Official Automotive talk thread?

[Python14]

I've noticed that like one in three threads in this Forum are Automotive related. Mayby, we should have a single, stickied Automotive thread where everyone can ask and answer questions, post pictures, debate aspects, and talk to about the subject in general. Mayby it has been suggested before, but I think it's worth a second suggestion. Anyone else agree with me?

[Gotenks]

hmmm ok I have been having an issue lately

People say you should not put high compression pistons with turbos in a honda......

Well I need to raise the bs flag.

So, you install forged 9:1 static compression pistons to your engine... run 7 pounds of boost, you well get a effective compression ratio of 12.54:1.

in my engine, the stock static compression with 7 pounds of boost will give an effective CR of 14.31:1, while on raising static compression about a point to 10.5:1 pistons will make the effective CR 15.50:1 at 7 pounds of boost.

now, in order to get 15.50:1 with low compression pistons(like everyone suggest you do when you turbo your honda) you will need to run 12 pounds of boost.

And then after that, the 10.5:1 pistons with 7 pounds of boost make a lot more power in the lower end than the dish top pistons, and with more powerful exhaust pulses, cause a quicker spool up. And it can't be bad to have more stress in the low end, cause its the high end to worry about.

And your car will be more efficient. It will make more power for the air and fuel it consumes, make more power in the lower power range.

So I don't get why its always said to use low compression pistons? maybe its a marketing scam?

Because yes, it will require tuning, but then why do people put the tuning effort to make the engine run reliably on 13 pounds of boost, with no low end, when you could make just as much power with a little more than half that amount of boost, with even more low end power?

Yes, I can understand detonation is a problem, but its the same amount of heat produced with high compression pistons, low boost, than low compression pistons, high boost, same stresses to the engine.

so, my conclusion is.... marketing scam, or something I just don't realize.

[Puddleglum]

Well, does anyone think that and older E36 M3 can beat a 2001 S4????

[CoFFeY[NiTrO]]

my brother just turned 16 and he might be buying a 66 4 door nova for like 900 it still runs, and my dad my brother and I are going to fix it up, its gonna be tons of fun

[FooTemps]

well, i'm turning 16 soon and i'm going to try to find an AE86 Trueno/Levin. lol, yes! old japanese car! MAYBE SOMEONE ::coughgotenksxencough:: SHOULD HOOK ME UP WITH SOME PARTS DISCOUNTS SO I CAN RESTORE THE CAR! lol

[rhetor22]

Gotenks- here is my personal advice.

I know this will not concern you at all, but i feel like i must say it.

Turbo chargers are not safe. They are especially not safe on a small 4 cylinder engine. The blocks are not made to handle very much stress.

craming fuel mixture into your engine is not very good for it at all. It will give you phenominal power gains, but its horrible for the engine. I would not recomend puting on there.

I would only heavily modify VERY good engines, ones that are tested and true. This means engines that are more than a few years old. A Ford 302ci, 4.9L (commonly known as a 5.0L) is known to be a great engine for modification, so i would feel safe with it.

I would never put a turbo on an alluminum block. Only on a cast iron. Hell i would never put a turbo on anything. To me, the power that a turbo gives you is fake. If you compare the power bands of a 250hp turbo engine and an N/A 250hp engine, you'll find that the powerband on the N/A is much flatter and starts to climb faster at a much lower RPM.


Please don't take this personaly, i'm not bashing your car, i'm not bashing turbos. I just hate them.

[FooTemps]

Originally posted by rhetor22
Gotenks- here is my personal advice.

I know this will not concern you at all, but i feel like i must say it.

Turbo chargers are not safe. They are especially not safe on a small 4 cylinder engine. The blocks are not made to handle very much stress.

craming fuel mixture into your engine is not very good for it at all. It will give you phenominal power gains, but its horrible for the engine. I would not recomend puting on there.

