Topic: Time to build it! Got a few questions

[sharpxmen]

dunno about that, they should be happy with a more efficient fuel system but that's not always the way things work

[dwtaylorpdx]

Yea, very little logic when it comes to emissions testing.

[chardrc]

tbi AMC 2.5l uses a flywheel sensor. no sensors in the distributor at all. just the rotor spinning away in there.

[sharpxmen]

tbi AMC 2.5l uses a flywheel sensor. no sensors in the distributor at all. just the rotor spinning away in there.

that makes sense as it doesn't need to know which cyl has the intake valve open (as compared to MPFI where the injector opening is timed with the intake valve).

[dwtaylorpdx]

Ah Musta been some other unit I saw with the dual sensor.. Nissan? who knows .. THats what I get for getting old and working on other peoples cars..

Might be cool to put a clifford 2 barrel manifold on and use the double barrel TBI ?? COurse its still a grand to do..

[chardrc]

well the Chevy tbi distributor has a sensor in it so your not totally crazy (don't know if it is a dual sensor or not). Chevy tbi has no crank sensors so they must be using it for both although as sharp said the tbi doesn't realy need to know which intake valve is open...

[sharpxmen]

4 lobes on the dist shaft (like it used to be with the points) would be the same as the 2 groups of 4 notches on the flywheel so really it doesn't matter if its in the distributor, on the cam or on the crank as long as it knows TDC for each 1/2 rotation of the crank will fire a spark and send it to the respective plug via the rotor in the distributor.

[Jeffy]

I'd like to see someone do something with a Holley Dominator EFI.  It's a computer that can control just about everything you would want or need.  It's not cheap but it does a hell of a lot in a nice package.  It will learn which is really nice so you're not SOL when you start it up for the first time.

For emission testing, they really wish they would just check for tail pipe emissions.  As long as your not leaking or diverting the exhaust elsewere, it shouldn't matter what you've done as long as the emissions don't change or better yet go down.

[chardrc]

If you are still looking for an intake air temperature sensor there is a lot of references / cross references for what sensor to use for the TBI 2.5l in the below link.

http://forums.4wdmechanix.com/topic/225-jeep-yj-wrangler-25l-tbi-troubleshooting/

[sharpxmen]

i looked at the '95 ohm chart and they are different by quite a bit, but just like the TBI they are the same for the same year (air temp values are the same as the coolant temp values). odd thing is that it looks like all the values are somewhere around 3.5 times higher on the new ones (not that you can really do anything with that info). I think you'll need to find some good ones at the j/y or old stock to make it work as it should unfortunately (or hopefully some store carries them still). I'll make a call tomorrow if i remember to Lordco (in Canada similar to what auto-zone is south of the border, don't think there's Lordco in the US but could be wrong), seems that they sometime have parts i cannot find online so who knows.

[bigal389]

I found similar info on the sensors. If I use the later model jeep sensors the ecu will think its about 60* cooler for both the air temp and coolant temp so after some more research I found this info on GM sensors on the mega squirt site.

Coolant temperature sensor (CLT)
GM #12146312
(may have been replaced by #15326386)
Standard TX3
GP SORENSEN TSU81
AC DELCO 213-928
NIEHOFF DR134AK
WELLS SU109 MSD 2310 (includes connector)

Air temperature sensor (IAT)
GM #25036751
Standard AX1
GP SORENSEN 779-19001
AC DELCO 213-190
NIEHOFF IGNITION TS83631 was DR-136W
WELLS SU107 MSD 2320 (includes connector)

GM Temperature Sensor Resistance

Degrees F - Degrees C - Ohms
-40º / -40 / 100,700
0º / -18 / 25,000
20º / -7 / 13,500
40º / 4 / 7,500
70º / 21 / 3,400
100º / 38 / 1,800
160º / 71 / 450
210º / 99 / 185

From what I have found these were used several years by Gm so I think I will just go that route.
Al

[sharpxmen]

well I called Lordco
they don't have any OEM, but they do have the coolant temp BWD WT5011 that I think chadrc posted, that is $40 (ripoff if you ask me but could not find it on Amazon so i don't have a comparison for it, the alternate GM one AC DELCO 213-928 is $15 at Amazon)

since chad posted the oem part number for the manifold air temp i asked them to look that up and it cross-referenced (according to their system) with Delphi TS10192, they don't have that in stock (and it could be that it is the same item as the OEM and is not available anymore) but the part number might help you out if you can find that one locally somewhere - i searched on amazon and is not available.

as a comparison they do have the GM one AC DELCO 213-190 for the same amount $40 like they have a set price for all sensors (this is the one you listed as a GM alternative for the air temp sensor) - available at Amazon for $20

[bigal389]

I did some research on the sensors this afternoon and Found that both can be ordered through Autozones website at $15.99 each for the Wells part #'s Su 107 & Su 109. I'm going to try ordering both and see what happens. I'll post the outcome once I get the sensors. I just don't see why something that is used by nearly every vehicle that has fuel injection can be so hard to find.
Al

[bigal389]

Ok I got the sensors finally. I got the water temp sensor from autozone and air temp sensor from Oriellys. Believe it or not Oriellys had the air temp sensor in stock. It's BWD wt382 a direct cross ref. to the wells 107. Now hopefully I can get this thing running this week end.
Al

[bigal389]

Sorry it's been so long since I have given an up date, things have been real hectic lately. Ok the engine is in and she runs oh so sweet. She has a lot more power than the old one I have taken her past 4k yet and that was merging on the interstate in third gear but she pulls a lot harder and I did have up to 80 mph up hill where the old one would barely do 70 on flat ground. I did get 5th gear back and it pulls Fairley well. It's no Porsche but I'm happy for now. I did use the tbi spacer that Sharp made and I got from Chardrc but I have had a chance to get the throttle body bore so i didn't use it. I did port match every thing. A few tips though, if you add a spacer on tbi you will have to lose the egr, if you use a Tj engine you will have to change motor mount brackets on the block or at least I did, I opted to run the v belt because I had just put a $140 alternator on it if you do this you will have to change water pumps due to the facts that v belt vs serp they rotate in opposite directions. Also I didn't us the new iat due the fact that I will have to drill and tap the intake to the next size and I was too lazy to take it back off so I put a used stock on in unti I remove the intake again.
Al