Would this be possible? (Keeping boost down idea)
03-07-02, 10:50 PM
#26
ACK! On series 4 (87-88) turbos w/ free flow intake and exhaust it doesn't affect MAX boost if the wastegate is full open 100% of the time- its being over-run; its flow is inadequate to keep "natural boost" down and has nothing to do w/ when it opens.
To bring boost down you must increase exhaust backpressure, restrict intake or (the one that doesn't hurt performance) increase the flow capabilities of the wastegate.
I certainly noticed ALOT more high rpm flow w/ 3" TID mod VS stock TID- this caused wastegate over-run even w/ my very ported S.4 wastegate.
To bring boost down you must increase exhaust backpressure, restrict intake or (the one that doesn't hurt performance) increase the flow capabilities of the wastegate.
I certainly noticed ALOT more high rpm flow w/ 3" TID mod VS stock TID- this caused wastegate over-run even w/ my very ported S.4 wastegate.
03-07-02, 11:00 PM
#27
No, its just your friend's Talon has a crappy turbo
03-08-02, 12:09 AM
#28
I did the 3" TID mod and have the RB midpipe, downpipe, and the Apexi N1 duals on my 87 T2. I only produced 6 psi of boost with this setup. I had to go to a ball and spring boost controler to up my boost to 11psi. It will hold 11 rock steady no matter what the weather. My wastegate is still stock, never been ported. I think my situation is rare however. I will be upgrading to a hybrid in the near future and will definately port the wastegate at that time.
03-08-02, 01:59 AM
#30
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Originally posted by rx7_turbo2
I did the 3" TID mod and have the RB midpipe, downpipe, and the Apexi N1 duals on my 87 T2. I only produced 6 psi of boost with this setup
I did the 3" TID mod and have the RB midpipe, downpipe, and the Apexi N1 duals on my 87 T2. I only produced 6 psi of boost with this setup
03-08-02, 02:31 AM
#31
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people are actually hitting 9-11psi with only an exhaust ? I have already dropped in a K&N DoubleCone, but my boost pattern is still quite low: something like 30-30-40 x10mmHg (which translates to 6-6-8), and it drops really fast 
Maybe a DP and catback will help me....
(geez, how pathetic AM I ? I've talking about getting a DP and catback since Day 1
)
Maybe a DP and catback will help me....
(geez, how pathetic AM I ? I've talking about getting a DP and catback since Day 1
)
03-08-02, 10:05 AM
#33
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Originally posted by Scott 89t2
as I stand, I'm hitting about 9 psi with the RB exhaust and stock intake box and stock TID. I hit 11 with a k&N cone and stock TID.
I think this summer I'm going to add a 3" cat which I'm hoping will lower it a few psi. Then I can add a bigger TID and cone filter and still only creep to 10. (hopefully) I figure I'd have more power and better spool with a cat, k&N, and tid then with no cat and stock intake. but the boost creep would be about the same. plus with the cat I'd be legal
we'll see what happens, the best way would be to take the turbo off and port it though... but that takes more work
as I stand, I'm hitting about 9 psi with the RB exhaust and stock intake box and stock TID. I hit 11 with a k&N cone and stock TID.
I think this summer I'm going to add a 3" cat which I'm hoping will lower it a few psi. Then I can add a bigger TID and cone filter and still only creep to 10. (hopefully) I figure I'd have more power and better spool with a cat, k&N, and tid then with no cat and stock intake. but the boost creep would be about the same. plus with the cat I'd be legal
we'll see what happens, the best way would be to take the turbo off and port it though... but that takes more work
03-08-02, 11:22 AM
#34
Originally posted by Scott 89t2
you probably only have the 2.5" dp/midpipe one if you bolted it to a N1... but you should still have more then 6... your turbo is probably shot.
you probably only have the 2.5" dp/midpipe one if you bolted it to a N1... but you should still have more then 6... your turbo is probably shot.
03-08-02, 04:39 PM
#35
Mine will creep to 12psi in the higher gears with K&N filter, stock TID, ported engine, a downpipe, the bonez hi-flow cat and an apexi N1. It will even do 12 with the restrictor thing jammed in the exhaust, though you lose some top end and it sounds real shitty when you get to 6000rpm+
I wonder if they ported the wastegate when they rebuilt it (previous owner) It's a S5 motor btw
I wonder if they ported the wastegate when they rebuilt it (previous owner) It's a S5 motor btw
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