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I can't win

 
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Old 08-18-2011, 01:47 AM
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I can't win

Is anyone on here an engine builder? I have so many questions and need so much input it's amazing. There is only so much I can teach myself about this stuff...

Anyways I'm going to buy a j35a1 (or whatever is similar) block. I need to ship it out to be sleeved and stuff. Now the question is: since nearly custom rods, crank, and pistons cost the same is it worth it to bore & stroke it? My end goal is turbo so I know I need a lower c/r but will some extra displacement help?

Darton sleeves, J37 Honda crank, crower forged rods, JE forged pistons, j32a2 complete heads, and j37 intake manifold with a custom fuel system. 96mm stroke x 94mm bore puts me at 4l. Worth it with supporting systems?

Fuel and cooling accounted for on this as well. Can't account for the poor weight distribution of the 5th gen though. Traction will always be an issue.

I really need my own thread for my v6 stuff. I feel dumb putting it here but it's the closest I come to a prelude question... Sorry everyone.
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Old 08-18-2011, 07:17 AM
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Re: I can't win

you don't NEED a lower C/R for turbo. i'm actually thinking about bumping UP the C/R on my STi with my next block, to help with off-boost torque.




"worth it" is a completely subjective term. worth it to me might not be worth it to you, na'mean??

there's no one on j32a.com that's done an engine build like this before?!
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Originally Posted by Brash View Post
But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 08-18-2011, 09:28 AM
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Re: I can't win

I know you don't need it but I still want to run pump gas. I just know it would be easier.

I wouldn't trust anyone on j32a as far as I could throw them. It's a forum for bragging more than anything.
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Old 08-18-2011, 11:08 AM
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Re: I can't win

Wait are you saying a car that came turbo relates to a car that didnt.

No way man. The sti comes with 8.2:1. If you bumped it up to 9:1 you may see some gains. If you start above 9.5:1 and you try to raise it even higher you will have problems. Its the same reason a stock lude at 10:1 is not a great turbo ready set up.

You need to remember the turbo creates its own compression when it makes boost. This is magnified by the piston's compression. This is the main reason that most turbo cars come with less than 8.5:1.

If you want more off turbo power, you need to look into head work, or maybe a less restrictive intercooler. Maybe a better exhaust manifold. Something that decreases spool time.
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Old 08-18-2011, 11:35 AM
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Re: I can't win

I would love to have head work as an option but I don't. There is no way I can fund custom 1 off cams. Springs will be changed but I can't find anything for valves/seats yet.

I'll do some more searching today since I'm bored at work.
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Old 08-18-2011, 11:54 AM
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Re: I can't win

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Originally Posted by Noober View Post
Wait are you saying a car that came turbo relates to a car that didnt.

No way man. The sti comes with 8.2:1. If you bumped it up to 9:1 you may see some gains. If you start above 9.5:1 and you try to raise it even higher you will have problems. Its the same reason a stock lude at 10:1 is not a great turbo ready set up.

You need to remember the turbo creates its own compression when it makes boost. This is magnified by the piston's compression. This is the main reason that most turbo cars come with less than 8.5:1.

If you want more off turbo power, you need to look into head work, or maybe a less restrictive intercooler. Maybe a better exhaust manifold. Something that decreases spool time.

yes it's apples to oranges. what i'm getting at is i would keep the factory CR, get forged everything, and boost that (as long as your tuner know's what he's doing).
do you have any E85 near you??
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2001 Kawasaki STX1100 D.I. - Sold!
2007 Sea-Doo RXT 215; ET 127 +3 S/C impeller, DIY 3" intake, DIY resonator delete/free flow exhaust, DIY oil catch can, Rule 500gph bilge pump


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Originally Posted by Brash View Post
But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 08-18-2011, 01:17 PM
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Re: I can't win

I wish we had e85 here.

9.1:1 c/r
91mm bore x 96mm stroke (depending on sleeves)
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Old 08-18-2011, 06:34 PM
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Re: I can't win

pm'd about ur issue
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Old 08-18-2011, 08:53 PM
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Re: I can't win

gonna be such a monster engine when its finished
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Old 08-18-2011, 09:53 PM
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Re: I can't win

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gonna be such a monster engine when its finished
That's the issue. It will be pretty much useless without slicks. Probably going to have tranny issues. I keep trying to figure out how to get v8 numbers out of a front wheel drive v6.

I need to get myself in check before I start giving out my card number.
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someone attempting to be a smartass while still not answering the question, useful. Research my balls in your mouth.
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Old 08-19-2011, 12:22 AM
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Re: I can't win

actually noober gonna have to call you on that my dads car runs 9.5 from the factory on 15 lbs of boost. You'll wanna really pay attention to the CFM vs the PSI of a turbo charger. you can run all the pressure you want but its the amount of air that really counts and that would kill your engine quicker than anything. 9.1-9.5 C/R in that engine with a t3/t4 or a 16g would be perfectly safe and quite effective and efficient for a track/DD...as long as you have adequate cooling of course. and to answer the displacement question, you will get more TQ with extra displacement to offset the "lag" from the turbo but with that engine breathing properly and efficiently your spool up time should be damn near unnoticeable unless you have a huge intercooler and pipes that are oversized
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If my wang was bigger, I'd have sex with it.
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Old 08-19-2011, 01:00 AM
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Re: I can't win

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actually noober gonna have to call you on that my dads car runs 9.5 from the factory on 15 lbs of boost.
What car would that be?
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Old 08-19-2011, 01:10 AM
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Re: I can't win

mazdaspeed 6
http://www.mazdausa.com/MusaWeb/disp...ed6Performance
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If my wang was bigger, I'd have sex with it.

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Old 08-19-2011, 01:16 AM
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Re: I can't win

But its direct injection. So unless you plan on running DI how is that gonna be relative to this application?
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Old 08-19-2011, 01:16 AM
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Re: I can't win

Ranger - a t3/t4 would be undersized for the flow I need at top end. My cooling has already been upgraded (not including the external water pump and in-line reserve tank) and an oil cooler is next.

I <3 torque like everyone else but I understand lag. A rotrex would solve the issue but then there may be more power than I want at low rpm. I know the car will never be a DD again so I don't expect that either. I'm trying to build "manageable" power rather than a balls to the wall drag car.

Stroke will stay at 96mm but bore may change depending on the builders input.
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Old 08-19-2011, 01:30 AM
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Re: I can't win

you made it seem like it could not happen in your post. and it can be done with regular fuel injection on a better platform I.E the J series motor. not to mention my 1st h23 build ran 25,000 miles on stock internals @ 8 lbs on a 16g until the timing belt snapped once i fixed it i sold it and hell its still prob going strong. I never once had an issue with it, getting it tuned was the hardest part, now while not a serious build like this guy is doing or putting down numbers like the speed6 it was still a high compression turbo motor. its possible just harder and the only benefit is a little more tq before boost kicks in.
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