New turbo, new aftercooler, pump turned up equals FUN

[dds92780]

So i was chasing a boost leak for awhile on my truck. I had everything pressure tested and found out that the aftercooler had a bad leak on it. I ordered a new one from rex's. It was fun to install it because the flanges were to long on the top and had to be grinded down. In the meantime my turbo was going bad and had to get replaced.

So now i was looking at a new turbo and aftercooler. FYI i was onlyl getting 20 psi of boost and exhuast temps at 900. i knew something was wrong. GOTTA be quicker after that right? I wasn't done. I then went to the pump shop guy that tweaks with these bosch pumps and he messed with the aneroid and did a full turn of the screw. That is also on top of whatever turning of the screw was ever done to it before by the injection place that says they only put it on the high end of factory spec when they rebuilt it last year which is SLOW.

This truck FLIES now lol. I mean, i can't believe how much of a difference it makes doing this , I am not even really burning any more fuel than i used to either. Pyro temps are even lower than before too (prob why less fuel being used)

Here is a quick summary.

1995 Mack RD688S

E7 350 mechanical. 442 rears

On 11 percent biodiesel i would get 27 psi on a 80 degree day (pump not turned up)

now i get 33 pounds of boost (THIRTY THREE) (still got another full turn of the screw left to go to)

EDIT (just got bigger injectors) I now get 36 THIRTY SIX pounds of boost now!

So if i do the math, the mack spec sheet for my truck shows 350 hp and 1360 torque on the turbo anywhere from 24-27psi

That would mean i am running at least 410 hp now. it is a huge difference and totally makes the truck more fun to drive. I have already walked away from a few trucks that used to be neck and neck with me. I know it might be borderline of what the trans can handle so i never hammer it off the line or even 1st , and maybe toward end of 2nd gear but thats it. I literally keep up with trucks that are empty when im loaded lol. I love this truck

Thanks for listening

[Timmyb]

Nice work buddy. It's a good feeling when your truck is running sweet like that. Notice any chafe in fuel economy yet?

[gearhead204]

a sweet running 350 is tuff to beat .............. especially if your running a 400 cummins LOL!!!

[dds92780]

I havent really had a chance to check out fuel economy yet. The next day i worked i averaged 5.9 on some tough chicago highway runs. Then the next two days i averaged 4.8-4.9 on some tough hill runs where i would literally leave the pit, make a hard right and climb a hill up to 30 by a stoplight and then more hills 13 times. I think the fuel economy is better than it was before because with the hard driving i was doing last year i would get maybe 4.5 mpg. On the same hill against another RD loaded, i passed him up and he was looking at me like wtf and by the end of hill i had 2 full truck lengths on him lol. There was a vision 460 that used to kill me that i am just a tad quicker now than too. I am shocked that i am run with a 460 now . I just hope the engine is reliable and wont blow up. My pump guy says it should be fine. I have iron pistons and all that.

I mean some people go to a bigger turbo and injectors to make a 427 out of a stock 350 so what i did to achieve my power cant be too bad. I went from 27psi to 33. Keep all the questions and comments coming or if you have a turned up 350 i want to hear from you as well. Ill try to baby it more today and see what i can achieve. We will see if i can RESIST

[mack mhe9]

Nice work

[dds92780]

Well, so far it seems my fuel economy has dropped but not alot. maybe .25-.4mpg less. I am trying to just take the rpm up to 16 now to see what difference it makes. I might have the pump turned down .25 of a turn or .5 of a turn. I'm not sure yet. I am able to pass loaded RD 350s now its nothing tho lol

[rsb502]

Call Antrim diesel and get some good injectors and it'll go even harder.

[dds92780]

Call Antrim diesel and get some good injectors and it'll go even harder

I'm not sure the trans can really handle more than it does already. The turbo is already kinda maxed out. The turbo for this truck is designed to go from 24-32 psi. I get to 32-33 and it doesnt really go higher than that. The upside to the way its setup now is that i get 30 psi by 1600 rpm now, and even 23 at only 1250rpm. 427s are no problem. I even had a well known guy with a turned up 427-460 with 442 rears shaking his head and trying really hard to keep up up. We started at a stoplight and then went up a ramp, the lanes were merging, but he wasnt about to lose to a wimpy 350 lol. So he stays in the right turn lane only and after about 60ish, he finally starts getting ahead, i let off, his truck looked like a steam engine in between shifts trying to do that, im still laughing about it. 475 hp cats are similar to the way my truck pulls now. 425 cat i walk from. This truck is a blast now. I just take off in 1st gently to 14, then 2nd to 16 with a lil more throttle, then 3rd with a lil more to 16 then 4th gear and its cya LOL. Point is, i feel that i am being careful with the trans. SUPERDOG, if i got those injectors, wouldnt i be using even more fuel? The pistons are two piece with an aluminum skirt, so i got a pretty good setup here

[rsb502]

I have a 1450# trans, got Antrim injectors, Antrim turbo, 20% over pump, governor wide open.......I get 6.5-6.8mpg.

[dds92780]

I have a 1450# trans, got Antrim injectors, Antrim turbo, 20% over pump, governor wide open.......I get 6.5-6.8mpg.

How much boost are you getting?

[rsb502]

Run it around 15-20 during normal driving, try to keep it under 25 but if I need it it'll go to 38 pretty fast. It will pull 91700 up a long hill without slowing down at 25-26# of boost so I don't push it.

[Back In Black Pulling]

What Trans?

[dds92780]

So i got the injectors installed today I used to get 30 pounds of boost by 1500 on 1% bio on a 80 degree day. I have only driven it empty but i can already tell its way quicker. The needle just flies up on boost now. I easily get 33 pounds of boost empty now which i have never done before. I have seen 33 pounds of boost on a 60 degree day in the morning pulling a load around 1600-1700 rpm but thats it. I can't imagine how good its going to do when its loaded. That is all for now

[dds92780]

What Trans?

Eaton Fuller 9 spd

RTXF1409B

[storkmack]

Eaton Fuller 9 spd

RTXF1409B

As long as you use common sense, that trans should hold up just fine.

[rsb502]

Just drive it easy and let the truck do the work and youll probably get better fuel mileage because the engine will make so much more power it wont have to work as hard anymore. Im sure youll be amazed what those Antrim injectors will do to wake it up, just go easy on the Cat crowd you know they get hurt feelings when dogs make fun of em on hills (sure is fun though).

[dds92780]

Ok so two days now doing some 75000 gross runs putting on 360 miles then running back empty. I am shocked that the first day i only got 5.66mpg. So today i made sure that i was only going to go 55mph tops. build boost with quarter throttle at 25psi by 1100 or so, i would shift at 1500-1600. I am capable now of getting 30 pounds of boost by 1300. I would NEVER floor it even once all day long (took a ton of will power) The pyrometer never even went over 800. It was at 700 most of the day which i think is real good. I get home and excited to finally see what kind of mpg i got. 5.35. WTF??? Did i baby it TOO much? Doesnt the pyro being low indicate i had plenty of power and wasnt wasting fuel? Boost builds quick when i want it. Truck runs great. Im just not sure how to get the mpg to improve. I though with bigger injectors and turned up pump that i could get better mpg than stock because i wouldnt be wasting fuel trying to build up boost. I dont know anymore. I'm confused. Bigger turbo maybe???