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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 04-18-2009, 06:14 AM   #1
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Disco potato comparison, blue line is .64 A/R and red line is .86 A/R. 400rpm for 11ft.lbs?
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Old 04-18-2009, 06:46 AM   #2
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lol this should be good
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Old 04-18-2009, 07:23 AM   #3
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inb4 /buttsex/
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Old 04-18-2009, 11:25 AM   #4
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11 ft lbs is almost small enough for run-to-run variation, but that left half is significant.
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Old 04-18-2009, 11:55 AM   #5
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What engine? Is this on your 99 1.8?
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Old 04-18-2009, 01:24 PM   #6
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Big difference indeed. Do you have a comparison plot to the GT2560R that I run?
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Old 04-18-2009, 02:58 PM   #7
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What are EGT's doing?

That's interesting. I went with the larger turbine for EGT lowness. However, I still need to get back to the dyno because my AFR's are too rich out of boost, and spark table needs some work. I plan on doing this in May. There is still more work I can do to make my tune better, and I'm not sold on using a smaller turbine housing to lower spool exclusively. I think I can still reap the benefits of the larger hot-side if I work on a few other things.
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Old 04-18-2009, 03:21 PM   #8
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Quote:
Originally Posted by orion4096 View Post
What engine? Is this on your 99 1.8?
considering that's a dynojet, he's making similar #'s on a 9.5:1 motor with a pea-shooter 2554. lol

My car would make 292whp/282wtq on that dyno considering the 12% change from a local dynojet to the dynodynamics which I've shown in real data, and backed-up by keyboard jockeys.

However, my interest is piqued because my car makes more power than I wanted initially. I'm probably just going to leave it how it is.

Any chance we can get a look at this car's spark table?
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Old 04-18-2009, 03:44 PM   #9
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To quantify a bit, this was from an MR2. GT2860RS, they just swapped the hotsides to see what the difference would be.
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Old 04-18-2009, 06:46 PM   #10
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you mean "qualify." lulz
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Old 04-18-2009, 09:19 PM   #11
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Well I would say I am glad I got the .64 AR housing on my 2871. I'll give up a little torque for that much additional spool.

Did I mention even with my initial crap tune I was seeing 12 psi at ~3300 rpm?
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Old 04-18-2009, 11:04 PM   #12
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Quote:
Originally Posted by Savington View Post
To qualify a bit, this was from an MR2. GT2860RS, they just swapped the hotsides to see what the difference would be.
1ZZ-FE has variable intake cam timing. Don't know what that does to spool compared to a BP.
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Old 04-19-2009, 12:06 AM   #13
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Quote:
Originally Posted by hustler View Post
you mean "qualify." lulz
quan·ti·fy (kwŏn'tə-fī')
1. To determine or express the quantity of.
2. (Logic) To limit the variables of (a proposition) by prefixing an operator such as "all: or "some".

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Old 04-19-2009, 12:18 AM   #14
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Quote:
Originally Posted by SolarYellow510 View Post
1ZZ-FE has variable intake cam timing. Don't know what that does to spool compared to a BP.
I think you're thinking of the wrong generation. Probably the older 89-94 MR-2, not the 2000-05 MR-S. Anyways, later BPs have VVT as well; just two 1.8 4 banger convertible designs from different Jap companies at the same time.

I agree that the area to the left is educational and interesting, though I wonder what difference enriching it a bit would make on the red graph.

For a street DD (or autocross even), it looks like a .64 would be better putting around town. I think the low end benefits are better than the minor HP drop comparatively.
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Old 04-19-2009, 01:26 AM   #15
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Quote:
Originally Posted by Savington View Post
quan·ti·fy (kwŏn'tə-fī')
1. To determine or express the quantity of.
2. (Logic) To limit the variables of (a proposition) by prefixing an operator such as "all: or "some".

the graphs quantified it. now you're limiting the scope of applicability by saying it's an MR2 and not general for all cars. a quality of that dyno test is that it was done on a specific car. qualify.
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Old 04-19-2009, 01:36 AM   #16
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Quote:
Originally Posted by Savington View Post


Disco potato comparison, blue line is .64 A/R and red line is .86 A/R. 400rpm for 11ft.lbs?
Hey Andrew,
I have to ask... What does this MR2 bullshit have to do with the price of rice in China?

I'm going to agree with Hustler here. For open track, the tater is the better choice.
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