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post #91 of Old 12-04-2011, 08:38 PM
jeepjunkymike
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Quote:
Originally Posted by 1717pxcb View Post
you will heat sock a top mount intercooler as well.
when i had a mazdaspeed3, they came with stock top mounts...definitely a problem for heat soak.
i can't think of one build of a car that came naturally aspirated from the factory that uses a top mount by choice.
i've seen a whole lot of build threads too.
do yourself a favor and get a front mount.
87-88 ford t-bird turbo coupe had top mount intercoolers

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post #92 of Old 12-04-2011, 09:31 PM Thread Starter
TurboTPI
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Quote:
Originally Posted by jtackerman28
Those were bulit to take the boost
It doesn't matter if a car was built for boost or not. A turbo works under the same theory regardless. Blow off valves are not required.

02 WJ Limited 4.7l HO-stock (Hers)
95 ZJ 4.0 Turbo-up 5.5 on 33x12.5's, Ford 8.8 w/Artec truss (His)
92 Firebird Formula custom turbo setup (His)
09 Polaris Dragon 800 (His)
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post #93 of Old 12-05-2011, 09:21 AM
badbird17x
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You have to have a by pass valve, BPV, or a blow of valve, BOV in a turbo setup to relieve the boost when you let off the throttle.

If you already have a BPV then you don't need a bov. If its just a turbo with a waste-gate, and no relief it is dangerous as hell.

Somewhere there has to be something to release 8 psi of boost when the throttle is released.

94 jz, bruiser, la, cage,5.3 ls, 36 swampers 98 jz, the mutt, 3.5 iro, 33 swampers, avalanche conversion, 02 north face avalanche blacked out work truck, 06 rhino R1 engine, 4x4, Leeroy's custom paint, 04 escalade wifes truck 22s, 03 duramax 18s, completely blacked out, efilive by nick, wicked wicked truck, 39 chop chevy rod, aluminum 5.3 ls, 08 apex, 310hp mcx turbo, holz 162, completely black, CCM built.
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post #94 of Old 12-05-2011, 09:34 AM
aircruiser
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Yeah my buddy had the issue on his old bug when we put a turbo on his bug with no BOV. Blew the head gasket with all the boost it couldn't handle it. That was fun. Ended up hooking up a BOV with a duck call attached to it.

1996 XJ on 36" TSLs, 4", locked F/R, stretched
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post #95 of Old 12-05-2011, 12:49 PM
ZJ5point2GCL
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Quote:
Originally Posted by TurboTPI

It doesn't matter if a car was built for boost or not. A turbo works under the same theory regardless. Blow off valves are not required.
He is correct, blow off valves are not required, I was just wondering of he had one.
My new twin turbo truck doesn't have one nor did my diesel have one stock.
As long as you don't get compressor surge, or the throttle blowing open after you let off it doesn't matter.
I think some people are confusing it with a wastegate.

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98 Deep Slate Niner- 6''s on 35's ---11 F150 Platinum Pearl White- Modded Tiny V6 with Two Turbos. ---93 Black 5.2 limited- Slowly dying in my Parents Driveway
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post #96 of Old 12-05-2011, 03:12 PM
badbird17x
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Waste gate controls boost, you need a relief as well. My dmax doesn't have a bov either but it does have a relief. Something has to release the boost. My friends dmax runs 42 lbs of boost with no bov. There is a relief in the system or it would blow the throttle blades open.

94 jz, bruiser, la, cage,5.3 ls, 36 swampers 98 jz, the mutt, 3.5 iro, 33 swampers, avalanche conversion, 02 north face avalanche blacked out work truck, 06 rhino R1 engine, 4x4, Leeroy's custom paint, 04 escalade wifes truck 22s, 03 duramax 18s, completely blacked out, efilive by nick, wicked wicked truck, 39 chop chevy rod, aluminum 5.3 ls, 08 apex, 310hp mcx turbo, holz 162, completely black, CCM built.
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post #97 of Old 12-05-2011, 04:23 PM
red43
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A bov releases the boost when the throttle is closed suddenly. It prevents compressor surge, continued use without it will cause premature wear/failure of the turbo. Diesels don't have bov bedside they do not have throttle plates.
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post #98 of Old 12-05-2011, 05:04 PM
badbird17x
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Good point, diesels just cut the fuel.

