Raised Compression 7.3

Jacob 76 · Sep 11, 2015

I'm in the planning stages of building an engine for our desert truck. I'm only looking to make around 450-500 hp but it needs to be almost instant and be able to live at that for extended periods of time. I've already got the cooling system and oil cooling system figured out and now I'm just looking for opinions on making this thing as snappy as possible. I'd like some opinions on cams and what you guys think about raising the compression to increase throttle response? I know raised compression engines like to throw rods so I planned on running carillos. This is the plan so far...

-Modified Irate t4 kit
-small bb Garrett or precision and gate around it
-carillo rods with custom Pistons
-Hypermax hi rev kit
-smith bros pushrods
-cam, open to opinions
-live tuned DP
-full force 160/100s possibly bigger but I want to stick with a single
-t500 hpop

The rest of the drivetrain is already figured out I just need some help with this. Mostly I'm looking for opinions on cams, injector size, and the raised compression idea. I just want this thing to act more like a gasser when it comes to throttle response.

WILD_PHIL · Sep 11, 2015

Subscribed because I love the desert trucks. Lol Good luck with the build.

E99 F350/zf6/guages/arp/comp/stellite/ billet wheel/ bellowed... Need more fuel and more air.

Magnum PD · Sep 11, 2015

I would run a tighter turbine housing on whatever turbo you choose to keep turbo boost up. 238/100's may be a better injector.

Jacob 76 · Sep 11, 2015

I think you're right about the 238s. The 160s that are in there made 444/7xx on a race tune. I'd rather not max out everything to get the power, I'd rather keep it pretty conservative.

Jacob 76 · Sep 11, 2015

Also, I just read you sig. I'm guessing you did your build all at once and never isolated the cam, but how do you like your DI cam?

Magnum PD · Sep 11, 2015

To judge from a stock cam to the DI cam side by side, I can't tell you. David Lott should be able to tell you.

On the turbine housing, the tighter the housing, the quicker the response. Just have a good wastegate. Too much back pressure can harm the turbo. Make sure you get a good air filter. Sand and turbos don't mix very well.

Jacob 76 · Sep 11, 2015

Yeah I was thinking something like a 63/68 and gate around it. Probably get a tune specifically for keeping it floored and limit rpm to low 3s to try and keep heat down.

Groomzybanshee · Sep 11, 2015

4094r and some 238s/250s.

Jacob 76 · Sep 11, 2015

We run mostly all Garretts in our race setups but even with the superior quality of the BB Garrett stuff I don't see how an 83mm turbine, even in a tight housing would spool as fast as a 68mm turbine in a .9AR housing. Then looking past the turbine side the comp wheel is vastly heavier. Depending on which GTX you're referring to its anywhere from a 65-68mm inducer and 94mm exducer on the comp wheel. Quite a bit larger than the Borg 63mm inducer 87mm exducer comp wheel. And in my dealings with Garrett they strongly suggested not running anything smaller than a 42 frame in a diesel application. I've seen people run 37 frames but have no personal experience with them.