Granatelli MAF Sensor Question
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Instructor
Joined: Oct 1999
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From: Lexington KY
Granatelli MAF Sensor Question
I'm thinking of adding this to my Christmas wish list and have a couple of questions:
1) Does it really boost HP and how much should I expect? My MN6 C5 has a Twinflo intake and Corsa exhaust but is otherwise performance stock.
2) Are the effects seen on a car that hasn't had a performance reprogram of the PCM?
3) If you replace the whole MAF sensor, I presume the additional mod of MAF Ends no longer applies? In other words, MAF Ends are used simply to upgrade the stock MAF sensor, right?
Thanks for your help :seeya
1) Does it really boost HP and how much should I expect? My MN6 C5 has a Twinflo intake and Corsa exhaust but is otherwise performance stock.
2) Are the effects seen on a car that hasn't had a performance reprogram of the PCM?
3) If you replace the whole MAF sensor, I presume the additional mod of MAF Ends no longer applies? In other words, MAF Ends are used simply to upgrade the stock MAF sensor, right?
Thanks for your help :seeya
Le Mans Master
Joined: Nov 2000
Posts: 6,266
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From: Galloway Twp. NJ
Cruise-In VII Veteran
Re: Granatelli MAF Sensor Question (SteveSz)
I added one to my car.
I believe it gave me some increase in power, mainly because it does flow more that the stock unit.
But what really helped me was adding the MAF Translator.
the MAFT helped me tune the PCM for the added airflow that I was now getting.
with my mods and the stock MAF W/screen removed, I was running about 15% lean.
the Granatelli was running me about 5% rich. It think it was better to tune the car from a 5% rich condition than 15% lean.
I dyno'd the car at corvettes @ carlisle, it had 317Hp and 327ft-Lbs Torque.
that was running 5% rich (before I got the MAFT) I should have a little more power now.
:cheers:
[Modified by RPOZ4Z, 2:27 PM 11/30/2001]
I believe it gave me some increase in power, mainly because it does flow more that the stock unit.
But what really helped me was adding the MAF Translator.
the MAFT helped me tune the PCM for the added airflow that I was now getting.
with my mods and the stock MAF W/screen removed, I was running about 15% lean.
the Granatelli was running me about 5% rich. It think it was better to tune the car from a 5% rich condition than 15% lean.
I dyno'd the car at corvettes @ carlisle, it had 317Hp and 327ft-Lbs Torque.
that was running 5% rich (before I got the MAFT) I should have a little more power now.
:cheers:
[Modified by RPOZ4Z, 2:27 PM 11/30/2001]
Thread Starter
Instructor
Joined: Oct 1999
Posts: 139
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From: Lexington KY
Re: Granatelli MAF Sensor Question (RPOZ4Z)
Thanks RPOZ4Z,
What is a MAF Translator? Are you saying you didn't really see any improvement with just the MAF Sensor alone? I thought that b/c the MAF Sensor mod increases power by increasing airflow that just like with an intake and exhaust mod, you shouldn't need to do anything else and the PCM will relearn and adjust on its own. Am I wrong?
What is a MAF Translator? Are you saying you didn't really see any improvement with just the MAF Sensor alone? I thought that b/c the MAF Sensor mod increases power by increasing airflow that just like with an intake and exhaust mod, you shouldn't need to do anything else and the PCM will relearn and adjust on its own. Am I wrong?
Le Mans Master
Joined: Nov 2000
Posts: 6,266
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From: Galloway Twp. NJ
Cruise-In VII Veteran
Re: Granatelli MAF Sensor Question (SteveSz)
It's hard to tell how much of an increase I saw.
I installed the donaldson filter at the same time as the Granatelli MAF.
a MAF translator plugs into the harness between the MAF and the PCM.
it is used to "tune" the air fuel ratio. there are two adjustments, one for cruise and one for WOT.
you will need a diagnostic program like ease or autotap to tune the MAF.
the PCM dosn't compensate for the increased airflow from adding a ported MAF. that's why the granatelli is a "recalibrated" unit.
which is why I was 5% rich with the Granatelli and 15% lean with a Ported stock MAF.
[Modified by RPOZ4Z, 3:10 PM 11/30/2001]
I installed the donaldson filter at the same time as the Granatelli MAF.
a MAF translator plugs into the harness between the MAF and the PCM.
it is used to "tune" the air fuel ratio. there are two adjustments, one for cruise and one for WOT.
you will need a diagnostic program like ease or autotap to tune the MAF.
the PCM dosn't compensate for the increased airflow from adding a ported MAF. that's why the granatelli is a "recalibrated" unit.
which is why I was 5% rich with the Granatelli and 15% lean with a Ported stock MAF.
