green and red are type R manifold blue is edelbrock manifold

time slip comparison


left slip is with green dyno run, right slip is blue dyno run
last time out i hade the red dyno run and i broke my clutch, i should have left it alone.

 

holy crap that's a huge loss in power, what did you use to tune the car with the new manifold?

 

i tune the car with a apex safc both times.

 

What comp ratio? is the engine
we have had really good luck with the JG mani

 

its a ls crank with pr3 pistons, type R head, i think the compression is around 11.3 as per c-speedracing compression calculator, but im not sure.

 

That would be your problem
need about 12.5 with tht mani
Our engine still makes power@ 10k still going up with that mani

How much does yur car weigh fast car for stock parts

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MAX_CFM &raquo;</TD></TR><TR><TD CLASS="quote">What comp ratio? is the engine
we have had really good luck with the JG mani</TD></TR></TABLE>
he's definatly not spinning the motor like you do, Brad

 

i dont know what it weighs, unfortunatly i havent been able to make it to the scales in the past two events, first clutch, now oil pump.

its not a street car, its dedicated race car and im guessing the weight is around 1800lb with me.

 

what cams are you running ??
im still debating if to stay with the ITR or go with the JG

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MAX_CFM &raquo;</TD></TR><TR><TD CLASS="quote">
Our engine still makes power@ 10k still going up with that mani
</TD></TR></TABLE>

Is that the blue all motor Si u posted a vid of?

 

that low of compression of course the type r will come on top you need higher comp and higher rev limit. 11.3comp isnt high enough for the JG. run higher compression you will see the difference.

 

yeah anywhere cr wise of 13-14:1, a good profile cam to make that manifold work, and a good tuning tool
an afc is too blunt of a tuning tool

plenum volume is your freind

 

im going to keep the edelbrock manifold. but for now im going to use the type R, since my motor is not ready to use the edlebrock yet. i guess i need more compression, my 11.3:1 is not enoguh, i also dont have enough cash to do anything about it.

i wonder how those will do once i get the compression up also?


Modified by shant at 12:44 AM 8/7/2004

 

how about 12.8CR and Toda spec D's ??

 

My torque went from 165+ to 140 with the JG manifold.
I did gain hp from 9500-10500 but i dont think it was worth the torque loss from 3000-8000.

Ive seen similar results on a couple of other motors as well.

 

Top post, Shant

 

That Jg manifold is better suited for boost. That has always been the rumor, and now heres your proof.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sgT &raquo;</TD></TR><TR><TD CLASS="quote">My torque went from 165+ to 140 with the JG manifold.
I did gain hp from 9500-10500 but i dont think it was worth the torque loss from 3000-8000.

Ive seen similar results on a couple of other motors as well.
</TD></TR></TABLE>

Yea I guess it all depends what application
we leave @ 8k and the motor doesnt see under 8k but for a split sec
I think a track test should be done on a car with hi compression too

 

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

Yea I guess it all depends what application
we leave @ 8k and the motor doesnt see under 8k but for a split sec
I think a track test should be done on a car with hi compression too</TD></TR></TABLE>

true , i know some race cars run the IM but is it worth it for a N/A set up for the street . i really seeing that is not . and even for auto cross .. i guess itr it is , not worth it loosing TQ just to gain a bit on the top end

 

Do you have a plot with the A/F ratios for the runs?

Austin

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MAX_CFM &raquo;</TD></TR><TR><TD CLASS="quote">What comp ratio? is the engine
we have had really good luck with the JG mani</TD></TR></TABLE>

So have we. We lost power using the stock JG piece at first, then the port tool came out and we gained power over the Skunk2.

 

I haven't seen any impressive numbers out of the jg, it seems to lose all it's low end and just make power between 7000-11000 rpm. And make disapointing results. The type r manifold with a mild port I have seen make more respective numbers.

 

whatta huge lost.

 

up..any dynos with 12.0cr and above with the jg?

 

When I went from the jdm itr manifold to the jg manifold I lost hp all over the place. But after 2 hours on the dyno I ended up with about 8 more hp on the big end and about the same tq numbers.
15:1 ls/vtec deckplate motor (RS motorworks)