1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

12A Turbo (High Compressor Rotors)

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Old 12-10-05, 12:04 AM
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Question 12A Turbo (High Compressor Rotors)

I was wondering since everyone say you need low compression rotors for turbo would a 12A N/A using high compression rotors with a low boots turbo work?
Old 12-10-05, 12:14 AM
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how high of compession you talkin about? stock is 9.4:1 and i'm boosting 16psi all the time. aahahhahahahhaha I LOVE IT!
Old 12-10-05, 12:28 AM
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lmao 12A is undestructable!























Disclaimer: 12A may only be undestructable when well taken care of otherwise your screwed.
Old 12-10-05, 02:19 AM
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aahahahahha! niiiice

they are pretty fuggin tough tho that's for sure
Old 12-10-05, 12:28 PM
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FB II, did you just adjust your timming for 16 Psi and leave it there? I am thinking about building up my 1974 4 port 13b with a good size streetport and then running about 10 psi.
Old 12-10-05, 12:36 PM
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So, FB II, If I rebuild my 12A using stock compression and turbo it runing around 8-10psi max on turbo would that be fine?
Old 12-10-05, 12:47 PM
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Talking

yea man you will be fine, me and FBII have been rockin out, im running about 8-10lbs right now, he'll rock out much higher than that and leave me in the dust
Old 12-10-05, 01:24 PM
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i am doing the same thing, as you, using hight comp rotors, but make sure you read this first,

https://www.rx7club.com/showthread.p...igh+output+12a

some of the things in there are unneccisary with the boost you are running, but tuning is everything, so maybe convet to efi, unless you have a good tunable carb system and a rising rate regulator.

Paul
Old 12-10-05, 02:17 PM
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damn......

hey FB II... I THINK YOU STARTED A 12AT REVOLUTION!!

Old 12-10-05, 03:45 PM
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LOL heck yes!!!! i'm just spreading the reality of it all. people aren't so scared to tackle such a project anymore... which is great. people don't have to be stuck with 130rwhp anymore and no need to bust open the motor to get 200rwhp

turbo is the win

michael: yes you lock the timing so it never advances past a certain degree. anything over 15 psi i leave it at 10 degrees. under that around 12 or so. each engine you can mess with it a little. here we use 93 pump gas so it helps i've hit over 20 psi with no problems at 10 degrees. i've seen people run 30 psi at that. and street drivability is still better than stock.
Old 12-10-05, 03:51 PM
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oh and just to get people motivated more... last night 84gsNC and I both whooped up on:

-b16 BPU delsol - pulled atleast 4 buslengths
-BPU accord - lost him in the rear view somewhere
-BPU rx8 - kinda made me sad that it was like racing the accord
-very nice new GTI with mods.. his turbo was insaaanely loud- left him in the dust and he crept back up giving me the big thumbs up
-the g35's and s2000's we saw wouldn't have any aahahahhahaha

-bpu = basic performance upgrades (in case anyone doesn't know)

going back out tonite, will try to get some video footage of the massacre
Old 12-10-05, 07:36 PM
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This has already got me motivated enough, i tore my engine apart and started porting, also ordered the parts i need to rebuild my turbo. Should be fun in my 1974 repu with the 4.625 gears
Old 12-10-05, 08:16 PM
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i want to turbo my 12a but i dont know how you do it. stupid i know. i have a holley 465 i think. boost prep?turbo to use? is there any writeups? love your set-up fb II.
Old 12-10-05, 11:32 PM
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get it blown then you got boost spooling at idle no lag, the `12at idea should have been a factory must for all 12a cars! i also got told by a mech man to use rx5 stationary gears in the 12a???
Old 12-11-05, 02:17 AM
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well tonite we went out and had some fun.. i stayed on the *** of a c5 corvette. he never pulled from me. he was such an ******* tho, wouldn't line up with me dead on oh well.
Old 12-11-05, 02:35 AM
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You should have pulled along side and left him in the dust LOL
Old 12-11-05, 03:31 AM
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once i get good tires in the rear, i'm callin him out
Old 12-11-05, 03:42 AM
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I'm thinking we're gonna be adding a C5 skull and crossbones soon LOL
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