I know of Sonny who has done this mod.

Putting the Honda K24 Crank Pulley on the RSX to get more boost outa your SC.

Anyone else done this? If so whats the results..

Here are some figures for the CTSC from my blower/pulley calculator. Stock crank is 5.8 inches, K24 crank, according to Sonny, about 6.3 inches:

5.8-inch crank + 3.8-inch blower = 13,000 rpm (observed 4.8psi)
5.8-inch crank + 3.6-inch blower = 13,700 rpm (observed 6.1psi)
5.8-inch crank + 3.3-inch blower = 14,900 rpm (observed 8.5psi)

6.3-inch crank + 3.8-inch blower = 14,100 rpm (est. 6.9psi)
6.3-inch crank + 3.6-inch blower = 14,900 rpm (est. 8.5psi)
6.3-inch crank + 3.3-inch blower = 16,300 rpm (est. 11.1psi)

Now assume that each pound of boost adds between 10 and 12 whp. Also realize that exhaust back pressure and cam angle have an impact on boost, and that the 6.3-inch K24 "overdrive" pulley has to work harder to drive all the other peripherals at higher speed. Taking that into account, you can now do rough estimates on how much power you'll make with each crank/blower pulley combo.

 

Thanks man..R U running the 11PSI on the 470ccs? Im on 440cc on 6PSI and I wanna upgrade to 550 or 650..

 

Any ideas id the ep3 pulley is larger than the k24 pulley? Thosed ep3 losers will trade their parts for anything else honda!

 

Thanks man..R U running the 11PSI on the 470ccs? Im on 440cc on 6PSI and I wanna upgrade to 550 or 650..

No, I am still low boost. Currently I am using 510cc Power Enterprise injectors with 6psi. At 8500 rpm I am at 72% duty cycle.

 

my k24 crank pulley should be coming in tomorrow morning, but i want to get 650cc injectors before it's installed over the 550cc's, they'll be maxed out.

 

my k24 crank pulley should be coming in tomorrow morning, but i want to get 650cc injectors before it's installed over the 550cc's, they'll be maxed out.

awesome whats your setup?

sc pulley size
current injectors.
etc.

 

my k24 crank pulley should be coming in tomorrow morning, but i want to get 650cc injectors before it's installed over the 550cc's, they'll be maxed out.

once you start passing 300WHP, a fuel pump upgrade is typically recommended. I have the walbro intank pump somewhere around my house waiting to be installed (again) once I decide I want to go with 11psi. I think I do, but I can't afford the upgraded MAP required right now.

 

Just ordered my K24 C/P..Now looking for injectors...ya'll help me.

 

Just ordered my K24 C/P..Now looking for injectors...ya'll help me.

http://store.clubrsx.com/merchant.m...erchant.mv?Screen=PROD&Product_Code=RC-650cc&Category_Code=ENFI&Product_Count=2

 

once you start passing 300WHP, a fuel pump upgrade is typically recommended. I have the walbro intank pump somewhere around my house waiting to be installed (again) once I decide I want to go with 11psi. I think I do, but I can't afford the upgraded MAP required right now.

How much does that run??

I plan on hitting 300 WHP with 9psi but if that doensn't do it then I'll go up to 11.

 

So with the 7psi pully and the K24 crank pully. What psi will it be?



Thanks




Kevin.

 

about 9ish. it's not really an exact number. and you will be overdriving your alternator and PS pump.

 

How much does that run??

I plan on hitting 300 WHP with 9psi but if that doensn't do it then I'll go up to 11.

It was $116 shipped on CRSX:

http://store.clubrsx.com/merchant.mv?Screen=PROD&Product_Code=HD-3BMS&Category_Code=

but it is out of stock. Basically I will need $200 to go to 11 psi since I already have the fuel pump. just need the K24 pulley and the MAP. But since I'm dead broke right now, even a small $200 is killer

 

Crap I ordered the 550cc's..Do you think that will be enought for 9PSI?

 

+ 1 on going bigger injectors 650 at least

 

Crap I ordered the 550cc's..Do you think that will be enought for 9PSI?