I would only heavily modify VERY good engines, ones that are tested and true. This means engines that are more than a few years old. A Ford 302ci, 4.9L (commonly known as a 5.0L) is known to be a great engine for modification, so i would feel safe with it.

I would never put a turbo on an alluminum block. Only on a cast iron. Hell i would never put a turbo on anything. To me, the power that a turbo gives you is fake. If you compare the power bands of a 250hp turbo engine and an N/A 250hp engine, you'll find that the powerband on the N/A is much flatter and starts to climb faster at a much lower RPM.


Please don't take this personaly, i'm not bashing your car, i'm not bashing turbos. I just hate them.

yay! N/A buddie!!!

[Gotenks]

whoa buddy

I'm not a bit concerned about the structural integrity of my 1.8 litre engine =)

I'm getting it resleeved with ductile iron, forged eagle rods, and forged pistons, and replaces the valves, and getting forged head screws.

hondas crankshafts are very strong, people with 500 horsepower drag civics use the stock crankshaft.

the engine can take it, but I'm worried about the immense amount of heat its going to make, and I am going to retard the timing a bit, but I dont want to retard it a WHOLE lot, thats just flushing power down the drain from poor tuning.

well, the reason you need to replace a lot of stuff in a honda engine is, because the engines are definitely tuned for natural aspiration, meaning parts that aren't so strong because theyre lightweight, inorder to reduce reciprocating mass.


look at the sr20det from nissan, and the 2JZ-GTE from toyota, inline4, and inline-6 cylinders, are TANKS compared to that 5.0 litre v8.

when you purchased a supra, the 2jz under the hood was pretty much a detuned 500 horsepower engine, only to meet the 280 horsepower gentlemens agreement in japan.

the sr20det might not be capable of 500 horsepower on its stock block, but it can do 300.

my goal, is at the max 250 horsepower to the wheels, but even with 250 horsepower, traction will be a curse (*shakes fist at honda "you should of made cheaper rear-wheel drive cars like toyota and nissan did!!! argh!!!")

[rhetor22]

i never did understand the point of a 500hp front wheel drive car...

I'm glad you know what you're doing though.

I just hate new age upgrading. All you do is get a chip, an exhaust and intake, and the occasional turbo. Whatever happened to boring out ports, polishing everything you could, and a nice set of headers? I like cars that get 6-9mpg. :)

[bornl33t]

ya know, I think it's hard to talk aobut cars anymore without offending someone. So while it's a good idea to put everything into ONE thread, I don't think it's going to last and at the very least I think it's going t obe a thread I will refrain from visiting in the interest of NOT causeing a riot because I'm sure sooner or later this thread will be shut down, and I can just hear what army's comment to it will be

but 110% on the initiative!

[rhetor22]

I love all makes and models of cars! They are a great way to get places!

Nice car dude!

[venturesomerite]

i want a 71 nova. chevelles are too expensive.

[Gotenks]

yes

I think we can make this thread work.

I love all cars.

I am just really into my "honda" thats all.

yes, I understand that no matter what, I am going to get tormented by other car enthusiasts for being behind the "H" Badge, and defending it so much.

Well, a new age of supercars will be coming from japan, so europe and america better watch out, thats all I'm sayin!

I think right now, the car with the BEST value is the z06 corvette, the car impresses me much.

And when you get it tuned by lingenfelter.... well....... for $150,000, no other car will touch it in its price range, and it will smoke cars that cost a lot more.

mad props to chevy.... but wait 1-2 years for hondas new beast..... 2nd gen nsx

[Zumina]

What car did you end up with anyway Gotenks? A while ago you were considering a Prelude, then you spoke of an Integra... At any rate, [sleeved] Aluminum blocks are best when it comes to high CRs (turbo and S/C). Why? Aluminum dissapates heat (a biproduct of the internal combustion engine ) a lot better than cast iron.

[Zumina]

Personally, I can't wait for the Cadillac Evoqe. That's going to be one hell of a car! 800hp, 3600lbs, and CADILLAC styling.