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Author Topic: Heres my 77 Datsun blowthrough turbo  (Read 545 times)

MantisX

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Heres my 77 Datsun blowthrough turbo
« on: April 14, 2017, 03:33:37 PM »

Heres my contribution in trying to get some traffic back to this place. I probably would have never given a shit about a turbo if not for HMT and later RHMT. The engine is a stock L20b 2 liter that I upgraded with ARP studs. The turbo is a garrett gt2554r (for now) Yamaha R1 carbs and custom made by me airbox and whatnot. Greddy blow off valve and a shitload of jets.





Here it is when I first got it.



Put a weber carb on it and got bored quick


Yanked that bullshit out and redid the engine bay


Got my brother to shoot an ok paintjob on it.



Working on refinishing these wheels


Then I cobbled together some turbo stuff and put it on the truck




Manifold I made myself. Pressure tested to 32lbs and it held


Got it to start
https://www.youtube.com/watch?v=RwzGtLyPCyk

After some carb jetting, pressurizing the carbs, beer and swearing I finally made a pull on 10lbs as I knew this would turn me out. Not much timing in it here as I still dont know wtf im doing. A dyno trip is scheduled.
https://www.youtube.com/watch?v=VmUtneIr_Jo

Next is to work on part throttle and turn the boost up until it says uncle. I have a spare block that Ill be completely building and ill be stepping up to a bigger turbo. Its fun as shit as boost is instant. On my integra I have to wait a second or 2 before im going.
« Last Edit: April 14, 2017, 03:37:57 PM by MantisX »
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ratcityrex

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Re: Heres my 77 Datsun blowthrough turbo
« Reply #1 on: April 14, 2017, 05:17:27 PM »

Hell yeah dude!! Looks fucking mint!!
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New setup is old bottom end with a hype r head with gsr cams. built lsv with hx35 @ 26psi on pump gas
LEED tuned! 434hp/329tq http://www.youtube.com/watch?v=_pbDXZxZdZs
http://www.realhomemadeturbo.com/forum/index.php/topic,16195.0.html

Old Setup B18a1 296hp/289tq LEED Tuned 20psi on pump! http://www.youtube.com/watch?v=2Yj-Z90j4W4 
http://www.realhomemadeturbo.com/forum/index.php/topic,205.msg2437.html#msg2437

highroller54

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Re: Heres my 77 Datsun blowthrough turbo
« Reply #2 on: April 15, 2017, 07:26:16 AM »

Fuck yes knee grow.
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Xenocron is a piece of shit.

I solve my problems like an adult, at the strip club drinking on a work night.

Eggylshatch

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Re: Heres my 77 Datsun blowthrough turbo
« Reply #3 on: April 19, 2017, 11:03:41 AM »

MORE.
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crxvtec91

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Re: Heres my 77 Datsun blowthrough turbo
« Reply #4 on: April 20, 2017, 11:57:04 AM »

Damn this is badass! I always wanted one of those!
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My build thread; http://www.realhomemadeturbo.com/forum/index.php?topic=2444.0


I like my girls like I like my cars, rich and retarded.

MantisX

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Re: Heres my 77 Datsun blowthrough turbo
« Reply #5 on: April 20, 2017, 02:45:40 PM »

I made a detonation detector using one of those hearing aid boxes, some extra wire and an alligator clip using this writeup: http://www.autospeed.com/cms/article.html?&title=DIY-Detonation-Detection-Part-2&A=0353 Hopefully friday or saturday I can get out and do some pulls and come up on the timing a bit. I still intend to get to the dyno but I figure I can use this to make sure part throttle and coming up on and into boost is safe as is. AFRs are around 11.5-11.8.

Also started polishing on the wheel faces.
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Ntrain2k

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Re: Heres my 77 Datsun blowthrough turbo
« Reply #6 on: April 20, 2017, 04:00:02 PM »

fap fap
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MantisX

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Re: Heres my 77 Datsun blowthrough turbo
« Reply #7 on: April 28, 2017, 08:10:02 AM »

Finished polishing these up and got some tires mounted. They are shitloads lighter than the ones I took off.

I also tested out the det detector and it works pretty damn well. You can clearly tell when the timing is where the engine is gonna take a shit. I backed off 2 degrees from that and no detonation.
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rawr

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Re: Heres my 77 Datsun blowthrough turbo
« Reply #8 on: April 29, 2017, 12:19:59 AM »

sick af fam
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MantisX

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Re: Heres my 77 Datsun blowthrough turbo
« Reply #9 on: May 02, 2017, 02:10:00 PM »

Still not fucking rowdy enough! Needs more timing and/or turbo.
https://www.youtube.com/watch?v=2QiKaZXD368

I think im applying too much honda knowledge to this old datsun engine. N/A, these are all in at 35 degrees @ 3000rpm. Im pulling it back to 27 degrees at 8-10lbs on this little turbo. Im thinking itll be happer in the 29 possibly 30 range at these small boost levels and small turbo. Then I can pull more timing once im beyond 10lbs. Either way im not mad because it was an absolute turd without it.
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Eggylshatch

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Re: Heres my 77 Datsun blowthrough turbo
« Reply #10 on: May 05, 2017, 12:52:03 PM »

Hell yeah. More vids!
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MantisX

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Re: Heres my 77 Datsun blowthrough turbo
« Reply #11 on: June 25, 2017, 02:30:31 PM »



4th gear. Almost as quick as I'd want to go in a 620. Another 2-5lbs should do it. Currently at 10lbs with more timing added. I heard this turbo becomes a heat pump after 15lbs so I'll stop there.
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