Olds 358 build

[olds307 and 403]

Well, I still have a minor leak at the back rail, tightened it more, don't want it any tighter. One of the rails got a bit of a ding in shipping from Mark. Hopefully it sealed up this time. I may pull it and put in a new O ring or different fitting. But it ran and drove across town, that is something.

 

[olds307 and 403]

Fuel leak is fixed, apparently an O ring is handy to seal the fuel rail. Well, I got my Ford TPS for the Speedmaster throttle body. It works, sort of. It has less of a lag in the throttle but only gets 60 percent TPS, no matter how I adjust it, including slotting the TPS mounting holes. The sensor goes to nearly 100 percent, just not with the throttle arm sweep. The US made Edelbrock 4 barrel includes and uses a Delphi GM LT1 TPS and GM IAC, whether it is the LS or earlier style, I have both on hand. It has good reviews and is available and cheaper than the Chinese Holley throttle body and not waiting on ships from China and currently on backorder. The only way I will buy another Speedmaster product is if someone like Mark goes through them, talking their cylinder heads, still holding out hope for the small chamber Edelbrock heads.

 

[olds307 and 403]

Well, I think this Speedmaster throttle body is BS. So I got a BMW TPS sensor. The 8mm D head fits the shaft perfectly bolts in the stock holes but the 122 degree sweep isn't enough. To get 0% at idle, it puts it at 70% WOT. For 100% WOT, at 26%. Looks like I am buying the Edelbrock throttle body tomorrow.

 

[olds307 and 403]

Well, I forgot to do something important. Yeah, the TPS Wizard reset fixed it! Don't know why I didn't try it last night, used to nothing but road blocks on this build, I guess. 0 to 100% and instant TPS movement. This sensor is available cheap on Amazon from multiple sellers, so I will pick up an extra along with an extra LS IAC sensor to keep in the car.

 

[Ernest]

For you oldsmobile lovers... the W-31 special, dynoed at "nick's garage".

 

[olds307 and 403]

Here is another one, betting 8 to 1 with maybe a stock or the 204/214 cam. It would be fun with 87 octane with a ton of part throttle timing. Iron headed Olds V8 like a lot of timing, these motors prove it.

 

[olds307 and 403]

Well this thing has fought me tooth and nail but is now running and driving! I changed the oil to 10W30 VR1 with 1 liter of 20W50 for good measure. I start it and the belt started walking on the pulley! I guess it started wobbling and almost ate the belt. Apparently the bearing was going out on the Dorman A/C delete pulley. It is a touch higher than the target idle has Zero IAC and TPS. Talking 850 in gear and 950 in park, running better the more I drove it. Would like to thank Mark Remmel has helped me out as usual and I am sure I will be bothering him more to get the tune spot on.

 

[olds307 and 403]

Well, I have been running the base Holley Terminator X Max tune with much more timing and the IAC at 8 rather than 40 percent. The TPS works flawlessly but goes massively lean on tip in and stalls when cold from stop signs. I am getting Cutlassefi to do a custom tune with better less generic parameters along with enabling the knock sensors. I also ordered the actual Holley to Terminator X Max laptop cable to properly tune this SEFI Olds 358.

 

[olds307 and 403]

Well, Mark sent me one of his tunes, definitely made it better. I finally got my tune loaded on a SD card to enail to him. Funny how a day off and new SD card, everything goes smoother. I also figured out where to load his tunes in the Holley files. Doimg sh*t after work never goes well. Loaded the revised tune from Mark, since he could finally look at my current tune. Hooked up my 300 psi gauge, showed 50+ psi, the little numbers are hard to tell, goes up in 10 psi. I started it, idle almost instantly went to where it should. Before it would either stall or struggle to idle above 500 or 600 rpm, I have it set at 850. I put it in gear and it didn't stall! My garage is downhill so it is under instant load. Will see how it runs and how steady the fuel pressure is driving.

 

[olds307 and 403]

So I needed to crack the throttle blades, was getting 100 percent IAC, hot in gear. Just opening it hair, 2% percent on the TPS brought it down to zero to 8% where it should be. Part throttle seemed stronger, IAC readings are are about half. Before the TPS reset it was idling around 1000 rpm, after the reset around 950, which I'm fine with. Will see if it idles better on cold start and if the off idle lean condition has improved tomorrow. Mark sent me an updated tune, will see how it works cold in the morning