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Newbie 4cyl questions


 
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mx-k
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Joined: 13 Oct 2005

PostPosted: Thu Oct 13, 2005 2:32 pm    Post subject: Newbie 4cyl questions Reply with quote

Hello,

I am about to buy a 2002 TJ 4cyl. I would have preferred to get the i6 but I am getting an incredible deal on this one and its in immaculate condition.

My questions are mostly about the engine so here goes:

1) How is this engine for highway usage ie. can i go 120-130km/h easily and is passing vehicles a headache.

2) Second, why is the HP rating on a 2.5l engine so low? 120hp seems extremely low for such a large engine. What are the limiting factors? IE. compression ratio, intake, header, ignition etc?

3) Are there any proven dyno upgrades for this engine?
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ehirner
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PostPosted: Thu Oct 13, 2005 4:48 pm    Post subject: Re: Newbie 4cyl questions Reply with quote

mx-k wrote:
1) How is this engine for highway usage ie. can i go 120-130km/h easily and is passing vehicles a headache.

That's funny. It's a brick on wheels. The aerodynamics suck. It's a headache keeping speed on the highway.
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Keithtj
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PostPosted: Thu Oct 13, 2005 6:32 pm    Post subject: Reply with quote

I have a 4cyl on my 97 and I didn't know any better. No matter the deal unless it's almost free, wait out for the 6cyl.
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Code3TJ
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PostPosted: Thu Oct 13, 2005 6:59 pm    Post subject: Reply with quote

Keithtj wrote:
No matter the deal unless it's almost free, wait out for the 6cyl.

X2. That's about 75 mph, as long as you don't lift it, don't put on any weight and there isn't a headwind, you might be okay. But I wouldn't hold my breath.
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mx-k
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PostPosted: Thu Oct 13, 2005 8:58 pm    Post subject: Reply with quote

Well thats crappy news, this deal I can get on this TJ is great. Its only got about 40k km on it and its loaded. I can get it for $11,000 where as the average price here for one is like $17,000 or so. I just find it hard to fathom a 2.5l engine being so weak. I come from the world of imports where a 2.5l is monstrous and engines make close to 100 hp/ litre. Would it really be that much work to free up some horse power on these engines without going over the top?

Maybe I should just stick to my original plan and buy my friends rusted out 88 4runner and use that for winter/offroad driving.
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ehirner
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PostPosted: Fri Oct 14, 2005 1:34 pm    Post subject: Reply with quote

mx-k wrote:
Well thats crappy news, this deal I can get on this TJ is great. Its only got about 40k km on it and its loaded. I can get it for $11,000 where as the average price here for one is like $17,000 or so. I just find it hard to fathom a 2.5l engine being so weak. I come from the world of imports where a 2.5l is monstrous and engines make close to 100 hp/ litre. Would it really be that much work to free up some horse power on these engines without going over the top?

You're not factoring the effect of aerodynamics (one of those little ricers will flow through the air a lot smoother than a Wrangler...aka brick on wheels) or that the tuner engines you're used to are designed and built entirely different.
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mx-k
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PostPosted: Sat Oct 15, 2005 11:46 am    Post subject: Reply with quote

ehirner wrote:
mx-k wrote:
Well thats crappy news, this deal I can get on this TJ is great. Its only got about 40k km on it and its loaded. I can get it for $11,000 where as the average price here for one is like $17,000 or so. I just find it hard to fathom a 2.5l engine being so weak. I come from the world of imports where a 2.5l is monstrous and engines make close to 100 hp/ litre. Would it really be that much work to free up some horse power on these engines without going over the top?

You're not factoring the effect of aerodynamics (one of those little ricers will flow through the air a lot smoother than a Wrangler...aka brick on wheels) or that the tuner engines you're used to are designed and built entirely different.


I understand that, but aerodynamics have nothing to do with the power output of the engine itself.

What I'd really like to know is what kind of engine modifactions produce the biggest gains but at the same time are not going to cost more then just a swap to a larger engine all together.
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ehirner
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PostPosted: Sat Oct 15, 2005 12:51 pm    Post subject: Reply with quote

mx-k wrote:
I understand that, but aerodynamics have nothing to do with the power output of the engine itself.

But it does have everything to do with the vehicle being able to keep a steady highway speed (and get out of it's own way if something turns sour).

Quote:
What I'd really like to know is what kind of engine modifactions produce the biggest gains but at the same time are not going to cost more then just a swap to a larger engine all together.

The stuff that makes a significant difference....you'll be looking at turbos or superchargers. You can throw on headers, intakes, and exhausts...in the end, you don't see much improvement for the expense.
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