My SOHC Turbo Build

[RUHNAy]

I just did my compression results in i read that the dohc comp # need to be over 155 but is it the same for the sohc???????? Results=150 149 150 147 wat do u guys think turbo or rebuild?

[neverlift]

you could just do the bearings/rings and call it a day, obviously you need to get some cross hatch going on, so account for that.

was this warm and what was the wet results?

[nelson8708]

sohc ka engines have lower compression so your numbers look high if anything (carbon build up). When i comp. test my ka24e i had 145-143 across the board after i rebuilt it.

[Patarach]

FSM spec for the sohc is 142-192 max, difference limit between cylinders is 14psi.

Your in spec and it looks like they are wearing evenly.

It would probably turbo fine, but watch it carefully and don't try to overdo it.

How many miles does the engine have on it?


Modified by Patarach at 8:12 PM 10/19/2009

[RUHNAy]

Thethe engine has about 108,XXX really clean twooo fowty my buddt in his sr20 envies me for it lol ...

Sorry for asking buy im a new what do u mean by wet nd dry?

Really u got those numbrs after the rebuild ?? Soo im guessing nu engine is in pretty good shape huv.......

Thanks fot the help guys any ideals on a turbo size for 300 hp goals? I was thinking about qoing with the jgs manifold o read all but bad reviews about it

[RUHNAy]

Thethe engine has about 108,XXX really clean twooo fowty my buddt in his sr20 envies me for it lol ...

Sorry for asking buy im a new what do u mean by wet nd dry?

Really u got those numbrs after the rebuild ?? Soo im guessing nu engine is in pretty good shape huv.......

Thanks fot the help guys any ideals on a turbo size for 300 hp goals? I was thinking about qoing with the jgs manifold o read all but bad reviews about it

[RUHNAy]

Thethe engine has about 108,XXX really clean twooo fowty my buddt in his sr20 envies me for it lol ...

Sorry for asking buy im a new what do u mean by wet nd dry?

Really u got those numbrs after the rebuild ?? Soo im guessing nu engine is in pretty good shape huv.......

Thanks fot the help guys any ideals on a turbo size for 300 hp goals? I was thinking about qoing with the jgs manifold o read all but bad reviews about it

[RUHNAy]

Thethe engine has about 108,XXX really clean twooo fowty my buddt in his sr20 envies me for it lol ...

Sorry for asking buy im a new what do u mean by wet nd dry?

Really u got those numbrs after the rebuild ?? Soo im guessing nu engine is in pretty good shape huv.......

Thanks fot the help guys any ideals on a turbo size for 300 hp goals? I was thinking about qoing with the jgs manifold o read all but bad reviews about it

[neverlift]

some sohc had low compression(almost like nissan was thinking of boost) I think it was 8.6:1, any rate the cylinders are all close in relation to one another, boost it

wet is when you add a capful of oil to see if your rings are bad, warm is when the motor is fully warm.

My car wakes up at 19.5ish vac and after a little abuse it goes up to 21 at idle. Probably go up to a solid 22 if temps went over 190*. But my compression was 212 across

[RUHNAy]

holly s*** 212??? thats a really high number bro ill prob be doing my final shopping this week to start my bby up

ahh the love of boosting i remeber when i had my first 240 with a sr20det omg parts here in az wer literly impossible to find luckly i can find the sohc parts like nothing what doo you guys think will be a safe boost 10psi?? lower ?? higher???

[Chris28]

Depends on the size of the turbo. Since you have an sohc you are going t3/t4, so 10 lbs will be a lot of fun power. You can go higher if you want, it's all in the tune.

What are your power goals?

[RUHNAy]

pw prob like hi end 200s or early 300s

[Chris28]

Garrett T3 Super 60 with a 60 AR. 810cc injectors. Z32 MAF. 10 lbs of boost.

Quick spooling fun capable of over 300 hp.

[RUHNAy]

u dont think 10lbs is pushing it with my comp #'s ???and will the jgs manifold be compatable with the t3 super 60?

also i was wondering what type of ballpark numbers im looking at for an install at a shop i would do the install myself but im a new with this and patience and time is not a big factor with me....? ideas ?

