Intake Manifold Modifications.....
- Thread starter BlkZoomZoom
- Start date
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- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
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- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
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- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
Also alittle update. Check engine light is now off, Fixed that wednesday morning. Idle is now normal. Performance is quite noticable, however had unexpected complications.....
Since the thing felt so strong on the street I decided the first couple of runs at street psi (8psi. spike 9). Results were damn impressive (13.65, 13.60 both at 103mph.) I then decided to bump it to the normal spot on the boost controller (usually around 13psi, spike 15), however that only netted 10psi spike 11...results 13.44 @ 104.8. It then rained, cooled off, they dried the track, it rained again, they dried it again.....(read: no traction compound applied). I was afraid to turn the boost controller up more because I thought something was wrong or hooked up wrong so I left it there. Next two runs were 2.45, then 2.55 60's. It then pulled to a 13.56 and a 13.61....all with 10psi.
I realized this morning a likely reason for the loss of boost was due to the loss of restriction in the intake manifold. If I simply cranked the boost controller somemore it would have run it's best run no doubt. But alas I'm not running the MSP anymore this year.....oh well.
Since the thing felt so strong on the street I decided the first couple of runs at street psi (8psi. spike 9). Results were damn impressive (13.65, 13.60 both at 103mph.) I then decided to bump it to the normal spot on the boost controller (usually around 13psi, spike 15), however that only netted 10psi spike 11...results 13.44 @ 104.8. It then rained, cooled off, they dried the track, it rained again, they dried it again.....(read: no traction compound applied). I was afraid to turn the boost controller up more because I thought something was wrong or hooked up wrong so I left it there. Next two runs were 2.45, then 2.55 60's. It then pulled to a 13.56 and a 13.61....all with 10psi.
I realized this morning a likely reason for the loss of boost was due to the loss of restriction in the intake manifold. If I simply cranked the boost controller somemore it would have run it's best run no doubt. But alas I'm not running the MSP anymore this year.....oh well.
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- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
I'm basing this off a little story a guy at work with a supercharged mustang. He had a pulley on his mustang that gave him 9psi. He put higher flowing heads on (thats it). And the boost dropped to 6psi (with the same pulleys). So the way I took it less restriction meant less boost built up.?.?
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- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
if you think of it as boost being a measurment of restriction of air going into the engine (if the engine could flow more than the turbo put out, there wouldn't be any boost), then it makes more sense. I'm really not sure, but I like this theory other than ones that my mind has come up with.
yea, well we will see what happens when mine is done, although ive not once had a problem with my boost spiking or dropping off(besides the time i blew the hg at the track)...so if it doesn't hit 9, we will know what the problem is(the porting), im going to be porting out probably as much as you did, maybe a little less. Also the TB thanks for that pic, gives me idea how much you ported it out...im about 1/2 way done with that, all the metal got stuck on my face from the TB was a pain to get off lol.
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- Hemi Ram, 71 Plymth Scamp, 71 Plymth Duster 340, 69 Dart 340/4sp
yeah almost 4psi less and even shitter 60's.
wait brian your not running anymore or lebanon is closing for the season?
Right, but if you run the boost controller from the wastegate, it shouldn't really matter. That would be like losing boost due to a slightly bigger intercooler pipe.BlkZoomZoom said:
Methinks the rain=moisture in the air=harder to compress=less boost?
Glowmunkey
Member
Very common. Same thing happened to my buddy's supercharged prelude... header dropped like 1/2 psi with the same pulley.BlkZoomZoom said:
Glowmunkey
Member
So the MP3 manifold is the same as the MazdaSpeed one, except for the ULEV shutters? If so, I guess that would make a good starting point for porting... corrrect?SpicyMchaggis said:
