04-22-2015 | #11 |
Join Date: Jan 2004
Location: Portland, OR
Posts: 1,057
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Re: ported plenum and injector housings..
This is a 91 with just a cat back exhaust, before and after intake porting. This is a really old dyno and it has less aggressive porting than I do now but you can see the rpm range - gains start around 4200rpm.
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Robert ZR-1 Net Registry Oregon State Director 91 ZR-1 #431 Black/Black LPE 368 |
04-22-2015 | #12 | |
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: ported plenum and injector housings..
Quote:
Thats what I charge.....
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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04-22-2015 | #13 |
Join Date: Nov 2014
Location: Brooklyn ny
Posts: 1,045
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Re: ported plenum and injector housings..
Ok my bad....I stand corrected...
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04-23-2015 | #14 |
Join Date: Dec 2012
Location: Ponoka, Alberta, Canada
Posts: 158
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Re: ported plenum and injector housings..
Cheap..... Considering the work that goes into doing a good porting job, Where else can you buy horsepower at that rate?
And the nice thing , it is not adding additional stress to your engine, it is only making it more efficient.
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91 ZR-1 Arctic White/Gray 01 C-5 Magnetic Red/Black 85 FJ 1100 (Big Bore kit, Hooligan Bike) 05 FJR 1300 Yamaha (Long Distance, Sport Touring) And a whole whack of RC Planes |
04-23-2015 | #15 |
Join Date: Dec 2007
Location: NYC
Posts: 1,189
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Re: ported plenum and injector housings..
Is this just the plenum ported or the fuel injector housing as well?
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90 Chevy ZR1 LPE #2315 'SOLD' 90 Chevy ZR1 LPE #2774 'SOLD' 91 Chevy ZR1 Callaway aerobody 91 Chevy ZR1 #1512 91 Chevy ZR1 #951 95 Chevy ZR1 #338 'SOLD' 91 BMW 850i 94 BMW 850csi 95 BMW 850csi 94 Lotus Esprit S4 07 Benz CLS550 06 BMW M5 "SOLD" |
04-24-2015 | #16 |
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: ported plenum and injector housings..
For my or Locobobs thats both the plenum and IHs being ported
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
04-24-2015 | #17 |
Join Date: Aug 2014
Location: Kansas City, MO
Posts: 838
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Re: ported plenum and injector housings..
How much power does it usually add? Is it 20-30 WHP?
I assume you have to retune after this mod?
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Looking for a ZR-1 1985 Yamaha RZ350-NOT STOCK 1971 Yamaha AT1-Middle of a restoration |
04-24-2015 | #18 |
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: ported plenum and injector housings..
Thats a safe #, 20-30 RWHP. Tuning will optimize...however the power levels vary based upon the health of the motor and were the cam timing is from the factory.
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
04-24-2015 | #19 |
Join Date: Jun 2014
Location: Pope AFB, N.C.
Posts: 5
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Re: ported plenum and injector housings..
That's awesome that you and LGAFF both offer a good price on the porting. How much power will you pickup with porting the TB & air horn. Should you get a Marc H or other chip after the porting, how much power would you be leaving on the table without it?
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04-24-2015 | #20 |
Join Date: Jan 2007
Location: Florida
Posts: 241
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Re: ported plenum and injector housings..
You have to get the chip e-programmed, otherwise there will not be a significant difference in performance. When you give it more air you have to give it more gas. Expect your mileage to drop slightly, more if the heads are done. It's addictive, when I had the heads done and headers, no cats dyno tuned the HP climbed through 6500 leveled off and did not drop off through 7200. If I had the cash I would go 415..........................Wheres my ride Ted?
Last edited by Jim Nolan; 04-24-2015 at 08:11 PM. |
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