markryan22

iTrader: (1)

This Thread is about the next stage of my RX8 and to get opinions from my fellow 8 owners . This post will be updated should there be any changes.

RX8: 2004 AT Greddy Turbo (See full modifications here)

Reason:
1. Poor performance in Fuel Injectors and Fuel Pump during the DYNO tune.
2. Cooling was horrible due to 1 Oil Cooler and lack of CAI.
3. Jeff only got it to get to 183 HP, 172 TRQ)

Fixes:
1. Additional oil cooler
2. Better radiator
3. Upgrade fuel pump
4. Upgrade fuel injectors

Current Status:

8-31-2010 I had KDR install a heat wrap/shield under RP Mid Pipe do to excess heat. During the DYNO water temperatures were reading almost 226+ for one pull and returning home I found out my transmission wires were starting to melt.

Note: KDR, or KD Rotary Performance is now called Speed 1.


Engine Bay Currently:



Current Add-Ons Coming:
- Razor ViS Carbon Fiber Hood

Engine Option 1 – Better (Cheap)
1. Koyo Cooling Radiator $160
2. Walbro Performance Fuel Pump $100
3. Oil Cooler, Possibly OEM else another brand.
4. Upgraded Fuel Injectors ??? Any thoughts of which one to add to a 4 Port AT??

Engine Option 2 – Besterest (Costly)
BHR Ignition System $480
BHR Fuel Pump $460
BHR Radiator $660
AEM CAI
Upgraded Fuel Injectors (See Option 1)
Battery Relocated to Trunk
Oil Catch Can moved next to window washer fluid.
Intercooler mounted where battery

Brettus

iTrader: (2)

Before you break the bank how about a little more time spent on diagnoses ...
Are you sure the install is 100% ?
What boost did you see at whp peak ?
How do you know you had poor performance from pump and injectors ?
The stock pump will handle almost double the whp output you made - unless the AT has a different pump to the MT ?

What size are the stock injectors on an AT ? 280/480 would take you to 200whp ish. so I don't think your injectors were a limiting factor.

Still say add another water rad where the 2nd oil cooler would go .

Posting up your dyno would help ...

markryan22

iTrader: (1)

Pretty sure about the injectors, the pump might just be added to help the load. When Jeff was tuning 183HP/172TOR was the max he could get out of it. He said about the stock injectors could be off by 15% and since it's a 4 port, just one not going to par would hurt.

Cooling on the other hand my water temps have been hitting any where from 200-236, which on the dyno started melting the plastic harnesses that connect to the transmission.... not good.

gregs

iTrader: (7)

insulate/wrap the transmission lines, is that RP midpipe equipped with a cat? I would steer away from the koyo radiator there isn't too much positive feedback on that radiator..either add a secondary radiator like brettus mentioned or look into the BHR radiator...what coolant water mixture are you running?

ronx8

Remember that the OEM AT radiator comes doubled with a tranny cooler.

The only aftermarket radiator with a tranny cooler is BHR.

Brettus

iTrader: (2)

OK -
*fit the pump
*upgrade the secondary injectors
*fit a 2nd water rad - as ronx8 mentioned the stock rad has to cool the tranny as well so a 2nd unobstructed one would be very effective. Just make sure it sees airflow at the dyno or you will be worse off than you are now.
*try again

My gut feeling is that you won't make any more power beacause there will be another issue that you have not found yet . But at least you have the capacity to go higher .

markryan22

iTrader: (1)

KDR did a heat sheild but that's a good point to wrap them. I should just wrap the pipe down. Yeah I've read some reviews that haven't done to much to keep the car cooler then stock...

Coolant water mix = none. I was thinking of trying a AEM Water / Methanol Injection Kit, just wish it wasn't $400.


I didn't think about the tranny cooler. Would be a huge plus.



I'll prob do the injectors and the pump day before the dyno run just incase. Rather have jeff there to tweak before I road test. Maybe I should change out spark plugs too since i have no clue if/when they were switched when the first motor blew.

09Factor

Why don't you heat wrap the midpipe. I did and never have scorched my wires.
And my cabin floor/Drive shaft Tunnel is cooler afterward.

Here are my .02 worth.

1. The OEM fuel pump loves to ever heat and drop off in flow and pressure.
Replace it with a Walbro. Or like you have above replace the entire unit.

2. Fuel Injectors: Really have two options to choose.
a. Send the stockers to KG parts. Pay $80 or so buck to upflow the 480's to 8xx plus and have the 280's cleaned and flow matched.
b. OR replace the Secondaries with two 1000cc. I Recommend Injector Dynamics

3. upgrade the Single Oil cooler to a 19 row. Install an second H2O cooler where the second oil cooler would go.

4. BHR AT rad works great for shedding heat. Work better with the Mazmart T-Stat

5. Get rid of that POS Greedy HAI. I was seeing 197+ degree IAT's. That right there will eat your power.

6. The BHR Ign replacement is da shiznit. Really it is. I know the stock coils won't light off 14 month old gas.


Nope it's the same.

Not really but it starts getting close the 80% duty cycle.

+1 !

markryan22

iTrader: (1)

I'm going to see about getting that done this week.

1. I'm order one of the Walbro's tomorrow if Dave can install it himself at his shop.

2. Injectors: Best bet would be the ones for the RX7 correct?

3. I seen some of those oil cooler ebay for like $65, curious if thats for crap one, or a viable option.

4. Pricey but I think it might be a good add-on, deff if I upgrade the turbo like your thread

5. I was going to get a AEM CAI, but curious if I could just build one myself.

6. I do have a Esmeril Racing RX-8 Ignition Upgrade, hopefully it's similar to the BHR

Brettus

iTrader: (2)

Definately you could - you just need a tube made up to suit the maf to the right dimensions - preferably one with a bend on the end to match the greddy pipe that goes to the turbo inlet , some couplers and a filter .
I don't even use screens ...

markryan22

iTrader: (1)

I'll have to try it out, i had a AEM CAI but sold it when I installed the turbo thinking the racing sponge would been better... and I was wrong lol

freaklinkmusic

what psi you running @ the manifold? if you're running about 6psi then those are almost the best numbers you'll see with that turbo with the 4port a/t. you gain maybe 7-10 hp with better cooling the the cai.

ShellDude

iTrader: (12)

The only plus about the AEM kit itself is the MAF tube and the sock. Should be easy to source the sock.

Dave fabricated a couple pipes for me when he did my install and "fitted" an AEM CAI on. If he's comfortable replicating the mount for the MAF it'll probably be a little cheaper in the long run to have him do it. You end up with a couple left over pipes (and likely a little bit of cutting) with the AEM too.