Throttle Response (I need some)
Thread Starter
Teching In
Joined: Jul 2012
Posts: 13
Likes: 0
From: Des Moines, IA
Throttle Response (I need some) Throttle response
I am looking to get the most throttle response out of my new motor as possible. My motor is going into a new rock crawler buggy and the more “snappy” the motor is the better. Here are specs on motor
LQ4 with complete rebuild
stock pistons
317 heads milled .35 w/ valve job
Heads ported and polished, they now flow 290 CFM
Texas speed 224 224 112 cam
Ceramic coated block hugging headers
Stock truck intake
Holley EFI HP system
What do I need to do to get the most Throttle response out of this motor? Port intake, underdrive pulleys,…
I am looking to get the most throttle response out of my new motor as possible. My motor is going into a new rock crawler buggy and the more “snappy” the motor is the better. Here are specs on motor
LQ4 with complete rebuild
stock pistons
317 heads milled .35 w/ valve job
Heads ported and polished, they now flow 290 CFM
Texas speed 224 224 112 cam
Ceramic coated block hugging headers
Stock truck intake
Holley EFI HP system
What do I need to do to get the most Throttle response out of this motor? Port intake, underdrive pulleys,…
Launching!
Joined: Jun 2011
Posts: 245
Likes: 0
From: Honolulu, Hawaii
Fast 102mm intake and nick Williams 92mm throttle body. A fast 92mm intake mani would be good too, but I would go with the 102 since your running the 6liter. Defiantly the nick William THrottle body ftw. I hate some awesome hp/tq gains on my ls1 and huge difference in throttle response.
high compression (high DCR is more important - mostly dictated by cam selection and phasing), tight quench, heads ported to maintain high mid-lift velocities - not just peak flow numbers, no intake restrictions (bbtb's, maf's, etc.)
TECH Resident
Joined: Sep 2009
Posts: 859
Likes: 2
From: Frozen Tundra, WI
x3 for maximize your compression...with the fuel you are going to be using. Get a custom cam if needed, for the best valve events. You won't regret it for an extra $25 or so.
Last edited by Paul57; May 11, 2013 at 03:25 AM.
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TECH Resident
Joined: Sep 2009
Posts: 859
Likes: 2
From: Frozen Tundra, WI
Here are a couple of good articles...
http://www.chevyhiperformance.com/te...e_compression/
http://www.popularhotrodding.com/eng...ression_ratio/
Calculators - I believe cranking pressure is better "real world" information...
http://www.csgnetwork.com/compcalc.html
http://www.wallaceracing.com/dynamic-cr.php
http://www.chevyhiperformance.com/te...e_compression/
http://www.popularhotrodding.com/eng...ression_ratio/
Calculators - I believe cranking pressure is better "real world" information...
http://www.csgnetwork.com/compcalc.html
http://www.wallaceracing.com/dynamic-cr.php
Last edited by Paul57; May 11, 2013 at 05:33 AM.
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A 102TB is not the only piece to the puzzle. (ignoring the obvious engine internal stuff). As a note on a non stroked or bigger cube motor. The 102mm TB cause a BIG loss in resolution to throttle input. By 60% throttle I get 90kPa all the way to redline. At about 65% I get 99-101kPa to redline. That tells me that my TB is about 30% too big. I'd go with a 90-92mm in hindsight if I were to do it again. The 6.0L with a smaller cam isn't going to be all that different from my 5.7 on flow. I suggest a 92mm.
I added a 102 tb among other things and it would bog and be slow to rise in RPM. Timing is the key here. I added timing to the idle and main spark tables in the 1200-2000 rpm areas. The motor REALLY woke up. If you can take a little bucking at light throttle you can go pretty far with the timing. IE mid 20's and it will feel very "snappy".
What are the chamber cc with a .035 mill? Ideally you'd want around a 8.5 DCR and 11.5 SCR which is fine on pump gas with the proper cam and quench.
I added a 102 tb among other things and it would bog and be slow to rise in RPM. Timing is the key here. I added timing to the idle and main spark tables in the 1200-2000 rpm areas. The motor REALLY woke up. If you can take a little bucking at light throttle you can go pretty far with the timing. IE mid 20's and it will feel very "snappy".
What are the chamber cc with a .035 mill? Ideally you'd want around a 8.5 DCR and 11.5 SCR which is fine on pump gas with the proper cam and quench.
Last edited by Exidous; May 11, 2013 at 06:55 PM.
Launching!
Joined: Jun 2011
Posts: 245
Likes: 0
From: Honolulu, Hawaii
Yeah wouldn't go with 102 TB unless your running boost. I would go with a 92mm TB. But you will be fine with the fast 102 intake manifold, I'm running a fast 102 intake on my ls1 with a fast 92mm TB with impressive gains.
