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Old 04-08-2019, 02:47 PM   #1 (permalink)
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Big power guys transmission issues

Hello all, Daivd here Im the owner of a 2006 si coupe. I purchased it last year all stock to have for a daily driver. That was short lived, I ended up doing a build on it as I do with everything else. Here is a general list of whats done to the car forgive me if I may forget something:

kraftwerks supercharger
brian crower firced induction cams, dual valve springs and titanium retainers (apr studs)
kraftwerks large bore throttle (80mm I think)
long tube header
misc parts
aem progressive methanol system

When I was building the car I was hoping to make close to 350-360 whp, I took the car upon completion to Zen Motorsports in Suwanee, GA to be tune. I told them to essentially give it everything lol. Little information on Zen Motors dyno is a mustang dyno. The guys there are really cool and have a pretty sweet shop.

Any how all said and done the car mad 459 whp without meth, the tuner said he was a little weary to do anymore as he was worried about the stock gear box and shocking the gears.

the car has been tuned for about 8 months now and the clutch is toast, I'm having clutch specialties in Atlanta, Ga build a clutch for the car. My concern is the stock gear box and I've tried doing some google searches and looked at different gear sets but they seem very expensive and aren't rated for serious power. I am tempted to throw a clutch in it and have it re-tuned with the meth.

Has anyone else had these issues? I'm a mechanic and do all my own work and build several cars but this one is new to me. I have seen some people making good power say the stock trans is good and others say the exact opposite.

looking for some advised on what to do and how to do it right, but I'd like to keep it somewhat price friendly.

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Old 04-08-2019, 03:03 PM   #2 (permalink)
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Here are some pictures for you guys.

Attached Thumbnails
Big power guys transmission issues-img_0013.jpg   Big power guys transmission issues-img_0020.jpg   Big power guys transmission issues-img_0141.jpg   Big power guys transmission issues-img_2124-1-.jpg   Big power guys transmission issues-img_0142.jpg  

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Old 04-08-2019, 05:03 PM   #3 (permalink)
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Not much help here, but I'm subbing to see what you find out. I'm about to be rebuilding my trans, and I'm not that far from you (AL), so if you find a good shop I'd like to get some info.
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Old 04-08-2019, 05:16 PM   #4 (permalink)
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0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm
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some will say it depends how you drive, and others will say it's only a matter of time. might as well just drive it until it breaks, and be ready to beef it up. some people have been lucky...but more than enough of us have toasted the trans on less power.
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Old 04-09-2019, 02:12 PM   #5 (permalink)
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I understand that, I'd would just rather build the trans while I have it out to do the clutch if it really needs it. I don't really drive it to hard, usually I drive like a grandma lol.
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Old 04-09-2019, 03:49 PM   #6 (permalink)
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0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm0720Steve shifts at 12500 rpm
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thats true. getting in there is a pain in the ass. if you got the cash, beef it up while it's out/open.
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Old 04-09-2019, 10:00 PM   #7 (permalink)
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Mine has been fine so far. Made around 450 for about a year. Clutch is fine as well but I don't launch the car or do burnouts. I daily the car and drive normal. During a race I granny shift 2nd and sometimes 3rd but always dump 4th and 5th. I change the trans fluid once a year to keep a eye out for metal but it's been fine. I would say just drive the car and you'll know when SHIFTS are hitting the fan ahahaha get it
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Old 04-16-2019, 07:21 PM   #8 (permalink)
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jeffantman just put it into 1st gear on 8thcivic
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I had an 08 SI and it had about 200 hp. As an engineer, I can tell you the stresses on EVERY piece of your drivetrain are proportional to power. You are applying more than 2X stresses compared to stock. That will really test the limits of the design. Something maybe lots of things are gonna break sooner than they should. In your favor, the stock SI seemed shockingly durable for a high performance car. Your car sounds like enormous fun! Just be prepared that in a difficult situation something might break and it could be a safety issue. Not that you couldn’t just fix it.
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