Hey guys,
I was wondering if anyone else has issues on E85 with warm starts on RCs.
I have 1200 and my cold start is fine but for warm starts, I have to crank it a few times to get it to start. Really annoying and I'm afraid that I'll ruin my starter.

Coolant Temp - MS
-32 - 275.3
-18 - 190.1
-8 - 120.1
7 - 75.3
20 - 42.4
34 - 35.4
50 - 33.7
77 - 27.0
82 - 20.0

Please let me know.

Thanks
Reggie

 

Your warm cranking enrichment is really high?

I run PTE 1200cc and this is what my cranking primer inital pulse table looks like
352.408
206.488
131
79.104
44
8.096
4.4
3.6
3.6

So between us the really cold stuff in realism land between 7 and 20 C is about the same but my warm starts are way different than yours.

 

we started from 0 in the last 4 - 5 cells, and increased, but increasing does nothing. But we did start at 0

 

I'm helping Reggie tune his car. We started with 0's in the last 4-5 cells and started adding more and more fuel to those cells but it didn't seem to help. He had the same problem when he was running gasoline 91 octane and a tune. The car just has a harder time cranking it seems with the RC 1200's. Any suggestions to get it to start easier?

 

You have a wideband to check up on what happens when it starts? You could just be flooding the chamber even at 0.

I'll post up my battery latencies for the PTE's maybe the voltage drop when its warm starting is causing your issues.

Latency:
5.184
2.952
1.752
1.056
0.744
0.528
0.312

Scaling:
713

 

I'm almost certain the wideband is flipping out during startup because it doesn't have enough volts to run it. But I'll check it out the next time I see Reggie and see if we can get a wideband reading. Thanks for the suggestion. Can we actually go negative in those cells? BTW we still have our Natomas meets every friday, been going on a few years strong. Come on by if you can!

 

Nope they are just boosters so you can't go negetive

 

I have rc1200s and dont have any issues with warm starts. My issue is actually partially cool starts, i have to crank it for a couple seconds till it starts. Ill post my table later

 

Warm starts kill me! Having the same problem here but with PTE1200s. I ran E85 all winter long never had a problem with cold starts but as soon as the car has been running for awhile it takes some time to get it to start up again.

 

Try starting the car with your throttle half way open. If it starts easier, quicker, or on the first try, then it's getting too much fuel. Adjust your cranking IPW in the coolant temp range where you are having issues to much lower numbers.

 

can you post your crank numbers please?

 

We've had those numbers 0'ed when car was warm and it was hard to crank. I told reggie to try holding the throttle down though. Will probably try it in a few.

 

Keep in mind that there are several other IPW tables that should also be scaled down based on the new injector size. Perhaps a couple of those other tables are part of the issue as well. I think mrfred's advanced fuel control should have everything you need. But the gas pedal trick is a good test to see if you are getting too much fuel.

 

so update on this
i've been decreasing the numbers and yes its making a difference. its not perfect yet but i think a little bit more trial and error should get me very close.

 

I have this problem as well.

I have tweaked the various IPW tables to get a better warm start only to find that those setting change a lot with changes in the weather.

On a related side note, when was the last time you changed your front O2 sensor? Mine needs replacement. On engine start, often the ECU will run rich or lean until the front O2 heats up. Which way the trim wanders depends on the previous fuel trims stored in the ECU. I think this is affecting my warm starts as well, which is why I mention it here.