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#1
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TB Bypass Complete...WOW
Holy crapola!! I never thought this simple mod would od this. The car is much more "froggy" than ever before. It justaround and has plenty of power throuhgout the revband. I dunno if it is because of the 5speed or what but Ill tell ya what, I am not dissapointed at all.
Tom |
#2
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Uhmmmm
What exactly did you do?
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Former: 1994 Barcelona Red(x2), 1995 Brilliant Red, 1992 Liquid Silver, 1992 Ebony(x2), 1992 Pearl White (x2) Current: 2017 Ford Raptor 2017 Kawasaki KLR 1995 Guards Red Carrera 1995 Spec-ish Miata - track car 1957 CJ-5 |
#3
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Did you put in the valve that you mentioned or just the "bypass" for now?
If you did the valve, care to share the details? Pics? Or do I have to come to Atco next week to see it in person?
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Dave - 03 Baja - 92 SVX - 86 Brat - 08 OB 3.0 |
#4
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Was your testing on a cold engine? Can you define "froggy"?
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David B. SVXipedia @ SVX-IW.COM -- SVX Information Warehouse 2.0 coming...eventually! Ebony 1992 SVX LS-L 5 spd Koni/GC Stebro 187k miles RIP (Rust In Pieces) 1993 SVX 5 spd Koni/GC Stebro Polyurethane bushings still available! |
#5
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Quote:
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#6
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Tell us more Tom...
-Chike
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"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) |
#7
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Well th TB bypass, bypasses coolant flow around the TB to keep it cooler in summer weather. Origonally designed to keep the TB plates from freezing in cold weather it acts as a damper in the summer by keeping the throttle bodies warm which in turn warms up the air moving into the engine. Not something you want if you are looking for a good air/fuel mix.
To complete the bypass, you simply need a 3/8" ID hight temp hose about 8-12"long and two hose barbs. Simply run the barb from the original, that is now disconnected, to the new peice and then run the new peice to the other original line on the other side of the TB. It bypasses the TB but does not obstruct the flow. I did not use the valves....yet, I need to pick up the right ones. There will be 3 valves Two on the hoses routed to the TB and one on the Bypass hose that is there now. In summer the two on the TB will be closed and the one on the bypass opened. In the winter, the two on the TB will be opened and the bypass hose closed. A very simple setup will work well for a guy like me. Froggy- To tend to jump or being quick to react. I mean to say that it has much more spunk and it will get up and go from low RPMs and remains more powerful thoughout the revband. Much like the engine were cold. I have no #'s from a dyno but I have noticed quite an improvement in throttle response at the car's capabilities to grunt down low in the rpms. The engine was at full running tempurature for at least 20 mins so it was running as hot as I will usually get it this time of year(don't drive very far anymore). Hope this helps...you can also search a post made by Iggdawg that has a compelte writup and he has pics in his locker. Tom |
#8
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i did a few threads about this too. it worked great for me! like tom said much more throttle response. why did you need the extra piece of hose tom? i just got 1 3/8 barbed fitting and two hose clamps and connected the two lines together. ALL SVX OWNERS SHOULD DO THIS MOD!
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#9
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Quote:
are you going to have room for all of these valves? -Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#10
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I wil definately have room for the valves. I know I can do it with just two but I do not know the flow pattern for sure so this way I can isolate it better. I used the extra line so in the future I can operate the valve setup I mentioned earlier.
Tom |
#11
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Ahhh, now that makes sense. Throttle response has increase due to less heat being injected into the cylinder head at low speeds. At higher speeds, the throttle body doesn't have as much time to heat up since the air rushing in allows less time for that area to heat up.
If I can find the before and after heat transfer results from an old post, I'll post up a link. Someone graphed the results of this mod at the I-club and NASIOC. It was interesting. So you are going up to Atco? I need to ride up in 'Nightrider' (My FWD XT6) to see you in action. Perhaps a friendly challenge is on order.
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Kevin Thomas 1997 2.2ltr Subaru Impreza Outback Sport Wagon (AWD/Auto) 13.03@100mph 1989 2.7ltr Subaru XT6 (AWD/Auto) 15.912@85.93mph 1996 3.3ltr SVX (AWD/Auto) 15.070@91.38mph ***R.I.P*** 2010 RAV4 AWD Sport (13.717 @ 99.19mph ) 2015 Honda Fit LX CVT (15.2 @ 90mph) |
#12
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The Post
I found the Post at I-club I was referring too.
T/B Coolant Bypass Here is the graphed before and after temperature drop result of a T/B bypass mod.
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Kevin Thomas 1997 2.2ltr Subaru Impreza Outback Sport Wagon (AWD/Auto) 13.03@100mph 1989 2.7ltr Subaru XT6 (AWD/Auto) 15.912@85.93mph 1996 3.3ltr SVX (AWD/Auto) 15.070@91.38mph ***R.I.P*** 2010 RAV4 AWD Sport (13.717 @ 99.19mph ) 2015 Honda Fit LX CVT (15.2 @ 90mph) |
#13
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Hey Tom hook a brotha up!
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1993 25th Anniversary Edition # 156 of 301 ~ 121, 488 miles ( SOLD TO svxfiles 8/6/06) 2006 Subaru Impreza 2.5i....5spd - My daily driver 2006 Subaru Legacy 2.5i -7k miles..Mom's daily driver 2,543 Member of the SVX World Network |
#14
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Of course I am going to Atco... sure a little competition is welcomed as Jesse is gonna blow me outta the water with an N/A 6mt run let alone him playing with the funny stuff...
Yea Tom. we can do it, only takes 5 mins or so. Tom |
#15
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You only need one valve. All you need to do is stop the flow. A heavy clothespin would probably do it.
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