I hate my RPM throttle body
#1
I hate my RPM throttle body
I’ve always read aftermarket throttle bodies suck but I didn’t believe it until I bought one. I have a 76/78mm throttle body from RPM services and I need help.
Problem 1.) When opening the throttle from closed to slightly open I can feel it catch like the throttle plate is slightly too big for the bore. I thought this would wear down after a few hundred miles but it hasn’t. One day I lubed the edges of the throttle plate which made it open silky smooth but of course that didn’t last long.
Problem 2.) It sticks! I have adjusted my throttle cable so it has slack in it. I have adjusted the bolt that limits the pulley movement. I can fully close the throttle by forcing the pulley with my hand. But as soon as I blip the throttle it will never fully close again which means I’m idling at 2k all the time.
These drivability issues are driving me insane. I am considering downgrading to a bored ITR throttle body and just taking the HP hit for better drivability. Any suggestions? Should I switch brands? Go back to OEM?
Problem 1.) When opening the throttle from closed to slightly open I can feel it catch like the throttle plate is slightly too big for the bore. I thought this would wear down after a few hundred miles but it hasn’t. One day I lubed the edges of the throttle plate which made it open silky smooth but of course that didn’t last long.
Problem 2.) It sticks! I have adjusted my throttle cable so it has slack in it. I have adjusted the bolt that limits the pulley movement. I can fully close the throttle by forcing the pulley with my hand. But as soon as I blip the throttle it will never fully close again which means I’m idling at 2k all the time.
These drivability issues are driving me insane. I am considering downgrading to a bored ITR throttle body and just taking the HP hit for better drivability. Any suggestions? Should I switch brands? Go back to OEM?
#4
Re: I hate my RPM throttle body
Once you bore a stock TB you end up with a new plate anyway so that doesn't make much sense that the stock casting will somehow help.
I'd mod the throttle plate... smooth the contact edges to a slight taper to match the angle it meets the casting...
How much HP do you think you'd lose by going back to stock? I can't imagine it's much.
I'd mod the throttle plate... smooth the contact edges to a slight taper to match the angle it meets the casting...
How much HP do you think you'd lose by going back to stock? I can't imagine it's much.
#6
iTrader: (2)
Re: I hate my RPM throttle body
I have tuned enough cars where the IACV no longer works with aftermarket throttle bodies, and it can make things a pita when using it with a stock ecu based system.
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#13
Re: I hate my RPM throttle body
Originally Posted by NonovUrbizniz
Once you bore a stock TB you end up with a new plate anyway so that doesn't make much sense that the stock casting will somehow help.
Originally Posted by NonovUrbizniz
I'd mod the throttle plate... smooth the contact edges to a slight taper to match the angle it meets the casting.
Originally Posted by NonovUrbizniz
How much HP do you think you'd lose by going back to stock? I can't imagine it's much.
How do I contact RPM Services? I want to ask them what I should do. I cant find a phone number or website.
#14
Honda-Tech Member
#16
Honda-Tech Member
Re: I hate my RPM throttle body
70mm RPM throttle body here
it works great... it use to stick but after cleaning it and soaking the spring it has been perfectly fine....
you could send it to maxbore.com and have it cleaned up with a new throttle plate
it works great... it use to stick but after cleaning it and soaking the spring it has been perfectly fine....
you could send it to maxbore.com and have it cleaned up with a new throttle plate
#18
Re: I hate my RPM throttle body
The Professional Products have always seemed good, and the Omni's as well.
Same casting as the Omni, with a taper bore from 74mm down to 70mm (69mm really)...I have had customers have great luck with these:
http://www.xenocron.com/throttle-body-74mm-p-374.html
I honestly dont know if you would loose any power going down to a 68mm or equivalent though...maybe a LITTLE throttle response, but like you said...traction is a bitch
#19
Re: I hate my RPM throttle body
To be honest I think 78mm is too big now. Sure I have great throttle response but at the cost of throttle modulation. Once I spool I can maintain full boost with only 50% throttle. I can't modulate it with the throttle. Like I said I hate my throttle body.
#20
Honda-Tech Member
#21
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Re: I hate my RPM throttle body
The throttle plate is obviously touching the throttle bore so i would adjust the throttle stop ever so slightly to get it from resting on the bore.
#22
Honda-Tech Member
Re: I hate my RPM throttle body
have a customer with one of these and its a PITA too..... dont think ive ever used a throttlebody that sucked as much as the skunk2's.
ironically, the blox throttlebodys seem to work really well
ironically, the blox throttlebodys seem to work really well