Dynoed Vette today
Racer
Joined: Oct 2009
Posts: 433
Likes: 55
From: The Beautiful Pacific Northwest
What are your current mods.... with that much torque I imagine it is an L98??
Jared
Last edited by lotsofspareparts; Apr 30, 2019 at 02:42 AM.
Thread Starter
Racer
Joined: May 2009
Posts: 364
Likes: 3
From: merced ca
I have the superram, AFR 180 heads with 64 cc chambers, long tube headers, lingenfelter 211/219 cam, scorpion 1.6 roller rockers and Borla catback. Also the pistons are flattops. Wishing I would’ve went with the 219/219 cam but at the time I didn’t have the superram. Don’t know why but really think it should be making more power then that. My fuel ratio runs 12.5-12.8 by the wideband. My total timing is only 29.18 in my tune but more than that and the ecm will pull timing. I’m wondering though if I can run higher ignition timing in the mid range and bring it down on the top end, it only pulled timing at redline. I have my total timing of 29.18 in by 2800 rpms.
Last edited by kitttransam; Apr 30, 2019 at 09:01 AM.
Racer
Joined: Oct 2009
Posts: 433
Likes: 55
From: The Beautiful Pacific Northwest
I have the superram, AFR 180 heads with 64 cc chambers, long tube headers, lingenfelter 211/219 cam, scorpion 1.6 roller rockers and Borla catback. Also the pistons are flattops. Wishing I would’ve went with the 219/219 cam but at the time I didn’t have the superram. Don’t know why but really think it should be making more power then that. My fuel ratio runs 12.5-12.8 by the wideband. My total timing is only 29.18 in my tune but more than that and the ecm will pull timing. I’m wondering though if I can run higher ignition timing in the mid range and bring it down on the top end, it only pulled timing at redline. I have my total timing of 29.18 in by 2800 rpms.
Jared
Safety Car
Joined: Apr 2005
Posts: 3,624
Likes: 431
From: Dale City VA
Honestly the power numbers are about right for a 350 with those heads, intake and camshaft..... A4 and stall converter can eat up some power. Also that's a bit generous because the Dyno's Correction Factor is set to STD not SAE.....
What about your exhaust set up? Still Y Pipes and single converter? Headers?
I built a mild 383 Super Ram, old style AFR 195s, LPE 219 cam for a 91 few years ago and it made like 340RWHP and 400RWTQ on a Land and Seas chassis dyno.... the car still had the y pipe and stock single converter..... We were kinda disappointed but it was what it was...... After we converted the car's exhaust to a 92-96 LT1 dual exhaust and Hooker long tubes.... it seemd to run much stronger. Re-Dyno'd it and sure enough, it made 390 and 440.....
Will
What about your exhaust set up? Still Y Pipes and single converter? Headers?
I built a mild 383 Super Ram, old style AFR 195s, LPE 219 cam for a 91 few years ago and it made like 340RWHP and 400RWTQ on a Land and Seas chassis dyno.... the car still had the y pipe and stock single converter..... We were kinda disappointed but it was what it was...... After we converted the car's exhaust to a 92-96 LT1 dual exhaust and Hooker long tubes.... it seemd to run much stronger. Re-Dyno'd it and sure enough, it made 390 and 440.....
Will
Last edited by rklessdriver; Apr 30, 2019 at 12:45 PM.
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Melting Slicks
Joined: Apr 2007
Posts: 2,616
Likes: 111
Honestly the power numbers are about right for a 350 with those heads, intake and camshaft..... A4 and stall converter can eat up some power. Also that's a bit generous because the Dyno's Correction Factor is set to STD not SAE.....
What about your exhaust set up? Still Y Pipes and single converter? Headers?
I built a mild 383 Super Ram, old style AFR 195s, LPE 219 cam for a 91 few years ago and it made like 340RWHP and 400RWTQ on a Land and Seas chassis dyno.... the car still had the y pipe and stock single converter..... We were kinda disappointed but it was what it was...... After we converted the car's exhaust to a 92-96 LT1 dual exhaust and Hooker long tubes.... it seemd to run much stronger. Re-Dyno'd it and sure enough, it made 390 and 440.....
Will
What about your exhaust set up? Still Y Pipes and single converter? Headers?
I built a mild 383 Super Ram, old style AFR 195s, LPE 219 cam for a 91 few years ago and it made like 340RWHP and 400RWTQ on a Land and Seas chassis dyno.... the car still had the y pipe and stock single converter..... We were kinda disappointed but it was what it was...... After we converted the car's exhaust to a 92-96 LT1 dual exhaust and Hooker long tubes.... it seemd to run much stronger. Re-Dyno'd it and sure enough, it made 390 and 440.....
Will
I agree. I ran similar numbers with AFR 187 heads, ZZ9 roller/Edelbrock hi flow runners..In fact the numbers were about spot on....and I had a 355 cube rebuild....now when I went to the miniram, that’s when life changed!
Having said that...agree with other comments too...more timing..mine liked 36 degrees at WOT...that’s pretty much pushing it though....lean it out to 13.5:1 at WOT...you will see a few more ponies.....
that RWTQ is very nice ....thanks for sharing!
