quote:

Originally posted by VERTiG0 Uh, you want as little backpressure as possible with a turbocharged car. You want that exhaust OUT, and if theres a lot of backpressure you're going to get reversion, which causes the engines' internals to heat up far more than they would normally... This can lead to detonation, which can potentially destroy your engine PS: MarkT: You're kidding about the Escort not being riced up... Right?

Not entirely true. With very little back pressure, especially with a larger turbo housing, it would take a long time for your turbo to spool tothe proper rpm, and hence you would suffer turbo lag. Back pressure is important for a turbo, and as for the overheating issue, the blow off valve is designed to release the excess pressure that the turbo cannot utilize.

*sigh*

You guys are really making me miss my ride


This is what I'm sportin' now....a 2004 Mazda 6 Wagon.

Its a great car, but I wish I got it in manual....dumbass dealer screwed up everything (long story).




If I had money, and it wasnt on a lease, I'd still do a few things to it.....drop it just a tad, an intake and a nicer exhaust...plus maybe some stiffer sway bars and stiffer shocks. Not too much, but just enough to make it more "sporty".

Is it just me, or does anyone who have built a ride, and then grew up (read "had more pressing bills to pay..." ), still would without a doubt on pretty much on any car they buy in the future still drop it and slap on bigger rims and better rubber, even if they do absolutely nothing else?

Okay I tried accessing my Civic links from work and saw that you can't so here are the pics:

Smokey Cannon...


Sparco Pedals...


Money shot...the flag, by the way, is for my web group of Ferrari F1 fans (actually it's the official manufacturer's fan site: www.ferrariworld.com) pretty good perks, like the flag! And the driver's a friend, not me!


Corner pose with the TANABE in all its glory...


Action shot...


And full-frontal!

I have to admit, I deserve a Rice Ticket for the oversized exhaust tip, especially because it wasn't set smugly in the bumper (there was like a 1-1.5 inch gap between the steel and the plastic but I was planning on getting a skirt package that would take care of that.

You don't see a pic of what she looked like after I installed the Eibach Pro Kit springs with the Koni Yellow shocks. My next task was to get the upgraded brake kit (didn't want to get better rims without red calipers; the rusty stock ones would look dirty)...but then I crashed it.

I didn't deserve to have that car at that age; I was WAY too immature. Story of my accident:

I was with my fiancee (then girlfriend) on July 23, 2001. It was a Monday morning I'll never forget. We had just been to my bank branch to pick up a balance confirmation and draft that I was going to take to the French Consulate down at Bloor and Avenue Rd. I was planning on moving to Paris for a year (where my fiancee is from) to live and work, after graduation.

I was getting on the 401 westbound ramp from southbound Kennedy, cruising, when this 2001 BMW 3-series was riding my ass. I wasn't going slow or anything, but the guy was going left to right, DIRECTLY on my ass, looking like he wanted to overtake me on the single-lane ramp!

I eventually got pissed off and dropped the hammer and just took off. It was 10:30 am on Monday morning; most of the traffic died down but there were still quite a few cars and rigs. I must have been going at about 170, weaving through traffic and I was actually losing the guy. I finally decided to give up and move to the centre lane, and the guy caught up and tried to block the middle to keep me from changing lanes. Obviously I was pretty stupid, but at this point the guy was scaring me with his psychotic behaviour.

Anyway, I swerve to the left, and he quickly comes around to my left! So when I tried to go back left, I wasn't looking, and I clipped a Nissan Pathfinder (probably at about 130-140 km/h at this point). My rear bumper corner (passenger side) just touched the front left corner of the SUV and it threw me into an unrecoverable spin, across the 4 lanes of the collector's, just west of Warden.

I can remember thinking, "Please God, don't let any cars hit us" and I saw headlights TWICE as we did a 720 across the highway. Thank God He answered my call and we ended up smashing nose-first into the concrete barrier. The enging was completely smashed in.

My fiancee told me to slow down just as I started to take off from Kennedy but I ignored her. Then she was somehow able to look down and read her magazine as I was going nuts. She was used to it from my history of speeding tickets and stupidity so she ignored it. Only this time, she had seatbelt burns, a broken ankle, and an aching neck.

Ever since that day, I vowed NEVER to soup up my car again and drive WAY more responsibly. Which is why I have a dilemma: a Prelude with so much potential and a desire for the mods, but a conscience that will always feel guilty!

Well, that's enough from me. Hope I didn't bore you guys to death!

Fahad

Yeah, there's more, like what happened with the cops, my licence, my trip to France, etc...will save it for your questions! (If you care!)
F

quote:

Originally posted by Tranceplanted Not entirely true. With very little back pressure, especially with a larger turbo housing, it would take a long time for your turbo to spool tothe proper rpm, and hence you would suffer turbo lag. Back pressure is important for a turbo, and as for the overheating issue, the blow off valve is designed to release the excess pressure that the turbo cannot utilize.

