A guide to turbocharging/forced induction

[YatesTunes]

keep the info coming. An educated customer is the best one

Will do, if you have anything you want to contribute it would be appreciated! Seriously, don't think I was bashing you. I've heard nothing but good things about you from my Hartford and Manchester buddies.

[GhettoJay]

thats my silver lol

[astroboy]

Good post, I like it. I think a bit needs to be added to the turbo section. A little of expansion on choosing an a/r for compressor and turbine to work with different engines and when the different a/r's will be effective (like a .83 a/r for a turbine will not spool below 4000rpm's whereas a .48 a/r for a turbine will be pushing about 14psi at 4000rpm's[depending on tuning, manifold, downpipe, and exhaust]) would be helpful to some I think. Also a bit on compressor efficency may be beneficial to the readers seeing how there is talk of heatsoak from exhaust and exhaust backpressure. One of the major causes of the heat that is produced is from the act of compressing the air via the compressor wheel (from the molecules being accelerated and forced into a small area ie. intercooler and associated pipes). One thing I have a lot of trouble figguring out is how to determine spec's of a turbo from it's lable (td04rl, GT2871RS, ect) but I think some of it is from having a fromialarity of some types that are commonly used like the td04. As far as I understand the less intercooler piping (and proper size) the better response because the turbo has less area to pressurize so short intercooler pipes that are only the size you need are beneficial. The downside to that is the throttle control is not as smooth due to the volume of air that is compressed. From what I have read on intercoolers they are not needed (but are adventageous) at about 7 psi and less. These systems would be able to be piped from turbo to intake manifold straight shot. And with intercoolers I have seen them painted black with thermal transfer paint to keep the "look at me" factor down but I have never seen anybody do a controlled test recording intake air temps of a painted and non-painted intercooler (the painted will have issues shedding the heat but I don't have any idea the effects). I have wondered if they would be great in difference. Also the larger and more free flowing exhaust on a turbo system the better (except for when it flows too well and the wastegate can't vent the proper amount of exhaust thus resulting in boost creep). I have seen great results on most every system with 3" exhaust, a 3" high flow cat, and a straight thru muffler (aka resinator).

[YatesTunes]

Thanks for the input! I've added it in quotes on the first page. I'll write up something about downpipes unless someone else wants to, exhausts as well. Maybe we can throw something in there about being smart and running a catalytic converter. I always use them and recommend them. I just get universal ones made for older Chevy 350's. They're cheap and flow a lot more than a Honda four cylinder can make.

Also I actually did a test with the flat black intercooler. The temperature difference was near minimal or sometimes even the same on certain days. Even though the black doesn't reflect heat the intercooler stays cool from the ram air of driving pulling the heat away.

[Bxdragon]

bumpp for the good work

[astroboy]

Neat, I have been wanting to paint mine but have not yet (I read something about oven paint and it having good thermal properties) because I am worried about having a less efficient intercooler. For cat's I use the ebay magnaflow universal ones. They work great! I will work on something about downpipes and exhaust if you'd like.

[H23VTECLUDE]

Very Nice write up & info given. I will sticky this.

[1gtok2o]

good shyt bro this gives a clear understanding to every dumb ricer out there that says im running at 18 psi of boost a clear understanding that it doesnt matter how many pounds you are running, it matters the size burbo you have. thanks yates for clearing that up

i hate that with a passion..they are like oohhh shit, the drop top is turbo..how many pounds you running...:rolleyes:..i mean at least ask me which turbo im running

[GhettoJay]

i hate that with a passion..they are like oohhh shit, the drop top is turbo..how many pounds you running...:rolleyes:..i mean at least ask me which turbo im running

Bro i feel you. They see this big as intercooler on my talon and there like you must be over 35psi. WTF

[YatesTunes]

Neat, I have been wanting to paint mine but have not yet (I read something about oven paint and it having good thermal properties) because I am worried about having a less efficient intercooler. For cat's I use the ebay magnaflow universal ones. They work great! I will work on something about downpipes and exhaust if you'd like.

Definitely!

Very Nice write up & info given. I will sticky this.

Thanks!



I added a bit about crankcase ventilation..

[egkid129]

i hate that with a passion..they are like oohhh shit, the drop top is turbo..how many pounds you running...:rolleyes:..i mean at least ask me which turbo im running

lol fuken ricerz,dey make me laugh.......an itz funny wen dey talk shyt but dere ridin shot gun in dere buyz car,lol..............(i've had 2 many of dose encounterz)lmao

[astroboy]

I like the addition of crank case ventilation. In general I like to use a catchcan (ebay naturally) full of steel wool or something like that to break up the airflow in order to remove more particles of oil. I have the one that has 3 nipples on it with one hooked to the original pcv (well original spot but a pcv from a gtx), one hooked to the intake before the turbo in order to put a suction on the crankcase, and one to the crankcase. Seems to work well enough.

So here's what I know about exhaust...the general rule is the golden one: the less backpressure the better. The best way to achieve this is to have no (or very little) exhaust after the turbo but it is also the best way to get pulled over and ticketed. The next best thing to do it to have a decent diamater exhaust (above 2" but in general over 3" is overkill unless it is a turbo 6L) with a high flow cat and a free flowing muffler. The high flow cat's will net you about 1 less wheel hp which is negatable, you won't get any tickets, it will act as a resinator helping to keep the volume down and the tone sounding nice, and lastly will make sure you keep passing emissions and keep you from getting tickets. For a muffler it is personal preferance but the straight thru design net's the least amount of backpressure (good) but most amount of noise (bad). But there is a plus to having a turbine up stream of the muffler...it helps to reduce noise by about 1/3 except when the wastegate is open. I have read that magnaflow works best for quieting and low backpressure. You can go with a singal chamber muffler to cut noise down and take a slight performance hit. When having an external wastegate the exhaust should be plumbed back into the exhaust system after the turbo at the lowest ange as possible (you could have a seperate exhaust system or vent to atmosphere but it is not that much more beneficial imo). The O2 sensor should be downstream of that to facilitate good mixture of exhaust gasses before the O2 sensor sees/reads it. When buying/building an exhaust system you want to use manderal bent pipes (smooth inner diamater vs crinkley crush bends) and low bend radius' to have the smoothest flow. I think of exhaust flow like water kinds where large bends would create edy's and crush bent pipes would create turbulance (kinda like rapids in a river). That's about it!

[YatesTunes]

thank you, sir!

[jdmjuni]

Bump for a very nice write up!

[jrem1]

he all ready started lol but he is on vacation in dominican republic right now