Topic: Turbochargers

[st.chevrolet]

Is this book still out there? If so where can I find it?

Read my thread in Members Projects
Sean's Project YJ Turbo &..............  « 1 2 ... 12 13 »

[sharpxmen]

In his thread Air Sierra mention's he has an onboard engine analyzer and that the AFR is perfect through out the entire rpm range as far as rich/lean conditions. He also mentions trying different injectors but going back to the stock injectors.

hmm, if it's the OBD2/CAN interface then it is still limited to what the narrowband reports and off at wot - i looked around and the 2.4L seems to be still with a narrowband sensor. the on-board OBD2 analyzer is good for monitoring everything and the fuel trims in closed loop as far as i know, not sure what it does in open loop. do you have a link to that post?

[Vodkaman]

http://www.jeepforum.com/forum/f9/turbocharged-2-4l-my-tj-333749/ - this is his post. He ended up with bigger injectors. But how he did manage A/F ratio with stock MAP and 0.6 PSI boost, is a big question.

[sharpxmen]

http://www.jeepforum.com/forum/f9/turbocharged-2-4l-my-tj-333749/ - this is his post. He ended up with bigger injectors. But how he did manage A/F ratio with stock MAP and 0.6 PSI boost, is a big question.

yeah, i seen that but i was asking about the post regarding his on-board analyzer that Sean mentioned.

i just looked at the splitsec website to check their new pricing and found this http://www.splitsec.com/articles/JP1109.pdf - it's a YJ 4 banger turbo build

and this http://www.splitsec.com/technotes/Fuel-Engine_in_Boost_using_2-bar_Map_Sensor.pdf - it pretty much explains the 1bar stock vs 2bar and the way the split second operates, it's a good read if you have not seen it before

[Jeffy]

i just looked at the splitsec website to check their new pricing and found this http://www.splitsec.com/articles/JP1109.pdf - it's a YJ 4 banger turbo build

Hmm, I might have to talk to Pete. I thought he sold his 4banger.

[st.chevrolet]

hmm, if it's the OBD2/CAN interface then it is still limited to what the narrowband reports and off at wot - i looked around and the 2.4L seems to be still with a narrowband sensor. the on-board OBD2 analyzer is good for monitoring everything and the fuel trims in closed loop as far as i know, not sure what it does in open loop. do you have a link to that post?

Here's the post
Ya that would suck do you know what volts the o2 are reading???
Its a snap-on computer analyzer I bought it a couple of years ago to get my familys fleet of cars going I was tired of paying $250 to have something scanned.

mine show rich when on the gas like it should, Center at idle and, lean when off the gas just like it did before I installed the Turbo....I did hear that the fuel system is different between the years..don't know why they did that??

[st.chevrolet]

Here's the post on injectors
I bought 2 different injector sets to try to get the air/fuel mixture just perfect....I ended using the stock ones. The air/fuel is perfect through out the entire RPM ranger as far as rich/lean conditions.
I have a onboard computer analyzer to watch all the parameters to makes sure everything is OK. My air intake charge is around 65 degrees at any speed.

[sharpxmen]

Here's the post on injectors
I bought 2 different injector sets to try to get the air/fuel mixture just perfect....I ended using the stock ones. The air/fuel is perfect through out the entire RPM ranger as far as rich/lean conditions.
I have a onboard computer analyzer to watch all the parameters to makes sure everything is OK. My air intake charge is around 65 degrees at any speed.

he won't be able to tell what the mixture is with the stock O2 - whether is 8 or 14 AFR will still show as rich, but at least he knows he's not too lean.

i don't know about these 2 statements, can't really tell what the deal is
"..I ended using the stock ones"
"My air intake charge is around 65 degrees at any speed"

not really make sense for operating in boost unless his turbo seized - anyway, joke aside, this beats me - not sure how it works in his case and i am really the type that like to understand what's going on before stating an opinion, in this instance i can't

[st.chevrolet]

Here is a later post from 2010 about injectors he used.
Injectors P/N: 1W7EAA from Bruce at Five O Motor sports

Here's one from 2008
Well I have driven multiple 1600 miles trips in my jeep in 3-4 days plus I drive it 4-5 days a week myself plus I pull a 1,500 pound jeep trailer to and from trials now. and most of the time Its up mountain road pass's the go from 4,500' in elevation to 8,000' .........

I have 27,000 miles now on this conversion and it works so far with no problems...

[st.chevrolet]

Sharpxmen he mentions his analyzer in this post also from 2008.

I installed a sniffer that goes into the O2 bung on the exhaust and plug in a Drivable monitoring system.
I found it was running a bit lean so I changed injectors. Now it runs fine, timing is fine unless you over boost then the stock computer will not make enough adjustments for the boost.
If somebody could find a good shop to reprogram the stock Computer you could gain a ton more power. I was happy with the power increase, that I had gained. I also like how I was not over boosting the engine causing extra wear and tear on the motor.

[sharpxmen]

too bad he's not active anymore, would be interesting to see an actual dyno run (but that costs money so would be unlikely anyway).

[enginethatcould]

Read my thread in Members Projects
Sean's Project YJ Turbo &..............  « 1 2 ... 12 13 »

I just finished reading your entire thread after printing it....about to read it again with highlighter. Do you still have the drawing on the bracket? Also, I saw you were a fan of the pdf book on e-bay for a basic guideline, do you still have that as well?

TIA

[Vodkaman]

Here is one more site where Air Sierra is still active: http://www.reno4x4.com/forum/showthread.php/38135-Turbocharged-2.4L-for-me-TOO!!!!

[Jeffy]

I'm sure this was mentioned someplace but how much pressure can a YJ handle without having to resort to aftermarket systems (Split-second, etc...)?

[sharpxmen]

I'm sure this was mentioned someplace but how much pressure can a YJ handle without having to resort to aftermarket systems (Split-second, etc...)?

not really an answer to your question but it's not really worth the effort unless you run at least 5psi at which point you will need some sort of fuel management to compensate for the extra air.

there's some loss when you spin a turbo or a supercharger, so if you run low boost the difference in gain is less significant - imo not sure if it's worth it in that case.