4T80E/Turbo-S/C... TIME FOR A NEW THREAD? - Page 37 - 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 12-21-2007, 11:23 PM   #361
Senior Member
Posts like a Corvette
 
Join Date: Mar 2005
Location: Frederick, Maryland
Posts: 1,441
Thanks: 0
Thanked 0 Times in 0 Posts
VigCS is on a distinguished road
Default

Nice numbers! But it looks like you may have some valve train stability issues...

Definitely a kick *** build.
VigCS is offline   Reply With Quote
Old 12-22-2007, 03:53 AM   #362
Junior Member
 
Join Date: Jun 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
2000SilverBullet is on a distinguished road
Default

Quote:
2000SilverBullet wrote:

it'* still better. It'* not always about peak horsepower that makes it better.

Like lower weight, lower center or gravity, dry sump oiling...

Oh wait

No to mention the whole aspect of RWD, performance gearing, 6 speeds...
Like just as quick with 700 more lbs and 3 more passengers.

Like 15 cu ft more luggage space.
Like lower insurance rates.

Like the feeling of pulling away from a corvette as it sleeps at the lights not expecting a family luxury sedan to own it, Been there. Done that. :P
2000SilverBullet is offline   Reply With Quote
Old 12-22-2007, 05:13 AM   #363
Senior Member
True Car Nut
 
radomirthegreat's Avatar
 
Join Date: Sep 2006
Location: Indianapolis, IN
Posts: 4,606
Thanks: 0
Thanked 0 Times in 0 Posts
radomirthegreat is on a distinguished road
Default

We'll actually never know if Jeff could take Corvettes on the highway.
I request BC-acceptable videos!
radomirthegreat is offline   Reply With Quote
Old 12-22-2007, 11:37 AM   #364
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jan 2005
Location: Atlanta, GA. USA
Posts: 368
Thanks: 0
Thanked 0 Times in 0 Posts
pontiacjeff is on a distinguished road
Default

Quote:
Originally Posted by VigCS
Nice numbers! But it looks like you may have some valve train stability issues...

Definitely a kick A$$ build.
Why do you say that? Is there somthing in the graph? If you are referring to the dip at 5500, that'* the point where the KS finally reduced total timing to dismal 3deg.
pontiacjeff is offline   Reply With Quote
Old 12-22-2007, 12:05 PM   #365
Senior Member
Posts like a Corvette
 
Join Date: Mar 2005
Location: Frederick, Maryland
Posts: 1,441
Thanks: 0
Thanked 0 Times in 0 Posts
VigCS is on a distinguished road
Default

Quote:
Originally Posted by pontiacjeff
Quote:
Originally Posted by VigCS
Nice numbers! But it looks like you may have some valve train stability issues...

Definitely a kick A$$ build.
Why do you say that? Is there something in the graph? If you are referring to the dip at 5500, that'* the point where the KS finally reduced total timing to dismal 3deg.
It may be different for GMs, but usually when a dyno chart is kind of jagged (for lack of a better word) like that it signifies some valve train instability...for Fords at least.

Nevertheless, I'm not trying to knock you down because they're definitely some nice numbers and one hell of an ambitious project!
VigCS is offline   Reply With Quote
Old 12-22-2007, 12:17 PM   #366
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jan 2005
Location: Atlanta, GA. USA
Posts: 368
Thanks: 0
Thanked 0 Times in 0 Posts
pontiacjeff is on a distinguished road
Default

Quote:
Originally Posted by VigCS
Quote:
Originally Posted by pontiacjeff
Quote:
Originally Posted by VigCS
Nice numbers! But it looks like you may have some valve train stability issues...

Definitely a kick A$$ build.
Why do you say that? Is there something in the graph? If you are referring to the dip at 5500, that'* the point where the KS finally reduced total timing to dismal 3deg.
It may be different for GMs, but usually when a dyno chart is kind of jagged (for lack of a better word) like that it signifies some valve train instability...for Fords at least.

