Anyone road race a stock TII??
 

I am in the process of putting a TII in my FB road race car and will not be doing any mods except taking off the a/c, p/s pump and air pump. I will be running a 2 1/2" straight back pipe and relocating the intercooler out front.

Any suggestion of a simple engine management system to handle this......I'm a 50 year old carb generation guy :)

Any input or suggestions will be appreciated !!

Steve
racerguy19

The heat of the stock Turbo II is pretty impressive when road racing. We cooked a few stock turbos in our first Turbo II road race car. We were using a stock ECU with the fuel defender and 720 cc secondaries. we just couldn't keep the turbo cool.

Since then, ECU-wise I run a Microtech, but mine has come a long way from stock over the years. GT35R, 1680 secondaries, etc...
I've heard some happiness about the new Haltech stuff. But the low cost / high work option is likely the Megasquirt.
End of the day all the computers do is hold the solenoid (injector) open a determined period to supply fuel. pretty simple as a whole, everything else just modifies the amount of time open.

-Trent

Thanks Trent,

Do you run sprint races or endurance.....or both??? I run 20 min. sprint races at Mosport. I knew the turbos ran hot and was planning on venting the hood and bringing in some outside ducting for cooling.

We've run both sprint and endurance. I'd basically be worried about getting enough fuel for the car and the excessive restriction that the stock turbo is. The stock turbo has a tiny hotside and it really generates a great deal of resistance for the escaping exhaust. As soon as possible I'd suggest replacing the stock turbo with something much larger on the hotside.

That or get used to shifting the car early to keep from pushing that tiny turbo into a very inefficient zone of operation.

my $0.02
-Trent

If its worth anything, I am running MSII on my TII FB. I am going to try and start the engine this week and get it tuned.

Thanks again Trent, what type of fuel pump do you recommend to supply what the engine needs??
I'm also not looking for 300 - 350 hp right now, 220 or so would be fine. I'm just looking to run this engine to get used to the car and the new "power" over the stock 12a. I will do mods to the engine & turbo in the next off season.

Hey "nofords", let me know how that works out for you, I'd be real interested!!

Thanks guys !!

220hp? You can hit that with the stock IC and turbo no problem. My S5 T2 makes 213 at the wheels with a street port, light flywheel, and a microtech ECU, with only 8lbs of boost. The WG actuator it hooked right to vacuum line with no boost controller so it just opens at its natural pressure. It does start to choke real bad above 6000 rpm though.

I also have a walbro pump and 1600 secondary injectors, the motor was really built up for making a lot more power but all I use the car for is HPDE and street, so I never ended up needing more. All more power gets you in HPDE is more expenses as you chew up tires, brakes, and gas faster.

What class and organization are you going to be racing this car in? If I had it to do over I wouldn't have gone with a turbo rotary for this kind of thing. Non-turbos can be supremely reliable but turbos introduce all kinds of problems.

Hi Gene,

I will be running this car in the GT Sprint series at Mosport International Raceway (it's north east of Toronto). The series is bracket racing, so you can have any car with any mods, it's all classed as how fast you go around the track. GT1 being the fastest and GT6 the slowest .

The car I have is an 81 RX7 with an 85 GSL SE brakes and hubs. it came with a stock 12a and a Sterling nikki set up for IT7 racing in Florida. In order for me to bport the engine and replace the intake and carb to supply enough fuel, it would have cost me approx. $2000 cdn. That would have given me about 170 hp?? I bought the complete TII for $600 and it should do almost 200hp with the FMIC, a 2 1/2" straight back exhaust, no a/c, no p/s and the air pump removed.

I figured it was a good way to go for the money.

Over the years I've been through a few engines... :)

I'd get an adjustable fuel pressure regulator and run the walbro 255 pump (cheap, but adequate) . If things are getting a little lean you can just bump up the pressure. Might make the idle a little ugly, but it should hold it together.

-Trent

I have done HPDE events, 20-30 min sessions on mine for a number of years now. I run a stock turbo, street port, stock IC, 750 secondaries, full RB turbo back exh, SAFC and a Redom ECU. My car dynojets at about 245 to the rear wheels. It is a pineapple motor with stage 3 oil mods. It has never given me trouble.

The best advice i have for you is find a way to do a v-mount setup or something else to avoid a front mount intercooler in front of your oil and water cooling. You want lots of unobstructed flow to large oil cooler(s). Having great oil cooling is the key to keeping a turbo rotary alive on the track. On mine i run the stock oil cooler but i bought a new one from mazda. I run it in the stock location and chose to keep the stock intercooler because running a front mount in front of the radiator and oil cooler is completely insane for road racing. You want a big radiator too with good ducting.

People get down on the stock TII intercooler. I think it is fine for anything up to 250 rear wheel HP. It is a great location as it gets plenty of air. For road racers it never heat soaks because it always has positive air flow.

Well, since you have a FB, you can easily fit a Ituzu intercooler above the oil cooler where it does not impede the flow (my current setup).

On my GSL-SE, I'm running a MS ECU, a 944 turbo fuel pump (my Walbros kept failing), 750cc primaries and 1600 secondaries. I never medded with the stock turbo though. I had a modified stage four, but I was having too many issues with it so I went with a T04 which puts down about 350 with a conservative tune.

This is all great guys Thanks !!! I've been busy with a new cage and other stuff.....it never ends!!

I have the TII stripprd of the "rats nest" do any of you have a diagram or can you tell me what I have to have in the way of vac lines etc. to make the engine run??

Also, the Walbro is an in-tank pump and I have a fuel cell with foam so my pump has to be external.......suggestions ???

Thanks again everyone for you help !!

I'll get some pics of the car up soon.....anyone of you have pics of your racers???

Fuel injection pick up from a fuel cell is a tough problem. I just recently bought an in-tank 3 window surge from ATL (makes of my cell). It was $300. Previously I ran two duckfoot pickups in the corners of the tank, feeding two "lift" pumps which fed into an external surge tank which then fed the Aeromotive Tsunami pump. Easiest by far is to buy the in tank surge. The external is a lot of extra plumbing.

-Trent

The external surge also defeats half the safety benefit of having the cell in the first place, and it's just more stuff to go wrong and cost you a race.

That is fantastic. I am going to reengineer my fuel system over this next winter and i was planning an external surge tank with the stock tank. I think now ill rip all that stuff out and put in a fuel cell with an internal surge tank...

Psst

http://www.fuelsafe.com/Page%2026.html