Ported TB and Descreened MAF result's
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From: Bridgewater,Ma
Ported TB and Descreened MAF result's Got bored today and headed to the dyno.Car is the same I posted before which is a stock 02 346 with Kooks,Magnaflow and 4000 stall. All runs are with a locked converter,no timing changes and A/F dialed in.Engine temp was 185' on the beggining of each pull.
Run 5 is the before -It is from last time but the before pulls today were exactly the same #'s and follow perfectly,just the old graph was smoother for comparison(had noise on the pulls)
Run 9 -changed to a ported TB done by myself.No A/F changes needed.
Run 12- removed MAF screen,car went .6 point leaner and lost 15hp at first.I dialed the A/F back to the other's and gained some back but still lost hp.
So,on a stock/header car the ported TB was worth 8hp/2tq with most of the gain up top and a descreened MAF lost hp.I know a MAF mod is good on H/C cars but it just doesn't work on these lower hp cars.
Graph 1 shows the difference between the 3 and graph 2 shows the HP loss with the MAF
Run 5 is the before -It is from last time but the before pulls today were exactly the same #'s and follow perfectly,just the old graph was smoother for comparison(had noise on the pulls)
Run 9 -changed to a ported TB done by myself.No A/F changes needed.
Run 12- removed MAF screen,car went .6 point leaner and lost 15hp at first.I dialed the A/F back to the other's and gained some back but still lost hp.
So,on a stock/header car the ported TB was worth 8hp/2tq with most of the gain up top and a descreened MAF lost hp.I know a MAF mod is good on H/C cars but it just doesn't work on these lower hp cars.
Graph 1 shows the difference between the 3 and graph 2 shows the HP loss with the MAF
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From: Bridgewater,Ma
Originally Posted by Alvin
I've pulled the screens out of a few cars on the dyno during runs and they have all picked up 5rwhp or so after getting the +.2-4 AFR back down
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Originally Posted by Alvin
I've pulled the screens out of a few cars on the dyno during runs and they have all picked up 5rwhp or so after getting the +.2-4 AFR back down
I did the same on many cars they all gain about 4-7 hp taking the screen of.
