MAF install report
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If your cat is fine I suggest leaving it alone... not much to gain from it. Money best spent on a G-Pipe... my .02 anyway... these are not Turbo engined cars were you really need to let that exhaust loose...
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cup and G pipe don't reduce the backpressure they are more for sound and loosing weight.
Removing in restrictions in the cat (cat bypass) will reduce back pressure and hence will allow the engine to get rid of exhaust gases quicker especially if the intake is capable of sucking more air.
It will make a another small difference.
I want to put the car on th dyno after the nods have finished and see what all these small modification add up to.
Stefan
Removing in restrictions in the cat (cat bypass) will reduce back pressure and hence will allow the engine to get rid of exhaust gases quicker especially if the intake is capable of sucking more air.
It will make a another small difference.
I want to put the car on th dyno after the nods have finished and see what all these small modification add up to.
Stefan
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From: Abruzzo (ITALY)
Hello All,
I pulled out the MAF and installed the stock air flow meter to see the difference.
I must say straight away I was missing the low down torque.
1. Sitting in 3rd gear at a speed of 50 - 60 km/h, under 3000rpm and accelerate. With MAF the engine feels eggier to get to work with the stock item you are waiting for it to wake up. It is not neck braking acceleration but so much better that the Stock AFM.
2. Idle. With the Stock AFM the idle is annoying the hell out of me. The constant surging is not cool.
3. Top end Power, under full acceleration you do not feel a difference between the MAF and the stock unit.
4. Acceleration, the engine seems to rev quicker to the redline.
Conclusion:
$1000 is a lot of money but I would buy the MAF again, for me it belongs to the default updates / refinements for a 964.
The car feels fresh and delivers smooth modern car like power.
Future upgrades:
Cat bypass. A logical step, the MAF allows more air in now I need to get more air out.
Best Regards
Stefan
I pulled out the MAF and installed the stock air flow meter to see the difference.
I must say straight away I was missing the low down torque.
1. Sitting in 3rd gear at a speed of 50 - 60 km/h, under 3000rpm and accelerate. With MAF the engine feels eggier to get to work with the stock item you are waiting for it to wake up. It is not neck braking acceleration but so much better that the Stock AFM.
2. Idle. With the Stock AFM the idle is annoying the hell out of me. The constant surging is not cool.
3. Top end Power, under full acceleration you do not feel a difference between the MAF and the stock unit.
4. Acceleration, the engine seems to rev quicker to the redline.
Conclusion:
$1000 is a lot of money but I would buy the MAF again, for me it belongs to the default updates / refinements for a 964.
The car feels fresh and delivers smooth modern car like power.
Future upgrades:
Cat bypass. A logical step, the MAF allows more air in now I need to get more air out.
Best Regards
Stefan
Stefan,
given 100 the torque/power you get with the MAF kit, what's the torque/power with AFM at:
- 2000 rpm?
- 3000 rpm?
- 4000 rpm?
Sorry, just my way to understand the gain...
thanks
Anto
Last edited by anto1150; Apr 9, 2010 at 05:32 PM.
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MAF by itself has negligible effect on air flow or power. The primary effect is on cash flow, where the difference is easy to measure.
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From: Abruzzo (ITALY)
Read the prior posts on the dyno runs and side-by-side acceleration runs involving MAF replacement for the stock AFM. The credible posts imply you might pick up 3-4 HP at peak power if you use a less effective air filter. Even with the better stock filter, the gains off of peak power are too small to measure.
MAF by itself has negligible effect on air flow or power. The primary effect is on cash flow, where the difference is easy to measure.
MAF by itself has negligible effect on air flow or power. The primary effect is on cash flow, where the difference is easy to measure.
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MAF by itself has negligible effect on air flow or power. The primary effect is on cash flow, where the difference is easy to measure.
And it is true peak power you don't feel and difference. and the numbers I provide are a feeling nothing scientific. A shame that you can't test drive my car to see for yourself. I recon the MAF is great others might be disappointed.
Stefan
Last edited by Racker79; Apr 11, 2010 at 08:29 PM.
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Well said.
I did numerous 2000 RPM to redline acceleration runs beside a 964 C2 with a MAF mod. Then we switched cars and did it again. The MAF car drives very nicely, but so does my well-sorted AFM car.
Seeing my car keep up was probably what prevented me from getting the "feeling" the MAF had any performance benefit. That and Ninemeister's dyno data showing the stock AFM will keep up with a MAF until you pass 300 HP.
I did numerous 2000 RPM to redline acceleration runs beside a 964 C2 with a MAF mod. Then we switched cars and did it again. The MAF car drives very nicely, but so does my well-sorted AFM car.
Seeing my car keep up was probably what prevented me from getting the "feeling" the MAF had any performance benefit. That and Ninemeister's dyno data showing the stock AFM will keep up with a MAF until you pass 300 HP.
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From: Calgary, AB
Well said.
I did numerous 2000 RPM to redline acceleration runs beside a 964 C2 with a MAF mod. Then we switched cars and did it again. The MAF car drives very nicely, but so does my well-sorted AFM car.
Seeing my car keep up was probably what prevented me from getting the "feeling" the MAF had any performance benefit. That and Ninemeister's dyno data showing the stock AFM will keep up with a MAF until you pass 300 HP.
I did numerous 2000 RPM to redline acceleration runs beside a 964 C2 with a MAF mod. Then we switched cars and did it again. The MAF car drives very nicely, but so does my well-sorted AFM car.
Seeing my car keep up was probably what prevented me from getting the "feeling" the MAF had any performance benefit. That and Ninemeister's dyno data showing the stock AFM will keep up with a MAF until you pass 300 HP.
It appears to me that both are providing accounts of driving a vehicle with a MAF installed, and arriving at different conclusions - neither of which has more validity than the other.
I agree with you that it is unclear the performance benefit of a MAF - but neither account here is strictly factual or scientific.
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Weren't there a number of differences between the two cars in this case (weight, other performance mods..) that prevented this from being "scientific" as well? I could be wrong here..
It appears to me that both are providing accounts of driving a vehicle with a MAF installed, and arriving at different conclusions - neither of which has more validity than the other.
I agree with you that it is unclear the performance benefit of a MAF - but neither account here is strictly factual or scientific.
It appears to me that both are providing accounts of driving a vehicle with a MAF installed, and arriving at different conclusions - neither of which has more validity than the other.
I agree with you that it is unclear the performance benefit of a MAF - but neither account here is strictly factual or scientific.
Last edited by springer3; Apr 12, 2010 at 11:59 PM. Reason: typo
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From: Cambridge/Boston, MA
Slight hijack...
Grenade without serious internal strengthening at hp over 320???
Which experts are these? What internal mods are they suggesting? And which parts are self-destructing? This is quite contrary to my understanding.
Grenade without serious internal strengthening at hp over 320???
Which experts are these? What internal mods are they suggesting? And which parts are self-destructing? This is quite contrary to my understanding.
