Turbonator GLHS codebase

[ShelGame]

Odd. Why's it need that much space /chips?

Mike

It does't. It's just old. It uses 2 8k chips instead of a single 16k. 16k chips were expensive at one point in time, lol....

[zin]

LOL! They probably are still, now that no one makes them that small anymore!

Mike

[jckrieger]

Rob,

I think I'm likely to just run the map wires under the hood. This gets the map out of the way of the sockets in the LM so I can change the chips without pulling the board.

How much interest is there in a GLHS 3- or 4-bar MAP? IE, an On-board MAP? One of the things I've been toying with this winter is to build my own MAP sensors using Motorola internals and my own board inside a stock housing. I know Tom Spranger started to do that a while back, but I think he never made many.

[jckrieger]

Does anyone know how the transient enrichment tables work? I setup a cal for my GLHS with 72 lb injectors and the transient enrichment causes the car to misfire and puff black smoke out the tailpipe. Part throttle and full throttle tables seem to be working fine. I just burnt a version of this with a bunch of the transient enrichment tables cut back by 75% (50% reduction still seemed too rich).

If I figure out how to tune this out I'll post my results.

[jckrieger]

I disabled the transient enrichment and now the car runs great. I will use this as an opportunity to fine tune the part throttle and full throttle tables. I imagine at some point when I lean out the steady state fuel I'll see a reduction in performance without the transient enrichment.

[jckrieger]

I've resolved the issue with my transient enrichment. The THRTCN table is scaled in the wrong direction for larger injectors. The logic is backwards, increasing the table values DECREASES fueling, while reducing the values in the table INCREASES fueling.

[ShelGame]

I've resolved the issue with my transient enrichment. The THRTCN table is scaled in the wrong direction for larger injectors. The logic is backwards, increasing the table values DECREASES fueling, while reducing the values in the table INCREASES fueling.

It's actually not scaled at all for injectors. It's an averaging value, not a PW table. But, you're right; my wiki page description of it's effect is backwards. I'll fix that. I need to look into how the TPS transients affects fuel in the LM cals. It's different than the SMEC and later (the GLHS LM doesn't seem to have a PW table for the pump shot value, so I'm not sure how it's calculated).

[ShelGame]

Doh! There is a table and constant missing from the table file in the T/GLHS code. The PW table for the TPS transient fuel (which should be scaled for transient fuel). It's actually missing completely, which is why you get odd transient fuel behavior. I'll post an update very soon.

Thanks for your feedback, Clark - I probably never would have found this otherwise.

[ShelGame]

OK, template files are updated with the added table and constant.

Clark - You'll have to manually scale the PW table for your injectors (33/72).

[jckrieger]

OK, template files are updated with the added table and constant.

Clark - You'll have to manually scale the PW table for your injectors (33/72).

Rob,

Thanks for the quick feedback! I'll update to the latest template this weekend and scale the new table appropriately.

[ShelGame]

Most likely, the issues you were having was due to a 'phantom' table lookup. The way that table was called was by reference (not directly). Since the table and data weren't there, who knows what value it was pulling for the transient fuel PW. You probably were better off setting the THRTCN to zero.

Unfortunately for you, it also means you will probably have to re-do everything you got working on your transient fuel. But, I don't recommend not updating. The phantom lookup thing is not good.

[Aries_Turbo]

is this an issue in T-LM?

[ShelGame]

is this an issue in T-LM?

Nope. I checked. The transient fuel tables are there in T/LM.

[Aries_Turbo]

sweet. thanks

Brian

[jckrieger]

I tested the code and reset my transient tables back to stock. The car's transient enrichment works perfectly and everything is as good as stock. I've now wired the car for an under-hood 3 bar map and will be testing out the scaled cal.

One issue I've been having is a boost spike in 4th and 5th gear at WOT. Lower gears seem to hit the 13psi boost target fine, but I get a big spike at the higher boost levels. If anyone has any ideas, let me know. I've tried a couple different orifice sizes and it didn't seem to make any difference.

[ShelGame]

Maybe play with the RATLIM and RSFAC tables. They should help to keep spikes under control. I haven't played with them much myself as they're not in the newer cals. Maybe 5DIGITS can give some tips on how to tune those tables to control spikes...