also used oin the 1996 berettas aswell.. And i think that paticular plug was used for an A/C pressure switch too.. and maybe even the TPS?



Cliff Scott
89 BerettaGT <-3400/5speed
89 Volvo740

[korbendallas68]

Yeah, I used the 3400 rear mani, and had the exhuast shop rip me off and make a custom downpipe... lol, oh well, it works great.

I have not had one problem with the heat from the downpipe... It really doesn't not seem to be too close to the steering rack.

And like cliff said, you can use the 3400's stock location without tapping any hole. You will just have to use a new heater hose. I made my own, kinda a little long, but it works great. I may tap the hole out later, or see about the '99 heater core hose.
You're close Cliff, the hole size is 1/2in NPT. Remember though, if you use the 3400's pipe, it will get in the way of the transmission's dip stick! Do not bend it while its in the manifold still. You will damange it. That would suck.

The 3-wire plug is used on every GM vehicle that you could ever find (basically every one...) Yup, your right, its used on the TPS, A/C, ect... If you need one, let me know, I think I have one laying around the garage somewhere...

-Ryan

[95BlackRoseZ26]

The big problem I'm having at the moment is finding a place that carries the tap I need. I know it's a 1/2" NPT, but what does NPT stand for? I told them that at the parts store and they had no clue. I'm guessing it's something like a national pipe tap? Am I anywhere close? Anyways, so I went to home depot and lowes asking for a 1/2" pipe tap and neither place had one that big. Anybody know a good place online I could get one from?

[bszopi]

I got mine from Ace Hardware... and yes, NPT does stand for something like that, I want to say Nominal Pipe Tap.

[Cliff8928]

National Pipe Taper

just ask for a pipe thread tap... they'll know what it is..

Oh, and i didn't have to worry about any darned trans dipstick... it's WAY down there (5speed)

Cliff Scott
89 BerettaGT
89 Volvo740

[CNCguy]

The big problem I'm having at the moment is finding a place that carries the tap I need. .... Anybody know a good place online I could get one from?

If you haven't found one yet, you can get one at MSC Industrial. Price is $9.18 & shipping.

(Link deleted for its insane length by sappyse107)


Also, J&L Industrial has them for $15.15 delivered.

http://www.jlindustrial.com/catalog/product.jsp?id=TPT-26155L

Hope that helps.
Marc

[95BlackRoseZ26]

I noticed the ones that you linked to are 1/2"-14 NPT, what does this 14 stand for? Maybe a thread count? Just to double check then, is the 1/2"-14 the one that I want? Thanks for the links too.

[CNCguy]

I noticed the ones that you linked to are 1/2"-14 NPT, what does this 14 stand for? Maybe a thread count? Just to double check then, is the 1/2"-14 the one that I want? Thanks for the links too.

14 is the number of threads per inch. 1/2" is the nominal inside diameter of the pipe. As to whether this is the one you need, I could not say for certain as I have not done this swap myself. But 1/2-14 NPT is usually the size for heater hose connections on most applications that I've seen. I just replied to your post as I occasionaly buy from J&L/MSC and knew they sold what you needed online.

Also the 1/2 Male NPT to 5/8" male hose adapters can be picked up in the "HELP" section at most any auto parts store if you need one.
Marc

[95BlackRoseZ26]

Does anybody who's done this know, is the 1/2"-14 NPT the one I need?

[bszopi]

I have the tap at home... I'll check it when I get there later tonight.

[95BlackRoseZ26]

Thanks! Also, I am looking for a few part numbers and was hoping someone on here would know. I would like to order them off gmpartsdirect but their catalog isn't the greatest, and my local dealer decided to come up with some stupid rule that they can't give out part numbers?!? Anyways, I need the number for the 2 rubber heater core hoses if anyone has it. I'm also looking for the number for the "water bypass pipe" (that's what the dealership called it) that runs across the front valve cover and attaches to the top of the water pump housing. This needs to be for the obd1 94-95 cars without the heated throttle body, as I don't want to have to bypass it. I don't know if these parts are the same on all the 94-95 3100 cars or not, maybe that would give me a greater chance of getting the numbers? If someone could possible verify this and/or get me these numbers it would be a huge help.

[bszopi]

Crap... I forgot to look at the tap when I got home. Arrgh!! Hopefully I'll remember tonight.

As far as the part numbers go, I should be able to get those for you. I have the part lists on microfiche for 91-96 Berettas. I just need to bring them to school with me so I can use the viewer and find what you are looking for. Give me a few days and I should be able to get everything for you.