Roadracing7

iTrader: (2)

I have searched and searched and searched and would like someone to be kind enough to offer personal answers and advise.

I have a stock motor, FMIC, 3" exhaust, Power FC, Cosmo pump and want to go single @ 15psi. I was looking at the XS T04E or T04S kit.

Would I get enough of a gain out of the S with a non-ported motor to spend the extra $$?

What size injectors would you recommend? 1300 or 1600 with a custom rail?

Other than the injectors and turbo/IC pipe, what else do I need to budget into the project?

Estimates on hp? (I would love to be around 400)

Would you recommend another turbo for comparable $$?

Thanks for the replies in advance, it's not fun watching your own thread move to the bottom of the screen with 0 replies, and please don't refer me to another thread to read as I've lost enough hours of sleep already...

Roadracing7

iTrader: (2)

Very helpful

jeff48

Lot's of questions. few answers.

1. Engine condition. It is a complete waste of money to upgrade to a high output single unless you have a motor that is solid. How many miles on the motor? What are the compression numbers. Are you willing to risk $5-6K minimum of new and upgraded parts on a weak engine---I speak from experience because the car I bought had $12K of upgrades on a really sad mazda reman, 3 weeks later and before I got a chance to get a replacement engine, the reman grenaded at 6000 rpm while passing a truck at 70 mph with only 12 pounds of boost (which was regulated by a Profec-B, AND pop-off valve backup at 15 psi). Now I have had to replace a $2300.00 Ball bearing turbo (which had less than 1000 miles on it).

2. you have a 3" exhaust...dp? midpipe? catback? what?

3. Do you want to retain your cat and airpump?

4. What about emissions testing problems

5. You looking for a daily driver or a streetable Solo II competitor?

6. Fuel delivery with the Cosmo pump may be adequate with up to 1300cc at 15 psi. but you almost won't know for sure until you try and replacing it is the least of your worries.

7. Porting will do nothing for your low end, but will reap big rewards at the upper RPMs

8. Boost management is a must

9. Pop-off valve (not Blow Off Valve) is a $100 insurance policy you can't afford to be without

10. Stand Alone Engine Management

Yadda Yadda Yadda

Try also looking at the advice given in the other thread here entitled "Singel turbo setup". Max is on the money!!!

Specific Questions will receive more specific answers

osdesigns

south carolina... no smog to worry about... how nice

a ported motor sometimes helps to lower the exhaust gas temperature, and improve the scanvage effect. The low end could have a slight power loss due to the overlap. However there are lots of advatage will make up for the rough low end.

1FooknTiteFD

The GT3540...both that and the T04s should put you at about 400rwhp no problem. The most important thing you are overlooking is tuning. Where are you going to get your Power FC tuned? since you are cross country, how are you going to get it tuned so that you can extract more power from your car? Only XS has the power excel software and can dyno tune your power fc, so maybe you shoudl consider switching to haltech or electromotive

nocab72

Badog can tune it here in Ohio. We are in the process of tuning my GT35/40 setup as well as Jason's T78. We have all the capabilities to tune your PowerFC. Datalogit, logging, Wideband, basemaps, etc.

If you purchase your parts though the RX7 Store they (we) can also do the install for you.

SC to Columbus, OH is what, 6 hours?

K

Roadracing7

iTrader: (2)

Thank you for the advise and offers! I consider myself rather knowledgable about the car when it comes to stock setup as well as tuned setup with the only exception being a switch to single turbo. I am fairly certain I can handle the install myself as I can do an engine swap (remove, tear down to short block, build new short block, reinstall) in 20 hours in my driveway as the first time.

As far as the PFC tuning and specific parts, I am having to rely on other people's experiences (success and failure). I am confident that I know the bulk of the parts I will need for the conversion while knowing I'll find out I forgot something minor when actually changing everything out.

The only concern I still have is the Power FC. It took me 9 hours from Columbia, SC to Mid-Ohio for the ALMS/F2000 weekend, so Columbus is a pretty big trip. I have tuned 25 hp into my current setup from just fuel alone since installing the parts. When it comes to ignition and modifying the base maps for fuel and ignition, I consider that too expensive of a field to tamper with and would rather leave it to someone else's experience.

I will have the Datalogit and access to a dyno with wideband in the next couple weeks and am curious how difficult it is to safely increase hp in tuning on a single turbo setup say from modifying the maps here on the forum? If it's not for the hardcore-build-and-port-their-own-motors kind of mechanic only, then I would think it's something I could be confident enough to try on my own, of course with help from you guys!

Thanks again!
Richard

nocab72

Richard - sounds like you have all the tools you need! AFR tuning is simple with a WB & Datalogit as you already know.

Timing tuning is a black art, one that we are certainly no where near mastering here.

Here are two VERY good threads on timing & split to get you started:

https://www.rx7club.com/forum/showth...hreadid=101226
https://www.rx7club.com/forum/showth...hreadid=103833

Once you get your datalogit and are on the yahoo forums group, there is a good starter map in the files section for the TO4 series or a GT35/40 -- to4exs.dat I believe is the name. Timing is good for a stock motor and you should find it very rich (safe) to begin working from. The map I'm currently using was based on that one. I'm not saying it won't blow up your engine, I'm saying it didn't blow up mine yet.

K