The issue with 550's and 9psi isn't that they 550s are big enough.. just that their spray pattern at a certain cam angle/ignion point/RPM ect. causes the car to go lean in some peoples car. I had the issue so I sold my 550's and went 650's. Dont regret it one bit either cuz now I can go to 11psi with no worries.

 

The issue with 550's and 9psi isn't that they 550s are big enough.. just that their spray pattern at a certain cam angle/ignion point/RPM ect. causes the car to go lean in some peoples car. I had the issue so I sold my 550's and went 650's. Dont regret it one bit either cuz now I can go to 11psi with no worries.

You can pretty much figure out boost for any pulley combination by using my pulley calculator and also the rule-of-thumb numbers I posted on top of this tread.

As for injectors, I feel it's time for an injector primer in a stickie somewhere. We usually go by hearsay and posted experiences. Fact is that there are lots of things to consider with injectors, and some have a direct influence on drivability and performance.

I've now extensively tested five different sets of injectors in my SC car, and each behaved a bit differently. I saw each set being run in Comptech's flow tester machine, and I studied their heads and jets carefully.

The spray difference in the flow tester is dramatic. Some injectors spray almost like a garden hose on full blast, all turbulent. Others are more like a hose set on very, very fine mist. You can direct them at a flower and the flower won't get hurt. This means excellent atomization. In my experience, that leads to somewhat better gas mileage and lower boost to get the same power (lowest possible boost to reach the same power is easiest on your motor).

In addition to all that are the fitment issues, the resistance issues, general operation issues (peak&hold vs. saturated) and the connector compatibility issues.

In direct answer to the 9psi question--the 550s are enough, but, as you pointed out, their spray pattern is suboptimal.

 

Word... the only issue I have with the 650's is doing hot starts sometimes. I'm running RC650's by the way... and was running RC-550's previously.

You can pretty much figure out boost for any pulley combination by using my pulley calculator and also the rule-of-thumb numbers I posted on top of this tread.

As for injectors, I feel it's time for an injector primer in a stickie somewhere. We usually go by hearsay and posted experiences. Fact is that there are lots of things to consider with injectors, and some have a direct influence on drivability and performance.

I've now extensively tested five different sets of injectors in my SC car, and each behaved a bit differently. I saw each set being run in Comptech's flow tester machine, and I studied their heads and jets carefully.

The spray difference in the flow tester is dramatic. Some injectors spray almost like a garden hose on full blast, all turbulent. Others are more like a hose set on very, very fine mist. You can direct them at a flower and the flower won't get hurt. This means excellent atomization. In my experience, that leads to somewhat better gas mileage and lower boost to get the same power (lowest possible boost to reach the same power is easiest on your motor).

In addition to all that are the fitment issues, the resistance issues, general operation issues (peak&hold vs. saturated) and the connector compatibility issues.

In direct answer to the 9psi question--the 550s are enough, but, as you pointed out, their spray pattern is suboptimal.

 

Word... the only issue I have with the 650's is doing hot starts sometimes. I'm running RC650's by the way... and was running RC-550's previously.

Trouble with hot starts? Will you explain please?

 

Trouble with hot starts? Will you explain please?

errr.. the car will struggle to start a bit. Kinda hard to explain.

 

When its hot outside? Or when your engine is warm?

 

When its hot outside? Or when your engine is warm?

When the engine is warm

 

Now when you use the k24 crank, I know you're spinning the accessories more. I wonder if it's possible to use the larger alternator pulley. I have a feeling the larger power steering pulley will hit the hood if you're using the jackson charger. The comptech charger seems to place the power steering pump lower than Jackson's. Conrad, is there any way you can compare yours with someone's with jackson?

 

Now when you use the k24 crank, I know you're spinning the accessories more. I wonder if it's possible to use the larger alternator pulley. I have a feeling the larger power steering pulley will hit the hood if you're using the jackson charger. The comptech charger seems to place the power steering pump lower than Jackson's. Conrad, is there any way you can compare yours with someone's with jackson?

You want to use smaller pullies

 

Why would you want to use smaller pullies on the power steering and the alternator when the crank pulley is driving them faster? You're gonna drive the accessories even more with smaller pullies.

 

yea jim....i think u need bigger.

yer increasing the diameter of the driving pulley so u need to increase the diameter of the accessory pulley to compensate....