Sohc Performance

[SOHC 3k]

Ok my 3k owners,i need opinions in this area. Im considering upping the horses in my sohc 3k an thought about s/c and turbo,but with these take into consideration money,power gain,and upkeep of each,as you may know there is no turbo kit on the market for the sohc..so itll mostly be custom built,there is however a ripps s/c. What i need to know is will i get the power im looking for and safety staying NA or should i turbo or s/c? Not planning on doing the dohc swap.

[Ondontii]

n/a: get the heads/cams I keep sharing. There are threads on the special crower cam card info and Kmperformance.com heads from Ed.
Then do all the obvious n/a modifications like exhaust and intake (usually you do these first of course, they are like n/a supporting mods). Headers I would only do after EVERYTHING else is done and you dont need the money.

Dont do the ripp mods kit unless you want to spend thousands on the kit that doesnt fit and then spend more money throwing away all their tuning stuff that doesnt work and paying for your own.


Turbo: pain in the butt if you dont know what you are doing. The easy part is picking a good turbo. I would pick a gt3582 for a street car that wants to have a little traction. It will work great, even if you only run 5-10psi boost.

Building the manifolds and getting it to run properly (buy a wideband!) is difficult and it when you finish it a good dyno tune would be great.

The n/a mods will be easy, and give a very fun increase in power, plus sound great with those heads/cams.

Turbo will be very very expensive. You could also build a supercharger setup, probably a roots blower or a screw blower, but a rippmods kitt is a bad idea.

Building turbo manifolds would be fairly easy though if you just run pipes off each exhaust manifold and bring them together in 1 spot somewhere in your engine bay where you have room (like over the trans). If you want fancy manifolds then there is a lot more work involved.
But some books on turbocharging if you want to do a project like that. A Graham Bell's Forced Induction Performance tuning and cory bell's Maximum boost would be good ideas. Buy both.

[gipper72488]

i would stay away from a SC on a 3/s. im not saying that they cant work, its that many members have had to spend some serious $$$ to get a reliable set-up.

Turbo for the SOHC would be your best bet. i think kendo just got his sohc running 245whp on 6psi. after he gets some work done hes aiming for 10psi i believe.

the sohc runs 8.9:1 compression which is very boostable.
you will need
-turbo of your choice(as ondontii as he has a turbo soch in a different platform, td05 would be the best way to go imo as you have many upgrade choices)
-Blow off valve, unlkess you get the maft or map set-up you will have to recirculate the BOV or you will throw off your A/F readings as the 3/s MAF is pull htrough
-fuel controller. safc is the cheapest, but a MAFT and gm MAF is the easiest to tune. sohcstealth went with the mapecu2. its the most expensive but it gives you complete control, and has a laptop interface.
-injectors-depending on the boost, will depend on the size. i say get bigger than you will need to be safe
-fuel pump, get a walbro and hotwire it
-manifolds, unless you are goodwith a welder and pipe bender you are gonna have to have them made
-exhaust. you will need atleast a 2.5 inch exhaust, but i would get 3 inch
-intercooler. depending on the size of the turbo, you could probably do a DSM sidemount, but a FMIC would be more efficient
-intercooler pipe. you can get the ebay kits with all the couplers, but you are gonna want to have the pipes welded, as the couplers could leave yo with boost leaks
-wideband for a/f ratios
-boostgauge


if you are mtx i would suggest a stronger clutch and lsd
atx, shiftkit, highstall converter, and lsd

i think that will be all you need to run turbo on your car. that is considering you can do everything your self and dont have to pay labor.

BUT THE MOST IMPORTANT THING IS TO MAKE SURE THE 60K TUNE UP HAS BEEN DONE!!!!!! OR TURBOING YOUR CAR WILL BE A WASTE!!!!!!!!

[SOHC 3k]

I appreciate the intel,would a custom turbo kit be more or less expensive than the ripps s/c kit which is around 3100 for stage 1? If the pricing is near the ripps i may just stay NA.

