Building my SR20DET

[enigma2103]

i have an s13 sr20det red top motor(no 240 to put it in yet but soon).here what im doing right now: Crower Biller steel connecting rods, CP Forged pistons(8.5:1 compression ratio), Greedy Pulley kit, Greedy 1.2mm Metal head gasket, hks valve spring set, hks rocker arm stoppers, hks cam gears. now heres are my questions for you guys(some of them may be kinda lame but i just dont wanna mess up).1. should the intake and exhaust cam be the same?2. does any company make a complete turbo kit(i.e. intercooler,dowpipe,and everything else) or do i just find a turbo and bolt it on to the stock setup and upgrade all parts individually? this is my first buildup on a turbo engine. im used to doing sb and bb chevy race car motors.

[nzmoman]

no you dont have to have the same size cams on intake and exhaust. changing both is good and adjustability will be nice with cams that are close to each other so you dont want extreme differences.

there are several options for complete turbo kits, but there aren't as many that include the intercooler and injectors and downpipe. Usually when you know what kind of power you want to make you can figure out which direction to go much easier.

the turbo should be upgraded with your injectors, MAF, Intercooler, ECU, exhause and downpipe but this doesnt all have to happen at one time. Most people do the exhaust and intercooler first. with a tunable computer you can make changes to the other parts one at a time and tune them and get a turbo upgrade later. there are so many options on this it really will only matter if you plan on using this as a daily or not and how much money you got.

since youre in the head, look into valves and retainers(may come with the HKS kit), and a port/polish job also...neither are usually needed, but if you are going to be building the internals, you may as well really BUILD the internals, good luck and welcome to NICO this place is the best

[enigma2103]

thank you. im lookin for somewhere in the realm of like 300-400hp. itll be my second vehicle. the only valves and retainers ive found are made by skunks and they arent really for the sr20 they are for the honda b series motors. im thinking like stage 2 hks cams intake 272 and exhaust 264 or 272? definitly gettin the head port and polished.id love to get hks rods and pistons but their so damn expensive. should i think about replacing the exhaust manifold or is the stock one good?

[enigma2103]

how does this setup sound for the turbo and exhaust.megan racing exhaust manifold, garrett 2871 turbo, 72# injectors, 300zx maf, tial 38mm wastegate .6bar spring, hks 3" downpipe, greedy outlet pipe, Greedy rspl front mount intercooler with hot and cold pipes, hks or greedy ss bov, hks hi power cat back exhaust, and maybe a greedy s13 intake manifold.

[otterman]

how does this setup sound for the turbo and exhaust.megan racing exhaust manifold, garrett 2871 turbo, 72# injectors, 300zx maf, tial 38mm wastegate .6bar spring, hks 3" downpipe, greedy outlet pipe, Greedy rspl front mount intercooler with hot and cold pipes, hks or greedy ss bov, hks hi power cat back exhaust, and maybe a greedy s13 intake manifold.

Megan Racing Exhaust manifolds are known for cracking, especially when used on a track car. The HKS downpipe, Greddy outlet: you can save some money and get a different brand that's just as good but that's your choice

[180fan]

Depending on where you're at, you may want to look for different downpipes. If you live in an area where rust will be an issue, look for a stainless downpipe. The greddy elbow will be good but there are some knock offs on the market already that are decent. I've heard of fitment issues though. The HKS elbows won't really clear the steering column without a good amount of hammering. You can however fit power enterprise and kazama if you happen to find them. They are a very tight fit compared to the greddy though.

The HKS valve springs are a bit soft. You might want to consider Greddy, Tomei, Jun, Ferrea or Comp for the more commonly available springs.

You can also find an alternative to the Crower rods. I personally trust Carilllo to make exceptional rods without the weight of some of the other brands. You can also reuse your stock rods. They are monstrously strong for oem.

You can have different duration cams without too much hassle. I consulted some of my local domestic draggers on cams, and they gave me the following reason:"you're using forced induction. getting air into the cylinders isn't the issue, getting air out is. run a longer duration cam on the exhaust side" and it seems logical.

Before you go about planning a monster turbo, make sure your engine is running nice and strong before going to bigger turbos and new ecu's and injectors. It will make your initial troubleshooting that much more difficult. Especially considering that the quality of clips seems to be getting progressively worse.

[ILikeMy240sx]

how does this setup sound for the turbo and exhaust.megan racing exhaust manifold, garrett 2871 turbo, 72# injectors, 300zx maf, tial 38mm wastegate .6bar spring, hks 3" downpipe, greedy outlet pipe, Greedy rspl front mount intercooler with hot and cold pipes, hks or greedy ss bov, hks hi power cat back exhaust, and maybe a greedy s13 intake manifold.

that turbo .86 a/r should be good for 400RWHP assuming you have good supporting mods such as intake manifold and nice cams (these two are must if you want the power at high end) and also very importantly, nice tune.

Since you are upgrading to HKS step 2 cams, you would want to upgrade valve springs and retainers. Some companies that make them are JWT, Greddy, HKS, etc etc. Many companies make them.

[enigma2103]

yeah im putting it all together and testing it ot make sure everything goes smooth then im puttin the bigger turbo assembly on. ill revamp my list and then repost it later tonight and tell me what u guys think.

[nzmoman]

Megan Racing Exhaust manifolds are known for cracking, especially when used on a track car. The HKS downpipe, Greddy outlet: you can save some money and get a different brand that's just as good but that's your choice

ive only seen one megan manifold crack and it was replaced in three days by the company for free...they have a pretty good warranty! and this was on a 385whp car that had been recked at a driftin event. I know several people with them and no one has had issues.

Remember those big cams will give you top end power, but will also give you a funky idle, so they will be annoying at times on a street car in traffic. changing the exhaust manifold will increase turbo spool but it wont really add power.

the upgrades that you listed are more than enough to get 400 hp. but you should take 180fans advice. make sure that the motor is running well before throwing a bunch of things on it, because the price of motors is increasing and as he also said, the quality is going down. And if you have all this money to spend on a car alos make sure you tune as you add parts, this will maximize the reliability of your drivetrain and increase the ability to get exactly what you want in the end.