Builds Beaten, built, 80 series rebuild thread (1 Viewer)

[dogfishlake]

Here's the suprise I found after I got the SC off, melted bypass valve. When I first put it together with the cx racing header, I didn't have a heat shield. After a couple weeks, i sandwiched some ceramic blanket in there and it seemed to help, but I think my damage was done at the point. I really didn't notice it not functioning to make me go looking, but looking back, I recall a few things- part throttle surge, SC getting extremely warm after part throttle cruising, slighy poorer fuel mileage, weird vacuum issues especially with braking after snapping the throttle shut (no vacuum).
I just ordered one up and I am going to start on a good quality heat shield set up for it.

 

[dogfishlake]

The hose for the bypass was in really bad shape. There was still structure all around but cracks throughout the woven part. This was giving me losses during boost, I think, as well as sucking air under vacuum (likely causing Po171)

 

[scottryana]

Going to be nice having everything cleaned up and I can't wait to see your readings from your per/post IC gauge.

 

[dogfishlake]

Going to be nice having everything cleaned up and I can't wait to see your readings from your per/post IC gauge.

Yeah, it's embarrassing opening the hood like it is when people are around.

I'm looking forward to posting some data. It will be a bit hokey, but I figure I'll have my daughter help me plot (write down) information in real time while I drive. Things like launch after sitting heat soaking, temp cruising at different speeds. Also, temperature change when the methanol injection comes on.

 

[scottryana]

Yeah might be tough to plot it, maybe just record the gauge with your phone and throw the videos up. i.e. Climbing a incline, heat soaked in traffic, with and without water/meth spraying, etc.

 

[dogfishlake]

The maniflod from the supercharger was in rough shape and I couldn't find a sulver to match the other parts, so I sandblasted it and powder coated it black with clear like the supercharger body.

 

[dogfishlake]

I also coated the bracket for the charcoal canister and modded the tab my fuse box bolts to because the spot weld broke. I mig welded that sucker so it shoud be good now. The canister is different from the vc120 but is the same physical size and was readily available and cheaper on Amazon.

 

[dogfishlake]

I did header wrap on my primary tubes,to try to cool the SC area down. Next I took some thin aluminum and formed a heat shield. It is double layer with ceramic insulation from McMaster Carr in the middle. The front is open so hopefully air from the fan pushes through there.

 

[dogfishlake]

I did a quick mock up with the bypass valve and no SC and you can see how easy it was to melt it. Hopefully now it stays cool enough. One way to find out.

 

[dogfishlake]

Still quite a ways to go but it is getting there. Quick intercooler mock up, and installed the smaller SC pulley (3").

 

[fl4031003]

Is that paint or powercoat on the valve cover? Also what's the color code?

Jeff

 

[dogfishlake]

Is that paint or powercoat on the valve cover? Also what's the color code?

Jeff

It's powder coat. Color is RAL 3020 red with clear

 

[dogfishlake]

I got my intercooler temp guage installed today, sort of, enough for a trial run. I did acceleration rins with the methanol injection turned on and off. Unfortunately I mistakenly erased tbe video with it off! It did make a difference but I can't remember how much, I was trying to do a lot at once. Probably 5-10 degrees. The first video I accelerated from stopped to about 70, cruised for a bit then hit it again. The intercooler knocks things down at least 10° to around 20°.
The second video is puttering up my driveway, sitting for a minute idling, then driving again. I was surprised at the lack of temp rise sitting.
I will try to get more useful data- this is just a start. Overall I think the top mount cooler is a plus.

 

[dogfishlake]

Second one

 

[NLXTACY]

View attachment 1309208 Here's the suprise I found after I got the SC off, melted bypass valve. When I first put it together with the cx racing header, I didn't have a heat shield. After a couple weeks, i sandwiched some ceramic blanket in there and it seemed to help, but I think my damage was done at the point. I really didn't notice it not functioning to make me go looking, but looking back, I recall a few things- part throttle surge, SC getting extremely warm after part throttle cruising, slighy poorer fuel mileage, weird vacuum issues especially with braking after snapping the throttle shut (no vacuum).
I just ordered one up and I am going to start on a good quality heat shield set up for it.

Part numbers/prices for the bypass and hose. I've been warned that bypass can melt.

 

[NLXTACY]

I did a quick mock up with the bypass valve and no SC and you can see how easy it was to melt it. Hopefully now it stays cool enough. One way to find out.View attachment 1313050

I found doing the ceramic coat on the manifold and heat shields helped a lot

 

[dogfishlake]

My bypass is an ebay item. Was listed as a TRD part, but really it's the same as a lot of the eaton units on the GM 3.8. Once we give up trying to get these stupid fish to bite, I'll look my stuff up.

 

[pkelly72]

Still quite a ways to go but it is getting there. Quick intercooler mock up, and installed the smaller SC pulley (3").View attachment 1313051

Could you report back any differences that you can feel with the smaller pulley. I know it's subjective but any thoughts would be appreciated.

 

[dogfishlake]

 

[NLXTACY]

Could you report back any differences that you can feel with the smaller pulley. I know it's subjective but any thoughts would be appreciated.

I've got a 2.8 that might go on once the temps go down.