My wife has a 97' Type-R and I was wondering since we have an extra IM sitting around that is ported would it be better than the stock manifold?

Does anyone have any dyno graph's of this comparison or has anyone tried it and know the difference in performance.

Just let me know if you have any info or links...

Thanks

 

It would primarily depend upon how well the manifold is ported. It's possible that it will improve performance, but it's also possible that it will hurt it. The only way to really be sure is to put it on a dyno.

 

Endyn did a lot of work on a Skunk2 IM a while ago and got equal flow characteristics of 50mm TODA ITB's at .500" lift.

FYI Skunk2 IM = ITR IM...almost.

 

I guess I should re-word this. I was wondering if a mildly ported ITR IM has much gain over a completely stock ITR IM on an ITR?

I don't want an aftermarket IM for this car I just want to know if what I have works better or if it isn't even worth the effort....

thanks though

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by #26Type-R &raquo;</TD></TR><TR><TD CLASS="quote">I guess I should re-word this. I was wondering if a mildly ported ITR IM has much gain over a completely stock ITR IM on an ITR?

I don't want an aftermarket IM for this car I just want to know if what I have works better or if it isn't even worth the effort....

thanks though</TD></TR></TABLE>

I would not bother.

 

as already stated, it could help some, but it could also hurt some. the IM is not really much of a "bottleneck" in the system so you probably wont see much difference, good or bad.

I dont know how much truth there is to this theory, but I heard that speeding up airflow into the head is what helps increase pressure and make more power, hense boosted cars make a lot more power than NA cars. And if you were to port the IM, you are making the airway larger, which is going to slow the airflow down, hense making less power. Obviously there are many differing opinions on this, and lots of other factors affect this as well, so its hard to say if it helps or not. Only way to know is do it, and get on a dyno.

 

Yeah, I have been trying to tell my wife this, but she needed this info to let her know that this mod. wouldn't really help. I was telling her to Hondata the Type-R. I just haven't done any research on this set-up yet.

I appreciate the info though

 

Air velocity helps on N/A cars more in the low-end and midrange.

Once an engine reaches its peak volumetric efficiency, which many agree is where peak torque occurs, is the point at which the air intake system becomes a "bottleneck" (for the lack of a better word). At that point, lets just say 7000 rpms for this purpose, the stock setup is not holding you back. A larger plenum with larger and shorter runners can help the engine breathe better after the peak VE, but sometimes running TOO large of a plenum/porting can cause the air to slow down, which is where RTW Ryan is correct, there are many examples of too much airflow causing a loss of power, especially in our 'peaky' engines.

Good engine builders can work around this, by adding material and taking away material to change the angle of the ports/runners to allow better air delivery, thus increasing power throughout the entire RPM range. If she is interested in this, I would recommend contacting either Endyn, Portflow or Alaniz, all are very competent Honda builders with many success stories.

However, at this point Hondata would be a much better investment

 

Cool, I hope she will agree to Hondata cause I want to get this R on the dyno.....

Thanks guys