Highest Amount of Supercharged Boost on Stock Internals?

[Max Psi GSR]

while everyones getting mis-readings from their upgraded pullies.....

With the base JRSC kit(6psi)my gauge read 6psi. After adding the ENDYN stepper, it saw 10psi, and 11psi when in 4th/5th gear.

The 6psi gave me a dyno of 210.8whp and 153.8wtq. Putting the stepper on i dynoed at 246.6whp, and 188wtq. Most of that torque was around 3000rpms...........right were i liked it [img]wink.gif[/img]

Tony

[217gsr]

I wish I had as much luck as MaxPsiGT! Unfortunately, AFTER I was strapped to the dyno, the shop informed me that their dyno did not read in SAE measurements. In fact, they couldn't even tell me which correction their dyno uses!! All they said to me was the most cars dyno less on their dyno, but higher on SAE corrected dynojets. By the way, NEVER get dynoed at Pan Autosport (Lemon Grove, I believe).

After strapping me on, the guy made 3 half-attempts. He stopped because he said that the A/F monitor that he was using showed that I was too LEAN. I told him that this was not the case, and to go on tuning.

By the end of 3 max hp. runs, I tuned to 198 hp @ 7500 rpm (11.9 a/f) and a max of 148.22 ft-lbs torque @ 6250 rpms (12.6 a/f). This was with 101 octane gas, 16 degrees timing, and 0 degrees on the timing retard. I tuned LESS than I did before. Eventually, I'll retune on a reliable dynojet. [img]frown.gif[/img]

[Holden]

Jim: Yeah. 12psi on the gauge. Here's my "boost" history...

6psi + AEM CAI + RSR 4-2-1 + stock cat + Greddy PE (60mm-70mm) + Valves as adjusted from factory = 8psi on gauge.

6psi + AEM CAI + RSR 4-2-1 + 2.25" straight pipe + Greddy PE (60mm-70mm) + Valves adjusted to stock spec = 7.5psi on gauge.

CRV Pulley (10psi) + 3" short intake + Kami 4-1 (2.5" collector) + 2.25" straight pipe + Greddy PE (60mm-70mm) + no change in valves = 12psi on gauge.

Really cold days send boost up to 12.5psi. Put the stock cat on my 10psi setup and boost hits 13.5psi.

<font color="#a62a2a" size="1">[ November 17, 2002 06:30 PM: Message edited by: Holden ]</font>

[exciv2000]

<BLOCKQUOTE><font size=2 face="Verdana, Helvetica, sans-serif">quote:</font><table border="0" width="90%" bgcolor="#333333" cellspacing="1" cellpadding="0"><tr><td width="100%"><table border="0" width="100%" cellspacing="0" cellpadding="2" bgcolor="#FF9900"><tr><td width="100%" bgcolor=""><font size=2 face="Verdana, Helvetica, sans-serif">Originally posted by JRCivic:
Can I still come out and ski with you ???

</font></td></tr></table></td></tr></table></BLOCKQUOTE>

Eh, sure! But if you can make an alternator pulley (I assume you have a machine shop that makes them out of blanks of some sort) then you should also make smaller blower pulleys. Anything is cheaper than JR!

[hypa]

Holden, I noticed you mentioned your valves in the above post. Have you experimented with different valve adjustments?


vactor, I'll check into my cat asap. It makes sense though, and it's a somewhat cheap fix.
[img]graemlins/beer.gif[/img]

[Holden]

No.

[MartyMarGSR]

hey Jim, since I'm still running a stock exhaust, do u think upping the boost to 9psi with either a stepper or crv pulley will be too much boost for stock exhaust.

I know im robbing myself of power, but I'm still trying to work on a a quiet 2.5" exhaust system (trying to find a JDM type r exhaust to modify since its 2.5").

Would running 9psi with stock header and exhaust cause any detrimental harm to my engine if i had it tuned well using Zip's SMC?

[CROM]

I really dont see why you would bother.

With 9psi you would be losing 15+whp with that stock exhaust. I think the gains would be hardly noticeable and the restrictive exhaust may cause excess heat buildup.

I have a GREDDY SP exhaust. It is quiet. Get a high flow cat instead of a straight pipe, and you will be fine as far as noise goes. The SP seems to be pretty quiet. I put a straight pipe in and my exhaust got 3x louder. Dont get the 5Zigen Muffler(loud rice crap), or any cheap knockoff or domestic muffler like a Flowmaster, Borla, Dynomax. Seems like the Tanabe exhaust are loud too.

<font color="#a62a2a" size="1">[ November 24, 2002 10:24 PM: Message edited by: CROM ]</font>

[reddelsol]

I have a "hybrid" Greddy sp exhaust.

The greddy was pretty quiet except on highway drives it could make an awful drone. Later on, I quieted it down with a another short resonator (it comes with it's own, a bit longer).

Then later I wanted to open it up a bit more. I had the muffler section cut off and replaced with a bigger 2.5inch unversal stainless steel muffler I found at PepBoys. (don't laugh too hard, I like the sound of it better and so do two of my friends, it's richer and deeper). (I kept the greddy piece figuring I could have it welded back on if it turned out to be a bad idea)

Strangely, it's both louder and softer than the greddy. Cruising, it's quieter, but accelerating it's lounder, but not unpleasant.

The muffler guy also modified some of the flange areas of the exhaust around the cat to remove some restrictions.

Screwing around with a "system" can mess with the overall hp, but I'm still glad I did it. I'm assuming I probably picked up some horses, but I don't really know.

[JRCivic]

Any type of exhaust system... with at least a 60mm internal diameter... should work fine at the boost levels you speak of. Larger is overkill (meaning that 3" is absolutely NOT necessary), but 2.5" would be fine.

Stock does give up a few ponies... but I don't think it is 15. More like half of that.