[neverlift]

yeah I was impressed myself, not sure the motor is not built, but 150 bux I doubt it. I know its taken some lean action on boost. But no oiling of the vc or pcv so its not seen any real damage. This is a dohc I'm speaking of, which have higher comp than a sohc of either ratio.

what year sohc do you have, IIRC the early sohc had boost friendly comp.

Goals and use are important if you want us to help with those questions.

You could do 8psi with a 6:1 fmu/walbro/timing retard(probably not being a sohc) but top feed injectors are cheap enough you could do much more cheaper. And the tuning is caek.

kat= good tune or go home broke.

[RUHNAy]

yeah I was impressed myself, not sure the motor is not built, but 150 bux I doubt it. I know its taken some lean action on boost. But no oiling of the vc or pcv so its not seen any real damage. This is a dohc I'm speaking of, which have higher comp than a sohc of either ratio.

what year sohc do you have, IIRC the early sohc had boost friendly comp.

Goals and use are important if you want us to help with those questions.

You could do 8psi with a 6:1 fmu/walbro/timing retard(probably not being a sohc) but top feed injectors are cheap enough you could do much more cheaper. And the tuning is caek.

kat= good tune or go home broke.

its a 1989 single cam banger ...its totally stock with 108'xxx miles my goals are high 200s or low end 300s its gona be my daily driver more then likely atleast kuz i know once i drive the two fowty im not even gona touch my maxima lol..yeah i know alot of ppl keep telling me to not go cheap on tunning thats its a must i was prob gonna go with an enthalpy tune...

[Chris28]

Hmm, I mean your compression numbers are within spec and are close to each other, I wouldn't really worry about it. Slap the turbo kit on there and call it a day. The JGS kit is compatible with the T3 Super 60.

Also look into EFI Specialist. I have one of his tunes for the DOHC and it's great. As long as your tune is on you shouldn't really have to worry about anything. Maybe add a Buick GNX PCV valve inline with your current pvc system just to make sure you don't get boost into your crank case.

Whatever you do get a wideband O2 sensor/gauge. It will tell you what is going on inside of your engine.

[RUHNAy]

tha

Hmm, I mean your compression numbers are within spec and are close to each other, I wouldn't really worry about it. Slap the turbo kit on there and call it a day. The JGS kit is compatible with the T3 Super 60.

Also look into EFI Specialist. I have one of his tunes for the DOHC and it's great. As long as your tune is on you shouldn't really have to worry about anything. Maybe add a Buick GNX PCV valve inline with your current pvc system just to make sure you don't get boost into your crank case.

Whatever you do get a wideband O2 sensor/gauge. It will tell you what is going on inside of your engine.

thanks for the info chris otherwise i just scratched my head and called it a day

[Patarach]

Maybe add a Buick GNX PCV valve inline with your current pvc system just to make sure you don't get boost into your crank case..

Wouldn't it be so much easier to just hook up pcv in from of the turbo behind the maf, all pcv recirculation is used for is to reduce emissions anyways.

And I ran 7psi on a t3 60 trim with 5 degrees of retard and a 8:1 fmu for almost 2 years on a stock kade with 130xxx miles, no engine problems what so ever that were boost related. Just make sure you back off the timing enough, and the fmu works great.

[neverlift]

Wouldn't it be so much easier to just hook up pcv in from of the turbo behind the maf, all pcv recirculation is used for is to reduce emissions anyways.

And I ran 7psi on a t3 60 trim with 5 degrees of retard and a 8:1 fmu for almost 2 years on a stock kade with 130xxx miles, no engine problems what so ever that were boost related. Just make sure you back off the timing enough, and the fmu works great.

not true, proper crank evac can gain power.

see you already know what to do not sure how top feeds hold up to the pressure of an fmu, however I would run a 5:1 and get an adjustable fpr to "fine tune" with a wideband. I have a 7:1 installed and it runs a bit rich still.

