PhD's post about the BS that sales people try to heap on so right on the target that I had to check to make sure it was his avatar on the left not mine. (maybe it's the PhD part?). I can't believe the absolute horsheshit that salespeople spew sometimes.

His post also brings a question that's been asked here many times and I've never seen a good answer: Who in the Bay area knows wtf they're doing around the S2000? Yeah, people have dropped the name of this or that shop, but really, who's installed 10 SC's and dyno tuned them around here? When I walked into Comptech's shop and saw a spare S2000 they use to test fit stuff just rotting out in their parking lot plus one stripped to the chassis (not to mention all the other Hondas) I though they should open a satellite garage out here

Anyway, there is no doubt in my mind that by adding more air to an already high compression ratio system increases the risks for failure of ANY internal combustion engine (clogged injector, using too low octane fuel, not enough or wrong motor oil and the list goes on).

That said, I looked long and hard at what data I could get on the Comptech unit before taking the plunge. Basically, below about 5,000 rpm all this system does is add about 30 lb of dead weight hanging off the VTEC solenoid mounting point and some additional drag on the crankshaft. IOW, you are running at barely above atmospheric pressure. Above 5,000 you begin to build boost to what seems like a very low 5-6psi. (Low by the standards of low compression turbocharged cars on the market... not low for our F20c). To me, this means that I can drive with relative peace of mind below VTEC without the engine seeing more air and use the blower when I want a little extra kick (a few seconds here and there). I also waited until it was out of warranty since it was going to be voided by the SC . Lastly, I don't use it as my daily driver so if it does "blow" it might sit in the garage for a while until I get around to having it fixed.

 

[QUOTE=Halo,Apr 19 2005, 08:34 PM] ...
Basically, below about 5,000 rpm all this system does is add about 30 lb of dead weight hanging off the VTEC solenoid mounting point and some additional drag on the crankshaft.

 

In general taking a NA engine and adding boost without internal changes will descease life. The other car has not experienced any problems in the 100K abusive miles she has seen. It sees 20PSI all the time and has no problems..... little engineering goes a long ways.

 

 

 

20psi? wow.

I was thinking of going F/I after I get some funds, and I don't think your shop's opinions are going to change my mind.

 

I'm not sure how this statement changes my conclusions. If you're implying that a partially opened throttle plate will decrease the boost seen at the intake manifold then it just further supports my argument that below about 5,000 rpm, the car is effectively running on atmospheric pressure. My dyno plot with A/F and intake manifold pressure showed this to be true.

 

Huh?

 

[QUOTE=m@dm@n,Apr 20 2005, 07:24 AM]In general taking a NA engine and adding boost without internal changes will descease life.