Jeep Strokers

Reguardless of how you got it, it seems you have found a useable fuel curve. Home-grown inovation is always more gradifying than spending a bunch of money. I once had used a full throttle switch to get 5 volts to map rather than the regular 4.25 v (that I run with 30lbs injectors).Wide open with turbo @ 7 lbs , plenty of fuel. This was a full-race application though and I'm sure more tuning would be necessary for the street.

Dezertxj88 wrote:Well I can't personally explain what happens, how it happens, ect.
But the SAFC II has been working on my stock 4.0..it was tuned and that "tune" hasn't changed. If the PCM was adapting on the Renix then it would adapt and subtract or add fuel accordingly..as said my tune was set to go no richer than 13.2-13.6. If the ECU was adjusting why hasn't this changed?
I am monitoring with a AEM uego.
A: The RENIX ECU isn't adapting! So the SAFC II is useful! Around 45% throttle the SAFC II takes over and the tune that was set, is set and thats that! Under 45% throttle the normal ECU is controling the jeep. I know the basics, but couldn't go into detail of how it works or anything.

Its been controlling my jeep 4.0 just fine! We will see if it works with boost..idk if it will or won't! But it works wonders on my jeep 4.0.


My question, how would a adjustable map sensor offline be any different from a SAFC II. The SAFC II adjust the map voltage lol, its just alot nicer & has more options, and is more precise at adjusting fuel!

amcinstaller wrote:megasquirt works with a turbo. look at the flogging the wee wee thread. turbo 4.0 (not stroker) build thread

thanks for the post, but i dont think it will help me. Once you stroke the 4.0 it will throw off any tuning you did for the stock 4.0, BUT the megasquirt is a good idea. Whats that run about 400 bucks?

What i will probably end up doing is just going directly to my machinst and picking his brain on the subject. He likes to play, so hopefully he will go for the idea.

now about that home grown deal???

racing89 wrote:Reguardless of how you got it, it seems you have found a useable fuel curve. Home-grown inovation is always more gradifying than spending a bunch of money. I once had used a full throttle switch to get 5 volts to map rather than the regular 4.25 v (that I run with 30lbs injectors).Wide open with turbo @ 7 lbs , plenty of fuel. This was a full-race application though and I'm sure more tuning would be necessary for the street.

Dezertxj88 wrote:Well I can't personally explain what happens, how it happens, ect.
But the SAFC II has been working on my stock 4.0..it was tuned and that "tune" hasn't changed. If the PCM was adapting on the Renix then it would adapt and subtract or add fuel accordingly..as said my tune was set to go no richer than 13.2-13.6. If the ECU was adjusting why hasn't this changed?
I am monitoring with a AEM uego.
A: The RENIX ECU isn't adapting! So the SAFC II is useful! Around 45% throttle the SAFC II takes over and the tune that was set, is set and thats that! Under 45% throttle the normal ECU is controling the jeep. I know the basics, but couldn't go into detail of how it works or anything.

Its been controlling my jeep 4.0 just fine! We will see if it works with boost..idk if it will or won't! But it works wonders on my jeep 4.0.


My question, how would a adjustable map sensor offline be any different from a SAFC II. The SAFC II adjust the map voltage lol, its just alot nicer & has more options, and is more precise at adjusting fuel!

I now understand after re-reading what Silver was saying.. Sorry Silver.
I CANNOT confirm the SAFC II will work with the turbo yet! I can only confirm that it works on a N/A jeep. I misinterpreted what Silver as "It won't work period" And I responded basically saying "It does work" lol..He was saying "It won't work in a boosted application". I guess I'll know soon enough, currently idk if it does or doesn't.

I know Pepperson on cherokeeforum is running a HKS AFC which is very similar to the SAFC II. And hes tuned his turboed jeep 4.0 on 8psi. Hes been running it for about 1 month or so. So we will see if anything happens with his setup, he also has no map clanmp or anything, just the HKS AFC. But thats all the info I have on using one in a boosted application.