IF you go fmu get a btm and leave timing stock(boost timing master) this lets you retard only on boost and is adjustable in cabin. Let wd chime in.. An fmu and btm is great to about 8psi(depending on the ratio) ,had mine running to ten psi till a few days ago And if you shop around can be cheaper than a tuned ecu. But its limited to what you feel is safe on the fuel system.

enthalpy I dont recall being bad, but I am way out of that loop, if you think you can DIY tune? sohc ecus are the s***, for a hundred bux you could be set, for more you could do realtime ... hybridka rom tuning forum.

no dynos but my dohc at 6ish psi probably make 200 to the wheels. A local guy ran 8:1 at 12psi and made 320whp and had dyno sheets to back it.

[WDRacing]

With the MSD BTM you can probably run 10-14 psi if you don't mind running a ton of fuel pressure. You'll need to make sure your fuel pump can keep up with the demand though, that and high fuel pressure scares people.

I'm crazier then most, so I'd watch my fuel pressure and keep adding boost until the pump had trouble keeping up, then run just under that for my high setting and like 8 psi for my low setting.

The BTM is key though, without timing retard you're screwed.

6:1 FMU + MSD BTM + 12 psi = 300whp for cheap $$.

[neverlift]

/\love that guy any updates on the you know

[WDRacing]

Nah...not for a little while. If you know the theory behind the hacked MAF then you can do something similar to your S13 MAF. Rather then cutting out the sensor and installing it into a larger housing you can just have a certain amount of air bypass the MAF via a seperate tube. Picture a Y pipe with the MAF on one side and just a filter on the other. The result should be the same, unmetered air enters the motor compensating for the xtra fuel. Tweaking the base fuel pressure will help gets things just right.

Doing this does change the timing maps though, just like using a SAFC. So you'll need to worry about timing retard even more so then with a FMU. In the end the FMU really is the best cheap way to add fuel. If I go the FMU route we'll know for sure just how far you can push it

WD

[neverlift]

on my 7:1 with 37psi base fuel pressure I was doing 9psi daily for 2 weeks. Its seen 10~11 I didnt notice any loss in fueling on the wideband gauge. However that was directly out of the turbine(now moved about a foot down stream).

I could easily see a 5:1 and an afpr going to 20 psi of boost with the right pump, not sure a walbro would keep up, I made mine hit 120~130 with the line pinch trick. I'd assume that 110 would be about where you stop seeing a gain and it start to really peter out d/d 10psi on 75psi base pressure stock everything but timing retard, for a week or so. man I tinker too much

get to pushing and do up that uber sweet super secret boost bottle soup can thingy

[RUHNAy]

quick question i have a 1996 q45 laying around can i use those injectors???

[Patarach]

aren't q45's side feed? (that should answer your question)

I also wanted to post this up here considering this thread is beginning to be about fmu's but I did not think it was new thread worthy, walbro pump flow rates at psi. fOund it on some miata site



So I guess your going to have to find the sweet spot when adjusting fuel pressure to have the pump still flow enough fuel, or just run a fuel pump that flows more than a walbro.

Good year Fuel injection line (the best I can get at local jobbers) is also rated at 100psi max, but 900psi burst, I know there is better line out there though.

I'm really thinking about going with you guys on the >8psi fmu thing, Ive been using a chipped ecu but it runs like crud, I have a feeling it has something to do with my tps but I really don't know (was an automatic).

Either that or a u12
Modified by Patarach at 7:49 PM 10/22/2009

[RUHNAy]

soo i just bought my manifold off ebay its a jordan gladmans performance side mount manifold for my ka just one step closer to boosting it was super cheap for the quality i payed 234.00 with shipping to az! hope on it guys!

edit; could someone rename this thread to my build or something

[WDRacing]

edit; could someone rename this thread to my build or something

Better?

[neverlift]

that t3 flanged?

hurry up and let me see some fitment. I want to get away from my bmc, I have not lost brakes in this chassis(all the same s*** from my old car down to the bmc) ,but fear that they could fail me in a heated drift session.

[RUHNAy]

yes it it !

that t3 flanged?

hurry up and let me see some fitment. I want to get away from my bmc, I have not lost brakes in this chassis(all the same s*** from my old car down to the bmc) ,but fear that they could fail me in a heated drift session.