Stock LS, Greddy 18G 249.2whp/246.5wtq

TheGuardian · Post by **TheGuardian** » Thu Aug 27, 2009 10:20 am

Stock LS with 120,000 miles on the clock Greddy 18G w/ Greddy exhuast manifold MAC boost controller set @13psi 3\" custom downpipe 3\" Thermal R&D Exhaust RC 550cc injectors Walbro 255 Greddy Intercooler and piping Turbo XS RFL Bov Tuned by Matt Shue in Richmond VA With a goal of 250whp I'm very happy with the results. 249.2whp/246.5wtq

On the dyno

sgtmillhouse648 · Post by **sgtmillhouse648** » Thu Aug 27, 2009 2:36 pm

Very sharp! Are you still utilizing the GReddy elbow or did you step up to something less restrictive?

TheGuardian · Post by **TheGuardian** » Thu Aug 27, 2009 8:59 pm

sgtmillhouse648 wrote:Very sharp! Are you still utilizing the GReddy elbow or did you step up to something less restrictive?

Na, I did away with that restrictive piece of junk... I replaced it with a Custom 3" Downpipe, helps her spool earlier thats for sure:

ckretvix · Post by **ckretvix** » Fri Aug 28, 2009 9:55 pm

I made very similar #'s (254/244) with a pretty much identical setup at 11 psi. Put a cutout or open dp and you will see 10-15 more whp.

Post by **Bugermass** » Sat Aug 29, 2009 12:54 am

Thats good power for a greddy kit.. The most I've ever gotten out of the greddy kit on a LS was about 275@ 18 PSI.. Didn't really wanna push my luck much more than that cause I could tell from the fueling that the backpressure was already getting pretty high on the top end.. I'll post that map if you want to compare..

ckretvix · Post by **ckretvix** » Sat Aug 29, 2009 1:44 am

Id like to see it =).

TheGuardian · Post by **TheGuardian** » Sat Aug 29, 2009 2:07 am

^Same I've been told the 18G is limited to about 300hp, 18psi is up there, I can't imagine this turbo is very efficient in that range.

Post by **Bugermass** » Sat Aug 29, 2009 3:00 am

I'll post it tommorrow when I have my laptop up.. Its in the car right now, to lazy to go get it.

Post by **Bugermass** » Fri Sep 04, 2009 9:32 pm

Heres the map Car ran for a year+ on this map at 18PSI before the owner sold the car.

TheGuardian · Post by **TheGuardian** » Fri Sep 04, 2009 9:59 pm

Only 49% duty cycle on 550ccs...not bad, I would have thought it would be in the 60-70% range but now that I think about it, that sounds about right. Did you have any problems with the 18g's wastegate over 14psi? I've read that you run into boost creep problems with the 18g over 14psi.

Post by **Bugermass** » Fri Sep 04, 2009 11:31 pm

nope didn't have any creep issues. The timing was maxed out for the setup and fueling was in the 11.5s ..

TheGuardian · Post by **TheGuardian** » Sat Sep 05, 2009 12:02 am

Maxed out as in taken to MBT and retarded 2 degrees?

Post by **Gaskleppie** » Sat Sep 05, 2009 3:00 am

Nice sharp calibration for a stock block. It can handle a lot of timing! We dont have LS blocks here in Holland.

Post by **Bugermass** » Sat Sep 05, 2009 8:47 pm

no as in taken to MBT and left there

Almighty-Si · Post by **Almighty-Si** » Tue Sep 08, 2009 7:56 pm

Sweet ! I thought I was the only who messed with the GReddy kit...LoL...that elbow is a piece of crap and the cause of all the problems with that kit. The stock kit on my B16 made 193whp at 7psi and after the ramhorn manifold, downpipe upgrade (2.5 inch off the turbo) on just under 6psi i made 223whp/272whp on 10psi. I just got the motor built and am about to upgrade the downpipe and exhaust to 3 inch and kicking up the boost to 20psi

I think you would benefit greatly porting the head. What are the plans now or you going to leave it the way it is? Oh by any chance do you still have the GReddy elbow laying around?

eCtune

Stock LS, Greddy 18G 249.2whp/246.5wtq

Stock LS, Greddy 18G 249.2whp/246.5wtq

LS Map