SOHC Turbo Build For Dummies

Yup, post them single slammers here....
veilside180sx
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SOHC Turbo Build For Dummies

Post by veilside180sx » Tue Aug 23, 2005 4:53 pm

These are the Prerequisites to building a SOHC Turbo. Together we will go through typical setups from mild to extreme to reach the power goals you desire. These are lists of typically used items that are easily attainable by the average person. All setups should have the Air to Fuel Ratio verified on a dyno with wideband or at very least on a track using an in-car wideband setup (NO watching the standard O2 signal and calling it good). If your using pump gas and seeing air to fuel ratios more lean than 11.8:1-12:1, some rethinking on the tuning/fuel setup will be needed. A narrowband guage(typical A/F guage from Autometer for instance) is not complex enough to be a real indication of the ratios inside your combustion chamber.



Very Mild Build: around 180 rwhp

Turbo Manifold
Blow Off Valve
Turbo (T25)
Downpipe 2.5" is perfectly fine
Pipe to connect turbo to throttle body

Fuel Control:
FMU (not recommended, but doable) Raises fuel pressure per boost to make injectors flow more than normal.
DSM 450cc Injectors or Comparable (These injectors are low impedence, while the ECU requires high impedence. Making it necessary to wire in resistors to alter that so the ECU can control them. These can be found at places found at the bottom)
Apexi SAFC2
Greddy Emanage


Mild power adder, say you want around 200 rwhp.


Turbo Manifold
Blow Off Valve
Small Intercooler (potentially get away with a side mount)
Turbo T25/T28/14B, etc. Smaller T2 setups. Usually will be internally wastegated.
Downpipe 2.5" is perfectly fine
Replacing the Exhaust is starting to be very necessary at this stage, so I would start to shop for that as well.

Fuel Control
DSM 450cc Injectors
Apexi SAFC2
Greddy Emanage
Back off base timing at distributor or MSD BTM

Average: 300 rwhp to 350 rwhp, you have to start to expect a little more lag. This is about the perfect "street car" limit. No race gas, just good honest street car fun that is fully capable of bring home a 12 second timeslip on a good run.

Turbo Manifold
T3/T04E .50 Trim compressor, .60 trim compressor housing / Stg 3 (aka TA31) turbine wheel, .48 to .63 A/R exhaust housing. Internal wastegate optional but not recommended.
Downpipe can still be 2.5", but this is as far as I would want to push that.
Front Mount Intercooler (FMIC) It's time to upgrade to a larger front mount as the larger will push more air than the smaller sidemount can cool.

Fuel Control
550cc Injectors
SAFC2 to control your fuel injectors, along with the stock ecu.
MSD BTM At this stage I would be running the BTM to control timing retard.
Reflashed ECU-This can be a DIY thing with Eprom Tuning or a JWT. This is the largest JWT is capable of flashing for those that want it.
Z32 Maf is required, as the stock Maf stops being able to read at around 260 rwhp.
Wideband O2 Sensor should be installed for tuning.

Block Internals
This is where I would start to consider it necessary to replace you pistons.

Above Average: 350 rwhp to 425 rwhp

Turbo Manifold
Blow Off Valve
T3/T04E 50 Trim .48/.63 or slightly larger turbo, this is where I would start to make the switch up to an external wastegate. You have the option to reroute it back into the exhaust, or merely "dump" it out into the open. "Dump" is usually a mini exhaust in the form of 1.5" piping routed out to the open.
FMIC Larger is starting to be necessary. Typical for setups from here on, are 12"x24"x3" for the core.
Downpipe 3", at this point I would switch to the larger downpipe. You can probably get away with it at 2.5", but it will be causing a little bit of backpressure. Moving to 3" piping as quickly as possible is what you want though. Usually it is necessary to have the first bend 2.5" to clear the steering shaft though.
Exhaust 3"

Block Internals
At this stage you'll want to "build" or fortify your block to better handle boost. Previous to this you can walk the line, but here and forward I find it necessary to do so.
Forged Rods
Forged Pistons
Stock Crank
Plus your typical rebuild items.


Fuel Control
Standalone fuel management is recommended at this stage in the game and is absolutely necessary at the next. These allow you control not only very large injectors, but the tuner to have complete control over both timing and fuel.
720cc Injectors.
Wideband O2 Sensor is necessary for tuning.

Wild Build: 425 rwhp to 600 rwhp. Lag is obviously going to be much more apparent, full boost isn't going to happen until around 4000-5000 rpms or so. Once spooled it will pull very hard.

Turbo Manifold
Turbo T3/T61/SC61 or GT35R seem to be the typical turbo's in the area. External Wastegate is your only option that should be considered.
Blow Off Valve You'll want a good performing more expensive blow off valve to alleviate reverted air when the throttle body closes from pushing against the compressor wheel.
FMIC the 24"x12"x3" Core's are still effective in this range.
Downpipe 3" is still capable of handling these power levels
Exhaust 3" or larger

Fuel Control
720cc-1600cc Injectors
Standalone Fuel Management
Recommeded to switch to Map instead of Maf for reading airflow.
Wideband 02 Sensor installed and wired into standalone for adjustments and monitoring.
Dyno tuning is very valuable.

