Performance Manifold Query
24 October 2005, 04:30 PM
#1
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Location: Surrey
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Performance Manifold Query
I have a 93 scoob with these mods:
Full exhaust whith de-cat, downpipe and rear section all upgraded,
Running 0.9bar,
Apexi air intake,
Blits blowoff valve,
Air flow adjuster,
Tuned by STI,
Jap import,
Down at pod i ran a 14.1 with out the perormance exhaust.
Im now getting my tublar (spelling sorry) manifold put on on Saturday.
What gains are there in power, ect
And i heared thet it takes away the scooby rumble.
Can any one enlighten me on the ups and downs of this product, i have tryed to find out info on this part but cant find what i am looking for.
Full exhaust whith de-cat, downpipe and rear section all upgraded,
Running 0.9bar,
Apexi air intake,
Blits blowoff valve,
Air flow adjuster,
Tuned by STI,
Jap import,
Down at pod i ran a 14.1 with out the perormance exhaust.
Im now getting my tublar (spelling sorry) manifold put on on Saturday.
What gains are there in power, ect
And i heared thet it takes away the scooby rumble.
Can any one enlighten me on the ups and downs of this product, i have tryed to find out info on this part but cant find what i am looking for.
24 October 2005, 05:00 PM
#4
TD05 Turbo?
The choice of headers is very important and should not be left to chance.
Generally the tubular headers will move the spool point 300-500 rpm up the rev band but free up power beyond say 5000rpm.
How often are you beyond 5,000 RPM?
Too big an up-pipe diameter on a smallish engine will also slug spool.
Also consider haveing your O/E headers ported, PROPERLY. No loss of spool and more power throughout the rev band but not as much as you get from the best of the tubular at top end.
At all costs avoid the Magan headers. There are other cheap and nasty items on the market which will split and leak in a short time and others will be able to share their experiences.
I use GT Spec and have no problems although some have experienced difficulty with the flanges but this is a fitting issue. The latest GT spec have three bolt flanges and seem to be relatively robust.
The choice of headers is very important and should not be left to chance.
Generally the tubular headers will move the spool point 300-500 rpm up the rev band but free up power beyond say 5000rpm.
How often are you beyond 5,000 RPM?
Too big an up-pipe diameter on a smallish engine will also slug spool.
Also consider haveing your O/E headers ported, PROPERLY. No loss of spool and more power throughout the rev band but not as much as you get from the best of the tubular at top end.
At all costs avoid the Magan headers. There are other cheap and nasty items on the market which will split and leak in a short time and others will be able to share their experiences.
I use GT Spec and have no problems although some have experienced difficulty with the flanges but this is a fitting issue. The latest GT spec have three bolt flanges and seem to be relatively robust.
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