Dyno results - Page 3 - 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 02-28-2005, 09:37 AM   #21
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

How do dynos measure RPM? Do they clamp onto a spark plug wire and use induction? If so, our spark plugs fire every revolution. I don't actually know if most newer cars are that way, but I dont' think it'* uncommon. Maybe it doesn't take that into account.
J Wikoff is offline   Reply With Quote
Old 02-28-2005, 10:14 AM   #22
Senior Member
True Car Nut
Thread Starter
 
toastedoats's Avatar
 
Join Date: Sep 2004
Location: Fitchburg Ma _ToastedRice_
Posts: 6,837
Thanks: 0
Thanked 0 Times in 0 Posts
toastedoats is on a distinguished road
Default

they did induction off of #1 wire
toastedoats is offline   Reply With Quote
Old 02-28-2005, 11:18 AM   #23
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

I'd say multiply that torque number by 2 then... 91 is just tooo whimpy... 182Ft Lbs sounds a bit better....


Does that sound right for the drivetrain loss... 230ft lbs to 182 ft lbs ?

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
Old 02-28-2005, 11:39 AM   #24
Senior Member
Certified Car Nut
 
Join Date: Jun 2003
Posts: 15,928
Thanks: 0
Thanked 0 Times in 0 Posts
BonneMeMN is on a distinguished road
Default Re: Dyno results

Quote:
Originally Posted by toastedoats
145.06whp @ 4200
91.62wtq @ 4100

Doesnt that seem a little screwy?
It'* still wrong. HP = ( Torque x RPM)/5250 Lets use the first figure...

145.06 HP = (116.048 ft/lb X 4200) / 5250

116lb/ft is higher the 91.62 as well, and there'* no way your car is making peak torque above 4200 RPM either. This figure seems low for low RPMs even if we start dividing and such
BonneMeMN is offline   Reply With Quote
Old 02-28-2005, 11:40 AM   #25
Senior Member
True Car Nut
 
Join Date: May 2003
Location: Holt, MI & Lima, OH
Posts: 3,022
Thanks: 0
Thanked 0 Times in 0 Posts
dbtk2 is on a distinguished road
Default

Well, it is quite obvious the rpm isn't right since peak power and peak torque come at pretty much the same exact time, and its way too low for peak hp. (4100 and 4200) The hp number seems right, but the rpms don't. Do you have the chart? If hp & tq. don't cross at 5252rpm then there is obviously something wrong. If the rpm is off, the hp should still be the same the torque will just read different. I would bet you have to double the torque numbers.

Quote:
there is no way that a 3.8 with IC, heads and a cam only makes 312hp
Someones never been on ClubGP apparantly. There are many people with cam/heads/IC only making 312whp. Thats 390 crank hp. I'm not saying those numbers are right, because they probably aren't. But without tuning its pretty easy to not make a lot of power. For instance, take a look at this clubgp post. Its the hp records for each cam, go down and look at the Stage 2 cam, the second person on there. Yeah, I understand this is a smaller cam, but as an example. Stage 2 cam/heads/IC. And I'm pretty sure this was a well tuned car as well. So a little tuning on this car that only made 312 that we are talking about might have helped it. Or the dyno was off, you never know.

http://www.clubgp.com/newforum/tm.as...mode=1&smode=1

Shawn
dbtk2 is offline   Reply With Quote
Old 02-28-2005, 12:02 PM   #26
Senior Member
True Car Nut
 
Join Date: Jan 2004
Location: Lakeville, MN
Posts: 4,328
Thanks: 0
Thanked 1 Time in 1 Post
fantastic88 is on a distinguished road
Default

Quote:
If so, our spark plugs fire every revolution.
Yes, thats the reason they gave me that it said I was turning 12,000 RPM. Just double you're torque numbers.
fantastic88 is offline   Reply With Quote
Old 02-28-2005, 12:23 PM   #27
Senior Member
True Car Nut
 
Join Date: Jan 2004
Location: Lakeville, MN
Posts: 4,328
Thanks: 0
Thanked 1 Time in 1 Post
fantastic88 is on a distinguished road
Default

http://tinypic.com/1h9t1k

Heres mine. Notice the RPMs are doubled?
fantastic88 is offline   Reply With Quote
Old 02-28-2005, 12:29 PM   #28
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default Re: Dyno results

Quote:
Originally Posted by BonneMeMN
Quote:
Originally Posted by toastedoats
145.06whp @ 4200
91.62wtq @ 4100

Doesnt that seem a little screwy?
It'* still wrong. HP = ( Torque x RPM)/5250 Lets use the first figure...

145.06 HP = (116.048 ft/lb X 4200) / 5250

116lb/ft is higher the 91.62 as well, and there'* no way your car is making peak torque above 4200 RPM either. This figure seems low for low RPMs even if we start dividing and such
145.06 HP = (181.325 ft/lb X 4200) / 5250

That sounds a lot better.
J Wikoff is offline   Reply With Quote
Old 02-28-2005, 01:25 PM   #29
Senior Member
Certified Car Nut
 
Join Date: Jun 2003
Posts: 15,928
Thanks: 0
Thanked 0 Times in 0 Posts
BonneMeMN is on a distinguished road
Default Re: Dyno results

Quote:
Originally Posted by jwikoff99
Quote:
low for low RPMs even if we start dividing and such
145.06 HP = (181.325 ft/lb X 4200) / 5250

That sounds a lot better.
Oye, that'* what I get for using the damn computer calculator instead of the Trusty Ti, or a paper...

Dumb question, it'* a 4 stroke motor, so it takes two revolutions to doa full cycle, why is the spark plug firing every rev? Because of the matching cylinder on the ignition coil?
BonneMeMN is offline   Reply With Quote
Old 02-28-2005, 01:30 PM   #30
BANNED
 
Join Date: Aug 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
banned3800 is on a distinguished road
Default

Something like that... GM DIS uses a waste spark method... The coil actually fires both plugs at the same time... The cylinder on the compression stroke requires more power to fire the plug, the opposing cylinder requires a lot less power to fire the plug, hence sending more of the power to the plug on the compression stroke...

Did I even explain that right

It works something like that....<---- To lazy to look it up...lol

__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
banned3800 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
torque curves or dyno results from 3.5? LittleHoov Bonneville GXP/ Northstar Powered Cars 7 10-07-2005 01:12 AM
Drove a Turbo 04 GTP Comp G today - Updated Dyno results Pg2 Foghorn General GM Chat 30 08-21-2005 04:22 PM
1995 SSEi dyno results!!!! SSEi95 Performance, Brainstorming & Tuning 20 05-11-2005 11:49 PM
Dyno Results= Awsome!! fantastic88 Performance, Brainstorming & Tuning 19 01-30-2005 05:55 PM
Dyno Results ixlr8 Performance, Brainstorming & Tuning 12 12-06-2002 10:51 AM


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 09:03 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.