Project MIDTRBO

[Mars]

So am I. What kind of BPC are you running? I have a smooth openloop idle but can't seem to get the hunt out of closed loop idle. It oscillates up and down with a low BPC reading in the datalog suggesting a rich condition but the wideband doesn't seem to support it. There are several tables that might be involved and I have no idea where to start.

Hi, I awnsered here instead of messin up this thread...

http://www.code59.org/index.php?opti...2&id=7917#7917

[Joseph Upson]

I switched back to 8F because it was much closer to a civilized tune that had given the best offline acceleration. Now that I know a recently corrected exhaust leak might have been at work before it was loud enough for me to hear I may give it a second look in the future but at this point given how strong the car runs on just 8 psi I doubt I'll ever push boost beyond 12 psi.

Having built a twin turbo and single turbo Fiero I would never build another twin turbo Fiero even with more room to do it. I didn't have to modify the trunk for it. The single turbo is the way to go. The Fiero is not so light that you don't have to be careful about torque. I learned that lesson with the 1.8L Turbo sunbird motor swap.

[ALLTRBO]

I have a set of unused crower solid roller lifters (still need custom push-rods, of course) that I may or may not use for my own project. IF (<operative word)I feel confident that I can get good results using modified hydraulic rollers in a 7500rpm motor, then Ill part with them. (no need to pack-rat car parts, right?)

I haven't been able to find solid lifters for the Gen III in the Crower catalog. Are they older? Do you have a p/n?

The Fiero is not so light that you don't have to be careful about torque. I learned that lesson with the 1.8L Turbo sunbird motor swap.

I would think so... That's slightly more than half the displacement. I also learned my lesson with my 2 liter AWD Talon. One of the 3 things I can't stand about it (I love everything else) is that there is practically NOTHING below 3k. It is heavier, but not that much heavier.

[Joseph Upson]

I would think so... That's slightly more than half the displacement. I also learned my lesson with my 2 liter AWD Talon. One of the 3 things I can't stand about it (I love everything else) is that there is practically NOTHING below 3k. It is heavier, but not that much heavier.

Yes but this was in a 1984 model which is probably the lightest made, my registration read just under 2500 lbs and that 1.8L with the aluminum head was probably another 50 lbs or more lighter than the 2.5L. The V6 cars were upwards of about 2750 or more. My car gained 80 lbs with the new wheel and tire swap and is probably near 2900 lbs.

[pocket-rocket]

I wish my 92 was 2900 lbs... That would be like a 500 lbs diet

[ALLTRBO]

Yes but this was in a 1984 model which is probably the lightest made, my registration read just under 2500 lbs and that 1.8L with the aluminum head was probably another 50 lbs or more lighter than the 2.5L. The V6 cars were upwards of about 2750 or more. My car gained 80 lbs with the new wheel and tire swap and is probably near 2900 lbs.

I estimate that my car will actually be closer to 3000lb when it's done, there's a lot going into it (still lighter than a 'vette. ). When looking at only displacement...
2425+175 (for an average male driver) = 2600. 2600/1.8 = 1444 pounds/liter.
3000+175 = 3175. 3175/3.2 = 992 pounds/liter
Yours had 46% more weight to carry around per liter. Obviously it's the torque curves and gearing that actually matter but I'd be willing to bet that my car should have a little more off-boost punch then yours did. I hope so, anyway.

I wish my 92 was 2900 lbs... That would be like a 500 lbs diet

That's what happens when they take an iron-block pushrod design and rig up a set of massive DOHC heads onto it. :/ Okay... so it still wouldn't be 500 lbs lighter, but hey, you can carry 4 people!

[ALLTRBO]

Oh, and as far as my car's current status... I'm getting it back tomorrow morning!
It'll be on a trailer, though. It's apparently got a valve tap that I need to fix, along with a locked-out first gear, but it moves under its own power so that's a huge improvement. I've owned it for 3.5 years and I've never driven it.

Pics and video to come soon.

[TechRod]

I've owned it for 3.5 years and I've never driven it.

I can understand that one, I've been working on my car for 3.5 years and haven't driven it either.

[pocket-rocket]

That's what happens when they take an iron-block pushrod design and rig up a set of massive DOHC heads onto it. :/ Okay... so it still wouldn't be 500 lbs lighter, but hey, you can carry 4 people!

I wouldn't really call it rigging. I mean, it's just as reliable as almost any other engine out there. It's no worse than taking a 350 with a 400 crank to "rig" it into a 383 stroker after boring. They made due with what they had for little investment and based it off of a proven design. It's more like a conversion, really.

I had thought of the carrying 4 people thing, but I wasn't going to gloat since I hardly ever have more than 2 in it :/ The space is nice for carrying things though

[ALLTRBO]

Relax, I was just kidding.

Before I get into what all of the problems are, I want to hear what all of you think from what you can see/hear... here's a vid. I'm documenting everything with tons of pics, text, and video before I start working on it.

Remember, it's a TGP bottom end with a late Gen III top end.

Hmm, what happened to embedding? (Edit: now embedded) Here you go...

[ALLTRBO]

Here's one that really upsets me. No one should need to figure this one out... I don't know why this happened, the turbo was fine when I bought it.
Sorry it's so hard to see.

[bszopi]

To embed video, put the link inside VIDEO tags.

[ALLTRBO]

Ahh, okay. I was using the typical YOUTUBE tags. Thanks.

[ALLTRBO]

Here's the third and final vid for now. Note the aggravation.

[1988GTU]

You make sure you do not have an exhaust leak? That would cause the turbo to respond like so.