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08-28-2005, 11:46 AM #1
- Join Date
- Aug 2005
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- Orange County/(Hudson Valley), NY
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- 26
Black- '98 WS6 Trans Am
With new cam and ported heads....?
With new cam and ported heads, I'm curious what kind of gas mileage are you guys getting? If you could respond with your cam and head specs and then the difference you see in your gas mileage now. Thanks in advance!
Last edited by BatCar; 08-28-2005 at 11:48 AM.
Black '98 WS6 Trans AM (A4)
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08-28-2005, 11:51 AM #2
- Join Date
- Aug 2005
- Location
- Texas Department of Corrections
- Posts
- 18,128
- Retired Outlaw Sum Bitch
Patriot Stage II
Comp Cam (if I recall) 224ish 585ish 113 LSA
Bout 15-17 mpg regardless of highway or town....
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08-31-2005, 08:37 PM #3
- Join Date
- Aug 2005
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- Orange County/(Hudson Valley), NY
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- 26
Black- '98 WS6 Trans Am
TTT....thanks Sarge. Anyone else?...Is there a big difference from what you were getting before?
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09-07-2005, 11:20 PM #4
the heads will make it drop a couple of MPG but the big difference is how big of a cam you have and who tunes it and how it is driven.
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09-09-2005, 09:31 AM #5outlawz01Guest
comp cam 595/609 112 lobe horrible city still pretty good highway just stick it in 6th and cruze.
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09-09-2005, 01:08 PM #6
hey sarge what kind of power are you puting down with ur heads and cam??i was thinking with going with that setup
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09-09-2005, 09:10 PM #7BlackHawk T/AGuest
Also note a higher stall will affect your gas mileage too - often done with a cam (if A4).
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09-09-2005, 09:46 PM #8Originally Posted by outlawz01
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09-10-2005, 04:40 AM #9
- Join Date
- Aug 2005
- Location
- any where but here
- Posts
- 142
AFR 205 heads
Comp Cam 220ish & 532ish (mild) & (borrowed the ish denotation from Sarge)
114 LSA
A4 w/ stock torque converter (Think it's 1,800 RPM?)
16-18 MPG generally unless I'm leadfooting it.
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09-10-2005, 08:40 AM #10
- Join Date
- Aug 2005
- Location
- Texas Department of Corrections
- Posts
- 18,128
- Retired Outlaw Sum Bitch
Originally Posted by Irman393
With the new Nitrous...well over 500RWHP....
I do not want to mislead nor set any false expectations....I have a helluva lot more than Heads/Cam....Balanced crank/LSX Intake/KN CAI/Shaner TB/SW LT Headers/RT Cats/Borla Performance Exhaust/Valves/Springs/Rods etc. etc. And of course a dyno tune by the best in the business...Tracy at FIS....all that going through a TransGo shift kit/PI 3200 Stall/Harrop finally to Nitto Drag Radials....
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09-10-2005, 09:54 AM #11
- Join Date
- Dec 2002
- Location
- n/w chicago
- Age
- 54
- Posts
- 6,932
black- 2000 nhra edition formula
Originally Posted by BlackHawk T/A2000 nhra edition formula
a few bolt ons, 379 rwhp
11.96 @113.25
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09-10-2005, 10:22 AM #12outlawz01Guest
Oh my bad. I put down 411/424. On a shitty tune. Hopefully i will get it tuned soon.
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09-24-2005, 10:58 AM #13
- Join Date
- Sep 2005
- Location
- Fort Stockton, Tx
- Age
- 42
- Posts
- 39
Blue- 2000 Z-28
MTI Stage 2 heads
MTI X1 Cam- 591/571 230/227 112 lobe separation
3500 Stall
city 13-16
highway 19-22
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09-24-2005, 12:58 PM #14Rhino21149Guest
Fuel Econmy tests on modified LS
I have two modified LS engine cars.
98 Camaro with 408 iron-block with big-port AFR heads, 11.25:1, 250ish deg cam, lift about .65, 113 deg sep; headers, cats and mufflers, good tune, 490/522 RWHP on fuel alone with cutouts closed/open,.
Fuel usaghe about 14 around town, 22-24 on the highway.
02 Z06: We've actually gone to some effort to test this carefully.
Engine: 427 C5R block, Patriot III heads with porting+polishing by Justin (flow 342 on intake), 225/232 deg cam with .594 lift, FAST90mm, 1 7/8 long tube headers, big cats, 3" exhaust, etc., and D1SC SC set for mild boost (5 lbs),
Very good tune for driveability and low-end torque. Max 565 RWHP/544RWT with cutouts closed, 595/550 with them open.
Around town I get about 19, on the highway, generally 25.
It gets very good mileage because it is a pretty mild cam for such a big engine.
Fuel Economy, by actual test, two way, using the cars "Avg Fuel Econmy" feature over 3 and 5 mile sections, two way average (usually several two-way runs averaged, except the 125 mph run, done only once).
MPH W AC off W AC on
20 18 14
35 26 25
40 30 27-28
60 29 26-27
75 26 24
85 21 19
100 19 17
125 15 13-14
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10-06-2005, 07:40 PM #15
Check these links out for a good understanding of whats involved for good aspiration for your desired applications.
http://www.compcams.com/catalog/
http://chevyhiperformance.com/techarticles/86218/
http://www.themotorbookstore.com/ls1...8-engines.html
http://www.motorsporttech.com/fbody_engine01.asp
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