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Post by wayne83 on Nov 24, 2011 12:54:23 GMT -5
I just got my turbo all installed(besides the exhaust right now, just a hoodstack for now). I have no wastegate on it and its a garrett t2 turbo a/r.48. driving down the road at 60 it holds right around 3psi for boost, but when you get into all the way it builds up to 14psi. The problem im having is the truck has ABSOULUTLY no extra power with the turbo. I know its not a race truck, but i did race at the dragstrip for fun and it ran a best of 22.129. After turbo installed me and friend marked out exactly 1/4 mile and it runs basicly the same time as it did with no turbo. It feels like it has more power accelerating, but apparently it does not because also when racing it without the turbo i raced my old truck i had(a 94 f250 2wd with a 4.9) and both stayed neck and neck for the 1/8th mile then the f250 pulls away, and after the turbo was installed its the EXACT same way. There is no lag according to my boost gauge, she builds boost quick and fast, but what would be my issue as to why it has no more extra power? The only thing it did was take away almost all the black smoke when accelerating, but it still doesnt even hold itself any better going down the highway at 70(and i have the 5spd in it 2) Like i said, i know this is no race truck and i probably shouldnt be running 14psi, but adding the turbo has added NO extra power at all. My air filter is just a cheap cone filter, my air charge pipe is 2"ID pipe because thats all we had when doing this, was going to use 2.5" for it, but didnt have any, but would anyone think that would be the issue? My oil feed is off my oil sending unit, return line is 5/8 back into oil pan. So any ideas as to why it gained no power would be appreciated. Thanks, wayne
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Post by gradyc on Nov 24, 2011 14:26:25 GMT -5
It probably needs the pump modified to take advantage of the turbo. The diaphragm on the top of the turbo is somehow used to give it more fuel under boost to take advantage of the extra air. On these engines they call the diaphragm assembly an altitude compensator. I have heard of people modifying the pump for turbo use and it has something to do with this assembly but I haven't checked into how to do it yet.
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Post by wayne83 on Nov 25, 2011 0:59:03 GMT -5
I do remember reading on here about how someone wanted to try and make the altitude compensator help with fuel. But I also remeber reading on here I believe it was jaybees truck he said on her3e he had it going 94mph and that it would hold either 75 or 85 up hills.I'm not sure if he did that to his truck or not though because I can't get ahold of him. Mine driving down the road at 65 or 70 even with the turbo still drops down to 55 up a hill. Once I re raced my old truck and found I have no more exctra power I cut the fuel lock tab off and turned the fuel up and that still didn't give me any power just .made it smoke black again and build up to 16psi of boost. I'm compleltly confused on how I supposedly have boost but yet I have no power gains.
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Post by tempforce on Nov 25, 2011 23:07:20 GMT -5
not sure if it was jaybee but he lost the engine while loaded and at 40+ lbs boost.
i would just be glad the smoke is gone. and enjoy the turbo sound.
who cares of you gain more than 10 hp. the engine will out last all of us. if you don't try to make it into a road burner.
you should notice a bit more pulling power on hills.
i wouldn't turn up the fuel to much, as more power is extracted, you loose miles of use..
personally i wouldn't trade the power for the loss of miles...
cc
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Post by wayne83 on Nov 26, 2011 1:57:56 GMT -5
Im not looking it a road burner here that is for sure, definitely would pick a different vehicle for that haha. But as that said, if i actually gained 10hp with this turbo i would be blown away. If i even gained 1hp im going to be shocked. Going up hills it is absolutely no different than it was without the turbo,and i mean NO different, which is what makes me the most disgruntled with it, because it does nothing i was hoping it would. I can be cruising along a nice flat part of road at 70 with no issues holding it there but then even the slightest bit of a hill it will loose speed no matter how much more you give it, and this road is the same road i drive down multiply times a week and it drops the same amount of speed as it did with no turbo. I was planning on not touching the fuel screw as it still had its little lock tab on it, but when i got angry with no results, thats when i turned it up, and when that didnt do anything i did turn it right back down. I guess next week or so we will see whether or not i did gain any hp with the turbo, as the place i dynoed it at is dying to have me bring it back in and re-dyno it just because its the lowest hp vehicle they have ever done before so they get a big kick out of it.
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Post by mhuggler on Nov 28, 2011 7:38:51 GMT -5
It sounds to me that you're turbo is way too small especially on the turbine side. Do you have a map for that turbo? You want a turbo that flows about 10 lbs./min. of air for these engines. The fact that you have little to no lag means that you are most likely past the choke line of that turbo. Keep in mind that boost is not want we want as boost is nothing more than resistance to flow. What you want is a big, lazy turbo that flows lots of air with a big external wastegate to keep the boost down to like 5psi.
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Post by wayne83 on Nov 28, 2011 15:21:47 GMT -5
I do not have a flow chart for this turbo. The only thing I could find on net was that it was used on a john deere tractor. The numbers on the turbo are re53173. 466874-5004. Jf21619w. Housing says garrett t2 .48 a/r. If anyone can find out some info on this turbo that would be helpfull. Ill be very angry with myself if its to small as I made up the manifold and now it will be junk to me along with the turbo.
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Post by wn5073 on Nov 29, 2011 0:22:27 GMT -5
Check egt's. If they're low, bump the fuel screw out a bit. A little heat will help make boost.
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Post by mhuggler on Nov 29, 2011 8:33:37 GMT -5
Check egt's. If they're low, bump the fuel screw out a bit. A little heat will help make boost. He already has too much boost. He needs more airflow with less boost. |
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Post by wayne83 on Nov 29, 2011 15:26:19 GMT -5
Yea boost isnt my problem, and i already did try turning up the fuel, with no success, so i turned it back on. Ive called quite a few places about my problem and no one seems to know really besides the possibilty of it being to small. I found a turbo off a 2.5 mercedes diesel rater at 93hp and 122lbs tq. Would you think that would be a decent turbo to try and use? I cant find flow charts for that turbo either, but it is a garrett as well and has the t25 flange(which apparently is the same as the t2) so then all i would be doing is just swapping the turbo and can use my manifold i have still. i know grady said you want to try and use a turbo off a similar size motor and he is using one of a 2.5 chrysler product i believe it was? So my thought would be this is a diesel turbo off a 2.5 so it should work good on this possibly?
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Post by wayne83 on Nov 29, 2011 15:28:43 GMT -5
opps my mistake just went and re read previous post and grady is using one of a volvo 240
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Post by tempforce on Nov 30, 2011 0:01:00 GMT -5
the 2.5 mercedes turbo, if it's off a diesel, i would go for it.
if it's for a gas rig. it won't flow enough air. as most gas rigs turn twice the r.p.m.'s as a diesel for the same road speed.
of course our little engines are wound pretty tight at highway speeds..
the turbo i have waiting, is off a 2.3 mitsubishi diesel... hope to install it sometime next year..
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Post by mhuggler on Nov 30, 2011 12:17:53 GMT -5
I do not have a flow chart for this turbo. The only thing I could find on net was that it was used on a john deere tractor. The numbers on the turbo are re53173. 466874-5004. Jf21619w. Housing says garrett t2 .48 a/r. If anyone can find out some info on this turbo that would be helpfull. Ill be very angry with myself if its to small as I made up the manifold and now it will be junk to me along with the turbo. There are many different arrangements for each turbo garrett makes. If you wanted to, you could get a tech. support number from their website(turbobygarrett.com) and see if they offer a turbine housing larger than .48 a/r for that particular turbo. You have too much drive pressure on that turbo. If the exhaust can't get out, fresh air can't come in. |
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