RotaryMachineRx

iTrader: (1)

Yeah it's something I definitly would need to experience first hand and that is why I am going with the stock greddy first.... I've never even ridden or seen a turbo'd Rx-8 as there isnt any around here. Does it get a little bit annoying that boost drops off around 7k though?

I might be getting a little ahead of myself but what other upgrade options are there for the GReddy kit that can hold boost and flow to the engine all the way to redline? I already know about MM and BNR upgrades but MM no longer sells the turbos and BNR doesn't hold boost right to redline correct?

MazdaManiac

iTrader: (3)

It only drops off if you try to push the kit past what it was designed for, which is about 7 PSI.
If you leave it alone, there is no drop-off.

Its not that I don't sell/make them any more.
I just can't take any new orders until I catch up with the orders owed and I find a way to have the kits made in a cost-effective fashion.
As it stands now, I lose about $300 on the kit (I'm actually losing about $2k on each of the current, out-standing orders, but that is a totally different story).
By the time you get ready to upgrade, BHR will have a solution for your system.

The BNR, effectively, behaves almost identically to a stock GReddy turbo with regards to manifold pressure, but makes slightly more power.

RotaryMachineRx

iTrader: (1)

Okay THANKS alot MM and everyone else... appreciate the help... looking forward to seeing BHR's progression!!

Brettus

iTrader: (2)

The jury is still out on that . There were reports of someone dynoing at 332whp but the dyno never got posted - annoying .
What that person did to achieve that is still uncertain but i strongly suspect they followed my suggestion re wg arm adjustment.

All this aside , you may be very surprised just how damn quick a 280-300 car is . Adding an extra 50whp at the top end is not as noticeable (butt dyno wise) as you might think either .

WingleBeast

i lose no pressure with 8psi on stock greddy, I also still have the aux ports stock (or whatever jeff tuned them for)

Brettus

iTrader: (2)

If Jeff has the APVs closed (or the blocking plate in) then yes that would be possible on the stock Greddy .
You will still only make 260-270whp however .....

MazdaManiac

iTrader: (3)

No.
I only close the APV on my own system.
Sometimes.

RotaryMachineRx

iTrader: (1)

Yeah absolutely annoying haha... and are you reffering to shortening the actuator arm for the wg to make it open at a higher pressure?

I don't plan on using the blocking plate if thats what you are reffering to.

WingleBeast

i dont, not out of any objections but just because my kit didnt come with one, and I havent had any complaints

RotaryMachineRx

iTrader: (1)

Well that sounds better than I originally thought then, you get 8 psi till 9000.... thats pretty much exactly what I'm looking to start with.

Brettus

iTrader: (2)

if he gets 8psi to 9000 with a 6port engine on a stock greddy turbo i'll eat my hat .....

RotaryMachineRx

iTrader: (1)

Hahaha...... to good to be true

WingleBeast

I can tape it for you brettus? I know what I read before my install, and I have been presently surprised. I have no explanations for it other than a good tune and I am one of the few people running FI with a full 2400 degree ceramic coat on my manifold and down-pipe. Those are the only two things I can think of that I have going on different than most people. I won't get into the speculative on why it is, I am just glad it is.

Brettus

iTrader: (2)

I'm not saying it's impossible - just never been done before .
If your guage is reading correctly then you have achieved something no-one else has managed to do so better take it to the dyno

This is the best dyno for a stock Greddy that I've ever seen and he can only hold 6psi in the upper rpm range :

NgoRX8

iTrader: (1)

^that is very good for a stock greddy.

sometimes, you can't trust a boost gauge as it will not react fast enough to sudden changes. take it to the dyno

WingleBeast

next weekend ill check it out to see if my gauge is right or not

J.Cab

iTrader: (1)

https://www.rx8club.com/showpost.php...&postcount=508

yes it does...

RotaryMachineRx

iTrader: (1)

That's with the stock actuator... didn't mod it at all? you use Ap to tune it? Thats a decent looking graph.

gregs

iTrader: (7)

J. cab have you tried going higher boost levels, than that psi run? i know with the greddy turbo the lower boost levels tend to hold much better..my issue is being able to maintain higher boost levels..getting a desired peak is no issue (btw: how's the motor situation?)

Brettus

iTrader: (2)

Hi J.Cab , good to see you still around . do you still have your BNR ?

J.Cab

iTrader: (1)

yes with the stock actuator. with a better tune I dont see why 330whp+ at around 11-12 psi. I was using the AP to tune it. The day it dynoed it was a representation of what I believe the turbo was capable of like I mentioned. I know from my numbers(g/s) from the dyno and the numbers(g/s) from what I have gotten after that I have been at around 330whp.

J.Cab

iTrader: (1)

I still havent messed with my car. it has been sitting for the past couple of months. I dont know who to go to here in San Antonio to have my motor worked on that is good at working on rotaries. So I may need to call Charles. The most I have pushed the BNR was 13 psi and it held 11-12 psi to redline.

I guess I really havent been to much of a rush since I acquired a new and better DD with tons more power..

Brettus

iTrader: (2)

Impressive - is that after Kane tuned the BC ?


what do you have now ?

J.Cab

iTrader: (1)

yes after tuned the BC..it was holding that psi during the dyno when he was here.

a 700whp sedan

Brettus

iTrader: (2)

what sedan has that much power ?