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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 10-10-2009, 04:15 AM   #41
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I think we need to spend more time looking at builds like what Andy, CCC, and Eliminator are doing. They are showing us that using small turbos is a mistake.
They aren't showing us anything, Ben. 16psi at 4700rpm is ******* pathetic. Hustler is making the same power at the same boost, only his turbo spools over a thousand RPM sooner.
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Old 10-10-2009, 10:48 AM   #42
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They aren't showing us anything, Ben. 16psi at 4700rpm is ******* pathetic. Hustler is making the same power at the same boost, only his turbo spools over a thousand RPM sooner.
It's obvious you didn't read any of the posts I wrote, so let me make this very simple.

This is a comparison between your car and H-F's. They are roughly similar in execution, but you went with a 2871 and he went with an "oversized and laggy" 3076.

Note he makes more power at every RPM.


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Who gives a **** if it take a little longer to make equal MAP on a gauge, if you're making more power per PSI.

Incidentally, Andy said he got 16 psi at 4300 rpm. On his stock computer, with a weaksause built engine. 330 cc injectors @ 120 psi and a bipes. Andy didn't have a nice NB head. His block was a 95 with forged pistons and stock GTX (or GTR dont remember) rods. No fancy machine work. Tell me that Jeff's motor wouldn't spin that turbo up 500 rpm sooner, if not more.
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Old 10-10-2009, 03:14 PM   #43
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Ben, have you ever actually driven a big turboed car on a track? My 2871R makes more power and torque than my 2554R did from 3000rpm up - it doesn't make the 2871R any less difficult to drive. The 2554R feels like an OEM turbo, plant your foot and go IMMEDIATELY, where the 2871R takes that little bit of time - even if it's only a second or so - to wind up and kick you in the rump. You can whine and brag about how your HUGE turbos make more power everywhere, but all I see from HF's chart is a torque curve that slopes up in a big way, which makes for a car that is peaky and nasty to drive - end of story. If we both snap the throttle open on a dyno, and you make more torque at an earlier RPM, that's great - but do you honestly believe that if we jump on the highway at 4000rpm and snap the throttles open at the same time, that 3076 is going to wind up and pull sooner than a 2860 or a 2871?

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Old 10-10-2009, 07:01 PM   #44
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Yeah ben if you look at the chart cuting it off at 4k rpm savs turbo makes more torque considerably more torque. Sure after 5k he is a sitting duck but outside of a drag strip the difference in torque makes the smaller turbo faster and just all around more effecient, for raod and general performance driving where you cant just go from one redline to the next progressivly up the gears. At 3k rpm the dif is like 40 lb/ft that is nothing to sneeze at.
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Old 10-11-2009, 11:00 AM   #45
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.....do you honestly believe that if we jump on the highway at 4000rpm and snap the throttles open at the same time, that 3076 is going to wind up and pull sooner than a 2860 or a 2871?
At 4000rpm I would believe it.
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Old 10-11-2009, 12:22 PM   #46
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Originally Posted by Savington View Post
Ben, have you ever actually driven a big turboed car on a track? My 2871R makes more power and torque than my 2554R did from 3000rpm up - it doesn't make the 2871R any less difficult to drive. The 2554R feels like an OEM turbo, plant your foot and go IMMEDIATELY, where the 2871R takes that little bit of time - even if it's only a second or so - to wind up and kick you in the rump. You can whine and brag about how your HUGE turbos make more power everywhere, but all I see from HF's chart is a torque curve that slopes up in a big way, which makes for a car that is peaky and nasty to drive - end of story. If we both snap the throttle open on a dyno, and you make more torque at an earlier RPM, that's great - but do you honestly believe that if we jump on the highway at 4000rpm and snap the throttles open at the same time, that 3076 is going to wind up and pull sooner than a 2860 or a 2871?
You know when I compared those charts, I looked at HP and not torque. There must be something funny about one of those charts, I'm assuming HF's because he has more HP than you at 3k... but then he has less torque.

No, I think the 3076 is too big. But you didn't give any attention to Andy Floyd's 3271, which is a much better illustration. Remember Andy had a ghetto engine and no management.

I think the most interesting data is in Andy Floyd's dyno and in the FM 2560 vs 3071 plot. Giving up avg 10 ftlb below 4k rpm to gain avg 75 ftlb everywhere over 4k seems like a good idea to me.

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Andy Floyd's 3271


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Old 10-19-2009, 08:44 PM   #47
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Default 2871r on my car this past weekend.

OK, so i got the 2871R
Spools about the same.

I have a very quick tune going though. basically nothing was changed but the af to make it safe for this past weekend's event.
I am def down on power and tq.

I finished 2nd Saturday so I get to go to the nationals.

Anyway, tonight I will post the dyno with the 1 hour tune on it.

i think I have some solid room for improvement with timing and maybe some more boost. I def think we can get it to spool a bit faster..

Once that happens I will post that too
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