Whats going on gents. I just helped a friend out and bought a 00 gsr with a freshly rebuilt gsr. I was going to DD it, but I'm waiting to finish my track car, and I have a full other BMC turbo kit. So here's the question, usdm gsr, pr3 pistons, Then a garret 60-1 on just a couple pounds, I'm sure Ill hear its all in the tune. I've been around cars long enough to know that, Just curious about your experience, tuning or owing something of this nature. Just a highER compression bseries vtec on boost. I read some things after searching, again just want to hear from other peoples first hand, not what you hear or think. Thanks.

 

You're probably not going to like this.. But, because of this over 11.0:1 compression on a stock piston utilizing too large of a turbo outside of its range, you're not going to get many "experiences" from people like that.

There are plenty of higher compression people over 11.0:1 that are boosting, but they are 1) using a MUCH smaller turbo within its efficiency range (And they knew that when they decided to go this high of a compression) and 2) they didn't use an OEM piston at the same time (again, because they knew that when they put it together from the beginning, and didn't just "throw it" together.

So, perhaps people who did it the same way you did will chime in, but the probability is rather low. Good luck.

 

Dont get me wrong, I have been doing this a while and completely agree, just curious to see if I was to put a kit on it, on lets say 7 lbs type deal, that it would be ok. I may just sell the gsr, and put a stock b20 turbo in it. Or just leave it alone and drive it, Decisions. ****. lol

 

This is one of those "I'm-gonna-just-see-how-well-this-works" type of scenarios. Screw the experiences of others... BE the experience. You've been around the block with this stuff. Just do it, tune, it and express your experience.

 

Here is a old thread on my high compression turbo setup. Take what you will from it. My car ran like a raped ape. I was on E85 though, pump gas won't be as forgiving.



https://honda-tech.com/forums/forced-induction-16/e85-stock-block-ctr-pistons-boost-dyno-graph-3018979/

 

Well, there you go.. Experience in action !

 

I have done it.

b18a block
pr3 pistons
shot peened rods
arp rod bolts
cometic gasket
arp head studs


gt3076r
ramhorn
44mm gate

all else was stock other than the fuel pump.


Saw awesome power while it ran. About 3 weeks, then I collapsed a skirt, and cracked a ring land(on different pistons). My machinist said that the pistons saw some serious heat too. He was surprised it was still running when I pulled it. Really the only difference it made with the tore up pistons, was about 20whp less, and it sounded like my p2w clearance was way out. LOTS OF CLACKING.

 

The thing is those pistons are fairly "lighweight" cast pistons. Pistons designed for NA use have thinner domes vs FI pistons, whether cast or forged. Muckman had the same issue with his high conpression forged pistons. They were thinner than FI pistons and had much thinner piston pins as well, which he ended up bending all 4 of them.

And Honda made them even lighter than other oem pistons for incresed engine response, not to handle high cylinder pressures, so using an oem cast piston is a crap shoot at "low" compression, with the pr3 pistons I'll almost guarantee it's a timebomb

 

My boy had a ls vtec w b16 piston n 60-1 was pushing 7 psi made 288 hp I dnt remember tq this was at least 5 yrs ago,,,,,. He had it over a year. N sold the car running. Daily driven. Not exact same setup but similar.

 

What head? B16 heads yield a slightly lower compression ratio than gsr heads due to combustion chamber volume.

 

Gsr head n yup i no.