94 jz, bruiser, la, cage,5.3 ls, 36 swampers 98 jz, the mutt, 3.5 iro, 33 swampers, avalanche conversion, 02 north face avalanche blacked out work truck, 06 rhino R1 engine, 4x4, Leeroy's custom paint, 04 escalade wifes truck 22s, 03 duramax 18s, completely blacked out, efilive by nick, wicked wicked truck, 39 chop chevy rod, aluminum 5.3 ls, 08 apex, 310hp mcx turbo, holz 162, completely black, CCM built.
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post #99 of Old 12-05-2011, 05:20 PM
harwood909
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any problems with that UCA?

Custom Machined Budget Boost
http://www.jeepforum.com/forum/f13/custom-machined-budget-boost-1121835/

Literally Built
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post #100 of Old 12-05-2011, 05:33 PM
elf517
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how much hp gain did you get?
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post #101 of Old 12-05-2011, 07:24 PM Thread Starter
TurboTPI
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You can think what ever you want, But believe me, you do not need a blow off valve. I have a mid 10 sec turbo firebird, i didn't have a blow off valve on it for years, I added one to prevent the charge air tubes from blowing off. Duramax trucks, or any other diesel's for that matter, don't have any kind of "relief system" stock. You can add one to a diesel, but it's not common at all. The only reason for a blow off valve is to prevent turbo surge, and so far there has been no surge. It also helps if the charge air piping is blowing off when you let out of the throttle. I've never heard of the boost pressure pushing open the throttle plate.

No problem with the upper control arm so far.

No dyno numbers yet. But it sure feels great. It has to be making over 200 rwhp. Pretty good considering these things don't even make 150 rwhp stock.

02 WJ Limited 4.7l HO-stock (Hers)
95 ZJ 4.0 Turbo-up 5.5 on 33x12.5's, Ford 8.8 w/Artec truss (His)
92 Firebird Formula custom turbo setup (His)
09 Polaris Dragon 800 (His)
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post #102 of Old 12-05-2011, 07:43 PM
freakinheep89
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Ok thats pretty neat. Now you do realize that the logical progression of modifications here is now 4.6 stroker kit> more boost> a new transmission to replace the one you just blew up.

TJ-
95 ZJ 5.2- D30/XJ shafts/D35 Yukon alloys,249, 2"BB, 30x9.5"Wildcat EXT,lots of motor mods, rancho shocks & stabilizer.

Quote:
Originally Posted by slayercr23 View Post
How would i go about Stroking it?
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post #103 of Old 12-05-2011, 08:04 PM
TheHalfWit
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Quote:
Originally Posted by freakinheep89 View Post
Ok thats pretty neat. Now you do realize that the logical progression of modifications here is now 4.6 stroker kit> more boost> a new transmission to replace the one you just blew up.
Naa, I think a couple of those steps aren't needed considering how the 42re is built. If he's lucky it'll last another month with likely 250 horsepower coming in.

Calm. C.

If a week goes by without needing to replace something, pinch me because I must be dreaming.
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post #104 of Old 12-05-2011, 08:20 PM
freakinheep89
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Quote:
Originally Posted by TheHalfWit View Post
Naa, I think a couple of those steps aren't needed considering how the 42re is built. If he's lucky it'll last another month with likely 250 horsepower coming in.
I give it til around the time he gets the new o2 sensor and goes for one of the "long pulls" he's been anticipating.








OP- awesome job, it doesnt need any kind of heat shielding? i figured with the plastic coolant tank and cruise control actuator there that heat would be a problem.

TJ-
95 ZJ 5.2- D30/XJ shafts/D35 Yukon alloys,249, 2"BB, 30x9.5"Wildcat EXT,lots of motor mods, rancho shocks & stabilizer.

Quote:
Originally Posted by slayercr23 View Post
How would i go about Stroking it?
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post #105 of Old 12-05-2011, 08:21 PM
Tazenutz
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A BOV is not needed but it does have some benefits. When you let off the throttle with no BOV the compressed air will bleed back out the compressor causing the turbo to flutter(the whomp-whomp-whomp sound) The compressor wheel doesn't actually spin backwards but rather stops and continues. This will cause the turbo to not spool back up as quickly as with a BOV. They actually make anti surge compressor housing to prevent it as well.

Another reason for one has to do with MAF based cars so I won't talk about that one.
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