maybe i got it right this time lol

[flyboy367]

well ive been doing alot of reading. spending alot for the sr20 is out of my league. but building a dohc engine from a stock s14(?) to replace the s13 sohc that in the 90 im probably ending up with is more on. what things swap across from these engines and their japenese counterparts? i have access to a machine shop and all so labor would be next to nothing. just paying for parts. i want turbo of course. i have a freind that know tuning for turbos, but an opinion from you guys works great to. id like to have a 12second ish car on dr's but be ok for daily driving. also i have a friend wo works at a wrecking yard. any parts i can look for there as opposed to big money new stuff?

[virus77]

Is it me or is that confusing and I cant tell what hes trying to say. What is it you are asking for?

[hannibal]

You can turbo the SOHC motor in the 1990. I would swap in the DOHC only if you have to replace the KA-E.

A lot of guys have been using the T25 turbo from the SR20. Dont know if you can hit 12's with it though. Check out the T3 turbo from a 84-88 300ZX. But you can bolt on any turbo you find in the junkyard.

[hysteria]

translation, (i think):i am swapping a sohc engine for a dohc engine. what parts are interchangeable between these 2 engines. i want a 12 second car. what can i get cheap, what do i NEED to spend money on.

not sure about the interchangeablilty issue. i think there are a lot of parts that will work on both engine. i currently have an sohc, and a dohc, and they look very similar, except for the obvious differences in head and manifolds.

as far as what you can go cheap on: you can get everything cheap except fuel management... if you want a 12 second car and you don't have good fuel management then you'l blow up the engine for sure...

[get_up_mark]

the problem with running a t25 or even t28 is that you can build an extremely cheap set up with this turbo, but you will have to run at higher boost than with a bigger turbo with low boost. the lower boost you run, the cheaper fuel products needed.

[virus77]

the problem with running a t25 or even t28 is that you can build an extremely cheap set up with this turbo, but you will have to run at higher boost than with a bigger turbo with low boost. the lower boost you run, the cheaper fuel products needed.

low boost on a big turbo can be the same as high boost on a smaller turbo, the same fuel "products" will be needed.

[get_up_mark]

i understand that. but hes trying to keep it cheap so would recomend an fmu with fuel pump and bigger turbo. fmue is good for 10 lbs of boost or so. no need for huge injectors like you would need to run higher boost. that would be more money. also with higher boost there must be a product to control timing such as e manage (300) tuned ecu (500). fmu +fuel pump=200

[virus77]

You seem to think that the boost number in PSI is the factor that determines what management you need. You can run a FMU on a small or big turbo its teh same. For instance(theoretical numbers): 8 psi from a big turbo with a 12:1 fmu gives 96 psi extra in the rail. 12 psi from a smaller turbo with 8:1 fmu also gives 96 psi extra in the rail. This is a common mistake when people talk about PSI in every aspect, like "how much psi can I run on a stock block".
Modified by virus77 at 8:12 PM 5/17/2005

[WDRacing]

Unless he's swapping out the MAf he's stuck at 250 or so anyway. So a set of 370's and a SAFCII will work much better then a FMU and fuel pump.

Keep the SOHC and boost the hell out of it. If you blow it up, you can swap over quite a bit of the parts for the turbo kit except the manifold. It's just far easier to boost the motor that in the car already.

WD

[flyboy367]

well if i get the car im looking at it has 130xxx miles already on it. i drive about 145 per day to and from work. so i dont really want to comprimise the stock motor to much. id rather spend it on building a fresh motor and doing it right then having a 0 mile engine break it and and then pound on it. if the sohc is better then i rebuild one of them, but either way im gona have the motor built so i can swap in a day, tune the next and go back to work on monday.

[virus77]

If you are building the motor I would say get a DOHC since the motor will be out anyway. that way you can build the DOHC on the side and drive the way it is and swap it in when the DOHC is ready.

[gabossie]

well ive been doing alot of reading. spending alot for the sr20 is out of my league. but building a dohc engine from a stock s14(?) to replace the s13 sohc that in the 90 im probably ending up with is more on.

Time to do some more reading... if getting an SR is way out of your league, chances are a KAT is too. It's never a cheap endevor, just ask around. You can piece together a low boost system for pretty reasonable, but it's not gonna be a 12 second car.

[flyboy367]

what i meant by it was that if anything broke id have to wait to get replacements from overseas. i can build just about anything. i just rather use stuff available stateside. plus the extra.4 cant hurt either. the car is a daily driver. so if the worst should happen or something stupid i cant afford to not get to work. i run my district.