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#4045846 - 02/01/20 11:39 PM Re: Removing comb from DBW TB gasket [Re: CommanderCody]
CommanderCody Offline
Member

Registered: 02/10/18
Posts: 196
Loc: USA
Today I removed the comb from the gasket and there is a improvement in throttle response. Now it almost feels like a drive by cable throttle rather than DBW, the typical DBW lag is gone.
_________________________
2008 P71 EX-National Park Service, throttle comb delete, Jmod, passenger airbag switch, splash guards, police trunk pack, Gamber Johnson floor plate, Havis console, and Tuffy cup holders.
1987 Buick Regal Limited with SBC V8 swap, TES headers, electronic Qjet, ZZ4 chip, THM200-4R 4 speed trans, 3.73 ratio posi rear end, and KYB shocks.
2002 Ford Ranger 4x4 4L
1946 Farmall Model A tractor with 12v alternator upgrade and electronic ignition.

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#4047272 - 02/13/20 11:46 AM Re: Removing comb from DBW TB gasket [Re: CommanderCody]
CommanderCody Offline
Member

Registered: 02/10/18
Posts: 196
Loc: USA
A little update, after performing surgery on the TB gasket, the engine did idle at a higher speed. Performed a PCM relearn and the car is idling at 600 RPM in park again. Most of the DBW lag is still gone after the PCM relearn. I suspect that with larger DBW throttle body upgrades, you probably need to do at least a PCM relearn since just a higher flowing gasket upgrade benefited from it.
_________________________
2008 P71 EX-National Park Service, throttle comb delete, Jmod, passenger airbag switch, splash guards, police trunk pack, Gamber Johnson floor plate, Havis console, and Tuffy cup holders.
1987 Buick Regal Limited with SBC V8 swap, TES headers, electronic Qjet, ZZ4 chip, THM200-4R 4 speed trans, 3.73 ratio posi rear end, and KYB shocks.
2002 Ford Ranger 4x4 4L
1946 Farmall Model A tractor with 12v alternator upgrade and electronic ignition.

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#4047276 - 02/13/20 12:15 PM Re: Removing comb from DBW TB gasket [Re: CommanderCody]
2011LX Offline
Over the Hill

Registered: 08/31/13
Posts: 1399
Loc: SE WI
If somebody wants to datalog and show me a postive before-and-after of MAF readings at WOT, I'll maybe buy that technically makes a difference, even if insignificant.

Until then, I still say it does zilch.
_________________________
2011 Crown Victoria LX - purchased @ 37k miles
currently @ 100k miles
Dark Toreador Red Metallic exterior
Medium Light Stone interior

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#4047328 - 02/13/20 10:46 PM Re: Removing comb from DBW TB gasket [Re: CommanderCody]
2004_p71 Offline

no replacement for displacement
Posting Addict

Registered: 09/04/03
Posts: 15763
Loc: Quebec Canada
it does zilch
_________________________


new best time 13.079 @ 105 1.8 60'

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#4047334 - 02/13/20 11:30 PM Re: Removing comb from DBW TB gasket [Re: CommanderCody]
CommanderCody Offline
Member

Registered: 02/10/18
Posts: 196
Loc: USA
There is improved throttle response, mainly down low. There is at least enough difference to affect the computer anyway. My guess is that it probably does do zilch at high throttle openings like WOT. However, at low throttle openings where there is a low airflow condition, even a small change can have a noticeable affect. Its why with carbs, the idle adjustment is the most sensitive and easily knocked off of adjustment.

At low angle throttle opening, those vanes are probably restrictive. As I said, there is less tip in lag at off idle with the combs deleted. When I first performed the comb delete, the engine wanted to idle at 1K to 800 rpm until I did the relearn which knocked the idle back down to 600 rpm. This indicates that there may be higher airflow at low throttle openings which required the PCM to relearn to idle the engine correctly again.
_________________________
2008 P71 EX-National Park Service, throttle comb delete, Jmod, passenger airbag switch, splash guards, police trunk pack, Gamber Johnson floor plate, Havis console, and Tuffy cup holders.
1987 Buick Regal Limited with SBC V8 swap, TES headers, electronic Qjet, ZZ4 chip, THM200-4R 4 speed trans, 3.73 ratio posi rear end, and KYB shocks.
2002 Ford Ranger 4x4 4L
1946 Farmall Model A tractor with 12v alternator upgrade and electronic ignition.

