• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

Rumors about T/Cing and Economy


Kdawg532

New Member
Joined
Jan 11, 2008
Messages
762
Reaction score
1
Points
0
Location
Keymar,Maryland
Vehicle Year
2007
Make / Model
Ford
Engine Size
3.0 V6 God's gift to man
Transmission
Manual
not to jack my own thread or anything but shady i like your sig man i like it. who quoted it??
anyway back to subject, it would be a fun summer long project tho
 


AllanD

TRS Technical Staff
TRS Technical Advisor
Joined
Jun 1, 2001
Messages
7,897
Reaction score
134
Points
63
Age
62
Location
East-Central Pennsylvania
Vehicle Year
1987... sorta
Make / Model
Ford
Engine Size
'93 4.0
Transmission
Manual
Theory be damned I know the turbo cars were more capable of exceptional mileage
for one basic reason, they had "reserve power" that you only need to use intermittently
rather than a very common situation of "inadequate power" that must be used continuously.

(like my Diesel Toyota SR5 Pickp that cold only get 23-24mpg)

Ever take a long highway trip in a 2.3EFI Ranger? try cruising at
a "reasonable" speed on I-80 across iowa (Into a head wind)
you'll quickly discover that the 2.3 must be at "full chat" or
you may as well turn around and go home, a 2.9 OTOH will
actually get better mileage.
Because the 2.9 at 40% throttle uses less fuel than a 2.3 at 90%.


"Pumping losses" aren't a real factor except to some "ivory tower" types.
(if the shoe fits...)
I tend to worry less about examining theory to find a good way to do things than I do examining theory to Explain who something that works well does so.

I tend to be DEDUCTIVE rather than INDUCTIVE in my application of logic.

"pumping losses" are more a theoretical abstract than something that
should be a cause of concern.

It's one of nthose things you can't actually change so wasting time mentioning it
let alone discussing or worrying about it is .. well... a waste.

Because there are other theoretical issues involving engine operation that
can easily be demonstrated to be false.... usually because those abstract
ideas taken as "absolutes" ignore other equally valid ideas that ALL must
be included as part of a "Vector sum" for any situation you are trying to explain.


Like the ever popular discussion explaining that switching
someone's 3.0 (or 2.9) from 3.73 to 3.45 gears will invariably HURT their fuel mileage while switching to 4.10's will often help mileage.

Try explaining that three times to some stubborn absolutist and see
how quickly you need a 10day vacation from the forums to avoid
strangling someone.

MAbey it's the hotter intake tract of the turbo engine seems to vaporize fuel
a bit better or something... ?

Got me.. I just know that no only can a Saab 900 (single cam) turbo
get better mileage than a the non-turbo car it tends to get that
better mileage at a significantly higher speed.

And the main difference on the 16V saabs is NOT top end breathing,
the engine is set up for low and midrange torque if you actually try
to "spin" the twin cam engine the hydraulic lash adjusters pump up
and float and the engine essentially goes "Flat"

And while in FACTORY trim the 8Valve isn't all that revvy put a
bigger cam and start playing turbo size games and that engine
can happily be operated at shift points 1200rpm above the rev
limiter of the 16V engine.

I just accept that some synergistic combination of factors makes
for a "happy" combination and try not to subject to demonstrated
reality to an unnecissary ammount of analysis.

Do remember that an engine operating with a turbocharger can be tuned quite flexibly
and the turbo can be used to "Bend" where the engine seems "happy"

using a smallish turbine the turbo can spool up quickly and offer
bottom end grunt and a fatter midrange, but will probably fall off at upper rpm.

using a medium sized turbine and compressor you can really fatten the
middle and add a "bit" to either end, but this usually requires either restraint
of some method of "control" to prevent haing the boost peak at or near the engine's "natural" torque peak (DETONATION)

The third method is to use a fairly "open" turbine housing and a LARGE compressor.
This lets the engine be what it already was at low rpm and the turbo starts to come on in the upper midrange but what the turbo does most is simply prevents the torque from falling off past the engine's natural torque peak and extends the engine power range...
The sneaky part about setting up this way is that MOST of the boost is delivered after the engine's normal PEak volumetric efficiency (it's natural torque peak) so the worst of the potential for detonation is avoided.
BTW, this type of setup SHINES for a relatively high compression motor in which ytou have installed a "moderate" camshaft

So making a blanket statement that "X" engine isn't "appropriate" for turbocharging
isn't quite correct....

You just need to establish whatyou want it to do before you start than intelligently decide how to accomplish those goals.

Frankly it's probably easier to use ANY other engine than a 3.0, because a 3.0 wouldn't be my first choice either... (or my ninteeth choice for that matter...

IF OTOH I wanted to build a drag ranger a 3.0 would be the way to fly...

a 3.0 and a 125hp shot of nitrous and WHEN (not if) it blows up the junkyards are chockfull of 3.0 tauruses and Aerostars for another "bottle bomb" candidate.

words of a serious racer: "let the phucker blow, I brought four spares with me!"

AD
 

Kdawg532

New Member
Joined
Jan 11, 2008
Messages
762
Reaction score
1
Points
0
Location
Keymar,Maryland
Vehicle Year
2007
Make / Model
Ford
Engine Size
3.0 V6 God's gift to man
Transmission
Manual
words of a serious racer: "let the phucker blow, I brought four spares with me!"

AD
thats goin in my sig lol, but anyway what you have posted here is valuable information, i just want good acceleration power what size compressor should get screw the MPG's
 

Sponsored Ad


Sponsored Ad

Staff online

Members online

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Truck of The Month


Kirby N.
March Truck of The Month

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Follow TRS On Instagram

TRS Events

25th Anniversary Sponsors

Check Out The TRS Store


Sponsored Ad


Sponsored Ad

Sponsored Ad


Amazon Deals

Top