1991 Turbo 306 coupe MS3/PiMPxs tuning adventure

5.0Thunder

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Jan 31, 2018
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rotor phasing is something I've been harping on forever and people just don't want to listen.
 
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a91what

I plan to eventually problem is time
Mod Dude
Apr 6, 2011
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The tune and a snip of the datalog fields i used to review your tune. I have the AFR field in two seperate graphs for easy viewing. It looks like the Boost valve was not doing much, we never actually achieved out target. This however may be a blessing in disguise more boost = more danger at that AFR.

I actually tune my setup to 12.5 AFR in boost with wmeth [MAT is low}, but i would feel more comfortable at or below 12 AFR with your MAT temps.
WiseguyK datalog snip.PNG
 

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wiseguyk

Active Member
Sep 23, 2016
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Florida
I've been talking to Tony at Astro and figured I'd post what he and his builder's thoughts are on the transmission noise in case it might help someone else in the future:

Well, Gerry said he thinks that the 1st Gear is probably touching the 1st/2nd Shift Fork. Which when they are machined correctly, the gear doesn’t touch. But, the noise would only happen while in 1st Gear…not other gears. I can hear the noise really apparent in 1st Gear. That is why he thinks its that. Now, it doesn’t take many miles in 1st gear for the gear to “clearance” the fork…as the Steel Gear will win the battle vs. the cast aluminum fork it could touch. But, we don’t want that extra aluminum flake in the oil. But, I’m not 100% sure that it is 1st Gear touching fork. I would say that the G-Force Cases have shown to have issues with the 1st Gear touching the Case as the castings were a little thicker this last go around than previous….but, not under load. The gear thrust forward when loaded..which is away from the case. That’s why we don’t think its that.

Thankfully he said he'll be sending me a box with packing materials and a prepaid FedEx label to send it back to them.

Right now the plan is to go to the shop tomorrow (Thursday) and do a couple short drives with the latest and greatest tune file and collect some datalogs. Then pull the transmission out, drain it, and get ready to ship back to Astro.

Oh, and my buddy has a 2011 GT/CS and a new Borla cat-back kit that we might try to install if we have time :)
 

wiseguyk

Active Member
Sep 23, 2016
169
34
48
Florida
Hey guys, so I'm at the shop now and wanted to upload some logs real quick before switching gears to do my buddy's catback exhaust. We reset the timing once the engine was warmed up, setting to fixed at 20 deg and offset at 10 and got the balancer to read right at 20. Then went back to use table and went for a drive.

Looking at the logs real quick after we got back, it looks like the AFRs under boost were much better on this tune, all under 12 AFR in the points I checked. I've attached my latest tune (I only changed the EGO PID Proportional gain to 15 as suggested by Steve, and enabled VSS) and log file from the long drive to the gas station and short drive back to the shop.

The coolant temps went up to what I considered scary at like 225, so not sure why that is... We did add the metal upper rad pipe so is it possible there's an air bubble? I've never had that happen before but have heard that it could be a thing :p Anyway, thanks as always! On to exhaust now and then pulling the transmission.
 

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