ZR-1 Net Registry Forums  

Go Back   ZR-1 Net Registry Forums > C4 ZR-1 > C4 ZR-1 Technical Postings

Reply
 
Thread Tools Display Modes
Old 04-22-2015   #11
Locobob
 
Join Date: Jan 2004
Location: Portland, OR
Posts: 1,057
Default 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.
__________________
Robert

ZR-1 Net Registry Oregon State Director

91 ZR-1 #431 Black/Black LPE 368
Locobob is offline   Reply With Quote
Old 04-22-2015   #12
LGAFF
 
LGAFF's Avatar
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
Default Re: ported plenum and injector housings..

Quote:
Originally Posted by Vette73 View Post
700 for the porting....From what I understand is you send him 700.....He ports one, sends you the plenum when it's ready....Then you send him yours...

Thats what I charge.....
__________________
LGAFF
90 #966-150K miles-sold
92 #234-sold
1987 Callaway TT #17
1991 ZR-1 #1359
LGAFF is offline   Reply With Quote
Old 04-22-2015   #13
Vette73
 
Join Date: Nov 2014
Location: Brooklyn ny
Posts: 1,045
Default Re: ported plenum and injector housings..

Ok my bad....I stand corrected...
Vette73 is offline   Reply With Quote
Old 04-23-2015   #14
Bearly Flying
 
Join Date: Dec 2012
Location: Ponoka, Alberta, Canada
Posts: 158
Default 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.
__________________
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
Bearly Flying is offline   Reply With Quote
Old 04-23-2015   #15
G8nightman
 
G8nightman's Avatar
 
Join Date: Dec 2007
Location: NYC
Posts: 1,189
Default Re: ported plenum and injector housings..

Quote:
Originally Posted by Locobob View Post
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.
Is this just the plenum ported or the fuel injector housing as well?
__________________
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"
G8nightman is offline   Reply With Quote
Old 04-24-2015   #16
LGAFF
 
LGAFF's Avatar
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
Default Re: ported plenum and injector housings..

For my or Locobobs thats both the plenum and IHs being ported
__________________
LGAFF
90 #966-150K miles-sold
92 #234-sold
1987 Callaway TT #17
1991 ZR-1 #1359
LGAFF is offline   Reply With Quote
Old 04-24-2015   #17
Billy Mild
 
Join Date: Aug 2014
Location: Kansas City, MO
Posts: 838
Default Re: ported plenum and injector housings..

Quote:
Originally Posted by LGAFF View Post
For my or Locobobs thats both the plenum and IHs being ported
How much power does it usually add? Is it 20-30 WHP?

I assume you have to retune after this mod?
__________________
Looking for a ZR-1
1985 Yamaha RZ350-NOT STOCK
1971 Yamaha AT1-Middle of a restoration
Billy Mild is offline   Reply With Quote
Old 04-24-2015   #18
LGAFF
 
LGAFF's Avatar
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
Default 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.
__________________
LGAFF
90 #966-150K miles-sold
92 #234-sold
1987 Callaway TT #17
1991 ZR-1 #1359
LGAFF is offline   Reply With Quote
Old 04-24-2015   #19
JohnWins
 
Join Date: Jun 2014
Location: Pope AFB, N.C.
Posts: 5
Default Re: ported plenum and injector housings..

Quote:
Originally Posted by Locobob View Post
Actually I charge $900 to do a customer supplied, $1500 for my core - $600 refunded with core return. I do these completely by hand - usually 60-70 hours of meticulous work.
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?
JohnWins is offline   Reply With Quote
Old 04-24-2015   #20
Jim Nolan
 
Join Date: Jan 2007
Location: Florida
Posts: 241
Default 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.
Jim Nolan is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 04:58 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright ZR-1 Net Registry 2020