[Modified by RPOZ4Z, 3:10 PM 11/30/2001]
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From: God Bless America
Re: Granatelli MAF Sensor Question (RPOZ4Z)
Lemme ask you this-- I ordered the Re-cal/re-loc MAT sensor---
where the hell does it go on my car?
Sounds stupid, I know, but the 2001 is different, so I'm not sure where to put it...
:cheers:
where the hell does it go on my car?
Sounds stupid, I know, but the 2001 is different, so I'm not sure where to put it...
:cheers:
Le Mans Master
Joined: Nov 2000
Posts: 6,266
Likes: 156
From: Galloway Twp. NJ
Cruise-In VII Veteran
Re: Granatelli MAF Sensor Question (MDL-01C5)
I think on the 2001 the MAT sensor is built into the MAF.
you really don't need it anyway.
I had one and went back to stock. :cheers:
you really don't need it anyway.
I had one and went back to stock. :cheers:
Melting Slicks
Joined: Jul 2000
Posts: 2,483
Likes: 1
From: Wilmington DE
Re: Granatelli MAF Sensor Question (SteveSz)
Steve:
I'll try to answer your questions based on my experience. I too have a 2000 FRC with the Granatelli MAF and twin K&N filters. I found that changing from the Stock MAF and filter to the Granatelli and dual filters increases the RWH by 16 HP. I later added a timing tricker which plugs into the air bridge between the MAF and the Thorttle body. This "fools" the computer into thinking the air charge is always cold, which pumps more fuel into the engine.
I have not reprogramed my PCM. And, yes the MAF ends are for the stock MAF meter.
The car runs very smoothly and strong, and definately feels like more HP.
I'll try to answer your questions based on my experience. I too have a 2000 FRC with the Granatelli MAF and twin K&N filters. I found that changing from the Stock MAF and filter to the Granatelli and dual filters increases the RWH by 16 HP. I later added a timing tricker which plugs into the air bridge between the MAF and the Thorttle body. This "fools" the computer into thinking the air charge is always cold, which pumps more fuel into the engine.
I have not reprogramed my PCM. And, yes the MAF ends are for the stock MAF meter.
The car runs very smoothly and strong, and definately feels like more HP.
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Advanced
Joined: Nov 2001
Posts: 96
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From: Mount Olive NJ
Re: Granatelli MAF Sensor Question (SteveSz)
I changed mine at the same time adding the BPP vortex and power duct. Air flow through the MAF is definately better then the stock one. I know GMS sells two versions of this for the 2001 there is one tuned for cold air boxes and one that is not incase you do not change your air intake. I do not really know what the major difference is between the two i image it is just some program changing. they are both the same price, so it can't be anything to major
Intermediate
Joined: Oct 2001
Posts: 26
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From: Minneapolis MN
Re: Granatelli MAF Sensor Question (MDL-01C5)
This MAFS/MAFT issue is starting to sound like a lot of other mods -- they work great on 1997-99 C5's, but don't really help (and maybe hinder) performance on 2000+ C5's.
MDL-01C5, if that MAFT doesn't work for you, I might be interested in buying it.
MDL-01C5, if that MAFT doesn't work for you, I might be interested in buying it.
Intermediate
Joined: Oct 2001
Posts: 26
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From: Minneapolis MN
Re: Granatelli MAF Sensor Question (Supercharged)
Don't you mean 97-00 vrs. 01-0?
MDL-01C5, I'll email you tonight or tomorrow. I have to run right now. :seeya
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From: Monticello MN
Re: Granatelli MAF Sensor Question (Gandalf)
I know GMS sells two versions of this for the 2001 there is one tuned for cold air boxes and one that is not incase you do not change your air intake. I do not really know what the major difference is between the two i image it is just some program changing. they are both the same price, so it can't be anything to major
Ed
[Modified by C5XTASY, 6:43 PM 11/30/2001]
Pro
Joined: May 2001
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From: Virginia, U.S.
Re: Granatelli MAF Sensor Question (C5XTASY)
I also have an '01 with the Vortex/GMS/LAPD high flow duct/coupler. The first GMS MAF was for stock boxes, and pinged on the high end. They sent me a 5% rich version and now I have no pinging, and "wiggle room" for other leaning conditions-like a full exhaust :reddevil
Not sure if I gained much power, but like the 5%-but miss the airbridge in the middle (I think it flows too much air at lower RPMS causing mild off throttle bucking below 2K)
Mr. G told me himself the 10% is for power adders...
Not sure if I gained much power, but like the 5%-but miss the airbridge in the middle (I think it flows too much air at lower RPMS causing mild off throttle bucking below 2K)
Mr. G told me himself the 10% is for power adders...
