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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 03-05-2007, 12:05 PM   #1
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Default New turbo installed, YIPPEEE!!!

I suppose most of you know at least a little about my ongoing build progress.
My original Frankenturbo just didnít work outÖ so I bought a used .80/.64 SR20det turbo and have had it in for about 4days now. It required a slight mod to my intercooler piping, but otherwise fits just like the old one. Hereís how itís working:

1. No more boost overshoot. Iíve got my ebay MBC set at 10psiÖ and it holds a steady 10psi from about 3300rpmís to near redline where it drops to just about 9.5psi. Formerly I had as much as a 4psi overshoot. Iím using the same wastegate actuator.

2. Since the bigger compressor flows more air per psi, I know Iím running leaner. I donít have that constant stink of raw fuel anymore. It still smells a little on startup, but even running catless, once itís warm, no fuel smell. I think since Iím using less boost, but flowing more air, Iím not running as rich anymore on the top-end.

3. Itís loudÖ much louder than the other turbo, definitely moving more air. The car sounds like itís a lot noisier in general. Lots of new creaks and rattles under hard acceleration.

4. Power delivery is virtually unchanged, except thereís A LOT MORE OF IT! I mean thereís more power now at 10psi than I was seeing at 16psi with the old setup. I donít event think Iíve sacrificed any spool time. Iím still starting to spool under 2000prms and hitting full boost by 3500rpms.

5. No more clutch slippage. I was having clutch slip issues on my old setup at around 180ftlbs on the 240ftlb rated clutch. But I was having that issue at a relatively low 4000rpmís at around 16psi. Now that Iíve lowered the boost, Iím pretty sure the torque curve has moved to the right, making peak torque later in the RPM range and for some reason, the clutch likes that better.

Iím extremely pleased with the current setup. I broke it loose in 2nd this morning going around some trafficÖ never got it loose before at 40mphÖ scared the **** out of me. I need to get an LC-1 here in the next paycheck or two to see where I stand on the fuel. Iím gonna leave it at 10psi for now, but I think with some timing adjustment, 12psi is doable on the 310ís, and then Iíll really be in need of a new dif.

-Sam
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Old 03-05-2007, 12:10 PM   #2
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get that junx on the dyno!


and post your freaking first plot!
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Old 03-05-2007, 12:35 PM   #3
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That's great news!
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Old 03-05-2007, 01:18 PM   #4
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Nice, the turbo works fine then?
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Old 03-05-2007, 04:32 PM   #5
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Better than fine. It works so well (and is so clearly superior in every way) that I'm gonna steer people away from the .48/.49 DSM turbos. It's what I should've done in the first place. Wideband is in my near future... after I've done what I can with that, it's dyno time.
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Old 03-05-2007, 04:53 PM   #6
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Great!!!
Same turbo for me but with a hks manifold on a 1.8 NB.

If yours spools at 2000 rpm, I wonder at what rpm will spool on my Nb 1.8...
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Old 03-05-2007, 05:23 PM   #7
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hey spamnavy , now You have the same turbo im running lol, only diffrence is you have your ic done and over with......I need like 400 bucks and a week off work to get this crap done :( , I still need to get my dumpipe made and IC Piping done, but work keeps taking my time ahhh, maybe I should rent a welder and pipe bender to do this ****
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Old 03-05-2007, 05:45 PM   #8
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Good deal man. You might want to twist your mbc down a bit until you get that wb installed. 6 psi is still fun, right
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Old 03-05-2007, 05:52 PM   #9
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stock wastgate actuator on the sr turbo is set at 7psi, cant go any lower than that
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Old 03-05-2007, 05:59 PM   #10
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well whatever dude. 7 psi is safer than 10 psi when you're tunning by guestimation.
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Old 03-05-2007, 06:08 PM   #11
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yes that is correct . nothing to fight over
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Old 03-05-2007, 06:58 PM   #12
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Thats my turbo also. I too am happy at 7 psi. I don't plan to get on the dyno until the summer, so I am very interested in your results.

If the Spec holds up I may try the "stage 2 plus" for myself.
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Old 03-05-2007, 08:15 PM   #13
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Quote:
Originally Posted by spamnavy View Post
Better than fine. It works so well (and is so clearly superior in every way) that I'm gonna steer people away from the .48/.49 DSM turbos. It's what I should've done in the first place. Wideband is in my near future... after I've done what I can with that, it's dyno time.
Good. I was almost positive it was in good condition, glad to see it works great!

Dyno that sucker
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Old 03-05-2007, 11:12 PM   #14
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I bypassed the MBC and will run on wastegate alone for the time being... maybe. I lit'em up in 2nd a few times today just getting on it hard.

I'm working the WB magic on the wife... she's gonna hate the idea of me haulin *** around with her laptop on the passenger floor.
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Old 03-05-2007, 11:24 PM   #15
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Quote:
Originally Posted by spamnavy View Post
I bypassed the MBC and will run on wastegate alone for the time being... maybe. I lit'em up in 2nd a few times today just getting on it hard.

I'm working the WB magic on the wife... she's gonna hate the idea of me haulin *** around with her laptop on the passenger floor.

damn ....Im so behind you in my project.....damn it if it was'nt for this full time job, time, a welder,and mandrel bender I'd have this crapola done, I have a mbc between the wastgate and turbo outlet set at 7 psi, maybe I'll move it up after I get the damn bitch turbo'd

Its taking me soo long itss depressing me
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Old 03-05-2007, 11:56 PM   #16
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Just focus on one thing at a time man. Once the turbo is in, then start getting the boost set to what you want it at.
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Old 03-05-2007, 11:56 PM   #17
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In reply to Rican's post:

Damn it, if it weren't for the constraints of time and money, I'd be rich and bored.
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Old 03-06-2007, 12:40 AM   #18
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That's one way to solve boost control problems.

Good to hear lots of positives from the switch. I haven't followed this SR20DET turbo...is it a T25?
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Old 03-06-2007, 01:25 AM   #19
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Very nice Sam. Your also ahead of me. I would be done by now but I blew my 1.6 so I just swaped in 1.8 which set me back alot since I had to buy a new manifold and downpipe. But I'm shure I'll be much better off with my Begi manifold, FM downpipe and my SR T25.
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Old 03-06-2007, 12:31 PM   #20
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Yes, the SR20DET turbo is a T25.

Sounds bad-*** to me. The new turbo is better in every way!
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