WAWUZAT Northstar build thread (lots of pix) (Page 8/16)
Will JUL 30, 07:57 AM
I'd have to check on where, but you can buy square exhaust tubing... even mandrel bends...
Zac88GT JUL 30, 10:30 AM
Spintech sells low profile oval exhaust tubing for hot rods. They also make mufflers that slip on to it and they sound great.
WAWUZAT AUG 05, 04:07 PM
I looked at the Spintech website, but could not find any oval or rectangular tubing. I't just as well since I'll have to fabricate my own anyway because I'll need to have the rectangular tube make a turn/bend.

All I've gotten done this week is to get the intake manifold, fuel rail, and throttle body installed. I did not like the Fel-Pro intake gaskets too much, and used "clip-on" GM gaskets. I also used a GM "seal kit" to rebuild the fuel rail ... included all the O-rings, the little metal retainer clips, parts to rebuild the pressure regulator, and the short vacuum tube with rubber ends. If those of you that are familiar with the Northstar will look close at my intake manifold, you may be able to figure out why this took me an entire week.

[This message has been edited by WAWUZAT (edited 08-05-2007).]

Zac88GT AUG 05, 05:43 PM
For oval tubing go to www.spintechmufflers.com then click on accessories and then select oval tubing from the pull down menu. If you go into the products directory instead of the accessories then click on street performance and then click on the oval sportsman street type muffler for the oval muffler selection. They have pictures as well.
ryan.hess AUG 05, 05:51 PM
That looks like a 95 throttle body. Won't work with the Holley 950.

By the way, nice work on the manifold. I still have those stupid clips. I had a practice manifold to try to remove them, and decided it would be too much work after getting 1 done. It looks good though. Did you spray paint it to remove the traces of white fiberglass?

[This message has been edited by ryan.hess (edited 08-05-2007).]

WAWUZAT AUG 05, 06:49 PM
Zac -- Thanks! I found it that time. Their tubing doesn't get as "flat" as I will need. Also, their transition pieces look like all they did was flatten one end of a round elbow. The flattened end will not flow as much as the round end ... a round and an oval sharing the same perimiter will have different areas, which means different volumes passing through it.

Ryan -- What? I don't recall reading that anywhere. Of course, I could've gleaned right past it. Which throttle body should I have? I have not yet tried connecting any of the CHRFab 950 harness to my engine. I have checked some connections, particularly at the coil pack, but I have not checked them all to see if they fit. And yes, it took me about 10 hours to cut, grind, and sand all those clips off. I thought I was going to burn up my Dremel tool. I did spray paint it ... tried some of that Krylon Fusion in flat black paint for plastics.

[This message has been edited by WAWUZAT (edited 08-05-2007).]

ryan.hess AUG 05, 07:32 PM

quote
Originally posted by WAWUZAT:
Ryan -- What? I don't recall reading that anywhere. Of course, I could've gleaned right past it. Which throttle body should I have? I have not yet tried connecting any of the CHRFab 950 harness to my engine. I have checked some connections, particularly at the coil pack, but I have not checked them all to see if they fit. And yes, it took me about 10 hours to cut, grind, and sand all those clips off. I thought I was going to burn up my Dremel tool. I did spray paint it ... tried some of that Krylon Fusion in flat black paint for plastics.



Yeah, the 95 has a throttle kicker motor instead of an IAC. You want a 96-99 that looks like this:

http://cgi.ebay.com/ebaymot...em&item=180146100223

Note it doesn't have a lip for an intake attachment. The MAF bolts to the throttle body, and that's what the intake tubing attaches to. You can use a gutted out MAF or build a flange/pipe piece that bolts to the TB.
Nashco AUG 06, 04:01 PM
Another source for oval tubing:

http://www.burnsstainless.com/

I also didn't realize the Holley setup needed the later throttle body, I got a Holley 950 setup used. I guess I'll have to swing by the junkyard and pick one up when I get to that point; I noticed they didn't have the typical GM stepper motor on the '95 SLS engine I got, which will actually work out a bit easier when I go to Megasquirt.

What are you planning on using to control the trans? I see that you're using the 4T80E and want to use a Holley setup...???

Bryce

[This message has been edited by Nashco (edited 08-06-2007).]

WAWUZAT AUG 08, 05:31 PM

quote
Originally posted by ryan.hess: Yeah, the 95 has a throttle kicker motor instead of an IAC. You want a 96-99 that ...



Ryan -- Sure enough! My CHRFab 950 Commander wiring harness will not fit the "kicker motor" connection. I went back through my literature, and I could not find any text that says I must use a '96 - '99 throttle body. Even CHRFab's website says, "The tuning power of the Holley Commander 950 has just jumped to the next level. The PRO software is available now. This is our most popular engine management system with over 260 units currently installed on Northstar engines ('93-'99)." ... without any mention of needing to run a later-model TB. I found and purchased one on eBay, and it should be here early next week. Now I'll have two '95 throttle bodies to get rid of later on, plus a NIB GM "kicker motor" ... plus an extra set of heads, VIN-Y camshafts, an intake manifold, fuel injectors, and a few other parts I'm sitting on until after the engine is running.

Nashco -- Thanks for the link, but again, the tubing they offer isn't quite flat enough for my needs. I'll make my own from 16ga. sheet metal which will probably be only 1-1/2" high by about 4" wide.

[This message has been edited by WAWUZAT (edited 08-08-2007).]

Kento AUG 08, 06:30 PM

quote
Originally posted by WAWUZAT:



What Model Harley is that in the Background????