Safety Car
Joined: Oct 2000
Posts: 4,949
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From: Monticello MN
Re: Granatelli MAF Sensor Question (DAP)
I also have an '01 with the Vortex/GMS/LAPD high flow duct/coupler. The first GMS MAF was for stock boxes, and pinged on the high end. They sent me a 5% rich version and now I have no pinging, and "wiggle room" for other leaning conditions-like a full exhaust :reddevil
Not sure if I gained much power, but like the 5%-but miss the airbridge in the middle (I think it flows too much air at lower RPMS causing mild off throttle bucking below 2K)
Mr. G told me himself the 10% is for power adders...
Not sure if I gained much power, but like the 5%-but miss the airbridge in the middle (I think it flows too much air at lower RPMS causing mild off throttle bucking below 2K)
Mr. G told me himself the 10% is for power adders...
Ed
[Modified by C5XTASY, 11:32 PM 11/30/2001]
Pro
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From: Virginia, U.S.
Re: Granatelli MAF Sensor Question (C5XTASY)
This was about 4 months ago. Also, 10% rich sounds REALLY rich. He mentioned NOS/turbo/supercharger. I have gotten some interesting responses from them before.
I've read where the CPU guys define slightly rich for power and detonation free as 2-3%. The 5% should be right all the way up to exhaust for efficiency-and still be rich.
Also, for what it's worth-I have the cold air box on my Vortex, which would "cancel" your exhaust work (I know boys, it's a stretch :rolleyes: )
I get no pinging in hot weather with coolant in the 220's, and my gut instinct says I'm still running a little too rich for power.
I have hopes FLP's new C5 full length headers, high flow cats, X pipe, and a Z06 exhaust will lean me out for power (and lose 50 pounds of dead exhaust weight!!). I will hopefully have/install them by March.
I've read where the CPU guys define slightly rich for power and detonation free as 2-3%. The 5% should be right all the way up to exhaust for efficiency-and still be rich.
Also, for what it's worth-I have the cold air box on my Vortex, which would "cancel" your exhaust work (I know boys, it's a stretch :rolleyes: )
I get no pinging in hot weather with coolant in the 220's, and my gut instinct says I'm still running a little too rich for power.
I have hopes FLP's new C5 full length headers, high flow cats, X pipe, and a Z06 exhaust will lean me out for power (and lose 50 pounds of dead exhaust weight!!). I will hopefully have/install them by March.
Intermediate
Joined: Oct 2001
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From: Minneapolis MN
Re: Granatelli MAF Sensor Question (C5XTASY)
Does anyone know how to tell the 5% GMS MAF from from the 10% MAF by part number or by looking at it. The GMS part number I have is 350112.
C5XTASY, do you know anyone in town with AutoTap or EASE? If not, maybe TPIS or Doug Rippie (DRM) can help me out cheaper than buying one of those.
:seeya
[Modified by Red Rage, 8:37 AM 12/1/2001]
C5XTASY, do you know anyone in town with AutoTap or EASE? If not, maybe TPIS or Doug Rippie (DRM) can help me out cheaper than buying one of those.
:seeya
[Modified by Red Rage, 8:37 AM 12/1/2001]
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From: Monticello MN
Re: Granatelli MAF Sensor Question (Red Rage)
Does anyone know how to tell the 5% GMS MAF from from the 10% MAF by part number or by looking at it. The GMS part number I have is 350112.
C5XTASY, do you know anyone in town with AutoTap or EASE? If not, maybe TPIS or Doug Rippie (DRM) can help me out cheaper than buying one of those.
:seeya
C5XTASY, do you know anyone in town with AutoTap or EASE? If not, maybe TPIS or Doug Rippie (DRM) can help me out cheaper than buying one of those.
:seeya
No, unfortunately I do not know anyone with the equipment. Let me know if you find someone.:)
Also, my MAF came with 10% rich scratched in the plastic and with an attached sheet indicating the richness calibration.
Ed
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From: Lexington KY
Re: Granatelli MAF Sensor Question (Jim 47)
Thanks Jim,
Your answer was the closest to the question I asked. But just to repeat, can anyone tell me if I put a Granatelli MAF Sensor (NO Translator) on my 2000 FRC which already has a twinflo intake, will I see any difference in performance WITHOUT doing any reprogramming?
Thanks :seeya
Your answer was the closest to the question I asked. But just to repeat, can anyone tell me if I put a Granatelli MAF Sensor (NO Translator) on my 2000 FRC which already has a twinflo intake, will I see any difference in performance WITHOUT doing any reprogramming?
Thanks :seeya