Techsalvager

How many others still have this issue even with altered MAT corrections?
restart couple minutes later and see AFR lean out till you start get going enough.

aaronc7

iTrader: (8)

yep. would be really nice to have an idle specific MAT correction table that would taper off with rpm... my understanding is MS1 has this, but not anything since then.

Techsalvager

The question is not about the MAT correction, its about the hot restarts.
I would say though phase in MAT correction over a certain time from restart.

Braineack

iTrader: (62)

Not enough to care about. I can run the car pretty damn lean on seq. fuel.

Techsalvager

not a question of caring its a question does it still happen to whoever.

FatKao

Restarting my car is a train wreck after I get off track.

Martin Y

Hot starts are the bane of my life. I find the only way to get going is to crank for several seconds then blip the throttle as I release the key. If I don't do that then it might sometimes fire up but will then stumble along at 400-500 rpm until I blip the throttle. I've tried alternately increasing and decreasing the cranking pulsewidth by 10% or even 20% but neither seemed to improve.

I stopped to fill up today and it took me three tries to get started. Embarrassing with a queue at the pump.

Techsalvager

fatkao can you expand on that.

MartinY thow your tune up and a datalog if you have one at the time it happens

FatKao

I see intake temps around 140F from heat soaked everything after the car sits for 30m-1hr after a session. The last event I did the ran 2 out of 3 run groups and the restart after the 30 minute pause was never pretty. Usually have to keep the throttle open a bit and the RPMs at 2-3k for 30s-45s to give the intake tract a chance to cool down a bit before the idle is stable.

One thing I need to do is move the sensor so it's not on the same side of the intake tubing as the radiator, currently it's about 4" off the throttle body coming out the drivers side. Another thing I need to do is switch to a metal intake pipe vs the plastic I have now.

Techsalvager

what EMS fatkao if its MS can you upload a tune and datalog?

FatKao

MS3, I'll see if I can find a datalog of it happening. Not sure if I logged it. Today I had the car dyno'd and my MAT was 120F after sitting ~20 minutes after 2 pulls. It wasn't very happy restarting but with some throttle it deals.

Martin Y

Fixed. When I spent some time on the datalogs instead of just whining about it, it was obvious that -----footing around with 10% changes was a waste of time. I needed to halve the cranking pulsewidth and work from there. Starts right up now.

We now return you to your regular thread:

Zaphod

ould you please tell us, what your reqfuel is and what the cranking PWs were before and after?

Martin Y

Req. fuel 12.5ms

Before: PW 15.5 @ 85°C wouldn't fire without blipping the throttle.

After: PW 7.95 @ 94°C started easily.

Techsalvager

check datalogs, is gair moving around from 100?
If so thats probably your hard to restart issue mostly.
if your MAT correction table is 0 across the board then your MS is causing a lean condition whenever it reads a higher air temp.

FatKao

Meant to get a MSQ posted today, hopefully I'll remember tomorrow. All my recent MSQs are on my work laptop and digging that out of the car at home is far too much effort.

I have some adjustments to my MAT correction table but I'm not sure if it is enough to keep everything 0.

FatKao

Have a MSQ.

Just looked at a log, my Gair is completely fucked, sits around 93. If I adjust it to stay around 100% should I drop 7% fuel across the board to keep AFRs about even?