Maunal Guys w/ or w/o tunes - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 15 (permalink) Old 04-20-2009, 07:49 PM Thread Starter
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Maunal Guys w/ or w/o tunes

My truck has two things it does that I think is slightly odd, and I was wondering if all manuals do it, or if it's the tunes, or what.

1) With the 250 tune, in first gear, I run the RPM's up to about 2500 on a side road to help warm the engine on cold mornings. Sometimes, I push the gas above 2500, say around 2700, and no matter how much I let off the gas from that point, the RPM's keep going up, until I take my foot all the way off, resulting in a jolting deceleration. It's like the truck really wants to go above 2700. I have feathered the gas at that threshold RPM before, and it still climbs at a pretty fast pace. It does it in second too, but not near as bad.

2) The trucks are resistant to stall. If you idle in first gear, the truck will stay at 750 RPM's no matter what. I've tested it on hills without hitting the gas. I've tested it with a 3k trailer without hitting the gas. Now, I learned a trick the other day, if you hold the brakes to keep the RPM's between 500-600, the engine will fight back (trying to get back to 750 again), and with my 250 tune, it dumps smoke like a train in this phase. It works in all gears, but best in second gear, so you're going about 4 mph just flooding the road with smoke, like an insect repellent truck. If you let off the brakes and let it get back to 750, it acts fine when you hit the clutch. But if you just hit the clutch when you're below 750, the RPM's jump to over 1200 and waits a few seconds before coming down. I assume that's the engine's reaction to going from one second trying to boost speed and the next not having any resistance. I know the smoke is tune related, but the jump when the clutch is hit is what I'm wondering about.

'10 F350, CCLB, SRW, 4x4, 6 speed, 2.5" AutoSpring front leveling pucks, 37 x 13.50 x 18 Toyo's, 18 x 9 XD Diesel's, Road Armors front/rear

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post #2 of 15 (permalink) Old 04-20-2009, 09:06 PM
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Quote:
Originally Posted by Slick Willie View Post
.

2) The trucks are resistant to stall. If you idle in first gear, the truck will stay at 750 RPM's no matter what. I've tested it on hills without hitting the gas. I've tested it with a 3k trailer without hitting the gas. Now, I learned a trick the other day, if you hold the brakes to keep the RPM's between 500-600, the engine will fight back (trying to get back to 750 again), and with my 250 tune, it dumps smoke like a train in this phase. It works in all gears, but best in second gear, so you're going about 4 mph just flooding the road with smoke, like an insect repellent truck. If you let off the brakes and let it get back to 750, it acts fine when you hit the clutch. But if you just hit the clutch when you're below 750, the RPM's jump to over 1200 and waits a few seconds before coming down. I assume that's the engine's reaction to going from one second trying to boost speed and the next not having any resistance. I know the smoke is tune related, but the jump when the clutch is hit is what I'm wondering about.
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post #3 of 15 (permalink) Old 04-21-2009, 04:58 AM
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I noticed the same thing when I was running the RPMs up al of a sudden it would just take off and had to almost completely let off. I am running the 210 but from what I can remember it did it stock too.

Yes I haven't been able to stall the truck. A weird thing is that the clutch sounds so bad I can't help but push in the clutch.

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post #4 of 15 (permalink) Old 04-21-2009, 11:38 AM
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Quote:
Originally Posted by Slick Willie View Post
...It works in all gears, but best in second gear, so you're going about 4 mph just flooding the road with smoke, like an insect repellent truck....
insect repellant truck? i wanna see vids

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post #5 of 15 (permalink) Old 04-21-2009, 04:25 PM
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Yep my 6spd does the same thing. I only run the 210 as well because I can get that to slip my clutch with out trying that hard. If I want to floor it all the time I have to run the 150??

It is a very weird to drive this 6spd unlike any other diesel I have owned. I love it tuned though very easy to drive no lag etc!! Mine doesn't smoke a ton but again I only run up to the 210.

Yours sounds normal willie!
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post #6 of 15 (permalink) Old 04-21-2009, 04:54 PM
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Yep, mine does it too.

p.s. Thread Hi-jack:

Since SW has got some 6-speeder gathered up,
I can't pass up this opportunity ...

Can someone please tell me where the clutch master
cylinder is? It's not anywhere near my brake master
cylinder, or anywhere else I can see, for that matter.
A picture of the darn thing would be great

Rodney

08 F250 CC LWB 4x4 PSD, 6 SPD-Manual, 3.73 LS
2.5" Leveling Kit / 2" Superlift Add-a-Leaf
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post #7 of 15 (permalink) Old 04-21-2009, 06:23 PM Thread Starter
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Dang it Rod, you always gotta hi-jack. We were really getting somewhere!

Y'all don't have those trucks drive down your street and spray for mosquitos? They look like this:


I took a video this morning, but it wasn't that good, so I'll try again tonight.

'10 F350, CCLB, SRW, 4x4, 6 speed, 2.5" AutoSpring front leveling pucks, 37 x 13.50 x 18 Toyo's, 18 x 9 XD Diesel's, Road Armors front/rear

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post #8 of 15 (permalink) Old 04-21-2009, 07:45 PM
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Originally Posted by Slick Willie View Post
Dang it Rod, you always gotta hi-jack. We were really getting somewhere!

Y'all don't have those trucks drive down your street and spray for mosquitos? They look like this:


I took a video this morning, but it wasn't that good, so I'll try again tonight.
That looks kinda scary to me ... I don't think I'd want to be breathing
that stuff ... if the west nile doesn't get us, that spray surely will :0
( That guy on the bike on the right is probably coughing up blood
about now ...

Sorry about the high jack ... couldn't resist ... you know this clutch
master cylinder thing is driving me batty ... while looking for it some
more last night from underneath the truck, I noticed that I'm leaking
brake fluid from my brake master cylinder ... and I have a very small
seep of oil coming from the back of the engine above the oil pan And,
appearently I'm missing a clutch master cylinder ... but the good
thing is that I can't stall my engine

Rodney

08 F250 CC LWB 4x4 PSD, 6 SPD-Manual, 3.73 LS
2.5" Leveling Kit / 2" Superlift Add-a-Leaf
18" MT Classic II Wheels / 35" Toyo MT Tires
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post #9 of 15 (permalink) Old 04-21-2009, 08:25 PM
 
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my 7.3 does this and it's an auto, if i'm cruising in 3rd and i have the TC locked (manual lockup) and slow down to under ~15mph it goes below it's normal idle and bucks like crazy and pours smoke, i learned this by accident when i forgot to unlock the TC one day
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post #10 of 15 (permalink) Old 04-21-2009, 11:56 PM
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Mine does both of the things you described willie, but the only time ive noticed it is on the 250.

53 willlys dodge 2500 frame,24 valve cummins w/ p pump
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