Nevertheless, I'm not trying to knock you down because they're definitely some nice numbers and one H*** of an ambitious project!
Oh, i think this is a case of bad timing advance. A good dyno run will usually be much smoother.
pontiacjeff is offline   Reply With Quote
Old 12-22-2007, 04:42 PM   #367
Senior Member
Posts like a Corvette
 
Join Date: Mar 2005
Location: Frederick, Maryland
Posts: 1,441
Thanks: 0
Thanked 0 Times in 0 Posts
VigCS is on a distinguished road
Default

Good deal.
VigCS is offline   Reply With Quote
Old 12-28-2007, 03:37 PM   #368
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jan 2005
Location: Atlanta, GA. USA
Posts: 368
Thanks: 0
Thanked 0 Times in 0 Posts
pontiacjeff is on a distinguished road
Default

I am not having any luck with the TCM controlling the trans. I tried to scan it and get it to work on my emulator to no avail. It has all the power and ground it needs, but I get no MIL, no scan data across the serial data line, and no shift, it stays in 1st (better then staying in 4th) so I know it has power and goes into a limp mode b/c 1st gear is not a natural default, that would be 2nd. I might have connection issues...

But I hooked both sol wires to my Perf Shift (ground) switch, so I start in 2nd, get third (if the shifter is in 3rd (3) and then bump to 4th (D). I get a 2-4 if I leave it in D. I can;t imagine 1st gear with the 3.71 FDR. I might be looking to switch to the 3.11 ir something in b/t, there'* a 3.48 that might be nice. I only run 118 in 3rd and with the power I am making, might be running faster than that in the 1/4-mile. A 3.48 will give me about 130 to work with!

HEY! I just ran the numbers... I don;t think I have a 3.71! That would give me 125mph @ 6500. I was hitting the rev limiter on the dyno at 118! Could I possibly have the rare Eldo 4.10?!?!?!?!? I'm on the phone with my tranny guy right now.

The 3.71 would be over 125 @ 6500
pontiacjeff is offline   Reply With Quote
Old 12-28-2007, 08:28 PM   #369
Senior Member
Posts like a Turbo
Thread Starter
 
Join Date: Jan 2005
Location: Atlanta, GA. USA
Posts: 368
Thanks: 0
Thanked 0 Times in 0 Posts
pontiacjeff is on a distinguished road
Default

Well, I read somewhere on the net about a 4.0 FDR. I can't find anything about it or what models it was available in, but when I run the numbers, 6500rpm, 24.5" tire (measured on the car), 4.0FDR and 1:1 trans gear, I get 118.59mph. It hit 118 on the dyno at 6500! CRAP! a 4.0 is too low, really. I'll be shifting into 4th gear in the 1/4-mile! I guess that'* not the end of the world, with a 4.0, the actual final overdrive ratio is 2.73, not far off the 2.97 stock FDR in a 4T65E. And with 450+whp, it should pull just fine in 4th! What a holeshot it'* going to have when I finally get 1st gear up and running! LOL! it'll be only 40mph in 1st!

The bad thing about it is I made a 4 hr round trip this week and only got 18mpg on a full tank, 303 miles, 17 gallons. I am not locking the tq converter yet, so that might pick up 2 or 3mpg at the most. Still, that'* pretty dismal. But I guess to run in the 11'* and get 21mpg is not something most people can claim!
pontiacjeff is offline   Reply With Quote
Old 12-29-2007, 02:35 AM   #370
Senior Member
Posts like a Camaro
 
Join Date: Jun 2005
Posts: 1,108
Thanks: 0
Thanked 0 Times in 0 Posts
chadow427 is on a distinguished road
Default

Well, if you're pushin' 500+ at the wheels when she'* all tuned, that should be high 10'*, shouldn't it? I think BADSSEi was 514 whp, 10.7'*, or somethin' like that.
chadow427 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Thread locker vs. Thread sealant eazhar 1992-1999 3 03-23-2013 04:43 AM
Turbo L67 Ciera International.....and Turbo L36 S10 Bonneville92V688 Lounge 10 10-05-2007 03:43 PM
Transmission tuner for 4t80e sahensley Bonneville GXP/ Northstar Powered Cars 10 05-25-2005 07:07 PM
4t80e pbj General GM Chat 3 07-28-2003 06:23 AM
911 Twin Turbo vs. me w/ only ONE turbo Burgundy_Boat General GM Chat 11 06-28-2003 09:34 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 05:20 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.