How high can I rev it? - The Saab Link Forums

Go Back   The Saab Link Forums > Saab NG900 '94-'98 and 9-3 '99-'02 Forum > Performance Modifications for the NG900 / Old 9-3

Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

SaabLink.net is the premier Saab Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools
Old 06-17-2008, 10:37 AM   #1
Flirting With TSL Addiction
 
Join Date: Jan 2007
Location: Boise/Lewiston,ID
Posts: 559
How high can I rev it?

I went to the track last weekend and found myself pushing my 3rd gear as hard as possible up to nearly 7k limit because it was at the very end of the strip. I havenít had a chance to dig out my dyno sheet to see where my power ends to see if i was actually losing power. But I was just wondering how unsafe this is to do?

can a b204l head really take this much abuse? and cause no floating valves?



I got really scared because that day a built +400whp integra had a exhaust valve that floated and broke apart his spring and know most of the top end is toast. he was going up to 9k rpm though....
__________________
99 saab 9-3
stg4
rear anti sway bar
GS stuff
oil leak
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
squarl is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 06-17-2008, 10:44 AM   #2
Elder
 
Join Date: Nov 2005
Location: MI
Posts: 10,066
Send a message via AIM to Jameson
Your car likely has peak power at 5500-5800. I would not rev to close to 7k, my stage 4 Vig has seen 6400 a couple of times but not intentionally.

7k, you would likely want T-5 cams, and a higher puffing turbo to make use of the power higher.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Jameson is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 06-17-2008, 10:45 AM   #3
JZW
Elder
 
Join Date: Oct 2006
Location: Boulder Colorado
Posts: 3,153
I have been running my head to 7k for a couple of years now, but I recently put in the stiffer valve springs from Nick.

You are definetely not making peak power up there. Even with my gt3071 .64ar and stock cams, I was starting to fall off at 5700rpm in third gear. I went faster in the 1/4 mile by short shifting, shifting at 5700rpm instead of winding it all the way out to 7k.

When you feel the torque and power start to fall off, shift! The nose will even start to drop on you...

John
__________________
b234r ng900, E-85 Holset Super [email protected] mph a mile high 645whp/650wtrq Sae Denver
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
JZW is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
 
Old 06-17-2008, 10:47 AM   #4
JK
Elder
 
JK's Avatar
 
Join Date: Sep 2005
Location: Land of 10,000 L-holes
Posts: 13,686
Every dyno I have ever had showed my car making peak power right when they shut down at 6500rpm. This is 3 different setups that have all produced pretty much the same result!

I don't know if my car is a fluke or what.

Torque peak always drops off, but hp just keeps going up!
__________________
always a SAAB guy at heart
JK is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 06-17-2008, 10:51 AM   #5
Nick Taliaferro
Elder
 
GenuineSaab's Avatar
 
Join Date: Feb 2004
Location: Springfield, MO USA
Posts: 3,232
Send a message via MSN to GenuineSaab Send a message via Skype™ to GenuineSaab
Just remember wear accelerates with higher revs.. The stock pistons dont really like that much speed. On a 2.0 it is not that much of a problem though.. I turn my Vig to 7200 but that same piston speed with the shorter 2.0 crank is like 8500! So it is less of a problem on the 2.0, now that is ignoring power. actually getting enough torque (airflow) up there is the hard part.
__________________
Nicholas Taliaferro

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
|
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
|
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
GenuineSaab is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 06-17-2008, 11:25 AM   #6
Flirting With TSL Addiction
 
Join Date: Jan 2007
Location: Boise/Lewiston,ID
Posts: 559
I wasnt reving out my engine for power, I know that the trq falls pretty hard around 6k, I was reving it out so that when I shifted id be right back into my trq band.
__________________
99 saab 9-3
stg4
rear anti sway bar
GS stuff
oil leak
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
squarl is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 06-17-2008, 11:39 AM   #7
JZW
Elder
 
Join Date: Oct 2006
Location: Boulder Colorado
Posts: 3,153
You want to shift right after the torque falls off and the hp takes over. Lookin at you're dyno sheet will show you exactly where that is in the rpm, but you can also feel it when the torque starts to fall..

Look at my dyno, check where the torque line falls below the hp line and that is right about where you would want to shift and were you will go the fastest.

On my dyno graph with gt3071 .64ar stock cams, I would shift at 5500rpm here where you see the hp take over after the torque has dropped below the hp line...

John
Attached Images
File Type: jpg gt3071r1.JPG (37.4 KB, 17 views)
__________________
b234r ng900, E-85 Holset Super [email protected] mph a mile high 645whp/650wtrq Sae Denver
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
JZW is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 06-17-2008, 11:40 AM   #8
JK
Elder
 
JK's Avatar
 
Join Date: Sep 2005
Location: Land of 10,000 L-holes
Posts: 13,686
The only reason I'll rev mine out would be in a situation where shifting would cost me more time than bouncing off the rev limiter. This last weekend's autocross was an excellent example of that for me - very tight, too tight for a 9000.
__________________
always a SAAB guy at heart
JK is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 06-18-2008, 08:07 PM   #9
JZW
Elder
 
Join Date: Oct 2006
Location: Boulder Colorado
Posts: 3,153
Yup, that is one time you do want to keep winding it out and if you need to keep winding it another 500rpm so that you drop right back into the sweet spot of you're power band, then that is well worth it...

I wind second as far as I can even though I am just cruising after 6500rpm and that way I fall back to my sweet spot in third gear. If I shift too early, the wait time for spool kills my speed.

John
__________________
b234r ng900, E-85 Holset Super [email protected] mph a mile high 645whp/650wtrq Sae Denver
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
JZW is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 06-19-2008, 02:47 AM   #10
Live, eat, and sleep by TSL
 
Join Date: May 2004
Posts: 1,122
Quote:
Originally Posted by JZW View Post
Yup, that is one time you do want to keep winding it out and if you need to keep winding it another 500rpm so that you drop right back into the sweet spot of you're power band, then that is well worth it...

I wind second as far as I can even though I am just cruising after 6500rpm and that way I fall back to my sweet spot in third gear. If I shift too early, the wait time for spool kills my speed.

John

bear in mind also that the gear-ratio is a multiplier for torque and the it needs to really fall on its face in the engine if you want to end up in a situation where the wheeltq would be larger in the next gear up.
Look into this tread where you can see the values calucalated
https://www.saablink.net/forum/showthread.php?t=28363
Vigge is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the The Saab Link Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Vehicle Info.
Enter your vehicle information (year, model, mods)
Insurance
Please select your insurance company (Optional)

Log-in


Thread Tools

Posting Rules
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 06:18 PM.


Powered by vBulletin® Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Friendly URLs by vBSEO 3.5.2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
All content is copyright © The Saab Link and it's original authors.


 

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.