More Boost Feels GOOD!

Benesesso · 04-12-2006, 02:55 PM

Last night I used the "spacers on the wastegate actuator bracket" trick that I learned here to jack up the boost on my 1988 Supra. Instead of washers I drilled out a couple of 1/4" thick nuts and slipped them over the 2 bolts.

What a difference! Looks like I'll have ~12 lb. boost at my 1,000' altitude. I've run it up to ~10-11 so far and there is a BIG difference over the 7 (measured) stock. Looks like my turbo is still in good shape.

Next thing I'll do is take a big die grinder to the inside of the exhaust elbow and enlarge it a bit. Then I'll figure out what to do with the cats.

Here's hoping my HG (replaced before, I think) stays good. The stock bolts are tight.

Burn N' Up · 04-13-2006, 12:51 AM

Supra's like when i you ram a screw driver through the cats... The EPA doesn't

Benesesso · 04-13-2006, 02:25 AM

I've been thinking about eliminating the cat that's right near the turbo and also using some kind of spring loaded "cut-out" before the rear cat. Shouldn't be too hard to get spring that keeps the bypass/dump closed until the boost comes in.

Benesesso · 04-13-2006, 05:14 AM

I see that the Mark IV TT has ~11.5 lb boost and ~300 HP. So what approx. HP will a Mark III make at 11.5? What differences are there besides the twin turbos?

04-12-2006, 02:55 PM	#1
Benesesso 3" Exhaust Join Date: Nov 2005 Location: Phoenix, AZ Posts: 145	More Boost Feels GOOD! Last night I used the "spacers on the wastegate actuator bracket" trick that I learned here to jack up the boost on my 1988 Supra. Instead of washers I drilled out a couple of 1/4" thick nuts and slipped them over the 2 bolts. What a difference! Looks like I'll have ~12 lb. boost at my 1,000' altitude. I've run it up to ~10-11 so far and there is a BIG difference over the 7 (measured) stock. Looks like my turbo is still in good shape. Next thing I'll do is take a big die grinder to the inside of the exhaust elbow and enlarge it a bit. Then I'll figure out what to do with the cats. Here's hoping my HG (replaced before, I think) stays good. The stock bolts are tight. __________________ "You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein 1988 and 1990 Turbo Supras

04-13-2006, 02:25 AM	#3
Benesesso 3" Exhaust Join Date: Nov 2005 Location: Phoenix, AZ Posts: 145	I've been thinking about eliminating the cat that's right near the turbo and also using some kind of spring loaded "cut-out" before the rear cat. Shouldn't be too hard to get spring that keeps the bypass/dump closed until the boost comes in. __________________ "You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein 1988 and 1990 Turbo Supras

04-13-2006, 05:14 AM	#4
Benesesso 3" Exhaust Join Date: Nov 2005 Location: Phoenix, AZ Posts: 145	I see that the Mark IV TT has ~11.5 lb boost and ~300 HP. So what approx. HP will a Mark III make at 11.5? What differences are there besides the twin turbos? __________________ "You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein 1988 and 1990 Turbo Supras

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04-13-2006, 12:51 AM	#2
Burn N' Up 3" Exhaust Join Date: Sep 2005 Posts: 238	Supra's like when i you ram a screw driver through the cats... The EPA doesn't