1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

ROTARYSHACK GSL-SE 13B 4port blowthrough turbo project

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Old 10-25-03, 04:44 AM
  #26  
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Ah! the pics are back...Very nice. Doesn't a turbo car need a BOV to function properly, otherwise the compressed air has no place to go under deceleration causing big problems......
Old 10-25-03, 06:10 AM
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No, plenty of cars out there without BOV's.
Old 10-25-03, 10:28 AM
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Originally posted by 81projectrx7

I can't figure out if its manual or auto like others have mentioned. What is it?
count the pedals
Old 10-25-03, 05:33 PM
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hey what kind of rims are those i been looking for some like that but in black for my r100
Old 10-25-03, 06:47 PM
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Originally posted by XLR8
Ah! the pics are back...Very nice. Doesn't a turbo car need a BOV to function properly, otherwise the compressed air has no place to go under deceleration causing big problems......
Not using a BOV makes it harder on the turbo durring shifting. It starts to spin the turbo backwards because of the built up pressure after the compressor, and puts stress on the shaft. It makes it so the turbo must spool all the way back up after you shift. It is still fine to run without one though, the turbo will put up with the abuse, and last probably 1/2-3/4 as long as normal.
Old 10-27-03, 01:07 PM
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Originally posted by HonDaKillaH
hey what kind of rims are those i been looking for some like that but in black for my r100
the rims are autobahn type 15x 7 with 205-50-15 tires on them
Old 10-27-03, 01:08 PM
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Originally posted by coldy13
Not using a BOV makes it harder on the turbo durring shifting. It starts to spin the turbo backwards because of the built up pressure after the compressor, and puts stress on the shaft. It makes it so the turbo must spool all the way back up after you shift. It is still fine to run without one though, the turbo will put up with the abuse, and last probably 1/2-3/4 as long as normal.
right on!!!!
Old 11-16-03, 11:50 AM
  #33  
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lucky bastard, Ill have a screamer one day...
Old 11-18-03, 12:40 AM
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Hey 680, I ran into you on anothyer site where you posted pics of the 12a you just finished. Nice job. I've got a question for you guys. I have an S5 T2 front clip that I'm swapping the motor out of. It came with ECU, harness, etc. I already have a Dellortro 48 DHLA from a different project. Now I'm really torn between using the carb or buying injectors and a feul contreoller and swapping the EFI. I'd love to run a mild street port and upgrade the compressor on the turbo. What do you guys think?
Old 11-18-03, 05:42 AM
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Originally posted by POKINATCHA
Hey 680, I ran into you on anothyer site where you posted pics of the 12a you just finished. Nice job. I've got a question for you guys. I have an S5 T2 front clip that I'm swapping the motor out of. It came with ECU, harness, etc. I already have a Dellortro 48 DHLA from a different project. Now I'm really torn between using the carb or buying injectors and a feul contreoller and swapping the EFI. I'd love to run a mild street port and upgrade the compressor on the turbo. What do you guys think?
well if your going for simplicity, ease of installation and good performance then you gotta go with the blowthrough system... if you are looking for maximum hp then you need to go with efi, but you better have a good tuner or your dead in the water!!
Old 10-08-07, 09:17 AM
  #36  
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i have a simular set up, what turbo manifold did you use? custom or modify a s4/5?
thanks
Mark
Old 10-08-07, 11:33 AM
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wheres the water goin?

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this thread is 4 yrs old
Old 10-08-07, 08:03 PM
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Originally Posted by 3rd and final 7
this thread is 4 yrs old
Thats ok, 680 is still around.
Old 10-08-07, 08:14 PM
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premix, for f's sake

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Originally Posted by 3rd and final 7
this thread is 4 yrs old
lol, thats what i was thinking
Old 10-08-07, 08:38 PM
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it might take me 4 yrs to get to it though, lol...
its a s5 stock turbo/ manifold sir
Old 10-09-07, 03:25 AM
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Originally Posted by 680RWHP12A
it might take me 4 yrs to get to it though, lol...
its a s5 stock turbo/ manifold sir
Thanks for the quick reply! so i persume you spin the exhaust manifold 180degrees what other modification does it need to fit as i though the ports wouldn't line up? i know the studs won't

thanks
Mark
Old 10-09-07, 01:30 PM
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=680RWHP12A

Originally posted by coldy13
Not using a BOV makes it harder on the turbo durring shifting. It starts to spin the turbo backwards because of the built up pressure after the compressor, and puts stress on the shaft. It makes it so the turbo must spool all the way back up after you shift. It is still fine to run without one though, the turbo will put up with the abuse, and last probably 1/2-3/4 as long as normal.
right on!!!!



right on!!!!
I disagree with the "1/2-3/4 as long as normal" statement....

Actually, there have been studies showing that BOV's do not actually lengthen the turbos life at all. Before you give me grief on this just hear me out. Because I always thought having a turbo spinning at 100k+ RPMs and then slamming your throttles closed and surging the hell out of the compressor would be hard on it as well....it's just common sense right? But apparently turbos are alot tougher than I thought.

The Grandnational guys have been arguing over this for years. And they have tested 2 identical grand nationals one with a BOV and one w/o and ran them 100k. Then removed the turbos and mic'd out all the parts. The turbos were almost identical. Neither showing a negligible difference in wear.

Take it for what U will.... The tests have been done by several other manufacturers with similar results.


But if you drive a manual, it does help with relieving manifold pressure between shifts and if it is vented back into the inlet helps to keep the turbo spooled up between shifting as well.

If U drive an auto turbo car I'd spend the money elsewhere IMO. But since none of you do.... I'm probably ****'n in the wind here.

:cheers:

AND NICE CAR 680RWHP12A!
Old 10-09-07, 01:35 PM
  #43  
Just turn up the boost!
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i hate bov's
Old 01-11-08, 01:54 AM
  #44  
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not to be an *** but 680RWHP12A u still have pix for this se turbo?
Old 01-11-08, 02:19 PM
  #45  
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^ Max, this thread is approaching 5 years old! :o
Old 01-11-08, 11:14 PM
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lol i noe didnt want to make a new thread cuz i was thinking of doing a sim setup.
Old 01-12-08, 02:51 PM
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well since this thread is back from the dead here some pics :)

back from the dead so i figured i would dig up some pics
Attached Thumbnails ROTARYSHACK GSL-SE 13B 4port blowthrough turbo project-111_1104.jpg   ROTARYSHACK GSL-SE 13B 4port blowthrough turbo project-111_1105.jpg   ROTARYSHACK GSL-SE 13B 4port blowthrough turbo project-111_1106.jpg   ROTARYSHACK GSL-SE 13B 4port blowthrough turbo project-111_1107.jpg  
Old 01-12-08, 06:20 PM
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thx mang ull hear from me soon to come. im just getting some idea's on wat i want to do with my se. i noe im going turbo and carb. but iono if i should stay 6 port with a 12a center irons or go all out for a 4 port. im going to use se internals. this car isnt a daily so thinking for a half bridge or something. i jsut miss driving my fb...i just doesnt feel the same lol
Old 01-12-08, 11:20 PM
  #49  
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^^ really hard to read what you are trying to say.^^

Spell the words out a little better... Make it easier on us old timers...


L8R
Old 01-12-08, 11:24 PM
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Wow, that is a beautiful seven man. The only thing I'm not crazy about is the whale tail, but thats just a peference. How much power does that setup make


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