SOHC Turbo Build For Dummies
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- SuperMod
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SOHC Turbo Build For Dummies
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)
Boost gauge
Here's lists of aftermarket products that are currently on the market
Turbo Build Parts
Turbo Manifold (Exhaust Manifold)
JGS Precision
Realnissan.com
Import-AutoPerformance.com
Nizzx.com
BOV
Tial
Greddy RS
JGS
HKS SSQV
Wastegates
Tial
JGS
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
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)
Boost gauge
Here's lists of aftermarket products that are currently on the market
Turbo Build Parts
Turbo Manifold (Exhaust Manifold)
JGS Precision
Realnissan.com
Import-AutoPerformance.com
Nizzx.com
BOV
Tial
Greddy RS
JGS
HKS SSQV
Wastegates
Tial
JGS
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.
JGS Precision
Wastegates, Bypass Valves, KA Turbo Kits
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- SuperMod
- Posts: 1948
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- Location: PDX Metro
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- 240sx Wannabe
- Posts: 173
- Joined: Tue Sep 14, 2004 3:03 pm
No love for the nizzx.com manifold? I picked this sweet baby up myself
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:
www.gladmanperformance.com
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:
www.gladmanperformance.com
-
- Knows Some Stuff About 240's!
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- Dreams of owning a 240!
- Posts: 52
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- Knows Some Stuff About 240's!
- Posts: 398
- Joined: Wed Sep 01, 2004 11:42 pm
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- SuperMod
- Posts: 1948
- Joined: Mon Sep 20, 2004 2:13 am
- Location: PDX Metro
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
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.
KA24ET kit for sale
nismo fpr and zeitronix wideband available too.
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- Driving Mom's Station Wagon
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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....MakotoS13 wrote:why is gladman shunned? i just sent him payment for a manifold...
With every project there should be at least some preparation.....
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.
KA24ET kit for sale
nismo fpr and zeitronix wideband available too.
-
- Learners Permit
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- Driving Mom's Station Wagon
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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.
KA24ET kit for sale
nismo fpr and zeitronix wideband available too.
completely unecessary.
i don't have ANY computers other than the STOCK computer and i'm running a T3/T04E turbo with 550cc injectors.
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.
KA24ET kit for sale
nismo fpr and zeitronix wideband available too.
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.
KA24ET kit for sale
nismo fpr and zeitronix wideband available too.
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Veilside, Here's another good pic of a SOHC or DOHC oil return bung placement to add to yours.
^^ This is my pan.
^^ This is my pan.
-Josh
'04 Titan SE CC -DD
'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
'04 Titan SE CC -DD
'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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