After seeing this post: https://honda-tech.com/forums/showpo...postcount=1453
I wanted to know how much power people made using a stock GSR intake manifold in a all motor set-up. post dyno graphs and set ups if anyone else have done this before or is currently running this set up. kampai

 

Interesting graph. In my 1.8ltr GSR with ITR pistons my tuner maxed out the stock GSR manifold at about 175-180whp, this was also on a dyno jet. We couldn't get any more power, adjusted timing, fuel changes, cam gear adjustments.
Those numbers even for a 2.0ltr seem a bit generous. It would be nice if they showed the SAE numbers.

 

what other mods did you have or was it stock cams also? the IAB controls the secondaries correct? what rpm does the IAB open up the butterflies?

 

I am running ITR cams now.
I have an Hondata S300 in a P72, I can adjust and the IAB controls with that.
I want to say when I had my ITR cams in with the GSR manifold we had the IAB at 5000 or so. Can't remember right now. Maybe my notes at home have it.

Found some other notes.
GSR manifold with GSR Cams 171/130.
port and polished GSR manifold with ITR Cams 182/134.

 

With SAE correction, the #'s for the referenced dyno graph was 218hp, 152tq. IAB activation ended up @ 5000 w/ vtec @ 5600.
Yes I would agree at the unusual output. I was very suprised. I think it was a combo of degreeing the cams, and luck. The goal for this build is to get close to 240whp. I used the gsr mani on purpose, as I think it is underrated. I have not found a dyno sheet yet, that has the same smooth low cam torque delivery.

Dave

 

i been waiting for you to post on this thread. im glad you used the stock GSR IM cuz i too believe its under rated and from your dyno graph it shows people what its capable of (for all motor). what engine management are you using? Hondata? is your car daily driven?

 

My GSR manifold is currently undergoing a second round of modifications to get it to out flow a Skunk2 Pro and Px on the top end and still keep the low end power.

I have a few concerns about that power level on a stock manifold.
The shop doing my work has a stock untouched GSR manifold and it flowed 220cfm. I find it very hard to believe that you hit 218 on a bone stock manifold. Good that we have SAE numbers now.
Secondly the GSR manifold has a tiny plenum, nowhere enough to supply a 2.0ltr in the top end without the power curve falling off like a ton of bricks.
Last not sure how you got the peak power at that high of rpm, the short runners are too long and way too much surface area.

 

the huge cams unloading the manifold can have something to do with it, altough the numbers seem high to me to. ported GSR can do some serious damage tough

 

Flow #'s and concerns aside, it recorded the same tq curve run after run on a Dynojet 248. I have used this local dyno on approx 20 different setups, NA and turbo/supercharged. The power recorded always seemed to be normal dynojet numbers. The proof of course will be in the trap speeds. The TQ is dropping on the top end. 7500-8500 dumps 10lb-ft.
The car has been a daily since tuning was completed. I used a stock ECU edited w/ CROME.

Dave

 

This is quite interesting. I would of never thought anyone would use that intake manifold on a set up like that. Amazing numbers though, props and respect man.

That's what I was thinking. I want to try this on my 2.0L GSR when I get it tuned.

 

Found some of my notes.
VTEC 4800 IAB 6100. The manifold has been PnP'd as well as my head.
With a DC Sports 4-1 Header 182whp, with a SMSP header I made 185whp. (We thought it was the header holding me back not the manifold)

 

yea i think you may have gotten your wording mixed up on the last sentance because that doesnt make sense. 2nd where is your peak tq at when you dynoed your set-up?

 

What was confusing? The short runners are used for top end power, right. In the GSR manifold they are a bit long for good top end power, and thus have a lot of surface area. That increase in surface area slows down the air, making less power.
When I measured the short runners in the GSR manifold and compared them to my Px, they where longer than the Px. Not good for top end power.
With my Port'd and Polish'd GSR manifold HP peaked at 7700rpm and torque was at 5600rpm.

 

You mentioned mfactory gearing in your build list. Can you elaborate? All gears, just the final, which ones?

This torque curve isn't as strong as yours but still pretty flat.

 

Ooooo sorry about that. Completely misinterpreted that. But i don't believe the surface area actually slowed down the air speed.

 

Mfactory 1st,3rd,4th, B16/R 2nd, OE 4.4 final.
Dyno was done in 4th gear, 1.296.

Uncorrected is still valid. On that day, at that time, it recorded 228hp.

Dave

 

you have any videos of your car in action leed?

 

I have dyno vid, and some pretty crappy night time in-car ripper vid.
Nothing on youtube yet.

 

It's valid on that day but it cannot be compared to any other day or to any other changes you make unless you use a correction factor such as STD or SAE.

 

That is correct.

 

yo Leed, what's your AFR @ WOT? Also, whats your gas mileage since you daily the car?

 

Ever heard of Erik's Racing??

 

they provided a ported gsr mani ... i dont know how it matched up to these guys tho ... they where befor my car time i ddint get my gsr till 3 years ago

 

Around town driving has seen a best of 28mpg. Long freeway trip of 240m saw a two way average of 36mpg. Worst tank by far was @ 22mpg.

I was a little surprised that even w/ the large low-speed lobes, it achieved 36mpg under steady state cruise. Cruising A/F's were mid-low 15's.

 

care to post it?