Progress Thread Diagnosis front end clunk (and more)

[JD1964]

I gave it a long overdue exterior wash yesterday. I’m going to daily it to work for the next couple of weeks. I have not had a good chance to pound on it yet because my local area is too congested during the times I’ve had it out. So far it’s behaving well in light suburban cruising and a little bit of rush hour traffic situations. I’m very happy so far.

 

[JD1964]

I did a 3rd gear WOT pull on the way to work. She definitely wants more gas. AF on the pull was 15.8. It wasnt that lean with the GT 40 irons. With them it was in the mid 13’s. Can a head swap make that much difference? Heads are the only thing that was changed. For the record, running NA at the time being

 

[AeroCoupe]

If you can get more air into the combustion chamber on the intake stroke then....

 

[JD1964]

I have an FMU on it now but it’s not connected to vacuum. It’s the Vortech FMU that came with the blower kit. Will that reference vacuum or only boost? If I can’t tweak with the FMU, will cranking up the FP do anything to help the WOT AF mixture?

 

[gkomo]

I have an FMU on it now but it’s not connected to vacuum. It’s the Vortech FMU that came with the blower kit. Will that reference vacuum or only boost? If I can’t tweak with the FMU, will cranking up the FP do anything to help the WOT AF mixture?

Pretty sure the FMU will only be doing something when it sees positive pressure (boost), it may create a slightly small restriction in the return line just being there. Someone double check my logic though i'm no expert... but i do run a FMU on my car.

 

[JD1964]

I gave the Kirban adjustable FPR three clockwise turns before leaving for work this morning. This is giving me 13.5ish AF WOT. I gave it one more clockwise turn after parking at work. I’ll do the test pull on the way home.

I can testify that 13.5ish made a noticeable difference in power increase from where it was before (16ish)

 

[Noobz347]

Pretty sure the FMU will only be doing something when it sees positive pressure (boost), it may create a slightly small restriction in the return line just being there. Someone double check my logic though i'm no expert... but i do run a FMU on my car.

This is correct unless the FMU is malfunctioning.

 

[JD1964]

Jury is in. 4 full clockwise turns on the regulator gives me 12.7 AF at WOT. It feels strong. I know it’s a bandaid but I’m going to keep it like this until I fine tune. I’m going to tune NA with Quarterhorse. This will be a learning experience. I figured tuning NA will be more forgiving to the learning curve. Once I’m familiar with it all, I’ll put the blower back in service an re-tune.

I might dyno it NA and then again after the blower is back online.

 

[Noobz347]

Jury is in. 4 full clockwise turns on the regulator gives me 12.7 AF at WOT. It feels strong. I know it’s a bandaid but I’m going to keep it like this until I fine tune. I’m going to tune NA with Quarterhorse. This will be a learning experience. I figured tuning NA will be more forgiving to the learning curve. Once I’m familiar with it all, I’ll put the blower back in service an re-tune.

I might dyno it NA and then again after the blower is back online.

Maybe not as much of a bandaid as you think. The EEC will now apply some trim to idle and part throttle.

Keep in mind that is now best to keep the EEC alive as much as possible. Re-learning will take some minutes of driving when the CAM dumps.

 

[JD1964]

Maybe not as much of a bandaid as you think. The EEC will now apply some trim to idle and part throttle.

Keep in mind that is now best to keep the EEC alive as much as possible. Re-learning will take some minutes of driving when the CAM dumps.

The EEC seems to be handling the idle and part throttle quite well even early in the game. Thing is I have a data sheet that came with the pro m MAF when I had it re-calibrated for 42lb’ers. So it should make it easier just punching all those flow numbers in and streamlining the fine tune.

I have other important projects that are always occupying my mind like freshening up a re-acquired 90 B2200

 

[JD1964]

Anyway, installing a good quality wideband is some of the best money I ever spent on car mods

 

[AeroCoupe]

Wait a minute…B2200 and no one went there???

 

[AeroCoupe]

Grew up in that whole fad and well was too broke to do one but always liked the whole hydraulic bed thing. The ones that spun blew my mind.

 

[JD1964]

Mine is stock except for a Weber carb swap and a header. 5 spd manual and a wopping 90hp

 

[Noobz347]

Needs a 302.

 

[nicholase]

And Daytons

 

[JD1964]

Needs a 302.

It’s been done.

Meanwhile, is simplistic beauty

 

[AeroCoupe]

I would say rotary swap it but they sound like ass.


View: https://youtu.be/FEt1goJgUu4?si=VZffExVOsSN2yYO2


Just keeping it ricey.

 

[JD1964]

I would say rotary swap it but they sound like ass.


View: https://youtu.be/FEt1goJgUu4?si=VZffExVOsSN2yYO2


Just keeping it ricey.

Yeah that’s pretty sick right there!

Actually the most common swap for the B trucks is the Kia FE3. Pulled from a 99-01 Sportage. Bolts right in basically since Kia bought the tooling from Mazda way back when. Takes you from 90 to 130hp.

Google Search

 

[nicholase]

I always thought the 2.2 turbo (F2T) from the first gen Probe would be a sweet swap for those. It's a Mazda motor and I believe would bolt right to the transmission on those trucks.

I always got I kick out of those motors. The little Ford emblem on the valve cover comes off with 2 screws and it says Mazda under it lol. Those things rip with a little wastgate massage.