Thread Starter
Racer
Joined: May 2009
Posts: 364
Likes: 3
From: merced ca
Honestly the power numbers are about right for a 350 with those heads, intake and camshaft..... A4 and stall converter can eat up some power. Also that's a bit generous because the Dyno's Correction Factor is set to STD not SAE.....
What about your exhaust set up? Still Y Pipes and single converter? Headers?
I built a mild 383 Super Ram, old style AFR 195s, LPE 219 cam for a 91 few years ago and it made like 340RWHP and 400RWTQ on a Land and Seas chassis dyno.... the car still had the y pipe and stock single converter..... We were kinda disappointed but it was what it was...... After we converted the car's exhaust to a 92-96 LT1 dual exhaust and Hooker long tubes.... it seemd to run much stronger. Re-Dyno'd it and sure enough, it made 390 and 440.....
Will
What about your exhaust set up? Still Y Pipes and single converter? Headers?
I built a mild 383 Super Ram, old style AFR 195s, LPE 219 cam for a 91 few years ago and it made like 340RWHP and 400RWTQ on a Land and Seas chassis dyno.... the car still had the y pipe and stock single converter..... We were kinda disappointed but it was what it was...... After we converted the car's exhaust to a 92-96 LT1 dual exhaust and Hooker long tubes.... it seemd to run much stronger. Re-Dyno'd it and sure enough, it made 390 and 440.....
Will
Thread Starter
Racer
Joined: May 2009
Posts: 364
Likes: 3
From: merced ca
I agree. I ran similar numbers with AFR 187 heads, ZZ9 roller/Edelbrock hi flow runners..In fact the numbers were about spot on....and I had a 355 cube rebuild....now when I went to the miniram, that’s when life changed!
Having said that...agree with other comments too...more timing..mine liked 36 degrees at WOT...that’s pretty much pushing it though....lean it out to 13.5:1 at WOT...you will see a few more ponies.....
that RWTQ is very nice ....thanks for sharing!
Having said that...agree with other comments too...more timing..mine liked 36 degrees at WOT...that’s pretty much pushing it though....lean it out to 13.5:1 at WOT...you will see a few more ponies.....
that RWTQ is very nice ....thanks for sharing!
Le Mans Master
Joined: Mar 2006
Posts: 5,775
Likes: 585
From: Texas
With that amount of torque and the hp dropping off that fast, I'm thinking the stock y-pipe is your restriction. You're certainly hitting your peak torque really low - not counting that weird torque converter bump, your peak torque is happening around 2500 rpm, really low with that cam and head combo, even with the super ram. I'm leaning towards an exhaust restriction.
Safety Car
Joined: Apr 2005
Posts: 3,624
Likes: 431
From: Dale City VA
https://i50.photobucket.com/albums/f...d/Noland91.jpg
Now the exhaust change helped out quite a bit with power production but power still leveled off flat from 5000RPM on up..... The car still runs well, has a lot of power and is pretty fast on the street.
Will
Last edited by rklessdriver; Apr 30, 2019 at 04:13 PM.
Thread Starter
Racer
Joined: May 2009
Posts: 364
Likes: 3
From: merced ca
With that amount of torque and the hp dropping off that fast, I'm thinking the stock y-pipe is your restriction. You're certainly hitting your peak torque really low - not counting that weird torque converter bump, your peak torque is happening around 2500 rpm, really low with that cam and head combo, even with the super ram. I'm leaning towards an exhaust restriction.
Drifting
Joined: Jun 2018
Posts: 1,678
Likes: 229
From: Michigan
Don't be..... It's quite common. The 91 383 I built using the LPE 219 cam, actually made peak power 4800 and then flattened out to about 5500RPM with the single cat and Y Pipe exhaust system in place......
https://i50.photobucket.com/albums/f...d/Noland91.jpg
Now the exhaust change helped out quite a bit with power production but power still leveled off flat from 5000RPM on up..... The car still runs well, has a lot of power and is pretty fast on the street.
Will
https://i50.photobucket.com/albums/f...d/Noland91.jpg
Now the exhaust change helped out quite a bit with power production but power still leveled off flat from 5000RPM on up..... The car still runs well, has a lot of power and is pretty fast on the street.
Will
Melting Slicks
Joined: Apr 2007
Posts: 2,616
Likes: 111
At WOT; optimum AFR is 14:7 under normal driving/idle conditions. But you can't be that lean at WOT; you would have detonation in some cases and possibly running hot.
Le Mans Master
Joined: Mar 2006
Posts: 5,775
Likes: 585
From: Texas
Can you run a larger diameter y-pipe? Burns Stainless has larger diameter y-pipes, or if ground clearance is an issue, they have oval tubing as well that you could have fabbed up into a high flow y-pipe.
Thread Starter
Racer
Joined: May 2009
Posts: 364
Likes: 3
From: merced ca
As far as I know the original was 2.25. I bought an aftermarket 2.5 inch and hacked it up for my headers. I know tpis makes a 3 inch. I just burned a chip last night. I got my timing to come in at 32 by 2800 but brought it down to 29 past 4800. So far no knock counts. Also leaned out my afr got it at 12.8. My butt dyno is saying I gained something. Going to play with it again and see.