Block Internals
Along with the previously mentioned internals I would add these to the list
Cam (per your discretion)
Build your head as well
Solid Lifter Conversion (not required, but not a bad idea)
Valve Springs
Valve Retainers
ARP Head/Main Studs
Cometic Headgasket or similar


Absolute turbo necessities...amongst the aforementioned goodies above.

Oil Lines (Picture of good return location)
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Boost gauge

Here's lists of aftermarket products that are currently on the market

Turbo Build Parts

Turbo Manifold (Exhaust Manifold)

JGS Precision

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Realnissan.com

Import-AutoPerformance.com

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Nizzx.com

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BOV

Tial
Greddy RS
JGS
HKS SSQV

Wastegates

Tial

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JGS

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Turbonetics

Block Internals

Pistons: Can be accomplished one of two ways, by purchasing ones that are made for the E with their intended compression ratio. The other is to use DE pistons and subtract a full compression point to equal the difference between the E and DE head. (ie 9:1 DE pistons will be 8:1 in an E)

Arias 8.8:1(E)
Wiseco 9:1(DE) 8:1(E)
JE
Ross 8.5:1(E)
CP 9:1(DE) 8:1(E)

Rods: Any rod that will fit the bottom end of the DE will work with E as well.

Crower
Pauter
Carillo
Eagle (release tbd)

Bearings

Whatever your preference is for rebuilds. Mine is Clevite.

Headgasket

SCE gaskets

Valves

SI valves

Cams

PDM Racing
Nissan Motorsports
Colt Cams
Hybridka.com
JWT Technology

Solid Lifter Conversion Kit

Hybridka.com

Typical Injectors Used on SOHC

DSM (Eclipse/Talon/Laser) 450cc Injectors *Low Impedence*
RX-7 T2 550cc Injectors *High Impedence* Denso 195500-2020
RX7 FC NA Top feed 460cc Low *86-87*
RX7 FC NA Top feed 460cc High *88*
RX7 FC NA Top feed 460cc High *89-91*
RX7 FC turbo Top feed 550cc Low *86-87*
RX7 FC turbo Top feed 550cc High *88*
RX7 FC turbo Top feed 550cc High *89-91*
RX7 FC NA Top feed 680cc Low *84-85*
CA18DET 370cc Injectors *Low Impedence*

Injector Resistors (To alter low impedence to work with a high impedence ecu)

JWT Technology
JGS Precision
Last edited by veilside180sx on Fri Oct 26, 2007 9:47 pm, edited 12 times in total.
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JGS Precision
Wastegates, Bypass Valves, KA Turbo Kits
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Toyotech
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Post by Toyotech » Tue Aug 23, 2005 5:43 pm

This would be a great thread to refer people to when they ask a question like "do I have to buy _____ for only 250whp?"

STICKY???

veilside180sx
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Post by veilside180sx » Tue Aug 23, 2005 6:27 pm

That is precisely what it is for=)
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JGS Precision
Wastegates, Bypass Valves, KA Turbo Kits
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appleburger
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Post by appleburger » Wed Aug 24, 2005 6:22 am

awesome thread! i would suggest making the topic lines of the different sections bold so its easier to find what you're looking for at a glance. lots of great info!

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Post by HeelToe » Wed Aug 31, 2005 3:32 pm

I think this should be up in the Basic Turbo Tech cause a lot if not all of this applies to the DOHC users as well. Nice write up.

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tastyratz
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Post by tastyratz » Thu Sep 01, 2005 11:03 am

No love for the nizzx.com manifold? I picked this sweet baby up myself

Image

http://www.nizzx.com/ka24e%20mfld.asp


I know hes "shunned" here but to make a complete list of available manifolds Jordan Gladman Performance manifolds should also be atleast noted:

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www.gladmanperformance.com

sileighty
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Post by sileighty » Mon Sep 05, 2005 5:41 pm

nizzx.com isn't working.......how much was the mani?
With every project there should be at least some preparation.....

Nissan_Freek
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Post by Nissan_Freek » Mon Sep 05, 2005 7:45 pm

i thought i was the only one that got a bunch of html coding garbage on that website...

Jimmy

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Post by silencer.1 » Mon Sep 05, 2005 10:14 pm

Nissan_Freek wrote:i thought i was the only one that got a bunch of html coding garbage on that website...

