Shooting for 30 mpg with my '92 Mark VII.

[The_Jed]

You thought right, it is the 5.0 GT engine.

All Mark VII engines were close to the same...well except the BMW sourced Diesel. I nearly bought one of those, kind of wish I would have. A diesel Mark VII + T5 + 2.73 rear gears = high mpg!

There were a few changes up to late m.y. 1987 then from '88-'92 they were all the same, regardless of submodel. I had an '87 LSC with true flat top pistons (no valve reliefs) and E6 heads. It made slightly less power than my '92; 200 hp and 285 lb/ft vs 225 hp and 300 lb/ft, respectively.

Before '87 they had the lo-po version of the s.e.f.i. fuel injection system. And before THAT they had a central throttle body similar to GM's TBI. I'm not sure of the specs on either of those.

[The_Jed]

That Q45 is one slick car!

I'd love to get my grubby little paws on one of those or an LS400.

[The_Jed]

I've been doing quite a bit of research on afr tuning and achieving stoichiometric combustion. I still have a LOT to learn.

[The_Jed]

Today I removed the o.e. mudflaps then slapped together an air dam out of some leftover bits from a work shelf kit.
Baby steps...

[mcrews]

Originally Posted by The_Jed

That Q45 is one slick car!

I'd love to get my grubby little paws on one of those or an LS400.

Thank you!! 270000 trouble free miles! Am going to get an 05-06 last yr, in 2014!

[cosmick]

Stoichiometry is the job of the closed-loop part of the EFI. Some years ago was the last published comparison of aftermarket ignition systems on the 5.0 you have, the MSD showed the most torque at all RPM, and the best idle. When you begin completely burning all the fuel, not as much will need to be injected for any given throttle opening. You'll still need x amount of air for your cruise RPM, however.
And for that, you don't have that much more drag than a 'stang, and you may already know this, but yours came with 3.27:1 axle gears and 225/60R16 tires, while the 'stang had 2.73:1 with 225/55R16s, so that's known good, but many '83-'86 F150s had 2.47:1 rear axle gears you can swap into your rear axle if you want to try even less RPM.
If you do come across a set of those, I'm curious which of the 3 possible tooth counts Ford went with. ( 42/17 or 47/19 or 37/15. I suspect the latter, but the old 9-inch used the first )

[The_Jed]

Mine *should* have 3.27 gears, according to the diff tag, but it has 3.55 gears. I've crunched the numbers dozens of times and I always get within .05 of 3.55:1.
My first Mark VII should have had 3.27's but it had 3.73's.
Interesting tidbit about the truck gears, I did not know that!

[bhazard]

Originally Posted by The_Jed

Nice Turbo Coupe!
Is there a thread on it or do you have any more pics?

It was my first car and I haven't had it in a few years now. Sold it to my friend as a parts car (it was pretty well done for) for his autocross bird

[The_Jed]

I've read all about that car!!!
Unreal fabrication ability.

It's a small wor... internet!

[mcrews]

Originally Posted by The_Jed

It's a small wor... internet!

The Q45 had been on several websites and forums. When I sold the Q, several people who called said they were very familiar w it from the internet. Kinda took me by surprise.