L67 and 3.4 Pulley - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 07-28-2010, 12:37 AM   #11
Senior Member
True Car Nut
 
Jonpro03's Avatar
 
Join Date: Jul 2010
Location: Danville, Illinois
Posts: 2,469
Thanks: 0
Thanked 0 Times in 0 Posts
Jonpro03 is on a distinguished road
Default

Andrei, have you considered running e85?

I thought about just adding 20% more fuel and using e85.
Jonpro03 is offline   Reply With Quote
Old 07-28-2010, 12:47 AM   #12
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Quote:
Originally Posted by Jonpro03 View Post
Andrei, have you considered running e85?

I thought about just adding 20% more fuel and using e85.
There are other problems with that. I'd like to run everything on pump gas.
xtremerevolution is offline   Reply With Quote
Old 07-28-2010, 04:49 AM   #13
Senior Member
Posts like a Northstar
 
RobertISaar's Avatar
 
Join Date: Jul 2010
Location: Camden, MI
Posts: 615
Thanks: 0
Thanked 0 Times in 0 Posts
RobertISaar is on a distinguished road
Default

e85 is more than 20%... 48.7% by my count...

pure gasoline has a stoich AFR of 14.64:1, compared to the 9.846:1 that E85 is stoichiometric at.
RobertISaar is offline   Reply With Quote
Old 07-28-2010, 07:42 AM   #14
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Let'* take a step back and weigh options. I've said quite a few times that I considered a front Plog to be "poor man headers". The rear S2 manifold is very free flowing and any porting to it is minimal at best. If the stock S2 manifold would work for you, I'd seriously consider a 2.5" or 3" downpipe with that setup. The largest difference would be reasonably small. And unless you were to build a huge motor, it should be fine for a 3.4 setup.

Running perfectly is all relative. A car that is tuned in August runs great in the summer heat. A car that'* tuned any other time of the year runs good at that time. My suggestion would be to have a tune for each season if you plan on running all year. That and constant tuning is how you have a dialed in tune.

Gotta go back to see if you plan rockers. Once the front manifold restriction is gone (and U bend on W bodies) then the exhaust is relatively unrestricted. The biggest restriction at that point is flow through the heads. Either adding rockers or a cam helps, getting ported heads with larger valves really makes power. And heck.. cooler air from a Gen V or turbo would be nice long before heads.

Dan..that GP with 5 degrees either needed a tune or there was a mechanical issue.
BillBoost37 is offline   Reply With Quote
Old 07-28-2010, 08:10 AM   #15
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

I did Tune it Bill, he had to run low timing. He'* now cammed and a S2 intercooler and running a 3.1 pulley with about 16* timing. His engine just seems to not like timing.
Danthurs is offline   Reply With Quote
Old 07-28-2010, 01:20 PM   #16
Senior Member
True Car Nut
 
SAMzGXP's Avatar
 
Join Date: Mar 2009
Location: Fort crack homie
Posts: 2,894
Thanks: 0
Thanked 0 Times in 0 Posts
SAMzGXP is on a distinguished road
Default

i was running a 3.4 on my GP without headers or plog, and i was fine for a long time even sold it with that setup.. usually you shouldnt need headers for running a 3.4 on an L67 with a 3" DP you shouldnt face any problems, but as they mentioned before having NA bottom end could be alittle risky since you have a higher compression ratio to start with, so i would go with a 3.5 if you're cant fit the headers in

as for the 3.5 i might have one for sale left from my GP parts but only problem its MPS
SAMzGXP is offline   Reply With Quote
Old 07-28-2010, 01:37 PM   #17
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Quote:
Originally Posted by SAMzGXP View Post
i was running a 3.4 on my GP without headers or plog, and i was fine for a long time even sold it with that setup.. usually you shouldnt need headers for running a 3.4 on an L67 with a 3" DP you shouldnt face any problems, but as they mentioned before having NA bottom end could be alittle risky since you have a higher compression ratio to start with, so i would go with a 3.5 if you're cant fit the headers in

as for the 3.5 i might have one for sale left from my GP parts but only problem its MPS
My Bottom end isn't N/A, that'* Jon'* motor. My engine is a 2000 L67 from the bottom up.

Where do I get said powerlog? Is anyone selling one anywhere, or do I have to buy it from someone? Am I understanding it right that the front powerlog alone, with the rest of my planned modifications, would allow me to run the 3.4?

At this point I'd like to send the headers to Milzy Motorsports for a quote on what it would cost to have them modified, and then decide what to do from there. If its too expensive, I may just sell them and get a front powerlog, if everyone is saying that it would help significantly.
xtremerevolution is offline   Reply With Quote
Old 07-28-2010, 01:38 PM   #18
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Oh and another thing, i have to pay someone to make me a 3" downpipe for a 1st gen w-body, since nobody makes them. My understanding is that it would cost me ~$150 to have someone make one. The problem here is that it would cost me another ~$150 to get a powerlog, and the rough estimate so far for modifying the headers is $250-$300.
xtremerevolution is offline   Reply With Quote
Old 07-28-2010, 02:13 PM   #19
Senior Member
True Car Nut
 
SAMzGXP's Avatar
 
Join Date: Mar 2009
Location: Fort crack homie
Posts: 2,894
Thanks: 0
Thanked 0 Times in 0 Posts
SAMzGXP is on a distinguished road
Default

ops, sorry my bad.. didnt pay attention

k so you have an L67? if i were you i wouldnt even bother with the headers or Plog for a 3.4
what i would do i would install the 3.4, tune and scan
Plog would help a bit but its not a must.. most guys on gpona dont touch their exhaust mani with a 3.4 pulley, if you're running a 3.4 just install an intake, 180 stat, 3" DP and colder spark plugs would help alot.. and tune according to that.. at the end every engine is different.. mod and SCAN always SCAN

and i also might have a plog for sale i have to look in my garage.. if i do ill let you know..
SAMzGXP is offline   Reply With Quote
Old 07-28-2010, 02:53 PM   #20
Senior Member
True Car Nut
Thread Starter
 
xtremerevolution's Avatar
 
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road
Default

Quote:
Originally Posted by SAMzGXP View Post
ops, sorry my bad.. didnt pay attention

k so you have an L67? if i were you i wouldnt even bother with the headers or Plog for a 3.4
what i would do i would install the 3.4, tune and scan
Plog would help a bit but its not a must.. most guys on gpona dont touch their exhaust mani with a 3.4 pulley, if you're running a 3.4 just install an intake, 180 stat, 3" DP and colder spark plugs would help alot.. and tune according to that.. at the end every engine is different.. mod and SCAN always SCAN

and i also might have a plog for sale i have to look in my garage.. if i do ill let you know..
If you could please look quickly, I'd very much appreciate it. My time is sorta running out, lol.
xtremerevolution is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Need supercharger pulley route layout and pulley part number Allmachtige 1992-1999 1 10-05-2006 09:31 PM
Differences between a S1 L67 TB and S2 L67 TB? Mortehl Forced Induction 6 02-03-2006 12:50 AM
Series 2 L67 Engine cover on a Series 1 L67? DJ SHO Performance, Brainstorming & Tuning 7 07-19-2004 04:39 PM
First 04 MC SS kill? L67 II vs. L67 I! willwren General GM Chat 20 11-15-2003 07:48 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:40 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.