onlyflash944

exactly how were you planning on getting everything back in? Good luck with that ----.

Rob the plumber

I don't know. I probably won't be able to. It would be a lot easier than removing the head though.

jpfrk2001

Bump for a good YJ turbo thread.

I am also about to start my turbo. Here is the link:
http://www.pirate4x4.com/forum/showthread.php?t=658004

Don't mean to hi-jack, but I will also need some guidence.

Rob, What engine / turbo you running?

Lookin good

wckdyj

Small update. Boost builds very quickly under more than half throttle. Also finally got my wideband in and it shows that I am a bit lean under WOT. Need to adjust the MAP sensor a bit more and get a new drain for the turbo. The one I have is leaking like a SOB under higher pressures.

Ohh, and I found out that the wastegate is set for 7psi.

No signs of detonation at all but like I said it is running a bit lean so I do need to add a bit more fuel.

Will update when necessary.

Chris

Rob the plumber

What are you seeing on the wideband at WOT? Are you still using the stock pump? And are you pulling any timing out under boost?

wckdyj

I am seeing about 15 or 16 max under WOT. I have the stock pump and I am not pulling any timing out, as I have not found a good way to pull the timing yet. I would really like to see the wideband rich under WOT. Around 12.

The pump may be whats holding me back, but I have not gotten that far yet.

Rob the plumber

15 or 16 to 1 @ WOT is way too lean. That is lean enough to burn a head gasket or a piston. That is even lean enough for it to misfire up top. I tuned all my supercharged Mustangs to about 11.8 to 1. I used a Walbro GSS340 pump in my Jeep. It is a high volume/high pressure pump. If your Jeep is TBI you should have lower fuel pressure than a multiport engine though, so you could not use that pump. I am sure they make a high volume pump for a lower pressure TBI system, or maybe add an inline pump.
I bought an MSD 6AL with BTM to pull timing. You can adjust it from the cab to pull 1-3 degrees of timing per pound of boost from the drivers seat. Great for hot days when you want to pull out a little more timing to be safe. You also get the benefit of the MSD box as well. It is basically a two wire installation. Very easy.

In my opinion, running boost without pulling timing and keeping the A/F ratio rich will definitely hurt your engine very soon.

wckdyj

15 -16 is lean but I would not go as far as to say that its WAY to lean. Like I said in my earlier post, I need more fuel and I would like to be seeing around 12 under WOT. That way I am not just wasting fuel.

What do you show on a wideband under WOT? With a walbro pump and a 12:1 FMU I would bet that alot of fuel is being needlessly wasted in your setup, but I would like to know for sure.

In regards to the timing, I agree with you that I need to pull some out while under boost, however I have not found a way that I like yet.

jpfrk2001

We talked about this earlier, but what about a Megasquirt. I know you don't like the idea, but when you get the cash, just plop down for a built unit with a base program already installed.

Im already thinking and planning for one. But Im not even out of the hole yet with my turbo project. I start mine today

Rob the plumber

A 2.5 with a T3.

Like I said, running an engine with cast pistons at WOT with a 15/16 to 1 air fuel ratio and no timing retard "should" blow up pretty quickly. But it's your Jeep. I have not put a wideband on mine yet. It would be nice if it were right around 11.5-12.0 to 1 though. Most engines will blow black smoke and misfire when the ratio gets too deep into the 10's, and mine seems to run very clean at the part throttle boost levels i've given it so far. I am not too concerned with wasting a little fuel under boost if it helps keep my engine together.
I am not even going to run mine at WOT until I get a wideband on it.