Draw Thru SDS Questions

2232 Views 16 Replies 4 Participants Last post by ahspimp023, Jun 13, 2008

ahspimp023

Discussion Starter · Jun 6, 2008

Im in the process of putting a brand new SDS kit back on my car. I have custom made the intake piping from the Blower to the TB with 3 Inch pipe.

<a href="http://imageshack.us"><img src="http://img155.imageshack.us/img155/6883/016rs3.jpg" border="0" alt="Image Hosted by ImageShack.us"/></a><br/><a href="http://g.imageshack.us/g.php?h=155&i=016rs3.jpg"><img src="http://img155.imageshack.us/img155/6883/016rs3.d7b80e44c7.jpg" border="0"></a>

<a href="http://imageshack.us"><img src="http://img153.imageshack.us/img153/6408/017uo3.jpg" border="0" alt="Image Hosted by ImageShack.us"/></a><br/><a href="http://g.imageshack.us/g.php?h=153&i=017uo3.jpg"><img src="http://img153.imageshack.us/img153/6408/017uo3.6730b1b739.jpg" border="0"></a>

For the intake of the Blower I am using a 90 degree coupler that reduces from 3.5" to 3". Then right under that is the MAS and then a 90 degree steel pipe that leads to the filter.

I was wondering where to recirculate the ByPass Valve (im using a Turbo XS 34 ByPass), before or after the MAS? The ByPass it self will be in between the Blower and TB with a piece of Stainless Steel Braided Hose leading to another adapter by the filter. Also with the Blow Thru setup I use to run I was running 13psi at Stage II, I am not running any new pulleys what so ever, but now that im converting to Draw Thru how should that affect the boost Psi? And my car had a great tune when it was Blow Thru, I am planning on getting the Black Box Re-tuned by a local shop here that is awsome at tuning, but I was wondering how much would need to be changed, should I have them start from scratch? If anyone happens to run the Draw Thru and Black Box is there any way to send me a tune to start out with?

Thanks guys !

1 - 17 of 17 Posts

PharmEcis

· #2 · Jun 7, 2008

Recirculating is always after the MAF. The whole point is to return air that has already been metered back into the intake system so that you don't end up running rich on shifts. You might see a psi or two more from this.

repforenzo

· #3 · Jun 7, 2008 (Edited)

PharmEcis said:
Recirculating is always after the MAF. The whole point is to return air that has already been metered back into the intake system so that you don't end up running rich on shifts. You might see a psi or two more from this.

:agreed: Careful not to have the recirculated air inlet posostioned to closely the the MAF. You don't want to send air thru the MAF in the opposite direction.

The tune may not have to be totally redone, but it will have to be adjusted. A blow-thru tune is different than a draw-thur tune, especially during idle.

ahspimp023

Discussion Starter · #4 · Jun 7, 2008

repforenzo said:
:agreed: Careful not to have the recirculated air inlet posostioned to closely the the MAF. You don't want to send air thru the MAF in the opposite direction.

The tune may have to be totally redone, but it will have to be adjusted. A blow-thru tune is different than a draw-thur tune, especially during idle.

Thanks for the input, you two are the guys I thought would chime in

Ok so now tell me if this will work, I was planning on putting the MAS right under the 90 degree coupler that leads to the blower, but that way I can not get the recirculation to be after the MAS so somehow I have to re do something. Would it be ok to have my ByPass in between the Blower and TB and also just recirculate on that same pipe?

ahspimp023

Discussion Starter · #5 · Jun 7, 2008

Repforenzo will you take some pictures of your setup for me if you get some time, I need some intense pictures to work off of.

I also thought that maybe I could weld the adapter to the pipe and cut out a hole in my 90 degree to get it recirculated as close to the blower as possible.

repforenzo

· #6 · Jun 7, 2008

ahspimp023 said:
I also thought that maybe I could weld the adapter to the pipe and cut out a hole in my 90 degree to get it recirculated as close to the blower as possible.

That is exactly what you need to do. My piping has an extension that brings the BOV right to the 90* coupler. A small piece of radiator hose goes then from the BOV into the coupler pipe (which you have to make).

See less See more

ahspimp023

Discussion Starter · #7 · Jun 7, 2008

My ByPass adapters are 1 1/4 " so I bought a two foot length of Stainless Steel Braided Radiator hose, this is what it looks like.

http://static.summitracing.com/global/images/prod/large/spe-5523_w.jpg

So repforenzo, did you cut the hole out of the 90 degree coupler and weld a adapter to the pipe inside the 90 degree?

ahspimp023

Discussion Starter · #8 · Jun 7, 2008

Pharm, can you offer me the piece before the Blower, thats all I am in need of, and will the MAS fit down there still with your kit?

repforenzo

· #9 · Jun 9, 2008

ahspimp023 said:
So repforenzo, did you cut the hole out of the 90 degree coupler and weld a adapter to the pipe inside the 90 degree?

Yes. Use a hole saw drill bit, it will make a clean hole. Then you need to fabricate a small pipe you can insert inside the coupler hole. The picture below was the original coupler I had. It was the wrong size, so I replaced it using the metal insert on my current coupler.

See less See more

ahspimp023

Discussion Starter · #10 · Jun 9, 2008

repforenzo said:
Yes. Use a hole saw drill bit, it will make a clean hole. Then you need to fabricate a small pipe you can insert inside the coupler hole. The picture below was the original coupler I had. It was the wrong size, so I replaced it using the metal insert on my current coupler.

I do not understand what is holding that in?

PharmEcis

· #11 · Jun 9, 2008

Glue.

I only have one SDS draw through piping setup in stock and I'm not willing to break it up.

repforenzo

· #12 · Jun 9, 2008

ahspimp023 said:
I do not understand what is holding that in?

I thought I didn't have a picture but I do! I used a little silicone to avoid leaks, but I didn't really have to. The hole of of the coupler provides enough squeeze to prevent any un-metered air to get in. You can't make your coupler hole too big, though.

What I did was to push this part through the hole of the coupler, and with my hand inside the coupler, I pushed this part out as far as it could go until the taper hit the coupler wall. At the same time, I slid the bov hose on the other side and pressed it as far as it would go. Then clamped the hose on. Tight seal. Keep in mind that near the inlet of the blower is the vacuum side, and there is no pressure even when the BOV is open. I haven't had any issues with this setup.

See less See more

ahspimp023

Discussion Starter · #13 · Jun 11, 2008

Repforenzo what psi are you running, I am at stage II, and I was wondering if I could use a copy of your tune for a base to start with.

thahnic1080

· #14 · Jun 11, 2008

his tune wouldnt work with your car cause he has a GTS i think

ahspimp023

Discussion Starter · #15 · Jun 11, 2008

thahnic1080 said:
his tune wouldnt work with your car cause he has a GTS i think

True, I just don't want the Performance shop to have to start from nothing. They are going to tune and dyno tune the car.
If anyone can create a Draw Thru Stage II Pulley SDS tune then let me know.

repforenzo

· #16 · Jun 13, 2008

ahspimp023 said:
Repforenzo what psi are you running, I am at stage II, and I was wondering if I could use a copy of your tune for a base to start with.

I'm running slightly below 10 psi, so my tune wouldn't be a good fit for yours. I can probably give you some pointers, though.

By the way, what are you using to tune the car? The Flash won't provide enough fuel beyond 8 psi. You need to using something else for fuel.

ahspimp023

Discussion Starter · #17 · Jun 13, 2008

My car was Stage II Blow Thru before this, my blowers bearings just seized up so I decided to start fresh, whole new Blower and all. Im running the black box. SMT-6

1 - 17 of 17 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.

Top