RockCrawler95

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,…

redtan

iTrader: (5)

If you're not going to change out any of the engine components, then the only two things that will really help that is porting and polishing the thorttle body and a good tune.

JakeFusion

iTrader: (7)

Compression. A lot of compression makes the engine snappy. So does a lightweight clutch assembly.

therabidweasel

iTrader: (5)

102mm TB

/thread.

D14HUGGER.ORANGE

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.

ckpitt55

iTrader: (4)

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.)

Paul57

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.

Paul57

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

Exidous

iTrader: (11)

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.

D14HUGGER.ORANGE

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.