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#4047832 - 02/18/20 07:49 PM Re: Removing comb from DBW TB gasket [Re: CommanderCody]
slowlane Offline
Rookie

Registered: 01/21/16
Posts: 70
Loc: Wisconsin
I also tried this simple mod just to see if it really does anything, and on my 2005 MGM it did liven up the low end throttle response. The car is absolutely NOT faster than before but feels quicker to respond in relation to pedal position, especially starting off from a stop. I had previously done the DBW throttle relearn procedure to some effect, but the car always seemed to need a small amount of time to think about throttle inputs before finally giving in. I modified a replacement spacer and kept my original just in case, because engineers usually don't just put stuff like that in for no reason. I did perform the DBW relearn procedure again after the mod and I am happy with the results. Gas mileage is still the same 21-22 mpg I've always got.


Edited by slowlane (02/18/20 08:01 PM)
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2005 Mercury Grand Marquis GS bought at 90k currently 150k
1966 Volkswagen Beetle
1965 Buick Riviera
1985 Chevrolet G20 Van
1969 Plymouth Roadrunner

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#4049754 - 03/01/20 12:22 PM Re: Removing comb from DBW TB gasket [Re: CommanderCody]
GM_Guy Offline
Posting Addict

Registered: 12/17/00
Posts: 18608
Loc: London, Ontario Canada
Just curious, how much tip in lag do you guys experience? My cvpi has virtually none when compared to other efi cars I drive which have painfully obvious tip in lag--which may be why I don't notice it.
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#4050562 - 03/06/20 08:28 PM Re: Removing comb from DBW TB gasket [Re: CommanderCody]
TheCableGuy Offline
Over the Hill

Registered: 04/08/19
Posts: 1034
Loc: Far Northwest AZ
So I can actually put my opinion up since I got around to doing this today. I noticed a small difference on the response in the gas pedal but enough to just notice it. It was that or the fact that my throttle body was dirty as [censored]. So.. yeah. Kinda invalid.
_________________________
2010 P7B 150K. 11K hours. 3.27, RKE, Cruise, Ported stock plenum, JMod, ADTR sway bar, KYB rear shocks. DIY Headlight harness upgrade, with projector retrofit: Mini H1’s.

Previous rides:
2011 Sierra 1500 155K, too many mods to list. (RIP 01-05-2019)
2001 Durango R/T 5.9. 230K. SOLD 5-1-19

They laugh at me because I’m different. I laugh at them because they’re all the same- Heath Ledger


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#4054308 - 03/24/20 05:36 PM Re: Removing comb from DBW TB gasket [Re: 2004_p71]
Drac Offline

Cpt. Smug
Over the Hill

Registered: 03/19/10
Posts: 3345
Loc: Cali
Originally Posted By 2004_p71
it does zilch


Beat me to it, Pier.
_________________________

2004 Crown Victoria finished in Dark Pearl Blue Metallic (DX) | Ported M122 powered DOHC conversion with all supporting mods. Dyno queen.
2010 BMW M5 V10 finished in Monaco Blue Metallic with 2-tone interior | Eisemann race exhaust | Lowered On Dinan coilovers. Daily Driver

BlueVic's DOHC Supercharged Build.
Bluevic's 1,000 RWHP Returnless Fuel System.
2009+ Window/Lock/Mirror Control Switches Retrofit.
Mercury Cougar Trunk Switch Retrofit.








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#4108766 - 05/12/21 03:42 PM Re: Removing comb from DBW TB gasket [Re: CommanderCody]
chazmo67 Offline

Member

Registered: 09/06/02
Posts: 317
Loc: North Hampton, NH
I replaced the comb gasket with one from a 2002 crownvic. A little better throttle response. Noticeable improvement in MPG (1 - 1.5) while cruising on the highway.
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Chazmo67

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#4108772 - 05/12/21 04:29 PM Re: Removing comb from DBW TB gasket [Re: CommanderCody]
2008interceptor Offline
Over the Hill

Registered: 09/02/02
Posts: 3276
Loc: Pennsylvania
One thing on the comb delete and apparent improved response. If the car ends up with lag after it's adapting. Won't it just end up learning how to do so with the increased air?
_________________________
2008 Ford Crown Victoria Police Interceptor P71 with street appearance package.

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