Did search but its still not clear to me,some people say they're the same others say they're not? has anyone ever done any testing?or even with Toda ones?
Like to know if I can rev safely up to 9200 RPM's and save $500.00 thanks!

 

same

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hybrid ctr &raquo;</TD></TR><TR><TD CLASS="quote">same</TD></TR></TABLE>

I've heard this as well, but would wait for others to chime in. EPGONZALEZ posted once that he had ordered these and compared them to OEM springs, and couldn't find any difference. Kinda shady for Mugen to just rebox and sell the springs under their name imo.

 

I've read somwhere that they are same as well, but that just doesn't make sense, or like someone else said, that's extremely shady on Mugens behalf. I'd really like to know the anwser to this question as well.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by natadekoko &raquo;</TD></TR><TR><TD CLASS="quote">

I've heard this as well, but would wait for others to chime in. EPGONZALEZ posted once that he had ordered these and compared them to OEM springs, and couldn't find any difference. Kinda shady for Mugen to just rebox and sell the springs under their name imo. </TD></TR></TABLE>

You mean shady like what Spoon does with the ITR tranny, or the ITR pistons?

 

Mugen never dishonestly marketed their springs.

The upgraded springs they sell are for increased rev limit when using their ECU, for 96 or older models.

The 98 spec came with the new "upgraded" springs, thus EPGONZALEZ's matching test results. KING just never updated that info on their website to reflect this improvement.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris &raquo;</TD></TR><TR><TD CLASS="quote">Mugen never dishonestly marketed their springs.

The upgraded springs they sell are for increased rev limit when using their ECU, for 96 or older models.

The 98 spec came with the new "upgraded" springs, thus EPGONZALEZ's matching test results. KING just never updated that info on their website to reflect this improvement.
</TD></TR></TABLE>

I believe the springs were designed for the pre-98spec JDM ITR, which would mean '97 or older models. I'm not sure if the '97 USDM ITR comes with the "upgraded" springs or not...?

Like Chris said, there isn't anything shady going on, just a miscommunication (which happens pretty often when translating long paragraphs from one language to another).

 

So then the OEM valvesprings in my 2000 ITR are the same as the Mugen valvesprings and could be used with the Mugen ECU and reved to 9,100 RPM without any problems? Not that I would get the Mugen ECU, but I just wanted to confirm this information. Thanks again.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ITR420 &raquo;</TD></TR><TR><TD CLASS="quote">So then the OEM valvesprings in my 2000 ITR are the same as the Mugen valvesprings and could be used with the Mugen ECU and reved to 9,100 RPM without any problems? Not that I would get the Mugen ECU, but I just wanted to confirm this information. Thanks again.</TD></TR></TABLE>

Yes, that is true.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ITR420 &raquo;</TD></TR><TR><TD CLASS="quote">So then the OEM valvesprings in my 2000 ITR are the same as the Mugen valvesprings and could be used with the Mugen ECU and reved to 9,100 RPM without any problems? Not that I would get the Mugen ECU, but I just wanted to confirm this information. Thanks again.</TD></TR></TABLE>

This is true. I have a Mugen ECU on a 2000 ITR and have had no issues. I believe EP suggested to run Portflow "inner" springs to be on the safe side, but I'm NOT sure.

 

Time ago I asked the same question to King and the answer i got sayed that Mugen springs have same like stock pressure (145 lb/sq. inch) but ramp at a different rate for less drag.
And I have Mugen ecu with stock springs running 9100 rpm daily without any issue.

 

OT Kinda, but I just put a Kenji P28 with 9500 fuel cut-off. Not that I plan on revving that high, but are you guys saying our stock valvetrain could handle 9000 rpms? Valves and all? Just curious. If so, I'd like to play with my cam timing and see if I can get any power to be made after 8400.

 

Stock springs can handle 9200-9300 rpm (not consistently) but remember that you'll have valve float over 8600 rpm.
Do not loose your time, you'll not get any power over 8400 rpm playing with cam gears on stock cams.

 

So the valve spring rates are the same,any weight/material differences?
I can understand using high lift cams needing stiffer springs and all,but Im just trying to justify Mugens claim of springs needed,anyways I was wondering also when you use stiffer valve springs on race cams does it rob you of some power or does it just put more strain on your timing belt?thanks ya'll