Went to the Dyno (MD dynometer) last wens night to baseline my car and fine tune before we tested the ExtrudeHoned ITR intake manifold. On my ITR swapping out the Stock ITR throttlebody for a Bored out 64mm throttle body netted no increase in horsepower.

The next morning I swapped intake manifolds, removed my stock ITR and replaced it with the ExtrudeHoned ITR intake Manifold. Again very little change. There was a .8 increase in whp up top The only real noticable part was that the horsepower did not peak and drop off like it had before, it peaked and held the line until the test ended. (peaked at 8200 rpm it was flat until 8500 rpm) On the trace data from the A/f chart the vehicle did lean out slightly, both indications that it was flowing better up top.

In conclusion: on a stock or slightly modded ITR (185whp MD dyno) the throttle body and intake manifold are not limiting factors on horsepower.

I am sure with a set of cams,compression.......The Extrudehoned intake manifold would make more power up top than the stock ITR above 8500 RPM. We will be testing it again in a month or so on a 220+ whp 2.0 n/a motor. I'll post when when I have the results.

I did not have the Dyno charts with me at home, but they are not even worth looking at.

Mattj


[Modified by Dropspeed, 10:02 PM 12/16/2002]

 

Good honest review Can't wait to hear the results from future tests.

 

Dropspeed,
Did you notice a nice flat torque curve? From my experience the hp on a stock motor did not increase but the torque and midrange are nice and fat.
Nice Review
EVIL

 

The torque and hp curve did not change, here is what my dyno chart look like form before.

https://honda-tech.com/zerothread?id=317285

After caculating the duty cylce for my stock injectors I have since added a FPR and bumped the fuel pressure up 3 psi as well as tuning with a VAFC.

Mattj

 

but u would see better throttle response...which can't be represented on the dyno plots..

 

[QUOTE]but u would see better throttle response...which can't be represented on the dyno plots..[/QUOTE


What is better throttle response? compared to what? Does it help acceleration or do anything if the car is floored 1st-4th gear (dragrace)? Can a lightened flywheel and crank pulley have the same effect on throttle response?

I'm not picking on you.........but you brought it up so I want to see some legitimate answers from people.

Mattj

 

this review should be required reading for beginners...

the problem with Extrudehone is that it does not cut asymmetric shapes. The material is removed symmetrically or evenly. In cases where you want a taper, it's not the ideal route. It's advantages has always been that it gets at hard to reach areas that need cleaning up. Some casting flaws in a head or IM should not be ground smooth...they actually help in maintaining good mixture quality.

IM plenum volume, runner diameter & length, and runner taper has always been the key factors to determing where your peak torque occurs and the width-location of your powerband...ram tuning...The ITR IM is a high rpm powerband oriented IM from the get go. Strategic areas need to be removed not all areas...

TB size is dictated by IM plenum volume.

big plenum...small TB (eg. Chris Rado's 800+whp Kinsler IM and use of a stock 62mm TB)

small plenum...big TB

there is the law of diminishing returns for TB's...losing flow speed to trade off against getting more flow volume will hurt your acceleration...so getting a Infiniti Q45 TB is not the answer to your acceleration needs....

 

Thanks for taking the time to post your results, as I've seen in the past this has been a question asked before. for you.

 

It's good to know what really won't affect your power, and not to bother messing with it (barring that the next test will have significant results).

 

Well after reading this post I must draw my own conclusion. IMHO, I dont think the money spent to Extrudehone my Skunk 2 ITR manifold would be worth it for the few HP gain above 8500 RPM.... I think I can spend that money elsewhere for power....

Dropspeed, thanks for the review though, keep us posted when you use that manifold on a 2.0L engine


[Modified by TODA-POWERED 95 GSR, 10:02 AM 12/18/2002]

 

no-hype reviews. Thanks for posting that!

 

i'm talking about better throttle response compared to your stock setup..i'm not talking about how it will affect acceleration, but how quickly the car will react to user inputs.... it's more of a 'feel' from the user and not really 'measurable'.. i noticed that when i installed my bored out TB, the throttle response was quicker and I thought i was getting more HP.. but my *** dyno is not as well calibrated as a real dyno, so i could been wrong..

 

 

Great review!

Thank you for spending a small fortune with extrude hone, so the rest of us don't have to.

- here's one on me.

 

That was a great review. Thanks

 

nice test and review

I hope to be able to test and compare my JG IM against my stock manifold when my car is complete. The motor has been opened up a bit with pistons, JUN3s and 70mm TB, and a mild porting job on both intake and exhaust sides. This should be a nice indication of whether the stock manifold is restrictive and/or if the JG flows better.

nice post

 

yeah Matt- so when is that 2.0L supposed to be done and on the dyno...?

 

hci magazine extrude honed a b 16a manifold and found that it made more overall power than the r manifold( stock). their conclusion was that without a huge cam and bigger motor that the b16 manifold was the better unit. they also had gains against the stock baseline vs the extrude manifold.

 

To sil, I actually dont think that you would get a better throttle response. I too have a larger throttle body and infact found that the response was slower than stock!!!

As a result we increased exhaust size to 2.5 to compensate and I am still feeling a slower trhrottle respose. Although, top end is not bad!!!!!

 

yeah , nothing but technical info in that trash rag....