No, no no no. The turbocharger itself provides backpressure that the engine needs, that an exhaust would provide for a normally aspirated car. If you could, you'd be best off running no exhaust straight out of the turbo which would allow for the freest flowing turbine wheel. More backpressure from the exhaust makes your turbo very efficient. You should read some of Garrett's technical writeups

As for the BOV, that wouldn't help at all becuase the BOV is before the throttle. If it were, say, in the cylinders or something sure that'd help, but since it isn't, that doesn't work at all. Not all cars have BOVs anyway, or can even make real use of them. Twin turbo 300ZXs are usually much more efficient with recirc valves than BOVs because of the silly "do-everything-twice" design of the VG30DETT. However, some of the newer BOVs out there can open faster than recirc valves and therefore keep the turbo spoooled up marginally longer. It's not much, but any performance gain is good.*


*all from my hardcore 300ZX TT buddy

Last edited by VERTiG0 on Mar-31-2005 at 19:07

quote:

Originally posted by Skuce Since I'm here....might as well throw up a few shots of my car. it's going to have another nice little item under the hood this year...tired of being slow-ish meh...it's all good http://www.streetsourcemag.com/Prof...Profileid=32750

I think your the guy that put the lambo doors on my friend Caynes car

fayaree, your Civic was clean. Very clean. All except for that relatively useless muffler Your Prelude, yes, more potential, but also weighs some 3400lbs I believe. That's a HEAVY ASS CAR. More of a grand tourer than anything. Plus, it's FWD

WTF...I thought I posted a reply last night...

backpressure in a turbo app is BAD. Don't take my word for it...read the bible itself "Maximum Boost" by Corky Bell..."Backpressure in an exhaust system is evil". (refering to turbo apps). pipe size has less to do with backpressure than exhaust layout and the components themselves (header, cat, muffler).

A guy I know, an engineer who formally worked for Ford and who has designed, built, installed and tuned his own turbo application on a Focus, had this to say: The problem is that so many people go find the biggest turbo they can fit in there because they want huge top end power. Problem going big is that their turbo takes forever to spool, at a high rpm level, then kicks you in the ass when it finally does. While great on the drag strip, it's not so great for a daily driver, track car, or auto-x car. His philosophy is to set a power goal and then use the smallest turbo that will get you there. His Focus spools with almost NO lag and drives as smooth as it did from the factory.

Getting the flame suit ready, but BOVs seem to generally be *lame* from a performance perspective. Doesn't venting to the atmosphere, instead of recirculating that air via a bypass valve, briefly mess up a/f (when shifting) since the incoming air has already been measured before the BOV? Turbo gurus can correct me, but I think I've got this right. Since the BOV vents the excess air (when shifting) instead of recirculating it, the actual air/fuel ratio is NOT what the ECU thinks it is and you briefly run rich when you shift. This may or may not be a big deal for some applications...but...it sure could be on others. Bypass valve > blow-off valve...but people like the cool sound BOVs make, lol.

Prelude? nah...those cars are *pigs* (far too heavy for their power level). You'll find very few "fast" Preludes out there that didn't cost a fortune to get that way or aren't gutted. Many tuners shun them for *much* easier/economical modding of Civics or even Integras (though I don't care for either of them either, lol).

Vertigo...I'm serious...how is that car "rice"??? Ok, I *really* don't like the plate relocation...but rice, IMHO, is a car modified to look fast when it isn't. ie. mods that *imply* performance where none exists or actually impair performance (fart pipe exhausts, big aluminum wings, over the top F'n'F style body kits on stock cars, slamming a car on cheap springs without dampers, etc).

He's done a lot of work to the car, but nothing that implies it's "fast". Shaved handles, the drop (with decent components, not just lame springs resulting in a bouncy ride), plate relocation, etc. maybe it's not your or my taste, but it's definitely not rice.

Yes, BOVs are pretty much just for show.

quote:

Originally posted by MarkT Vertigo...I'm serious...how is that car "rice"??? Ok, I *really* don't like the plate relocation...but rice, IMHO, is a car modified to look fast when it isn't. ie. mods that *imply* performance where none exists or actually impair performance (fart pipe exhausts, big aluminum wings, over the top F'n'F style body kits on stock cars, slamming a car on cheap springs without dampers, etc). He's done a lot of work to the car, but nothing that implies it's "fast". Shaved handles, the drop (with decent components, not just lame springs resulting in a bouncy ride), plate relocation, etc. maybe it's not your or my taste, but it's definitely not rice.

I guess our definitions of rice are different. To me, the car is ridiculous But whatever, to each his own.

Myself - I think show cars are retarded as hell.