if the ic were restricting flow that much i would have
thought that the turbo side pressure would have gone much higher with the waste gate disabled.

matt

 

hmm good point. well maybe at 5-6k rpms they cant make anymore than that?

mike

 

i hope you meant 320-350HP...not 220-250HP ? the stock FD's are 255HP...... even if you meant 300's it is still not much better than a modded FD... haha we need more boost people...otherwise the 20b is not worth it!!! oh, by the way does anyone have an idea of what a really rough HP estimate would be if we could actually get 15-16psi on a stock motor (assuming we deal with the lack of fuel)? thakns

hey matt, that was my other question... with the modded RE Amemiya computer that your running how would you deal with delivering the extra fuel to support 16psi? wouldnt you have to increase injector size? and how would the coputer be able to deal with that?

 

Hey I did a test of the my smic & piping today to see how efficient they are. You might want to check it and hook up your boost gauges the way I did. This should really let you know how efficent your piping & intercooler really is.


https://www.rx7club.com/showthread.p...hreadid=236643

 

the RE Amemiya computer is setup for the most boost
that the stock injectors will allow, nothing else needs to
be done with a stock cosmo other than open 3" exhaust
and intake.

matt

 

i did the same thing as you but i didn't have to drill
any holes
you said that the stock ic and piping sucks,,, a
3 psi loss in the ic and pipes is what i would call really
good, you would be hard pressed to find better.
The worst that i seen with my setup on the 20b was a
total loss of 7 psi at 7500 rpm!

matt

 

it did 220rwhp a year ago with the e6k, i actually do have a dyno sheet for 139rwhp@12psi with a 20b. its faster now, and runs a lot better. at this point i'm just happy to have it running well enough to be a daily driver. it does need to go to the dyno for final tuning but i'm not super concerned with the # it puts down.

mike

 

Damn 7psi loss Do you have any pics of your setup?



Hey Mike, That dyno run of the 139 rwhp at 12psi on a 20b. Did you have really low compression or something at the time?

 

I am using a Porsche intercooler and i think the big loss
problem might be there, the end tanks really suck on it
i think i am going to cut them off and put 4 inch pipes
on it and see what it does

matt

 

would that really help that much? i have a feeling its mostly piping and the internal structure of the intercooler. let me know how it turns out though. how big is the IC? got any pictures?

 

the timing map was way off, the haltech is gay about changing map sensors =)

mike, sorry i guess i'm steve right now

 

here is a couple pics of the pos Porsche intercooler

 

here you can see how poor the end tanks are on the
Porsche intercooler

 

I'd be happy to test the ecu in my Cosmo, if you don't mind sending it to New Zealand. With my electronics background, I may even be able to duplicate what RE-Amemiya has done to it by looking at it alongside my stock ecu.

Gary

 

Idiot.

Steve

 

rotaspec: there must be a good deal of modifications done to the ecu.... they would have had to add maps for the higher boost levels... im sure it would be quite an intricate project. on that note, i and im sure other people would buy one if you are able to duplicate what RE Amemiya did. i wonder if anyone or any companies in new zeland or australia have done a mod like this to the stock ecu. *think about it guys... this would be a perfect solution (assuming the turbos were modded to support 16psi)*... all you would need to do a conversion would be the modded ecu, modded turbos, engine w/ electronics/wiring harness, flywheel, large intercooler, and some way to mount it (pettit sells the FD subframe). am i forgetting anything.... this would be almost bordering on bolt on 20b (or as close to bolt on as one could get). most of the guess work/fab work would be eliminated, and if you could actually push 16psi, you would have one serious rx7. we know the turbos can be modded for that psi (although im still researching the best way to do it).... really the last piece of the puzzle is the ECU. i emailed RE Amemiya but they never got back to me........ so the question is..... is there anyone out there that has the resources to tackle this? if so count me in. heath

 

to bad i didn't know about you before it was sent back
here from kiwi-re.
and its not a simple mod there is way more to it than
just reading a chip, they even made a point of grinding
off one of the chips id numbers.

matt

 

its nice and thick, but its kinda small, no?

mike

 

it sure cools I don't know the exact numbers
but i know that after some hard boosting i cant touch the turbo
side and the other side is just warm.

matt

 

cool, but i still wonder about the flow

mike

 

well did a little more playing around with the car tonight
all i can say is its cooooooooold out side
-16C to be exact, a little to cold to be testing but that
didn't stop me,,, i bypassed the ic and put in a straight pipe,
got much better response, and only a 1 lb loss
between the turbo side and the intake, guess the throttle
body might need a little work in the future.

so it was hitting 10lbs of boost on the intake side at
low rpm and once it got up to higher revs it dropped
to 8 psi to 7500 rpm pulls much harder.
next will be to try it with the waste gate clamped
and see if i can hit fuel cut with the stock computer
i was told that it should cut at 10 psi hasn't happened
yet, and the air fuel ratio stays rich all the way up.

was starting to notice a miss at 7000 rpm not sure
what's up with that.. bad plugs maybe. all went well
until the bypass pipe i was using got a nice cut, guess
it was a little to close to the p/s belt

later
matt

 

im tellin ya, if you want more boost the stockers have to be modified

that being said, let me thank you again for all the testing you are doing, and to help untangle a few of the mysteries that we are all struggling with on the 20b's! you are a great resource to the 20b forum... keep up the good work! heath

 

Did you notice a huge differance in intake temps after bypassing the intercooler?

 

lol it was -16C out side both the turbo side and intake
side were quite cold not to mention the nut holding
the steering wheel

matt

 

I ran the stock twins on my 20B in parallel. I was not using the stock ECU, but a MIcroTech LTX-12, without a boost controller I hit 21psi of boost out of the stock "unmodified" factory twins. It was crazy with that kind of boost! the car would break the tires loose in 4th gear! Don't know if that helps or not. I just thought it was curious that people would say that they can't produce more than 10 psi. Pettit runs his 20B twins in parallel and not sequentially. All I can say is that my 20B runs allot better now with the single T-66 and a mild streetport. :-)