odonnell

I feel like I'm taking crazy pills on this one. I'll be at a stop sign or something in neutral and clutch in and put it into 1st. Sometimes, like maybe one time in ten, the revs climb by ~100 rpm. It isn't a problem at face value but I have no idea this happens and am curious about clutch engagement.

I thought that if the clutch was still slightly engaged the revs would drop (not rise) as though it was under load without pedal compensation. Is there any way the revs would actually climb? 100% sure my foot is nowhere near the throttle and the only mechanical link has to be from the driveline itself.

Unless it's a crazy coincidence but it's happened enough times now that I'm pretty sure there's a link.

AlphaOmegaPower

Before my throttle body reseal mine did that.

thomasmryan

Firewall flexing?

Tiger03447

Dear Michael: did this do this before you started the M/squirt conversion or afterwards? Alph/Omega may be on to something here, esp since you've been playing around with the intake, coils, etc..check the bolts for a loose one..Do you have your A/F gauge hooked up yet? If so, does that change too? might be leaning out a bit when the load is taken off, or, since the clutch is disconnecting the driveline, the resistance on the driveline, and trans gears will unload the engine, allowing an RPM rise.

V2Rocket

when you clutch in, the engine is no longer having to spin (even in neutral while stopped) a 20lb driveshaft and all the bits freewheeling inside the transmission in heavy oil.
less load for a given air/fuel going in (fixed due to closed throttle and idle maps) = higher revs...

odonnell

Nothing is hooked up electrically yet, it's still Motronic for now. The thing is that the load isn't being taken off when I put it into gear. The revs increase is relative to my foot being on the clutch (unloaded). So I'm not sure how the load decrease to any less than that, even having it in neutral would be slightly more load.

Throttle body is rebuilt already but I've been wanting to redo it because I think I messed up one of the shaft seals...I can sometimes hear a faint leak from there when the car is cold.

Not sure, foot is planted on the clutch across all the different comparisons but I'll check it out.

The thing is, the clutch is already in BEFORE the rev increase. So I'll be clutched in (fully isolated engine from TT/trans) and then when I physically move the shifter into 1st, the revs bump up a little. So the clutch is depressed and the engine *should* be unloaded for all of it.

V2Rocket