Gto with a lq4 and 823 heads
10-15-2015, 09:09 AM
#1
Gto with a lq4 and 823 heads Hello everyone. It's been a couple years since I've been on here. After a several year hiatus and owning a 392 6speed challenger I'm back to owning a Ls powered vehicle. Well actually I've had a tbss for a few years but I bought that for the wife so I can't count that lol.
Anyhow, I just picked up a 2006 gto m6 that has an lq4 in it with stock 823 heads and a btr stage 3 ls3 cam. I have all the supporting exhaust mods and intake system but am still running a stock tb and ls3 intake manifold.
I realize this setup would be great for boost or even nitrous however I'd like to keep the car N/a. On my current setup tuned I am pUtting down 380rwhp and 347 ft lbs on a land and sea dyno.
I'd love to improve these numbers as well as how the car feels. Currently if feels like the car doesn't start pulling until 4500rpms. It almost feels like boost lag lol.
So what's my best strategy here besides going stroker? Should I have my 823's ported and milled? Go with a bigger cam? And Or should I go to 243's that are milled and ported as well as a fast 102 setup? The 243's wouldn't cost me anything besides having them worked on as I already have a set laying around. Thanks for the advice on this.
Justin
Anyhow, I just picked up a 2006 gto m6 that has an lq4 in it with stock 823 heads and a btr stage 3 ls3 cam. I have all the supporting exhaust mods and intake system but am still running a stock tb and ls3 intake manifold.
I realize this setup would be great for boost or even nitrous however I'd like to keep the car N/a. On my current setup tuned I am pUtting down 380rwhp and 347 ft lbs on a land and sea dyno.
I'd love to improve these numbers as well as how the car feels. Currently if feels like the car doesn't start pulling until 4500rpms. It almost feels like boost lag lol.
So what's my best strategy here besides going stroker? Should I have my 823's ported and milled? Go with a bigger cam? And Or should I go to 243's that are milled and ported as well as a fast 102 setup? The 243's wouldn't cost me anything besides having them worked on as I already have a set laying around. Thanks for the advice on this.
Justin
10-15-2015, 03:26 PM
#2
I definitely believe you could benefit from a bump in compression, and or a swap to a less aggressive camshaft. The issue you are going to run into while trying to gain any notable increase in compression with your combo is piston to valve clearance. Send me a message or give me a call and Ill be happy to help you out.
Thanks
Aaron @ Thompson Motorsports
972-853-2450
Thanks
Aaron @ Thompson Motorsports
972-853-2450
Last edited by thompson; 10-15-2015 at 03:32 PM.
10-15-2015, 05:56 PM
#4
My current daily driver is LS3 powered and come time to mod it will probably get cathedrals even with a 4.02 first gear the lack of lowend is apparent. Still fun but I believe the rectangle ports are a form of torque management so the power train only sees torque at WOT not during normal driving.
10-15-2015, 06:59 PM
#5
My current daily driver is LS3 powered and come time to mod it will probably get cathedrals even with a 4.02 first gear the lack of lowend is apparent. Still fun but I believe the rectangle ports are a form of torque management so the power train only sees torque at WOT not during normal driving.
10-17-2015, 06:58 AM
#7
So what are your guys thoughts on Milling and porting my 823 heads and fly cutting my stock pistons? this should do the job correct? I haven't heard of too many guys trying this with rectangular port heads, so I am a little leary. Id hate to sacrifice flow by going back to a cathedral head
Last edited by Justin93; 10-17-2015 at 07:11 AM.
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10-17-2015, 08:57 AM
#9
So what are your guys thoughts on Milling and porting my 823 heads and fly cutting my stock pistons? this should do the job correct? I haven't heard of too many guys trying this with rectangular port heads, so I am a little leary. Id hate to sacrifice flow by going back to a cathedral head
I think more compression and a properly chosen camshaft will reward you nicely.
10-17-2015, 09:46 AM
#10
Milling and flycutting would definitly be worthwile. Getting the compression up will be a plus. You can certainly have the heads ported, but if I were on a budget, I wouldn't. The big square port heads will deliver all you need as they are. I think more compression and a properly chosen camshaft will reward you nicely.
10-17-2015, 04:16 PM
#13
TECH Veteran
I'm running the same exact cam!! I love it!! It makes way more power than yours do which gave me scratching my head 
10-17-2015, 05:37 PM
#16
TECH Veteran
Kooks headers and true duals.
pushed 460 plus at the rear tire. 6 speed car with 10 bolt.
Also running a nick Williams 92mm throttle body.
42 lb injectors
821 cylinder heads
Dynojet##
10-18-2015, 06:43 AM
#17
Yea see my car is stock bore with stock lq4 dished Pistons. I have an lq9 with flat tops in my garage from when I replaced the motor in my friends escalade, only prob is it had 3 spun bearings and a cam bearing failure. I may just do a cheapo rebuild on that block and put some after market Pistons in it with valve reliefs. All that extra compression should do the job. Then I'll sell this lq4 to recoup some money.