[gipper72488]

Originally Posted by SOHC 3k

I appreciate the intel,would a custom turbo kit be more or less expensive than the ripps s/c kit which is around 3100 for stage 1? If the pricing is near the ripps i may just stay NA.

once again it depends on how much of the work you can do yourself, and if you know anyone that can help you if you need it. getting the manifolds fabbed up is the gonna be the hardest part. im not that great with a welder, but when i was gonna turbo my sohc, i was gonna fab my own manifolds(i was planning on the car being down awhile) lets see...i got the bov, boostgauge, turbo and flange, fmic, and injectors for 250$ spent. the local junkyard and ebay will be your friend.(i have heard bad things about ebay turbos, but at the same time my buddy is running a t3/t4 ebay turbo on his 300zx with no trouble) you could do the turbo set-up for 1500$ provided you can do all the work, minus the manifolds. thats something you will have to have a local shop look into for you. 1500$ is also assuming you are gonna use something simple like the safc-2 to tune with. the more advanced and newer the tuning device, the more $$$ you will have to spend.

[SOHC 3k]

Most of the work will have to be done by shop,no time on my hands and not enough knowledge when dealing with Turbo. What are some of the things i should worry about when going turbo/forced induction? Ecu i already know is one.

[new3000GTowner]

Originally Posted by Ondontii

n/a: get the heads/cams I keep sharing. There are threads on the special crower cam card info and Kmperformance.com heads from Ed.
Then do all the obvious n/a modifications like exhaust and intake (usually you do these first of course, they are like n/a supporting mods). Headers I would only do after EVERYTHING else is done and you dont need the money.

Dont do the ripp mods kit unless you want to spend thousands on the kit that doesnt fit and then spend more money throwing away all their tuning stuff that doesnt work and paying for your own.


Turbo: pain in the butt if you dont know what you are doing. The easy part is picking a good turbo. I would pick a gt3582 for a street car that wants to have a little traction. It will work great, even if you only run 5-10psi boost.

Building the manifolds and getting it to run properly (buy a wideband!) is difficult and it when you finish it a good dyno tune would be great.

The n/a mods will be easy, and give a very fun increase in power, plus sound great with those heads/cams.

Turbo will be very very expensive. You could also build a supercharger setup, probably a roots blower or a screw blower, but a rippmods kitt is a bad idea.

Building turbo manifolds would be fairly easy though if you just run pipes off each exhaust manifold and bring them together in 1 spot somewhere in your engine bay where you have room (like over the trans). If you want fancy manifolds then there is a lot more work involved.
But some books on turbocharging if you want to do a project like that. A Graham Bell's Forced Induction Performance tuning and cory bell's Maximum boost would be good ideas. Buy both.

I'm getting a turbo installed on my SOHC soon and was wondering if 7 psi would be safe since I see that your SOHC has lower psi.

[gipper72488]

Most of the work will have to be done by shop,no time on my hands and not enough knowledge when dealing with Turbo. What are some of the things i should worry about when going turbo/forced induction? Ecu i already know is one.

in all honesty if you dont have a good bit of knowledge about fi, then it would be better to learn more first. having a shop put you a turbo kit on your sohc will cost you some $$$. maTT did a 6g72 sohc turbo on a eclipse(24valve sohc) and he had over 200 hours of labor in it. we all know that he has extensive experience in that feild. to turbo the sohc will require either that you have a good bit of $$ to pay someone to do it/fix things when they break, or that you ahve the ability/knowledge to do it yourself.

I'm getting a turbo installed on my SOHC soon and was wondering if 7 psi would be safe since I see that your SOHC has lower psi.

ondontiis sohc uses a speed density set-up not maf, so it makes it harder for him to tune. the sohc running 8.9:1 compression should easily handle 10psi. as long as you have enought fuel, and timing to avoid knock, and a good tune, it shouldnt be a problem

[new3000GTowner]

Originally Posted by SOHC 3k

Most of the work will have to be done by shop,no time on my hands and not enough knowledge when dealing with Turbo. What are some of the things i should worry about when going turbo/forced induction? Ecu i already know is one.

Heres a single turbo sohc the guy spent about $3000 on it not bad and its a Garret Turbo.

YouTube - TalonMans(Justin) Single Turbo 3000gt

[s5pitfire]

Originally Posted by new3000GTowner

Heres a single turbo sohc the guy spent about $3000 on it not bad and its a Garret Turbo.

That's embarrassing for him! He labeled it, and called it a "VR4"
Even a FWD DOHC converted to TT motor isnt a "VR4" (more like VR2)
He said that he 'converted' it to a single turbo. Surely he knows he has the SOHC motor, with FWD setup, and did a custom single turbo setup

But thats the first video i've seen of a turbo sohc, and DRIVING it at that. Looked like it pulled well dispite him being very careful (only going to 5k rpm)... 6lbs aint much I bet it'd feel like a different car at 9-10 lbs and tuned on a dyno