3100 carbed into a Fiero

[trotterlg]

OK, here is the deal. I have this 3100 running with a carb. No O2 sensor, no EGR, no crank sensor, in fact the only sensors on the engine are the temp sensor at the thermostat housing and the oil pressure sensor in it's normal location. It does have the spedo sensor on the transmission but that is not on the engine. I have a fuel pressure regulator to get the fuel pressure down to 3 psi for the carb, I think I need to know what to do with the other connections, like jump them? leave them hang? anything to trick the car into running with this setup. I kind of think it will throw some codes, but all I want it to do is run the fule pump and it would be nice if the tach worked as well as the oil pressure and the temp gauge. Any suggestions? Anyone done this? For those who haven't seen the setup here is a little video: PS, it has points in the distributator.

Here is a short video of the thing running:

[95b4u]

this is awesome.
im sorry i have nothing to contribute to your questions, but do you have a build thread anywhere for this? lol

[trotterlg]

No build thread, I do have quite a few pictures, but it is basically a 3100 with iron head pistons for about a 12 to 1 CR, flat tappet custom cam with LS6 valve springs and roller rockers. Has a custom intake with a quadrajet carb and a modified marine mechanical advance distributator with points in it. Larry

[3400-95-Modified]

Why did you switch to a flat tappet cam over the roller setup that the 3100 offers?

[trotterlg]

First off you loose about 1/3rd the weight of the lifters. The roller lifter cams are hollow with pressed on lobes and have a track record of breakage even with stock springs. Cam grinders generally don't like to work on them so your choices of cams are fewer. Then there is the cost, a flat tappet setup is about 1/4 the cost of a roller setup if you are looking for something other than stock. It is also a lot simpler. Larry

[3400-95-Modified]

There are tons of profiles avilable for roller cams that are solid core on the WOT-Tech store. Maybe a long time ago yes not many wanted to grind them, but with what Ben has done almost any Comp XFI lobe or Thumper lobe can be ground onto a roller cam for our engines. Yes they may be a bit more expensive but the roller design makes them last so much longer and removes any chance of wiping off a lobe.

I got my cam back in 07, BEFORE there were all these grinds available, I have contemplated many times changing what I have but just never took the leap.

it's about $490 for a custom roller profile cam with proper length pushrods... That's really not too bad.

I can't argue the lower valve train weight though, if that was your overall goal then you got what you wanted.

[trotterlg]

What I did was buy a new performance cam and had it ground a little hotter, that was two years ago. Even so I think the cam, lifters pushords and grind on the cam the cost was only about $175.00. Doubt with an engine like this that you should expect much more than 25,000 miles even though every thing is new in it. If I were going for a long term daily driver then I would have built it a lot differently. Larry

[3400-95-Modified]

Thats ok, lately with my timing chain issues I'm on like a 4k mile plan... LOL I just need something that will LAST!

[trotterlg]

Have you tried just using a bone stock timing set? Some times I think that the fancy stuff just creates a bunch of issues that the people who diesigned them didn't think could happen. There are so many things that can go wrong, when you add them all up it seems that just one little thing can hose up an entire system in an engine, and it is proably something that no one would ever think of. I try to use stock items unless there is some compelling reason to go after market, the poeple who have built a million engines probably have it firured out fairly well. Larry

[caffeine]

I think the issue is that with a FWD timing set the stock chains don't fare very well with anything more than stock valvesprings. That being said the 06+ 3500 chains seem to be ok. I've put about 10,000 kms on my Firebird already.

[3400-95-Modified]

I stretched a 3500 timing chain in 15k miles on LS1 springs with a Milzy Stage 1 cam, I then went to the 99 timing sets got a bad quality set and wrecked it quickly with my current cam and 906 comp springs in under 10k I think... Then I got a OEM GM set, sent it for cryo treatment and it lasted 4 years and then started to make noise, so I finally bought a TCE DRTC since he was running a group buy on them... and they ended up being cut wrong somehow so it stretched the chain to fit the gear profile in under 5k miles and resulted in tons of chain slack.

Other TCE people before this group buy have had no issues and the chains are readily available to replace from Cloyes if the do wear out due to mileage and not a mess up, it's just the gears are special to the motor.

This last time is due to a gear cutting error and not the aftermarket part itself holding up so once it's cut right it should be the solution to my issues. I just haven't been lucky with timing chains.

The NON vvt 3500's were 04-06 and the chain style is the same as the 00+ 3400 ones, so it's nothing special unless GM changed it in 06... the one I had from an 04 motor didn't last. 07 and up are VVT motors and I don't think the chain would fit.