Jimmy
It did that for me too when I used Mozilla Firefox to open it. Worked fine in Internet Explorer though.
Blue 1993 S13

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Post by Nissan_Freek » Tue Sep 06, 2005 9:06 pm

how much is the nizzx manifold?? i dont wanna email him...

jimmy

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Post by sileighty » Wed Sep 07, 2005 6:54 am

Ditto^
With every project there should be at least some preparation.....

veilside180sx
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Post by veilside180sx » Wed Sep 07, 2005 8:01 am

You have to email them because I couldn't find prices on their page.
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tastyratz
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Post by tastyratz » Fri Sep 09, 2005 2:59 pm

they dont give prices on the page you gotta email for them. I got mine on a summer sale and I *BELIEVE* it was 299+20 s&h but dont quote me. i think the prices change alot so your gonna have to contact them anyways. also I had a small wait for my manifold too but I think thats because I got it at a hot time and its a great mani. you really should see the thing its beautiful. note there was some casting flash on mine in the inside which is expected and 10 min with a dremel would really make this baby a beautey

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Post by MakotoS13 » Tue Nov 15, 2005 2:45 pm

why is gladman shunned? i just sent him payment for a manifold...
http://cgi.ebay.com/ebaymotors/ws/eBayI ... ESELX%3AIT

KA24ET kit for sale

nismo fpr and zeitronix wideband available too.

sileighty
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Post by sileighty » Tue Nov 15, 2005 6:17 pm

MakotoS13 wrote:why is gladman shunned? i just sent him payment for a manifold...
thats old he's back now..........suffice it to say it was some drama that is taken care of now........don't worry you'll get your mani, he's a good guy.... :)
With every project there should be at least some preparation.....

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Post by MakotoS13 » Tue Nov 15, 2005 6:26 pm

yay! that makes me happy on account of i really like his work. ROCK!
http://cgi.ebay.com/ebaymotors/ws/eBayI ... ESELX%3AIT

KA24ET kit for sale

nismo fpr and zeitronix wideband available too.

Masterdebater
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Post by Masterdebater » Mon Jan 23, 2006 9:28 pm

so how much exactly do u think it would cost for all the parts for the very mild tune. ive already got the t28 turbo with an internal wastegate so just an estimate for the cost of your mild setup.

ghettomateo777
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Post by ghettomateo777 » Thu Feb 23, 2006 6:05 pm

what's a mild build in your mind??
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Post by Scooby » Mon Mar 20, 2006 11:28 am

thanks for this thread!

i was just curious, i imagine the S15 480cc injectors will need the resistors as well? i happened to of found a set so i'll be hopping on those

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Post by exhaust_ed » Fri Aug 11, 2006 11:39 am

which manifold do you guys reccomend
1989 Nissan 240sx Ka24e
ICON 6 Spoke 17x7.5 on 215/45/R17 rear
ICON 6 Spoke 17x7 on 205/45/R17 front

MakotoS13
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Post by MakotoS13 » Sat Sep 30, 2006 10:29 pm

get a JGS kit and be done with it.
http://cgi.ebay.com/ebaymotors/ws/eBayI ... ESELX%3AIT

KA24ET kit for sale

nismo fpr and zeitronix wideband available too.

ROY
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Post by ROY » Tue Oct 24, 2006 2:13 pm

so... is an e-manage & SAFC2 necessary? Or is it pick one and be done with it?

MakotoS13
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Post by MakotoS13 » Tue Oct 24, 2006 3:03 pm

completely unecessary.

i don't have ANY computers other than the STOCK computer and i'm running a T3/T04E turbo with 550cc injectors.
http://cgi.ebay.com/ebaymotors/ws/eBayI ... ESELX%3AIT

KA24ET kit for sale

nismo fpr and zeitronix wideband available too.

ROY
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Post by ROY » Tue Oct 24, 2006 3:54 pm

MakotoS13 wrote:completely unecessary.

i don't have ANY computers other than the STOCK computer and i'm running a T3/T04E turbo with 550cc injectors.
You got your nifty chip though, right?

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Post by MakotoS13 » Tue Oct 24, 2006 7:04 pm

uh.... that would be the topic of conversation...
http://cgi.ebay.com/ebaymotors/ws/eBayI ... ESELX%3AIT

KA24ET kit for sale

nismo fpr and zeitronix wideband available too.

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Post by TipStylez » Tue Nov 07, 2006 3:09 am

Whats a "safe" PSI to be pushing on a stock SOHC with the midtune parts list running a t25 or t28? Say Atleast 200hp.
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Post by fromxtor » Tue Mar 27, 2007 9:23 am

Veilside, Here's another good pic of a SOHC or DOHC oil return bung placement to add to yours.
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^^ This is my pan.
-Josh

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'90 240sx HB- AMS GT32,JGS SOHC Starter kit,JGS plug wire shield,JGS MMs, Nismo tranny mount, Ross pistons, ARP H/Rs, Polished Rods, Port and Polished head,polished crank,greddy RS BOV,650cc injectors,ROM tuned ECU
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Post by JP240SX » Sat Mar 15, 2008 5:41 pm

TipStylez wrote:Whats a "safe" PSI to be pushing on a stock SOHC with the midtune parts list running a t25 or t28? Say Atleast 200hp.

This is what I was wondering too..

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Post by Jackasknissan » Fri Mar 21, 2008 11:57 pm

around 8-10 psi is as far is id dare push on a good tune, this was been posted too tho, check around
Turbo24sxt wrote:SOHC > DOHC ... period ...
oaznbeasto wrote: Hey 6 posts, Go **** yourself! learn something then post[/quote

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Post by bloodsport » Thu Apr 24, 2008 6:02 am

p.s. the fc turbo injectors are cheaper than the n/a injecters thru partsamerca.com 8)
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