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      10-26-2012, 11:05 AM   #1
E30 Racer
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I'm not referring to turbo lag per se, more like reducing spool time. What modification(s) have the most profound effect on this? Comments based on direct experience appreciated.
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      10-26-2012, 11:21 AM   #2
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The less restricted the air intake system and exhaust system the quicker the turbos will spool. So free up your factory air intake with one of the multiple options out there. For the exhaust getting rid of the cats is the first thing I'd do. The single biggest item to perceptably reducing time to spool will be the catless downpipes though.
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      10-26-2012, 11:28 AM   #3
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Absolutely agree with decatted downpipes from personal experience
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      10-26-2012, 12:47 PM   #4
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n55 midpipes?
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      10-26-2012, 12:52 PM   #5
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Push the M button!

When actuated, it closes the wastegates, thereby decreasing spool time and speeding the transition from partial to full throttle.

Neil
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      10-26-2012, 04:49 PM   #6
E30 Racer
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Pushing the M button certainly makes things more lively, but to me the biggest effect of the M button feels like it changes the gain of the throttle pedal vs throttle body position. Regardless, throttle response lag just after tip-in is still present.

I think the issue is spool time. With a DCI this becomes really apparent...push the throttle, hear the spool, then get pushed back.

Maybe it's simply a turbo thing, and I'm used to very responsive normally aspirated motors. My E30 runs on Megasquirt, my 540i/6 has a lot of displacement. Both cars blow the 1M out of the water when it comes to what happens 100-200 ms after you hit the gas.
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      10-26-2012, 04:59 PM   #7
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+1 for intake...

Though I'm not sure about cat delete. Less back pressure less torque. (I think)

The only real thing which should help to lose that slow response feeling is shorter gear ratio of final drive. But there is no options as I know for 1M
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      10-26-2012, 08:54 PM   #8
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Quote:
Originally Posted by RimasRS View Post
Less back pressure less torque. (I think)
Only for NA engines.
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      10-27-2012, 08:21 AM   #9
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Quote:
Originally Posted by E30 Racer View Post
Pushing the M button certainly makes things more lively, but to me the biggest effect of the M button feels like it changes the gain of the throttle pedal vs throttle body position. Regardless, throttle response lag just after tip-in is still present.

I think the issue is spool time. With a DCI this becomes really apparent...push the throttle, hear the spool, then get pushed back.
I suspect that is a placebo effect.

The stock intake effectively "muffles" the sound of the intake tract and turbos, so you're hearing them much more with the DCI's.

Since DCIs offer gains of only 4-6 rwhp, I don't believe they're causing the turbos to spin-up more quickly and suspect that you're really just hearing them more.

Neil

Last edited by MDORPHN; 10-27-2012 at 11:37 AM.
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      10-27-2012, 08:39 AM   #10
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Left foot brake so you can be back to throttle before you lift off the brake. Save mod $$$ for track time and beer.
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      10-27-2012, 09:02 AM   #11
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Quote:
Originally Posted by Dan Parker
Save mod $$$ for track time and beer.
Right on, brother
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      10-27-2012, 03:41 PM   #12
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The M button works great! Best throttle step in mod for the $.
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      10-29-2012, 03:40 AM   #13
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Quote:
Originally Posted by Dan Parker View Post
Left foot brake so you can be back to throttle before you lift off the brake. Save mod $$$ for track time and beer.
Shirley you can't be serious. Are you talking track only or the street as well.
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      10-29-2012, 04:36 AM   #14
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Quote:
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Shirley you can't be serious. Are you talking track only or the street as well.
This confuses me, some people don't left foot brake every time they touch the brake pedal?
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      10-29-2012, 08:18 PM   #15
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Quote:
Shirley you can't be serious. Are you talking track only or the street as well.
Track only but even then I don't think it's much benefit on the 1M. I was mostly kidding really. It's an old technique 911 turbo guys used to keep the turbo spooled back when big lag was an issue. They would left foot brake and use the right foot to work the throttle so corner exit wasn't a big waiting game.
When I tracked my 1M I didn't think there was any delay in boost worth mentioning. When power oversteer at corner exit is a common characteristic of the 1M I don't see where said delay is. Like others have said, the M button helps and it's just a push away. I preferred to leave it off because I like 100% throttle to be 100% throttle. That's me and I'm old school.

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