Edit: I'll be honest and say this much. I plan to run 6psi to start off with, compression being 9.2:1 final, .035 quench..I also plan to advance my timing 6*, using my CPS-by cutting and modding it to move it as far left (advance) as possible..Which is 6* advanced. It'll run on 91 octane & later down the road 91 + meth injection. I have an 88, so if anything it'll knock and pull that timing back out..no biggy.
I'm truely hoping to get 8psi & my timing advanced on 91 + meth.

You won't be able to run 6 degree timing advance with boost. You will need to retard the timing 1-2 degrees per pound of boost.

Dezertxj88 wrote:I now understand after re-reading what Silver was saying.. Sorry Silver.
I CANNOT confirm the SAFC II will work with the turbo yet! I can only confirm that it works on a N/A jeep. I misinterpreted what Silver as "It won't work period" And I responded basically saying "It does work" lol..He was saying "It won't work in a boosted application". I guess I'll know soon enough, currently idk if it does or doesn't.

I know it works on a N/A Jeep PCM at open loop as I had one. It worked fine for years but I wanted something that had more points to change, timing retard, data logging, vacuum/boost input, etc.

SilverXJ wrote:

Dezertxj88 wrote:I now understand after re-reading what Silver was saying.. Sorry Silver.
I CANNOT confirm the SAFC II will work with the turbo yet! I can only confirm that it works on a N/A jeep. I misinterpreted what Silver as "It won't work period" And I responded basically saying "It does work" lol..He was saying "It won't work in a boosted application". I guess I'll know soon enough, currently idk if it does or doesn't.

I know it works on a N/A Jeep PCM at open loop as I had one. It worked fine for years but I wanted something that had more points to change, timing retard, data logging, vacuum/boost input, etc.

Ya sorry bud, Idk why but I read it as it won't work. It makes since what you were saying about it not working in a boosted app..If it doesn't them I'll be buying & using something else. Sorry for the misinformation and misunderstanding!

You need a piggyback/map adjuster that has at least a built-in 2-bar map sensor. As Silver has repeated: stock jeep map sensors can not read boost, so will not be able recognize the fueling needs from >0-10 psi. The Split Second PSC1-002(Programmable Signal(MAP) Calibrator, no timing adjustment) will work, certain FTCs will work(Fuel&Timing Calibrator; only retards timing), and the AEM FIC(Fuel/Ignition(timing) Controller) will work. Others will work, just make sure it has at least a 2-bar built-in map.

thanks gradon, that really clears things up for me.

please do continue. . .

http://compare.ebay.com/like/1807825878 ... si=y&cbt=y

found this on ebay, check it out.
the plugs are the same at least and its rated at 2 BAR.

here is another option, but i cant find a price??
http://www.splitsec.com/products/psc1/PSC1002.htm

http://www.splitsec.com/products/fuel-t ... brator.htm

and another, although i dont know if this one is still avaliable

at first I was really excited about doing a turbo, and then after learning about what it requires to tune i got really discouraged, but now my fire has been renewed. The only thing standing in my way is the tuning, but that will come with time a patience.

http://www.ebay.com/itm/T3-T4-57-A-R-TU ... es&vxp=mtr

^turbo

http://www.ebay.com/itm/28x7x2-5-FMIC-T ... es&vxp=mtr

^intercooler, measurements will work

http://www.ebay.com/itm/Turbo-Boost-Vac ... es&vxp=mtr

^boost gauge, dont know much about the brand

http://compare.ebay.com/like/1807825878 ... si=y&cbt=y

^map sensor for boosted application



what do you think? i will have to buy and weld on a turbo flange onto my header, and customize the plumbing, but i have high hopes. For everything above it will less than 200. I can hear the whistle now. . .

What the hell are you going to do with the 2 Bar Map sensor?

Turbo looks a bit on the small size and of low quality.

What are you doing about fuel?

Please don't use a Chinese turbo.

so nothing, back to square one
shows what i know, still learning here

but what about the computer(s) in the earlier poster?
thanks, i guess

Honestly no issue running those chinese turbos, its not the best but its been used on a few jeep builds already..also on many other na-t setups for cars.

Try to find a ford diesel turbo..good quality and a good size.