my previous thread on my car: https://honda-tech.com/forums/all-motor-naturally-aspirated-44/update-my-91-crx-hf-1-8-stock-bottom-93-octane-pumpgas-2696037/


So I bought a RMF narrow replica to make some more power, and it actually made a few HP less. Now sure, maybe we could sit around on the dyno all day and tweak and tune the living crap out of the car to make 1 or 2 more WHP, but it will surely not gain 10-15WHP as others indicate. None of the other dyno comparison graphs show the A/F ratios at all when they show the gains of the fake RMF header.

anyways, here are my dyno graphs. If you want to see them on the same pic overlaid on one another, maybe Huy can save another screen shot and post it.

here are the dyno plots. keep in mind that the original tune was done in december. the other three plots are done on the same dyno session.
fake rmf open header

fake rmf with full exhaust

original type r tune

stock type r retune


btw the car run a few runs 12.5@106 with a 1.8 60's at IFO Houston this past weekend on the ITR header. I felt robbed, not getting to use my new slicks at all due to wheel fitment issues, so I will get back to the track next chance I get with the new slicks to see how I do.


edited to rehost pics. hi-upload apparently went down and lost all the pics.

 

kinda thought those headers looked weird. hahah Thanks for the info!

 

This is the first time i seen results like this going from itr 4-2-1 to the rmf replica.

 

you actually lost hp throughout the WHOLE graph going from the stock cast manifold to the RMF replica. I would be totally depressed .

 

LOL well you know....I was curious to see how this header really performed, being that nobody would post comparison dyno graphs with same-day tuning results showing the A/F ratios. Sorry I couldn't compare it to a badass header like a Hytech or something, but I guess the ITR will do for now. If someone wants to send me a Hytech replica (or even a real Hytech LOL) I will do another comparison with my car on the dyno.

 

^^^ That would be BA

 

What does your high cam timing table look like for both?

I only ask because the RMF Replica dyno graph looks to be wanting more ignition advance. Good indicator is the 'choppyness' of the curve.

Thank you for sharing.

 

useful info.

 

the original type r tune and the fake rmf open header/full exhaust shared the same high cam timing table, the retune type R graph has 2 more deg up top, although I did try to add some timing to the rmf tune but see no increase in power so I left it alone. I'd like to post the screen shot of the ign table but don't know how. Regardless of whatever it is, this header does not make what it advertised to be even if I spend a whole day tuning it out. Not 13-15whp like it was advertised. I'd be impress to see more than 2-3whp over the stock ITR. I've seen the old JG-edelbrock with the modified collector made 6-7whp over the stock ITR piece and though that was impressive

 

Interesting information, I was about to sell my fujibitsu for this. I might wait till I order the RMF and do a back to back and see.

 

damn i just put my kiddracing header on my car in place of a greddy 4-2-1 hope it wasnt a waste of money havent drove it yet...

 

^^^^ test it back to back and let us know.

 

word, change the header out on the dyno and then retune. And be sure to post the A/F ratio in the dyno graph like I did.

 

on a side note, the car is faster than ever, Huy. I can't wait to bring it to the track again with the new slicks and the CEL issue fixed so I can run back to back without problems and with traction.

 

what type of gearbox and what size slicks will you be using?

 

Is there any way you could be SAE numbers posted? You mentioned that one of the tunes was done in December and the others where at a different time. The SAE numbers will take out the weather variations.

Other than that very good and helpful information.

 

I'm running on stock B16 gears (except I threw in an LS 5th gear for highway driving that doesn't rattle my brain as much)

my slicks are 22x9 on my 13x10 weld magnums. I couldn't run them at IFO due to weheel fitment issues. I'm going to grind down something on the calipers so I have no rubbing. I'm also going to run on my M&H DOT street tires to see how well I do on street tires. Here are a couple pics I took (as I was snapping pics of the firetrucks next door I decided to take a couple of my dirty car)

 

don't STD numbers also correct due to weather variations, just to a different set of conditions? I know the uncorrected WHP from December is 209 (as you see in the graph) and the uncorrected from my newest tune on the ITR header is 205.0, but I didn't post it.

 

the fake rmf open header/full exhaust/retune type R tests are on the same day within 15 mins intervals in between of switching headers and drop the exhaust so there's no weather variations here. And again regardless of whatever it is the differences is very very small. The point is that the rmf replica did not deliver as it was advertised something like 13-15whp as others have tested. We're independent shop, we're not here trying to sell or promote our products, just trying to help out fellow honda-tech on smart purchases

 

I read over the testing again after my morning RedBull. Your right the oldest tune has no bearing on this test.
YES STD numbers also correct due to weather variations, ~2.6% higher that SAE numbers.
I was always a bit suspect of the advertised results as well for these headers.
Good testing and good information

 

yeah, it seems like they could use some stepped primaries and a real collector, then it would make more than the ITR header.

 

maybe Vteckidd can chime in to give advice on what his header likes and dislikes.

 

Ran the ITR cast header for years on my car and then my buddies eg hatch loved it until Hytech came into our lives thanks to Huy!

 

is this the same header I am using now? maybe it has special powers due to all the heart put into it over the years. PeeWee was using it before me, that's got to be good for at least an extra 4-5 WHP right there LOL.

 

Not sure it might be?....I sold it to a friend years and years ago and he was an inline customer. You never know. I loved that thing